Construction

The capacitors are oil filled and are housed in an aluminum casing having an explosion and fire proof system.

This system is based on the bulging of the upper deck of the capacitor following an internal over pressure which disconnects the internal connection. In this way the capacitor is disconnected from the mains before the casing reaches its limited of over pressure causing explosion or fire. An increase in the internal pressure is caused by the chemical decomposition of polypropylene film in areas where long and frequent self-healing discharges occur e.g. at the end of the capacitor’s life span or in case of an improper use of the capacitor.