Basler Electric BE1-50/51B-237 User Manual

INSTRUCTION MANUAL

FOR

OVERCURRENT RELAYS

BE1-50/51B-237 and BE1-50/51B-238

Publication: 9252000899

Revision: B 12/11

INTRODUCTION

This instruction manual provides information about the operation and installation of the BE1-50/51B-237
and BE1-50/51B-238 Overcurrent Relays. To accomplish this, the following information is provided:

 General Information and Specifications
 Controls and Indicators
 Functional Description
 Installation and Maintenance
 Testing

WARNING!

To avoid personal injury or equipment damage, only qualified personnel should
perform the procedures in this manual.

9252000899 Rev B BE1-50/51B-237/-238 Introduction i

First Printing: April 2008

Printed in USA

© 2008-2011 Basler Electric, Highland Illinois 62249 USA

All Rights Reserved

December 2011

CONFIDENTIAL INFORMATION

of Basler Electric, Highland Illinois, USA. It is loaned for confidential use,
subject to return on request, and with the mutual understanding that it will not
be used in any manner detrimental to the interest of Basler Electric.

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 and options are subject to modification without notice. Should further information be
required, contact Basler Electric.

BASLER ELECTRIC

12570 STATE ROUTE 143

HIGHLAND IL 62249 USA

http://www.basler.com, [e-mail]

PHONE [phone] FAX [phone]

ii BE1-50/51B-237/-238 Introduction 9252000899 Rev B

REVISION HISTORY

The following information provides a historical summary of the changes made to this instruction manual
(9252000899). Revisions are listed in reverse chronological order.

Manual

Revision and Date

B, 12/11

A, 01/09

—, 04/08

 Made changes to reflect that a new connection plug is included with

 Updated year of IEEE C37.90 specifications in Section 1.
 Improved description of Locator B (Active/Pickup LED) in Table 2-1.

 Removed notes about hard-wiring relay case to ground since relay is

 Added GOST-R Certification in Section 1.
 Updated Storage statement in Section 4.
 Modified Figures 5-3 and 5-6, Target Indicator Test Setup.
 Minor text edits in Section 5.

 Initial release

the relay.

a direct replacement, i.e. not shipped with a case.

Change

9252000899 Rev B BE1-50/51B-237/-238 Introduction iii

iv BE1-50/51B-237/-238 Introduction 9252000899 Rev B

CONTENTS

SECTION 1 • GENERAL INFORMATION ................................................................................................ 1-1

SECTION 2 • CONTROLS AND INDICATORS ........................................................................................ 2-1

SECTION 3 • FUNCTIONAL DESCRIPTION ........................................................................................... 3-1

SECTION 4 • INSTALLATION .................................................................................................................. 4-1

SECTION 5 • TESTING ............................................................................................................................ 5-1

APPENDIX A • CHARACTERISTIC CURVES ......................................................................................... A-1

9252000899 Rev B BE1-50/51B-237/-238 Introduction v

vi BE1-50/51B-237/-238 Introduction 9252000899 Rev B

SECTION 1 • GENERAL INFORMATION

TABLE OF CONTENTS

SECTION 1 • GENERAL INFORMATION ................................................................................................ 1-1

Introduction ............................................................................................................................................ 1-1

Features ................................................................................................................................................. 1-1

Specifications ......................................................................................................................................... 1-2

Time Overcurrent (51) Element .......................................................................................................... 1-2

Instantaneous Overcurrent A (50-A) Element .................................................................................... 1-2

Instantaneous Overcurrent B (50-B) Element .................................................................................... 1-3

Current Sensing Input ........................................................................................................................ 1-3

Frequency Response ......................................................................................................................... 1-5

Transient Response ........................................................................................................................... 1-5

Harmonic Rejection ............................................................................................................................ 1-5

Target Indicators ................................................................................................................................ 1-6

Output Contacts ................................................................................................................................. 1-6

Type Tests .......................................................................................................................................... 1-7

Environment ....................................................................................................................................... 1-7

GOST-R Certification ......................................................................................................................... 1-7

Physical .............................................................................................................................................. 1-7

Figures

Figure 1-1. Current Sensing Input Derating Curve (BE1-50/51B-237) ...................................................... 1-3

Figure 1-2. Current Sensing Input Derating Curve (BE1-50/51B-238)
Figure 1-3. Current Sensing Input Burden (BE1-50/51B-237)
Figure 1-4. Current Sensing Input Burden (BE1-50/51B-238)
Figure 1-5. Harmonic Rejection

...................................................... 1-4

.................................................................. 1-4

.................................................................. 1-5

................................................................................................................. 1-6

Tables

Table 1-1. GE IAC Relays Suitable For Direct Replacement .................................................................... 1-1

9252000899 Rev B BE1-50/51B-237/-238 General Information i

ii BE1-50/51B-237/-238 General Information 9252000899 Rev B

SECTION 1 • GENERAL INFORMATION

Introduction

BE1-50/51B-237 and BE1-50/51B-238 protective relays are direct replacements for General Electric, IAC
relays. The BE1-50/51B-237 has a 5-ampere current sensing input. The BE1-50/51B-238 has a 1-ampere
current sensing input. Compatible IAC model numbers are listed in Table 1-1.

Table 1-1. GE IAC Relays Suitable For Direct Replacement

IAC Model Number Curve Type

12IAC51A∗∗∗A

12IAC51B∗∗∗A

12IAC53A∗∗∗A

12IAC53B∗∗∗A

12IAC55A∗∗∗A

12IAC55B∗∗∗A

12IAC66A∗∗A

12IAC66B∗∗A

12IAC77A∗∗∗A

12IAC77B∗∗∗A

∗ Any digit covering all pickup ranges and 50 Hz or 60 Hz models.

Inverse

Inverse with Instantaneous

Very Inverse

Very Inverse with Instantaneous

Short Time

Short Time with Instantaneous

Long Time

Long Time with Instantaneous

Extremely Inverse

Extremely Inverse with Instantaneous

To replace an existing IAC relay, perform the following steps.

1. Select the desired relay settings on your new BE1-50/51B-237 or BE1-50/51B-238 relay.

2. Remove the existing IAC relay.

3. Attach the cover adapter to the existing case.

4. Insert the new relay.

5. Install the new Basler Electric connection plug.

6. Install the new Basler Electric cover.

BE1-50/51B-237 and BE1-50/51B-238 relays are self-powered, compatible with 50 or 60 Hz power
systems, and have three protection elements: one time overcurrent (51) element and two instantaneous
overcurrent (50) elements. The 51 element offers timing characteristic curves similar to those used by GE
IAC and ABB relays.

Features

A wide range of pickup settings and front panel selectable time characteristics permit applications
involving coordination with fuses, reclosers, cold load pickup, motor starting, and fixed time requirements.
In addition, an integrating reset function is available to simulate the disk reset of electromechanical relays.

BE1-50/51B-237 and BE1-50/51B-238 overcurrent relays have the following standard features.

• Independent time and instantaneous elements

• A secure method to manually trip the breaker at the relay front panel

• Direct reading front panel controls

• Minimum pickup setting for safety during installation

• Time characteristics extend to a pickup multiple of 40

• Rugged draw-out construction with steel case

• Gravity latching targets retain indication without power

• Built-in accuracy eliminates internal adjustments

• Minimum transient overreach

• Field selectable characteristic curve selection similar to either GE IAC or ABB type curves

• Field selectable instantaneous or integrating reset

• Field selectable 50 or 60 Hz operation

• Field selectable 0.0 or 0.1 second, fixed, instantaneous delay

9252000899 Rev B BE1-50/51B-237/-238 General Information 1-1

Internal switches provide for selecting system-operating frequencies of 50 or 60 Hz, instantaneous
element delays of 0.0 or 0.1 second, characteristic curve group selection for either GE IAC or ABB type
curves, and instantaneous or integrating reset characteristics. Switch location and description is provided
in Section 2.

Specifications

BE1-50/51B-237 and BE1-50/51B-238 electrical and physical specifications are listed in the following
paragraphs.

