Basler Electric BE1-51 User Manual

INSTRUCTION MANUA L

FOR

BE1-51

Time Overcurrent Relay

Publication: 9137200997
Revision: G Mar-15

9137200997 Rev G i

Caution

Note

Preface

This instruction manual provides information about the installation and operatio n of the BE1-51 Time
Overcurrent Relay. To accomplish this, the following information is provided:

• General information

• Controls and indicators

• Functional description

• Installation

• Tests and adjustments

• Specifications

Conventions Used in this Ma nua l

Important safety and procedural information is emphasized and presented in this manual through
warning, caution, and note boxes. Each type is illustrated and defined as follows.

Warning!

Warning boxes call attention to conditions or actions that may cause
personal injury or death.

Caution boxes call attention to operating conditions that may lead to
equipment or property damage.

Note boxes emphasize important information pertaining to installation
or operation.

BE1-51 Preface

ii 9137200997 Rev G

Basler Electric does not assume any responsibility to compliance or noncompliance with national code, local code,
For terms of service relating to this product and software, see the Commercial Terms of Products and Services

document available at www.basler.com/terms.

This publication contains confidential information of Basler Electric Company, an Illinois corporation. It is loaned for

and options are subject to modification without notice. Over time, improvements and revisions may be made to this
manual.

The English-language version of this manual serves as the only approved manual version.

12570 State Route 143

Highland IL 62249-1074 USA

www.basler.com

[e-mail]

Tel: [phone]

Fax: [phone]

© 2015 by Basler Electric

All rights reserved

First printing: July 1992

Warning!

READ THIS MANUAL. Read this manual before installing, operating, or maintaining the BE1-51. Note

all warnings, cautions, and notes in this manual as well as on the product. Keep this manual with the
product for reference. Only qualified personnel should install, operate, or service this system. Failure to
follow warning and cautionary labels may result in personal injury or property damage. Exercise
caution at all times.

or any other applicable code. This manual serves as reference material that must be well understood prior to
installation, operation, or maintenance.

confidential use, subject to return on request, and with the mutual und er st and ing that it will not be used in any
manner detrimental to the interests of Basler Electric Company and used strictly for the purpose intended.

It is not the intention of this manual to cover all details and variations in equipment, nor does this manual provide
data for every possible contingency regarding installation or operation. The availability and design of all features

publication. Before performing any of the following procedures, contact Basler Electric for the latest revision of this

Preface BE1-51

9137200997 Rev G iii

Contents

Introduction ................................................................................................................................................. 1

Standard Features ..................................................................................................................................... 1

Time Overcurrent Functions .................................................................................................................. 1

Non-Integrating Timing .......................................................................................................................... 2

Integrating Timing .................................................................................................................................. 2

Built-In Test ............................................................................................................................................ 2

Options ...................................................................................................................................................... 2

Timing .................................................................................................................................................... 2

Neutral Defeat ........................................................................................................................................ 2

Sensing Input Type ................................................................................................................................ 2

Sensing Input Range ............................................................................................................................. 3

Power Supply ......................................................................................................................................... 3

Targets ................................................................................................................................................... 3

Outputs .................................................................................................................................................. 3

Instantaneous Outputs ........................................................................................................................... 3

Packaging .............................................................................................................................................. 3

Model and Style Number Description ........................................................................................................ 4

Controls and Indicators .............................................................................................................................. 5

Functional Description ............................................................................................................................... 9

Block Diagram Analysis ............................................................................................................................. 9

Power Supply ....................................................................................................................................... 10

Current Sensing ................................................................................................................................... 10

Tap Select and Tap Cal ....................................................................................................................... 10

Neutral Defeat ...................................................................................................................................... 10

Multiplexor ............................................................................................................................................ 10

Analog-To-Digital Converter and Level Detector ................................................................................. 10

Time Trip Comparator and Scaler ....................................................................................................... 10

Microprocessor (Not Shown) ............................................................................................................... 10

Instantaneous Overcurrent (Options 1-1 and 1-2) ............................................................................... 11

Timed and Instantaneous Outputs....................................................................................................... 11

Auxiliary Outputs .................................................................................................................................. 11

Push-to-Energize Pushb utt ons ............................................................................................................ 11

Power Supply Status Output (Option 3-6) ........................................................................................... 11

Target Indicators .................................................................................................................................. 11

Installation ................................................................................................................................................. 13

Relay Operating Guidelines and Precautions ......................................................................................... 13

Mounting .................................................................................................................................................. 13

Connections ............................................................................................................................................. 26

Maintenance ............................................................................................................................................ 33

Storage .................................................................................................................................................... 33

Tests and Adjustments ............................................................................................................................. 35

Required Test Equipment ........................................................................................................................ 35

Operational Test ...................................................................................................................................... 35

Preliminary Instructions ....................................................................................................................... 35

Time Overcurrent Pickup Test ............................................................................................................. 38

Neutral Defeat Test .............................................................................................................................. 40

Timed Output Test ............................................................................................................................... 40

Instantaneous Overcurrent Pickup Test .............................................................................................. 42

Adjustments of Controls for Relay Operation .......................................................................................... 43

TAP and TAP (NEUTRAL) Selector Setting ........................................................................................ 44

Time Overcurrent Curve Selection (Timing Type Z1, Z2, and Z3 Only) .............................................. 45

Time Delay Selection ........................................................................................................................... 45

Neutral Time Delay Selection .............................................................................................................. 46

BE1-51 Contents

iv 9137200997 Rev G

INST 1 Control Setting ......................................................................................................................... 46

INST 2 Control Setting ......................................................................................................................... 47

Specifications ............................................................................................................................................ 49

Operational Specifications ....................................................................................................................... 49

Time Overcurrent Pickup Selection Range ......................................................................................... 49

Time Overcurrent Measuring Accuracy ............................................................................................... 49

Time Overcurrent Dropout Rati o .......................................................................................................... 49

Instantaneous Overcurrent Pickup Range ........................................................................................... 49

Instantaneous Overcur rent Meas ur ing Ac c urac y ................................................................................ 49

Instantaneous Overcurrent Dropout Ratio ........................................................................................... 49

Instantaneous Response ..................................................................................................................... 49

Time Delay Accuracy ........................................................................................................................... 50

General Specifications............................................................................................................................. 50

Sensing Input Burden .......................................................................................................................... 50

Sensing Input Rating ........................................................................................................................... 50

Output Circuits ..................................................................................................................................... 50

Power Supply ....................................................................................................................................... 50

Target Indicators .................................................................................................................................. 51

Radio Frequency Interference (RFI) .................................................................................................... 51

Isolation ................................................................................................................................................ 51

Surge Withstand Capability ................................................................................................................. 51

UL Recognized .................................................................................................................................... 51

GOST-R ............................................................................................................................................... 51

Operating Temperature ....................................................................................................................... 51

Storage Temperature ........................................................................................................................... 51

Shock ................................................................................................................................................... 51

Vibration ............................................................................................................................................... 51

Weight .................................................................................................................................................. 51

Case Size ............................................................................................................................................. 51

Time Overcurrent Characteristic Curves ................................................................................................ 53

Revision History ........................................................................................................................................ 91

Contents BE1-51

9137200997 Rev G 1

Introduction

BE1-51 Time Overcurrent Relays are microprocessor-based devices that monitor the magnitude of single­phase, two-phase-and-neutral, or three-phase-and-neutral ac current to provide accurate time overcurrent
and instantaneous overcurrent protection for 50- or 60-hertz power systems.

Standard Features

Time Overcurrent Functions

Time overcurrent elements pick up over a range of 0.1 to 0.8 amperes, 0.3 to 2.4 amperes, 0.5 to 4.0
amperes, 1.5 to 12.0 amperes, 0.1 to 2.4 amperes, or 0.5 to 12.0 amperes and provide an adjustable time
delay that is proportional to the overcurrent. Time delay is initiated when the sensed current exceeds the
pickup point. When the current drops below the pickup point, the timing circuit is reset immediately. At
reset, the output contacts, if operated, are restored to normal.

Adjustment of the overcurrent pickup point is provided by controls on the relay front panel. Time delay is a
function of the characteristic curve that has been selected. Time delay is settable from 00 to 99 on the
TIME DIAL thumbwheel switch located on the front panel. Curve type is selected either as an option or, in
some models, is switch selectable.

Sixty-nine characteristic curves and three timing options are available:
Characteristic curves:

• Seven inverse time

• Nine I

• Seven inverse time with extended timing range

• Nine I

2

t

2

t with extended timing range

• Five British Standard 142 (E curves)

• Seven integrating inverse time

• Nine integrating I

• Seven integrating inverse time with extended timing range

• Nine integrating I

2

t

2

t with extended timing range

Timing option Z1 (switch-selectable, 16-position) B and C curves:

• Seven inverse time

• Nine I

2

t

Timing option Z1 with option 2-D or 2-E (switch-selectable, 16-position) B and C curves:

• Seven inverse time with extended timing range

• Nine I

2

t with extended timing range

Timing option Z2 (switch-selectable, 16-position) B and E (British Standard 142) curves:

• Seven inverse time

• One I

2

t

• Five British Standard (BS) 142 (E curves)

Timing option Z2 with option 2-D or 2-E (switch-selectable, 16-position) B and E (BS142) curves:

• Seven inverse time with extended timing range

• One I

2

t with extended timing range

• Five British Standard 142 (E curves)

Timing option Z3 (switch-selectable, 16-position) integrating B and C curves:

• Seven integrating inverse time

• Nine integrating I

2

t

Timing option Z3 with option 2-D or 2-E (switch-selectable, 16-position) integratin g exten ded B and C

curves:

BE1-51 Introduction

2 9137200997 Rev G

• Seven integrating inverse time with extended timing range

• Nine integrating I

Characteristic curves are shown by the graphs in the Time Overcurrent Characteristic Curves chapter.
Note that each graph (i.e. function) consists of a set of representative curves. Each curve (as well as any
between-curve interpolation) is selectable by the front panel TIME DIAL using a two-digit destinat ion fr om
00 to 99. Because of space limitations, each graph shows only 14 of the 100 possible selections.

2

t with extended timing range

Non-Integrating Timing

Timing options Z1 and Z2 and the characteristic curves available with those options use non-integrating
timing. Non-integrating timing is accomplished by timing at a gate that is not solely dependent on the
magnitude of the applied multiple of pickup current. The time-out value is calculated based on the type of
time curve characteristic selected, time dial setting, and the magnitude of the applied multiple of pickup
current. The time-out value is continuously updated during the timing cycle. When pickup is exceeded, a
timer is initiated. When the timer elapsed time exceeds the calculated time-out value, a time trip output
signal is generated.

