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US 4,398,141 AGranted
Static VAR generators
AssigneeWestinghouse Electric Corp.
InventorsMichael B. Brennen, Laszlo Gyugyi, Eric J. Stacey
Life of this patent
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Abstract
There is provided by this invention a static VAR generator having an auxiliary shutdown firing pulse generator that initiates a thyristor controlled inductive current to cancel only capacitive current supplied by the static VAR generator in the event of failure of the VAR generator's control means monitoring the capacitive current requirements.
Claims3
A static VAR generator, comprising:
- (a) a capacitive current means disposed for connection into an AC network;
- (b) a monitoring means connected to said AC network for monitoring the capacitive current requirement of the AC network;
- (c) a control means connected to said capacitive current means and said monitoring means for causing connecting of said capacitive current means into said AC network in response to the reactive requirements of said AC network;
- (d) switching means for connecting said capacitive current means into said AC network;
- (e) an auxiliary transient free shutdown means for allowing said switching means to disconnect said capacitive current means from the AC network without causing restriking transients in the event of failure of said monitoring means or said control means;
- and
- (f) surge suppression means for suppressing transients that may result from operation of said auxiliary transient free shut down means.
4 more elements
Dependencies are inferred from the claim text.