一例继电保护“误整定”的解决措施  

Solutions on a case of incorrect setting of relay protection

作　　者：王玉锋[1] 杜光明[1] 

机构地区：[1]新疆独山子石化公司乙烯厂电气车间,新疆独山子833600

出　　处：《电力系统保护与控制》2009年第23期172-175,共4页Power System Protection and Control

摘　　要：针对一起某化工厂6kV高压电动机速断保护'误动作'事故,剖析了'误动作'的原因。在深入分析电动机起动特性的基础上,提出了一种可行性短路保护策略,该策略主要凭借F650继电保护装置内部逻辑编程实现。两级无时限速断保护设置后,F650可对电动机的起动和运行短路故障作出灵敏反应,快速动作,将其危害限制在较小程度。该策略已通过了试验测试,并在实际应用中取得了良好的效果。In view of the maloperation incident on one 6kV HV motor in a petrochemical plant, this paper analyzes the technical reasons. Then it proposes a feasible strategy for the short-circuit protection by deep analysis of the motor starting-up characteristics. It is implemented mainly by internal logic programming of the protection device F650. By setting two-stage instantaneous overcurrent protection, F650 can be sensitive to phase-phase short-circuit faults during the starting-up and running. If the innovation has been implemented, the damage will be limited to a less extent by its fast actions. The strategy has passed through the related tests in the laboratory and has achieved good results in practical applications.

关 键 词：高压电动机 起动电流 速断保护 “误动作” “误整定” 继电保护装置 

分 类 号：TM774[电气工程—电力系统及自动化]