发电电动机励磁绕组匝间短路故障在线监测

发布时间：2018-01-05 04:27

本文关键词：发电电动机励磁绕组匝间短路故障在线监测　出处：《电力自动化设备》2017年03期 　论文类型：期刊论文

【摘要】：通用的励磁绕组匝间短路故障在线监测方法未加分辨地采用定子中性点不平衡电流中的所有分数次谐波分量构成监测量及相应的报警值,可能因报警值较高而对小匝数故障不够灵敏。以江苏宜兴抽水蓄能电站发电电动机为例,计算小匝数励磁绕组匝间短路故障引起的定子中性点不平衡电流并实测正常工况下固有不平衡电流,在此基础上提出了一种改进的在线监测方案,提取由匝间短路引起的不平衡电流中含量较高的3/8次和5/8次谐波电流构成报警值。仿真计算结果表明,对于江苏宜兴抽水蓄能电站发电电动机,改进的在线监测方案能对3%及以上匝比的励磁绕组匝间短路故障发出警报,灵敏性优于通用监测方案。基于所提改进方案的在线监测装置已经成功投运于江苏宜兴抽水蓄能电站4号发电电动机。
[Abstract]:The excitation windings of common fault on-line monitoring method without resolution by using stator neutral unbalance current of all fractional harmonic component measurement and the corresponding alarm value, the alarm value may be due to higher on small number of turns fault is not sensitive enough. In Jiangsu Yixing pumped storage power station motor as an example, short circuit fault caused by stator winding inter turn neutral point number calculation of small turn unbalance current was measured under normal conditions inherent unbalanced current is proposed based on an improved online monitoring scheme, the unbalanced current in the extraction of high content of 3/8 and 5/8 constitute the harmonic current caused by the alarm value of interturn short circuit the simulation results show that, for Jiangsu Yixing pumped storage power station motor on-line monitoring scheme, improved to 3% or more turns of excitation winding turns ratio between the short-circuit fault The alarm is more sensitive than the general monitoring plan. The on-line monitoring device based on the improved scheme has been successfully put into operation at the No. 4 generator motor of Jiangsu Yixing pumped storage power station.

【作者单位】：清华大学电机系电力系统及发电设备控制和仿真国家重点实验室;华东宜兴抽水蓄能有限公司;
【基金】：国家自然科学基金面上项目(51277103)~~
【分类号】：TV736
【正文快照】： 0引言从20世纪90年代开始,我国抽水蓄能电站进入了快速发展时期。与一般水轮发电机相比,抽水蓄能电站的发电电动机运行工况更复杂、运行环境更恶劣。随着机组运行年限的增长,出现过一些发电电动机的事故和故障,其安全稳定问题值得关注[1-3]。比如励磁绕组匝间绝缘在高速、频繁

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