摘要
500 kV线路工作电压等级高,在雷击过电压中占有不可忽略的比例。为分析计及工作电压情况下同塔双回线路雷击闪络特性,从而降低双回同跳的风险,结合500 kV福州–可门双回线雷击闪络案例,利用ATP-EMTP程序建立仿真模型,讨论分析了工作电压和相序排列方式对反击耐雷水平及双回同跳风险的影响。结果表明,导线工作电压决定可能发生雷击闪络的相别,若存在多个相别的相电压值相等形成竞争态势,则高度最高的左右回路各一相处于优势而发生反击闪络;双回线路相序排列越对称,两相闪络耐雷水平越低,ABC-BCA的排列方式防雷性能最佳。另外,三相和四相反击闪络的仿真情况也有类似结果。
500 kV transmission line due to a high working voltage is usually suffered from lightning overvoltage. To fig- ure out lightning flashover characteristics of double-transmission-line when considering working voltage, to reduce risks of simultaneous trip-out, we discussed and analyzed influences of working voltage and phase arrangement in the case of lightning trip-out on 500 kV Fuzhou-Kemen line using ATP-EMTP program. It is revealed that working voltage as a fac- tor determines potential flashover phases after strike, and flashover happens in one phase with maximum height in each circuit when several possible phases exist and form a competitive situation. Moreover, phases with more symmetrical ar- rangement will have a lower back striking withstanding level of 2-phase flashover while those with arrangement as ＂ABC-BCA＂ have the best back striking protection performance. Besides, back striking simulation cases for 3-phase and 4-phase flashover get a similar result as for 2-phase.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第9期2923-2930,共8页
High Voltage Engineering
关键词
输电线路
雷击闪络
双回同跳
工作电压
相序排列
电磁暂态仿真
反击耐雷水平
transmission line
lightning flashover
simultaneous trip-out of double-circuit line
working voltage
phasearrangement
EMTP
back striking withstanding level
