作　　者： ; ; ;

机构地区： 中国南方电网

出　　处： 《电气技术》 2020年第3期125-129,共5页

摘　　要： 本文针对投运12年的缺陷换流变现场长时空载和100%总损耗负载试验,对试验原理、试验设备参数、试验现场实施进行了探究。空载损耗测量结果与出厂值的偏差为+1.24%,无明显变化,换流变铁心无明显缺陷。负载试验过程发现局部热点温升异常情况(局部温度达到92.2℃),检查分析热点原因为顶部箱沿螺栓绝缘套性能下降,在漏磁作用下产生过热。采用加装引流线的方式进行处理,处理后再次开展12h 100%总损耗负载试验,相同位置温度下降至49.7℃,基本消除了热点缺陷。 In this paper,the long-time-no-load test and 100%-total-loss-load test are carried out on a extra high voltage(EHV)converter transformer,which is put into operation for 12 years and is defective.And the test principle,equipment parameters,and on-site implementation are investigated.The measurement result of long-time-no-load is less than 1.3%compared with the factory value,which shows there is no obvious defect in the transformer core.During the 100%-total-loss-load test,the local temperature rise is found abnormally(the local temperature reaches 92.2℃).The reason for the hot spot is that the performance of the top box edge bolt insulation cover is weakened,and overheating is caused by magnetic flux leakage.The installation of a drainage line is used to reduce eddy current loss.After the treatment,12-hour 100%-total-loss-load test is conducted again.The temperature at the same location is reduced to 49.7℃,and the hot spot defect is obviously eliminated.

关 键 词： 换流变 长时空载试验 总损耗负载试验 过热型缺陷

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