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Power transformers are reliable high performance electrical machines. The reliability of the power transformer is directly linked to the electrical insulation reliability. Well known and long time used paper-oil insulation system stands on the threshold of a new era. Due to the international agreements and environmental requirements it is compulsion to substitute petroleum based oils with synthetics...
Power transformers are inconsiderable group of the electrical appliances with two components insulation system. One of the components - liquid insulating medium plays two roles- insulating and cooling. It can be mineral as well as synthetic based liquid. Second component is an organic based solid insulation usually of cellulose character. Organic materials of this structure are sensitive to an operational...
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