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1篇 您的检索式：作者名="Minghe Chi"

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		题名	作者	年代	出处	被引量
	1	Insulation degradation and fracture cracks of mechanical impacted thermal-ageing oil-impregnated papers显示文摘In order to elucidate mechanical impacts affecting the insulation strength of thermalageing oil-impregnated pressboards,we perform mechanical degradation experiments of impacting forces that are represented as the winding-suffered stresses on thermalageing oil-paper insulation in transient short-circuit of transformer.Water content,degree of polymerisation(DP),partial discharge inception voltage and AC breakdown field strength are tested and analysed for diverse thermal-ageing levels.An analytical model of mechanical degradation is established by relating dielectric breakdown strength to mechanical impact.Mechanical impacts result in less water content in thermal-aging oilimpregnated pressboards while causing reduction and increment of DP,respectively,in mildly and severely aged oil-impregnated pressboards.Partial discharge inception voltage and dielectric breakdown strength vary significantly with the numbers of impact cycles,showing a maximum value under low-intensity impact and decreasing monotonously under high-intensity impact.High-intensity mechanical impacts will evidently exacerbate the thermal deterioration process of oil-impregnated pressboards,which is primarily attributed to cellulose fibre fractures in pressboard cracks produced by equivalent tensile stress of mechanical impacts.It is acceptable for mildly aged oil-impregnated pressboards to suffer low-intensity mechanical impacts that will alleviate insulation degradation by restraining partial discharge in smaller oil-gaps and prolonging breakdown discharge pathways along impact-caused cracks.	Minghe Chi Ruochun Xia Yi Guan Weifeng Sun Ji Liu Qingguo Chen	2023	High Voltage2023，8，1：	1

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