LI Jianbo, GAO Wensheng, LIU Weidong. Evolution Process and Severity Assessment of the Partial Discharge Caused by Immobilized Metal Particles on DC GIL Insulator Surface[J]. High voltageapparatus, 2018, 54(5): 9-16.
LI Jianbo, GAO Wensheng, LIU Weidong. Evolution Process and Severity Assessment of the Partial Discharge Caused by Immobilized Metal Particles on DC GIL Insulator Surface[J]. High voltageapparatus, 2018, 54(5): 9-16. DOI: 10.13296/j.1001-1609.hva.2018.05.002.
Immobilized metal particles on DC GIL insulator surface significantly reduce the flashover voltage on theinsulator surface
which is a common defect in DC GIL. To study the evolution process and severity assessment ofpartial discharge caused by immobilized metal particles on DC GIL insulator surface
we established a 220 kV GIL equipment platform. By gradually increasing voltage and then using the ultraviolet viewer observed the entire partialdischarge evolution process on insulator surface. Meanwhile
analyzed the average amplitude and time interval ofpartial discharge. The results show that:the severity of partial discharge caused by the immobilized metal particles inthe insulator surface of the GIL can be classed into three levels: mild discharge
moderate discharge and severedischarge;as the discharge process intensified
the average amplitude and time interval of partial discharge followedthe change. The statistical parameter Sk/Kuof average amplitude and time interval of partial discharge can be used toevaluate the severity of the defect caused by immobilized metal particles on DC GIL insulator surface.