抄録
The high voltage ceramic capacitor of unit type has been developed for gas insulated switchgears. The capacitor has good advantages such as complete dry type and the easy adjustment of the series connection for the different rated voltage. There were main two problems to be solved.
One was the improvement of the electric field concentration around the edge of the electrodes which were composed with thin silver layer. The reduction of gap around the flat surface of a capacitor leads to the significant increase in the breakdown voltage of the full wave lightning impulse voltage.
The other was the improvement of the reverse piezo electric effect which greatly affected mechanically and electrically combined breakdown for the chopped wave. The application of the metal reinforced terminals on the both flat surface improves the breakdown characteristics for the steep wave.
