Series capacitor equipment

Details Series capacitor equipment Series capacitor equipment

1985-02-27

1987-03-24

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Capacitor protection

361 56, 361 58, 361 91, 361127, H02H 716

Patent

active

046529632

ABSTRACT:
A series capacitor bank for connection into an electric power supply network is provided with overvoltage protective equipment having two branches connected in parallel with the capacitor bank. The first branch comprises 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 preferably not more than 2.0 times) the "knee" voltage of the first varistor.

REFERENCES:
patent: 3641358 (1972-02-01), Lian et al.
patent: 4152743 (1979-05-01), Comstock
patent: 4164772 (1979-08-01), Hingorani
patent: 4347539 (1982-08-01), Peterson et al.
patent: 4432029 (1984-02-01), Lundquist

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