Ground fault protective systems with variable rate integration o

Details Ground fault protective systems with variable rate integration o Ground fault protective systems with variable rate integration o

1974-12-05

1977-05-17

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

328143, H02H 328

Patent

active

040244350

ABSTRACT:
To minimize nuisance tripping for spurious causes in ground fault protective systems, fault-characterizing signals derived from differential currents in alternating current supply lines are subjected to a variable integration automatically adapted to the magnitude of the fault-characterizing signal. Higher level signals are integrated at augmented rates, preferably with an antilog characteristic. The supply circuit is interrupted when the expanded and integrated signal exceeds a threshold value.

REFERENCES:
patent: 3339114 (1967-08-01), Kelley et al.
patent: 3551694 (1970-12-01), Boxall
patent: 3723814 (1973-03-01), Gross
patent: 3733517 (1973-05-01), Wilson
patent: 3899717 (1975-08-01), Legatti et al.

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