Time Overcurrent (51) Element

BE1-50/51B-237 Pickup

Setting Range ............................ 0.5 to 15.9 Aac

Setting Increment ....................... 0.1 Aac

Accuracy .................................... Sum of ±2% and ±25 mAac

BE1-50/51B-238 Pickup

Setting Range ............................ 0.1 to 3.18 Aac

Setting Increment ....................... 0.02 Aac

Accuracy .................................... Sum of ±2% and ±5 mAac

Dropout

Dropout occurs at 95% of pickup value.

Characteristic Curves

Available curve types follow IEEE Standard C37.112 (1996) and emulate standard GE IAC, ABB CO, and
BS142 curves. Appendix A, Characteristic Curves illustrates the available curves and lists the applicable
constants.

Curve Types .............................. Short Inverse, Long Inverse, Definite Time, Moderately Inverse, Inverse,

Very Inverse, Extremely Inverse, BS142 Very Inverse, BS142 Extremely

Inverse, Fixed Time

Time Multiplier ........................... 11 curves for each characteristic

Timing Accuracy ........................ ±1 cycle, ±2%. This accuracy applies to the range of 1.3 to 40 times tap

and is for a given measured multiple of tap.

Fixed Timing

Setting Range ............................ 0.1 to 9.9 s

Setting Increment ....................... 0.1 s

Timing Accuracy ........................ ±1 cycle, ±2% of the time to trip for time dial settings ≥0.1.

Reset

Integrating .................................. Simulates the disk reset of electromechanical relays and begins when

the current decreases below 95% of pickup. Appendix A, Characteristic

Curves illustrates the integrating reset characteristic curve and equation.

Instantaneous ............................ Reset occurs within 16 ms of when the current decreases below 95% of

the pickup level.

Instantaneous Overcurrent A (50-A) Element

BE1-50/51B-237 Pickup

Setting Range ............................ 2 to 99 Aac

Setting increment ....................... 1 Aac

Accuracy .................................... Sum of ±2% and ±25 mAac

BE1-50/51B-238 Pickup

Setting Range ............................ 0.4 to 19.8 Aac

Setting increment ....................... 0.2 Aac

Accuracy .................................... Sum of ±2% and ±5 mAac

1-2 BE1-50/51B-237/-238 General Information 9252000899 Rev B

Dropout

Continuous Current

Current Sensing Input

0

2

4

6

8

10

12

14

16

-40 -20 0 20 40 60

Ambient Temperature (C)

Current (Aac)

Dropout occurs at 95% of pickup value.

Time Delay

Switch selectable—no intentional delay (SW3-2 open/off) or a fixed delay of 100 ms (SW3-2 closed/on).
Appendix A, Characteristic Curves illustrates the characteristic curve for the 50-A and 50-B elements.

Instantaneous Overcurrent B (50-B) Element

BE1-50/51B-237 Pickup

Setting Range ............................ 1 to 15.9 Aac

Setting increment ....................... 0.1 Aac

Accuracy .................................... Sum of ±2% and ±25 mAac

BE1-50/51B-238 Pickup

Setting Range ............................ 0.2 to 3.18 Aac

Setting increment ....................... 0.02 Aac

Accuracy .................................... Sum of ±2% and ±5 mAac

Dropout

Dropout occurs at 95% of pickup value.

Time Delay

Fixed at no intentional delay. Appendix A, Characteristic Curves illustrates the characteristic curve for the
50-A and 50-B elements.

Reset Characteristic

Resets within 16 ms of when sensed current decreases below the pickup level.

Current Sensing Input

BE1-50/51B-237

Continuous Rating ..................... 14 Aac∗

1 Second Rating ........................ 400 Aac

∗ Continuous rating is 14 Aac for temperatures up to 45°C. See Figure 1-1 for derating curve.

Figure 1-1. Current Sensing Input Derating Curve (BE1-50/51B-237)

9252000899 Rev B BE1-50/51B-237/-238 General Information 1-3

BE1-50/51B-238

Continuous Current

Current Sensing Input

0

0.4

0.8

1.2

1.6

2

2.4

2.8

3.2

-40 -20 0 20 40 60

Ambient Temperature (C)

Current (Aac)

BE1-50/51B-230 CT Burden

0

20

40

60

80

100

120

140

160

0 10 20 30 40 50

Input Current (Amps)

Burden in VA (rms)

BE1-50/51B-237 CT Burden

Continuous Rating ..................... 2.8 Aac∗

1 Second Rating ........................ 80 Aac

∗ Continuous rating is 2.8 Aac for temperatures up to 45°C. See Figure 1-2 for derating curve.

Figure 1-2. Current Sensing Input Derating Curve (BE1-50/51B-238)

BE1-50/51B-237 Burden

Figure 1-3

At 0.5 Aac .................................. 2.8 Ω

At 5.0 Aac .................................. 0.3 Ω

1-4 BE1-50/51B-237/-238 General Information 9252000899 Rev B

illustrates the current sensing input burden characteristic.

Figure 1-3. Current Sensing Input Burden (BE1-50/51B-237)

BE1-50/51B-238 Burden

BE1-50/51B-234 CT Burden

0

20

40

60

80

100

120

140

0 2 4 6 8 10

Input Current (Amps)

Burden in VA (rms)

BE1-50/51B-238 CT Burden

Figure 1-4

At 0.1 Aac .................................. 57.0 Ω

At 1.0 Aac .................................. 6.9 Ω

illustrates the current sensing input burden characteristic.

Figure 1-4. Current Sensing Input Burden (BE1-50/51B-238)

Frequency Response

A change of ±5 Hz from the nominal 50/60 Hz current causes <0.5% change in the current required for
pickup.

Transient Response

<10% overreach with system time constants up to 40 ms.

Harmonic Rejection

Rejection of odd and even harmonics is illustrated in Figure 1-5.

9252000899 Rev B BE1-50/51B-237/-238 General Information 1-5

Figure 1-5. Harmonic Rejection

Target Indicators

A gravity-latched, manually-reset, current-operated target indicator is provided for the time-overcurrent
(51) trip output and the instantaneous overcurrent A (50-A) trip output. A target indicator is not provided
for the 50-B trip output. The level of trip circuit current required to operate each target is individually
controlled by a circuit board jumper. See Section 2, Controls and Indicators for jumper locations and
function assignments

Minimum Operating Current

Jumper Position—Pins 1 and 2: 0.9 to 2.25 A ∗
Jumper Position—Pins 2 and 3: 80 mA to 200 mA ∗

* Minimum operating current values. See Output Contacts for the maximum acceptable levels of trip
circuit currents.

Output Contacts

Output contacts are surge protected and rated as follows.

Resistive Ratings

120/240 Vac ............................... Make 30 amperes for 0.2 seconds, carry 7 amperes for 2 minutes, 3

amperes continuously, and break 5 amperes.

125/250 Vdc ............................... Make 30 amperes for 0.2 seconds, carry 7 amperes for 2 minutes, 3

amperes continuously, and break 0.3 ampere.

Inductive Ratings

120/240 Vac, 125/250 Vdc ........ Make and carry 30 amperes for 0.2 seconds, carry 7 amperes for 2

minutes, 3 amperes continuously, and break 0.3 ampere. (L/R = 0.04).

