Method and apparatus for detecting fault currents in electrical

Details Method and apparatus for detecting fault currents in electrical Method and apparatus for detecting fault currents in electrical

1977-11-28

1980-06-17

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361110, 361 93, H02H 308

Patent

active

042086922

ABSTRACT:
A method of, and apparatus for, detecting fault currents, such as short-circuits in electrical loads, especially at direct-current supply networks, wherein there is produced a current signal corresponding to the load current and compared with a reference value and when a difference signal appearing as a result of such comparison exceeds a threshold value such is employed as a triggering criterion. The rise or slope of the current signal is detected and the reference value is obtained by storing the value of the current signal present upon detection of a predetermined rise.

REFERENCES:
patent: 3914667 (1975-10-01), Waldron
patent: 3970901 (1976-07-01), Rohr
patent: 3978374 (1976-08-01), Rohr
patent: 4012669 (1977-03-01), Gelfand et al.

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