华电技术 ›› 2016, Vol. 38 ›› Issue (12): 6-8.

• 研究与开发 • 上一篇    下一篇

高压变频系统电动机保护方案研究

  

  1. 南京国电南自电网自动化有限公司,南京〓211100
  • 出版日期:2016-12-25 发布日期:2017-02-04

Study on electric motor protection scheme of high voltage variable frequency system

  1. Nanjing SAC Automation Company Limited, Nanjing 211100, China
  • Online:2016-12-25 Published:2017-02-04

摘要:

摘要:针对高压变频电动机改造的特点,采用基于频率跟踪的相量差动和采样值差动的双重判据构成差动保护。介绍了变频电动机保护的配置方案,阐述了过零点检测算法和傅氏算法相结合的频率跟踪方法。对研制的保护装置进行仿真实验,实验结果表明该装置能够在不同频率下对变频电动机提供快速可靠的保护。

关键词:

Abstract:

Abstract:For the characteristics of high voltage variablefrequency electric motor transformation, a differential protection is formed using double criterions of phasor differential and sampled values differential based on frequency tracking. This paper introduces the configuration scheme of variablefrequency electric motor protection, and expounds the frequency tracking method that combining zerocrossing detection algorithm and Fourier algorithm. After that, a simulation experiment of developed protection device is conducted, and the result shows that this device could provide rapid and reliable protection for variablefrequency electric motor under different frequencies.

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