中国电力 ›› 2016, Vol. 49 ›› Issue (5): 20-23.DOI: 10.11930/j.issn.1004-9649.2016.05.020.04

• 安全专栏 • 上一篇    下一篇

大型发电机失磁故障分析

陈寿根,郝巍,王凯   

  1. 中广核工程有限公司,广东深圳518124
  • 收稿日期:2016-02-20 出版日期:2016-05-16 发布日期:2016-05-16
  • 作者简介:陈寿根(1965—),男,江苏苏州人,高级工程师,从事继电保护工作。E-mail: chenshougen@cgnpc.com.cn

Analysis of the Excitation-Loss Fault of a Large Generator

CHEN Shougen, HAO Wei, WANG Kai   

  1. China Nuclear Power Engineering Co., Ltd., Shenzhen 518124, China
  • Received:2016-02-20 Online:2016-05-16 Published:2016-05-16

摘要: 某百万千瓦汽轮发电机辅励磁机故障导致发电机失磁,在失磁保护动作跳开机端断路器的过程中,失步保护动作跳开500 kV断路器使事故范围扩大。根据故障录波数据分析计算出发电机失磁后机端导纳、机端阻抗的轨迹变化,详细分析了事故扩大的根本原因,并提出相应的改进措施以防止类似事故的再次发生。

关键词: 发电机, 失磁, 机端阻抗, 轨迹变化

Abstract: The auxiliary exciter fault of a mega-kilowatt turbo-generator unit caused the loss of excitation, resulting in a set of out of step protection tripping of the 500 kV circuit breaker. Based on the data of the fault oscillograph, the trajectory of the terminal admittance and impedance is calculated. The basic causes for the expansion of the accident is analyzed, and some improvement measures are proposed to prevent similar incidents from happening again.

Key words: generator, loss of excitation, terminal impedance, trajectory

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