Terminal Assignments

51 Element ................................. 1, 2

50-A Element ............................. 1, 2

50-B Element ............................. 1, 3

1-6 BE1-50/51B-237/-238 General Information 9252000899 Rev B

Type Tests

Isolation ..................................... IEEE C37.90-2005

Transient Surge ......................... IEEE C37.90.1-2004

Radiated Interference ................ IEEE C37.90.2-2004

Electrostatic Discharge .............. IEEE C37.90.3-2006

Vibration ..................................... IEC 255-21-1

Shock and Bump ....................... IEC 255-21-2

Environment

Operating Temperature ............. –40 to 70°C (–40 to 158°F)

Storage Temperature ................ –50 to 70°C (–58 to 158°F)

GOST-R Certification

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

Physical

Weight ........................................ 6.1 lb (2.77 kg)

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1-8 BE1-50/51B-237/-238 General Information 9252000899 Rev B

SECTION 2 • CONTROLS AND INDICATORS

TABLE OF CONTENTS

SECTION 2 • CONTROLS AND INDICATORS ........................................................................................ 2-1

Introduction ............................................................................................................................................ 2-1

Front Panel Controls and Indicators ...................................................................................................... 2-1

Circuit Board Controls ............................................................................................................................ 2-3

Figures

Figure 2-1. Front Panel Controls and Indicators ....................................................................................... 2-1

Figure 2-2. Circuit Board Controls
Figure 2-3. View of 50-B Pickup Selector Switches (BE1-50/51B-237)
Figure 2-4. View of 50-B Pickup Selector Switches (BE1-50/51B-238)

Tables

Table 3-1. Front Panel Controls and Indicators ......................................................................................... 2-2

Table 3-2. Circuit Board Controls

............................................................................................................. 2-3

.................................................... 2-5

.................................................... 2-5

.............................................................................................................. 2-4

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ii BE1-50/51B-237/-238 Controls and Indicators 9252000899 Rev B

SECTION 2 • CONTROLS AND INDICATORS

Introduction

BE1-50/51B-237 and BE1-50/51B-238 relay controls and indicators are located on the front panel and
circuit board.

Front Panel Controls and Indicators

Front panel controls and indicators are illustrated in Figure 2-1 and described in Table 2-1. The locators
and descriptions of Table 2-1 correspond to the locators shown in Figure 2-1.

Figure 2-1. Front Panel Controls and Indicators

9252000899 Rev B BE1-50/51B-237/-238 Controls and Indicators 2-1

Table 2-1. Front Panel Controls and Indicators

Locator

Description

A

Time Overcurrent Manual Trip Jacks. These jacks are used to manually trip a breaker

terminated with two standard 0.08 inch diameter phone-tip plugs, into the two jacks.

B

Active/Pickup Indicator. This bicolor LED indicates the level of current sensed by the relay.

on 5A units or 0.1 A pickup setting on 1A units.

C

Target Reset Button. This button is pressed to reset the two, gravity-latched target
indicators (locator F).

E

Instantaneous Overcurrent A Pickup Selector Switches. These two rotary switches select

F

Target Indicators. Red target indicators latch when the corresponding set of trip contacts

indicators are reset by pressing the target reset button (locator C).

G

Time Overcurrent Pickup Selector Switches. These two rotary switches select the time

the relay is in service may cause the relay to trip.

H

Curve Selector Switch. This ten position rotary switch selects one of nine inverse timing

I

Time Overcurrent Time Dial Selector Switches. These two rotary switches select the

these switches corresponds to a time delay of 0.0 to 9.9 seconds.

controlled by the 51 trip output contacts. This is achieved by plugging a jumper wire,

A green LED indicates that the relay is active but not picked up. The LED changes to red
when the sensed current exceeds the time overcurrent pickup setting. The LED changes
from red to green when the sensed current decreases below 95% of the time overcurrent
pickup setting.
Note: A minimum of 0.5 A (5A units) or 0.1 A (1A units) is required to light the LED. The
LED may not turn green (active) before turning red (picked up) at the 0.5 A pickup setting

D Instantaneous Overcurrent Manual Trip Jacks. These jacks are used to manually trip a

breaker controlled by the 50-A trip output contacts. This is achieved by plugging a jumper
wire, terminated with two standard 0.08 inch diameter phone-tip plugs, into the two jacks.
These jacks do not activate the 50-B trip output contacts.

the instantaneous overcurrent A (50-A) pickup current setting in amperes (UNITS and
TENTHS on the BE1-50/51B-237, COARSE and FINE on the BE1-50/51B-238). Adjusting
these selector switches while the relay is in service may cause the relay to trip.

NOTE

When testing time overcurrent functions, instantaneous pickup settings of 00
will affect the calibration of the time functions. Time pickup settings of 00 also
affect instantaneous functions.

closes and sufficient trip circuit current is detected. (The level of current that will trip each
target indicator is jumper-selectable. See Circuit Board Controls for more information.) The
Time target indicates the flow of current in the time overcurrent (51) trip circuit. The Inst
target indicates the flow of current in the instantaneous overcurrent A (50-A) trip circuit. No
target is provided for the instantaneous overcurrent B (50-B) trip circuit. Both target

overcurrent pickup current setting in amperes (UNITS and TENTHS on the BE1-50/51B­237, COARSE and FINE on the BE1-50/51B-238). Adjusting these selector switches while

characteristics or one fixed time function. Refer to Appendix A, Characteristic Curves for
details about the timing characteristics of the BE1-50/51B-237 and BE1-50/51B-238.

desired curve of the timing characteristic selected by the Curve Selector Switch (locator H).
When a fixed time characteristic is used (Curve Selector Switch setting of F), the setting of

2-2 BE1-50/51B-237/-238 Controls and Indicators 9252000899 Rev B

Circuit Board Controls

Circuit board controls consist of two rotary selector switches, a four-position slide switch, and two
jumpers. Circuit board controls are illustrated in Figure 2-2 and described in Table 2-2. The locators and
descriptions of Table 2-2 correspond to the locators shown in Figure 2-2.

Figure 2-2. Circuit Board Controls

9252000899 Rev B BE1-50/51B-237/-238 Controls and Indicators 2-3

Table 2-2. Circuit Board Controls

Locator

Description

A

Target Operating Current Jumpers. Two user-adjustable jumpers control the range of trip

across pins 2 and 3 gives a minimum operating current of 80 to 200 mA.

B

Four Position Slide Switch. This switch assembly, designated SW3, has four independent

instantaneous reset characteristic.

C

Instantaneous Overcurrent B Pickup Selector Switches. These two screwdriver-adjusted,

circuit current required to operate the time overcurrent (51) and instantaneous overcurrent
A (50-A) target indicators. Jumper J1 sets the minimum current range for the 50-A target
indicator and J2 sets the minimum current range for the 51 target indicator. Two jumper
positions are possible: across pins 1 and 2 or across pins 2 and 3. Installing a jumper
across pins 1 and 2 gives a minimum operating current of 0.9 to 2.25 A. Installing a jumper

slide switches designated SW3-1, SW3-2, SW3-3, and SW3-4. Each switch functions as
follows:

SW3-1 selects the nominal system frequency. The OFF position selects 60 Hz operation
and the ON position selects 50 Hz operation.

SW3-2 provides an additional time delay for the instantaneous overcurrent A (50-A)
element. The ON position provides an additional delay of 100 milliseconds.

SW3-3 selects either GE IAC or ABB type characteristic curves. The ON position selects
the GE IAC type curves (listed in Table A-1) and the OFF position selects the ABB type
curves (listed in Table A-2).

SW3-4 selects either an instantaneous or integrating time reset characteristic. The ON
position selects an integrating reset characteristic and the OFF position selects an

rotary switches select the instantaneous overcurrent B (50-B) pickup current setting in
amperes.

The 50-B pickup switches are accessed on the top side of the draw-out assembly by
removing the draw-out assembly from the case. Figure 2-3 shows the 50-B pickup switches
as viewed at the right side of the draw-out assembly of the BE1-50/51B-237. The BE1­50/51B-238 is shown in Figure 2-4.

BE1-50/51B-237

The left-hand switch (SW9) is a 16-position switch that sets the units portion (#.#) of the 50­B pickup setting in amperes. SW9 setting positions consist of 0 through 9 which correspond
to values of 0 to 9 amperes and A through F which correspond to values of 10 to 15
amperes. The right-hand switch (SW10) is a 10-position switch that sets the tenths portion

) of the 50-B pickup setting in amperes. SW10 setting positions consist of 0 through 9

(#.#
which correspond to values of 0.0 to 0.9 amperes.

The minimum allowable 50-B pickup setting is 1.0 Aac and the maximum allowable 50-B
pickup setting is 15.9 Aac. Adjusting the 50-B pickup selector switches while the relay is in
service may cause the relay to trip.

