Selective protection process for electrical lines and device for

Details Selective protection process for electrical lines and device for Selective protection process for electrical lines and device for

1978-10-23

1980-12-02

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 82, 361 84, 361 85, 324 51, H02H 726

Patent

active

042375118

ABSTRACT:
A distance-selective short-circuit monitoring device with a low response time (FIG. 3, FIG. 5) results from sequence detection of first and second monitoring signals (US.sub.1, US.sub.2) which are selectively allotted to the zero cross-overs of detection signals (Ud.sub.1 -Ud.sub.4) which determine a polygonal triggering zone, the selective allocation being in accordance with the sign of the signal change rate, and by counting the alternations between first and second monitoring signals (US.sub.1, US.sub.2) within a predetermined monitoring interval (Tu), the duration of which corresponds at least approximately to a half-period of the mains frequency.

REFERENCES:
patent: 3475655 (1969-10-01), Suzuki
patent: 3731152 (1973-05-01), Rockefeller, Jr.
patent: 4092691 (1978-05-01), Williams

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