Basler BE1-87B User manual

INSTRUCTION MANUAL
FOR
BUS DIFFERENTIAL RELAY
BE1-87B
Publication Number: 9282300990
Revision: L 02/07
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9282300990 Rev L BE1-87B Introduction i
INTRODUCTION
This manual provides information concerning the operation and installation of a BE1-87B Relay. To
accomplish this, the following is provided.
•Specifications
•Functional Description
•Installation Information
•Testing Procedures
WARNING!
To avoid personal injury or equipment damage, only qualified personnel should perform
the procedures presented in this manual.
CAUTION
Meggers and high potential test equipment should be used with extreme care. Incorrect
use of such equipment could damage components contained in the device.
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ii BE1-87B Introduction 9282300990 Rev L
First Printing: June 1999
Printed in USA
Copyright © 1999-2001, 2003, 2005-2007 Basler Electric Co., Highland, IL 62249
February 2007
CONFIDENTIAL INFORMATION
Of Basler Electric, Highland, IL. 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, Highland, Illinois.
BASLER ELECTRIC
ROUTE 143, BOX 269
HIGHLAND, IL 62249 USA
http://www.basler.com, [e-mail]
PHONE [phone] FAX [phone]
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9282300990 Rev L BE1-87B Introduction iii
PRODUCT REVISIONS
The following information provides a historical summary of the changes made to the hardware and
instruction manual of the BE1-87B Bus Differential Relay. All revisions are listed in chronological order.
Hardware Version Change
⎯Initial release.
A Enhanced temperature stability and SWC immunity in single-phase relays.
B New circuit board design released for single-phase relays.
C Applied Revision A enhancements to three-phase relays with new circuit board design.
D Improved immunity to ESD.
E CT Test pushbutton changed to “pillow-type” switch. Optional case cover with CT Test
pushbutton access introduced.
F Improved relay stability during cycling of operating power.
G Corrected labeling for CR1 and CR3 polarity on the SCR circuit board.
H Not released to production.
I Revision designator I not used.
J Improved stability of Relay Trouble output contacts during power-up/power-down.
Manual Version Change
⎯Initial release.
A Corrected various errors in the illustrations.
B Added and updated drawings throughout the manual to accommodate the three-phase
version of the BE1-87B.
C Section 1: Added UL recognition to specifications. Changed voltage rating specification
from “75% of tap setting” to “300 Vac for 1 hour”.
Section 2: Corrected equation reference under Sample Calculation.
Section 4: Revised Figures 4-1 and 4-2 to show proper position of the Reset button
access on the S1 case.
Changed all power supply status references from “Relay Trouble Alarm” to “Power
Supply Status”.
D Updated drawings, as required, to reflect changes to the cases and overlays as a result
of “pillow-type” switch implementation for CT Test pushbutton.
Updated the style chart with front cover with CT test access option.
E Corrected the terminal numbering in Figure 2-5.
Changed the Power Supply Status Contacts label to Relay Trouble Contacts in Figures
4-13 and 4-14.
Corrected various minor errors throughout the manual.
F Information was added to Section 2, Application.
Moved CT circuit testing information from Section 3, Human-Machine Interface to
Section 5, Testing.
Moved illustration of Figure 3-3 to Section 4, Installation and added terminal
designations.
Added metric equivalents and mounting depth dimension to Figure 3-4 and moved
illustration to Section 4, Installation.
Corrected various minor errors throughout manual.
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iv BE1-87B Introduction 9282300990 Rev L
Manual Version Change
G Clarified wording of timing specification in Section 1, General Information and removed
Figure 1-3.
Reworded first paragraph of Section 2, Application and last paragraph of Sample
Calculation sub-section.
Removed the polarity marks from terminals 15 and 16 of Figures 4-14 and 4-15.
H Added Two Different Ratio CTs paragraph to Section 2, Application.
Added information to Internal Faults paragraphs in Section 2, Application.
Improved Figure 2-7.
J Improved Figure 2-7.
