The development of coil short circuits when transformer windings become contaminated with metal-containing colloidal particles |
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Authors: | S Yu L’vov E O Lyut’ko V N Bondareva V B Komarov Yu N L’vov |
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Affiliation: | 1.“Presselektro” Ltd.,Moscow,Russia;2.JSC “R & D Center for Power Engineering”,Moscow,Russia;3.A. N. Frumkin Institute of Physical Chemistry and Electrochemistry,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The radiational-thermal development of coil short circuits due to the action of partial discharges of the first kind when
the windings of transformers, autotransformers and shunting reactors become contaminated with metal-containing colloidal particles,
formed in the transformer oil as a result of the interaction of the oil with the constructional materials (the copper of the
windings, the iron of the tank, the core etc.) is considered. Acriterion of dangerous contamination of the coil insulation
of the windings by metal-containing colloidal particles is proposed, namely, 3% of the mass content of copper and iron in
it, which, if exceeded, may serve as a basis for recognizing the state of transformers, autotransformers and shunting reactors
at a voltage of 110 kV and above the limit. It is shown that filters for continuously cleaning the oil play a considerable
role in prolonging the life of transformer equipment. |
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