Drying and Impregnation


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Drying and Impregnation
1010603 Drying and ImpregnationM.P. SinghM.V. PrabhakarIn the construction of a transformer, the insulation system is the most important feature, and hence requires maximum attention. Normally, the oil, paper, and pressboard insulation has to be freed of dirt, dust, and moisture for obtaining the optimum insulating properties.Cellulose insulation used in power transformers and reactors has 8 to 10% of moisture by weight at ambient temperature, being a hygroscopic material. Water is injurious to transformer insulation system, since it reduces the electric strength and the resistivity of the oil and accelerate the deterioration of solid insulation.
Citation
BHEL (Bharat Heavy Electricals Limited): Transformers, Second Edition. Drying and Impregnation, Chapter (McGraw-Hill Professional, 2003), AccessEngineering Export