变压器带电检测定位及跟踪技术的应用

介绍了超声波、特高频、高频电流以及时差定位法等局部放电带电检测原理,利用PDS-T90检测到某110 kV变电站2号主变压器(简称主变)存在局部放电现象,根据特高频与高频电流数据,初步推断放电类型来自高压侧电缆仓部位的绝缘类放电。利用PDS-G1500进行定相分析后,判定放电源存在于高压侧C相电缆仓,再利用特高频精确定位,通过时差分析法确定具体放电位置。考虑该变电站负荷的重要性,不便停电处理,经研究决定加装重症监护系统PDS-G100M,实时跟踪放电强度及增长趋势变化,该技术实现了对变压器的局部放电信号进行跟踪、趋势判断并及时预警,科学制定状态检修方案。结果表明,2号主变局部放电信号稳定,无明显增长趋势,故消除了安全隐患,保证了供电可靠性。

Application of Transformer Live Detection Positioning and Tracking Technology

It introduces the principle of partial discharge electrified detection such as ultrasonic,ultrahigh frequency(UHF),high frequency current and time difference location method.The partial discharge phenomenon of No.2 main transformer in a 110 kV substation is detected by PDS-T90.According to the UHF and high frequency current data,it can initial infer that the discharge type is insulation discharge from the high voltage side cable compartment.PDS-G1500 is used to determine the discharge source in the C-phase cable compartment at the high voltage side after phasing analysis.And then UHF is used to accurately locate the discharge source.The specific discharge location is determined by time difference analysis.Considering the importance of the load in the substation,it is inconvenient to deal with the power outage.After research,it is decided to install the intensive care system PDS-G100M to track the discharge intensity and growth trend in real time.The results show that the partial discharge signal is stable and there is no obvious growth trend.The electrified detection positioning and tracking technology are used to realize the partial discharge signal tracking,trend judgment,timely warning of transformer and they have scientifically formulated the condition maintenance program.The results show that the partial discharge signal of No.2 main transformer is stable without obvious increasing trend.So the hidden danger of safety is eliminated and the reliability of power supply is ensured.