OPGW与普通地线构成的双地线系统中单相短路电流分流的计算  

Calculation of Short-Circuit Current Distribution Between OPGW and Ordinary Ground Wire Under Single-Phase Earth Fault Occurred in Transmission System Simultaneously Configuring Both Kinds of Ground Wires

作　　者：许高雄[1] 赵大平[1] 戚力彦[1] 丁慧霞[1] 贾美健[1] 张渝[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2011年第1期229-232,共4页Power System Technology

摘　　要：单相短路电流分布的准确计算对输电系统的安全有重要影响。文中说明了双侧消去法的特点,采用回路法对短路电流分布进行了量化计算和算例验证,将计算结果与双侧消去法的结果进行了比较,讨论了普通地线绝缘间隙不击穿情况下短路电流分布的变化。结果表明:回路法得到的短路电流分布与双侧消去法的结果一致,证明了采用回路法计算的结果是正确的;假定绝缘间隙不击穿时,相应线路段的光纤复合架空地线(optical fiber composite overhead ground wire,OPGW)要承受更大的电流,为实现OPGW与普通地线匹配,降低实际线路成本,绝缘间隙整定时,确保绝缘间隙击穿有重大的现实意义。It is very important for the security of transmission system to accurately calculate the shout-circuit current distribution of single-phase earth fault. The feature of double-sided elimination method is illustrated and the distribution of short-circuit current is quantitatively calculated and verified by loop method, and the calculation results are compared with those by double-sided elimination method, and then the variation of short-circuit current distribution under the condition that the insulation gap of ordinary ground wire is not broken down is discussed. Calculation results show that the short-circuit current distribution by loop method conforms to that by double-sided elimination method, so it is proven that the calculation results by loop method are correct; it is assumed that more portion of short-circuit current will flow through optical fiber composite overhead ground wire （OPGW） in corresponding section of line when insulation gap is not broken down, so it is of significance in practice to ensure reliable breakdown of insulation gap during the setting of insulation gap for making OPGW matching to ordinary ground wire and reducing the construction cost of transmission line.

关 键 词：网孔法 单相短路故障 短路电流分布 光纤复合 架空地线 环路电流 杆塔 

分 类 号：TM713[电气工程—电力系统及自动化] TM77