This type of non-integrating time delay characteristic exhibits a dynamic characteristic that is immediately
responsive to changes of the applied multiple of pickup current.

Integrating Timing

Timing option Z3 and the characteristic curves available for that option uses integrating timing. Integrating
timing is accomplished by summing time increments that are based on the magnitude of the applied
multiple of pickup current, the time curve characteristic selected, and the time dial value. These time
increments are summed until a predetermined value is exceeded, then a time trip output signal is
generated.

This type of integrating time delay characteristic simulates the operating characteristics of an
electromechanical overcurrent relay.

Built-In Test

A built-in test (BIT) switc h moun ted on the Logic Board provides diagnostic troubleshooting and
calibration.

Options

Timing

An extended timing option multiplies by approximately 5.7, the standard time delays. The resulting curves
are shown following the standard curves in the Time Overcurrent Characteristic Curves chapter.

When timing option Z1, Z2, or Z3 is specified, a printed circuit board mounted selector switch allows a
choice of up to sixteen different time overcurrent functions. Timing option Z1 or Z3 may be further
specified as standard or extended time, depending upon option 2 selection.

Neutral Defeat

When neutral defeat is specified, a front panel switch allows neutral current sensing to be disabled. This
function permits the user to energize desired circuits and not trip because of imbalanced current in the
neutral circuit. After the circuits are balanced, the neutral defeat function can be switched off and neutral
current sensing protection is provided.

Sensing Input Type

When single-phase, two-phase-and-neutral, three-phase, or three-phase-and-neutral sensing has been
specified, the front panel TAP selector and the front panel TAP CAL control set the pickup point for all
phases. An independent front panel TAP (NEUTRAL) selector and front panel CAL (NEUTRAL) control

Introduction BE1-51

9137200997 Rev G 3

set the neutral pickup point. In addition, for three-phase-and-neutral sensing units, one of the seven
sensing input range combinations must be specified.

Sensing Input Range

For three-phase-and-neutral sensing units, input ranges are:

• 0.5 to 4.0 amperes (phase and neutral)

• 1.5 to 12 amperes (phase) and 0.5 to 4.0 amperes (neutral)

• 0.5 to 4 amperes (phase) and 1.5 to 12 amperes (neutral)

• 1.5 to 12 amperes (phase and neutral)

• 0.1 to 0.8 amperes (phase and neutral)

• 0.3 to 2.4 amperes (phase) and 0.1 to 0.8 amperes (neutral)

• 0.3 to 2.4 amperes (phase and neutral)

For all other units, two ranges are available: 0.5 to 12 amperes and 0.1 to 2.4 amperes.

Power Supply

Five power supply options are available:

• 24 Vdc

• 48 Vdc

• 125 Vdc and 100/125 Vac

• 48 Vdc or 125 Vdc and 100/125 Vac

• 250 Vdc and 240 Vac

Targets

Single-phase relays have two function targets that indicate when the time delay or instantaneous
element(s) have operated. On multiple phase relays, additional targets indicate which phase or neutral
element(s) operated.

Function targets may be specified as either internally operated or current operated by a minimum of 0.2
amperes through the output trip circuit. When current operated, the output circuit must be limited to 30
amperes for 0.2 seconds, 7 amperes for 2 minutes, and 3 amperes continuously.

Outputs

Optional normally opened, normally closed, or SPDT auxiliary output contacts may be selected. Contacts
actuate when the output relay is energized. Internally operated front panel mounted targets, and front
panel targets operated by the dc current in the output circuit are available for the time overcurrent and
instantaneous overcurrent functions. Optional front panel mounted PUSH-TO-ENERGIZE-OUTPUT
pushbuttons allow direct actuation of each output relay for external circuit testing.

Instantaneous Outputs

One or two instantaneous overcurrent outputs are optionally available. Each is adjustable up to 40 times
the time overcurrent pickup point. When the sensed current exceeds the instantaneous overcurrent
pickup point, an output relay is energized. An independent front pan el contr ol (INST 1 or IN ST 2) adjusts
the pickup point for each optional output. If more than one phase is applied to the relay, the instantaneous
pickup point will be the same for all phases. If neutral current is sensed, a front panel INST 1 (NEUTRAL)
provides adjustment of the neutral pickup point. Instantaneous overcurrent elements are not voltage
controlled.

Packaging

Each relay is mounted in a drawout cradle and enclosed in a standard utility style case with either semi­flush or projection mounting (depending upon case style selected). An available test plug (Basler Electric
part number 10095) allows the relay to be tested in place without disturbing external control circuit wiring.

BE1-51 Introduction

4 9137200997 Rev G

Model and Style Number Description

Electrical characteristics and operational features included in a particular style of the BE1-51 Time
Overcurrent Relay are defined by a combination of letters and numbers that make up its style number.
The model number, together with the style number, describes the options included in a specific device,
and appears on the front panel, drawout cradle, and inside the case assembly. Upon receipt of a relay, be
sure to check the style number against the requisition and the packing list to ensure that they agree.

The Style Number Identification Chart (Figure 1) illustrates the manner in which the relay style number is
determined. For example, if the style number were H3E-Z1P-B2C1F, the device would have the following
characteristics:

H - Three-Phase-and-Neutral sensing
3 - Sensing input range of 1.5 to 12.0 amperes for phase and 0.5 to 4.0 amperes for neutral
E - Normally open outputs
Z1 - Switch selectable time curves
P - Operating power derived from 125 Vdc or 120 Vac
B - Current operated targets
2 - Two instantaneous elements
C - Push-to-energize outputs
1 - Normally open auxiliary timed output relay
F - Semi-flush mounting

Figure 1. Style Number Identification Chart

Introduction BE1-51

9137200997 Rev G 5

Controls and Indicators

BE1-51 controls and indicators are located on the front panel and left-side interior. The controls and
indicators are shown in Figure 2 and described in Table 1. Your relay may not have all of the controls and
indicators shown and described here.

BE1-51 Controls and Indicators

Figure 2. Location of Controls and Indicators

6 9137200997 Rev G

Table 1. Controls and Indicators

A Phase Tap Calibration Control. This single-turn potentiometer adjusts the phase overcurrent pickup

threshold between the selected phase tap setting and the next lower tap setting.

B Phase Tap Selector. Selects the phase overcurrent pickup point in conjunction with the front panel

Phase Tap Calibration Control (locator A).

C Phase Instantaneous 1 Control. This four-turn potentiometer adjusts the phase instantaneous 1

element trip setting over the range of 1 to 40 times the selected Phase Tap Selector (locator B)
setting value.

D Phase Instantaneous 2 Control. This four-turn potentiometer adjusts the phase instantaneous 2

element trip setting over the range of 1 to 40 times the selected Phase Tap Selector (locator B)
setting value.

E Phase Time Dial Selector. These two knobs set the time delay between sensing of a phase

overcurrent condition and closing of the output contacts. See the Time Overcurrent Characteristic
Curves chapter for curve selection information.

F Target Indicators. LED indicators latch on when the corresponding output relay is energized by an

overcurrent condition. Target indicators are reset by the Target Reset Switch (locator H).

G Push-to-Energize Output Pushbuttons. These recessed pushbuttons are depressed to energize the

external trip circuits for testing purposes. A thin, non-conducting rod should be used to depress the
buttons. Do not use a screwdriver.

H Tap Selector Table. This front-panel reference lists the high and low setting limits for a particular tap

selection.
I Target Reset Switch. Operating this switch resets all active targets (locator F).
J Power Ind ic ator. This LED indicator lights when control power is applied and the relay power supply is

functioning.
K Timing Indicators. A Timing LED lights when the corresponding overcurrent pickup point is reached

and exceeded.
L Neutral Time Dial Selector. These two knobs set the time delay between sensing of a neutral

overcurrent condition and closing of the output contacts. See the Time Overcurrent Characteristic

Curves chapter for curve selection information.
M Neutral Tap Calibration Control. This single-turn potentiometer adjus ts the phase ov er cur rent pickup

threshold between the selected neutral tap setting and the next lower tap setting.
N Neutral Defeat Switch and LED. This switch enables (ON) and disables (OFF) the neutral defeat

function. The corresponding LED lights when the neutral defeat function is enabled (ON).
O Neutral Tap Selector. Selects the neutral overcurrent pickup point in conjunction with the front panel

Neutral Tap Calibration Control (locator M).
P Neutral Instantaneous 1 Control. This four-turn potentiometer adjusts the neutral instantaneous 1

element trip setting over the range of 1 to 40 times the selected Neutral Tap Selector (locator O)

setting value.

The time overcurrent characteristic curve selector (not shown) is located on the left-side interior. This
circuit board mounted switch selects the characteristic curve to be used.

Prior to August 2010, this switch was located behind the front panel.
The normal/test slide switch (not shown) is located on the left-side interior. This switch is only used for

factory testing and must be in the normal position (towards front of relay) for proper operation.
Prior to August 2010, this switch was located on the right-side interior.
The tap range plate (not shown) indicates the terminal connections (high or low) used to select the current

sensing input range. The sensing input ranges are listed in Table 2.
Controls and Indicators BE1-51

