电流互感器变比对变压器纵联差动保护的影响  

Analysis of the Influence of Current Transformer Ratio on Transformer Longitudinal Differential Protection

作　　者：张伟 刘晓倩 ZHANG Wei;LIU Xiaoqian

机构地区：[1]云南电网有限责任公司昆明供电局,云南昆明650100

出　　处：《电力系统装备》2023年第4期86-88,共3页Electric Power System Equipment

摘　　要：变压器是变电站内的重要设备,通常变压器的主保护为纵联差动保护.纵联差动保护原理简单,动作速度快,可靠性高,但这种保护对于电流互感器二次回路接线的要求也较高.文章通过分析变压器纵联差动保护的计算原理,分析电流互感器的变比对差动电流计算的影响,结合一起工程实例进行验证,说明电流互感器的变比对变压器纵联差动保护的重要性.并在厂站二次设备检修及改造过程中提出了预防措施.Transformer is an important equipment in the substation.Usually,the main protection of transformer is longitudinal differential protection.The protection principle is simple,the action speed is fast,and the reliability is high.However,the protection also has high requirements for the secondary circuit wiring of current transformer.The author analyzes the influence of the transformation ratio of current transformer on the differential current calculation by analyzing the calculation principle of transformer longitudinal differential protection,and verifies it with a project example,Explain the importance of the transformation ratio of current transformer to the transformer longitudinal differential protection.Put forward preventive measures during the maintenance and reconstruction of secondary equipment in the plant.

关 键 词：变压器 纵联差动保护 电流互感器变比 差动电流 

分 类 号：TM73[电气工程—电力系统及自动化]