How it Works
Basler Electric
Loading...
BE1-51/27R
User Manual
114 pgs5.99 Mb0
Table of contents
Loading...

Basler Electric BE1-51/27R User Manual

INSTRUCTION MANUA L
FOR

BE1-51/27R

Time Overcurrent Relay with Voltage Control
Publication: 9137200999 Revision: F Mar-15
Caution
Note

Preface

This instruction manual provides information about the installation and operatio n of the BE1-51/27R Time Overcurrent Relay with Voltage Control. 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.
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
manual.
The English-language versi on of this manu al ser ves as the only appr ove d manual version.
12570 State Route 143
Highland IL 62249-1074 USA
www.basler.com
info@basler.com
Tel: +1 618.654.2341
Fax: +1 618.654.2351
© 2015 by Basler Electric
All rights reserved
First printing: September 1993
Warning!
READ THIS MANUAL. Read this manual before installing, operating, or maintaining the BE1-51/27R.
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 understanding 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 detai ls and var iatio ns in equi pm ent, 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. Over time, improvements and revisions may be made to this publication. Before performing any of the following procedures, contact Basler Electric for the latest revision of this

Contents

Introduction ................................................................................................................................................. 1
Application ................................................................................................................................................. 1
Backup Protection .................................................................................................................................. 1
Residually Connected ............................................................................................................................ 1
Operating Characteristics at Reduced Voltages .................................................................................... 2
Standard Features ..................................................................................................................................... 4
Time Overcurrent Functions .................................................................................................................. 4
Non-Integrating Timing .......................................................................................................................... 5
Integrating Timing .................................................................................................................................. 5
Built-In Test ............................................................................................................................................ 5
Options ...................................................................................................................................................... 5
Timing .................................................................................................................................................... 5
Sensing Input Type ................................................................................................................................ 5
Sensing Input Range ............................................................................................................................. 5
Power Supply ......................................................................................................................................... 6
Targets ................................................................................................................................................... 6
Outputs .................................................................................................................................................. 6
Instantaneous Outputs ........................................................................................................................... 6
Packaging .............................................................................................................................................. 6
Model and Style Number Description ........................................................................................................ 6
Controls and Indicators .............................................................................................................................. 9
Functional Description ............................................................................................................................. 13
Block Diagram Analysis ........................................................................................................................... 13
Power Supply ....................................................................................................................................... 14
Current Sensing ................................................................................................................................... 14
Tap Select and Tap Cal ....................................................................................................................... 14
Voltage Sensing ................................................................................................................................... 14
Multiplexor ............................................................................................................................................ 14
Analog-To-Digital Converter and Level Detector ................................................................................. 14
Time Trip Comparator and Scaler ....................................................................................................... 14
Voltage Restraint ................................................................................................................................. 15
Microprocessor (Not Shown) ............................................................................................................... 15
Instantaneous Overcurrent (Options 1-1 and 1-2) ............................................................................... 15
Timed and Instantaneous Outputs....................................................................................................... 15
Auxiliary Outputs .................................................................................................................................. 16
Push-to-Energize Pushb utt ons ............................................................................................................ 16
Power Supply Status Output (Option 3-6) ........................................................................................... 16
Target Indicators .................................................................................................................................. 16
Installation ................................................................................................................................................. 17
Relay Operating Guidelines and Precautions ......................................................................................... 17
Mounting .................................................................................................................................................. 17
Connections ............................................................................................................................................. 30
Maintenance ............................................................................................................................................ 40
Storage .................................................................................................................................................... 40
Tests and Adjustments ............................................................................................................................. 41
Required Test Equipment ........................................................................................................................ 41
Operational Test ...................................................................................................................................... 41
Preliminary Instructions ....................................................................................................................... 41
Time Overcurrent Pickup Test ............................................................................................................. 45
Timed Output Test ............................................................................................................................... 47
Instantaneous Overcurrent Pickup Test .............................................................................................. 49
Voltage Restraint Test ......................................................................................................................... 50
Adjustments of Controls for Relay Operation .......................................................................................... 51
TAP and TAP (NEUTRAL) Selector Setting ........................................................................................ 51
Time Overcurrent Curve Selection (Timing Type Z1, Z2, and Z3 Only) .............................................. 52
Time Delay Selection ........................................................................................................................... 53
Neutral Time Delay Selection .............................................................................................................. 53
INST 1 Control Setting ......................................................................................................................... 54
INST 2 Control Setting ......................................................................................................................... 55
Setting the Relay ..................................................................................................................................... 55
General ................................................................................................................................................ 55
Relay Setting Concepts ....................................................................................................................... 55
Setting Example ................................................................................................................................... 57
Coordination with Feeder 51 Relay for Fault 1 .................................................................................... 58
Checking Coordination with Relay 67 for Fault 2 ................................................................................ 59
Checking Coordination with Relay 67 for Fault 3 ................................................................................ 60
Neutral Element Backup Settings ........................................................................................................ 61
Specifications ............................................................................................................................................ 63
Operational Specifications ....................................................................................................................... 63
Time Overcurrent Pickup Selection Range ......................................................................................... 63
Time Overcurrent Pickup Accuracy ..................................................................................................... 63
Time Overcurrent Dropout Rati o .......................................................................................................... 63
Instantaneous Overcurrent Pickup Range ........................................................................................... 63
Instantaneous Overcur rent Meas ur ing Ac c urac y ................................................................................ 63
Instantaneous Overcurrent Dropout Ratio ........................................................................................... 63
Instantaneous Response ..................................................................................................................... 63
Time Delay Accuracy ........................................................................................................................... 64
General Specifications............................................................................................................................. 64
Voltage Sensing Inputs ........................................................................................................................ 64
Sensing Input Burden .......................................................................................................................... 64
Sensing Input Rating ........................................................................................................................... 64
Output Circuits ..................................................................................................................................... 64
Target Indicators .................................................................................................................................. 65
Power Supply ....................................................................................................................................... 65
Radio Frequency Interference (RFI) .................................................................................................... 65
Isolation ................................................................................................................................................ 65
Surge Withstand Capability ................................................................................................................. 65
UL Recognized .................................................................................................................................... 65
GOST-R ............................................................................................................................................... 65
Operating Temperature ....................................................................................................................... 65
Storage Temperature ........................................................................................................................... 66
Shock ................................................................................................................................................... 66
Vibration ............................................................................................................................................... 66
Weight .................................................................................................................................................. 66
Case Size ............................................................................................................................................. 66
Time Overcurrent Characteristic Curves ................................................................................................ 67
Revision History ...................................................................................................................................... 105

