An Experimental Method for the Evaluation of Moisture Content in Transformer Insulating Paper

Abstract

Due to the influence by an ageing state and environmental factor, the moisture in the transformer insulation paper is in a transient distribution state, the moisture content in the transformer insulation paper cannot be accurately acquired since the method for calculating the moisture content in the insulation paper and measuring the transformer power frequency dielectric loss by measuring the moisture content in the insulation oil in the engineering, so that the insulation performance of the transformer insulation paper cannot be effectively assessed, the invention discloses an experimental method for assessing and researching the moisture content of the transformer insulation paper, the moisture distributions in the transformer insulation paper under different ageing states at differenttemperatures can be acquired, and the average moisture content in the transformer insulation paper can be computed, thereby effectively assessing the insulation performance of the transformer insulation paper.

Description

technical field [0001] The invention belongs to the field of transformer insulation state evaluation, and in particular relates to an experimental method for evaluating and researching the moisture content of transformer insulating paper. Background technique [0002] As the core equipment of the power system and traction power supply system, the transformer's internal insulation performance determines the safety and stability of the power system and traction power supply system. [0003] Moisture is the main factor affecting the insulation performance of transformers, such as "Areview of moisture diffusion coefficients in transformersolid insulation-part 1: coefficients for paper and pressboard" published by D.F.Garcia, B.Garcia and J.C.Burgos (D.F.Garcia, B.Garcia, J.C.Burgos, "Areview of moisture diffusion coefficients intransformer solid insulation-part 1:coefficients for paper and pressboard," IEEE Electrical Insulation Magazine.Vol.29, no.1, pp.46-54, 2013), the presen...

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Problems solved by technology

[0003] Moisture is the main factor affecting the insulation performance of transformers, such as "Areview of moisture diffusion coefficients in transformersolid insulation-part 1: coefficients for paper and pressboard" published by D.F.Garcia, B.Garcia and J.C.Burgos (D.F.Garcia, B.Garcia, J.C.Burgos, "Areview of moisture diffusion coefficients intransformer solid insulation-part 1:coefficients for paper and pressboard," IEEE Electrical Insulation Magazine.Vol.29, no.1, pp.46-54, 2013), the presence of moisture will accelerate The aging rate of transformer insulating paper leads to a decline in the dielectric properties of the transformer's internal insulation, and even leads to partial discharge of the transformer's internal insulation. In order to effectively evaluate the insulation performance of the transformer's internal insulation, it is necessary to obtain the moisture content in the transformer insulating paper. Li Jian et al. "Characteristics of moisture diffusion in vegetable oil-paper insulation" (J.Li; Z.T.Zhan, et.al., "Characteristics of moisture diffusion in vegetable oil-paper insulation," IEEE Transactions on Dielectrics and Electrical Insulation. Vol.19, no.5, pp.1650-1656, 2012) pointed out that at present, the moisture content in insulating paper is often estimated by measuring the moisture content in insulating oil or evaluating the damp state of transformer internal insulation by measuring the power frequency dielectric loss of transformers in engineering sites. However, due to the influence of the aging state of the insulating paper and environmental factors such as temperature and humidity, the moisture content in the transformer insulating paper is always in a transient distribution state, and it is impossible to effectively evaluate the transformer insulation through the measurement of the moisture content in the insulating oil and the power frequency dielectric loss. moisture content in paper

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