K Added option “R” mounting type to Style Number. Updated Output Contact ratings in
Section 1. Added 19” Horizontal Rack-Mount Front and Side views to Section 4,
Installation. Added GOST-R certification to Section 1, General Information,
Specifications.
L Updated Intentional Delay Jumper instructions on pages 2-11 and 3-5.
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9282300990 Rev L BE1-87B Introduction v
CONTENTS
SECTION 1 •GENERAL INFORMATION ................................................................................................ 1-1
SECTION 2 •APPLICATION....................................................................................................................2-1
SECTION 3 •HUMAN MACHINE INTERFACE ....................................................................................... 3-1
SECTION 4 •INSTALLATION .................................................................................................................. 4-1
SECTION 5 •TESTING ............................................................................................................................ 5-1
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9282300990 Rev L BE1-87B General Information i
SECTION 1 • GENERAL INFORMATION
TABLE OF CONTENTS
SECTION 1 • GENERAL INFORMATION................................................................................................1-1
GENERAL............................................................................................................................................1-1
FEATURES..........................................................................................................................................1-1
Standard Features..........................................................................................................................1-1
MODEL AND STYLE NUMBER..........................................................................................................1-1
Style Number Example...................................................................................................................1-2
SPECIFICATIONS...............................................................................................................................1-2
Current and Voltage Settings..........................................................................................................1-3
Frequency.......................................................................................................................................1-3
Pickup Accuracy .............................................................................................................................1-3
Current Rating ................................................................................................................................1-3
Voltage Rating ................................................................................................................................1-3
Targets............................................................................................................................................1-3
Isolation...........................................................................................................................................1-3
Surge Withstand Capability (SWC) ................................................................................................1-3
Impulse Test ...................................................................................................................................1-3
Radio Frequency Interference........................................................................................................1-3
Electrostatic Discharge (ESD)........................................................................................................1-4
UL Recognition ...............................................................................................................................1-4
GOST-R Certification......................................................................................................................1-4
Environment....................................................................................................................................1-4
Shock..............................................................................................................................................1-4
Vibration..........................................................................................................................................1-4
Weight.............................................................................................................................................1-4
Case Size........................................................................................................................................1-4
Figures
Figure 1-1. BE1-87B Style Chart...............................................................................................................1-1
Figure 1-2. Typical Pickup Current Response Time without a Trip Delay ................................................1-2
Tables
Table 1-1. BE1-87B Power Supply Specifications....................................................................................1-2
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9282300990 Rev L BE1-87B General Information 1-1
SECTION 1 • GENERAL INFORMATION
GENERAL
The BE1-87B is a high-speed, high-impedance, solid-state differential relay. It was designed specifically
for bus differential protection. Because of the relay’s high impedance, it can be used in other applications,
such as the protection of shunt reactors. Contact your local Basler Applications Engineer for information
about additional applications.
FEATURES
The BE1-87B offers high-speed fault protection, which may be applied to individual elements or zones of
ac power systems. It operates in less than 7 milliseconds for fault levels of 1.5 times the current pickup
and less than 5.5 milliseconds for fault levels above six times the current pickup. This high-speed
operation minimizes potential damage to the protected equipment. Response characteristics for sensing
input ranges one and two are shown in Section 5, Testing.
Standard Features
Available in single-phase or three-phase models
•S1 and M1 double ended drawout cases and 19” rack-mount
•Percent of pickup voltage alarm
•Differential logic test
•LED trip output indicators
•Power supply status
•Ten position incremental adjust for the voltage and current pickup settings
MODEL AND STYLE NUMBER
The electrical characteristics and operational features included in a specific relay are defined by a
combination of letters and numbers, which constitutes the device’s style number. The style number
together with the model number describes the features and options in a particular device and appears on
the front panel as the item number. They also appear in the drawout cradle, and inside the case
assembly. The model number BE1-87B designates the relay as a Basler Electric Class 100, high-
impedance bus differential relay.