9137200997 Rev G 7

Table 2. Sensing Input Ranges

TAP

Range

Plate

or

Pickup

HIGH 2.25 3.00 4.50 5.25 6.75 7.50 9.00 9.75 11.25 12.00 8,7 — — —

LOW 0.75 1.00 1.50 1.75 2.25 2.50 3.00 3.25 3.75 4.00 9,7 — — —

HIGH 2.25 3.00 4.50 5.25 6.75 7.50 9.00 9.75 11.25 12.00 8,7 14,15 17,18 —

LOW 0.75 1.00 1.50 1.75 2.25 2.50 3.00 3.25 3.75 4.00 9,7 13,15 16,18 —

HIGH 2.25 3.00 4.50 5.25 6.75 7.50 9.00 9.75 11.25 12.00 8,7 — 14,15 17,18

LOW 0.75 1.00 1.50 1.75 2.25 2.50 3.00 3.25 3.75 4.00 9,7 — 13,15 16,18

Phase

or

Neutral

Phase 2.25 3.00 4.50 5.25 6.75 7.50 9.00 9.75 11.25 12.00 8,9 13,14 15,16 —

Neutral 0.75 1.00 1.50 1.75 2.25 2.50 3.00 3.25 3.75 4.00 — — — 17,18

A B C D E F G H I J ØA ØB ØC N

Sensing Input Range 1, Two-Phase-and-Neutral *

Sensing Input Range 2, Three-Phase-and-Neutral

0.75 1.00 1.50 1.75 2.25 2.50 3.00 3.25 3.75 4.00 8,9 13,14 15,16 17,18

Sensing Input Range 3, Three-Phase-and-Neutral

TAP Selector

Sensing Input Range 1, Single-Phase *

Sensing Input Range 1, Three-Phase *

Current Sensing

Terminals

Sensing Input Range 4, Three-Phase-and-Neutral

Phase 0.75 1.00 1.50 1.75 2.25 2.50 3.00 3.25 3.75 4.00 8,9 13,14 15,16 —

Neutral 2.25 3.00 4.50 5.25 6.75 7.50 9.00 9.75 11.25 12.00 — — — 17,18

Sensing Input Range 5, Three-Phase-and-Neutral

Phase or

Neutral

Phase or

Neutral

Phase 0.45 0.60 0.90 1.05 1.35 1.50 1.80 1.95 2.25 2.40 8,9 13,14 15,16 —

Neutral 0.15 0.20 0.30 0.35 0.45 0.50 0.60 0.65 0.75 0.80 — — — 17,18

Phase or

Neutral

HIGH 0.45 0.60 0.90 1.05 1.35 1.50 1.80 1.95 2.25 2.40 Same as Range 1

LOW 0.15 0.20 0.30 0.35 0.45 0.50 0.60 0.65 0.75 0.80 Same as Range 1

2.25 3.00 4.50 5.25 6.75 7.50 9.00 9.75 11.25 12.00 8,9 13,14 15,16 17,18

Sensing Input Range 6, Three-Phase-and-Neutral

0.15 0.20 0.30 0.35 0.45 0.50 0.60 0.65 0.75 0.80 8,9 13,14 15,16 17,18

Sensing Input Range 7, Three-Phase-and-Neutral

Sensing Input Range 8, Three-Phase-and-Neutral

0.45 0.60 0.90 1.05 1.35 1.50 1.80 1.95 2.25 2.40 8,9 13,14 15,16 17,18

Sensing Input Range 9 (All Other Sensing Types) *

* For relays with sensing input ranges 1 or 9, connect the system wiring to the current sensing terminals
for the desired range (HIGH or LOW).

BE1-51 Controls and Indicators

8 9137200997 Rev G

Refer to Table 3 for target installation configurations.

Table 3. Target Installation Configurations

Number of Instantaneous Elements Targets Installed (Types A and B)

Sensing

Input Type

None One Two

X X

Element Function

A B C N TIME INST 1 INST 2

K

G

H

X

X X X
X X X X

X X X X

X X X X X X
X X X X X X X

X X X X X

X X X X X X X
X X X X X X X X

X X X X

X X X X X X
X X X X X X X

Controls and Indicators BE1-51

9137200997 Rev G 9

Functional Description

BE1-51 Time Overcurrent Relays are microprocessor-based devices that provide protection for the phase
or phase and neutral time and instantaneous overcurrent functions.

Block Diagram Analysis

The following block diagram analysis is referenced to Figure 3. A microprocessor (not illustrated in Figure

3) processes signals, performs logic functions, and all of the time overcurrent computations.

Figure 3. Functional Block Diagram

BE1-51 Functional Description

10 9137200997 Rev G

Power Supply

Operating power for the relay circuitry is supplied by a wide range, electrically isolated, low-burden power
supply. Power supply operating power is not polarity sensitive. The front panel power LED and power
supply status output indicate when the power supply is operating. Power supply specifications are listed in
the Specifications chapter.

Current Sensing

All relay models (except three-phase-and-neutral units) have two sensing ranges for each phase. Each
high/low sensing range has its own set of input terminal connections.

• Five ampere CTs have: LOW (0.5 A to 4.0 A) and HIGH (1.5 A to 12.0 A).

• One ampere CTs have: LOW (0.1 A to 0.8 A) and HIGH (0.3 A to 2.4 A).

Three-phase-and-neutral sensing units, however, have one of four possible combinations of input sensing
ranges with one range for neutral and one range for the phases.

• Five ampere CTs have: 0.5 A to 4.0 A and 1.5 A to 12.0 A.

• One ampere CTs have: 0.1 A to 0.8 A and 0.3 A to 2.4 A.

Tap Select and Tap Cal

Front panel TAP selectors and TAP CAL controls are provided for selection and precise adjustment of
the phase and neutral (if provided) time overcurrent pickup points. The front panel TAP selectors, ten­position BCD weighted rotary switches, select the desired current sensing pickup point, while the front
panel TAP CAL controls provide precise adjustment between the selected setting and the next lower
setting.

Neutral Defeat

Front panel mounted switch allows neutral current sensing to be disabled. When the switch is set to ON, a
current imbalance in the neutral circuit will not trip the output contacts.

Multiplexor

The multiplexor sequentially switches a voltage representing each of the sensed input currents to the
analog-to-digital converter and level detector.

Analog-To-Digital Converter and Level Detector

Analog dc voltages representing the sensed currents from the multiplexor are converted to binary
numbers (successive approximation) and applied to the time trip comparator and scaler circuits.

Time Trip Comparator and Scaler

This circuit accepts both the binary number representing the detected current level and the desired time
delay characteristic selected by the front panel TIME DIAL, then computes the required time delay before
the timed output relay will be energized. Time delay characteristics are shown in the curves located in the
Time Overcurrent Characteristic Curves chapter. If extended timing range options 2-D or 2-E is present,
the time delay characteristic curves are modified so that the time delay is approximately 5.7 times the
derived value.

Time delay computations are updated continuously so that changes in the overcurrent condition are
monitored and result in a corresponding change in the time delay. A software counter begins counting
when the initial binary number is received from the analog-to-digital converter and level detector. The
counter measures the elapsed time of the overcurrent condition, and resets if the current decreases
below the pickup point. This continuously increasing binary number is then passed to the comparator.

Microprocessor (Not Shown)

Some of the circuitry already discussed is part of the microprocessor and no definite lines are drawn to
separate the functions. The microprocessor compares the desired time delay (from the time trip

Functional Description BE1-51

9137200997 Rev G 11

comparator and scaler) with the actual elapsed time from the counter. When the elapsed time reaches the
intended delay, the timed output relay is energized. During the time delay period, the front panel TIMING
indicator (i.e. pickup) associated with the detected phase is illuminated.

If targets are present, the front panel TIME FUNCTION target wi ll be tripp ed, and the A, B, C, or N
ELEMENT target associated with the detected phase will be tripped. See the Controls and Indicators
chapter for the types of targets that are present (depending upon relay configuration).

If option 3 is present, an auxiliary output relay (with N.O., N.C., or SPDT contacts) is also actuated when
the timed output relay energizes.

Instantaneous Overcurrent (Options 1-1 and 1-2)

Input current levels applied to the time overcurrent circuitry are also passed to the instantaneous
overcurrent circuitry. These levels are compared to the setting of the front panel INST 1 adjust and the
front panel INST 1 (NEUTRAL) adjust (if present). If the input current level is above the setting, the output
driver energizes the instantaneous 1 output relay. If the instantaneous 2 option is present, the input level
is also compared with the setting of the front panel INST 2 adjust to energize the instantaneous 2 output
relay. Note that the current level settings for the instantaneous overcurrent element will always be from 1
to 40 times above the front panel TAP and TAP (NEUTRAL) settings of the time overcurrent element.

If target type A or B is present, the front panel INST 1 target and the front panel INST 2 targets are
tripped when their respective output relay is energized, along with the front panel A, B, C or N ELEM EN T
targets (if present) associated with the detected phases. (See the Controls and Indicators chapter for the
types of targets that can be present depending upon the relay configuration.)

Timed and Instantaneous Outputs

Each output signal (representing either time overcurrent or instantaneous overcurrent) from each
monitored phase (or neutral) is applied to the respective output driver. Each output driver supplies
operating current to energize the associated output relay. Either normally open (output type E) or normally
closed (output type G) contacts may be specified. (The contact configurations of all output relays for a
given model will be the same.)

Auxiliary Outputs

In addition to the output relays, an auxiliary relay, having the same or a different contact configuration,
may be specified. Both the output and the auxiliary relays will remain energized for the duration of the
overcurrent condition.

Push-to-Energize Pushbuttons

If either option 2-C or 2-E is present, each individual output relay can be directly energized for test
purposes by the actuation of a front panel PUSH-TO-ENERGIZE OUTPUT pushbutton. The pushbutton is
actuated by the insertion of a thin, non-conducting rod through an access hole in the front panel.

Power Supply Status Output (Option 3-6)

Power supply status output relays have a set of normally closed contacts that are energized open during
power-up. If either or both power supply output legs (+12 Vdc or −12 Vdc) fails, the power supply status
output relay is de-energized and the output contacts close. Shorting bars across the output contacts are
held open by the installed connection plug. When the relay is removed from service by removing the
connection plug, the shorting bars are closed.

Target Indicators

Target indicators are optional components selected when a relay is ordered. The electronically latched
and reset targets consist of red LED indicators located on the relay front panel. A latched target is reset
by operating the target reset switch on the front panel. If relay operating power is lost, any illuminated
(latched) targets are extinguished. When relay operating power is restored, the previously latched targets
are restored to their latched state.

BE1-51 Functional Description

12 9137200997 Rev G

Note

A relay can be equipped with either internally operated targets or current operated targets.

Internally Operated Targets

The relay trip outputs are directly applied to drive the appropriate target indicator. Each indicator is
illuminated regardless of the current level in the trip circuit.

Current Operated Targets

A current operated target is triggered by closure of the corresponding output contact and the presence of
at least 200 milliamperes of current flowing in the trip circuit.

Note that the front panel function targets (TIMED, INST 1, etc.) may be either internally or current
operated. Phase and neutral indicators are current operated only if the instantaneous options are not
included and if current operated targets are specified.

Prior to August 2007, BE1-51 target indicators consisted of
magnetically latched, disc indicators. These mechanically latc h ed
target indicators have been replaced by the electronically latched LED
targets in use today.

Functional Description BE1-51

9137200997 Rev G 13

Caution

Note

Installation

BE1-51 relays are shipped in sturdy cartons to prevent damage during transit. Upon receipt of a relay,
check the model and style number against the requisition and packing list to see that they agree. Inspect
the relay for shipping damage. If there is evidence of damage, file a claim with the carrier, and notify your
sales representative or Basler Electric.

If the relay will not be installed immediately, store it in its original shipping carton in a moisture- and dust­free environment. Before placing the relay in service, it is recommended that the test procedures of the
Tests and Adjustments chapter be performed.

Relay Operating Guidel ines and Precautions

Before installing or operating the relay, note the following guidelines and precautions:

• For proper current operated target operation, a minimum current of 200 milliamperes must flow

through the output trip circuit.

• If a wiring insulation test is required, remove the connection plugs and withdraw the relay from its

case.

When the connection plugs are removed, the relay is disconnected
from the operating circuit and will not provide system protection.
Always be sure that external operating (monitored) conditions are
stable before removing a relay for inspection, test, or service.

