Series capacitor equipment

Details Series capacitor equipment Series capacitor equipment

H - Electricity

02

H

317/6.5

H02H 7/16 (2006.01)

Patent

CA 1255748

- 13 - ABSTRACT OF THE DISCLOSURE A series capacitor bank for connection into an elec- tric power supply network is provided with overvoltage protective equipment having two branches connected in parallel with the capacitor bank. The first branch com- prises a first zinc oxide varistor in series with a linear resistor and the second branch comprises a varistor with a higher "knee" voltage than the first zinc oxide varistor. The resistance of the linear resistor is preferably of the same order of magnitude as the absolute value of the impedance of the capacitor bank at the operating frequency of the power supply network. The "knee" voltage of the second varistor is at least 1.15 times (and pre- ferably not more than 2.0 times) the "knee" voltage of the first varistor.

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