Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1998-03-13
2000-02-01
Leja, Ronald W.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
363 54, H02H 900
Patent
active
060210354
ABSTRACT:
An active power line compensation circuit for providing a power distribution network with a series compensation system that utilizes a transformer-coupled three-phase voltage-source inverter. A solid-state thyristor shorting ("crowbar") switch is provided on a third winding of a coupling series transformer. The transformer couples the ac output of a three-phase voltage-source inverter (VSI) to the power distribution network. The crowbar switch circuitry utilizes three diode-thyristor pairs, where each pair is connected to one phase leg of the VSI. The thyristors of the crowbar switch are each controlled by an fault output signal from an overcurrent or overvoltage sensor, that is coupled to a tertiary winding of the transformer. The fault signal closes the thyristors and thereby shunts overcurrent that would otherwise flow through the VSI. When the fault signal ceases, the thyristors automatically switch open when a null current is present in the normal three-phase line current.
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Larsen Einar V.
Ritter Allen M.
General Electric Company
Leja Ronald W.
Travnham Wayne O.
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