摘要
特高压线路由于输电距离长、输送容量大、充电功率大,其工频过电压比超高压系统更为严重,但具体计算条件有些仍不够明确。在计算分析单、双回特高压线路工频过电压的基础上,从不同角度对各种工频过电压进行了对比研究,确定了单、双回特高压线路过电压研究中应重点考虑的工频过电压种类,并从原理上给出了解释。研究表明,单回线路应重点考虑单相接地甩负荷过电压,同塔双回线路应重点考虑单回运行方式下单相接地甩负荷过电压和双回无故障甩负荷过电压。
Due to its long transmission distance, high transmission capacity, and high charging power, the power frequency over-voltage level occurred in ultra high voltage （UHV） transmission line is much higher than that occurred in extra high voltage （EHV） transmission line, however the computational conditions for power frequency over-voltage in UHV transmission line are not determinate enough. On the basis of the calculation and analysis of power frequency over-voltage occurred in single-circuit and double-circuit UHV transmission lines, the comparative research on various power frequency over-voltage is performed from different viewpoints and the kinds of power frequency over-voltage, which should be emphatically considered in the research on power frequency over-voltage occurred in single-circuit and double-circuit UHV transmission lines, are decided and corresponding explanations are given in theory. Research results show that as for single-circuit UHV transmission line the over-voltage due to load shedding during single-phase earth fault should be emphatically considered, and as for double-circuit UHV transmission line on the same tower the over-voltage due to load shedding during single-phase earth fault under single-circuit operation mode and the over-voltage due to fault-free load shedding under double-circuit operation mode should emphatically considered.
出处
《电网技术》
EI
CSCD
北大核心
2010年第12期30-35,共6页
Power System Technology
基金
国家重点基础研究发展计划项目(973项目)(2011CB-209405)~~
关键词
特高压输电
工频过电压
同塔双回线路
单相接
地甩负荷过电压
ultra high voltage （UHV） power transmission
power frequency over-voltage
double circuit transmission line on the same tower
load throw-off overvoltage with one-phase fault
