Protective circuit for series capacitor banks

Details Protective circuit for series capacitor banks Protective circuit for series capacitor banks

1986-04-23

1987-10-27

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Capacitor protection

361 56, 361 91, H02H 716

Patent

active

047033851

ABSTRACT:
As overvoltage protection for a series capacitor (C1-C5) in a high-voltage network a voltage-dependent resistor (Z6), built up of metal oxide varistors, is arranged in parallel with the capacitor. In parallel with the resistor there is a spark gap means consisting of two series-connected spark gaps (G1, G2) for shunting the resistor in case of overload thereof. The energy for triggering the spark gap means is obtained from an auxiliary capacitor (C5), which is charged during operation, and is supplied to one of the spark gaps (G2) via a switching means (T1, T2), controlled by an overload detector (CU), and a pulse transformer (TR). A metal oxide varistor (Z5) is connected in series with the high voltage winding of the transformer. The transformer is connected so that the triggering pulse is in opposition to the voltage across the series capacitor.

REFERENCES:
patent: 4174529 (1979-11-01), Hamann
patent: 4432029 (1984-02-01), Lundqvist

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