PC和PET油中热老化分解物特性分析

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Abstract As an important part of oil-immersed power transformer,the performance of the oil-paper insulation system can directly affect the reliability and the service life of transformers.The insulation paper has both high permittivity and dielectric dissipation.Furthermore,the insulation paper also has unwanted disadvantages,such as low heat proof and low aging resistance.These defects have restricted the development of theoil-immersed transformer towardsthe compact type with high capacity.Two kinds of the polymer materials,i.e.the polycarbonate (PC) and the polyester film (PET),are chosen as the candidates for comparison with the insulation paper.Every materialisaged for 300 days in the transformer oil under different temperatures of 90 ℃,110 ℃,and 130 ℃ respectively.They arethen tested for the resultant in oil,the acid value,the dissolved gases in oil,and the mechanical strength.Combined with the change of their degree of polymerization (DP) and scanning electron microscope (SEM),the aging behaviors of three materialsareanalyzed to find the characteristic quantity to judge the degree of aging.

Key words： Polymer materials thermal aging resultant in oil acid value dissolved gas in oil surface micromorphology

Received: 11 February 2015 Published: 16 March 2016

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TM852

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	Wang Wei
	Yang Kai
	Liu Han
	Yi Denghui

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Wang Wei,Yang Kai,Liu Han等. Analysis of the Thermal Aging Decomposition Characteristics of PC and PET in Oil[J]. Transactions of China Electrotechnical Society, 2016, 31(5): 152-163.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I5/152

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