Title :
Experimental study on the causes of electrical breakdown of EHV XLPE insulation using `prebreakdown partial discharge detection method´
Author :
Suzuki, Hiroshi ; Endoh, Takeshi ; Sekii, Yasuo
Author_Institution :
Hitachi Cable Ltd., Ibaraki, Japan
Abstract :
The causes of electrical breakdown in EHV XLPE (cross-linked polyethylene) cables were clarified by carrying out the prebreakdown partial discharge (PBPD) detection test under electric stresses from 40 to 70 kV/mm. Ten causes of electrical breakdown were observed in the PBPD test. As expected, it was found that they were associated with very small contaminants and protrusions. The electrical tree inception stress was estimated to be 270 kV/mm on the average. The prebreakdown time was estimated to be on the order of 1 hour under an applied electric field of 5 kV/mm
Keywords :
cable insulation; cable testing; failure analysis; insulation testing; organic insulating materials; partial discharges; polymers; EHV XLPE cables; EHV XLPE insulation; PBPD test; XLPE; cable insulation; causes of electrical breakdown; cross-linked polyethylene; electric stresses; electrical tree inception stress; partial discharge detection test; prebreakdown partial discharge detection method; prebreakdown time; protrusions; small contaminants; Breakdown voltage; Cable insulation; Circuit testing; Dielectrics and electrical insulation; Electric breakdown; Optical microscopy; Partial discharges; Pulse transformers; System testing; Trees - insulation;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1990. Annual Report., Conference on
Conference_Location :
Pocono Manor, PA
DOI :
10.1109/CEIDP.1990.201351
