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The oil-impregnated insulation paper (OIIP) is widely used in oil-impregnated high voltage apparatuses. The thickness is an important parameter which affects its electrical breakdown strength. This paper presents an experiment research on the influence of OIIP's thickness on breakdown strength under AC, DC and pulsating DC voltages. The short time breakdown experiments were executed and the Weibull...
In order to obtain the influence of metallic particles on the insulating performance of vegetable insulating oil, copper particles were chosen to contaminate the vegetable insulating oil. The AC breakdown voltage of rapeseed insulating oil with different copper particle concentrations was measured. The dielectric properties i.e. relative permittivity, dielectric loss tangent and volume resistivity...
As the important part of the transformer insulating, the insulation performance of oil-paper directly affects the security and stable operation of the transformer. In order to study the influence of temperature and thermal aging on the breakdown voltage of oil-paper insulation, breakdown voltage test of transformer's oil-paper was carried out, and breakdown voltages of oil-paper insulation were obtained...
The valve side Wingdings of converter transformers withstand complex electric stress, and the minor insulation of converter transformers withstand combined fundamental AC and harmonic voltages. Surface partial discharge is a main form of discharge occurring in minor insulation and there is a severe lack of empirical research on surface partial discharge in oil-impregnated insulation paper at harmonic...
Paper insulation in transformers degrades due to the effect of thermal, electrical, mechanical and chemical stress and monitoring of the insulating paper aging thus becomes important to the safe operation of transformers. In this paper accelerated thermal aging experiments were conducted at 130 centigrade degrees for insulation paper with insulating oil. The cellulose fibers in insulating oil of each...
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