Be sure that the BE1-51 is hard-wired to earth ground with no smaller
than 12 AWG copper wire attached to the ground terminal on the rear
of the case. When the BE1-51 is configured in a system with other
devices, it is recommended to use a separate lead to the ground bus
from each device.

Mounting

Because the relay is of solid-state design, it does not have to be mounted vertically. Any convenient
mounting angle may be chosen. Refer to the following figures for relay outline dimensions and panel
drilling diagrams.

BE1-51 Installation

14 9137200997 Rev G

Figure 4. Panel Cutting/Drilling, Semi-Flush, S1 Case

Installation BE1-51

9137200997 Rev G 15

Figure 5. S1 Case Dimensions, Rear View, Double Ended, Semi-Flush Mount

BE1-51 Installation

16 9137200997 Rev G

.75

(19.1)(157.2)

6.19

(49.53)

1.95

10-32 SCREWS

(7.9)

.31

10-32 SCREWS

(102.4)

4.03

4.03

(102.4)

(

7.9)

.31

MOUNTING PANEL

(55.75

)

2.195

P0066-64

Figure 6. S1 Case Dimensions, Side View, Double Ended, Semi-Flush Mount

Installation BE1-51

9137200997 Rev G 17

Figure 7. S1 Case Dimensions, Rear View, Single Ended, Semi-Flush Mount

BE1-51 Installation

18 9137200997 Rev G

.75

(19.1)(157.2)

6.19

(49.53)

1.95

10-32 SCREWS

MOUNTING PANEL

(55.75)

2.195

P0066-69

8.06

(204.72)

(7.9)

.31

Figure 8. S1 Case Dimensions, Side View, Single Ended, Semi-Flush Mount

Installation BE1-51

9137200997 Rev G 19

Figure 9. Panel Cutting/Drilling, Double Ended, Projection Mount, S1 Case

BE1-51 Installation

20 9137200997 Rev G

Figure 10. S1 Case Dimensions, Rear View, Double Ended, Projection Mount

Installation BE1-51

9137200997 Rev G 21

.

75

(

19

.1

)

(

157.

2)

6.

19

(

49

.53

)

1

.

95

10-

32 SCREWS

(

7.

9

)

.

31

10

-32 SCREWS

(

102.4)

4.

03

4.03

(102.

4)

(7.

9)

.

31

(55

.75

)

2.

195

P0066-

67

TERMINAL EXTENSION

(TYP.)
FOR DETAILED INSTRUCITONS,
SEE THE TERMINAL PROJECTION
MOUNTING KIT SUPPLIED.

.25

(6.

4)

5

/16-

18

STUD

2

PLACES

MOUNTING PANEL

Figure 11. S1 Case Dimensions, Side View, Double Ended, Projection Mount

BE1-51 Installation

22 9137200997 Rev G

Figure 12. Panel Cutting/Drilling, Single Ended, Projection Mount, S1 Case

Installation BE1-51

9137200997 Rev G 23

Figure 13. S1 Case Dimensions, Rear View, Single Ended, Projection Mount

BE1-51 Installation

24 9137200997 Rev G

(157.2)

6.19

(49.53)

1.95

10-32 SCREWS

MOUNTING PANEL

(55.75)

2.195

P0066-71

TERMINAL EXTENSION (TYP.)
FOR DETAILED INSTRUCITONS,
SEE THE TERMINAL PROJECTION
MOUNTING KIT SUPPLIED.

.25
(6.4)

5/16-18 STUD
2 PLACES

MOUNTING PANEL

8.06

(204.72)

(7.9)

.31

.75
(19.1)

Figure 14. S1 Case Dimensions, Side View, Single Ended, Projection Mount

Installation BE1-51

9137200997 Rev G 25

P

0066-68

Figure 15. S1 Case Cover Dimensions, Front View

BE1-51 Installation

26 9137200997 Rev G

Connections

Be sure to check the model and style number of a relay before connecting and energizing the relay.
Incorrect wiring may result in damage to the relay. Except where noted, connections should be made with
wire no smaller than 14 AWG.

Typical external and internal connections are shown in the following figures.
To prevent an inductive overload of the relay contacts, it is necessary to break the trip circuit e x ter n a lly

through the 52a contacts.
Relay circuitry is connected to the case terminals by removable connection plugs (1 plug for 10-terminal

cases and 2 plugs for 20-terminal cases). Removal of the connection plug(s) opens the normally open trip
contact circuits and shorts the normally closed trip circuits before opening the power and sensing circuits.

Installation BE1-51

Figure 16. Typical External Connections, Current Operated Targets, DC Powered

9137200997 Rev G 27

Figure 17. Typical Sensing External Connections, Sensing Input Type G or K

Figure 18. Typical Sensing External Connections, Sensing Input Type I or X

BE1-51 Installation

28 9137200997 Rev G

Figure 19. Typical Sensing External Connections, Sensing Input Type H or V

Installation BE1-51

9137200997 Rev G 29

Figure 20. Typical Internal Diagram, Sensing Input Type K

BE1-51 Installation

30 9137200997 Rev G

Figure 21. Typical Internal Diagram, Sensing Input Type I or X

Installation BE1-51

9137200997 Rev G 31

Figure 22. Typical Internal Diagram, Sensing Input Type G

BE1-51 Installation

32 9137200997 Rev G

Figure 23. Typical Internal Diagram, Sensing Input Type H or V

Installation BE1-51

9137200997 Rev G 33

Maintenance

BE1-51 relays require no preventative maintenance other than a periodic operational check. If the relay
fails to function properly, contact Technical Sales Support at Basler Electric to coordinate repairs.

Storage

This device contains long-life aluminum electrolytic capacitors. For devices that are not in service (spares
in storage), the life of these capacitors can be maximized by energizing the device for 30 minutes once
per year.

BE1-51 Installation

34 9137200997 Rev G

Installation BE1-51

9137200997 Rev G 35

Note

Note

Tests and Adjustments

Procedures in this section are for use in testing and adjusting a relay for the desired operation in a
protective scheme. If a relay fails an operational test, or if an adjustment discloses a faulty relay, contact
Basler Electric.

Required Test Equipment

Minimum test equipment required for relay testing and adjustment is listed below. Refer to the following
figures for test setups.

• Appropriate ac or dc power source for relay operation

• Appropriate ac source (50- or 60-hertz as appropriate) for current testing

• Dc external power source for output relay(s) test setup and timer input

• Relay test set capable of delivering 40 amperes. A higher capability is needed for instantaneous

settings above 40 amperes

• Timer

• One shunt resistor for providing minimum target load

Operational Test

Preliminary Instructions

Perform the following steps before going on to any testing.
Step 1. Connect the relay test setup in accordance with Figures 24 through 27, depending upon the

sensing input type for your relay (see the style chart in the Introduction chapter).
(a) Sensing Input Type K (Single-Phase Sens ing) . Refer to Figure 24

For relays having the above sensing, only the front panel LOW range
current sense terminal(s) should be connected for a complete check of
the relay.

Ensure that timed output termina ls 1 and 10 are conn e cted.

(b) Sensing Input Type G (Three-Phase Sensing). Refer to Figure 25

For relays having the above sensing, only the from panel LOW range
current sense terminal(s) should be connected for a complete check of
the relay.

.

.

For all three-phase relays, the test signals must connect to both the
current and voltage terminals for the same phase.

Ensure that timed output termina ls 1 and 10 are conne c ted.

(c) Sensing Input Type H or V (Three-Phase with Neutral Sensing). Refer to Figure 26

BE1-51 Tests and Adjustments

.

36 9137200997 Rev G

Ensure that the timed output terminals 1 and 10 are connected. Also, verify that either A,
B, or C current sense terminals are connected initially (N terminals will be connected later
in the test).

(d) Sensing Input Type I or X (Two-Phase with Neutral Sensing). Refer to Figure 27

.

Ensure that the timed output terminals 1 and 10 are connected. Also, verify that either A,
B, or C current sense terminals are connected initially (N terminals will be connected later

in the test).
Step 2. Remove the relay front cover.
Step 3. Set the front panel TIME DIAL selector and, if present, the front panel TIME DIAL (NEUTRAL)

selector to 99.
Step 4. Adjust the front panel INST 1 and INST 2 controls, if present, fully clockwise (CW).
Step 5. Adjust the front panel TAP CAL control, and if present, the front panel TAP (NEUTRAL) control

fully CW.
Step 6. Ensure that the relay front panel TARGETS, if present, are reset.

Figure 24. Test Setup for Sensing Input Type K (Single-Phase Sensing)

Tests and Adjustments BE1-51

9137200997 Rev G 37

Figure 25. Test Setup for Sensing Input Type G (Three-Phase Sensing)

Figure 26. Test Setup for Sensing Input Type H or V (Three-Phase with Neutral Sensing)

BE1-51 Tests and Adjustments

38 9137200997 Rev G

Note

Figure 27. Test Setup for Sensing Input Type I or X (Two-Phase with Neutral Sensing)

Time Overcurrent Pickup Test

This test checks the minimum and maximum overcurrent pickup points of the time overcurrent element.

During this test, disregard any indication on the test setup timer.

Step 1. Perform the preliminary instructions.
Step 2. Set the front panel TAP selector to A.
Step 3. Adjust the test set, for an overcurrent threshold having one of the following values:

(a) 0.5 for relays with Sensing Input Range 1, 2, or 4.

(b) 1.5 A for relays with Sensing Input Range 3 or 5.
Step 4. Slowly adjust the front panel TAP CAL control CCW until the front panel TIMING indicator

illuminates.
RESULT: For the phase minimum overcurrent pickup point of 0.5 A (Step 3a, above) or 1.5 A

(Step 3b, above) the front panel TAP CAL control should be near its maximum CCW limit.
Step 5. Adjust the front panel TAP CAL control fully CW to allow measurement of the actual

overcurrent pickup point at the A setting of the front panel TAP selector. Note that the front

panel TIMING indicator wil l exting uis h. Do not disturb t his sett ing.
Step 6. Slowly increase the current toward the value of the front panel TAP selector A setting until the

front panel TIMING indicator illuminates. Do not disturb this setting.
Step 7. Record the current reading and remove input current.
RESULT: The recorded value should be within ±5% of the front panel TAP selector A setting

for the phase minimum overcurrent pickup point for the time overcurrent.
Step 8. Set the front panel TAP selector to J.

Tests and Adjustments BE1-51

9137200997 Rev G 39

Step 9. Slowly adjust the test set, inc r easing the ov erc ur rent threshold toward the value of the front

panel TAP selector J setting until the front panel TIMING indicator just illuminates. Do not

disturb this setting.
Step 10. Record the current reading and remove input current.
RESULT: The recorded value should be within ±5% of the front panel TAP selector J setting for

the phase maximum overcurrent pickup point for the time overcurrent element.
Step 11. Perform the following steps as appropriate for the correct sensing input types.

