H - Electricity – 02 – J
Patent
H - Electricity
02
J
323/20
H02J 3/18 (2006.01) G05F 1/70 (2006.01)
Patent
CA 1227536
ABSTRACT OF THE DISCLOSURE A device is taught for controlling the residual charge on a thyristor switched capacitor. A capacitor is in series circuit relationship with at least two bidirec- tional back-to-back thyristor switches which are then connected across an AC network. Each back-to-back thyris- tor combination is shunted by a non-linear clamping device which exhibits a very high resistance below a specified voltage level and a very low resistance above that voltage level. A pulse stretcher and a sequential firing circuit arrangement is used to prolong the conduction of one of the thyristor switches at a time to allow the shunting of its associated clamping device. During an overvoltage condi- tion in the AC network, the residual charge on the capaci- tor will be limited to the breakdown voltage of the conducting clamping device. A plurality of capacitor, thyristor switch, non-linear clamping device combinations may be utilized in parallel with the AC network.
495169
Oldham And Company
Westinghouse Electric Corporation
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