变电站局部放电区域检测与精确定位方法研究

A Research on Regional Detection and Precise Location of Partial Discharge in Substations

针对传统局部放电带电检测方法与装置应用于变电站整站检测时,工作量大、效率低、成本高等缺点,基于局部放电特高频检测和多传感器联合检测原理,提出一种先巡检进行区域定位,后精确定位与绝缘诊断的变电站局部放电检测方案。文章对局部放电特高频传感器阵列时差定位算法中时延误差对定位结果的影响进行理论探讨,证实了区域巡检定位算法的合理性与有效性。通过理论研究与变电站现场测试,结果证实该方案与检测系统可有效、快速定位出敞开式变电站全站领域内的外绝缘放电以及离非屏蔽绝缘较近的设备内部放电。局部放电;区域定位;精确定位;超声;

In view of such disadvantages as high workload,low efficiency and high cost in the inspection of the whole substation using traditional PD（ partial discharge） live detection method and device,in the principle of combined UHF and multi-sensor PD detection,this paper presents a substation PD detection solution,whereby a touring detection is made for regional location,before precious location and insulation diagnosis is made. This paper theoretically discusses how time delay error of the time difference location algorithm of UHF PD sensor array affects the location result,and verifies the rationality and validity of the algorithm of regional touring detection location algorithm. The results of the theoretical study and the tests made on the site of the substation verify that this approach and detection system can efficiently and quickly locate the discharge of external insulation in the whole area of an open substation,as well as internal discharge of the equipment close to unshielded insulation.