Shuaibing Li ID , Guoqiang Gao, Guangcai Hu, Bo Gao, Haojie Yin, Wenfu Wei * ID and Guangning Wu School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China; [email protected] (S.L.); [email protected] (G.G.); [email protected] (G.H.); [email protected] (B.G.); [email protected] (H.Y.); [email protected] (G.W.) * Correspondence...

power system overvoltages due to switching, lightning and other disturbances are the main problem for designers of the power transformers. once some frequencies of the incoming surges match with some of the natural frequencies of transformer winding, the resonance phenomenon is expected in transformer winding. the resonant overvoltages may destroy the insulation between turns and cause to insul...

The onboard traction transformer is a critical equipment of high-speed trains, its running state directly affects the safety and stability train’s operation. Given complexity condition transformer, this paper proposes diagnosis algorithm based on kernel principal component analysis (KPCA) fuzzy clustering. To fully extract status information aging characteristics insulating oil main insulation ...

For good transformer condition assessment it is necessary to determine the of insulating materials, both liquid and solid. Transformer reliable for as long its insulation system resists deterioration. Therefore, thermal oxidation stability are important characteristics oil. It a measure oil resistance decomposition by influence oxygen temperature. Oils with retain their regardless stress. Becau...

This paper describes the design of a middle-frequency power transformer, its material composition and magnetic circuit windings, operating in frequency range 800 to 2000Hz, with capacity 200kVA, air-cooled, be fed from suitable converter, characterized by reduced noise. The proposed solution allows implementation galvanically isolated DC-DC converters for auxiliary traction drives other convert...