Self-contained ground fault test feature in circuit breaker

Details Self-contained ground fault test feature in circuit breaker Self-contained ground fault test feature in circuit breaker

1985-04-05

1987-12-22

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

H02H 316

Patent

active

047149752

ABSTRACT:
A self-contained test feature for ground fault protection systems in circuit breakers. The ground fault protection system includes a sensing transformer having a primary winding that sums the currents through the phase current transformers. Upon the occurrence of an actual ground fault, the sensing transformer will transmit a signal to cause the breaker to trip. The test feature includes a test transformer having its secondary winding electrically connected in parallel with the primary winding of the sensing transformer. The current path between the test transformer secondary winding and sensing transformer primary winding is completed only upon the activation of a test switch. The primary winding of the test transformer is hooked to an external current source to provide the necessary current to simulate the ground fault.

REFERENCES:
patent: Re31147 (1983-02-01), Helwig, Jr. et al.
patent: 4258403 (1981-03-01), Shimp
patent: 4316229 (1982-02-01), Helwig, Jr.
patent: 4378579 (1983-03-01), Hudson, Jr.

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