Dielectric Recovery Characteristics between Poles of 800kV Model Interrupter -I. Effects or separation between Moving Main Contact and Moving Arcing Contact-

800kV 모델차단부의 극간 절연회복특성 -I. 가동주접점과 가동아크접점간 이격거리의 변화에 대한 영향분석-

The capacitive current breaking capability as well as the short circuit current breaking capability is a very important factor in the performance of a circuit breaker. The dielectric recovery capability between poles should be considered in the desist of a circuit breaker because approximately two times of the maximum power system voltage might be applied between poles after the capacitive current be interrupted. The electric field and flow field analyses were utilized in the calculation of dielectric recovery characteristics between poles of 800kV model interrupter. The results show that the separation between moving main contact and moving arcing contact will affect to decrease significantly the electric field strength of a moving arcing contact and an insulation cover, to increase slightly the electric field strength of a fixed arcing contact and to decrease consequently the dielectric recovery capability between poles of the interrupter.