同杆双回线的新型继电保护方案研究

Study of a new relay protection scheme for double-circuit lines on the same pole

指出了分相电流差动作为目前同杆双回线的首选主保护所存在的一系列问题,如通道故障时差动保护就要退出,互感对后备保护的影响等,提出新型的同杆双回线继电保护方案同杆并架双回线采用光纤通道,通道故障失去主保护,通过装置间的通信引入相邻线电流,采用横差解决主保护问题,并利用相邻线电流补偿解决互感对后备保护的影响。

This paper points out the existence of a series of problems about double-circuit lines on the same pole with the main protection of phase segregated current differential protection, such as differential protection will quit when channel is in fault and common reactance＇s impact on back up protection. A new relay protection scheme is introduced in this paper. Double-circuit lines adopt fibre channel. When channel is in fault, transverse differential protection can be used, which introduces adjacent line current, to resolve the problem of differential protection quitting. Common reactance＇s impact on back up protection can also be resolved by adjacent line current compensation.