平行双回线电流平衡保护的仿真研究

平行双回线路电流平衡保护具有不需要通道、不需要PT输入的优点。文章提出了适用于高压平行双回线的电流平衡保护方案，首先仿真分析了基于全量、故障分量、零序分量的电流平衡保护的优缺点，在此基础上提出了利用全量电流和零序电流构成综合启动判据、由故障分量构成选线判据的电流平衡保护方案，该方案较基于全量的电流平衡保护灵敏度高、相继动作区小，而且具有选相功能。

Simulation Research on Current Balance Protection for Double-Circuit Transmission Lines on the Same Tower

Current balance protection included in transverse differential protection is free of communication and the input voltage.A novel scheme of current balance protection suitable to high voltage double-circuit transmission lines on the same tower is put forward.Firstly,by means of simulation the advantages and defects of current balance protection based on phase currents,fault component currents and zero-sequence currents are respectively analyzed;then on this basis,a novel current balance protection is proposed,in which the comprehensive starting criterion is composed of phase currents and zero-sequence currents,and the criterion for faulty line detection is composed of fault component currents.Comparing with current balance protection based on phase currents,the advantages of the proposed current balance protection are: more sensitive,smaller successive action area and possessing the function of faulty line detection.