H - Electricity – 02 – H
Patent
H - Electricity
02
H
317/6.5
H02H 7/16 (2006.01) H02H 7/00 (2006.01) H02J 3/18 (2006.01)
Patent
CA 1194097
- 10 - ABSTRACT OF THE DISCLOSURE A protective means for a series capacitor in a high- voltage network comprises a voltage-dependent resistor (varistor) arranged in parallel with the series capacitor, a spark gap arranged in parallel with the varistor for shunting the latter when it becomes overloaded, a current- sensing member, for example a current transformer, for sensing the current through the varistor, an energy absorption detector for sensing the temperature of the varistor, and a pulse transformer electrically or magnet- ically connected to the current-sensing member, for triggering the spark gap. During normal operation of the network and the series capacitor the current-sensing member is short-circuited by a normally closed switching device. This switching device is controlled by the energy absorption detector in such a way that the switching device is opened if the temperature of the varistor exceeds a predetermined level, whereby a trigger pulse, generated directly by the varistor current via the current-sensing member and the pulse transformer, may pass to the spark gap.
406599
Asea Aktiebolag
Robic Robic & Associes/associates
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