Abstract
The problems related to the effects of high moisture content in the transformer insulation system and the risk resulting from the need for its immediate drying can be avoided by using a non-invasive method of continuous drying of solid insulation by means of high hygroscopic sorbents. The article compared the hygroscopicity of selected sorbents: molecular sieves 3A, 5A and 13X, aluminum oxide and silica gel. It was found that the highest hygroscopicity, for a low value of relative air humidity, is characterized by a 13X molecular sieve. For this reason, this material was selected for further testing by checking its ability to dry mineral oil.
Highlights
Power transformers are one of the most important elements of the power system
Drying of the insulation system by the electro-insulating liquid is based on the phenomenon of water migration from cellulose material with higher relative humidity to the insulating liquid with lower relative saturation
Several sorbents were selected for the study, which according to the literature, show high hygroscopicity and could be used as a material for drying electro-insulating liquids, and indirectly for drying the transformer’s cellulose insulation
Summary
Power transformers are one of the most important elements of the power system. Their reliable operation affects on the stability of the electricity transmission and distribution systems. Drying the electro-insulating liquid by means of a sorbent can be used to maintain a low level of water content in oil-paper insulation throughout entire lifetime of transformer. Several sorbents were selected for the study, which according to the literature, show high hygroscopicity and could be used as a material for drying electro-insulating liquids, and indirectly for drying the transformer’s cellulose insulation. The highest water absorption capacity was found in the 13X molecular sieve, where the final water content was equal to 19.45%. For this reason, this material was selected for further research
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