高海拔带电作业间隙操作冲击放电特性及放电电压校正

doi:10.19595/j.cnki.1000-6753.tces.190703

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摘要由于高海拔地区空气间隙放电电压明显低于低海拔地区,导致高海拔带电作业所需安全距离增加。为保障高海拔地区带电作业的顺利开展,该文以750kV同塔双回直线塔为研究对象,分别在海拔为2 000m、3 000m和4 300m地区开展了等电位人员—杆塔间隙以及分裂导线—地电位人员间隙的操作冲击放电试验,分析海拔高度和作业人员姿态对间隙放电特性的影响,并基于试验数据分析现有IEC标准中推荐的m参数法在高海拔地区的适用性,结果表明,现有方法不适用于海拔3 000m以上地区带电作业间隙的放电电压修正。最后基于试验数据提出一种基于改进m参数的操作冲击放电电压修正方法,可用于海拔3 000~4 300m地区带电作业间隙操作冲击放电电压的修正,同时给出了海拔2 000~4 000m地区带电作业最小安全距离参考值。

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	方雅琪
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关键词 ：带电作业间隙, 高海拔, 操作冲击, 放电电压校正

Abstract：Since the air gap discharge voltage in high-altitude areas is significantly lower than that in low-altitude areas, the minimum approach distance required for live working increases. In order to ensure the safety operation of live working in high altitude areas, the switching impulse discharge tests are conducted on 750kV double-circuit tower in areas with altitude of 2 000m, 3 000m and 4 300m, and the discharge characteristics of equipotential worker-tower gap and bundle conductor-ground potential worker gap are obtained. The influences of altitude and worker's posture on the discharge characteristics of live working gaps are analyzed. Based on the test data, the applicability of the m-method recommended by IEC standard is evaluated. The results show that the existing method is not suitable for discharge voltage correction of live working gaps in areas with altitude above 3 000m. Finally, a modified m-method is proposed based on test data, which can be used to correct switching impulse discharge voltage of live working gaps at the altitude of 3 000~4 300m. In addition, the minimum approach distance of live working in areas at the altitude of 2 000~4 000m is determined.

Key words： Live working gaps high altitude switching impulse discharge voltage correction

收稿日期: 2019-06-12

PACS:

TM85

通讯作者: 王力农男,1976年生,教授,博士生导师,研究方向为输电线路外绝缘和输电线路运行维护。E-mail: wangln@whu.edu.cn

作者简介: 方雅琪女,1990年生,博士,研究方向为输电线路外绝缘和带电作业技术。E-mail: fangyq25@163.com

引用本文:

方雅琪, 王力农, 李瑞, 刘凯, 宋斌. 高海拔带电作业间隙操作冲击放电特性及放电电压校正[J]. 电工技术学报, 2020, 35(12): 2681-2688. Fang Yaqi, Wang Linong, Li Rui, Liu Kai, Song Bin. Switching Impulse Flashover Characteristics of Live Working Air Gaps in High Altitude Areas and Discharge Voltage Correction. Transactions of China Electrotechnical Society, 2020, 35(12): 2681-2688.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.190703 https://dgjsxb.ces-transaction.com/CN/Y2020/V35/I12/2681

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