考虑风速和光照影响的500kV避雷器温度分布研究

Temperature Distribution of 500kV Arrester Considering the Influence of Wind Speed and Sunlight

红外测温凭借其高效、精确等优点,在500 kV避雷器带电检测中发挥了重要作用,然而避雷器表面温度会受到风速、光照等外界因素的影响,给红外测温及故障诊断带来了一定的困难。本研究基于有限元原理建立了500 kV交流避雷器热电耦合的三维温度场仿真模型,并利用该模型对不同风速、光照影响下的避雷器温度分布进行仿真分析,结果表明:风速增大加强了空气对流散热,使得避雷器内部缺陷发热导致的表面最高温度下降,温升减小;避雷器表面温度随太阳辐射强度的增大而升高,且向阳侧高于背阳侧,但温升值变化不大。得出的结论对非理想环境下进行避雷器红外测温有一定参考意义。

Infrared temperature measurement plays an important role in the live detection of 500 kV arrester with its advantages of high efficiency and accuracy.However,the surface temperature of arrester will be affected by wind speed,sunlight and other external factors,which brings certain difficulties to infrared temperature measurement and fault diagnosis.Based on the principle of finite element,the author established a three-dimensional temperature field simulation model of 500 kV AC arrester coupled with thermoelectricity,to simulate and analyze the temperature distribution of arrester under the influence of dif-ferent wind speed and sunlight.The results show that the increase of wind speed strengthens the air convection and heat dissipation,which makes the maximum surface temperature decrease and the temperature rise decrease due to the internal defect heating of the arrester;the surface temperature of the arrester increases with the increase of solar radiation intensity,and the temperature of the sunny side is higher than that of the back,but the change of temperature rise is not great.The conclusion can be used as a reference for infrared temperature measurement of arrester in nonideal environment.