华电技术 ›› 2013, Vol. 35 ›› Issue (11): 33-34.

• 研究与开发 • 上一篇    下一篇

扩大单元接线发电机选择性复压过流保护研究

  

  1. (1.国电南京自动化股份有限公司,江苏南京〓210032; 2.南京南瑞继保电气有限公司,江苏南京〓211102)
  • 出版日期:2013-11-25 发布日期:2013-12-30

Research on selective compound voltage overcurrent protection for generators in expanded unit connection

  1. (1.Guodian Nanjing Automation Company Limited, Nanjing 210032, China; 2.Nanjing Narirelays Electric Company Limited, Nanjing 211102, China)
  • Online:2013-11-25 Published:2013-12-30

摘要: 摘要:现有发电机复压过流保护应用于扩大单元接线方式发电机上存在无选择性的不足。基于异步法发电机选择性复压过流保护原理,判断为发电机区内故障时,复压过流保护按整定延时跳闸,判断为区外故障时,复压过流保护在延时定值基础上增加短延时跳闸,有效解决了扩大单元接线发电机复压过流保护的选择性问题。动态模拟试验结果验证了该方案的有效性。

关键词: 关键词:扩大单元接线, 复压过流保护, 异步法TA饱和判据, 选择性

Abstract: Abstract:When the current generator compound voltage overcurrent protection is used for generators in expanded unit connection, it does not possess desired selectivity for failed generator. Based on the principle of asynchronous method selective generator compound voltage overcurrent protection, if the fault is judged as fault inside the generator region, then the compound voltage overcurrent protection will trip at setting delay; and if the fault is judged as fault outside the generator region, then the compound voltage overcurrent protection will trip at setting delay plus a short delay. Thus the selectivity problem of the generator compound voltage overcurrent protection used in expanded unit connection was solved effectively. The availability of the scheme was verified by the result of dynamic simulation experiment.

Key words: Key words:expanded unit connection, compound voltage overcurrent protection, asynchronous method current transformer saturation criteria, selectivity