110kV链式电网方式下的纵联备自投逻辑及策略分析

Logic and Strategy Analysis of the Longitudinal BZT in 110 kV Chain Power Grid

对于110kV链式电网方式,常规备用电源自动投入装置仅能实现开环点变电站在失电时的备用电源自投功能,而处于闭环点的变电站失电时无法实现备用电源自投。为解决此问题,利用纵联通道对两侧变电站对应的开关位置、线路电压电流及母线电压等模拟状态量进行快速、可靠地信息交换,进而实现110kV链式电网接线下的备用电源协同工作的纵联远方备自投装置应运而生。重点分析了链式电网接线的3种典型方式下的纵联远方备自投装置的动作逻辑及判断策略,为纵联远方备自投装置在佛山110kV电网的本地化推广应用提供了积极参考,同时为保护厂家提供了较为完善和可靠的系统功能设计建议。目前,110kV纵联备自投装置已在佛山电网110kV部分变电站试点运行,实际应用效果及推广前景良好。

For the 110 kV chain power grid, conventional spare power automatic device can only achieve cast from the backup power source in the loss of power when the open loop in the point of substation, but the substation in the point of close loop can＇t realize the standby power supply automatic switching. To solve this problem, information exchange of the corresponding switch position, line voltage and current and busbar voltage analog state quantities are used to realize the spare power automatic device work together in 110 kV Chain Power Grid, and the longitudinal BZT emerged. Focus on the analysis of three typical chain power grid under the longitudinal distance standby logic and judgment strategies, and longitu- dinal BZT device provides positive reference in localized 110 kV application in Foshan power grid. Provide suggestions for a more perfect and reliable design of system function to the relay protection manufacturers. Currently,the longitudinal BZT in 110 kV Chain Power Grid has been run in part of 110 kV substation in Foshan, and it has a good practical application and promotion.