Example: SW9 position 2 and SW10 position 5 is a setting of 2.5 Aac.

BE1-50/51B-238

The total pickup setting is the sum of two settings. The first setting, SW9 has a range of 0.2
to 3.0 corresponding to switch position 1 through F. The second setting, SW10 has a range
of 0.02 to 0.18 corresponding to switch position 1 through 9.

The minimum allowable 50-B pickup setting is 0.2 Aac and the maximum allowable 50-B
pickup setting is 3.18 Aac. Adjusting the 50-B pickup selector switches while the relay is in
service may cause the relay to trip.

Example: SW9 position 2 and SW10 position 5 is a setting of 0.5 Aac.

2-4 BE1-50/51B-237/-238 Controls and Indicators 9252000899 Rev B

Figure 2-3. View of 50-B Pickup Selector Switches (BE1-50/51B-237)

Figure 2-4. View of 50-B Pickup Selector Switches (BE1-50/51B-238)

9252000899 Rev B BE1-50/51B-237/-238 Controls and Indicators 2-5

2-6 BE1-50/51B-237/-238 Controls and Indicators 9252000899 Rev B

SECTION 3 • FUNCTIONAL DESCRIPTION

TABLE OF CONTENTS

SECTION 3 • FUNCTIONAL DESCRIPTION ........................................................................................... 3-1

Introduction ............................................................................................................................................ 3-1

Function Block Descriptions ................................................................................................................... 3-1

Current Sensing Input ........................................................................................................................ 3-1

Power CT and Power Supply ............................................................................................................. 3-1

Signal Conditioning ............................................................................................................................ 3-1

Microprocessor ................................................................................................................................... 3-1

Outputs ............................................................................................................................................... 3-2

Target Indicators ................................................................................................................................ 3-2

Figures

Figure 3-1. Function Block Diagram .......................................................................................................... 3-1

9252000899 Rev B BE1-50/51B-237/-238 Functional Description i

ii BE1-50/51B-237/-238 Functional Description 9252000899 Rev B

SECTION 3 • FUNCTIONAL DESCRIPTION

Introduction

This section illustrates and describes the functional capabilities of the BE1-50/51B-237 and BE1-50/51B­238 relays.

Function Block Descriptions

The function blocks of the BE1-50/51B-237 and BE1-50/51B-238 relays are illustrated in Figure 3-1 and
described in the following paragraphs.

Figure 3-1. Function Block Diagram

Current Sensing Input

Single-phase ac current supplied by a system current transformer (CT) is applied to the BE1-50/51B-237
and BE1-50/51B-238 through terminals 5 and 6. Sensing current is applied to internal power and signal
CTs.

Power CT and Power Supply

The output of the power CT is supplied to the power supply which provides rectified and filtered operating
power for all relay circuitry. A precision 5 Vdc output of the power supply serves as a reference for
automatic calibration.

Signal Conditioning

Current from the signal CT is rectified and applied to three independent sets of scaling resistors controlled
by the Time Overcurrent (51), Instantaneous Overcurrent A (50-A), and Instantaneous Overcurrent B (50­B) pickup switches. The analog-to-digital converter receives the analog voltage developed across the
scaling resistors and converts it into a digital signal that is supplied to the microprocessor.

Microprocessor

The microprocessor performs program operations based on the sensed current, switch settings, and the
internal software program.

When sufficient current is sensed by the relay, the microprocessor is active and executing code, and the
Active/Pickup LED is green. When the sensed current decreases below the operating threshold,
microprocessor operation is interrupted and the Active/Pickup LED turns off. A watchdog circuit resets the
microprocessor program when code execution is interrupted.

9252000899 Rev B BE1-50/51B-237/-238 Functional Description 3-1

Power-off sensing circuits measure the voltage across a capacitor at power-down and power-up. These
circuits determine how long power has been removed based on the difference voltage and the circuit’s
RC time constant. This provides information from the integrating reset function even when power has
been entirely removed.

The microprocessor performs the program operations based on the inputs and the internal software
program. When the sensed current exceeds the TIME PICKUP setting, the ACTIVE/PICKUP LED turns
from green to red. The 50-A/51 contact is closed in accordance with the TIME characteristic equation or if
the sensed current exceeds the INST PICKUP setting. Likewise, sensed current exceeding the
Instantaneous Overcurrent B Pickup selector switch setting causes the 50-B Trip output contacts to close.

Outputs

Each protective element (time overcurrent (51), instantaneous overcurrent A (50-A), and instantaneous
overcurrent B (50-B)) is equipped with a set of normally-open contacts rated for tripping duty. A system
circuit breaker controlled by the 51 or 50-A output contacts can be manually tripped by connecting a
jumper across the Time Overcurrent Manual Trip jacks or the Instantaneous Overcurrent Manual Trip
jacks. (Manual trip jacks are not provided for the system circuit breaker controlled by the 50-B output
contacts.) Current flow in a trip circuit is indicated by operation of the corresponding target. The targets
will not operate without adequate relay operating power.

WARNING!

Trip circuit voltage is present at the front panel trip jacks. When shorting the
trip jacks, use insulated jumpers to avoid contact with these voltages.

Target Indicators

Gravity-latched, manually-reset, current-operated target indicators are provided for the time overcurrent
(51) trip output and the instantaneous overcurrent A (50-A) trip output. A target indicator is not provided
for the 50-B trip output. The level of trip circuit current required to operate each target is individually
controlled by a circuit board jumper. The minimum operating current range can be set for 80 to 200
milliamperes or 0.9 to 2.25 amperes. See Section 2, Controls and Indicators for jumper locations and
function assignments.

3-2 BE1-50/51B-237/-238 Functional Description 9252000899 Rev B

SECTION 4 • INSTALLATION

TABLE OF CONTENTS

SECTION 4 • INSTALLATION .................................................................................................................. 4-1

General .................................................................................................................................................. 4-1

Factory Settings ..................................................................................................................................... 4-1

Installation .............................................................................................................................................. 4-1

Connections ........................................................................................................................................... 4-2

Application Coordination ........................................................................................................................ 4-3

Maintenance........................................................................................................................................... 4-4

Storage ................................................................................................................................................... 4-4

Figures

Figure 4-1. Typical AC Connections .......................................................................................................... 4-2

Figure 4-2. Typical DC Connections
Figure 4-3. Coordination Timing Diagram

.......................................................................................................... 4-3

................................................................................................. 4-4

9252000899 Rev B BE1-50/51B-237/-238 Installation i

ii BE1-50/51B-237/-238 Installation 9252000899 Rev B

SECTION 4 • INSTALLATION

General

When not shipped as part of a control or switchgear panel, the relays are shipped in sturdy cartons to
prevent damage during transit. Immediately upon receipt of a relay, check the model and part number
against the requisition and packing list to see that they agree. Visually inspect the relay for damage that
may have occurred during shipment. If there is evidence of damage, immediately file a claim with the
carrier and notify the Regional Sales Office, or contact the Sales Representative at Basler Electric,
Highland, Illinois.

Proper operation of the relay may be confirmed by performing the operational test procedure of Section 5.
If the relay will not be installed immediately, store the relay in its original shipping carton in a moisture and
dust-free environment.

Factory Settings

Factory settings for the internal switches of SW3 and jumper settings are as follows:

• SW3-1 — OFF (60 hertz operation).

• SW3-2 — OFF (0.0 additional fixed delay for the instantaneous element).

• SW3-3 — ON (GE IAC type characteristic curves).

• SW3-4 — ON (Integrating reset characteristics).

• J1 pins 2-3 — 50-A minimum target operating current of 80 to 200 mA

• J2 pins 2-3 — 51 minimum target operating current of 80 to 200 mA

Installation

Select the desired relay settings before putting the relay into service. Changing pickup current settings
while the relay is in service may cause tripping. Perform the following procedures to install the BE1­50/51B-237 or BE1-50/51B-238 relay.

• Select the desired relay settings on your new BE1-50/51B-237 or BE1-50/51B-238 relay.

• Remove the existing IAC relay.

