电容式套管介损偏大引出的正接法公式的探讨

Discussion on Positive Connection Method Formulas Extracted By Capacitive Bushing Larger Medium Loss

在以往使用正接法测量高压电气设备绝缘介质损耗时,所使用的计算公式和并联在被试品两端的电容量无关,但近年预防性试验发现,并联在被试品两端的电容对介损的影响不容忽视,介绍了被试品并联电容及回路接触电阻对介损测试影响的模拟试验结果和分析,提出了正确应用考虑并联电容和接触电阻因素的介损计算公式的建议。

The isolation medium losses of high voltage electrical equipments were measured previously by the positive connection methods,and the calculation formulas used had no relationship with the capacity of the capacitor paralleled on the two sides of experimental materials.However,the preventive experiments in recent years found that the influence of the capacitor paralleled on the two sides of experimental materials on the medium losses could not be neglected.The simulation experimental results and analysis of the effects of the paralleled capacitor of the used experimental materials and the circuit contact resistance on the medium loss testing were presented.The suggestion was made on the correct application of the loss calculation formulas considering the paralleled capacitor and the contact resistance.