局部放电是引起电力设备事故或缺陷的主要原因之一,开展局部放电带电检测一直是电力变压器状态评估与故障诊断的有效手段.根据实验室模拟及变电站现场实际工况,从原理、准确性及可靠性等方面讨论了现有局部放电带电检测技术的优缺点,对比分析不同检测技术的现场应用效果,讨论了局部放电联合检测定位技术的原理、影响因素及发展趋势,重点分析了传统"电-声"联合定位法的不足,提出"特高频-超声"及"特高频-光"等联合定位方法的检测原理、步骤、效果及适用范围,为今后现场电力设备局部放电带电检测能更快速准确地定位指出了新的研究方向.
Partial discharge is one of the main reasons causing power equipment fault and defect, and the PD live detection has been an effective method to assess condition and diagnose fault for power trans-former. According to the laboratory simulation and on-site investigation, the advantages and disadvantages of PD live detection methods were analyzed from principle, accuracy, and reliability aspects in this paper, and the on-site application effects of different methods were compared. The principle, influencing factors, and development trend of PD joint detection and location technology were discussed, the deficien-cies of traditional"electromagnetic and acoustic"joint location method were analyzed, and the principle, procedure, result, and application of the"UHF-acoustic"and"UHF-light"joint location method were presented, which provide a new research direction to faster and more accurate location of discharge source for power equipment in the field.
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