Introduction

BE1-51/27R Time Overcurrent Relays are microprocessor -based devices that provide voltage restraint of the phase time overcurrent function. With voltage restraint, the current pickup decreases proportionately with decreasing voltage over the rated voltage range. Instantaneous overcurrent element(s) and the neutral time overcurrent element, when supplied, operate independently of the voltage restraint function. Each relay is available with one, three, or four time overcurrent elements.

Application

Voltage restraint provides an added means of discriminating between load and fault conditions. This allows the time overcurrent pickup to be set below the maximum load (or swing) current. This feature permits the relay to provide dual protection on a generator. For example, either backing up the differential protection for generator faults and/or backing up other relays external to the generator zone. As a back­up function, it must be set with a relatively long delay. Prior to relay time-out, the synchronous impedance of the generator may be limiting fault current to a level comparable to rated. If the regul ator is not in service to boost excitation, the steady-state fault current, even for a fault on the machine terminals, will usually be less than rated. The relay pickup must be below generator rated current to insure dependable operation.

Backup Protection

This relay is useful for generator time overcurrent back-up protection for other relaying external to the system. It also provides primary (first line) phase fault protection for small generators not equipped with differential protection.
Phase overcurrent units should be supplied on all three phases. Either three single-phase relays or one three-phase relay when the objective is to protect for phase-phase faults on the other side of a delta-wye power transformer. Currents at the relay for a three-phase fault are in the proportions of 2:1:1 in the three phases, so only one phase sees the higher curr ent lev el. For this app licat io n, eac h phas e time­overcurrent element should be restrained by the phase-to-ground voltage on its phase, rather than by the phase-phase voltage.
Following fault inception, current varies continuously as the field current decays. In addition, for other than a bolted fault on the terminals of a generator, the voltage will not be zero and will vary with time as the fault current decays. If the restraint voltage is between 25 and 100 percent, the time overcurrent element pickup will also vary with the time because of the changing voltage. Because the pickup varies with time, the multiples of pickup, and therefore the timing, will also change. These factors must be considered when coordinating with external protective devices. Section 4 of this manual provides additional coordination information in the paragraphs on setting the relay.
Instantaneous overcurrent elements would not ordinarily be used for a generator back-up function. They would not have acceptable operation for faults external to the generator zone.
Because the phase time-overcurrent pickup will be less than the maximum non-fault current, the relay can misoperate if the voltage signal is interrupted (e.g., a blown voltage transformer fuse). Where two sources of signal voltage are available, the BE1-60 Voltage Balance relay can prevent such a misoperation. This relay compares the output of two signal sources to detect an anomaly in one of these sources and block the operation of those devices connected to that signal source.

