Basler Electric BE1-87G User Manual

INSTRUCTION MANUAL

FOR

VARIABLE PERCENTAGE

DIFFERENTIAL RELAY

BE1-87G

Publication: 9170800990 Revision: N 02/13

INTRODUCTION

This instruction manual provides information about the operation and installation of the BE1-87G Variable Percentage Differential relay. To accomplish this, the following information is provided:

 General Information and Specifications

 Controls and Indicators

 Functional Description

 Installation

 Testing and Setting

WARNING!

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

NOTE

Be sure that the BE1-87G is hard-wired to earth ground with no smaller than 12 AWG copper wire attached to the ground terminal on the rear of the unit case. When the BE1-87G is configured in a system with other devices, it is recommended to use a separate lead to the ground bus from each unit.

9170800990 Rev N BE1-87G Introduction i

First Printing: December 1985

Printed in USA

February 2013

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, info@basler.com

PHONE +1 618.654.2341 FAX +1 618.654.2351

ii BE1-87G Introduction 9170800990 Rev N

REVISION HISTORY

The following information provides a historical summary of the changes made to the BE1-87G instruction manual (9170800990). Revisions are listed in reverse chronological order.

Manual

Revision and Date

N, 02/13

M, 03/10

L, 09/07

K, 06/07

J, 05/99

H, 05/96

G, 10/91

F, 07/91

E, 07/91

 Updated case and cover drawings in Section 4.

 Changed the sensing input range specifications for pickup accuracy

in Section 1.

 Corrected labeling in Figures 4-15 and 5-5.

 Replaced magnetic type targets with electronic type targets.

 Updated power supply burden data and output contact ratings.  Updated front panel illustrations to show laser graphics.  Added dimensional drawings for single-ended cases.  Updated all applicable illustrations to show revised case covers.  Added three-phase sensing connection diagram for delta-connected

machine.

 Moved content of Section 6, Maintenance to Section 4.  Moved content of Section 7, Manual Change Information to manual

Introduction.

 Updated format of the manual.  Corrected Figure 1-2.  Corrected terminal numbering reference on page 1-4, last paragraph.  Corrected Figures 4-11 and 4-12.

 This revision letter not used.

 Added sensing input range 2 (1 Aac nominal) to the available models.  Changed high speed operation from 20 ms to 30 ms.  Changed all connection diagrams to include ground connections,

where applicable.

 Added internal connection diagrams.  Corrected Table 1-1.  Clarified setting example for motor differential application.  Added Setting Example #2.  Split Section 4 into two sections. New section is Section 5, Testing

and Setting.

 Added I  Added Figure 4-1, Stabilizing Reactor Impedance Characteristics.

 Changed pickup accuracy for Ir > 5 A from 30 A, 5% to 20 A, 8% of

the operate pickup characteristic or 150 mA, whichever is greater.

 Modified Figures 1-1 and 1-2.  Added warning information to pages 1-1 and 4-2.

t rating for stabilizer reactor.

Change

9170800990 Rev N BE1-87G Introduction iii

Manual

Revision and Date

D, 03/91

C, 03/87

B, 10/86

A, 05/86

—, 12/85

Change

 Removed On/Off switch material.  Added material documenting stabilizing reactor.  Added illustrations for typical connections, sensing input connections,

test setup, extended operational characteristics, and pickup response timing.

 Added table for current sensing burden.  Added relay setting material to Section 5.

 Added power supply status output material.

 Grammatical changes to specifications of Section 1.  Changed comparator functional description in Section 3.  Changed operational test procedure in Section 5.

 Added qualifications to specifications of Section 1.  Revised isolation test and dielectric test information in specifications

of Section 1.

 Initial release

iv BE1-87G Introduction 9170800990 Rev N

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 AND SETTING ................................................................................................... 5-1

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vi BE1-87G Introduction 9170800990 Rev N

SECTION 1 • GENERAL INFORMATION

TABLE OF CONTENTS

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

DESCRIPTION ...................................................................................................................................... 1-1

APPLICATION ....................................................................................................................................... 1-1

Variable Restraint Characteristic ........................................................................................................ 1-3

Design Highlights ............................................................................................................................... 1-3

MODEL AND STYLE NUMBER............................................................................................................. 1-3

Style Number Chart ............................................................................................................................ 1-3

Style Number Example ....................................................................................................................... 1-3

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

Current Sensing Inputs ....................................................................................................................... 1-4

