检测GIS固体绝缘内部放电缺陷的特高频和X射线数字成像联合方法研究

Research on Combined Method of Ultra High Frequency and X-ray Digital Imaging for Detecting Internal Discharge Defects of GIS Solid Insulation

相比超声波局部放电检测法,特高频局部放电检测法对GIS固体绝缘内部放电缺陷检测灵敏度和定位精度较高,但无法确证此类缺陷部位和类型,据此制定的设备检修策略难以保证完善、准确。因此,文中研究了特高频局部放电和X射线数字成像联合检测GIS固体绝缘内部放电缺陷的方法,使用特高频局部放电检测法对固体绝缘缺陷进行检测和定位后,在设备检修期间应用X射线数字成像技术对缺陷进行可视化确证。该方法在某110kV变电站110kV GIS的带电检测中成功发现隔离开关绝缘拉杆内部电树枝缺陷,表明了该方法有助于提升GIS固体绝缘内部局部放电的检测和定位效果,为检修提供可靠依据。

Comparing with ultrasonic partial discharge detection method, ultra high frequency partial discharge de- tection method detects and locates internal discharge defects of GIS solid insulation with good effect, however, be- cause internal discharge defect position and type can not be confirmed, equipment maintenance strategy according to this is difficult to ensure perfection and accuracy. So, this article research on combined method of ultra high fre- quency partial discharge and X-ray digital imaging defect detection for detecting internal discharge defects of GIS solid insulation, after solid insulation defects are detected and located by ultra high frequency partial discharge de- tection method, defects can be visual confirmed by X-ray digital imaging during equipment maintenance. In 110 kV GIS on-site detection of one 110 kV substation. This method successfully detects the electrical tree defect in the in- sulation rod of disconnector in a live detection of 110 kV GIS in a 110 kV substation, which indicates that the meth- od is helpful to improve the detection and location effect of partial discharge in GIS solid insulation, and provides reliable basis for maintenance.