Solid-state trip unit for DC circuit breakers

Details Solid-state trip unit for DC circuit breakers Solid-state trip unit for DC circuit breakers

1989-07-03

1990-09-11

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 97, H02H 308

Patent

active

049567411

ABSTRACT:
A contactor includes two DC sensors within the housing which are isolated from the tripping unit, from the power supply and from each other by the combination of a transformer and photoelectric coupling, the sensed signals being pulse width modulated and demodulated on the respective sides of the photoelectric coupling barrier.

REFERENCES:
patent: 4266259 (1981-05-01), Howell
patent: 4351012 (1982-09-01), Elms et al.
patent: 4423458 (1983-12-01), Stich
patent: 4492941 (1985-01-01), Nagel
patent: 4743875 (1988-05-01), Murphy
patent: 4788620 (1988-11-01), Scott

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