特殊结构110kV GIS气室器件耐压及MOA泄漏电流试验

Withstand Voltage and MOA Leakage Current Test for 110 kV GIS with Special Structure

为了发现气体绝缘全封闭组合电器GIS器件绝缘缺陷,需要对GIS进行验收试验或定期预防性试验。试验过程中,由于机械结构原因,通过常规手段对某些气室的盆式绝缘子及开关无法进行耐压,金属氧化物避雷器(MOA)泄漏电流试验难以实现。提出电磁式电压互感器(PT)的3倍频感应耐压试验方法,对特殊结构110 k V GIS气室器件进行耐压,并测量MOA在持续运行电压下的交流电流分量。试验过程中,计算分析了容升电压、分布电容等影响因素,并测得一次侧尾端电流、二次侧电流与补偿电抗量的规律。现场试验结果证明了所提试验方法的可行性。

To detect the insulation defects of the GIS with special structure, acceptance test and periodic preventive test are necessary. Because of the special structure, the withstand voltage of GIS gas chamber cannot be tested by conventional methods, and the leakage current test of metal oxide arrester （MOA） is also difficult. In this study, a triple-frequency test method with electromagnetic potential transformer was proposed to test the withstand voltage of the gas charmer of 110 kV GIS,and to measure the leakage current of MOA. The influencing factors, such as capacitive voltage-augment and distributed capacitance, were analyzed during the test, and the relationship among primary current, secondary current and compensating reactance were achieved Test results validate the proposed method.