• Use the four screws provided and attach the cover adapter to the existing case.

• Insert the new relay and close the cradle latches locking the relay into the case.

• Install the new Basler Electric connection plug.

• To install the cover, position the interlocking bracket at the top of the new Basler Electric cover into

the mating receptacle at the top of the cover adapter plate. Secure the captive fastener at the bottom
of the cover.

9252000899 Rev B BE1-50/51B-237/-238 Installation 4-1

Connections

Typical ac and dc connections are shown in Figures 4-1 and 4-2.

Figure 4-1. Typical AC Connections

4-2 BE1-50/51B-237/-238 Installation 9252000899 Rev B

Figure 4-2. Typical DC Connections

CM

110

Application Coordination

In a typical application coordination scheme, a BE1-50/51B-237 or BE1-50/51B-238 is used to provide
primary protection for a radial distribution feeder. An electromechanical overcurrent relay with extremely
inverse timing provides protection for the transformer and bus. To improve coordination with the
electromechanical relay, the BE1-50/51B-237 or BE1-50/51B-238 is configured with the following settings:

• Integrating reset enabled (SW3-4 ON)

• GE IAC type curves selected (SW3-3 ON)

The feeder reclosing relay is set for two reclose attempts at 3 and 15 seconds after the initial trip. If a
permanent fault occurs (magnitude 10 times pickup), calculate the feeder breaker trip time for each of the
three operations. Refer to Appendix A for the characteristic curve constants and definition of the terms
used in the following time characteristic curve equations.

From the time characteristic curve equation:

T

=

0938.2

AD

=

T

N

−

27624.7

×

−

KBD

++

028.0)202758.0(

+×+

= 0.209 seconds

9252000899 Rev B BE1-50/51B-237/-238 Installation 4-3

From the reset characteristic curve equation:

12−

=

M

RD

T

R

seconds 15.5

10

27.75

2

−=

−

×

=

M equals 0 if current goes to zero. A negative result indicates reset time.

Result: Full trip = 0.209 seconds and full reset = 15.5 seconds if current goes to zero.

In Figure 4-3:

= 0.209 seconds (relay was at reset)

T

A

= value<TA because rewind has not gone to zero

T

B

= value<TA because rewind has not gone to zero

T

C

Figure 4-3. Coordination Timing Diagram

Maintenance

BE1-50/51B-237 and BE1-50/51B-238 relays require no preventative maintenance other than periodic
checking of relay connections to make sure that they are clean and tight. If the relay fails to function
properly, contact the Technical Sales Support department of Basler Electric.

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.

4-4 BE1-50/51B-237/-238 Installation 9252000899 Rev B

SECTION 5 • TESTING

TABLE OF CONTENTS

SECTION 5 • TESTING ............................................................................................................................ 5-1

Introduction ............................................................................................................................................ 5-1

Dielectric Test ........................................................................................................................................ 5-1

Test Procedures ..................................................................................................................................... 5-1

Model BE1-50/51B-237 (Five Ampere Sensing Input) ....................................................................... 5-1

Time Overcurrent (51) Pickup ........................................................................................................ 5-1

Time Dial ......................................................................................................................................... 5-2

Integrating Reset ............................................................................................................................ 5-2

Instantaneous Overcurrent A (50-A) Pickup ................................................................................... 5-2

Instantaneous Overcurrent B (50-B) Pickup ................................................................................... 5-3

Target Indicators ............................................................................................................................. 5-4

Manual Trip ..................................................................................................................................... 5-5

Model BE1-50/51B-238 (One Ampere Sensing Input) ....................................................................... 5-5

Time Overcurrent (51) Pickup ........................................................................................................ 5-5

Time Dial ......................................................................................................................................... 5-6

Integrating Reset ............................................................................................................................ 5-6

Instantaneous Overcurrent A (50-A) Pickup ................................................................................... 5-7

Instantaneous Overcurrent B (50-B) Pickup ................................................................................... 5-7

Target Indicators ............................................................................................................................. 5-8

Manual Trip ..................................................................................................................................... 5-9

Figures

Figure 5-1. 51 Pickup, Time Dial, Integrating Reset, and 50-A Pickup Test Setup .................................. 5-3

Figure 5-3. 50-B Pickup Test Setup
Figure 5-4. Target Indicator Test Setup

Figure 5-1. 51 Pickup, Time Dial, Integrating Reset, and 50-A Pickup Test Setup .................................. 5-7

Figure 5-3. 50-B Pickup Test Setup
Figure 5-4. Target Indicator Test Setup

.......................................................................................................... 5-4

.................................................................................................... 5-5

.......................................................................................................... 5-8

.................................................................................................... 5-9

9252000899 Rev B BE1-50/51B-237/-238 Testing i

ii BE1-50/51B-237/-238 Testing 9252000899 Rev B

SECTION 5 • TESTING

Observe all applicable electrostatic discharge (ESD) precautions when

Introduction

Proper relay operation may be confirmed by performing the test procedures in this section.

Dielectric Test

In accordance with IEC 255-5 and IEEE C37.90-2005, one-minute dielectric (high potential) tests may be
performed as follows:

All circuits to ground: 2,828 Vdc or 2,000 Vac
Input to output circuits: 2,828 Vdc or 2,000 Vac

Output contacts are surge protected.

Test Procedures

The following test procedures verify operation of the BE1-50/51B-237 and BE1-50/51B-238 relays. The
test setups illustrated in Figures 5-1 through 5-6 are intended primarily as an illustration of the principles
involved. Other test equipment known to be capable of testing with the stated and implied tolerances
(including equipment designed specifically for testing protective relays) may be used.

The minimum test equipment requirements are:

• Current source with a range of 0 to 20 Aac (sensing input current)

• AC or DC voltage source (target operation)

• Timer or counter

NOTES

To ensure proper timing during testing, remove the current from the relay for R
times D seconds. (Refer to Appendix A, Characteristic Curves for definitions of
R and D.

When testing TIME overcurrent functions, INST PICKUP settings of 00 will
affect the calibration of the TIME functions. TIME PICKUP settings of 00 also
affect INST functions.

handling the relay assembly.

Model BE1-50/51B-237 (Five Ampere Sensing Input)

Time Overcurrent (51) Pickup

1. Connect and configure the relay for 51 pickup testing:

a. Connect the test setup shown in Figure 5-1.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (GE IAC type characteristic curves)
SW3-4 = ON (integrating reset characteristic)

c. Set the TIME DIAL to 0.0.

d. Set CURVE to S.

e. Set TIME PICKUP to 0.5.

f. Set INST PICKUP (50-A) to 90.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (15.0 Aac).

9252000899 Rev B BE1-50/51B-237/-238 Testing 5-1

2. Apply and increase current to terminals 5 and 6 until the Active/Pickup LED turns red. The applied

current should be no greater than 0.55 Aac.

3. Decrease the applied current until the Active/Pickup LED changes from red to green and then off.

4. Set TIME PICKUP to 2.2.

5. Slowly increase current to terminals 5 and 6 until the Active/Pickup LED turns red. The applied

current should be between 2.131 and 2.269 Aac.

6. Reduce the applied current to zero.

Time Dial

1. Connect and configure the relay for time dial testing:

a. Connect the test setup shown in Figure 5-1.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (GE IAC type characteristic curves)
SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 4.5.

d. Set CURVE to S.

e. Set TIME PICKUP to 1.0.

f. Set INST PICKUP (50-A) to 90.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (15.0 Aac).

2. Prepare to apply 1.5 Aac to terminals 5 and 6 and record the elapsed time from when current is

applied until the 51 output contacts close.

3. Apply the current (step from 0 to 1.5 Aac) and record the elapsed time. The elapsed time should be

between 0.345 and 0.424 seconds. (This tolerance is greater than ±2% because it is the
accumulation of both pickup and timing tolerances.)

4. Remove the input current.

Integrating Reset

1. Connect and configure the relay for integrating reset testing.

a. Connect the test setup shown in Figure 5-1.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (GE IAC type characteristic curves)
SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 9.9

d. Set CURVE to V.

e. Set TIME PICKUP to 1.0.

f. Set INST PICKUP (50-A) to 90.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (15.0 Aac).

