Classification of Relays
The relays used in the power system operate by virtue of the current or voltage supplied by the current and voltage transformers connected in various combinations to the system element that is to be protected. Through the individual or relative changes in these two quantities, faults signal their presence, type and location to the protective relays can be found. Having detected the fault the relay operates the trip circuit which results in the opening of the circuit breaker and hence in
the disconnection of the healthy circuit.
Most of the relays are of electro-mechanical type. They work on the following two main operating principles:
(i) Electromagnetic attraction (ii) Electromagnetic induction
Written by John on October 30th, 2008 with
2 comments.
Read more articles on classification of relays and Power System and Relays and Switchgear&Protection.
Chandan Dutta
#1. April 16th, 2009, at 8:27 AM.
How to applicate balance beam relay at distance protection..how was it work??..can give me some ideas how to develope prototype of balance beam in creative way to show how the relay work..