在对 GIL 和 GIS 进行现场耐压试验时，因击穿而引发的过电压现象：机理和后果

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Electric Power Systems Research Pub Date : 2024-09-22 DOI:10.1016/j.epsr.2024.111053

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引用次数: 0

摘要

近年来，在中国的 GIL 和 GIS 项目的耐压试验中发现了过电压。过电压可能导致绝缘损坏和无缺陷的二次击穿。分析表明，过电压产生的原因是管道和架空线路之间的波阻抗不连续。它导致反射波和折射波的叠加，从而产生过电压。事实上，除了结构变化外，结构中的分支也会形成波阻抗不连续。例如，与 GIL 不同，GIS 中的许多分支也会造成过电压。过电压实际上是一种普遍现象。基于实际 GIS 结构的分析表明，在现场耐压试验中，过电压可能会超过额定照明冲击电压的峰值，甚至超过 GIS 的绝缘极限。模拟和实验结果验证了这些分析。这种普遍现象严重危及 GIL 和 GIS 在耐压试验期间的安全，因为可能会发生二次击穿。GIS 甚至会变得更加脆弱。因此，应重新考虑现场测试结构或电压。保留所有权利。

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Overvoltage phenomenon initiated by breakdown during on-site withstand voltage tests of GIL and GIS: Mechanisms and consequences

An overvoltage was observed in the withstand voltage tests of GIL and GIS projects in China in recent years. The overvoltage may result in insulation damage and secondary breakdown where there is no defect. The analysis shows that the reason for the overvoltage is the wave impedance discontinuity between the pipeline and the overhead line. It results in the superposition of the reflected and refracted waves, and thus the overvoltage is generated. In fact, in addition to the structural change, the branches in the structure can also form wave impedance discontinuities. For example, unlike GIL, there are many branches in GIS that can also cause the overvoltage. The overvoltage is actually a universal phenomenon. The analyses based on an actual GIS structure show that in on-site withstand voltage tests, the overvoltage may exceed the peak value of the rated lighting impulse voltage, and even the insulation limits of GIS. These analyses are verified by simulation and experiment results. This universal phenomenon seriously endangers the safety of GIL and GIS during the withstand voltage test, because of the possible secondary breakdowns. The GIS will even become more vulnerable. Therefore, the on-site test structures or voltages should be revisited.

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来源期刊

Electric Power Systems Research 工程技术-工程：电子与电气

CiteScore

7.50

自引率

17.90%

发文量

963

审稿时长

3.8 months

期刊介绍： Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview. • Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation. • Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design. • Substation work: equipment design, protection and control systems. • Distribution techniques, equipment development, and smart grids. • The utilization area from energy efficiency to distributed load levelling techniques. • Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.