2. Apply 4.0 Aac to terminals 5 and 6. After the unit trips, remove the applied current for 29 ±0.25

seconds, then reapply the current (4.0 Aac). Note the elapsed time from the reapplication of current to
the second trip. The elapsed time should be 2.08 ±0.4 seconds.

Instantaneous Overcurrent A (50-A) Pickup

1. Connect and configure the relay for 50-A pickup testing:

a. Connect the test setup shown in Figure 5-1.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (GE IAC type characteristic curves)

5-2 BE1-50/51B-237/-238 Testing 9252000899 Rev B

SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 0.0.

d. Set CURVE to S.

e. Set TIME PICKUP to 15.0.

f. Set INST PICKUP (50-A) to 02.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (15.0 Aac).

2. Apply and slowly increase current to terminals 5 and 6 until the 50-A output contacts close. The
applied current should be between 1.935 and 2.065 Aac.

3. Decrease the applied current until the 50-A output contacts open.

4. Set INST PICKUP (50-A) to 08.

5. Slowly increase the current applied to terminals 5 and 6 until the 50-A output contacts close. The
applied current should be between 7.815 and 8.185 Aac.

6. Reduce the applied current to zero.

Figure 5-1. 51 Pickup, Time Dial, Integrating Reset, and 50-A Pickup Test Setup

Instantaneous Overcurrent B (50-B) Pickup

1. Connect and configure the relay for 50-B pickup testing:

a. Connect the test setup shown in Figure 5-2.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (GE IAC type characteristic curves)
SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 0.0.

d. Set CURVE to S.

e. Set TIME PICKUP to 15.0.

f. Set INST PICKUP (50-A) to 90.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to 20 (2.0 Aac).

2. Apply and slowly increase current to terminals 5 and 6 until the 50-B output contacts close. The
applied current should be between 1.935 and 2.065 Aac.

3. Decrease the applied current until the 50-B output contacts open.

9252000899 Rev B BE1-50/51B-237/-238 Testing 5-3

4. Set INST PICKUP (50-B) to 80 (8.0 Aac).

5. Slowly increase the current applied to terminals 5 and 6 until the 50-B output contacts close. The
applied current should be between 7.815 and 8.185 Aac.

6. Reduce the applied current to zero.

Figure 5-2. 50-B Pickup Test Setup

Target Indicators

1. Connect and configure the relay for target indicator testing:

a. Connect the test setup shown in Figure 5-3.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (GE IAC type characteristic curves)
SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 0.0.

d. Set CURVE to S.

e. Set TIME PICKUP to 1.0.

f. Set INST PICKUP (50-A) to 90.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (15.0 Aac).

2. Apply 2 Aac to terminals 5 and 6 to trip the 51 relay output.

3. Slowly increase the voltage source to provide target current and verify that the Time target operates
at the level of current determined by the Target Operating Current Jumpers.

The Target Operating Current Jumpers are located on the circuit board and identified as J1 and J2.
J1 sets the minimum current range for the 50-A target and J2 sets the minimum current range for the
51 target. A jumper installed across pins 1 and 2 gives a minimum operating current of 0.9 to 2.25 A.
A jumper installed across pins 2 and 3 gives a minimum operating current of 80 to 200 mA.

4. Remove the target and sensing current and reset the target.

5. Set TIME PICKUP to 9.0.

6. Set INST PICKUP (50-A) to 01.

7. Apply 2 Aac to terminals 5 and 6 to trip the 50-A relay output.

8. Slowly increase the voltage source to provide target current and verify that the Instantaneous target
operates at the level of current determined by the Target Operating Current Jumpers.

9. Remove the target and sensing current and reset the target.

5-4 BE1-50/51B-237/-238 Testing 9252000899 Rev B

Figure 5-3. Target Indicator Test Setup

Manual Trip

1. Configure the relay for manual trip testing:

a. Connect the test setup as shown in Figure 5-1.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (GE IAC type characteristic curves)
SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 0.0

d. Set CURVE to S.

e. Set TIME PICKUP to 1.0.

f. Set INST PICKUP (50-A) to 90.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to 20 (2.0 Aac).

2. Apply 0.9 Aac to terminals 5 and 6 (0.9 Aac provides relay operating power but is below the pickup
threshold.)

3. Connect a jumper to the Time Overcurrent Manual Trip jacks. Verify that the stop input of the test set
timer recognizes a 51 contact closure.

4. Remove the jumper and the current applied at relay terminals 5 and 6.

5. Apply 0.9 Aac to terminals 5 and 6.

6. Connect a jumper to the Instantaneous Overcurrent Manual Trip jacks. Verify that the stop input of
the test set timer recognizes a 50-A contact closure

7. Remove the jumper and the current applied to relay terminals 5 and 6.

8. Reset targets.

Model BE1-50/51B-238 (One Ampere Sensing Input)

Time Overcurrent (51) Pickup

1. Connect and configure the relay for 51 pickup testing:

a. Connect the test setup shown in Figure 5-4.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)

9252000899 Rev B BE1-50/51B-237/-238 Testing 5-5

SW3-3 = ON (GE IAC type characteristic curves)
SW3-4 = ON (integrating reset characteristic)

c. Set the TIME DIAL to 0.0.

d. Set CURVE to S.

e. Set TIME PICKUP to 0.1.

f. Set INST PICKUP (50-A) to 18.0.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (3.0 Aac).

2. Apply and increase current to terminals 5 and 6 until the Active/Pickup LED turns red. The applied
current should be no greater than 0.11 Aac.

3. Decrease the applied current until the Active/Pickup LED changes from red to green and then off.

4. Set TIME PICKUP to 0.44.

5. Slowly increase current to terminals 5 and 6 until the Active/Pickup LED turns red. The applied
current should be between 0.426 and 0.454 Aac.

6. Reduce the applied current to zero.

Time Dial

1. Connect and configure the relay for time dial testing:

a. Connect the test setup shown in Figure 5-4.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (GE IAC type characteristic curves)
SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 4.5.

d. Set CURVE to S.

e. Set TIME PICKUP to 0.2.

f. Set INST PICKUP (50-A) to 18.0.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (3.0 Aac).

2. Prepare to apply 0.3 Aac to terminals 5 and 6 and record the elapsed time from when current is
applied until the 51 output contacts close.

3. Apply the current (step from 0 to 0.3 Aac) and record the elapsed time. The elapsed time should be
between 0.345 and 0.424 seconds. (This tolerance is greater than ±2% because it is the
accumulation of both pickup and timing tolerances.)

4. Remove the input current.

Integrating Reset

1. Connect and configure the relay for integrating reset testing.

a. Connect the test setup shown in Figure 5-4.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (GE IAC type characteristic curves)
SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 9.9

d. Set CURVE to V.

e. Set TIME PICKUP to 0.2.

f. Set INST PICKUP (50-A) to 18.0.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (3.0 Aac).

5-6 BE1-50/51B-237/-238 Testing 9252000899 Rev B

2. Apply 0.8 Aac to terminals 5 and 6. After the unit trips, remove the applied current for 29 ±0.25
seconds, then reapply the current (0.8 Aac). Note the elapsed time from the reapplication of current to
the second trip. The elapsed time should be 2.08 ±0.4 seconds.

Instantaneous Overcurrent A (50-A) Pickup

1. Connect and configure the relay for 50-A pickup testing:

a. Connect the test setup shown in Figure 5-4.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (GE IAC type characteristic curves)
SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 0.0.

d. Set CURVE to S.

e. Set TIME PICKUP to 3.18.

f. Set INST PICKUP (50-A) to 0.4.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (3.0 Aac).

2. Apply and slowly increase current to terminals 5 and 6 until the 50-A output contacts close. The
applied current should be between 0.387 and 0.413 Aac.

3. Decrease the applied current until the 50-A output contacts open.

4. Set INST PICKUP (50-A) to 1.6.

5. Slowly increase the current applied to terminals 5 and 6 until the 50-A output contacts close. The
applied current should be between 1.563 and 1.637 Aac.

