摘要
目前电力变压器铁心采用钳形电流表人工进行接地电流测量,由于运行中的变压器周围存在漏磁场,对铁心接地电流的测量结果有一定的影响,测量结果缺乏准确性。针对该问题,提出了双圈电流互感器平衡干扰电流的方法,改变测试电流互感器的结构,通过反向电流平衡漏磁场产生的干扰。经现场试验分析,该方法有效排除了漏磁场的干扰,提高了检测结果的准确性。
Recently, clip-on ammeter is adopted to measure the power transformer core earth current artificially, because the transformer leakage magnetic field exists around the running transformer, which has a certain impact on the measurement results of core earth current, lacking of accuracy of measurement results. Aiming at this problem, the double current transformer to balance interference current is put forward. The method is to change the structure of the testing current transformer, and the interference via the reverse current balance of leakage eliminates the interference results. magnetic field. By the field test analysis, this method effectively of leakage magnetic field, and improve the accuracy of the test
出处
《内蒙古电力技术》
2015年第02S期56-59,共4页
Inner Mongolia Electric Power
关键词
电力变压器
铁心
接地电流测试
漏磁场
transformer
core
grounding current test
leakage magnetic field