(a) Sensing Input Type K (Single-Phase Sensing). This concludes the time overcurrent test.

Proceed to the timed output test.

(b) Sensing Input Type I or X (Two-Phase and Neutral Sensing). Remove the power and

reconnect the input sensing to the remaining phases as shown in Figure 27, eac h time
repeating Steps 1 through 10. For neutral testing, continue with Step 12.

(c) Sensing Input Type G (Three-Phase Sensing). Remove the power and reconnect the

input sensing to each of the remaining phases as shown in Figure 25, each time
repeating Steps 1 through 10.

(d) Sensing Input Type H or V (Three-Phase with Neutral Sensing). Remove the power and

reconnect the input sensing to each of the remaining phases as shown in Figure 26, each

time repeating Steps 1 through 10. For neutral testing, continue with Step 12.
Step 12. Perform the preliminary instructions.
For the neutral sensing (terminals 17 and 18), connect the relay as shown in Figures 26 and 27,

then perform the following steps (Steps 13 through 21).
Step 13. Set the front panel TAP (NEUTRAL) selector to A.
Step 14. Adjust the test set for an overcurrent threshold having one of the following values:

(a) 0.5 A for relays with Sensing Input Range 2 or 3.

(b) 1.5 A for relays with Sensing Input Range 4 or 5.
Step 15. Slowly adjust the front panel CAL (NEUTRAL) control CCW until the front panel TIMING

indicator illuminates.
RESULT: For the neutral minimum overcurrent pickup point of 0.5 A (Step 16a, above) or 1.5 A

(Step 16b, above) the front panel CAL (NEUTRAL) control should be near its maximum CCW

limit.
Step 16. Adjust the front panel CAL (NEUTRAL) control fully CW to allow measurement of the actual

overcurrent pickup point at the A setting of the front panel TAP (NEUTRAL) selector. Note that

the front panel TIMING (NEUTRAL) indicator will extinguish. Do not disturb this setti ng.
Step 17. Slowly increase the current toward the value of the front panel TAP (NEUTRAL) selector A

setting until the front panel TIMING (NEUTRAL) indicator illuminates. Do not disturb this

setting.
Step 18. Record the current reading and remove input current.
RESULT: The recorded value should be within ±5% of the front panel TAP (NEUTRAL)

selector A setting for the neutral minimum overcurrent pickup point for the time overcurrent.
Step 19. Set the front panel TAP (NEUTRAL) selector to J.
Step 20. Slowly adjust the test set, increasing the overcurrent threshold toward the value of the front

panel TAP (NEUTRAL) selector J setting until the front panel TIMING (NEUTRAL) indicator

just illuminates. Do not disturb this setting.
Step 21. Record the current reading and remove input current.

BE1-51 Tests and Adjustments

40 9137200997 Rev G

Note

RESULT: The recorded value should be within ±5% of the front panel TAP (NEUTRAL)

selector J setting for the neutral maximum overcurrent pickup point for the time overcurrent

element.

Neutral Defeat Test

Step 1. Perform the preliminary instructions.
Step 2. Set the front panel NEUTRAL TAP selector to A.
Step 3. Set the front panel NEUTRAL TIME DIAL selector to 00.
Step 4. Apply two times (200%) input current of tap A to neutral terminals and allow relay to time out

(trip).
Step 5. Set the front panel NEUTRAL DEFEAT switch to ON (up).
RESULT: (1) NEUTRAL DEFEAT LED illuminates.

(2) NEUTRAL TIMING LED extinguishes.

(3) Output relay opens (closes if NC).
Step 6. Set the front panel NEUTRAL DEFEAT switch to OFF (down).
RESULT: (1) NEUTRAL DEFEAT LED extinguishes.

(2) NEUTRAL TIMING LED illuminates.

(3) Output relay closes (opens if NC) after appropriate time delay.
Step 7. Remove input current.

Timed Output Test

This test checks the accuracy of the time overcurrent characteristic delay.

For relays having three-phase sensing (Sensing Input Type G or V),
only a single input phase needs to be connected, since this is
sufficient for a complete test of the Time Delay. For relays that include
neutral sensing (Sensing Input Type H, I, V, or X) this test includes
reconnecting the Test Output to the Neutral Sensing terminals for
testing the Timed Output during neutral sensing.

Step 1. Verify that the preliminary instructions have been performed.
Step 2. (Timing type Z1, Z2, or Z3 only.) Select the desired time current characteristic curve.
Step 3. Set the front panel TAP selector to B.
Step 4. Adjust the front panel TIME DIAL to 20.
Step 5. Adjust the test set for an overcurrent threshold of precisely 5 times the front panel TAP selector

B setting.
Step 6. Apply input current to the relay and initiate the test setup timer.
Step 7. Observe that the appropriate front panel TIMING indicator illuminates and when the time delay

ends that the timed output relay is energized.
RESULTS: (1) The appropriate front panel TIMING indicator extinguishes .

(2) The test setup timer stops. (Record count for use in Step 9.)
(3) If target type A or B is present:

Tests and Adjustments BE1-51

9137200997 Rev G 41

Note

Note

(a) The front panel FUNCTION-TIME target (if present) trips.
(b) The appropriate front panel ELEMENT target A, B, or C (if present)

trips.

Step 8. Remove input current and (if present) reset the relay front panel targets.

Due to delays inherent in the test equipm ent, the ti me del ay for the
following test may appear to exceed these limits.

Step 9. On the appropriate time overcurrent curve chart (in the Time Overcurrent Characteristic Curves

chapter), locate the line representing 5 times the tap value (from Step 5) where it intersects the

particular curve representing the front panel TIME DIAL setting of 20 (from Step 4). The

resulting time delay value in seconds should be within ±5% of the timer reading [from Step

7(2)].
Step 10. Adjust the front panel TIME DIAL to 40, 60, and 99, each time repeating Steps 6 through 9.

For relays having two-phase-and-neutral, three-phase, or three-phase­and-neutral sensing (Sensing Input Types G, H, I, V, or X) it is not
necessary to repeat this test for the remaining phases.

For relays having two-phase-and-neutral, or three-phase-and-neutral
sensing (Sensing Input Types H, I, V, or X) perform Steps 11 through

20.
For relays having single-phase or three-phase sensing (Sensing Input

Types G or K) with instantaneous overcurrent option 1-1 or 1-2,
proceed to the instantaneous overcurrent test.

Step 11. Remove the power and reconnect the test output to the neutral current sensing input of the

relay as shown in Figures 26 and 27 (terminals 17 and 18).
Step 12. Set the front panel TAP (NEUTRAL) selector to B.
Step 13. Rotate the front panel CAL (NEUTRAL) control fully CW.
Step 14. Rotate the front panel TIME DIAL (NEUTRAL) to 20.
Step 15. Ensure that all relay targets have been reset.
Step 16. Adjust the test set for an overcurrent threshold of precisely 5 times the front panel TAP

(NEUTRAL) selector B setting as meas ur ed by the ammet er.
Step 17. Apply input current to the relay and initiate the test setup timer.
RESULTS: Observe that the appropriate front panel TIMING (NEUTRAL) indicator illuminates.
Step 18. When the time delay ends, the timed output relay is energized.
RESULTS: (1) The front panel TIMING (NEUTRAL) indicator extinguishes.
(2) The test setup timer stops. (Record count for use in Step 20.)
(3) If target Type A or B is present:
(a) Front panel FUNCTION-TIME target (if present) trips.
(b) Appropriate front panel ELEMENT target A, B, or C (if present) trips.

BE1-51 Tests and Adjustments

42 9137200997 Rev G

Note

Note

Step 19. Remove input current and (if present) reset the relay front panel targets.
Step 20. On the appropriate time overcurrent curve chart (in the Time Overcurrent Characteristic Curves

chapter), locate the line representing 5 times the tap value (from Step 5) where it intersects the

particular curve representing the front panel TIME DIAL (NEUTRAL) setting of 20 (from Step

14). The resulting time delay value in seconds should be within ±5% of the timer reading [from

step 18(2)].

Due to delays inherent in the test equipment, the time delay may
appear to exceed these limits. This concludes the timed output test.

Relays having instantaneous overcurrent option 1-1 or 1-2 only
proceed to the Instantaneous Overcurrent Pickup Test

Instantaneous Overcurrent Pickup Test

This test checks the minimum overcurrent pickup points for Instantaneous 1 and (if present)
Instantaneous 2 outputs.

For relays having three-phase sensing (Sensing Input Types G or V),
only a single input phase is connected since this is sufficient for a
complete test of the instantaneous overcurrent sensing and output.

For relays that include neutral sensing (Sensing Input Types H, I, V, or
X), this test includes reconnecting the test output to the neutral
sensing terminals for testing the instantaneous 1 output during neutral
sensing.

Step 1. Perform the preliminary instructions.
Step 2. Reconnect the test setup to the INST 1 output terminals 2 and 10 as shown in Figures 24

through 27. Note that the timer may be removed from the test setup at this time.
Step 3. Set the TAP selector to A.
Step 4. Turn the front panel INST 1 control fully CCW to establish a pickup point of 1 times the TAP

selector A setting.
Step 5. Slowly adjust the test set, increasing the overcurrent threshold toward the value of the front

panel TAP selector A setting until the Instantaneous 1 output relay energizes.
RESULT: If target Type A or B is present:
(a) The front panel FUNCTION-INST 1 target (if present) will trip.
(b) The appropriate front panel ELEMENT target A, B, or C (if present) will trip.
Step 6. Remove input current. Record the test set current setting.
RESULT: The recorded value should be equal to or less than the front panel TAP selector A

setting for the minimum overcurrent pickup point for the instantaneous 1 overcurrent element.
Step 7. Reset the relay front panel targets (if present).
Step 8. Turn the front panel INST 1 control fully CW to establish a pickup point of 40 times the front

panel TAP selector A setting.
Step 9. Adjust the test set to approximately 35 times the front panel TAP selector A setting.

Tests and Adjustments BE1-51

9137200997 Rev G 43

Note

Step 10. Slowly adjust the test set further toward an overcurrent threshold of 40 times the front panel

TAP selector A setting until the instantaneous 1 output relay energizes. Do not disturb this

setting.
RESULT: If target Type A or B is present:
(a) The front panel FUNCTION-INST 1 target (if present) will trip.
(b) The appropriate front panel ELEMENT target A, B, or C (if present) will trip.
Step 11. Record the current reading. Remove input current (the front panel TIMING indicator should

extinguish).