Stabilizer Reactor ............................................................................................................................... 1-4

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

Operating Power Input ....................................................................................................................... 1-5

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

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

Type Tests .......................................................................................................................................... 1-6

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

Agency Recognition ........................................................................................................................... 1-7

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

Figures

Figure 1-1. Typical Single-Phase Application Scheme ............................................................................. 1-2

Figure 1-2. Typical Three-Phase Application Scheme .............................................................................. 1-2

Figure 1-3. Style Number Identification Chart ........................................................................................... 1-4

Tables

Table 1-1. Power Supply Types ................................................................................................................ 1-5

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SECTION 1 • GENERAL INFORMATION

DESCRIPTION

BE1-87G Variable Percentage Differential Relays are single- or three-phase solid-state devices designed to provide selective, high-speed, differential protection for generators, motors, and shunt reactors.

Differential relaying selectivity is based on the ability of a relay to distinguish between an internal fault (within the protected zone) and an external fault. Under normal operating conditions, the current flowing into the protected zone equals the current flowing output of the protected zone with a net operating current equal to zero. Internal faults upset this balance and result in a difference between the input and output currents. External faults have relatively little effect on the balance because the protected zone input current still equals the output current. Therefore, by comparing the currents on both sides of the protected element or zone and detecting when these currents are not equal, a differential relay acts to isolate the element or zone from the system with unsurpassed effectiveness.

BE1-87G relays typically trip a lockout (86) relay which in turn trips the generator breaker and, when present, the field and/or neutral breakers.

APPLICATION

When used with current transformers (CTs) of an accuracy class of C20, T20, or better, BE1-87G relays are recommended for the following specific applications:

• Generators:

o Any terminal voltage and a rating of 1,000 kVA and above o Any kVA rating and a terminal voltage of 5 kV and above o A terminal voltage of 2,200 V or higher and a rating of more than 500 kVA

• Motors rated at 1,500 horsepower and above

• As primary protection on shunt reactors for transmission lines

• Generator ground differential

Differential relaying is the most selective form of fault protection which may be applied to the individual elements or zones of ac power systems. Various types of differential relays and relaying systems have evolved to take advantage of the differential principle.

WARNING!

Relays manufactured prior to July 22, 1991 (EIA date code symbol 9129 and previous) do not have case jumpers between terminals 7 and 8 (single-phase units). This also applied to terminals 7 and 8, 13 and 14, and 17 and 18 of threephase relays. Exercise caution when grounding or testing current transformer circuits connected to these terminals.

Typical application schemes are illustrated in Figures 1-1 and 1-2.

9170800990 Rev N BE1-87G General Information 1-1

Figure 1-1. Typical Single-Phase Application Scheme

Figure 1-2. Typical Three-Phase Application Scheme

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Variable Restraint Characteristic

At high current levels, the inevitable difference in the saturation characteristics between current transformers indicates a need for a compensating decrease in relay sensitivity. The design of the BE187G provides a restraint factor that is proportional to input current when the restraining current (I

) is

greater than nominal (5 Aac for sensing input range 1 or 1 Aac for sensing input range 2). The BE1-87G compares the protected zone sensed input and output currents. The lesser of the two sensed current levels becomes the restraining current. The difference between the two sensed currents (the operating current) is compared to a reference established by the sensitivity setting, and adjusted by an amount proportional to the restraining current. This makes the BE1-87G more sensitive to low current internal faults, and less sensitive to external faults with high levels of through current.

When the restraining current is at nominal (5 Aac for sensing input range 1 or 1 Aac for sensing input range 2) or less, the relay trips if the differential current exceeds the relay setting (I

). But when the

restraining current is greater than nominal, the overall sensitivity is a combination of the front panel setting and the restraint factor.

Design Highlights

Some of the many advantages of the BE1-87G relay are summarized below:

• Seven sensitivity levels on each of the two sensing input ranges. The seven levels allow compensation for CT mismatch and provide the flexibility and adaptability necessary for many special applications such as split-winding generator protection.

• Stabilizing reactor. Minimizes dissimilar performance of system CTs. Reactor can be located on the back of the relay or remotely from the BE1-87G for flexibility of system installation.

• Variable restraint. The variable restraint characteristic allows increased sensitivity to low-current, internal faults while providing increased security against high levels of through-current caused by external faults.

• Single- or three-phase availability. Either configuration is available in the Basler Electric S1 draw-out case.

