标积制动判据归一化的研究  

Study on the normalization of scalar product restrain criterion

作　　者：张艳霞[1] 张家杭[1] 

机构地区：[1]天津大学智能电网教育部重点实验室,天津300072

出　　处：《电力系统保护与控制》2012年第23期42-46,53,共6页Power System Protection and Control

摘　　要：分析现有分相电流差动保护判据的动作特性,指出了传统原理在保障区内故障灵敏性和区外故障可靠性方面存在的不足。提出了将标积制动判据进行归一化处理得到相应的相角判据,同时辅以自适应系数幅值约束的新型保护判据。新判据提高了差动保护的灵敏性和可靠性。理论分析表明新判据在内部故障的灵敏性和区外故障的可靠性上均优于传统的分相电流差动判据,具有良好的抗高阻能力和抗电流互感器饱和性能。仿真实验验证了新原理的正确性。On the basis of analyzing the operation characteristics of the existing criterion of segregated phase current differential protection, we point out the shortcomings of the reliability of the traditional principle in protecting the internal fault and external fault. We propose a normalized product-restraint criterion to get the phase angle criterion; meanwhile, a new criterion of adaptation coefficient amplitude restraint is applied. Compared to the traditional criterion, the new criterion improves the sensitivity and the security of differential protection. Theoretical analysis shows that the novel principle is superior to traditional principles in ensuring sensitivity of internal fault and reliability of external fault. Besides, the proposed principle also has excellent performance under the condition of high resistance grounding fault and current transformer saturation. Simulation tests show that the proposed principle is valid.

关 键 词：输电线路 分相电流差动 标积制动 归一化 灵敏性 可靠性 

分 类 号：TM773[电气工程—电力系统及自动化]