| Title |
A Analysis on the Partial Discharge Characteristics of 22.9kV CN-CV Power Cable Termination Defect |
| Authors |
박지만(Ji-Man Park) ; 강자윤(Ja-Yoon Kang) ; 문영채(Young-Chae Moon) ; 이진식(Jin-Sik Lee) ; 전정채(Jeong-Chay Jeon) |
| DOI |
https://doi.org/10.5370/KIEE.2023.72.11.1546 |
| Keywords |
Partial Discharge; Power Cable; Artificial Defect; Termination; HFCT |
| Abstract |
Since installation of power cables in EHV(extra-high voltage) distribution switchboard should be considered for tension and length of cables, termination processing is performed on-site and most of them are done manually, which can lead to unexpected defects. This paper investigates the partial discharge (PD) characteristics of artificially generated defect in a 22.9kV CN-CV cable termination.
First, a 22.9kV CN-CV power cable was cut to a length of 3m for a partial discharge test, and both ends were terminated. One terminal was separated by about 5mm between the end of the stress-cone and the plate washer in the waterproof cap to create a artificial defect. For comparison under the same environment, PD measurement was executed on a defective cables with two normal cables, and the voltage was applied of 13.2 [kV], 18 [kV] and 20 [kV], respectively. PD measurements were performed by installing a high frequency current transformer (HFCT) to the ground wire. As a result of PD measurement, insignificant surface discharge occurred at 13.2 [kV] in the defect cable, internal discharge was detected at 18 [kV], and internal discharge switching to surface discharge were detected at 20 [kV]. On the other hand, few surface discharge (mostly noise) was detected only at 20 [kV] in two normal cables. |