ABB TD-5 Foglio di istruzioni

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Effective: January 1, 2012

Supersedes I.L. 41-579.11, Dated May 2004

( ) Denotes Text Change Since Previous Issue

( * ) Denotes Figure Change Since Previous Issue

Before putting relays into service, remove all

blocking inserted for the purpose of securing the

parts during shipment. Make sure that all moving

parts operate freely. Inspect the contacts to see

that they are clean and can close properly. Close

the red handle switch last when placing the relay

in service. Open the red handle first when

removing relay from service.

CONTENTS

This instruction leaflet applies to Class 1E TD-5 Time

Delay Relays which can be described as follows:

TD-5 Time Delay Relays with Smart Style Number

Ex: TD51ET1V1PNN

1.0 APPLICATION

This relay has been specially designed and tested to

establish its suitability for Class 1E applications in

accordance with the ABB Relay Division program for

Class 1E Qualification Testing as detailed in the ABB

publication STR-1.

"Class 1E" is the safety classification of the electric

equipment and systems in nuclear power generating

stations that are essential to emergency shutdown of

the reactor, containment isolation, cooling of the reactor,

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

representative should be contacted.

Printed in U.S.A.

Time Delay Relay

(for Class 1E application)

and heat removal from the containment and reactor, or

otherwise are essential in preventing significant release

of radioactive material to the environment.

The type TD-5 relay is used in timing applications where

accuracy, repeatability and fast reset are required. Its

principal use is in time delayed distance relaying and in

breaker failure timing applications.

TD-5 is a dc relay capable of direct application to station

batteries. It covers 0.05 to 30 seconds in 4 different

ranges.

2.0 CONSTRUCTION AND OPERATION

The type TD-5 relay consists of a reference voltage circuit,

a rheostat (T) and scale plate, a voltage biasing

potentiometer or adjustable resistor (P), a printed circuit

board containing static timing components; an output

relay (TR), and an indicating contactor switch (ICS). An

auxiliary relay (TX) is supplied on some TD-5 relays to

override bounce of the initiating contact.

TR and TX are printed circuit board mounted miniature

power relays.

Instruction Leaflet

41-579.11B

Type TD-5