초고압용 조립형 접속함 모의계면에서 압력에 따른 절연파괴 및 부분방전 특성

Breakdown Voltage and Partial Discharge Characteristics at the Simulated Interface in a Prefabricated Joint for Ultra High Voltage Cable

PJB(Prefabricated Joint Box) is consisted of three major components ; an epoxy unit, a stress relief cone and a spring unit. The insulation structure of PJB is maintained by the interfacial pressure, and the dielectric performance at the interface depends on the interfacial pressure which is regarded as the most important factor for preventing breakdown failure. This experiment was performed to investigate breakdown voltage characteristic and partial discharge patterns under the controlled pressure conditions at the simulated interface. Finally, this paper presents the optimal pressure conditions at the interface by analyasing the PD patterns.