Timing circuit for an overcurrent relay

Details Timing circuit for an overcurrent relay Timing circuit for an overcurrent relay

H - Electricity

02

H

348/36

H02H 3/093 (2006.01) H02H 3/027 (2006.01)

Patent

CA 1137613

C-1951(SWGR/SPO) TIMING CIRCUIT FOR AN OVERCURRENT RELAY ABSTRACT OF THE DISCLOSURE A timing circuit for use in an overcurrent relay is disclosed. A plurality of non-interacting R-C circuits whose outputs are summed is provided. The signal representing the summed outputs of the R-C cir- cuits represents one term of the inverse time-current; relation it is desired to emulate. Each time the summed signal reaches a predetermined level, a pulse is generated. The frequency of the pulses determines the length of a time delay before the protected circuit is interrupted. When it is necessary to take the second term of the time- current relation into account, this can be done by providing a multivibrator that emits pulses of an adjustable duration responsive to the summed signal and that itself triggers the generation of the pulse train constituting the timing circuit output.

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