Field experiences with measurements of dielectric response in frequency domain for power transformer diagnostics
Field experiences with measurements of dielectric response in frequency domain for power transformer diagnostics
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DOI：
10.1109/tpwrd.2005.861231
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发表时间：
2006-03
影响因子：
4.4
通讯作者：
J. Blennow;C. Ekanayake;K. Walczak;B. García;S. Gubanski
中科院分区：
文献类型：
--
作者：
J. Blennow;C. Ekanayake;K. Walczak;B. García;S. Gubanski
国际大电网会议（CIGRE）指出，基于Transformer绝缘的介电响应在时域和频域上的特性，一些新的方法适用于评估纸板和纸张中的含水量。目前市场上可用的测量设备在现场条件下非常坚固;然而，存在不期望的内部和外部因素可能影响测量的风险。这些影响可能导致对绝缘湿度的错误解释。因此，操作人员应了解在不同测量条件下出现的风险以及可采取的预防措施，以尽量减少其影响。本文系统地研究了一些因素对野外介电响应测量结果的影响。在测量过程中，如果不采取某些预防措施，与不同的设备并联连接，可以犯下的错误进行评估。分析了降雨和电磁干扰的影响，提出了减小其影响的解决方案。最后，讨论了温度分布的影响。工作集中在频率响应测量，虽然一些结果从使用极化和去极化电流技术也进行了讨论。
Some new methods, based on characterization of the dielectric response of transformer insulation in time and frequency domains, have been pointed out by CIGRE as suitable to assess moisture content in pressboard and paper. Measuring devices available today on the market are quite robust in field conditions; however there is a risk that undesired internal and external factors might influence the measurements. These influences can lead to mistaken interpretation of insulation wetness. Operators should therefore be aware of the risks appearing at different measuring conditions and of the precautions that can be taken to minimize their effects. This work presents a systematic investigation on the influence of some factors on the results of dielectric response measurements in field conditions. The errors that can be committed during the measurements if certain precautions are not taken, with different equipment connected in parallel, are evaluated. The influence of rain and electromagnetic disturbances are also analyzed proposing solutions to attenuate their effects. Finally, a discussion on the influence of temperature distribution follows. The work is concentrated on frequency response measurements, although some results from the use of polarization and depolarization current technique are also discussed.