Residually Connected

A neutral (ground) overcurrent element can be applied and connected residually to a set of three current transformers on solidly grounded applications or on impedance grounded systems that provide ground fault current approximating rated current level. The neutral element can also be connected to a 10/1 ampere, zero-sequence window current transformer to provide protection on systems producing a minimum of about 20 amperes primary current. Still another alternative would be connecting this device to a current transformer in the neutral of a generator.
Fault
Current
System Voltage
Effective
Pickup
Multiples of
Pickup
Approximate Trip
Time
4.25 A
100%
5.0 A
<1.0
No Trip
4.25 A
50%
2.5 A
1.7
1.499 s
4.25 A
0%
1.25 A
3.4
0.507 s
7.50 A
100%
5.0 A
1.5
1.873 s
7.50 A
50%
2.5 A
3.0
0.772 s
7.50 A
0%
1.25 A
6.0
0.474 s
15.00 A
100%
5.0 A
3.0
0.772 s
15.00 A
50%
2.5 A
6.0
0.474 s
15.00 A
0%
1.25 A
12.0
0.355 s
Time Dial Setting (Seconds)
00
01
02
03
05
07
10
0.38
1.50
0.604
0.856
1.111
1.370
1.873
2.384
3.142
0.43
1.70
0.480
0.688
0.899
1.104
1.499
1.930
2.504
0.50
2.00
0.382
0.539
0.705
0.866
1.194
1.517
1.994
0.55
2.20
0.344
0.484
0.633
0.775
1.063
1.349
1.780
0.63
2.50
0.300
0.419
0.548
0.663
0.918
1.168
1.542
0.68
2.70
0.278
0.387
0.508
0.620
0.850
1.073
1.420
0.75
3.00
0.250
0.354
0.461
0.561
0.772
0.977
1.284
0.88
3.50
0.218
0.308
0.403
0.494
0.672
0.855
1.127
1.00
4.00
0.202
0.281
0.360
0.445
0.602
0.772
1.016
1.13
4.50
0.186
0.261
0.334
0.410
0.557
0.709
0.936
1.25
5.00
0.176
0.243
0.308
0.377
0.506
0.649
0.831

