大型调相机内部故障特征及纵向零序电压保护性能分析
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摘要
大型调相机(容量为300 Mvar)实际运行中存在定子绕组匝间短路的可能,不装设匝间短路保护或匝间短路保护性能不完善将是调相机安全运行的严重隐患。文中运用"多回路分析法",对两种冷却方式大型调相机所有实际可能发生的内部故障进行了仿真分析,分析结果表明大型调相机现有主保护配置方案(完全纵差保护+纵向零序电压保护)存在较大的保护死区。进一步分析了纵向零序电压保护不能动作的故障类型,为大型调相机主保护性能的改善提供借鉴。
Large-scale condenser(300 Mvar) has the possibility of stator winding inter-turn short-circuit in practice. It will be a serious hidden danger for the safe operation of the condenser that there is no inter-turn short-circuit protection or the performance of inter-turn short-circuit protection is not perfect. The multi-loop analysis method is used to simulate and analyze all possible internal faults of the large-scale condenser with two different cooling modes. The results show that there is a large dead zone in the existing main protection configuration of the large-scale condenser(complete longitudinal differential protection + longitudinal zero-sequence overvoltage protection). The failure types of longitudinal zero-sequence overvoltage protection is further analyzed, which can provide reference for the performance improvement of the main protection configuration of large-scale condensers.
Large-scale condenser(300 Mvar) has the possibility of stator winding inter-turn short-circuit in practice. It will be a serious hidden danger for the safe operation of the condenser that there is no inter-turn short-circuit protection or the performance of inter-turn short-circuit protection is not perfect. The multi-loop analysis method is used to simulate and analyze all possible internal faults of the large-scale condenser with two different cooling modes. The results show that there is a large dead zone in the existing main protection configuration of the large-scale condenser(complete longitudinal differential protection + longitudinal zero-sequence overvoltage protection). The failure types of longitudinal zero-sequence overvoltage protection is further analyzed, which can provide reference for the performance improvement of the main protection configuration of large-scale condensers.
引文
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[2] 冯复生.大型汽轮发电机定子遗留金属异物故障的特征分析[J].电网技术,2000,24(8):23-26.FENG Fusheng. Feature analysis of fault caused by foreign metallic body left in stator of turbo-generator [J]. Power System Technology, 2000, 24(8): 23-26.
[3] 高波.山东电网300～600 MW汽轮发电机故障分析与反措[C]//中国电机工程学会/电工技术学会大电机专委会大型学术报告会议论文集,1999.GAO Bo. Fault analysis and countermeasures of 300～600 MW turbo-generator in Shandong power grid[C]// Proceedings of Symposium on Large Electrical Machines, CSEE/CES, 1999.
[4] 桂林,王祥珩,王剑,等.大型汽轮发电机绕组同槽同相调查及保护方案定量化设计[J].电力系统自动化,2004,28(17):75-79.GUI Lin, WANG Xiangheng, WANG Jian, et al. Investigation of turn-to-turn fault ratio and quantitative design of main protection configuration scheme for large-sized turbo-generator[J]. Automation of Electric Power Systems, 2004, 28(17): 75-79.
[5] 潘仁秋,何其伟,陈俊.大型调相机的保护配置及其实现[J].江苏电机工程,2011,30(6):45-47.PAN Renqiu, HE Qiwei, CHEN Jun. Implementation of protection configuration for large-scale synchronous compensator[J]. Jiangsu Electrical Engineering, 2011, 30(6): 45-47.
[6] 邹东霞,余锐,聂娟红,等.300 Mvar大型同步调相机的启动及继电保护[J].电力系统保护与控制,2016,44(20):160-164.ZOU Dongxia, YU Rui, NIE Juanhong, et al. SFC start and relay protection of 300 Mvar large synchronous condenser[J]. Power System Protection and Control, 2016, 44(20): 160-164.
