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Study Of Relay Behaviour Under System Oscillations And Out Of Step Conditions, Emil D. Grigoriadis

Masters Theses

"The recent developments in harnessing electrical power have opened a new field in the improvement and betterment of the existing types of relays and the development of new types. Thus about 1930 the manufacturers introduced the high speed circuit breaker with operating times of the order of 8 cycles and the engineers awoke to the possibilities of high speed or one-cycle relays.

Many developments took place since that time which gave us the improved forms of Instantaneous Overcurrent Protective schemes, the Distance Relay Protection, the Carrier Current Protection and many others. Later, because of the war time problems of increased …