窄线间距同杆双回线故障的对称分量分析  

Symmetry-component analysis for fault on common-tower double-trensmission line narrow line-to-line distance

作　　者：黄少锋[1] 张海[1] 范新 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]山西省晋中市供电局,山西晋中030600

出　　处：《华北电力大学学报（自然科学版）》2012年第6期40-44,共5页Journal of North China Electric Power University：Natural Science Edition

摘　　要：针对220 kV电网中常见窄线间距同杆双回线的互感参数特征,提出了一种基于双回线互感均值的实用故障分析方法,可以分析计算同杆双回线上的所有单回线短路及跨线故障。利用窄线间距双回线互感均值替代数值彼此差异较小的相间互感和线间互感,进而可将双回线上的任一短路故障简化为一个等效的单回线故障,用对称分量即可解算。避免了使用六序模量进行分析,简化了计算。算例与ATP-EMTP仿真的对比表明,该方法引入的误差合理,能够满足计算分析的需要。新方法基于现场实际,具有物理意义明确,简单实用等特点。On account of the mutual inductance parameter feature of common-tower double-transmission line with nar- row line-to-line distance which is common in 220kV power system, a practical fault analytic approach based on average mutual inductance parameter of parallel lines is proposed. The new approach can deal with both single-circuit-line fault and interline fault on common-tower double-transmission line. Via using the narrow line-to-line distance parallel lines＂ average mutual inductance instead of phase-coupling and line-coupling which have similar values, the fault on double- circuit lines can be simplified to an equivalent fault on a single-circuit line and can be analyzed with symmetric compo- nent method. It makes the analysis easy and simplifies the calculation greatly by avoiding using six-sequence modulus. The comparison of calculation examples to ATP-EMTP simulation shows that the new analytic approach can give credi- ble calculation only with little and reasonable errors. The new approach is based on practice parallel lines, and it has the advantages of having definite physical meaning and simplicity.

关 键 词：同杆并架双回线 单回线故障 跨线故障 故障分析 互感均值 相线 

分 类 号：TM755[电气工程—电力系统及自动化]