[7] 罗凌,李振文,宋兴荣,等.大容量调相机继电保护配置方案研究[J].湖南电力,2016,36(5):26-30.LUO Ling, LI Zhenwen, SONG Xingrong, et al. Study on the relay protection scheme of high capacity synchronous condenser[J]. Hunan Electric Power, 2016, 36(5): 26-30.
[8] 陈俊,李华忠,徐青山,等.基于断口两侧电压相量差的发电机机端断路器非全相保护[J].电力系统自动化,2018,42(21):125-130.DOI:10.7500/AEPS20180116002.CHEN Jun, LI Huazhong, XU Qingshan, et al. Open-phase protection of generator circuit breaker based on voltage phasor differences between two sides of breaking point[J]. Automation of Electric Power Systems, 2018, 42(21): 125-130.DOI: 10.7500/AEPS20180116002.
[9] 王维俭.电气主设备继电保护原理与应用[M].2版.北京:中国电力出版社,2002.WANG Weijian. Principle and application of relay protection for electrical main equipment[M]. 2nd ed. Beijing: China Electric Power Press, 2002.
[10] 高景德,王祥珩,李发海.交流电机及其系统的分析[M].2版.北京:清华大学出版社,2005.GAO Jingde, WANG Xiangheng, LI Fahai. Analysis of AC machine and its system[M]. 2nd ed. Beijing: Tsinghua University Press, 2005.
[11] 桂林.大型发电机主保护配置方案优化设计的研究[D].北京:清华大学,2003.GUI Lin. Research on optimal design of main protection configuration scheme for large generator[D]. Beijing: Tsinghua University, 2003.
[12] 李玉海,李久红,张小庆,等.纵向零序电压型发电机匝间保护几个问题[J].电力自动化设备,2001,21(10):62-66.LI Yuhai, LI Jiuhong, ZHANG Xiaoqing, et al. Problems in voltage-type longitudinal zero-sequence inter-turn protection for generator[J]. Electric Power Automation Equipment, 2001, 21(10): 62-66.
[13] 傅自清,陈文学.大型汽轮发电机定子匝间保护及中性点引出方式探讨[J].电力系统自动化,2000,24(10):63-66.FU Ziqing, CHEN Wenxue. Discussion on way of connection to neutral point and turn-to-turn fault protection for stator winding of large turbo-generator[J]. Automation of Electric Power Systems, 2000, 24(10): 63-66.
[14] 桂林,王祥珩,孙宇光,等.大型汽轮发电机新型中性点引出方式的研究[J].电力系统自动化,2006,30(1):56-59.GUI Lin, WANG Xiangheng, SUN Yuguang, et al. Study on new leading-out mode of neutral points of large turbo-generator[J]. Automation of Electric Power Systems, 2006, 30(1): 56-59.
[15] 王祥珩,桂林,王维俭,等.1 000 MW汽轮发电机主保护及中性点引出方式设计研究[J].电力设备,2008,9(1):1-4.WANG Xiangheng, GUI Lin, WANG Weijian, et al. Design and research of main protection and neutral lead mode for 1 000 MW turbo-generator[J]. Electric Equipment, 2008, 9(1): 1-4.
[16] 阎嫦玲,王耀,罗苏南,等.用于发电机保护的柔性全光纤电流互感器[J].电力自动化设备,2017,37(4):191-196.YAN Changling, WANG Yao, LUO Sunan, et al. FFOCT for generator protection[J]. Electric Power Automation Equipment, 2017, 37(4): 191-196.
[17] GUO Weina, HUANG Wenjie. Optical current transformer accuracy problems and solutions[C]// 2010 Asia-Pacific Conference on Power Electronics and Design, May 30-31, 2010, Wuhan, China: 47-50.
[18] 桂林,赵志强,黄欢,等.犍为发电机选择性定子接地保护方案研究[C]//中国电机工程学会大电机专委会大型学术报告会议论文集,银川,2017.GUI Lin, ZHAO Zhiqiang, HUANG Huan, et al. Study on selective stator grounding protection for Qianwei generator[C]// Symposium on Large Electrical Machines, CSEE, Yinchuan, 2017.