RESULT: The recorded value should be greater than 40 times the front panel TAP selector A

setting for the maximum overcurrent pickup point for the instantaneous 1 overcurrent element.

For relays having neutral sensing (Sensing Input Types H, I, V, or X)
perform Step 12. For relays with option 1-2 (INST 2 elements),
perform Step 13. Otherwise, the test ends here.

Step 12. For the neutral sensing, connect the relay as shown in Figures 26 and 27, then repeat Steps 2

through 11, substituting the following:
(a) The front panel TAP (NEUTRAL) selector instead of the front panel TAP selector (Step 3).
(b) The front panel INST 1 (NEUTRAL) control instead of the front panel INST 1 control

(Step 4).
Step 13. Reconnect the test setup to the INST 2 output terminals (11 and 12) as shown in Figure 24 then

repeat Steps 4 through 11, substituting the following:
(a) Front panel INST 2 control instead of the front panel INST 1 control (Step 3).
(b) Front panel FUNCTION-INST 2 target instead of the front panel INST 1 tar get ( Step 4).
(c) Instantaneous 2 output relay instead of the instantaneous 1 output relay (Step 2).

Adjustments of Controls f or Rel a y Operation

The following procedures set up the relay for use in a protective scheme. The procedures are arranged in
a logical sequence that prevents upsetting previous control settings. For relays not having certain options,
skip the corresponding adjustment paragraph. These paragraphs are identified by their headings.

BE1-51 Tests and Adjustments

44 9137200997 Rev G

Note

TAP and TAP (NEUTRAL) Selector Setting

Selection of one of the specific overcurrent pickup points provided by
the front panel TAP selector (and with the front panel TAP CAL
control fully CW) will permit a pickup point within ±5% of the selector
value without having to connect the relay to a test setup to verify the
setting. If present, the front panel TAP (NEUTRAL) selector and the
front panel CAL (NEUTRAL) control provide this function for the
neutral overcurrent pickup point.

However, if the desired pickup point falls between these front panel
TAP selector settings, or if the instantaneous overcurrent option 1-1 or
1-2 is present, the relay should be connected to a test setup for a
precise setting, then the following steps should be performed.

Step 1. Connect the test setup to the relay according to the sensing input type present in the relay as

follows:

(a) Sensing Input Type K: Refer to Figure 24

provides the needed pickup indication, do not connect the test setup to the output
terminals. The current sense terminals for the desired range (HIGH or LOW), however,
should be connected to the relay.

(b) Sensing Input Types I or X: Refer to Figure 27. Because the relay front panel TIMING

indicator provides the needed pickup indication, do not connect the test setup to the output
terminals. The front panel TAP selector is ganged and the adjustment of one input phase
automatically aligns the other, thus, only one set of current sense terminals need be
connected. For adjustment of the front panel TAP (NEUTRAL) selector , the relay is
reconnected for neutral sensing by this procedure.

(c) Sensing Input Type G: Refer to Figure 25. Because the relay front panel TIMING indicator

provides the needed pickup indication, do not connect the test setup to the output
terminals. The desired range terminals (HIGH or LOW), however, should be connected to
the relay. The front panel TAP selector is ganged and the adjustment of one input phase
automatically aligns the others, thus, only one set of current sense terminals nee d be
connected.

(d) Sensing Input Types H or V: Refer to Figure 26. Because the relay front panel TIMING

indicator provides the needed pickup indication, do not connect the test setup to the output
terminals. The front panel TAP selector is ganged and the adjustment of one input phase
automatically aligns the others, thus, only one set of current sense terminals need be
connected. For adjustment of the front panel TAP (NEUTRAL) selector, the relay is
reconnected for neutral sensing by this procedure.

Step 2. Remove the relay front cover.

. Because the relay front panel TIMING indicator

Step 3. Sensing Input Types G, I, K, or X. Verify that the front panel TAP RANGE plate is installed and

the correct range (HIGH or LOW) is visible.
Step 4. Adjust the test current to the desired time overcurrent pickup point for the relay.
Step 5. Set the front panel TAP selector to the closest setting above the desired pickup point.
Step 6. Adjust the front panel TAP CAL control fully CW.
Step 7. Apply current to the relay.
Step 8. Slowly adjust the front panel TAP CAL control CCW until the front panel TIMING indicator just

illuminates which indicates the desired time overcurrent pickup point for phase sensing. For

Tests and Adjustments BE1-51

9137200997 Rev G 45

Note

Note

Note

relays with two-phase-and-neutral, three-phase, or three-phase-and-neutral sensing, this

pickup point will be the same for all the phases.
Step 9. Remove input current.

For relays with two-phase-and-neutral or three-phase-and-neutral
sensing (Sensing Input Types I or V), perform Steps 10 through 15.
Otherwise, the time overcurrent pickup point calibration ends here
(unless instantaneous 1 or 2 overcurrent calibration is to be performed
later in these procedures).

Step 10. Reconnect the test set output to the neutral sense terminals. See Figures 26 or 27.
Step 11. Adjust the current to the desired time overcurrent pickup point for the relay.
Step 12. Set the front panel TAP (NEUTRAL) selector to the closest setting above the desired pickup

point.
Step 13. Rotate the front panel CAL (NEUTRAL) control fully CW.
Step 14. Slowly adjust the front panel CAL (NEUTRAL) control CCW until the front panel TIMING

(NEUTRAL) indicator just illuminates to establish the desired time overcurrent pickup point for

neutral sensing.
Step 15. Remove input current.

Pickup point calibration ends here.

Time Overcurrent Curve Selection (Timing Type Z1, Z2, and Z3 Only)

Step 1. Remove the relay cradle front cover to gain access to the logic board time overcurrent

characteristic curve selector.
Step 2. Remove the Phillips screws from both sides of the unit and remove the front panel. See the

Controls and Indicators chapter for the location of the logic board and curve selector.
Step 3. Select the desired curve. See the Time Overcurrent Characteristic Curves chapter for the

desired curve and selector position.
Step 4. Re-insta ll the front pan el an d the front cover .

Time Delay Selection

If Timing Type Z1, Z2, or Z3 is installed, refer to time overcurrent
curve selection to obtain the desired set of time overcurrent curves
(see the Time Overcurrent Characteristic Curves chapter). Then
proceed to Step 1, following.

If Timing Type Z1, Z2, or Z3 is not installed, determine the timing type
from the model and style number for a specific relay. Then select the
appropriate timing curve (see the Time Overcurrent Characteristic
Curves chapter). Proceed to the following, Step 1.

BE1-51 Tests and Adjustments

46 9137200997 Rev G

Note

Step 1. Referring to the appropriate time overcurrent characteristic curve, select the desired time delay

on the front panel TIME DIAL for the anticipated input overcurrent difference (multiples-of-

pickup current) from the selected time overcurrent pickup point as follows:
(Selected Pick up Po int) - (Anticipated Input Overcurrent) = Overcurrent Difference from Pickup
Step 2. Set the front panel TIME DIAL as follows:

(a) On the appropriate curve, plot upward from the multiples-of-pickup-current value until the

horizontal line opposite the desired ti me delay (time-in-seconds) is reached. The setting
curve nearest the plot point should then be entered on the front panel TIME DIAL.

(b) Using the timing type B3, Definite Time Curve in the Time Overcurrent Characteristic

Curves chapter as an example, if the overcurrent is expected to be 4 times the pickup point
value and time delay of 4 seconds is desired, plot upward from the point 4 on the
multiples-of-pickup-current axis until the point 4 from the time-in-seconds axis is
crossed. The curve for a setting of 52 crosses the plot point and should be entered on the
front panel TIME DIAL.

(c) For a lesser overcurrent difference from the pickup point, the time delay will be greater, so

that for a multiple of 3 times the pickup current, the time delay for the previous front panel
setting of 52 will be 5.8 seconds.

Neutral Time Delay Selection

Step 1. Use the same characteristic curve used in the previous paragraph (Time Delay Selection).

However, the multiples-of-pickup current, time-in-seconds, and the resulting front panel

NEUTRAL TIME DIAL setting can differ.
Step 2. Set the front panel NEUTRAL TIME DELAY as follows:

(a) On the appropriate curve, plot upward from the multiples-of-pickup-current value until the

horizontal line opposite the desired ti me delay (time-in-seconds) is reached. The setting
curve nearest the plot point should then be entered on the front panel NEUTRAL TIME
DELAY.

(b) Using the timing type B3, Definite Time Curve in the Time Overcurrent Characteristic

Curves chapter as an example, if the overcurrent is expected to be 4 times the pickup point
value and time delay of 4 seconds is desired, plot upward from the point 4 on the
multiples-of-pickup-current axis until the point 4 from the time-in-seconds axis is
crossed. The curve for a setting of 52 crosses the plot point and should be entered on the
front panel NEUTRAL TIME DIAL.

(c) For a lesser overcurrent difference from the pickup point, the time delay will be greater, so

that for a multiple of 3 times the pickup current, the time delay for the previous front panel
setting of 52 will be 5.8 seconds.

INST 1 Control Setting

Because the lower limit for this pickup is determined by the front panel
TAP selector setting and the front panel TAP (CAL) control position,
ensure that these adjustments have been performed as in the
paragraph TAP and TAP (NEUTRAL) Selector Setting.

Step 1. Verify that the test setup is as described in TAP and TAP (NEUTRAL) Selector Setting, Steps 1

through 6.
Step 2. Connect the test setup to the instantaneous 1 element output terminals (2 and 10) as shown in

Figures 24 through 27. The timer should not be connected.
Tests and Adjustments BE1-51

9137200997 Rev G 47

Caution

INST 1, INST 1 (NEUTRAL)

INST 2

Note

Steps 3 through 8 provide the application of overcurrent for short
periods to allow adjustment while avoiding overheating of the input
sensing transformers. To avoid damaging the relay, do not attempt to
apply a constant high level of input current for adjustment of the front
panel

Step 3. Set the front panel INST 1 control to a position approximating the desired instantaneous 1

overcurrent pickup point for the relay.
Step 4. Apply current to the relay.
Step 5. Rapidly increase the overcurrent input to the relay until the instantaneous output relay just

energizes. Note the overcurrent threshold reading on the ammeter.
Step 6. Remove input current.
Step 7. Reset the INST TARGET (if present).
Step 8. If the overcurrent threshold reading from Step 5 was too high or low, adjust the front panel INST

1 contr ol CCW to l ower (or CW to raise) the inst antaneous 1 overc urrent pickup point. Repeat

Steps 4 through 8. If the overc urrent threshold reading from St ep 5 was NOT too high or low,

proceed to Step 9.

, or

controls.

For relays with two-phase-and-neutral or three-phase-and-neutral
sensing (Sensing Input Types I or X), perform Steps 9 through 14.

