23kV급 조립형 케이블 접속재에서 부분방전 신호의 초음파 검출특성

Ultrasonic detection properties for partial discharge at the premolded joint of a 23kV cable

In this paper, ultrsonic detection properties at a premolde joint utilized in a 23kV cables are studied. In a experiment a artificial defect within a joint and a measuring system are builded for generating discharges, gathering data about a detection properties, respectively. The experiment results show that one point detection is not allowed for monitoring a global status of a joint discharges and a detection sensitivity is less than 100pC. And also the attenuation and wave speed at the material of joint insulator are obtained.