现场用GIS冲击耐压试验及局部放电检测装置设计

国内外一些研究和实际运行经验发现,已通过工频局部放电检测的不少GIS试品在投入运行后不久依然出现绝缘类故障,因此针对GIS设备提出进行冲击耐受试验及其局部放电检测,以及时发现内部隐患,确保设备安全稳定运行。在充分调研现场GIS冲击耐压试验及其局部放电检测必要性的基础上,结合GIS设备冲击耐受试验条件,设计了一套便于现场试验时的局部放电检测装置,利用该装置对800kV断路器和750kV变电站GIS组进行了冲击耐压试验下局放检测,并对现场检测的抗干扰措施进行了探讨。试验结果证明了GIS冲击电压下局部放电检测的可行性,及局部放电检测装置的有效性。

Field Test and Analysis of Partial Discharge on GIS Under Impulse Voltage

It is shown that many GIS devices still have insulating faults even after they have passed partial discharge test under power frequency voltage.Hence,it is necessary to experimentally study the partial discharge on GIS under impulse voltage so as to timely identify internal incipient faults and to insure stable and safe operations of equipment.We designed a set of partial discharge detection devices which could be conveniently applied in the field experiment considering the conditions of impulse voltage experiment on the basis of investigating the necessity of partial discharge of GIS under impulse voltage,and applied the device in partial discharge detection on several 800 kV breakers and GIS devices of 750 kV substation.Moreover,we discussed anti-interference measures in field experiment.The results indicate that the test device is effective.