Figure 1-1. BE1-87B Style Chart
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1-2 BE1-87B General Information 9282300990 Rev L
Style Number Example
The style number identification chart defines the electrical characteristics and operation features included
in the BE1-87B relay. For example, if the style number were BE1-87B S5AA1YN0N0F, the device would
have the following:
BE1-87B
S..........Single-phase current sensing
5..........5 ampere current sensing input range
A..........Front case cover with CT test button access
A1........Instantaneous timing
Y..........48/125 Vac/Vdc power supply
N .........No Option
N .........No Option
N .........No Option
0..........No Option
F..........Semi-flush case mounting
SPECIFICATIONS
Timing
A maximum of seven milliseconds at 1.5 times the pickup setting.
A maximum of 5.5 milliseconds above six times the pickup setting.
Figure 1-2 illustrates typical response times.
Figure 1-2. Typical Pickup Current Response Time without a Trip Delay
Power Supply
Power for the internal circuitry may be obtained from either an ac or a dc external power source as
indicated in Table 1-1.
Table 1-1. BE1-87B Power Supply Specifications
Type Nominal Input Voltage Input Voltage Range Burden at Nominal (Maximum)
Y 48/125 Vdc
110Vac 24 to 150 Vdc 90 to 132 Vac 7.5 W 15.0 VA
Z 125/250 Vdc
110/230Vac 60 to 250 Vdc 90 to 230 Vac 7.5 W 20.0 VA
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9282300990 Rev L BE1-87B General Information 1-3
Current and Voltage Settings
Voltage Alarm Pickup: 10 to 80% in 10% increments
Voltage Pickup: 50 to 400 V in 50 V increments
Current Pickup: 0.25 to 2.5 A in 0.25 A increments
Frequency
Nominal 50 or 60 Hz, + 5 Hz
Pickup Accuracy
±5% of the setting over the operating ranges for both current and voltage. Pickup accuracy over the
±5 Hz nominal frequency variation is within ±8% of the nominal frequency value.
Output Contacts
Output contacts are rated as follows.
Resistive
120 Vac: Make, break, and carry 7 Aac continuously
250 Vdc: Make and carry 30 Adc for 0.2 s, carry 7 Adc continuously, break
0.3 Adc
500 Vdc: Make and carry 15 Adc for 0.2 s, carry 7 Adc continuously, break
0.3 Adc
Inductive
120 Vac, 125 Vdc, 250 Vdc: Break 0.3 A (L/R = 0.04)
Current Rating
Continuous: 10 A rms
1 second, symmetrical: 160 A rms
5 cycles, symmetrical: 480 A rms
2 cycles, fully offset: 215 A
Voltage Rating
The nature of the BE1-87B relay’s application is that voltage is not applied continuously. For calibration
and test purposes, it may be of value to apply input voltage for a longer duration than the few
milliseconds that would typify an internal or external power system fault. For test and calibration
purposes, the BE1-87B has been designed to withstand 300 Vac for a maximum duration of 60 minutes.
Targets
LED indication (Trip LED) is latched with an internal, mechanical latching relay. Reset is accomplished by
pressing the Reset button on the front panel.
Isolation
In accordance with IEC 255-5 and IEEE C37.90, one-minute dielectric (high potential) tests were
performed as follows.
All circuits to ground: 2000 Vac or 2828 Vdc
Each circuit to all other circuits: 2000 Vac or 2828 Vdc.
Surge Withstand Capability (SWC)
Oscillatory and Fast Transient: Qualified to IEEE C37.90.1-1989
Impulse Test
Qualified to IEC 255-5.
Radio Frequency Interference
Maintains proper operation when tested for interference in accordance with IEEE C37.90.2 1995.
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1-4 BE1-87B General Information 9282300990 Rev L
Electrostatic Discharge (ESD)
In accordance with IEEE C37.90.3, contact discharges of 8 kilovolts and air discharges of 15 kilovolts
were applied with no misoperation occurring.
UL Recognition
Recognized per Standard 508, UL File Number E97033.
Note that output contacts are not UL recognized for voltages greater than 250 V.
GOST-R Certification
GOST-R certified No. POCC US.ME05.B03391; complies with the relevant standards of Gosstandart of
Russia. Issued by accredited certification body POCC RU.0001.11ME05.
