变频电动机差动保护的研究与应用  

A study of differential protection of variable-frequency motor and its applications

作　　者：张延林 王鹏 韩英杰 樊予胜 刘政[4] 

机构地区：[1]国家电投集团河南公司技术信息中心,郑州450000 [2]国家电投集团河南公司,郑州450000 [3]国家电投集团河南公司开封分公司,河南开封475000 [4]江苏金智科技股份有限公司,南京211100

出　　处：《华电技术》2017年第4期8-10,共3页HUADIAN TECHNOLOGY

摘　　要：随着变频器在厂用电中的应用,高压电动机的变频改造及变频差动保护需求日益增多。以凝结水泵电动机变频改造为例,介绍了差动保护改造方案和所采用的非工频频率跟踪采样值差动算法,并通过试验验证了采样性能及保护可靠性,可为高压变频电动机差动保护改造提供参考。As the application of frequency converter in auxiliary power,the requirements of frequency conversion transformation of high-voltage motors and variable frequency differential protection are increasing.Taking the frequency conversion transformation of condensate pump motor as an example,this paper introduced the transformation scheme of differential protection and the non-power frequency tracking sampling value differential algorithm it adopted,and verified its sampling performance and protection reliability by experiments,which provided a reference for the differential protection transformation of a high-voltage variable-frequency motor.

关 键 词：高压电动机 变频器 频率跟踪 采样值差动保护 

分 类 号：TN773[电子电信—电路与系统]