Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1988-09-02
1990-02-27
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 86, 307 57, 307 85, H02H 700
Patent
active
049051172
ABSTRACT:
A method of selectively isolating faulty channels in a parallel electric power system having at least two controllable AC power sources includes the steps of producing a DC content signal representative of the magnitude of DC voltage in an AC output of one of the power sources and producing a differential current signal representative of differential DC current flowing in connected phases of the power sources. The DC content and differential current signals are combined to produce an error signal which is used to control the operation of the first power source, thereby reducing the magnitude of DC voltage in its output. When the error signal exceeds a predetermined threshold level, a trip signal can be produced and used to selectively isolate a failed channel in the power system. Following isolation of the channels, the differential current signal is disabled such that the error signal is only representative of the DC content signal for split channel operation.
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Gaffin Jeffrey A.
Jennings Derek S.
Lenart R. P.
Westinghouse Electric Corp.
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