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INTRODUCTION

This manual provides information concerning the operation and installation of the BE1-87GVariable Percentage Differential Relay. To accomplish this, the following is provided.

Specifications

Functional description

Mounting information

Setting procedure/example.

W A R N I N G !

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

 

 

 

 

 

 

BE1-87G- Introduction

i

First Printing: December 1985

Printed in USA

© 1995, 1996, 1999, Basler Electric Co., Highland, IL 62249

May 1999

CONFIDENTIAL INFORMATION

OF BASLER ELECTRIC COMPANY, 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 COMPANY.

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 Company, Highland, Illinois.

 

BASLER ELECTRIC

 

ROUTE 143, BOX 269

 

HIGHLAND, IL 62249 USA

 

http://www.basler.com, infor@basler.com

PHONE 618-654-2341

FAX 618-654-2351

 

 

ii

BE1-87G- Introduction

CONTENTS

SECTION 1

GENERAL INFORMATION

1-1

 

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

 

Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

 

Variable Restraint Characteristic . . . . . . . . . . . . . . . . . . . . . . . . . .

1-3

 

Design Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-3

 

Model and Style Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-3

 

Style Number Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-3

 

Style Number Identification Chart . . . . . . . . . . . . . . . . . . . . . . . . .

1-4

 

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-5

SECTION 2 CONTROLS AND INDICATORS

2-1

SECTION 3

FUNCTIONAL DESCRIPTION

3-1

 

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

 

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

 

Current Transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

 

Stabilizing Reactor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2

 

Bandpass Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3

 

Comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3

 

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3

 

Targets (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3

 

Push-To-Energize(Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3

 

Power Supply Status Output (Optional) . . . . . . . . . . . . . . . . . . . . .

3-3

 

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-4

SECTION 4

INSTALLATION

4-1

 

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

 

Dielectric Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

 

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

 

Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

 

S1 Case, Outline Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

 

S1 Case, Double-Ended,Outline Dimensions . . . . . . . . . . . . . . . .

4-2

 

S1 Case, Panel Drilling Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .

4-3

 

Stabilizing Reactor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-4

 

S1 Case And Reactor, Outline Dimensions . . . . . . . . . . . . . . . . . .

4-5

 

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-5

 

Typical DC Control Connections . . . . . . . . . . . . . . . . . . . . . . . . . .

4-6

 

Single-PhaseSensing Input Connections . . . . . . . . . . . . . . . . . . .

4-6

 

Three-PhaseSensing Input Connection . . . . . . . . . . . . . . . . . . . .

4-7

 

Single Phase Internal Connection Diagram . . . . . . . . . . . . . . . . . .

4-8

 

Three Phase Internal Connection Diagram . . . . . . . . . . . . . . . . . .

4-9

SECTION 5 TESTING AND SETTING

5-1

 

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

 

Relay Operating Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

 

Dielectric Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

 

Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

 

Operational Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2

 

Operational Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2

 

Location Of Assemblies (Single-PhaseOnly) . . . . . . . . . . . . . . . .

5-3

 

TP-1AndTP-2OnSingle-PhaseRelays . . . . . . . . . . . . . . . . . . . .

5-3

 

Single-PhaseTrip And Dropout Test . . . . . . . . . . . . . . . . . . . . . . .

5-4

BE1-87G- Introduction

iii

CONTENTS - Continued

SECTION 5 TESTING AND SETTING - Continued

Sensing Input Range 1, Operating Characteristics . . . . . . . . . . . .

5-5

Sensing Input Range 2, Operating Characteristics . . . . . . . . . . . .

5-6

Extended Restraint Operating Characteristic . . . . . . . . . . . . . . . . . . .

5-7

Pickup Response Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-7

Phases B And C, Trip And Dropout Test . . . . . . . . . . . . . . . . . . .

5-8

Target Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-8

Auxiliary Output Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-8

Push To Energize Output Test . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-8

Power Supply Status Output Test . . . . . . . . . . . . . . . . . . . . . . . . .

5-8

Setting The Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-8

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-8

Setting Example Number One . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-10

Setting Example Number Two . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-11

SECTION 6 MAINTENANCE

6-1

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

In-HouseRepair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

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

SECTION 7 MANUAL CHANGE INFORMATION

7-1

iv

BE1-87G- Introduction

SECTION 1 • GENERAL INFORMATION

DESCRIPTION

BE1-87GVariable Percentage Differential relays are singleorthree-phasesolid 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 into the protected zone equals the current out 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.

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

APPLICATION

BE1-87GVariable Percentage Differential relays are recommended for the following specific applications when used with current transformers (CT) with an accuracy class of either C20 or better or T20 or better.

Generators: any terminal voltage and a rating of 1000 kVA and above.

Generators: any kVA rating and a terminal voltage of 5 kV and above.

Generators: a terminal voltage of 2200 V or higher, and a rating of more than 500 kVA.

Motors: rated 1500 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 applies to three phase relays terminals 7 and 8, terminals 13 and 14, and terminals 17 and 18. ExerciseCAUTION when grounding or testing current transformer circuits connected to these terminals.

