连续冲击电流脉冲下避雷器阀片电气性能研究

doi:10.19595/j.cnki.1000-6753.tces.L10052

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Abstract

According to natural lightning observation and artificially triggered lightning observation, most of the ground lightning events contain multiple return strokes. Compared with a single large current pulse, multiple lightning strokes will cause much more serious damage to the power system. However, contrary to the actual situation, the ex-factory inspection test of the MOA is only conducted for a single current impact, at the same time the existing standard only stipulates the ability of the MOA to withstand a single impact even though the MOA is the most important and widely used lightning protection measure in the power system, which has led to frequent accidents in the actual operation of the MOAs that have passed the ex-factory inspection. Therefore, it is very necessary to carry out relevant multiple lightning stroke experiments on lightning arresters.
In this paper, the multi pulse generator platform is used to carry out multi pulse impact tests for ZnO varistors of different sizes from two manufacturers suitablefor 110 kV, 220 kV and 500 kV power systems. In the experiment, by changing the amplitude of multi-impulse current, the time interval between pulses and the number of impulses, the performance of the ZnO varistors under the action of multi pulse current with different parameters was studied; At the same time, the influence of the temperature of ZnO varistors on its electrical performance is also studied.
The results show that there is little difference in the electrical performance of the ZnO varistors at different impact intervals (10ms, 50ms, 100ms), and the heat dissipation of the arrestors at millisecond impact intervals is negligible, which is regarded as an adiabatic process. The amplitude of lightning current and the number of impulse currents have a great influence on the electrical performance of the arrester. The higher the amplitude of the impulse current, the more the number of impulse currents, the more obvious the DC reference voltage decreases, and the residual voltage slightly increases. Temperature is an important factor affecting the performance of the arrester. The higher the temperature, the more serious the deterioration of the performance of the arrester, and the speed of deterioration will be accelerated after being impacted again. There is a significant linear relationship between the temperature rise of the arrester and the ratio of absorbed energy and mass.

Key words： ZnO varistors multiple lightning strike experiment electrical performance temperature

Received: 13 January 2023

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TM863

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	Cai Li
	Tian Ruixin
	Wei Juntao
	Zhou Mi
	Wang Jianguo

Cite this article:

Cai Li,Tian Ruixin,Wei Juntao等. Research on The Electrical Performance of ZnO Varistors Under Multiple Impulse Current Pulse[J]. Transactions of China Electrotechnical Society, 0, (): 145-145.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L10052 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/145

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