基于同步相量测量的同杆双回路继电保护方案的研究

所提出的基于同步相量测量的同杆双回线路保护方案通过相模转换对同杆双回线进行解耦,消除了线间互感对保护的不利影响。并从分布参数线路的相关理论出发,推导出了模量形式的保护判据,从原理上消除了线路参数分布性对保护的影响。该方案通过在模域中检测故障来实现保护,可对同杆双回线路的各种故障作出正确、快速的反应,同时还能提供相应的故障测距信息。对保护动作特性的分析证明了所提出保护方案的可行性。EMTP仿真结果表明该保护方案的可靠性和灵敏度较高、几乎不受过渡电阻的影响,且故障测距结果比较精确。

Protection scheme for double-line with same pole based on synchronized phasor measurement

A protection scheme for DLSP(Double-Line on Same Pole) based on the synchronized phasor measurement is provided,in which the effect of mutual inductance between two lines on protection is eliminated by decoupling using phase-mode transformation.The criterion of protection is deduced in mode-domain using the theory of line with distributed parameters to eliminate the effect of line parameter distribution on protection.Different faults of DLSP can be detected exactly and rapidly by fault detection in mode-domain,and the fault location information is provided as well.The operating characteristic analysis indicates this protection scheme is feasible.Simulation with EMTP shows its high reliability and sensitivity.It is nearly impervious to fault path resistance and has better fault locating accuracy.