Step 9. Reconnect the output to the neutral current sense terminals. See Figures 26 or 27.
Step 10. Set the front panel INST 1 (NEUTRAL) control to a position approximating the desired neutral

instantaneous 1 overcurrent pickup point for the relay.
Step 11. Apply current to the relay.
Step 12. Rapidly increase the overcurrent input to the relay until the instantaneous output relay just

energizes. Note the test set overcurrent threshold reading on the ammeter.
Step 13. Remove the input current.
Step 14. Reset the INST TARGET (if present).
Step 15. If the overcurrent threshold reading from Step 13 was too high or low, adjust the front panel

INST 1 (NEUTRAL) control CCW to lower (or CW to raise) the Neutral Instantaneous 1

Overcurrent Pickup Point. Repeat Steps 9 through 14. If NOT, proceed to the next test.

INST 2 Control Setting

For this adjustment, repeat INST 1 Control Setting, but substitute instantaneous 2 output terminals (11
and 12) and the front panel INST 2 controls. Because neutral sensing does not apply to this pickup point,
ignore Steps 9 through 15.

BE1-51 Tests and Adjustments

48 9137200997 Rev G

Tests and Adjustments BE1-51

9137200997 Rev G 49

Specifications

BE1-51 Time Overcurrent Relays electrical and physical specifications are described below.

Operational Specifi c a ti ons

Time Overcurrent Pickup Selection Range

Continuously adjustable over the current sensing input ranges specified in the style chart.

Time Overcurrent Measuring Accuracy

±2% of pickup setting.
When the TAP CAL control is fully CW, the actual pickup will be within ±5% of the front panel TAP

selector setting.

Time Overcurrent Dropout Ratio

Better than 92% of pickup level.

Instantaneous Overcurrent Pickup Range

Continuously adjustable over the range of 1 to 40 times the time overcurrent pickup setting.

Instantaneous Overcurrent Measuring Accuracy

±2% of pickup setting.

Instantaneous Overcurrent Dropout Ratio

Better than 98% of pickup level.

Instantaneous Response

Figure 28 shows the typical response for the instantaneous pickup element.

Figure 28. Typical Instantaneous Response Time

BE1-51 Specifications

50 9137200997 Rev G

Input Voltage

Nominal

Range

O (mid-range)

48 Vdc

24 to 150 Vdc

1.6 W

125 Vdc
120 Vac

24 to 150 Vdc
90 to 132 Vac

1.9 W

8.9 VA

R (low-range)

24 Vdc

12 to 32 Vdc *

1.7 W

48 Vdc

125 Vdc

24 to 150 Vdc
24 to 150 Vdc

1.6 W

1.9 W

250 Vdc
240 Vac

68 to 280 Vdc
90 to 270 Vac

2.1 W

14.2 VA

Time Delay Accuracy

±5% of the characteristic curve for any combination of the front panel TIME DIAL setting and the front
panel TAP/TAP CAL overcurrent pickup setting. Refer to the Time Overcurrent Characteristic Curves
chapter for more information.

Repeatability is within ±2% of setting at 25°C.

General Specifications

Sensing Input Burden

Less than 0.1 ohms per phase or neutral.

Sensing Input Rating

The maximum continuous rating is 20 A, 1 second current rating is 50X (times) the maximum tap current
selected, or 500 A, whichever is less. For ratings other than those specified by the time curves, the rating
is calculated as follows:

50 × 𝑡𝑎𝑝 𝑜𝑟 500 𝐴 (𝑤ℎ𝑖𝑐ℎ𝑒𝑣𝑒𝑟 𝑖𝑠 𝑙𝑒𝑠𝑠

𝐼 =

I = Maximum current
T = Time that current flows (in seconds)

𝑇

√

)

Output Circuits

Resistive Ratings

120 Vac ............ Make, break, and carry 7 Aac continuously

250 Vdc ............ Make and carry 30 Adc for 0.2 s, carry 7 Adc continuously, and break 0.3 Adc

500 Vdc ............ Make and carry 15 Adc for 0.2 s, carry 7 Adc continuously, and break 0.3 Adc

Inductive Ratings

120 Vac, 125 Vdc, 250 Vdc........ Break 0.3 A (L/R = 0.04)

Power Supply

Power for the internal circuitry may be derived from a variety of ac or dc external power sources as
indicated in Table 4.

Table 4. Power Supply Specifications

Type

P (mid-range)

S (mid-range)

Burden at Nominal

T (high-range)

* Type R power supply may require 14 Vdc to begin operation. Once operating, the voltage may be
reduced to 12 Vdc.

Specifications BE1-51

9137200997 Rev G 51

Target Indicators

Function targets may be specified as either internally operated or current operated by a minimum of 0.2
amperes through the output trip circuit. When current operated, the output circuit must be limited to 30
amperes for 0.2 seconds, 7 amperes for 2 minutes, and 3 amperes continuously.

Radio Frequency Interference (RFI)

Field-tested using a five-watt, hand-held transceiver operating at random frequencies centered around
144 MHz and 440 MHz, with the antenna located six inches from the relay in both horizontal and vertical
planes.

Isolation

In accordance with IEC 255-5 and ANSI/IEEE C37.90, one-minute dielectric (high potential) tests as
follows:

All circuits to ground ........................ 2,121 Vdc

Input to output circuits ..................... 1,500 Vac or 2,121 Vdc

Surge Withstand Capability

Qualified to ANSI/IEEE C37.90.1-1989, Standard Surge Withstand Capability (SWC) Tests for Protective
Relays and Relay Systems.

UL Recognized

UL recognized per Standard 508, UL File No. E97033. Note: Output contacts are not UL recognized for
voltages greater than 250 volts and input power supply voltages greater than 150 volts.

GOST-R

GOST-R certified per the relevant standards of Gosstandart of Russia.

Operating Temperature

The operating temperature r ange is from −40°C (−40°F) to +70°C (+158°F).

Storage Temperature

The storage temperature range is from −65°C (−85°F) to +100°C (+212°F).

Shock

In standard tests, the relay has withstood 15 g in each of three mutually perpendicular planes without
structural damage or degradation of performance.

Vibration

In standard tests, the relay has withstood 2 g in each of three mutually perpendicular planes, swept over
the range of 10 to 500 Hz for six sweeps, 15 minutes each sweep without structural damage or
degradation of performance.

Weight

Single-Phase ................................... 13.0 lbs. (5.90 kg)

Two-Phase and Neutral .................. 14.0 lbs. (6.35 kg)

Three-Phase ................................... 14.0 lbs. (6.35 kg)

Three-Phase and Neutral ................ 14.4 lbs. (6.53 kg)

Case Size

S1 (Refer to the Installation chapter for case dimensions.)
BE1-51 Specifications

52 9137200997 Rev G

Specifications BE1-51

9137200997 Rev G 53

Timing Choices

Z1

Z2

Z3 (Integrating)

Short Inverse

Short Inverse

Short Inverse

Long Inverse

Long Inverse

Long Inverse

Definite Time

Definite Time

Definite Time

Moderately Inverse

Moderately Inverse

Moderately Inverse

Inverse Time

Inverse Time

Inverse Time

Very Inverse

Very Inverse

Very Inverse

Extremely Inverse

Extremely Inverse

Extremely Inverse

I2t

BS 142 Long Inverse

I2t

I2t with Limit 1

BS142 Inverse

I2t with Limit 1

I2t with Limit 2

BS142 Inverse

I2t with Limit 2

I2t with Limit 3

BS142 Very Inverse

I2t with Limit 3

I2t with Limit 4

BS142 Extremely Inverse

I2t with Limit 4

I2t with Limit 5

N/A

I2t with Limit 5

I2t with Limit 6

N/A

I2t with Limit 6

I2t with Limit 7

N/A

I2t with Limit 7

I2t with Limit 8

N/A

I2t with Limit 8

Time Overcurrent Characteristic Curves

Graphs on the following pages illustrate sample characteristic curves for all of the time overcurrent
functions individually as options, or selectable by switch (if the Z1, Z2, or Z3 timing option is specified). Z1
option can select any of the timing types designated as B1 through B8, and C1 through C8. Z2 option can
select any of the timing types designated as B1 through B8, and the British Standard timing types: E2,
E4, E5, E6, and E7. Z3 option can select the integrating algorithm for any of the timing types designated
as B1 through B8, and C1 through C8.

Note that there are two versions of each timing type: standard and extended timing. Both types are
located on the same page. The exception to this is the British Standard curves, which do not have an
extended timing version. For any given relay, either the standard or the extended range version will apply,
never both.

Table 5 lists timing choices with available curves. Table 6 lists the positions of the timing curve selector
switch. (See the Controls and Indicators chapter for switch location).

Table 5. Timing Choices with Available Curves

Available Curves

BE1-51 Time Overcurrent Characteristic Curves

54 9137200997 Rev G

Standard

Fig. No.

Extended

Fig. No.

Standard

Fig. No.

Extended

Fig. No.

