应用三维电磁–热–流耦合场分析法计算换流变压器干式套管的温度场分布

3D Coupled Electromagnetic-Thermal-Fluid Method for Computation of Temperature Field of Converter Transformer RIP Bushings

换流变压器阀侧干式套管主绝缘材料为环氧树脂/皱纹纸复合材料,散热能力较差,随着输送功率的提高,套管载流量的升高,发热问题已成为制约换流变干式套管安全稳定运行的瓶颈。该文以400k V换流变干式套管为研究对象,采用三维电磁–热–流耦合场分析方法,考虑了热辐射、热传导和对流传热的影响,计算分析了其三维温度场分布,得出了套管内部的温度分布规律。同时,为了验证所用仿真方法的准确性,对400k V换流变干式套管进行了温升试验,对比了测量点的仿真计算结果与温升试验结果,试验结果表明仿真结果与测量结果的差值低于8%,证明了该方法的合理性,可为换流变干式套管的设计提供计算依据。

Epoxy impregnated paper as the main insulation material of converter transformer bushings has bad heat dissipation ability. With the increase of transmission power and current carrying of bushings, heating problem has become a bottleneck for the safe and stable operation of converter transformer resin impregnated paper（RIP） bushings. In this paper, taking the 400 k V converter transformer RIP bushing as research subject, a 3D coupled electromagnetic-thermal-fluid analysis method has been adopted; processes including heat radiation, heat conduction and heat convection had been taken into account; the temperature field of 400 k V converter transformer RIP bushing had been calculated and analyzed; temperature distribution law of converter transformer RIP bushings had been obtained. At the same time, in order to verify the reasonableness of simulation methods for 400 k V converter transformer RIP bushings, the temperature rise experiment had been carried out. According to the experiment results, the percentage of temperature difference that between simulation results and experiment results is below 8%. It proves the simulation method is reasonable. This paper provides basis for the design of converter transformer RIP bushings.