ABB TRB-2 Instruction Leaflet

Brand: ABB

Model: TRB-2

Type: Instruction Leaflet

This manual is also suitable for

TRB Series

ABB TRB-2 The ABB TRB-2 is a Zener tripping unit that is used to trip circuit breakers in a double trip relaying scheme. It is suitable for cases where the total trip current of the two breakers is within the relay contact rating, usually 30 amperes.

The TRB-2 consists of two diode circuits that are completely independent from each other. Each circuit has one diode, and the TRB-2 is rated for 125Vdc and 30 Amps.

The TRB-2 can be used to isolate multiple trip paths to one breaker, or to trip two breakers without additional time delay by the operation of a common relay.

The TRB-2 consists of two diode circuits that are completely independent from each other. Each circuit has one diode, and the TRB-2 is rated for 125Vdc and 30 Amps.

The TRB-2 can be used to isolate multiple trip paths to one breaker, or to trip two breakers without additional time delay by the operation of a common relay.

Before putting relays into service, remove all blocking

which may have been inserted for the purpose of secur-

ing the parts during shipment, make sure that all mov-

ing parts operate freely, inspect the contacts to see that

they are clean and close properly, and operate the relay

to check the settings and electrical connections.

1. APPLICATION

The TRB Zener tripping unit is an auxiliary device energized

by protective relays to trip circuit breakers in a double trip

relaying scheme. It is suitable for cases where the total trip

current of the two breakers is within the relay contact rating,

usually 30 amperes. The TRB-2 unit can also be used for

isolation of multiple trip paths to one breaker.

2. CONSTRUCTION AND OPERATION

TRB Zener tripping units consists of 50-watt Zener diodes

on brass plates contained within a short metal cage and

mounted on a small molded base. The TRB-2 unit contains

two diode circuits which are completely independent from

each other. These circuits may have only one diode each

or, in the case of 250 Vdc ratings, may each have two di-

odes in series.

CAUTION

TRB-3 units contain three diodes, two of which have a

common anode terminal and separate cathode terminals.

The third diode is completely independent from the other

two.

TRB-4 units contain four diodes in two completely inde-

pendent circuits. Each circuit has two diodes which have

a common anode terminal and separate cathode termi-

nals.

The TRB Zener tripping unit is energized through the con-

tacts of protective relays as shown in Figure 1. Relay con-

tacts PR trips two breakers through diodes D1 and D2.

However, relay contacts #1 and #2 can energize only

their own related breakers #1 and #2 respectively be-

cause current flow to the adjacent breaker trip coil is

blocked by diodes D1 and D2. Thus relays associated

with each particular breaker are isolated from the other

breaker, yet both breakers can be tripped, without addi-

tional time delay, by the operation of a common relay.

Transient voltages induced into the diode circuits in ex-

cess of their reverse blocking rating can be tolerated with-

out damage to the diodes. This feature results from the

zener characteristic which allows current to flow in the re-

verse direction and limits the voltage across the diode.

41-842D

ABB Power T&D Company Inc.

Power Automation and Protection Division

Coral Springs, FL 33065

Type TRB

Zener Tripping Unit

Instruction Leaflet

Effective: January 1997

Supersedes 41-842C Dated May 1992

All possible contingencies which may arise during installation, operation or maintenance, and all details and

variations of this equipment do not purport to be covered by these instructions. If further information is desired

by purchaser regarding this particular installation, operation or maintenance of this equipment, the local ABB

Power T&D Company Inc. representative should be contacted.

( | ) Denotes Change Since Previous Issue

Maximum Maximum Zener

One Forward Reverse Reverse Maximum

Sec. Volts Leakage Voltage Zener

Type Rating Diode Rating Drop Micro Amps In Volts Current

at 152 Volts

TRB-2 125Vdc 1N2846 30 Amps 1.5 4

µA 200 ± 10% 75 mA

TRB-2 250Vdc 1N2846 30 Amps 3.0 4

µA 400 ± 10% 75 mA

TRB-3 125Vdc 1N2846 30 Amps 1.5 4

µA 200 ± 10% 75 mA

TRB-4 125Vdc 1N2846 30 Amps 1.5 4

µA 200 ± 10% 75 mA

Characteristics and Ratings

Printed in Coral Springs, FL

I.L. 41-842D

Figure 1. Optional Schematic Figure 2. Internal Schematic of Type TRB-2

Zener Tripping Unit

Figure 4. Internal Schematic of Type TRB-4

Zener Tripping Unit

Figure 3. Internal Schematic of Type TRB-3

Zener Tripping Unit

187A713

187A696

187A697

187A698

Sub 1

dc Trip Bus

Pos.

Neg.

Relay #1 Relay #2

52d1 52d2

TRB-2

D2D1

143

I.L. 41-842D

Figure 5. Outline and Drilling Plan for Types TRB, TRB-1, TRB-2, TRB-3 and TRB-4 Zener Tripping Units

184A117

Sub 6

TERMINAL SCREWS .190-32

BINDING HEAD

CLEARANCE FOR .190-32

FIL.HD.MTG. SCREW

AVAILABLE

OPENING

AN ADDITIONAL 7/8

INCH OF SPACE IS

REQUIRED IF CASE

ASSEMBLY IS TO BE

REMOVABLE FOR FIG. 2

& 3 INCHES FOR FIG. 1, 3 & 4

FIG DESCRIPTION DIM. A

TRB STATIC TRIPPING UNIT

TRB-1 BLOCKING VALVE

4-27 / 32

2 TRB-1 TEST UNIT 2-1 / 32

3 TRB ZENER TRIPPING UNITS 4-27 / 32

4 SAR AUX RELAY 4-27 / 32

5 SRX RELAY 5.781

ABB TRB-2 Instruction Leaflet

Brand: ABB

Model: TRB-2

Type: Instruction Leaflet

This manual is also suitable for

TRB Series

The TRB-2 consists of two diode circuits that are completely independent from each other. Each circuit has one diode, and the TRB-2 is rated for 125Vdc and 30 Amps.

The TRB-2 can be used to isolate multiple trip paths to one breaker, or to trip two breakers without additional time delay by the operation of a common relay.

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ABB TRB-2 Instruction Leaflet

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