The Reduction Method of a Stray Load Loss of Distribution Transformer on the Bushing Flange Plate with STS

초록

This paper deals with the stray load loss on the bushing flange plate of low voltage side for high efficiency of the distribution transformer. To reduce the magnetic flux concentration, three models are proposed as follows. First, the basic transformer model is designed which is consisted of the windings, the core, the case and the bushing. Second transformer model is designed to creating a slit at the area where the magnetic flux on the bushing flange plate is concentrated and then attaching the STS (Stainless steel). In the third model, the bushing flange plate around the bushing terminal is cut into a large square shape and STS is attached. As a result of the simulations, when the material of the case is only steel, the stray load loss is 10.56 W, while the case with STS slit is 1.49 W and the case with STS plate is 0.17 W. The stray load loss reduction rate was 85.9% and 98.4% compared with the steel plate model. It is also verified by the load test using the distribution transformer based on simulation data. © 2019, The Korean Institute of Electrical Engineers.

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