スローバンク故障時に流入する直流大電流の油中遮断保護方式

抄録

The accidental electric breakdown in arbitrary one of capacitors in a parallel connection of the large slow-capacitor bank may result in serious damages such as mechanical explosion and oil effusion or fire.
Because, breaking of the DC large current of follow in to a breakdown capacitor from normal capacitors is impossible. Therefore, many kinds of protective devices were made designed.
We do report how to get new knowledge about succeeding breaking of DC large current in oil by experiments.
Our view point is effect of surge absorption by parallel normal capacitors conected to the breaking device in accidental electric breakdown capacitor.
The result showed that breaking time is a value less than 2 milliseconds for a parallel connection bank more than 3 capacitors, each one is a SH-type capacitor (1200V in DC, 1200μF).