摘要
同塔架设的各回线路之间存在线间互感,对处于不同电压等级下的两个同杆双回线的输电线路进行了故障计算的研究。该故障计算方法基于同杆双回线的六序分量法,首先画出六序分量序网图,同时考虑线间互感的存在,求解各序综合阻抗,在已知各序综合阻抗的基础上,按照六序分量法以及故障的边界条件求出各序故障电流,进而求出各相电流,解决了不同电压等级下,同杆四回线的短路故障计算问题。EMTP仿真值验证了这种故障分析方法的正确性,仿真结果表明,基于六序分量法的不同电压等级的同杆四回线的短路电流计算的误差不超过1%。
Inductance exsits between multi-circuit lines. In this paper, six sequence components method is employed to calculate fault current with mutual inductance between lines being considered and per-unit value being used. Transmission lines with identical voltage grade are decoupled by six sequence components methods. Then, six sequence impedances are calculated and short-circuit fault calculation of four transmission lines is addressed. In particular, for this method, the algorithm to calculate sequence impedance will be different with lines in different voltage grade. The result of EMTP simulation indicates that this analysis method is correct and the calculating error is less than 1%.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第9期6-11,共6页
Power System Protection and Control
关键词
六序分量法
短路故障计算
线间互感影响
不同电压等级
同杆四回线
six sequence components method
short circuit fault calculation
infulence of inductance between lines
different voltage grades
four transmission lines