• High-speed operation. The BE1-87G operates in 30 milliseconds for fault levels of 10 times the sensitivity setting. This high-speed operation minimizes potential damage to the protected equipment. Response characteristics for sensing input ranges 1 and 2 are shown in Section 5, Testing and Setting.

MODEL AND STYLE NUMBER

The model number BE1-87G designates the relay as a Basler Electric, Class 100, Variable Percentage Differential Relay.

The electrical characteristics and operational features of the BE1-87G relay are defined by a combination of letters and numbers which constitutes the relay style number. The style number describes the features and options of the BE1-87G relay and appears on the front panel, draw-out cradle, and inside the case assembly.

Style Number Chart

The BE1-87G style number chart is illustrated in Figure 1-3.

Style Number Example

As an example, if the style number of a BE1-87G were G1EA1JA0C0F, the relay would have the following characteristics and features:

G three-phase current sensing 1 switch-selectable sensing input range for 0.1, 0.15, 0.2, 0.4, 0.5, 0.8, or 1.6 Aac E one normally-open output relay A1 instantaneous timing J relay operating power derived from 125 Vdc or 100/120 Vac A internally operated targets (one per phase) 0 option 1 not available C push-to-energize outputs (pushbuttons) 0 no auxiliary output contacts F semi-flush mounting case

9170800990 Rev N BE1-87G General Information 1-3

Figure 1-3. Style Number Identification Chart

SPECIFICATIONS

BE1-87G relays have the following features and capabilities.

Current Sensing Inputs

Sensing Input Range 1

Nominal Rating: 5 Aac Maximum Continuous Rating: 10 Aac 1 Second Rating: 250 Aac Frequency Range: 45 to 65 Hz Burden: <0.05 Ω per input

Sensing Input Range 2

Nominal Rating: 1 Aac Maximum Continuous Rating: 2 Aac 1 Second Rating: 50 Aac Frequency Range: 45 to 65 Hz Burden: <0.25 Ω per input

Stabilizer Reactor

Refer to Section 3, Functional Description for stabilizer reactor impedance characteristic curves.

I2t Rating (I2t = 4225)

Sensing Input Range 1: 65 A for 1 s at 70°C ambient Sensing Input Range 2: 13 A for 1 s at 70°C ambient

1-4 BE1-87G General Information 9170800990 Rev N

Pickup

Type

Input Voltage

Burden at Nominal

Nominal

Range

K (midrange)

48 Vdc

24 to 150 Vdc

2.75 W

J (midrange)

125 Vdc 120 Vac

24 to 150 Vdc 90 to 132 Vac

2.96 W

7.87 VA

L (low range)

24 Vdc

∗ 12 to 32 Vdc

2.85 W

Y (mid range)

48 Vdc

125 Vdc

24 to 150 Vdc 24 to 150 Vdc

2.75 W

2.96 W

Z (high range)

250 Vdc 230 Vac

68 to 280 Vdc 90 to 270 Vac

3.13 W

9.20 VA

Graphs of the actual operating characteristics are shown in Section 5, Testing and Setting.

Control

A front panel sensitivity switch permits selection of minimum differential (operate) current. This sensitivity is constant for restraint currents less than the nominal current (5 Aac for sensing input range 1 or 1 Aac for sensing input range 2).

Minimum Differential (Operate) Current

Sensing Input Range 1: 0.1, 0.15, 0.2, 0.4, 0.5, 0.8, or 1.6 A Sensing Input Range 2: 0.02, 0.03, 0.04, 0.08, 0.10, 0.16, or 0.32 A

The ideal operating characteristic is approximated by the following equations∗:

Sensing Input Range 1: For I For I Sensing Input Range 2: For I For I

is the restraint current, defined as the lesser of the input currents

∗ I

is the operate current

is the front panel setting

≤ 5 A: IOP = IS

> 5 A: IOP = IS + 0.5 (IR − 5)

≤ 1 A: IOP = IS

> 1 A: IOP = IS + 0.5 (IR − 1)

Accuracy

Sensing Input Range 1

For I

≤ 4 A: ±5% of the operate pickup characteristic or ±25 mA, whichever is

greater

For I

> 6 A (20 A max.): ±8% of the operate pickup characteristic or ±150 mA, whichever is

greater

Sensing Input Range 2

For I

≤ 0.8 A: ±5% of the operate pickup characteristic or ±25 mA, whichever is

greater

For I

> 1.2 A (4 A max.): ±8% of the operate pickup characteristic or ±150 mA, whichever is

greater

Dropout

>90% of operate characteristic

Timing

<30 ms at 10 times pickup setting, 70 ms maximum

Operating Power Input

Relay operating power may be obtained from a wide variety of external voltage sources. When ordering, any one of five internal power supply types may be selected to match the operating power voltage level available at your site. Available power supply types are listed in Table 1-1.