Operating Characteristics at Reduced Voltages

BE1-51/27R relays adjust the operating parameters based on system voltage. The sensitivity of the relay is increased as the system voltage drops. This provides a means of discriminating between load and fault conditions.
A decrease of the sensed voltage to a point between 100 percent and 25 percent of nominal results in a proportional decrease in the time overcurrent pickup point. Thus, at 50 percent nominal voltage, the time overcurrent relay will pickup at 50 percent of the setting (TAP + Calibration). At voltages above 100 percent nominal, the pickup will be the same as the setting. At voltages below 25 percent of nominal, the pickup will be 25 percent of the setting. Note that the BE1-51/27R is designed to trip at currents less than the setting if the voltage is depressed.
The timing characteristics of the BE1-51/27R continue to operate on multiples of pickup basis. Pickup refers not to the setting, but to the operating point as adjusted for voltage. Thus, with a setting of 5.0 amperes, and system voltage of 50 percent, a current of 5.0 amperes represents 2 times pickup. For a given fault current magnitude, the relay will trip faster at reduced voltage, because the multiples of pickup increases.
Table 1 shows the timing characteristics at normal and reduced voltages. The curve is B4 and the time dial is five. The pickup is five amperes. Tables 2 and 3 show the timing characteristics for multiples of setting as it relates to multiples of pickup with the BE1-51/27R at 25 percent voltage.
Table 1. Timing, Characteristic Curve B4, with BE1-51/27R at 100% and 50% Voltages
Table 2. Timing, Curve B4, BE1-51/27R at 25% Voltage (00 to 10 Time Dial Settings)
Multiple of
Setting
Multiple of
Pickup
Time Dial Setting (Seconds)
00
01
02
03
05
07
10
1.50
6.00
0.159
0.220
0.285
0.347
0.474
0.599
0.790
1.75
7.00
0.151
0.204
0.263
0.320
0.435
0.553
0.727
2.00
8.00
0.142
0.191
0.246
0.300
0.412
0.520
0.683
2.25
9.00
0.136
0.185
0.240
0.290
0.939
0.499
0.654
2.50
10.00
0.130
0.180
0.227
0.277
0.372
0.477
0.622
3.00
12.00
0.123
0.170
0.215
0.262
0.355
0.453
0.593
3.50
14.00
0.118
0.163
0.208
0.250
0.341
0.433
0.566
4.00
16.00
0.117
0.159
0.201
0.243
0.329
0.420
0.548
4.50
18.00
0.112
0.153
0.195
0.237
0.322
0.406
0.537
5.00
20.00
0.111
0.154
0.188
0.231
0.316
0.400
0.526
Time Dial Setting (Seconds)
20
30
40
50
60
80
99
0.38
1.50
5.671
8.222
10.788
13.344
15.919
20.918
25.707
0.43
1.70
4.533
6.556
8.527
10.662
12.694
16.698
20.464
0.50
2.00
3.593
5.207
6.808
8.407
9.986
13.164
16.276
0.55
2.20
3.198
4.636
6.041
7.482
8.906
11.694
14.486
0.63
2.50
2.766
4.003
5.218
6.454
7.682
10.146
12.453
0.68
2.70
2.569
3.720
4.848
5.986
7.130
9.381
11.557
0.75
3.00
2.322
3.358
4.372
5.409
6.434
8.489
10.454
0.88
3.50
2.026
2.931
3.829
4.726
5.627
7.406
9.120
1.00
4.00
1.833
2.647
3.450
4.258
5.076
6.688
8.214
1.13
4.50
1.691
2.438
3.188
3.932
4.673
6.166
7.597
1.25
5.00
1.464
2.117
2.749
3.380
4.022
5.303
6.513
1.50
6.00
1.424
2.060
2.688
3.314
3.949
5.200
6.396
1.75
7.00
1.318
1.897
2.479
3.060
3.644
4.802
5.899
2.00
8.00
1.234
1.792
2.329
2.884
3.430
4.518
5.561
2.25
9.00
1.184
1.704
2.229
2.748
3.273
4.298
5.290
2.50
10.00
1.120
1.604
2.093
2.589
3.070
4.053
4.977
3.00
12.00
1.073
1.551
2.018
2.498
2.971
3.917
4.817
3.50
14.00
1.028
1.481
1.928
2.390
2.841
3.741
4.603
4.00
16.00
0.989
1.430
1.866
2.304
2.741
3.610
4.443
4.50
18.00
0.958
1.392
1.818
2.243
2.667
3.514
4.328
5.00
20.00
0.944
1.372
1.786
2.200
2.619
3.454
4.252
Multiple of
Setting
Multiple of
Setting
Multiple of
Pickup
Table 3. Timing, Curve B4, BE1-51/27R at 25% Voltage (20 to 99 Time Dial Settings)
Multiple of
Pickup

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. They are: Characteristic curves:
• Seven inverse time
• Nine I
• Seven inverse time with extended timing range
• Nine I
• 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
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) integrating exten ded B and C
curves:
• Seven integrating inverse time with extended timing range
• Nine integrating I
2
t with extended timing range
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 desti nat ion from 00 to 99. Because of space limitations, each graph shows only 14 of the 100 possible selections.

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) switch mounted 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.

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 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.
Relay circuits provide a voltage restraint circuit that varies the selected time overcurrent pickup point proportional to the monitored voltage. As the monitored voltage varies between 100 percent and 25 percent of nominal, the pickup point for each phase varies between 100 percent and 25 percent. Nominal voltage is 100 Vac for 50-hertz systems and 120 Vac for 60-hertz systems. Neutral time overcurrent elements are not restrained. Three-phase voltages are measured phase-to-phase for three wire connections and phase-to-neutral for four wire connections.

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 panel control (INST 1 or INST 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.

