Solid-state trip device with test circuit for an electrical circ

Details Solid-state trip device with test circuit for an electrical circ Solid-state trip device with test circuit for an electrical circ

1986-12-23

1988-08-02

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 47, 361 42, 361 63, 361 93, 324509, H02H 308

Patent

active

047617047

ABSTRACT:
A test circuit simulates the operation of a multipole electrical circuit breaker, and includes a pair of auxiliary terminals connected by a connection circuit to the input terminals of a bridge rectifier cell whose output is connected in parallel with the respective outputs to two other rectifier cells associated with current transformers. A first resistor delivers a first signal proportional to the maximum intensity of the mains currents. Diodes cooperate with a second measuring resistor of a residual earth leakage current discriminator. Reversing the direction of the test current flow in the test circuit is performed by simply changing the polarity of the test terminals, and enables overcurrent protection and earth leakage protection of the electronic trip device to be checked separately.

REFERENCES:
patent: Re31147 (1983-02-01), Helwig, Jr. et al.
patent: 3924160 (1975-12-01), Maier et al.
patent: 4060844 (1977-11-01), Davis et al.
patent: 4209818 (1980-06-01), Zylstra et al.
patent: 4258403 (1981-03-01), Shimp
patent: 4347540 (1982-08-01), Gary et al.
patent: 4649455 (1987-03-01), Scott

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