摘要
距离保护应用于同杆并架双回线时其动作性能受零序互感的影响。通过对同杆并架双回线接地故障时零序电流特点以及零序互感对接地距离保护影响的分析,指出两回线零序电流反向是同杆并架双回线接地距离保护误动的主要原因,根据两回线零序电流反向时,故障线路的零序电流大于非故障线路,提出了一种逻辑判断的零序电流补偿方法。数字仿真的结果表明,该方法提高了同杆并架双回线距离保护的性能。
The performance of conventional distance relay is affected by the mutual coupling which exists in the lines of parallel transmission systems.By analyzing the characteristics of zero-sequence current of parallel transmission lines and its influence on distance relays,it points out that the maloperation of ground distance relays is caused by the reverse of zero-sequence currents in different circuits of parallel transmission lines when faults occurs.In this situation,considering the zero-sequence current in fault circuit line is larger than that of in sound circuit line,a new scheme for ground distance protection is presented by logic comparing the zero-sequence currents to decide if the compensation is adopted or not.Simulations show the scheme can improve the performance of the ground distance relay on parallel transmission lines.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第12期102-106,114,共6页
Power System Protection and Control
关键词
双回线
距离保护
零序互感
零序电流反向
parallel transmission line
distance protection
zero sequence mutual inductance
zero-sequence current reverse
