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Function of protective relaying

The function of protective relaying is to cause the prompt removal from service of any element of a power system when it suffers a short circuit, or when it starts to operate in any abnormal manner that might cause damage or otherwise interfere with the effective operation of the rest of the system.

The Art And Science Of Protective Relaying
The Art And Science Of Protective Relaying (photo credit: precise.co.th)

The relaying equipment is aided in this task by circuit breakers that are capable of disconnecting the faulty element when they are called upon to do so by the relaying equipment.

Circuit breakers are generally located so that each generator, transformer, bus, transmission line, etc., can be completely disconnected from the rest of the system.

These circuit breakers must have sufficient capacity so that they can carry momentarily the maximum short-circuit current that can flow through them, and then interrupt this current; they must also withstand closing in on such a short circuit and then interrupting it according to certain prescribed standards.

Fusing is employed where protective relays and circuit breakers are not economically justifiable!

Although the principal function of protective relaying is to mitigate the effects of short circuits, other abnormal operating conditions arise that also require the services of protective relaying. This is particularly true of generators and motors.

A secondary function of protective relaying is to provide indication of the location and type of failure.

Such data not only assist in expediting repair but also, by comparison with human observation and automatic oscillograph records, they provide means for analyzing the effectiveness of the fault-prevention and mitigation features including the protective relaying itself.

Title:The Art And Science Of Protective Relaying by General Electric
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Size:2.9MB
Pages:357
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The Art And Science Of Protective Relaying
The Art And Science Of Protective Relaying

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3 Comments


  1. Paul Audu
    Dec 22, 2018

    Thank you for the invaluable treasure. As a young protection engineer in the 1980s from a third-world country, the best I could lay my hand on of this valuable piece was just a photocopy which I had treasured till date. How I wish this generation will capitalise on the advantage of quality information available on the internet instead of dwelling on vanities!

    PAUL


  2. Kongkawee Plapol
    Oct 25, 2016

    This picture is PRECISE BRAND?
    Thank you for know how. :)


  3. MARIO
    Jan 09, 2012

    PLEASE I NEED FREE ILEARNING ELECTRICITY

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