System for coupling a capacitance to an ac voltage network

Details System for coupling a capacitance to an ac voltage network System for coupling a capacitance to an ac voltage network

G - Physics

05

F

328/193, 323/20

G05F 1/70 (2006.01) H02J 3/16 (2006.01) H02J 3/18 (2006.01) H03K 17/13 (2006.01)

Patent

CA 1159522

Abstract A series combination of a capacitor, a choke, and a switch is connected across two conductors of an AC voltage network to compensate for inductive reactive loads placed on the network by consumers. The capacitor is advantageous- ly coupled to and decoupled from the conductors in the AC voltage network by closing and opening the series switch. During the time that the switch is opened and the capacitor is decoupled from the network, the capacitor is discharged in accordance with a predetermined discharge characteristic. Prior to coupling the capacitor to the network, the switch is briefly closed at a predetermined phase angle of the voltage of the network, the phase angle being selected in response to the magnitude of the residual voltage present on the capacitor. In this manner, the capacitor can be coupled to the network without causing transients therein. In some embodiments, a plurality of capacitors forming a capacitor battery are each provided with an associated switch so that the capacitors in the capacitor battery can be individually coupled to the network. The phase angle at which each of the capacitors in the capacitor battery is coupled to the network is determined in response to the number of capacitors already coupled to the net- work, and the number of capacitors which remain to be coupled.

374211

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