Protective relay for power systems capable of being tested with

Details Protective relay for power systems capable of being tested with Protective relay for power systems capable of being tested with

1995-04-14

1995-12-26

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 65, 361 79, 324418, 324527, H02H 300

Patent

active

054793157

ABSTRACT:
The relay includes an input module capable of receiving 70 volt and 5 amp signals, respectively, from conventional instrument transformers, which are responsive to power line signals at their primaries. Output signals from the input module have specified, standardized levels suitable for electronic processing circuits, i.e. 1.4 volts and 0.1 volt. The output signals from the input module are applied through an accessible connector to a separate processing module which uses those signals in a conventional manner to determine possible faults on the power line. Low-level testing is accomplished by testing the outputs of the input module and by applying test signals simulating the standardized outputs of the input module to the processing module.

REFERENCES:
patent: 4741711 (1988-05-01), Singer, Jr.
patent: 4858056 (1989-08-01), Russell
patent: 5270658 (1993-12-01), Epstein
patent: 5378479 (1995-01-01), Lombardi

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