Evaluation of 15-420 kV substation lightning arresters after 25 years of service

Proceedings IEEE Southeastcon'99. Technology on the Brink of 2000 (Cat. No.99CH36300) Pub Date : 1999-03-25 DOI:10.1109/SECON.1999.766151

S. Grzybowski, G. Gao

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引用次数: 7

Abstract

Surges caused by lightning and switching overvoltages in power systems continue to be a major loss for electrical utilities and customers. To reduce the losses of power system equipment caused by lightning and switching surges and to improve the reliability of power system operations, it is particularly important to evaluate the lightning arrester performances after some specified years of service. In this paper, some gapped SiC arresters rated from 15 kV to 420 kV have been evaluated after being in service for 25 years. According to ANSI/IEEE Std. C62.1-1984 and IEEE C62.11-1989 standards, power-frequency sparkover voltage, maximum 1.2/50 /spl mu/s lightning impulse sparkover voltage and front-of-wave impulse sparkover voltage have been studied. It is found that some of the tested arresters were still fitting well with the standard requirements, while some of them failed the evaluation. If these arresters are still to be used in power systems, it is a great economical benefit for utilities and customers. At the end of this paper, some failure reasons regarding gapped SiC arresters are discussed.

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15-420千伏变电站避雷器服役25年后的评价

在电力系统中，由雷电和开关过电压引起的浪涌仍然是电力公司和客户的主要损失。为了减少雷电和开关浪涌对电力系统设备造成的损失，提高电力系统运行的可靠性，对使用一定年限后的避雷器性能进行评估就显得尤为重要。本文对一些15kv ~ 420kv的SiC避雷器在服役25年后进行了评价。根据ANSI/IEEE Std. C62.1-1984和IEEE C62.11-1989标准，研究了工频闪络电压、最大1.2/50 /spl mu/s雷电冲击闪络电压和波前冲击闪络电压。结果表明，部分经试验的避雷器仍能很好地满足标准要求，而部分避雷器评价不合格。如果这些避雷器仍然在电力系统中使用，这对公用事业和客户来说是一个巨大的经济效益。最后，讨论了碳化硅间隙避雷器失效的原因。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings IEEE Southeastcon'99. Technology on the Brink of 2000 (Cat. No.99CH36300)

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