Model and Style Number Description

Electrical characteristics and operational features included in a particular style of the BE1-51/27R 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 U3E-Z1P-B1C1F, the device would have the following characteristics:
U - Three-Phase-and-Neutral sensing, 3-p has e, 4-wire voltage restraint 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 1 - One instantaneous element C - Push-to-energize outputs 1 - Normally open auxiliary timed output relay F - Semi-flush mounting
Figure 1. Style Number Identification Chart

Controls and Indicators

BE1-51/27R 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 4. Your relay may not have all of the controls and indicators shown and described here.
Figure 2. Location of Controls and Indicators
10 9137200999 Rev F
Table 4. 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. Your relay may be equipped with a Phase Instantaneous 2 Control which provides similar adjustment of the phase instantaneous 2 element trip setting.
D 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.
E 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).
F 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.
G Tap Selector Table. This front-panel reference lists the high and low setting limits for a particular tap
selection. H Target Reset Switch. Operating this switch resets all active targets (locator E). I Power Ind ic ator. This LED indicator lights when control power is applied and the relay power supply is
functioning. J Timing Indicators. A Timing LED lights when the corresponding overcurrent pickup point is reached
and exceeded. K 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. L Neutral Tap Calibration Control. This single-turn potentiometer adjus ts the phase over c urr ent pickup
threshold between the selected neutral tap setting and the next lower tap setting. M Neutral Tap Selector. Selects the neutral overcurrent pickup point in conjunction with the front panel
Neutral Tap Calibration Control (locator L). N 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 M)
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 5.
9137200999 Rev F 11
Table 5. 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).
12 9137200999 Rev F
Refer to Table 6 for target installation configurations.
Table 6. 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
M, N
R, S
U, W
B, C
E, F
Y, Z
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
9137200999 Rev F 13

Functional Description

BE1-51/27R Time Overcurrent Relays are microprocessor-based devices that provide voltage restraint of the phase time 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
14 9137200999 Rev F

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.

Voltage Sensing

Input voltage for each phase to be monitored is applied to the voltage sensing circuits. Each voltage sensing circuit consists of an input transformer, rectifier, and filter Analog voltages from the voltage sensing circuits are applied to the multiplexor. Note that neutral is not monitored for voltage.

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

When the voltage representing the actual sensed inputs meets or exceeds the selected pickup point, this circuit converts the level to a corresponding binary number and applies it to a time trip comparator and scaler circuit and to a counter for calculation of the required time delay.

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.
9137200999 Rev F 15
V
V
I
I
M
N
t
×=

Voltage Restraint

Voltage restraint compares the binary number representing the monitored voltage with the fixed nominal voltage limit (100 Vac for 50-hertz systems and 120 Vac for 60-hertz systems). When the voltage is between 100 percent and 25 percent of the nominal voltage, the circuit automatically lowers the selected time overcurrent pickup point proportionally. Instantaneous overcurrent operation, if present, is not affected. Neutral is not monitored for voltage, nor is the neutral time overcurrent pickup point restrained. When the voltage is above the 100 percent limit, the pickup point is restrained to 100 percent. When the voltage is below the 25 percent limit, the pickup point remains at the 25 percent point.
For a given level of current above pickup, a lowering of the pickup point, via voltage restraint effectively increases the multiples of current. This shifts the time delay characteristic to the right on the multiples-of­pickup-current axis (characteristic curves) as voltage drops from 100 percent to 25 percent.
To find the effective multiple of pickup current use the formula:
Where: M = Multiple of tap value current I = Applied current level I V
= Tap value
T
= Nominal voltage
N
V = Applied voltage level

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 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 will be tripped, 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 EL EM ENT 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
16 9137200999 Rev F
Note
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.
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 ind ic at or 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, BE1-51/27R target ind ic ators co ns isted of magnetically latched, disc indicators. These mechanically latch ed target indicators have been replaced by the electronically latched LED targets in use today.
9137200999 Rev F 17
Caution
Note

Installation

BE1-51/27R 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 BE1-51/27R 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 BE1-51/27R 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.
18 9137200999 Rev F
Figure 4. Panel Cutting/Drilling, Semi-Flush, S1 Case
9137200999 Rev F 19
Figure 5. S1 Case Dimensions, Rear View, Double Ended, Semi-Flush Mount
20 9137200999 Rev F
.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
9137200999 Rev F 21
Figure 7. S1 Case Dimensions, Rear View, Single Ended, Semi-Flush Mount
22 9137200999 Rev F
.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
9137200999 Rev F 23
Figure 9. Panel Cutting/Drilling, Double Ended, Projection Mount, S1 Case
24 9137200999 Rev F
Figure 10. S1 Case Dimensions, Rear View, Double Ended, Projection Mount
Loading...
+ 84 hidden pages
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use