Abstract
The result of our investigation whether it is possible or not to anticipate the electrical breakdown of magnet coils used in magnet relays is reported. We employed the method of counting partial discharge pulses. Magnet relays used in various power facilities sometimes come to brekdown. It is faborable if we anticipate the failure of magnet coils beforehand. We examined the current pulse characteristics of partial discharges. From our experiment and statistical treatment of the data we concluded that the discharge pulse counting method is useful for anticipating the failure of magnet coils used in power systems.
