Method and apparatus for sensing the clearance of fault current

Details Method and apparatus for sensing the clearance of fault current Method and apparatus for sensing the clearance of fault current

1979-09-06

1981-04-21

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Automatic reclosing

361 94, 361110, 361 58, H02H 306

Patent

active

042636353

ABSTRACT:
A method and apparatus for sensing the clearance of a fault current on an ac transmission line and providing a fault cleared signal for closing a current limiter bypass switch includes the technique of successively sensing half cycles of current magnitudes of the system after establishing a predetermined fault current threshold and producing a fault clear signal only when a signal indicating the threshold has been exceeded is followed by two subsequent signals indicating that the threshold has not been exceeded by the two half cycles of current.

REFERENCES:
patent: 3530360 (1970-09-01), Relation
patent: 3609461 (1971-09-01), Obenhaus et al.
patent: 3878436 (1975-04-01), Bogel
patent: 3982158 (1976-09-01), Knauer
patent: 4084204 (1978-04-01), Jacobus, Jr.

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