Charge accumulation in LDPE and XLPE conditioned at 80/spl deg/C under reduced pressure

R. Fleming, M. Henriksen, J. Holbøll
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引用次数: 1

Abstract

The effects of thermal conditioning, under reduced pressure, on space charge 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 80/spl deg/C for 2-3 days in short circuit at rotary pump pressure. Some were then cooled to room temperature over a period of at least 6 hr, still under rotary pump pressure and in short circuit, while others were cooled to room temperature in less than 1.5 hr in the laboratory air. DC fields of 18 kV/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.
在减压条件下,LDPE和XLPE在80/spl℃条件下的电荷积累
研究了减压条件下热处理对平面LDPE和XLPE样品在直流应力下空间电荷积累的影响。在施加电压之前,将样品在旋转泵压力下保持在80/spl度/C下短路2-3天。然后,其中一些在旋转泵压力和短路下至少6小时冷却到室温,而另一些在实验室空气中在不到1.5小时的时间内冷却到室温。然后在室温下施加18 kV/mm的直流电场,并使用PEA(丹麦)和LIPP(澳大利亚)技术监测空间电荷积累作为时间的函数。在LDPE和XLPE样品中,调节并不能阻止空间电荷的积累。
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