单相500kV GIS电子式组合互感器发热有限元分析

Finite Element Calculation about the Heat of Single-phase 500 kV GIS Electronic Combined Transformer

温度变化会影响电子式互感器的测量准确度,500 k V GIS电子式组合互感器通常布置在户外,在实际运行中由于电阻损耗、太阳照射等因素而温度上升,甚至超过允许温升,从而影响其工作性能.为了准确分析其损耗发热问题,保证其工作的安全性和可靠性,运用有限元方法,建立了损耗发热的流场-温度场耦合求解模型,在综合考虑了太阳照射、外壳环流、气体流动以及重力等因素影响的基础上,计算分析了其流场和温度场分布规律.结果表明:温度场分布呈左右基本对称,上部温度高于下部温度,最高温度在导体顶部,最低温度在导体正下方.所得结论对于电子式互感器的散热设计具有一定的参考价值.

The variation of temperature may influence the measuring accuracy of electronic transformer. 500kV GIS electronic combined transformer is usually arranged in the open air, so the temperature will rise because of factors such as resistance loss, sun exposure, ere, even exceed the permitted temperature in practical operation, which will influence its work performance. To analyze its loss and heat accurately and ensure the safety and reliability of its operation, a fluid-thermal coupled solution model was established by using finite element method, which calculated and analyzed the distribution regularities of the fluid field and thermal field in consideration of factors such as sun exposure, shell current circulation, gas flow and gravity. The results show that thermal field distribution has the geometric regularity of basic symmetry on both sides and upper temperature is higher than the lower temperature. The highest temperature appears on the top of the conductor and the lowest temperature appears directly below the conductor. The conclusions can provide some reference for the heat dissipation design of electronic transformer.