Title :
Examination of the breakdown site in new and aged polyethylene insulated cables
Author_Institution :
Electr. Council Res. Centre, Chester, UK
Abstract :
Discharges have been monitored and located in short lengths of cable tested to breakdown. These tests have been used to detect prebreakdown deterioration. The discharge location system is novel and has enabled limited energy breakdown sites to be located. Not all the breakdowns were initiated at the region of the inner screen boundary. In short-term tests to breakdown on new and dry aged cables at a maximum field of 30 MV/m there was no gradual increase in the discharge level above the detection limit of 1 pC. It appears possible that ageing with applied voltage at ambient temperature can improve the breakdown strength
Keywords :
ageing; cable insulation; discharges (electric); electric breakdown of solids; insulation testing; organic insulating materials; polymers; aged polyethylene insulated cables; ageing; breakdown site; breakdown strength; discharge location system; dry aged cables; electric discharges; inner screen boundary; prebreakdown deterioration detection; short-term tests; Aging; Cable insulation; Cables; Electric breakdown; Fault location; Monitoring; Polyethylene; Pulse shaping methods; Testing; Voltage;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1989., Proceedings of the 3rd International Conference on
Conference_Location :
Trondheim
DOI :
10.1109/ICSD.1989.69162
