摘要
在混合直流输电线路各类保护中,行波保护常作为主保护。但是由于行波保护作为单端量保护的一种,也存在误动性高且对高过渡电阻的耐久能力较差的特点。在行波保护的基础上,分析区内外故障的故障电流特性不同,提出一种基于故障电流行波特征的混合直流输电线路纵联方向保护方法。根据故障两侧故障电路突变方向的异同,以此来判断为区内故障或区外故障。算例仿真验证,所提方法在提高线路保护性和过渡电阻耐久能力上具有较好效果。
Traveling wave protection is often used as the main protection in hybrid DC transmission line.However,as a kind of single-terminal protection,traveling wave protection also has the characteristics of high misoperation and poor durability to high transition resistance.Therefore,on the basis of traveling wave protection,this paper analyzes the difference of fault current characteristics inside and outside the zone,and proposes a vertical direction protection method for hybrid DC transmission lines based on fault current characteristics.According to the similarities and differences of the mutation direction of the fault circuit on both sides of the fault,the proposed method can judge the fault as an in-zone fault or an out-of-zone fault.The simulation results show that the proposed method has a good effect on improving the line protection and transition resistance durability.
作者
陈国训
CHEN Guo-xun(State Grid Hubei Electric Power Co.Ltd.DC Company,Yichang 443000,China)
出处
《电气开关》
2024年第5期49-52,56,共5页
Electric Switchgear
关键词
纵联方向保护
混合直流输电
行波保护
故障电流行波
longitudinal direction protection
hybrid DC transmission
traveling wave protection
fault current wave
