同杆并架双回线路行波差动保护  

Traveling-wave Differential Relay Scheme for Double-circuit Parallel Lines on the Same Pole

作　　者：张武军 何奔腾[2] 洪光辉[3] 饶玉凡[4] 

机构地区：[1]湖南省电力勘测设计院,湖南省长沙市410007 [2]浙江大学电气工程学院,浙江省杭州市310027 [3]广东省电力设计研究院,广东省广州市510600 [4]湖南省电力公司中心培训部,湖南省长沙市410131

出　　处：《电力系统自动化》2008年第17期66-71,共6页Automation of Electric Power Systems

摘　　要：同杆并架双回线两回路间存在耦合,基于解耦变换,推导了行波差动保护应用于同杆双回线的差流表达式,详细分析了区内简单故障与跨线故障时两回路的各相差流特征,研究表明,同杆双回线中区内金属性故障时,由于波速不一致,在健全相引起的不平衡差流较相同长度的单回线更严重,为此提出了相应的措施,给出了行波差动保护在同杆双回线路中的实用方案。EMTP仿真验证表明,该方案灵敏度高,动作速度快,能在现有光纤通道基础上实现,具有较高的实用价值。Most of the double-circuit lines on the same pole are not transposed continuously, which may cause interline coupling. Based on the decoupling transformation, a differential current expression is described for double-circuit line, and the differential current characteristics of all the phases are analyzed for both in-zone simple faults and inter-line faults. It is shown that the unbalanced differential current of the non-fault phase for the double-circuit line is larger than that for the single-circuit line. Therefore, a countermeasure is taken, and a practical protection scheme for the double-circuit line is presented which can be implemented on the basis of the fiber-optic channel available for the fast and sensitive operation provided while avoiding maloperation during external faults and in unloaded switching conditions. The results of simulation corroborate the applicability of the scheme.

关 键 词：行波差动保护 同杆双回线 不平衡差流 跨线故障 继电保护 

分 类 号：TM773[电气工程—电力系统及自动化]