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Abstract. This paper changed temperature conditions to simulate by finite element software. We can observe the simulation results of the BLDC (brushless director current motor) stator resistance. Then we applied formula to calculate the BLDC stator resistance. At last, measuring the stator resistance of different temperatures by high temperature box, we could contrast the above results. We got the conclusions that the simulation had the characters of more convenient, simple, accurate than the formula method.

The dielectric parameters of oil-immersed insulation paper, semi-conductive paper and mineral oil were measured at different temperature. The quantitative analysis about the influence of the equalizing cage density on the Inverted-type Oil-immersed Current Transformer (IOCT) electric field distribution was studied, and the temperature dependence of the insulation material dielectric parameters were taken into consideration. In high temperature conditions, the oil-paper damage of IOCT insulation system is generally not caused by electric breakdown but heat aging. The maximum electric field strength of oil-paper I is approximately reduced by 12.84%, and that of the oil-paper II is reduced by 0.35%, after the equalizing cage density is increased. The increasing of the equalizing cage density will be beneficial to the electric field equidistribution of the IOCT insulation system.