2009 Volume 129 Issue 3 Pages 447-452
The integrated circuits with low driving voltages have been widely used in high-efficiency power equipments, information communication equipments, medical equipments so on. However these equipments are very liable to be weak when surges occur as lightning surges, switching surges and/or static discharges. The overvoltages generated from the surge will affect power apparatus and electric appliances, which make of deterioration. Moreover the overvoltages occur frequently in power switching devices or lightning phenomena as multi strokes. Therefore AC phase controlled testing apparatus superimposed with high voltage double pulses has been developed in order to investigate effects of overvoltages to insulating materials and surge protection devices. The developed device will control the double pulses at any phase angle with phase control circuits consisting of RC integrated circuits controlled by the triggering circuit of zero-cross AC power source. This paper describes a developed AC phase controlled testing apparatus superimposed with double pulses and small gap breakdown characteristics as one of its applications.