Self-monitoring fault current safety switch

Details Self-monitoring fault current safety switch Self-monitoring fault current safety switch

1986-10-20

1988-05-03

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 91, 361110, H02H 308

Patent

active

047424222

ABSTRACT:
A fault current circuit breaker for monitoring electrical circuits having a total current converter with a primary circuit including supply and return leads which are to be monitored and a secondary winding acting upon an electronic limiting value circuit which controls an electromagnetic retaining device. Switch contacts are provided for switching the circuit to be monitored when a predetermined fault current is exceeded. In order to enable self-monitoring, a current is briefly and periodically fed into an additional winding of the total current converter, with the current simulating a fault current, and a pulse voltage which appears at the output of the electronic limit value circuit due to the current in the additional winding is fed to an evaluation circuit, which causes the switch contacts to open in the absence of periodic pulses coming through the electromagnetic retaining device.

REFERENCES:
patent: 3786356 (1974-01-01), MacPhee
patent: 3973317 (1976-08-01), Howell
patent: 4598331 (1981-07-01), Legatti

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