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Bo Gao, Rui Yu, Guangcai Hu, Cheng Liu, Xin Zhuang and Peng Zhou
The pressboard surface is the electric weak link of the oil-paper insulation in transformers, and long-term partial discharge (PD) erosion is the dominant cause of degradation in pressboard. To explore the development processes of surface tracking under ...
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Lefeng Cheng, Tao Yu, Guoping Wang, Bo Yang and Lv Zhou
This paper develops a novel dynamic correction method for the reliability assessment of large oil-immersed power transformers. First, with the transformer oil-paper insulation system (TOPIS) as the target of evaluation and the winding hot spot temperatur...
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Chao Tang, Bo Huang, Miao Hao, Zhiqiang Xu, Jian Hao and George Chen
This paper focuses on the space charge behavior in oil-paper insulation systems used in power transformers. It begins with the importance of understanding the space charge behavior in oil-paper insulation systems, followed by the introduction of the puls...
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Wojciech Sikorski, Krzysztof Walczak and Piotr Przybylek
Most power transformers operating in a power system possess oil-paper insulation. A serious defect of this type of insulation, which is associated with long operation time, is an increase in the moisture content. Moisture introduces a number of threats t...
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Yazid Hadjadj, Fethi Meghnefi, Issouf Fofana and Hassan Ezzaidi
Frequency Domain Spectroscopy (FDS) is an effective tool allowing assessing the condition of oil-paper insulation system in power equipment. However, results from these measurements are known to be greatly influenced by various parameters, including ins...
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Weigen Chen, Xi Chen, Shangyi Peng and Jian Li
Dissolved gas analysis (DGA) has been widely applied to diagnose internal faults in transformer insulation systems. However, the accuracy of DGA technique is limited because of the lack of positive correlation of the fault-identifying gases with faults f...
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Ruijin Liao, Fuzhou Zhang, Yuan Yuan, Lijun Yang, Tuan Liu and Chao Tang
SiO2 hollow spheres and low relative permittivity insulation paper handsheets composed of these SiO2 hollow spheres with different weight percentages were successfully prepared. Low-content SiO2 hollow spheres were unifor...
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Youyuan Wang, Senlian Gong and Stanislaw Grzybowski
The overall life of oil-immersed power transformers depends on the long-term life of the oil?paper insulation system throughout continuous operation. Studying the reliability assessment methods for oil?paper insulation can help determine the reliability ...
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