Timing circuit for an overcurrent relay

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

1979-12-17

1982-02-09

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 94, 361 97, 307603, H02H 3093

Patent

active

043152953

ABSTRACT:
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 circuits 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.

REFERENCES:
patent: 3319127 (1967-05-01), Zocholl et al.
patent: 3327171 (1967-06-01), Lipnitz et al.
patent: 3413496 (1968-11-01), Baude
patent: 3573555 (1971-04-01), Lipnitz
patent: 4149210 (1979-04-01), Wilson

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