【作者】 刘华昌； 于成龙； 冉汉政； 何承基；

【Author】 LIU Hua Chang,YU Cheng Rong,RAN Han Zheng,HECheng Ji (the Institute of Electronic Engineering of CAEP,SiChuan MiangYang 621900)

【机构】 中国工程物理研究院电子工程研究所；

【摘要】 在局部放电测试试验中干扰的存在对局部放电检测和识别的结果将产生很大的影响。通过认识局部放电的机理,产生局部放电的原因以及干扰的来源和种类,分析了试验回路中存在的干扰,为了减小高压电容器直流局部放电测试中干扰的影响和提高试验抗干扰性能,采取了增加隔离变压器、滤波器、接独立地线等相应的抗干扰改进措施,通过示波器采集到的输入电压的波形变得更平滑;并通过对比试验,测量得到环境干扰的放电量与放电次数,得出Q-N图表明改进前后相同放电量对应的放电次数明显减少,其噪声幅度变得更小。更多还原

【Abstract】 In the Partial Discharge(PD) testing, the interference is existing, It will affect the results of PD test and identification. It introduces the PD mechanism, the reason of PD occurrence, the source and sorts of interference, it analyses the interference in test circuit. In order to reduce the effect of interference and improve the anti-interference in High VoltageCapacitor PD detection under DC, It added the transformer, filter and isolated ground, and such on, anti-interference measure accordingly. It finds that the oscillogram of input voltage which gained by oscilloscope is more smooth. We detect the discharge Q and number N of background noise by contrastive experimentation, it gets the Q-N graph, the results indicate that the number of PD is smaller than that without improvement, the noise amplitude is smaller than before.更多还原