负荷波动可能会影响电缆终端的局部放电(partial discharge,PD)行为,为了研究负荷对终端局部放电行为的影响,通过在35 kV电缆终端中设计典型气隙缺陷,利用终端电-热协同老化平台进行对比实验,分析了不同负荷下终端局部放电及热稳态时的温度分布特征.此外,建立了终端有限元模型,对不同负荷下缺陷处温度进行仿真计算,分析缺陷处温度与终端局部放电行为之间的关系.结果表明:不同负荷下终端局部放电幅值、放电次数及放电相位分布存在明显差异;线芯与终端表面温差随着负荷增长而增加;气隙缺陷处温度高于25℃时终端局部放电强度显著增强.结合不同负荷及环境温度下终端气隙缺陷处的温度仿真,根据终端的负荷情况及测试现场的环境温度可以预测终端局部放电测量的合适时机,有利于对绝缘状态的准确评估.
The fluctuation of load would affect the partial discharge (PD) of cable termination. In order to study the influence of load on the PD behavior of cable termination, a typical air gap defect was designed on the 35 kV cable termination and then was conducted electrical-thermal ageing experiment. The PD behavior of termination under different loads and its temperature distribution at thermal steady state were analyzed. Moreover, a finite element model of termination was established to simulate the temperature at defect under different loads, and the relationship between temperature at defect and PD behavior of cable termination was investigated. The results show that the PD amplitude, discharge times, and discharge phase distribution of the termination under different loads are significantly different, and the temperature difference between the core and surface of termination increases with the growth of load. The PD intensity of termination enhances obviously when the temperature at defect is higher than 25℃. According to the temperature simulation results at the air gap defect of termination under diffrent loads and ambient temperatures, we can forecast the right time for PD measurement of termination, which is beneficial to evaluate the insulation condition accurately.
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