Short-circuit protective systems

Details Short-circuit protective systems Short-circuit protective systems

1974-09-16

1976-05-04

Miller, J. D.

317 27R, H02H 328

Patent

active

039551210

ABSTRACT:
My invention relates to short-circuit protective systems for polyphase dynamo electric machine, which systems are very sensitive and respond to ground short-circuits as well as to phase-to-phase short circuits. The invention comprises two or three small current transformers connected to a single instantaneous relay which is applied to trip the machine contactor or breaker when any ground short-circuit or phase-to-phase short-circuit occurs.

REFERENCES:
patent: 2885568 (1959-05-01), Reeder et al.
patent: 3107318 (1963-10-01), Lytle
patent: 3675080 (1972-07-01), Bath
patent: 3851216 (1974-11-01), Clarke et al.

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