Environment
Temperature
Operating Range: −40°C to 70°C (−40°F to 158°F)
Storage Range: −40°C to 85°C (−40°F to 185°F)
Humidity
Qualified to IEC 68-2-38, First Edition 1974
Shock
Qualified to IEC 255-21-2, Class 1.
Vibration
Qualified to IEC 255-21-1, Class 1.
Weight
1-phase Relay: 14.3 lb (6.5 kg) maximum
3-phase Relay: 19.2 lb (8.8 kg) maximum
Case Size
1-phase Relay: S1
3-phase Relay: M1 or 19” Rack-Mount
Case dimensions are provided in Section 4, Installation.
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9282300990 Rev L BE1-87B Application i
SECTION 2 •APPLICATION
TABLE OF CONTENTS
SECTION 2 •APPLICATION....................................................................................................................2-1
APPLICATION .......................................................................................................................................2-1
Application with Lightning Arresters...................................................................................................2-1
Application with a Lockout Function................................................................................................... 2-1
Current Source for High Impedance Differential Relaying.................................................................2-1
BE1-87B FLEXIBILITY...........................................................................................................................2-2
Bus Protection Application .................................................................................................................2-2
Shunt Reactor Protection Application ................................................................................................2-4
Mixing Two Different Ratio CTs..........................................................................................................2-5
General Settings Guidelines...............................................................................................................2-5
OPERATING PRINCIPLES ...................................................................................................................2-5
External Faults ...................................................................................................................................2-6
Internal Faults.....................................................................................................................................2-7
CHARACTERISTICS...........................................................................................................................2-10
Differential Voltage Pickup...............................................................................................................2-10
Differential Pickup Current ...............................................................................................................2-10
Alarm Voltage Pickup.......................................................................................................................2-10
Trip Test Pushbutton........................................................................................................................2-11
CT Test Pushbutton .........................................................................................................................2-11
Power LED .......................................................................................................................................2-11
Intentional Delay Jumper..................................................................................................................2-11
Operating Times...............................................................................................................................2-11
CALCULATION OF SETTINGS...........................................................................................................2-12
Calculation of Voltage Differential Settings......................................................................................2-12
Bus Protection..................................................................................................................................2-12
Shunt Reactor Protection.................................................................................................................2-13
Application with Mixed Multi-Ratio CTs............................................................................................2-13
Current Element Setting...................................................................................................................2-13
Minimum Fault to Trip (Voltage Element).........................................................................................2-14
SAMPLE CALCULATION....................................................................................................................2-15
CT TEST CIRCUIT CALCULATIONS..................................................................................................2-16
General.............................................................................................................................................2-16
Definition of Terms ...........................................................................................................................2-16
Calculation Steps .............................................................................................................................2-17
Example Calculation.........................................................................................................................2-17
Figures
Figure 2-1. External AC Connections for Bus Protection..........................................................................2-3
Figure 2-2. External DC Connections for Bus Protection..........................................................................2-4
Figure 2-3. External AC Connections for Shunt Reactor Protection, Multi-Phase and Line-to-Ground
Faults.........................................................................................................................................................2-4
Figure 2-4. External AC Connections for Shunt Reactor Protection, Ground Faults................................ 2-5
Figure 2-5. Illustration of Single Line-to-Ground Fault at Location F1 ......................................................2-7
Figure 2-6. Typical Secondary Excitation for 1200/5 Bushing Current Transformer.................................2-8
Figure 2-7. Simplified Internal Connection Diagram for BE1-87B Relay...................................................2-9
Figure 2-8. Voltage Appearing Across Full Winding of CT......................................................................2-10
Figure 2-9. Voltage Appearing Across Full Winding of CT......................................................................2-17
Figure 2-10. Voltage Appearing Across Full Winding of CT....................................................................2-18
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9282300990 Rev L BE1-87B Application 2-1
SECTION 2 •APPLICATION
APPLICATION
The BE1-87B solid-state, high-speed, high-impedance differential relay is available in single or three-
phase models. The relay was specifically designed to provide high-speed differential protection for high
voltage buses, critical medium, and low voltage buses. Because of its design and sensitivity, the relay can
also be used for shunt reactor protection. While bus schemes require three-phase protection, shunt
reactors may be protected with only one single-phase relay for ground faults. Regardless of the scheme
employed or the equipment protected, the following applications apply to the BE1-87B relay.
