Title :
The influence of the material conditions on the breakdown behaviour of XLPE-samples at voltages of different shapes
Author :
Gockenbach, E. ; Schiller, G.
Author_Institution :
Schering Inst. of High Voltage Tech. & Eng., Hannover Univ., Germany
Abstract :
Breakdown investigations on XLPE power cables were performed using different voltage shapes. The breakdown voltages were found to be quite different. The highest breakdown voltage was measured at DC voltage with negative polarity and the lowest at AC voltage with 250 Hz. The DC strength is mostly influenced by the water content. While dry model cables have a very high breakdown strength up to 400 kV/mm, the value of wet model cables is approximately 80% of the former. If the model cables contain water trees, the DC breakdown strength is reduced further. The most sensitive voltage form in order to discover water trees is clearly the 0.1 Hz AC voltage
Keywords :
XLPE insulation; electric breakdown; electric strength; insulation testing; power cable insulation; power cable testing; trees (electrical); 0.1 Hz; 250 Hz; AC voltage; DC voltage; XLPE power cables; breakdown behaviour; breakdown strength; breakdown voltages; insulation breakdown tests; voltage waveforms; water content; water trees; Breakdown voltage; Cables; Composite materials; Conducting materials; Electric breakdown; Frequency; Shape; Test equipment; Testing; Trees - insulation;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549419