6. Reduce the applied current to zero.

Figure 5-4. 51 Pickup, Time Dial, Integrating Reset, and 50-A Pickup Test Setup

Instantaneous Overcurrent B (50-B) Pickup

1. Connect and configure the relay for 50-B pickup testing:

a. Connect the test setup shown in Figure 5-5.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)

9252000899 Rev B BE1-50/51B-237/-238 Testing 5-7

SW3-3 = ON (GE IAC type characteristic curves)
SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 0.0.

d. Set CURVE to S.

e. Set TIME PICKUP to 3.18.

f. Set INST PICKUP (50-A) to 18.0.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to 20 (0.4 Aac).

2. Apply and slowly increase current to terminals 5 and 6 until the 50-B output contacts close. The
applied current should be between 0.387 and 0.413 Aac.

3. Decrease the applied current until the 50-B output contacts open.

4. Set INST PICKUP (50-B) to 80 (1.6 Aac).

5. Slowly increase the current applied to terminals 5 and 6 until the 50-B output contacts close. The
applied current should be between 1.563 and 1.637 Aac.

6. Reduce the applied current to zero.

Figure 5-5. 50-B Pickup Test Setup

Target Indicators

1. Connect and configure the relay for target indicator testing:

a. Connect the test setup shown in Figure 5-6.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (GE IAC type characteristic curves)
SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 0.0.

d. Set CURVE to S.

e. Set TIME PICKUP to 0.2.

f. Set INST PICKUP (50-A) to 18.0.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) at F0 (3.0 Aac).

2. Apply 0.4 Aac to terminals 5 and 6 to trip the 51 relay output.

3. Slowly increase the voltage source to provide target current and verify that the Time target operates
at the level of current determined by the Target Operating Current Jumpers.

5-8 BE1-50/51B-237/-238 Testing 9252000899 Rev B

The Target Operating Current Jumpers are located on the circuit board and identified as J1 and J2.
J1 sets the minimum current range for the 50-A target and J2 sets the minimum current range for the
51 target. A jumper installed across pins 1 and 2 gives a minimum operating current of 0.9 to 2.25 A.
A jumper installed across pins 2 and 3 gives a minimum operating current of 80 to 200 mA.

4. Remove the target and sensing current and reset the target.

5. Set TIME PICKUP to 1.8.

6. Set INST PICKUP (50-A) to 0.2.

7. Apply 0.4 Aac to terminals 5 and 6 to trip the 50-A relay output.

8. Slowly increase the voltage source to provide target current and verify that the Instantaneous target
operates at the level of current determined by the Target Operating Current Jumpers.

9. Remove the target and sensing current and reset the targets.

Figure 5-6. Target Indicator Test Setup

Manual Trip

1. Configure the relay for manual trip testing:

a. Connect the test setup as shown in Figure 5-4.

b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (GE IAC type characteristic curves)
SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 0.0

d. Set CURVE to S.

e. Set TIME PICKUP to 0.2.

f. Set INST PICKUP (50-A) to 18.0.

g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) at 20 (0.4 Aac).

2. Apply 0.18 Aac to terminals 5 and 6 (0.18 Aac provides relay operating power but is below the pickup
threshold.)

3. Connect a jumper to the Time Overcurrent Manual Trip jacks. Verify that the stop input of the test set
timer recognizes a 51 contact closure.

4. Remove the jumper and the current applied at relay terminals 5 and 6.

5. Apply 0.18 Aac to terminals 5 and 6.

9252000899 Rev B BE1-50/51B-237/-238 Testing 5-9

6. Connect a jumper to the Instantaneous Overcurrent Manual Trip jacks. Verify that the stop input of
the test set timer recognizes a 50-A contact closure

7. Remove the jumper and the current applied to relay terminals 5 and 6.

8. Reset targets.

5-10 BE1-50/51B-237/-238 Testing 9252000899 Rev B

APPENDIX A • CHARACTERISTIC CURVES

TABLE OF CONTENTS

APPENDIX A • CHARACTERISTIC CURVES .......................................................................................... A-1

Introduction ............................................................................................................................................ A-1

Instantaneous Overcurrent Characteristics ........................................................................................... A-1

Timing ................................................................................................................................................. A-1

Pickup ................................................................................................................................................. A-1

Time Overcurrent Characteristics .......................................................................................................... A-1

Inverse Time Functions ...................................................................................................................... A-2

Characteristic Curve Groups .............................................................................................................. A-2

Timing Accuracy ............................................................................................................................... A-17

Fixed Time Characteristic................................................................................................................. A-17

Integrating Time Reset Characteristic ................................................................................................. A-17

Figures

Figure A-1. Instantaneous Characteristic Curves ...................................................................................... A-1

Figure A-2. Short Inverse (S) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-2) .................. A-3

Figure A-3. Long Inverse (L) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-5) ................... A-4

Figure A-4. Definite Time (D) Time Characteristic Curve (Similar to ABB CO-6) ..................................... A-5

Figure A-5. Moderately Inverse (M) Time Characteristic Curve (Similar to ABB CO-7) ........................... A-6

Figure A-6. Inverse (I) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-8) ............................. A-7

Figure A-7. Very Inverse (V) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-9) .................... A-8

Figure A-8. Extremely Inverse (E) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-11) ......... A-9

Figure A-9. BS142 Very Inverse (BS142-B) Time Characteristic Curve ................................................. A-10

Figure A-10. BS142 Extremely Inverse (BS142-C) Time Characteristic Curve ...................................... A-11

Figure A-11. Short Inverse (S2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 55) ............ A-12

Figure A-12. Long Inverse (L2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 66) ............. A-13

Figure A-13. Inverse (I2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 51) ....................... A-14

Figure A-14. Very Inverse (V2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 53) ............. A-15

Figure A-15. Extremely Inverse (E2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 77) .... A-16

Figure A-16. Integrating Reset Characteristic Curve ............................................................................... A-17

Tables

Table A-1. Time Characteristic Curve Constants with Switch SW3-3 Open (Off) ..................................... A-2

Table A-2. Time Characteristic Curve Constants with Switch SW3-3 Closed (On)

9252000899 Rev B BE1-50/51B-237/-238 Characteristic Curves i

.................................. A-2

ii BE1-50/51B-237/-238 Characteristic Curves 9252000899 Rev B

APPENDIX A • CHARACTERISTIC CURVES

Introduction

This appendix describes and defines the instantaneous overcurrent, time overcurrent, and integrating
time reset characteristics of the BE1-50/51B-237 and BE1-50/51B-238 relays.

Instantaneous Overcurrent Characteristics

Timing

The instantaneous characteristic curves of the BE1-50/51B-237 and BE1-50/51B-238 relays are similar to
standard electromechanical instantaneous units. However, the time to trip for applications where the initial
sensing current is less than 400 mA may be slightly longer. This may occur on a very lightly loaded circuit
or when the relay is providing ground protection and is connected to measure neutral current. Figure A-1
shows the instantaneous characteristic curves for the maximum time to trip.

Figure A-1. Instantaneous Characteristic Curves

The delay of the Instantaneous A (50-A) element can be set for no intentional delay (switch SW3-2 open)
or a fixed delay of 100 ms (SW3-2 closed). Figure 2-2 illustrates the location of SW3. The time delay of
the 50-B element is not switch-selectable and is fixed at no intentional delay.

Pickup

The instantaneous elements of the BE1-50/51B-237 and BE1-50/51B-238 relays may be set lower than
the instantaneous element in IAC relays and still have the same reach. This is because the BE1-50/51B­237 and BE1-50/51B-238 instantaneous elements effectively eliminate the fault current transient
overreach components. When setting the BE1-50/51B-237 and BE1-50/51B-238 instantaneous elements,
calculate the symmetrical value without any adder for transient overreach.

Time Overcurrent Characteristics

Nine inverse time functions and one fixed (definite) time function can be selected at the front panel. Curve
types are identified by a letter designator. Available curve types are short inverse (S), long inverse (L),
definite time (D), moderately inverse (M), inverse (I), very inverse (V), extremely inverse (E), BS142
inverse, (B), and BS142 extremely inverse (C).