Table 1-1. Power Supply Types

9170800990 Rev N BE1-87G General Information 1-5

∗ The type L power supply initially requires 14 Vdc to begin operating. Once operating, the

voltage may be reduced to 12 Vdc and operation will continue.

Output Contacts

Resistive Ratings

120 Vac: Make, break, and carry 7 Aac continuously 250 Vdc: Make and carry 30 Adc for 0.2 s, carry 7 Adc continuously,

break 0.3 Adc

500 Vdc: Make and carry 15 Adc for 0.2 s, carry 7 Adc continuously,

break 0.3 Adc

Inductive Ratings

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

Targets

Electronically latched, manually reset target indicators may be optionally selected as either internally operated or current operated.

Current operated targets require a minimum trip circuit current of 200 milliamperes and have a continuous rating of 3 amperes, a two-minute rating of 7 amperes, and a one-second rating of 30 amperes.

Internally operated targets should be selected if the relay has normally-closed output contacts.

Type Tests

Dielectric Strength

In accordance with ANSI/IEEE C37.90, passes one-minute dielectric tests as follows:

All Circuits to Ground: 2,121 Vdc Input Circuits to Output Circuits: 1,500 Vac or 2,121 Vdc

Surge Withstand Capability

Qualified to ANSI/IEEE C37.90.1-1989

Fast Transient Immunity

Qualified to ANSI/IEEE C37.90.1-1989

Impulse Testing

Qualified to IEC 255-5

Radio Frequency Interference

Maintains proper operation when tested for interference in accordance with IEEE C37.90.2

Shock

Withstands 15 G in each of three mutually perpendicular planes.

Vibration

Withstands 2 G in each of three mutually perpendicular planes, swept over the range of 10 to 500 Hz for a total of six sweeps, 15 minutes each sweep.

Physical

Temperature

Operating: –40 to 70°C (–40 to 158°F) Storage: –65 to 100°C (–85 to 212°F)

Weight

Single-Phase Sensing Units: 14.3 lb (6.5 kg) maximum Three-Phase Sensing Units: 19.2 lb (8.7 kg) maximum

Case Size

All units are supplied in an S1 case size. See Section 4, Installation for case dimensions.

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Agency Recognition

UL Recognition: UL recognized per Standard 508, File E97033

NOTE: Output contacts are not UL recognized for voltages greater than 250 volts.

GOST-R Certification

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

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SECTION 2 • CONTROLS AND INDICATORS

TABLE OF CONTENTS

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

GENERAL .............................................................................................................................................. 2-1

Figures

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

Tables

Table 2-1. Control and Indicator Descriptions ........................................................................................... 2-1

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ii BE1-87G Controls and Indicators 9170800990 Rev N

SECTION 2 • CONTROLS AND INDICATORS

Locator

Description

Sensitivity Switch. This thumbwheel switch has seven positions labeled A through G and sets the desired level of operating current that will cause the relay to trip.

Switch Position Chart. This chart relates the switch position to the operating current

range 2).

Power Indicator. This LED lights when operating power is applied to the relay.

Target Indicators. Electronically-latching red target LEDs light when a trip condition

a target LED is provided for each phase protected.

Target Reset Switch. Operating this switch resets all of the target indicators (locator D).

Output Test Switch. This momentary-action pushbutton switch operates the output and

through the access hole in the front panel.

GENERAL

BE1-87G controls and indicators are illustrated in Figure 2-1 and described in Table 2-1.

Figure 2-1. Controls and Indicators

Table 2-1. Control and Indicator Descriptions

required for tripping when the restraint current is less than or equal to the nominal value of sensing current (5 Aac for sensing input range 1 or 1 Aac for sensing input

exists on the corresponding phase of current. When the optional targets are specified,

auxiliary relays. The switch is accessed by inserting a ⅛” diameter, non-conducting rod

9170800990 Rev N BE1-87G Controls and Indicators 2-1

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