中国电力 ›› 2014, Vol. 47 ›› Issue (2): 90-93.DOI: 10.11930/j.issn.1004-9649.2014.2.90.3

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电子式互感器在电动机差动保护中的应用

钱利宏1, 王玮1, 王英男2, 任哲2, 金鹏2   

  1. 1. 北京交通大学 电气工程学院,北京 100044;
    2. 沈阳供电公司,辽宁 沈阳 110003
  • 收稿日期:2013-09-08 出版日期:2014-02-28 发布日期:2015-12-18
  • 作者简介:钱利宏(1986-),男,江西上饶人,硕士研究生,从事电力系统继电保护研究。E-mail: kevin_0627@163.com

Application of Electronic Instrument Transformer in Differential Protection of Electromotor

QIAN Li-hong1, WANG Wei1, WANG Ying-nan2, REN Zhe2, JIN Peng2   

  1. 1. College of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China;
    2. Shenyang Power Supply Corporation, Shenyang 110003, China
  • Received:2013-09-08 Online:2014-02-28 Published:2015-12-18

摘要: 通过实际案列分析了电动机差动保护误动作跳闸的原因,对比传统电磁式电流互感器电路的改进方法,指出其存在的缺陷。提出将电子式电流互感器应用到电动机差动保护中,以防止因铁芯饱和而导致的保护误动作。通过实验表明,该方案能有效解决因互感器铁芯磁饱引起保护误动的问题,提高电动机保护的可靠性和安全性。

关键词: 电动机, 差动保护, 磁饱和, 电子式电流互感器

Abstract: The paper analyzes the causes of differential protection malfunction of electromotors through actual cases, elaborates the improved method of the traditional electromagnetic current transformer circuit, and introduces its defects. It is proposed in this paper to apply the electronic current transformer to the electromotor’s differential protection to prevent malfunction of protection caused by core saturation. Experiments show that the proposed scheme can effectively solve the malfunction of protection caused by core saturation, and improve the reliability and safety of electromotor’s protection.

Key words: electromotor, differential protection, magnetic saturation, electronic current transformer

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