9252000899 Rev B BE1-50/51B-237/-238 Characteristic Curves A-1

Inverse Time Functions

KBD

CM

AD

T

N

T

++

−

=

Curve

Type

BE A B C N K R

S

ABB CO-2

A-2

0.2663

0.03393

1.000

1.2969

0.028

0.500

L

ABB CO-5

A-3

5.6143

2.18592

1.000

1.0000

0.028

15.750

D

ABB CO-6

A-4

0.4794

0.21359

1.000

1.5625

0.028

0.875

M

ABB CO-7

A-5

0.3022

0.12840

1.000

0.5000

0.028

1.750

I

ABB CO-8

A-6

8.9341

0.17966

1.000

2.0938

0.028

9.000

V

ABB CO-9

A-7

5.4678

0.10814

1.000

2.0469

0.028

5.500

E

ABB CO-11

A-8

7.7624

0.02758

1.000

2.0938

0.028

7.750

B

BS142-B∗

A-9

1.4636

0.00000

1.000

1.0469

0.028

3.250

C

BS142-C∗

A-10

8.2506

0.00000

1.000

2.0469

0.028

8.000

F

None†

None

0.0000

1.00000

0.000

0.0000

0.000

1.000

Curve

Type

BE A B C N K R

S

GE IAC 55

A-11

0.0286

0.0208

1.000

0.9844

0.028

0.0940

L

GE IAC 66

A-12

2.3955

0.00002

1.000

0.3125

0.028

7.8001

D

ABB CO-6

A-4

0.4797

0.21359

1.000

1.5625

0.028

0.8750

M

ABB CO-7

A-5

0.3022

0.12840

1.000

0.5000

0.028

1.7500

I

GE IAC 51

A-13

0.2747

0.1042

1.000

0.4375

0.028

0.8868

V

GE IAC 53

A-14

4.4309

0.0991

1.000

1.9531

0.028

5.8231

E

GE IAC 77

A-15

4.9883

0.0129

1.000

2.0469

0.028

4.7742

B

BS142-B∗

A-9

1.4636

0.00000

1.000

1.0469

0.028

3.2500

C

BS142-C∗

A-10

8.2506

0.00000

1.000

2.0469

0.028

8.0000

F

None†

None

0.0000

1.00000

0.000

0.0000

0.000

1.0000

Characteristic curves for the inverse and definite time functions are defined by the following equation:

Where: T

= time to trip in seconds

T

D = time dial setting
M = multiple of pickup setting
A, B, C, N, K = constants for the particular curve

Characteristic Curve Groups

Either GE IAC or ABB characteristic curve groups are selected through switch SW3-3. (Refer to Figure 2­2 for the location of SW3.)

Characteristic Curve Constants

Tables A-1 and A-2 list the time characteristic curve constants used by the relay. Constants have been
selected to conform to the characteristics of electromechanical relays over a range of pickup multiples
from 1.3 to 40. Values of the constants are provided for use in PC relay setting applications. Timing
accuracy is ±1 cycle ±2% of time to trip.

Table A-1. Time Characteristic Curve Constants with Switch SW3-3 Open (Off)

Similar To

Figure

Number

Constants

∗ Curves B and C are defined in British Standard BS142 and IEC 255-4 (International

Electrotechnical Commission).

† Fixed time from 0.1 to 9.9 seconds.

Table A-2. Time Characteristic Curve Constants with Switch SW3-3 Closed (On)

Similar To

Figure

Number

Constants

∗ Curves B and C are defined in British Standard BS142 and IEC 255-4 (International

Electrotechnical Commission).

† Fixed time from 0.1 to 9.9 seconds.

A-2 BE1-50/51B-237/-238 Characteristic Curves 9252000899 Rev B

Characteristic Curves

Figures A-2 through A-15 illustrate the BE1-50/51B-237 and BE1-50/51B-238 time overcurrent
characteristic curves.

Figure A-2. Short Inverse (S) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-2)

9252000899 Rev B BE1-50/51B-237/-238 Characteristic Curves A-3

Figure A-3. Long Inverse (L) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-5)

A-4 BE1-50/51B-237/-238 Characteristic Curves 9252000899 Rev B

Figure A-4. Definite Time (D) Time Characteristic Curve (Similar to ABB CO-6)

9252000899 Rev B BE1-50/51B-237/-238 Characteristic Curves A-5

Figure A-5. Moderately Inverse (M) Time Characteristic Curve (Similar to ABB CO-7)

A-6 BE1-50/51B-237/-238 Characteristic Curves 9252000899 Rev B

Figure A-6. Inverse (I) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-8)

9252000899 Rev B BE1-50/51B-237/-238 Characteristic Curves A-7

Figure A-7. Very Inverse (V) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-9)

A-8 BE1-50/51B-237/-238 Characteristic Curves 9252000899 Rev B

Figure A-8. Extremely Inverse (E) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-11)

9252000899 Rev B BE1-50/51B-237/-238 Characteristic Curves A-9

Figure A-9. BS142 Very Inverse (BS142-B) Time Characteristic Curve

A-10 BE1-50/51B-237/-238 Characteristic Curves 9252000899 Rev B

Figure A-10. BS142 Extremely Inverse (BS142-C) Time Characteristic Curve

9252000899 Rev B BE1-50/51B-237/-238 Characteristic Curves A-11

Figure A-11. Short Inverse (S2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 55)

A-12 BE1-50/51B-237/-238 Characteristic Curves 9252000899 Rev B

Figure A-12. Long Inverse (L2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 66)

9252000899 Rev B BE1-50/51B-237/-238 Characteristic Curves A-13

Figure A-13. Inverse (I2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 51)

A-14 BE1-50/51B-237/-238 Characteristic Curves 9252000899 Rev B

Figure A-14. Very Inverse (V2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 53)

9252000899 Rev B BE1-50/51B-237/-238 Characteristic Curves A-15

Figure A-15. Extremely Inverse (E2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 77)

A-16 BE1-50/51B-237/-238 Characteristic Curves 9252000899 Rev B

Timing Accuracy

1

2

−

=

M

RD

T

R

Trip to TimeKBD

CM

AD

T

N

T

=++

−

=

M

RD

1

Timing accuracy is the sum of ±1 cycle, ±2%. This accuracy applies to the range of 1.3 to 40 times tap
and is for a given measured multiple of tap. Measurement accuracy of the multiple of tap is the sum of
±2%, ±25 mA for the BE1-50/51B-237 and ±2%, ±5 mA for the BE1-50/51B-238.

Fixed Time Characteristic

The fixed time characteristic corresponds to the time dial setting and provides delays of 0.0 to 9.9
seconds. The time setting is constant over a range of pickup multiples from 1.0 to 40. Accuracy is ±1
cycle, ±2% of the time to trip for time dial settings of 0.1 and greater.

Integrating Time Reset Characteristic

The relay can be user-configured for integrating or instantaneous type reset.

Integrating reset simulates the disk reset of electromechanical relays and begins when the current
decreases below 95% of pickup. BE1-50/51B-237 and BE1-50/51B-238 relays provide the integrating
reset function even when input current decreases to zero.

Integrating reset characteristics are defined by the following equation and are illustrated in Figure A-16.
See Table A-1 and A-2 for the equation constants.

Where: T
R = constant for the particular curve
D = time dial setting
M = current in multiples of pickup setting during reset

Time characteristic curve equation:

Where: D = time dial setting
M = multiple of pickup setting

Reset characteristic curve equation:

= time to reset in seconds

R

T

=

R

=

2

−

Reset to Time

Figure A-16. Integrating Reset Characteristic Curve

Instantaneous Reset

Reset occurs within 16 ms of when the current decreases to 95% of the pickup level.

9252000899 Rev B BE1-50/51B-237/-238 Characteristic Curves A-17

A-18 BE1-50/51B-237/-238 Characteristic Curves 9252000899 Rev B

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