B1 - Short Inverse

3 3 A-1

A-2

A-38

A-39

B2 - Long Inverse

1 1 A-3

A-4

A-40

A-41

B3 - Definite Time

5 5 A-5

A-6

A-42

A-43

B4 - Moderately Inverse

2 2 A-7

A-8

A-44

A-45

B5 - Inverse

4 4 A-9

A-10

A-46

A-47

B6 - Very Inverse

6 6 A-11

A-12

A-48

A-49

B7 - Extremely Inverse

7 7 A-13

A-14

A-50

A-51

B8 - I2t 0 0

A-15

A-16

A-52

A-53

C1 - I2t with Limit #1

8 — A-17

A-18

A-54

A-55

C2 - I2t with Limit #2

9 — A-19

A-20

A-56

A-57

C3 - I2t with Limit #3

A — A-21

A-22

A-58

A-59

C4 - I2t with Limit #4

B — A-23

A-24

A-60

A-61

C5 - I2t with Limit #5

C — A-25

A-26

A-62

A-63

C6 - I2t with Limit #6

D — A-27

A-28

A-64

A-65

C7 - I2t with Limit #7

E — A-29

A-30

A-66

A-67

C8 - I2t with Limit #8

F — A-31

A-32

A-68

A-69

E2 - Long Inverse

— 8 A-33 — —

—

E4 - Inverse

— 9 A-34 — —

—

E5 - Inverse

— A A-35 — —

—

E6 - Very Inverse

— B A-36 — —

—

E7 - Extremely Inverse

—

C,D,E,F

A-37 — —

—

Table 6. Timing Curve Selection Table

Timing Type

Selector
Position

Z1, Z3

Selector
Position

Z2

Curves

Z1, Z2

Curves

Z1, Z2

Curves

Z3

Curves

Z3

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 55

P0049-02

1.5

P0049-03

1.5

Figure 29. Timing Type B1, Short Inverse

Figure 30. Timing Type B1, Short Inverse with

Extended Timing Range

BE1-51 Time Overcurrent Characteristic Curves

56 9137200997 Rev G

P

004

9-04

P0049-05

Figure 31. Timing Type B2, Long Inverse

Time Overcurrent Characteristic Curves BE1-51

Figure 32. Timing Type B2, Long Inverse

with Extended Timing Range

9137200997 Rev G 57

P0049-06

P0049-07

Figure 33. Timing Type B3, Definite Time

Figure 34. Timing Type B3, Definite Time with

Extended Timing Range

BE1-51 Time Overcurrent Characteristic Curves

58 9137200997 Rev G

P0049-08

P

00

49-09

Figure 35. Timing Type B4, Moderately Inverse

Figure 36. Timing Type B4, Moderately Inverse

with Extended Timing Range

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 59

P0049-10

P0049-10

Figure 37. Timing Type B5, Inverse

Figure 38. Timing Type B5, Inverse

with Extended Timing Range

BE1-51 Time Overcurrent Characteristic Curves

60 9137200997 Rev G

P0049-12

P0049-13

Figure 39. Timing Type B6, Very Inverse

Figure 40. Timing Type B6, Very Inverse with

Extended Timing Range

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 61

P0049-14

P0049-15

Figure 41. Timing Type B7, Extremely Inverse

Figure 42. Timing Type B7, Extremely Inverse with

Extended Timing Range

BE1-51 Time Overcurrent Characteristic Curves

62 9137200997 Rev G

P0049-16

P0049-17

Figure 43. Timing Type B8, I2t

Figure 44. Timing Type B8, I2t

with Extended Timing Range

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 63

P0049-18

P0

04

9

-1

9

Figure 45. Timing Type C1, I2t with Limit #1

Figure 46. Timing Type C1, I2t with Limit #1 and

Extended Timing Range

BE1-51 Time Overcurrent Characteristic Curves

64 9137200997 Rev G

P0049-20

P0049-21

Figure 47. Timing Type C2, I2t with Limit #2

Figure 48. Timing Type C2, I2t with Limit #2 and

Extended Timing Range

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 65

P0049-22

P0049-23

Figure 49. Timing Type C3, I2t with Limit #3

Figure 50. Timing Type C3, I2t with Limit #3 and

Extended Timing Range

BE1-51 Time Overcurrent Characteristic Curves

66 9137200997 Rev G

P00

49

-

24

P0049-25

Figure 51. Timing Type C4, I2t with Limit #4

Figure 52. Timing Type C4, I2t with Limit #4 and

Extended Timing Range

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 67

P0049-26

P

0

04

9-

2

7

Figure 53. Timing Type C5, I2t with Limit #5

Figure 54. Timing Type C5, I2t with Limit #5 and

Extended Timing Range

BE1-51 Time Overcurrent Characteristic Curves

68 9137200997 Rev G

P0049-28

P0049-29

Figure 55. Timing Type C6, I2t with Limit #6

Figure 56. Timing Type C6, I2t with Limit #6 and

Extended Timing Range

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 69

P

004

9-3

0

P0049-31

Figure 57. Timing Type C7, I2t with Limit #7

Figure 58. Timing Type C7, I2t with Limit #7 and

Extended Timing Range

BE1-51 Time Overcurrent Characteristic Curves

70 9137200997 Rev G

P00

49-3

2

P

0

04

9-

3

3

Figure 59. Timing Type C8, I2t with Limit #8

Figure 60. Timing Type C8, I2t with Limit #8 and

Extended Timing Range

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 71

P0049-34

P0049-35

Figure 61. Timing Type E2,

BS 142 Long Inverse

Figure 62. Timing Type E4,

BS 142 Inverse

BE1-51 Time Overcurrent Characteristic Curves

72 9137200997 Rev G

P0049-36

P0049-37

Figure 63. Timing Type E5,

BS 142 Inverse

Figure 64. Timing Type E6,

BS 142 Very Inverse

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 73

P0049-38

P0049-39

Figure 66. Timing Type B1, Short Inverse

with Integrated Algorithm

Figure 65. Timing Type E7,

BS 142 Extremely Inverse

BE1-51 Time Overcurrent Characteristic Curves

74 9137200997 Rev G

P0

049-

40

P0049-41

Figure 67. Timing Type B1, Short Inverse with

Integrated Algorithm and Extended Timing

Figure 68. Timing Type B2, Long Inverse

with Integrated Algorithm

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 75

P

004

9-42

P0049-43

Figure 69. Timing Type B2, Long Inverse with

Integrated Algorithm and Extended Timing

BE1-51 Time Overcurrent Characteristic Curves

Figure 70. Timing Type B3, Definite Time

with Integrated Algorithm

76 9137200997 Rev G

P

0

04

9-

4

4

P0049-45

Figure 71. Timing Type B3, Definite Time with

Integrated Algorithm and Extended Timing

Figure 72. Timing Type B4, Moderately Inverse

with Integrated Algorithm

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 77

P0049-46

P0049-47

Figure 73. Timing Type B4, Moderately Inverse

with Integrated Algorithm

and Extended Timing

Figure 74. Timing Type B5, Inverse with Integrated

Algorithm

BE1-51 Time Overcurrent Characteristic Curves

78 9137200997 Rev G

P00

49-

48

P0049-49

Figure 75. Timing Type B5, Inverse with Integrated

Algorithm and Extended Timing

Figure 76. Timing Type B6, Very Inverse

with Integrated Algorithm

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 79

P

0049

-50

P0049-51

Figure 77. Timing Type B6, Very Inverse with

Integrated Algorithm and Extended Timing

Figure 78. Timing Type B7, Extremely Inverse with

Integrated Algorithm

BE1-51 Time Overcurrent Characteristic Curves

80 9137200997 Rev G

P0049-52

P0049-53

Figure 79. Timing Type B7, Extremely Inverse with

Integrated Algorithm

and Extended Timing

Figure 80. Timing Type B8, I2t

with Integrated Algorithm

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 81

P0049-54

P0049-55

Figure 81. Timing Type B8, I

Algorithm and Extended Timing

t with Integrated

Figure 82. Timing Type C1, I2t Limit #1

with Integrated Algorithm

2

BE1-51 Time Overcurrent Characteristic Curves

82 9137200997 Rev G

P0049-56

P

0

04

9-

5

7

Figure 83. Timing Type C1, I2t Limit #1

with Integrated Algorithm

Figure 84. Timing Type C2, I2t Limit #2

with Integrated Algorithm

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 83

P0

04

9

-5

8

P

00

4

9-

59

Figure 85. Timing Type C2, I2t Limit #2 with
Integrated Algorithm and Extended Timing

Figure 86. Timing Type C3, I2t Limit #3

with Integrated Algorithm

BE1-51 Time Overcurrent Characteristic Curves

84 9137200997 Rev G

P0049-60

P0049-61

Figure 87. Timing Type C3, I2t Limit #3 with
Integrated Algorithm and Extended Timing

Figure 88. Timing Type C4, I2t Limit #4

with Integrated Algorithm

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 85

P0049-62

P0049-63

Figure 89. Timing Type C4, I2t Limit #4 with
Integrated Algorithm and Extended Timing

Figure 90. Timing Type C5, I2t Limit #5

with Integrated Algorithm

BE1-51 Time Overcurrent Characteristic Curves

86 9137200997 Rev G

P00

49-

64

P0049-65

Figure 91. Timing Type C5, I2t Limit #5 with
Integrated Algorithm and Extended Timing

Figure 92. Timing Type C6, I2t Limit #6

with Integrated Algorithm

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 87

P0049-66

P

0

04

9

-6

7

Figure 93. Timing Type C6, I2t Limit #6 with
Integrated Algorithm and Extended Timing

Figure 94. Timing Type C7, I2t Limit #7

with Integrated Algorithm

BE1-51 Time Overcurrent Characteristic Curves

88 9137200997 Rev G

P0049-68

P0049-69

Figure 95. Timing Type C7, I2t Limit #7 with
Integrated Algorithm and Extended Timing

Figure 96. Timing Type C8, I2t Limit #8

with Integrated Algorithm

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 89

P0049-70

Figure 97. Timing Type C8, I2t Limit #8 with Integrated Algorithm and Extended Timing

BE1-51 Time Overcurrent Characteristic Curves

90 9137200997 Rev G

Time Overcurrent Characteristic Curves BE1-51

9137200997 Rev G 91

Manual

—, Jul-92

• Initial release

A, Feb-93

• Added

B, Sep-93

• Added Figures 4-4 and 4-6 through 4-9

Corrected minor typographical errors

C, Jan-98

• Changed paragraph styles to new manual design

D, Aug-07

• Updated Output Contacts ratings in Section 1

E, Jul-10

• Replaced cover drawing and Figure 2-1. (New front panel switches

and graphics.)

F, May-12

• Updated locations of Curve Selector and Normal/Test switches

Revision History

Table 7 provides a historical summary of the changes made to this instruction manual. Revisions are
listed in chronological order.

Table 7. Manual Revision History

Revision and Date

Change

• Restructured Section 5, Operational Test

•

• Added Note 3 to Figure 1-1

• Corrected inductive output specification from 0.1 to 0.3 A

• Changed TOC specification

• Added instantaneous response time with graph 1-1

• Deleted specification reference to field selectable switch in Type S

power supply

• Corrected weight in kilograms for all case styles

• Replaced Figure 1-49 wit h c orr ec t curv e

• Corrected Figure 1-51

• Added multiturn potentiometer description to controls in Table 2-1

• Corrected Range 9 entries in Table 2-2

• Changed “Element D” in Table 2-4 to “Element N”

• Deleted Figure 3-1

• Revised the power supply functional description to accommodate

new wide range power supplies

• Corrected Figures 4-2, 4-3, and 4-4

• Deleted Figure 4-5

• Moved content of Section 6, Maintenance to Section 4

• Updated front-panel illustrations to show laser graphics

BE1-51 Revision History

• Moved content of Section 7, Manual Change Information to

manual introduction

• Added manual part number and revision to all footers

• Updated cover drawing

• Moved Time Overcurrent Characteristic Curves from Section 1 to

new Appendix A

• Updated power supply burden data in Secti on 1

• Updated Target Indicator description in Section 3

• Minor text edits

• Replaced Figures 4-1 through 4-5 and added Figures 4-6 through

4-12. (For consistency between manuals of this product line.)

92 9137200997 Rev G

Manual

Revision and Date

G, Mar-15

• Updated manual to latest style

Change

• Minor text edits throughout manual

Revision History BE1-51

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