Application with Lightning Arresters
The BE1-87B is a high-speed relay designed to operate in a half-cycle or less. As a result, applying the
relay to a bus with lightning arresters must be addressed. The relay pickup current range is adjustable
between 0.25 to 2.5 amperes rms. If lightning arresters will be connected to the bus, use the 2.5 ampere
sensitivity setting so as to prevent the possibility of a differential operation during a normal arrester
operation. If no lightning arresters are used, start with the 0.5 ampere sensitivity setting and adjust as the
application dictates.
Application with a Lockout Function
Contacts from the lockout relay (86) should be connected across terminals 5 and 6 (single-phase or
phase A for 3-phase models), 3 and 4 (phase B), and 1 and 2 (phase C) of the BE1-87B relay to short-
circuit the SCRs in the input circuit after a trip output has been initiated. This allows the relay to continue
operation as a conventional overcurrent relay and at the same time protect against exceeding the short-
time rating of the internal SCRs. The relay can be used in any application where the total secondary
current is not more than the current waveform of a fully-offset fault with 215 amperes rms symmetrical
available, provided the lockout relay (86) has an operate time of 1 cycle or less (16 milliseconds).
Current Source for High Impedance Differential Relaying
Predictable current transformer (CT) performance is critical to the effective operation of a high impedance
differential scheme. Where practical, the following current transformer guidelines should be applied when
using the BE1-87B relay.
•All CTs should be of toroidal design and be fully distributed around the core.
•All CTs should have the same full ratio value and be connected to the full ratio taps.
•All CTs should have the same voltage rating, accuracy class, and thermal rating.
•The CTs should be dedicated to the differential application.
•When adding to an existing differential scheme, at least one set of CTs in the new breaker should be
ordered with the same ratio and accuracy class as the differential CTs used in the existing scheme.
•CTs cannot have primary or secondary voltage limiting devices, as the resulting short-circuit could
cause an unwanted operation of the differential.
CAUTION
If lightning arresters are added to an existing bus, as might be the case when
adding a transformer, be sure to increase the Pickup Current setting of the BE1-
87B to the 2.5 ampere setting.
CAUTION
If the BE1-87B relay control power (power supply voltage) is removed, relay
terminals 5 and 7 (single-phase model) or 5 and 7, 3 and 7, and 1 and 7 (three-
phase model) should be shorted by pulling the connection plug. If this is not
done, the BE1-87B relay could be damaged due to continuous fault current
flowing through the relay SCRs.
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2-2 BE1-87B Application 9282300990 Rev L
BE1-87B FLEXIBILITY
Because of the flexible wide range design of the BE1-87B, it is possible to apply the relay in situations
where the current sensing input circuit is less than ideal. It should be noted, however, that the possibility
of less sensitive settings, equipment overvoltage, or false operation could result. Careful review of the
following application notes is recommended:
•It is possible to use a mixture of multi-ratio CTs, however, it is essential that the tapped value has the
same turns ratio as the other parallel CTs in the circuit. When taps are selected other than full ratio,
use the highest available tap setting that will allow all CTs in the scheme to have the same turns ratio.
Tap settings other than full ratio require a calculation of the peak voltage developed across the full
winding resulting from autotransformer action. The resulting voltage should not exceed the insulation
breakdown values of the connected equipment. The equation for this calculation is derived in the
paragraph on operating principles in this section and repeated in the paragraphs on Calculation of
Settings.
