摘要
采用频域介电谱法对现场不同电压等级、使用年限的变压器进行实验,并对实验结果的对比进行了探讨。实验结果表明,卡尔费休滴定法和FDS对绝缘纸的测试结果,有很好的一致性;采用介质谱得到的绝缘纸中水分含量,与变压器运行时间、老化程度有良好的相关性,与绝缘纸实际水分含量有很好的一致性;温度对于绝缘纸等极性介质的影响较为复杂;残余电荷对FDS的影响是不明显的,在现场应用中可以忽略其影响;试验接线方面,变压器应与电网隔离;变压器电容式套管末屏的接线情况会影响其相应绕组对地绝缘的测量,建议测量时将套管末屏悬空。
In order to research the application of this method to power grid,this paper uses frequency-domain dielectric spectroscopy to test the transformers with different voltage level and service life,and compares the experimental results. The experimental results show that the test results of insulation paper respectively by Karl Fischer titration method and the FDS,have a good consistency; moisture content in insulation paper using dielectric spectroscopy has good correlation with the transformer running time and aging degree,and has good consistency with the actual water content of insulation paper; the effects of temperature on polar media such as insulating paper are more complex; the effect of residual charge of FDS is not obvious,so negligible in field applicatio; in wiring test,the transformer should be seperated from the power grid; the wiring of transformer capacitive bushing tap will affect the grounding insulation measurement of its corresponding winding,so it is suggested to suspend the bushing tap for measurement.
出处
《华东电力》
北大核心
2014年第12期2926-2932,共7页
East China Electric Power
关键词
油纸绝缘
含水量
介电响应
频域介电谱
oil-paper insulation
moisture content
dielectric response
dielectric spectroscopy
