关于投入负荷限制曲线的问题及其整定值的计算  

Problem about Applying Load Limit Curve and Setting Calculation Thereof

作　　者：朱晓华[1] 张葆红[1] 

机构地区：[1]广东电网公司电力调度通信中心,广东广州510600

出　　处：《广东电力》2010年第3期49-53,共5页Guangdong Electric Power

摘　　要：针对1组较长500kV双回线路距离保护Ⅱ、Ⅲ段定值无法保证足够灵敏度和躲过最小负荷阻抗的问题,提出通过投入线路继电保护装置所提供的负荷限制距离特性曲线的方法来解决,并给出了国内常用的220～500kV线路各型号继电保护装置的负荷限制特性定值和纵联距离测量元件电阻定值的计算方法。在实际运用中,该整定计算方法可以在电网潮流发生大范围转移时保证后备保护不误动作,避免引发连锁反应和扩大电网事故。On account of the fact that Sections II and Ill of the distance protection for a couple of 500 kV double-circuit transmission lines can not be sensitive enough and keep out of the minimum load impedance area at the same time, a solution of using the load limit distance characteristic curve which the protection provides is presented. The computational method is offered for the load limit characteristic setting of various common relay protections for 2204500 kV lines in China and the resistance setting of longitudinal distance measuring element. In actual operation, the setting calculation method can prevent malfunction of backup protection, avoid causing chain reactions and worsening power grid accidents during large-scope transfer of power grid load flow.

关 键 词：继电保护装置 纵联距离测量元件 负荷限制 电网潮流 

分 类 号：TM77[电气工程—电力系统及自动化]