采用同向正序基频分量的双回线故障测距原理  

Fault Locating Method Based on Two-terminal Common Positive Sequence Fundamental Frequency Component for Parallel Transmission Line

作　　者：林富洪[1] 王增平[1] 

机构地区：[1]电力系统保护与动态安全监控教育部重点实验室(华北电力大学),北京市昌平区102206

出　　处：《中国电机工程学报》2011年第4期93-98,共6页Proceedings of the CSEE

基　　金：国家自然科学基金重点项目(50837002)~~

摘　　要：提出一种采用同向正序基频分量的双回线故障定位新原理。该方法基于线路分布参数模型定义了一个双回线定位函数,当参考点在故障点前后变化时,定位函数相位会唯一发生一次阶跃,因此相位阶跃点所对应的位置即为故障发生点。采用分布参数模型使得该方法克服了分布电容的影响;该方法利用定位函数相位阶跃特性进行定位,克服了故障电阻的影响,因此适用于非线性电阻故障且具有良好的快速性;采用同向正序基频分量进行定位,适用于各种双回线故障类型和整个故障期间的定位。PSCAD/EMTDC仿真结果验证了该方法的正确性。A novel parallel transmission line fault location method based on positive sequence fundamental frequency component was proposed. In the method a parallel transmission line fault location function was defined based on distributed parameter transmission line model. The phase of the fault location function will have only one step jump when the reference point changes from the left to the right of the fault. So the position where the fault location function has a step jump is the fault position. The method is immune to the influence of distributed capacitance of transmission lines due to the distributed parameter line model. The method is not influenced by the fault resistance because the phase step jump characteristic of the fault location function was applied to locate the fault, and the method can be applied to nonlinear resistance fault and can locate fault quickly. The method can be used to all types of parallel transmission lines and can locate fault position during the whole period after fault because the positive sequence fundamental frequency component was employed. Simulation results of PSCAD/ EMTDC show that the method is correct.

关 键 词：定位函数 同杆双回线 同向正序基频分量 相位阶跃特性 

分 类 号：TM77[电气工程—电力系统及自动化]