Overvoltage protective relay device

Details Overvoltage protective relay device Overvoltage protective relay device

1983-07-22

1986-05-20

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 35, 361 86, 361 89, 340662, H02H 704, H02H 320

Patent

active

045905339

ABSTRACT:
A device for protecting from an overvoltage a power apparatus constituting an electric power system. The device comprises a plurality of detector means having respectively different voltage detection regions so as to attain preferably protection characteristic corresponding to the characteristic curve of the voltage-and-time product permissible for the power apparatus, a plurality of timer means for checking whether the durations of the outputs of the detector means exceed a respective predetermined time periods, and logic means for combining the respective outputs of the timer means through a predetermined logic operation.

REFERENCES:
patent: 3531689 (1970-09-01), Horn
patent: 4250532 (1981-02-01), Davis
patent: 4326230 (1982-04-01), Becker et al.

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