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Mechanical Faults in Oil‐Immersed Power Transformers with Disc‐Type Windings Due to External Short Circuit
IEEJ Transactions on Electrical and Electronic Engineering ( IF 1 ) Pub Date : 2021-03-26 , DOI: 10.1002/tee.23328
Satoru Miyazaki 1 , Yoshinobu Mizutani 1 , Michiharu Ichikawa 1
Affiliation  

This study investigated mechanical faults in oil‐immersed power transformers with disc‐type windings. Short‐circuit tests were conducted on eight aged removed transformers. Before the short‐circuit tests, accelerated aging tests were conducted on all the transformers to discuss the life limit of transformers. Six out of eight transformers experienced the internal ground faults. Although the radial electromagnetic force and the tolerance of the insulation paper against it have been mainly focused in discussing the life of the power transformers, the ground faults were triggered by the crush of the pressboard by the axial electromagnetic force. The axial compressive stress applied to the pressboards varies from the transformer to the transformer, depending on the design of the windings. The transformer, whose axial compressive stress was relatively lower, passed the short‐circuit test. However, even for the similar deterioration degree of the pressboard, the transformer, whose axial compressive stress was relatively higher, experienced the ground fault. These results indicate that the axial compressive stress during an external short circuit and deterioration of the pressboard are critical factors that determine the life of transformers with disc‐type windings. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译:

具有盘式绕组的油浸式电力变压器的机械故障是由于外部短路引起的

这项研究调查了具有盘式绕组的油浸式电力变压器的机械故障。在八台老化的拆下的变压器上进行了短路测试。在进行短路测试之前,对所有变压器进行了加速老化测试,以讨论变压器的寿命极限。8台变压器中有6台发生了内部接地故障。尽管径向电磁力和绝缘纸的承受力主要集中在讨论电力变压器的寿命,但接地故障是由轴向电磁力压在压纸板上而引起的。施加到压板的轴向压应力随变压器的不同而变化,具体取决于绕组的设计。变压器,轴向压应力相对较低的材料通过了短路测试。但是,即使压板的劣化程度相似,其轴向压应力相对较高的变压器也发生了接地故障。这些结果表明,外部短路期间的轴向压应力和压板的劣化是决定具有盘式绕组的变压器寿命的关键因素。©2021日本电气工程师学会。由Wiley Periodicals LLC发布。这些结果表明,外部短路期间的轴向压应力和压板的劣化是决定具有盘式绕组的变压器寿命的关键因素。©2021日本电气工程师学会。由Wiley Periodicals LLC发布。这些结果表明,外部短路期间的轴向压应力和压板的劣化是决定具有盘式绕组的变压器寿命的关键因素。©2021日本电气工程师学会。由Wiley Periodicals LLC发布。
更新日期:2021-03-26
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