温度对金属氧化物避雷器(MOA)特征参量的影响及修正方法探讨

Influence of Temperature on Characteristic Parameters of Metal Oxide Surge Arrester(MOA) and Discussion on Correction Method

在近期的超特高压金属氧化物的现场交接试验和带电检测试验中,特别是在高温天气下,常发生试验结果不能准确反映避雷器运行状态的情况。针对以上问题,研究了温度对金属氧化物避雷器特征参量的影响,并根据试验结果,初步探讨了超特高压金属氧化物避雷器特征参量的温度修正方法。研究结论表明:避雷器直流参考电压随着温度的升高呈线性减小趋势,在60℃以内,其变化率基本在3%以内,电流性特征参量随着温度升高呈指数增大趋势,其中,75%直流参考电压下的泄漏电流增速最快。根据试验结果,提出避雷器特征参量温度修正方法、工作流程和判断标准,可提高避雷器试验的有效性和准确性。

Recently, the test results can not accurately reflect the operation status of EHV and UHV MOA in field handover test and live test of, especially in hot weather. The influence of temperature on characteristic parameters of arrester is studied in this paper to solve the problems. And then, temperature correction method of characteristic parameters of EHV and UHV MOA is discussed based on test results. It is suggest that： The DC reference voltage of MOA decreases linearly with the increase of temperature, and the rate of the change is less than 3% when temperature below 60℃ ; While the characteristic param- eters of current increase exponentially with the increase of temperature, and the growth rate of DC leakage current is fastest. Based on test results, the temperature correction method of characteristic parame- ters of MOA, the working flow and the judging standard are put forward in this paper, and then the effec- tiveness and accuracy of arrester test can be improved. The research results will provide the basis for arrester testing validity and fault criterion revision.