•All CTs used in the differential circuit should have negligible leakage reactance on the connected
taps. Most, if not all, multi-ratio internal, bushing, and column type CTs made in the last 30 years
meet this requirement. All CTs wound on toroidally shaped cores meet this requirement if the
windings (on the tap used) are completely distributed around the core (consult your CT manufacturer
if you have questions). It may be possible to use CTs that do not meet this requirement if the leakage
reactance is known. The leakage reactance is added algebraically to the resistance of the CT circuit
in question. Less sensitive protection will occur as a result of a higher pickup setting.
•It may be possible, although not recommended, to use the differential circuit CTs jointly for other
functions as long as an accurate impedance of the other function is known. The performance of the
system under these conditions can be calculated by algebraically adding the other impedance to the
CT winding and cable resistance. Less sensitive protection will occur as a result of a higher pickup
setting. Also, consideration must be given to the hazards of false operation due to extra connections
and errors in testing the added devices. To ensure proper relay setting, all cable and CT secondary
winding resistances should be evaluated before a decision is made to add other devices to the BE1-
87B CT circuits.
Bus Protection Application
Three single-phase BE1-87B relays or one three-phase BE1-87B relay and an auxiliary lockout relay (86),
provide a complete multi-phase and ground bus fault protection package. Typical external connections to
the relays are shown in Figures 2-1 and 2-2. The connections are illustrated for a bus with three circuits,
but the protection can easily be extended if more circuits are added to the bus. For additional circuits, it is
only necessary to connect the CTs associated with the added circuits to the respective junction points
and to connect the contacts of the lockout relay in the respective trip circuits. The relay voltage tap setting
is based on the maximum voltage that can be developed across the differential junction point during an
external fault. Calculation of the maximum voltage is easily made and methods for doing so are given in
the paragraph under calculation of settings. A sample calculation for a bus differential scheme is also
provided.
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9282300990 Rev L BE1-87B Application 2-3
TO SURGE
GROUND
52-1
52-3 52-2
321
3
2
1
3
2
1
TO SURGE
GROUND
Single Phase
87B- 1
RELAY HOUSE
GROUND
TO SURGE
GROUND
D2853-3
5-26-99
86 5
67
86 5
67
86 5
67
Single Phase
87B- 2
Single Phase
87B- 3
86 86 86
Three Phase
87B Relay
1
23
4
5
6
7
N123
Surge
Ground
Figure 2-1. External AC Connections for Bus Protection
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2-4 BE1-87B Application 9282300990 Rev L
86 86 86
BLOCK AUTOMATIC
RECLOSING
86
87
86
87
52-1
52-252-1 52-3
52-2 52-3
86 86 86
a
aa
TC TC
TC
(+)
(-)
D2853-4
5-24-99
87 - BE1-87B BUS DIFFERENTIAL RELAY
86 - LOCKOUT RELAY
15
16
17
18 TRIP 1
OUTPUT
TRIP 2
OUTPUT
19
20
87 13
14
VDIFF
ALARM
11
12
RELAY
TROUBLE
TO 2 AND 3
SINGLE PHASE RELAYS TO 2 AND 3
SINGLE PHASE RELAYS
Figure 2-2. External DC Connections for Bus Protection
Shunt Reactor Protection Application
Differential protection of shunt reactors may be provided by using only one single-phase BE1-87B relay,
three single-phase relays, or one three-phase relay. Typical ac external connection diagrams for these
schemes are shown in Figures 2-3 and 2-4. The dc connections will be similar to those shown in Figure 2-
2. Only ground fault protection will be provided when one relay is applied. Application of either three-
phase arrangement will provide both multi-phase and phase-to-ground fault protection. Calculation of the
voltage tap setting is basically the same as for the bus application. The procedures for calculating the
voltage tap setting for either scheme are provided under Calculation of Settings.
BE1 - 87B
86
BE1 - 87B
86
BE1 - 87B
86
1
2
3
01
0203
86 - LOCKOUT RELAY
* TO SURGE GROUND
*
*
*
1
2
3
D2853-5
5-25-99
5
6
7
5
6
7
5
6
7
86 86 86
Three Phase
87B Relay
1
23
4
5
6
7
N123
*
Figure 2-3. External AC Connections for Shunt Reactor Protection,
Multi-Phase and Line-to-Ground Faults
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