华电技术 ›› 2008, Vol. 30 ›› Issue (7): 37-41.

• 技术开发 • 上一篇    下一篇

百万千瓦机组注入式定子接地保护的研究与开发

刘小波,包明磊   

  1. 国电南自凌伊电力自动化有限公司,江苏 南京 210013
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2008-07-25 发布日期:2008-07-25

The Research and Development on Injection Scheme for Stator Ground Protection of 1000 MW Generator

LIU Xiao-bo,BAO Ming-lei   

  1. Guodian Nanzi Lingyi Electric Power Automation CO., Ltd., Nanjing 210013, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2008-07-25 Published:2008-07-25

摘要: 随着单机容量的不断增大,对大型发电机组的继电保护提出了更高的要求。阐述了百万千瓦机组对继电保护尤其是发电机定子接地保护的要求,介绍了常规外加电源注入式定子接地保护,并分析了其在实际应用中的不足。基于常规注入式定子接地保护,提出了基于平衡原理的一套完整的微机发电机定子接地保护方案。该方案考虑了外加电源故障、PT断线、系统谐波等因素对保护的影响,能够可靠的进行发电机定子接地故障的判别。

关键词: 百万千瓦机组, 定子接地保护, 注入电源, 谐波

Abstract: The higher requirements of relay protection for large generator unit have been put forward along with the increment of unit capacity. In this paper the requirements for 1000MW unit relay protection, especially for the generator stator ground protection, were expounded, the conventional stator ground protection of external source injection mode was introduced, and the deficiencies in its application were analyzed. A complete microcomputer protection scheme of stator ground fault based on the balance principle was proposed as an improvement of above protection mode. In the scheme, the influence to protection of external source fault, PT leader breakdown, system harmonic etc. were considered, so the protection device can distinguish reliably the generator stator ground failure.

Key words: 1000MW unit, stator ground protection, injection source, harmonic