Typical application schemes are shown in Figures 1-1and1-2.

BE1-87G- General Information

1-1

Figure 1-1.TypicalSingle-PhaseApplication Scheme

Figure 1-2.TypicalThree-PhaseApplication Scheme

1-2

BE1-87G- General Information

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 BE1-87Gprovides a restraint factor that is proportional to input current when the restraining current (IR) is greater than nominal (five amperes for sensing input type one or one ampere for sensing input type two). TheBE1-87Gcompares 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 theBE1-87Gmore 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 (five amperes for sensing input type one or one ampere for sensing input type two) or less, the relay trips if the differential current exceeds the relay setting (I S). 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 solid-stateBE1-87GVariable Percentage Differential Relay are summarized as follows.

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 BE1-87Gfor 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.

Singleor three-phaseavailability. Either configuration is available in the Basler Electric S1 drawout case.

High-SpeedOperation. TheBE1-87Goperates in 30 milliseconds for fault levels of 10 times the sensitivity setting. Thishigh-speedoperation minimizes potential damage to the protected equipment. Response characteristics for sensing input ranges 1 and 2 are shown in Section 5,

Testing And Setting the relay.

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 describe the features and options in a particular device and appear on the front panel, drawout cradle, and inside the case assembly. The model number BE1-87Gdesignates the relay as a Basler Electric Class 100, Variable Percentage Differential Relay.

Style Number Example

Figure 1-3illustrates the style number identification chart with features and options forBE1-87Grelays. For example, if the style number wereBE1-87GGlE AlJ AOCOF the device would have the following:

BE1-87G- General Information

1-3

BE1-87G Model Number

G Three-phasesensing input

1 Sensing range switch selectable for 0.1, 0.15, 0.2, 0.4, 0.5, 0.8, or 1.6 A

ENormally open output relay A1 Instantaneous timing

JOperating power derived from 125 Vdc or 100/120 Vac

AInternally operated targets (one per phase) 0 No option 1 available

CPush-to-energizeoutputs (pushbuttons)0 No auxiliary output contacts

FSemi-flushmounting

Style Number Identification Chart

Figure 1-3is the Style Number identification Chart for theBE1-87GVariable Percentage Differential relay.

Figure 1-3.Style Number Identification Chart

1-4

BE1-87G- General Information

SPECIFICATIONS

BE1-87Grelays are available insingle-phaseandthree-phaseconfigurations, and with the following features and capabilities.

Current Sensing Inputs

 

 

(5 Ampere)

Nominally rated at 5 amperes, with a range of 45 to 65 hertz. Maximum

 

current per input: 10 amperes continuous, 250 amperes for 1 second.

(1 Ampere)

Nominally rated at 1 ampere, with a range of 45 to 65 hertz. Maximum

 

current per input: 2 amperes continuous, 50 amperes for 1 second.

Current Sensing Burden

 

 

(5 Ampere)

Burden is less than 0.05 ohms per input.

(1 Ampere)

Burden is less than 0.25 ohms per input.

Stabilizing Reactor

Refer to Section 4 for stabilizing reactor impedance characteristic curves.

I 2 t Rating

 

 

(5 Ampere)

65 amperes for 1 second at 70( C ambient, (I 2 t = 4225).

(1 Ampere)

13 amperes for 1 second at 70( C ambient, (I 2 t = 4225).

Pickup Control

A front panel control permits minimum differential (operate) currents to be

 

selected. This sensitivity is constant for restraint currents less than the

 

nominal current (5 or 1 amperes). Actual operating characteristics are

 

shown in graph format in Section 5, Testing And Setting the relay.

(5 Ampere)

Minimum differential (operate) current = 0.1, 0.15, 0.2, 0.4, 0.5, 0.8, or 1.6

 

amperes. The ideal operating characteristic is approximated by the

 

following equations.

 

where

 

 

I R is the restraint current, defined as the lesser of the input currents.

 

I OP is the operate current

 

I S is the front panel setting

 

For I R 5 amperes: IOP = IS

 

For I R

> 5 amperes: I OP = IS + 0.5(IR - 5)

(1 Ampere)

Minimum differential (operate) current = 0.02, 0.03, 0.04, 0.08, 0.10, 0.16,

 

or 0.32 ampere. The ideal operating characteristic is approximated by the

 

following equations.

 

For I R 1 ampere: IOP = IS

 

For I R

> 1 ampere: I OP = IS + 0.5(IR - 1)

Pickup Accuracy

 

 

(5 Ampere)

For I R 5 amperes, ±5% of the operate pickup characteristic or 25

 

milliamperes whichever is greater. Actual operating characteristics are

 

shown in graph format in Section 5, Testing And Setting the relay.

 

For I R 5 amperes, up to a maximum of 20 amperes, ±8% of the operate

 

pickup characteristic or 150 milliamperes, whichever is greater. Actual

 

operating characteristics for pickup values between 5 and 20 amperes are

 

shown in graph format in Section 5, Testing And Setting the relay.

 

 

BE1-87G- General Information

1-5