华电技术 ›› 2017, Vol. 39 ›› Issue (4): 8-10.

• 专题综述 • 上一篇    下一篇

变频电动机差动保护的研究与应用

  

  1. 张延林,王鹏,韩英杰,樊予胜,刘政
  • 出版日期:2017-04-25 发布日期:2017-05-23

A study of differential protection of variablefrequency motor and its applications

  1. 1.Technical Information Center,Henan Company of State Power Investment Corporation,Zhengzhou 450000, China; 2.Henan Company of State Power Investment Corporation,Zhengzhou 450000, China; 3.Kaifeng Branch, Henan Company of State Power Investment Corporation,Kaifeng 475000, China; 4.Jiangsu Wiscom Technology Company Limited,Nanjing 211100,China
  • Online:2017-04-25 Published:2017-05-23

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。

关键词: 高压电动机, 变频器, 频率跟踪, 采样值差动保护

Abstract:

As the application of frequency converter in auxiliary power, the requirements of frequency conversion transformation of highvoltage 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 nonpower 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 highvoltage variablefrequency motor.

Key words: high voltage motor;frequency converter, frequency tracking, sampling value differential protection