The effects of thermal conditioning, under reduced pressure, on space accumulation in planar LDPE and XLPE samples under DC stress, have been investigated. The samples were conditioned prior to voltage application by being held at 80oC for 2-3 days in short circuit at rotary pump pressure. Some were then cooled to room temperature over a period of at least 6hr, still under rotary pump pressure and in short circuit, while others were cooled to room temperature in less than 1.5hr in the laboratory air. DC fields of 18kV/mm were then applied at room temperature, and space charge accumulation was monitored as a function of time using the PEA (Denmark) and LIPP (Australia) techniques. Conditioning did not prevent space charge accumulation in either the LDPE or XLPE samples.
|Title of host publication||1997 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena|
|Place of Publication||Pistcataway|
|Publication status||Published - 1997|
|Event||1991 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena - Minneapolis, United States|
Duration: 20 Oct 1991 → 23 Oct 1991
|Conference||1991 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena|
|Period||20/10/1991 → 23/10/1991|