Current limiter for electrical transmission/distribution protect

Details Current limiter for electrical transmission/distribution protect Current limiter for electrical transmission/distribution protect

1996-10-15

1998-09-22

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

361 19, 361 63, 361 98, 361107, 323363, H02H 900, H02H 700

Patent

active

058123539

ABSTRACT:
A current limiter arrangement particularly adapted to be positioned at a substation of an electrical power system for limiting the fault current for a predetermined period of time to permit protective devices positioned downstream in the network to clear the fault. If the fault is not cleared and the fault persists for a predetermined period of time the current limiting arrangement acts as a circuit breaker to open the load circuit. The arrangement includes an SCR bridge having a superconducting coil connected across two nodes. A novel gate pulse firing circuit generates two pulses per ac cycle for application to the gates of the SCR's of the bridge at 90.degree. and 270.degree. of each 360.degree. cycle and is ON at all times to provide for prompt dc charging of the super conducting coil with no ac load current and non-fault conduction of ac current at less than the maximum current limit. The gate pulse firing circuit by staying ON at all times also provides current limiting under the fault condition and recovery of the dc superconducting coil current after the fault is cleared by a downstream protective device and is turned OFF only after a predetermined period of time for opening of the load circuit.

REFERENCES:
patent: 4490769 (1984-12-01), Boenig

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