广东电网同塔多回线路雷击跳闸影响因素及故障分析  

Influencing Factors of Lightning Outage in Multi-Circuit Transmission Lines on Same Tower in Guangdong Power Grid and Fault Analysis

作　　者：彭向阳 詹清华 周华敏[3] 

机构地区：[1]广东电力科学研究院,广东省广州市510080 [2]佛山供电局,广东省佛山市528000 [3]广东电网公司,广东省广州市510600

出　　处：《电网技术》2012年第3期81-87,共7页Power System Technology

基　　金：广东电网公司科技项目(08093094)的资助

摘　　要：近年来广东地区线路工程用地趋紧,同塔多回线路规模迅速增大,导致多回线路雷击同时跳闸比例显著上升,给电网安全运行带来新的挑战。介绍同塔线路雷击同时跳闸的特点,分析雷击跳闸关键因素的影响,并对典型雷击同时跳闸故障进行电磁暂态复原分析。指出雷电反击是造成同塔线路多回同时跳闸的绝对主因,但强雷暴过程中连续雷电绕击也会导致多回线路同时跳闸,强调应重点防止110、220 kV同塔线路双回雷击同时跳闸。并指出同塔线路反击跳闸受工频电压及相序排列影响较大,雷击同时跳闸较多发生在同名相,且上横担绝缘子距雷击点较近较易发生闪络。In recent years the land supply for power construction projects is decreased increasingly and it makes the planner of UHV/EHV transmission line construction inclined to adopt the structure of multi-circuit transmission lines on the same tower, therefore as the result the proportion of simultaneous lightning outage of multi-circuit transmission lines on the same tower evidently raises, thus the secure operation of power grid is affected. The peculiarity of simultaneous lightning outage occurred in multi-circuit transmission lines on the same tower is presented and the influences of key factors on lightning outage are analyzed, besides, the recovery analysis on electromagnetic transient of typical simultaneous lightning outage fault is performed. Results of recovery analysis show that the main reason leading to simultaneous lightning outage of multi-circuit transmission lines on the same tower is the flashback of lightning, however successive shielding failures lead to simultaneous lightning outage of multi-circuit transmission lines as well. It is emphasized that special attentions should be paid to the prevention of simultaneous lightning outage occurred in 110 kV and 220 kV double circuit transmission lines on the same tower, and it is pointed out that the power frequency voltage and the phase sequence arrangement of transmission lines on the same tower greatly influence the lightning outage caused by flashback; the simultaneous lightning outages often occur in the same phase of multi-circuit transmission lines; and the flashover is prone to occur on the upper cross arm insulator that is closer to the struck point.

关 键 词：输电线路 同塔多回 雷击跳闸率 影响因素 耐 雷水平 故障分析 

分 类 号：TM86[电气工程—高电压与绝缘技术]