选择性Powerformer定子单相接地保护方案

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Abstract In order to resolve the selective protection for Powerformer with more than one generator directly connecting a bus, the characteristics of the stator winding phase-to-ground zero-sequence current (zero-sequence fundamental component and third-harmonic fault component) are analyzed in this paper. Through comparing the direction of zero-sequence currents, magnitude of zero-sequence currents, and fault point energy dissipation, the stator grounding faults can be detected occurred in generator stator winding or not. Simulation results show that the fundamental component and the third-harmonic fault component of leakage current are combined to realize 100% coverage of fault detection for the stator windings of powerformer. What’s more, the protection can distinguish the single-phase earthed fault occurred in stator winding or outside of generator, and can detect stator ground faults in which generator with high sensitivity and selectivity.

Key words： powerformer stator winding single-phase grounding fault zero-sequence current selectivity

Received: 26 June 2014 Published: 23 January 2014

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	Articles by authors
	Wang Yuanyuan
	Yang Bolin
	Long Lihong

Cite this article:

Wang Yuanyuan,Yang Bolin,Long Lihong. Stator Winding Single-Phase Grounding Faults Protection Scheme for Powerformer with Selectivity[J]. Electrical Engineering, 2013, 14(11): 69-73.

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http://dqjs.cesmedia.cn/EN/Y2013/V14/I11/69

[1] LEIJON M, GERTMAR L, FRANK H, MARTINSSON J, KARLSSON T, JOHANSSON B, ISAKSSON K and WOLLSTROM U. Breaking conventions in electrical power plants[M]. in Proc. CIGRE Session, Paris, Aug. 30–Sept. 5, 1998.
[2] JOHANSSON S G, LARSSON B. Short-circuit tests on a high-voltage, cable-wound hydropower generator[J]. IEEE Transactions on Energy Conversion, 19(1), March, 2004:28-33.
[3] 林湘宁, 田庆．Powerformer继电保护系统研究动态[J].电力系统自动化, 2005, 29(8):5-9．
[4] 刘天璋, 吴新振.并联补偿电容对自励异步发电机运行性能的影响[J].电网技术, 2005, 29(6):53-57．
[5] 王祥珩, 孙宇光, 桂林, 等.大型水轮发电机多回路模型的合理简化[J].中国电机工程学报, 2007, 27(3):63-67．
[6] TAI N L, YIN X G, CHEN D S．Analysis of stator ground protection schemes for hydro-generator of Three Gorges Power Plant based on zero sequence voltage[C]．IEEE Winter Meeting, Singapore, 2000．
[7] 毕大强, 王祥珩, 王维俭.基于3次谐波电压故障暂态分量的定子单相接地保护[J].电力系统自动化, 2003, 27(13):45-49.
[8] 黄少锋, 孙鹏, 王增平, 等.基于三次谐波相角突变原理的发电机定子接地保护[J].电网技术, 2000, 24(12):70-73.
[9] RIFAAT R M．Utilizing third harmonic 100% stator ground fault protection, a cogeneration experience[C]. Industry Applications Conference, Canada, 2000.
[10] FULCZYK M. Voltage 3rd harmonic in generator stator winding at changes in generator load conditions[C]. Electric Machines and Drives Conference, Poland, 2003.
[11] 毕大强, 王祥珩, 余高旺, 等．高准确度外加20Hz电源定子单相接地保护的研制[J].电力系统自动化, 2004, 28(16):75-78.
[12] 曾祥君, 尹项根, 陈德树, 等．注入信号法补偿式高灵敏度发电机定子接地保护[J].中国电机工程学报, 2000, 20(11):51-55, 61.
[13] 张琦雪, 王祥珩, 王维俭.大型水轮发电机定子中性点高阻接地暂态分析[J].电网技术, 2004, 28(1):30-33, 37.
[14] 高艳, 林湘宁, 刘沛．Powerformer定子单相接地保护研究[J]．电力系统自动化, 2008, 32(7):63-68.
[15] 穆大庆, 尹项根.中小型水电站中发电机定子单相接地保护原理的探讨[J].继电器, 2005, 33(22):10-15.
[16] 曾祥君, 王媛媛, 龙立宏, 等.选择性发电机定子单相接地保护方法[J].电力自动化设备, 2008, 28(5):34-37, 46.
[17] 田庆. Powerformer故障仿真、保护及相关的电力系统稳定问题[D].武汉:华中科技大学, 2006.