摘要
配电网保护间隙在提高线路跳闸重合率和防止架空绝缘导线雷击断线上,取得了较为显著的效果。但在实验中发现相对于避雷器动作时间,保护间隙动作时间和绝缘子动作时间相差不多。从保护间隙和避雷器动作时间不同出发,在分析保护间隙保护距离时考虑了保护间隙闪络时间对保护间隙保护距离的影响。先通过实验确定绝缘子和保护间隙的伏秒特性曲线,然后利用相交法计算出不同等级雷电过电压下保护间隙和绝缘子动作时间,最后根据保护间隙和绝缘子的动作时间差和雷电波在线路上传播的速度计算出不同等级雷电过电压下保护间隙的保护距离。计算方法可以为保护间隙在工程设计中提供指导。
Distribution network protection gap obtained significant results in improving line tripping coincidence rate and in preventing overhead insulated conductor break in the lightning strike. It is founded in experiments that relative to the arresters operation time, there is little difference between the protective gap operation time and insulator operation time. From difference between the protection gap operating time and arrester operating time, the effect of protection gap flashover time on the protection distance of the protection gap is taken into account in the analysis of the protection distance of protection gap. First the volt-second characteristic curve of the insulator and the protection gap is determined by the experiments, and then the operation time of the protection gap and insulator under different levels of lightning overvohage by using intersect method, and finally the protection distance of the protection gap under different levels of lightning overvohage is calculated according to the operation time difference between protection gap and insulator as well as the propagating speed of the lightning wave on the lines. Guidance can be provided for the protection gap in the engineering design by the calculation method.
出处
《电瓷避雷器》
CAS
北大核心
2012年第5期79-83,86,共6页
Insulators and Surge Arresters
基金
国家自然科学基金资助项目(编号:50677058)
湖南省教育厅项目(编号:C08088)
电力系统安全运行与控制湖南省高校重点实验室基金资助
关键词
保护间隙
伏秒特性
相交法
保护距离
protection gap
volt-second characteristic
intersect method
protection distances
