摘要
地线系统短路电流的准确计算对光纤复合架空地线(optical fiber composite overhead ground wire,OPGW)热容量的校验及地线的选型有重要意义。OPGW在地线系统的广泛应用,尤其是为降低地线系统损耗而出现的新地线接线方式,如分段绝缘、换位及开环等,使得地线系统的接线变得较为复杂。通过建立复杂地线系统的电路计算模型,较方便地计算出交流输电线路在单相短路状况下的各种指标。数值算例验证了所提方法计算单相对地短路电流的准确性,并且研究了不同特高压地线接线系统在不同单相短路状况下的短路电流分布特征。结果表明,新的复杂地线接线系统对OPGW的选型要求更高,且需额外考虑普通地线的绝缘配合问题。
Accurate calculation of fault current is the foundation of thermostability verification of OPGW and selection of ground wires. The widely application of OPGW, especially the new technologies of ground connection modes, such as graded insulation, transposition and open loop, which are designed to reduce the ground electromagnetic induction power loss, make the ground system more complex. On the basis of phase coordinate model, a method of large scale circuits is proposed to compute the single phase short-circuit in complex ground system conveniently. Numerical examples demonstrate the presented methods are feasible and effective, and the single phase short-circuit distribution characteristic of UHV AC transmission lines under different ground systems is analyzed in detail, supplying beneficial references in electric power construction.
出处
《电网技术》
EI
CSCD
北大核心
2011年第10期16-21,共6页
Power System Technology
关键词
交流特高压
光纤复合架空地线
地线系统
单相短路电流
UHV AC
optical fiber composite overhead ground wire （OPGW）
ground system
single phase short- circuit current
