Apparatus for improved protection against lower magnitude faults

Details Apparatus for improved protection against lower magnitude faults Apparatus for improved protection against lower magnitude faults

1989-05-10

1990-11-27

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Automatic reclosing

361 72, H02H 324

Patent

active

049741128

ABSTRACT:
Apparatus for improving the performance of conventional electromagnetic reclosing relays under continuous lower magnitude ground or phase faults in electrical power distribution systems. An incomplete sequence relay is connected to the reclosing relay to render the timing drum or cam of the reclosing relay operative when the contacts of the circuit breaker are open, and to reset the reclosing relay after a selected time interval when the breaker is closed. This arrangement prevents timing problems associated with lower magnitude faults which otherwise keep the reclosing relay from reaching its lockout condition.

REFERENCES:
patent: 2861223 (1958-11-01), Seller et al.
Type RC Automatic Reclosing Relay Instructions Westinghouse Electric Corp. 12 pp. 4/54.
Reclosing Relay Type NLR11A Instructions, General Electric Co., 26 pp., 2/69.
Agastat 7000 Series Timing Relay Data Sheets, Amerace Corp., Union, N.J. 2 pp. 4/85.

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