高 磊, 胥亚宁. 20Hz注入式定子接地保护在700MW水轮发电机组中的应用[J]. 现代电力, 2010, 27(1): 35-39.
引用本文: 高 磊, 胥亚宁. 20Hz注入式定子接地保护在700MW水轮发电机组中的应用[J]. 现代电力, 2010, 27(1): 35-39.
Gao Lei, Xu Yaning. Application of 20Hz Spoon feeding Stator Grounding Protection in 700MW Water turbine Generator Unit[J]. Modern Electric Power, 2010, 27(1): 35-39.
Citation: Gao Lei, Xu Yaning. Application of 20Hz Spoon feeding Stator Grounding Protection in 700MW Water turbine Generator Unit[J]. Modern Electric Power, 2010, 27(1): 35-39.

20Hz注入式定子接地保护在700MW水轮发电机组中的应用

Application of 20Hz Spoon feeding Stator Grounding Protection in 700MW Water turbine Generator Unit

  • 摘要: 青海拉西瓦水电站作为“西电东送”北通道的骨干电源点, 对西北电网750kV网架起重要的支撑作用, 是实现西北水火电“打捆”送往华北电网的战略性工程。本文通过对常用的3ω定子接地保护和3U0定子接地保护原理的简单介绍, 重点突出了拉西瓦水电站发电机定子接地保护所采用的外加20Hz电源注入式100%定子接地保护, 文中不但详细分析了此保护方式的实现和各配套装置的工作原理, 还通过开机前的保护整组实验和72h试运行, 总结了现场调试注意事项以及整套装置的应用与维护注意事宜, 以此证实此保护原理与三次谐波原理相比, 更具有突出的优势, 例如灵敏度更高、测量范围更大, 且与发电机运行工况无关等。

     

    Abstract: As an essential source part of “Transmission of Electricity from West China to East China”, Laxiwa Power Station in Qinghai plays a vital role in 750kV electric net stand in Northwest China. It is a strategic project that can transmit the power as a whole “package” from electrical network in Northwest China to the network of West China. The principles applied in 3ω stator grounding protection and 3U0 stator grounding protection are introduced. The stator grounding protection of 20Hz disemboguement to 100% stator grounding protection applied in this power station is demonstrated. The grounding protection measures and the working principles of these apparatuses are analyzed. Protection experiments of the whole unit and its test run of 72 hours are carried out before the power station works. The matters concerned in the test run on the locale and in the protection and maintenance of the whole unit device are concluded. Compared with the principle of the triple frequency harmonics, this kind of protection has more advantages. It is more sensitive and covers larger areas in test , and it has nothing to do with the operation of the dynamotors.

     

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