| Title |
Analysis of Proper Frequency Range for Partial Discharge Diagnosis in Distribution Gas Insulated Switchgear |
| Authors |
고현상(Hyeonsang Ko) ; 윤성호(Seongho Yoon) ; 김정태(Jeongtae Kim) |
| DOI |
https://doi.org/10.5370/KIEE.2019.68.11.1382 |
| Keywords |
Distribution grade gas insulated switchgear; Partial discharge; Noise; Frequency characteristics |
| Abstract |
In order to improve the accuracy of partial discharge diagnosis by distinguishing internal partial discharge and external noises in distribution grade SF6 gas-insulated switchgear, partial discharges were measured for the on-site operated switchgears. Floating discharges due to water immersion defect in bushing, SF6 gas leakage defect, poor conductor-contact defect etc. were considered as internal discharges, and discharge by peeling semi-conductor paint in bushing was considered as external discharge. As a result, the main frequency bands of internal and external discharges were identified, and it was proposed that frequency bands of the partial discharge sensor would be designed in the range from 250MHz to 350MHz for detecting internal partial discharges. |