Adjustable undervoltage trip fault interrupt circuit

Details Adjustable undervoltage trip fault interrupt circuit Adjustable undervoltage trip fault interrupt circuit

1995-05-05

1997-01-21

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 33, 361 56, H02H 324, H02H 709

Patent

active

055964710

ABSTRACT:
An adjustable undervoltage trip fault interrupt circuit is used to prevent "nuisance" undervoltage fault trips caused by instantaneous sags in the AC power lines of less than a selectable time. The interrupt circuit includes a time delay circuit (IC4) responsive to a detected signal for generating a pulse signal having a selectable duration. A gating circuit (IC3) is responsive to the detected signal and the pulse signal for generating a fault trip signal only when the detected signal is longer than the selected duration of the pulse signal. In this manner, instantaneous line sags shorter than the selected duration of the pulse signal are eliminated from causing the "nuisance" interruption of a variable frequency drive controller.

REFERENCES:
patent: 3784846 (1974-01-01), Krick et al.
patent: 3940663 (1976-02-01), Meier et al.
patent: 4031463 (1977-06-01), Norberg

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