一起500kV智能变电站跳闸事故的分析
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摘要
针对一起500k V智能变电站双母双分段中压侧的跳闸事故,扼要简述保护动作情况和动作时序。针对中压侧全停事故,深入分析母线差动保护和主变保护动作的行为,指出智能站中压侧母线及主变的动作条件和机理。通过对比常规站双母双分段之间的失灵回路,提出智能站双母双分段之间的互启失灵、动作原理以及保护与智能终端的配合思路,并对失灵的原因和改进方式进行着重研究。探讨主变与母线差动保护之间失灵联跳回路的原理和条件,分析智能站在联跳及失灵回路和逻辑判别上的差异,指出复压闭锁、过电流判别以及固定延时的改进措施。重点探讨新型智能站CT极性回路的置反情况,结合本次跳闸事故,指出CT极性配置方案和保护动作原理,并根据运行方式提出合理的建议。
This article briefly states protection action and action time sequence in terms of a trip accident at the medium voltage(MV) side of the double-bus dualsubsection of 500 kV intelligent substation. For complete blackout at the MV side, in-depth analysis of the behavior of bus differential protection and main transformer protection action are made, and the action conditions and mechanism of the bus at the MV side and the main transformer at the intelligent substation pointed out. Through comparison of the fault circuits between the double-bus dual-subsection at a conventional substation, mutually actuated failure thinking and action theory between the double-bus dualsubsection of the intelligent substation, and the coordination between protective and intelligent terminals are analyzed in detail, and emphasis is put on the introduction of improvement reason and method of fault links. The theory and conditions of fault intertrip circuit between the main transformer and the bus differential protection are investigated; the difference of the intelligent substation in intertrip, fault circuit and logic judgment analyzed; and the measures for improving compound-voltage blocking, overcurrent judgment and constant time lag put forward. Emphasis is put on the study of the inversion of CT polarity circuit at a new intelligent substation; CT polarity configuration scheme and protection action reason pointed out in combination of the trip accident; and reasonable improvement measures brought up according to the method of operation.
This article briefly states protection action and action time sequence in terms of a trip accident at the medium voltage(MV) side of the double-bus dualsubsection of 500 kV intelligent substation. For complete blackout at the MV side, in-depth analysis of the behavior of bus differential protection and main transformer protection action are made, and the action conditions and mechanism of the bus at the MV side and the main transformer at the intelligent substation pointed out. Through comparison of the fault circuits between the double-bus dual-subsection at a conventional substation, mutually actuated failure thinking and action theory between the double-bus dualsubsection of the intelligent substation, and the coordination between protective and intelligent terminals are analyzed in detail, and emphasis is put on the introduction of improvement reason and method of fault links. The theory and conditions of fault intertrip circuit between the main transformer and the bus differential protection are investigated; the difference of the intelligent substation in intertrip, fault circuit and logic judgment analyzed; and the measures for improving compound-voltage blocking, overcurrent judgment and constant time lag put forward. Emphasis is put on the study of the inversion of CT polarity circuit at a new intelligent substation; CT polarity configuration scheme and protection action reason pointed out in combination of the trip accident; and reasonable improvement measures brought up according to the method of operation.
引文
[1]刘振亚.智能电网技术[M].北京:中国电力出版社,2010:15-23.
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[3]张沛超,高翔.全数字化保护系统的可靠性及元件重要度分析[J].中国电机工程学报,2008,28(1):77-82.Zhang Peichao,Gao Xiang.Analysis of reliability and component importance for all-digital protective systems[J].Proceedings of the CSEE,2008,28(1):77-82.
[4]Kim H M,Lee J J,Kangd J.A platform for smart substations[J].Future Generation Communication and Networking,2007(1):579-582.
[5]赵佰成,徐炜彬,曲绍杰.220 kV典型保护死区问题的探讨[J].电力系统保护与控制,2010,38(13):130-132.Zhao Baicheng,Xu Weibin,Qu Shaojie.Discussionabout the problem of 220 kV typical protection's dead-zone[J].Power System Protection and Control,2010,38(13):130-132.
[6]吴宏斌,何云良.消除变压器盲区故障的继电保护方法[J].电力系统保护与控制,2010,38(1):125-128.Wu Hongbin,He Yunliang.Methods of relay protection on eliminating blind fault of transformer[J].Power System Protection and Control,2010,38(1):125-128.
[7]赵曼勇,舒双焰,赵有铖.高压电网防保护死区电流互感器保护绕组的配置及反措[J].电力系统保护与控制,2010,38(5):132-134.Zhao Manyong,Shu Shuangyan,Zhao Youcheng.Configuration scheme of current transformer coils used by protections and measures against dead zone in high[J].Power System Protection&Control,2010,38(5):132-134.
[8]Jiang Zh,Li Fx,Qiao W,et al.A vision of smart transmission grids[C].PES General Meeting IEEE,2009.
[9]Hoga C,Wong G.IEC 61850:Open Communication in Practice in Substations[C].Power Systems Conference&Exposition,2004.
[2]高翔,张沛超.数字化变电站的主要特征和关键技术[J].电网技术,2006,30(23):67-71.Gao Xiang,Zhang Peichao.Main features and key technologies of digital substation[J].Power System Technology,2006,30(23):67-71.
[3]张沛超,高翔.全数字化保护系统的可靠性及元件重要度分析[J].中国电机工程学报,2008,28(1):77-82.Zhang Peichao,Gao Xiang.Analysis of reliability and component importance for all-digital protective systems[J].Proceedings of the CSEE,2008,28(1):77-82.
[4]Kim H M,Lee J J,Kangd J.A platform for smart substations[J].Future Generation Communication and Networking,2007(1):579-582.
[5]赵佰成,徐炜彬,曲绍杰.220 kV典型保护死区问题的探讨[J].电力系统保护与控制,2010,38(13):130-132.Zhao Baicheng,Xu Weibin,Qu Shaojie.Discussionabout the problem of 220 kV typical protection's dead-zone[J].Power System Protection and Control,2010,38(13):130-132.
[6]吴宏斌,何云良.消除变压器盲区故障的继电保护方法[J].电力系统保护与控制,2010,38(1):125-128.Wu Hongbin,He Yunliang.Methods of relay protection on eliminating blind fault of transformer[J].Power System Protection and Control,2010,38(1):125-128.
[7]赵曼勇,舒双焰,赵有铖.高压电网防保护死区电流互感器保护绕组的配置及反措[J].电力系统保护与控制,2010,38(5):132-134.Zhao Manyong,Shu Shuangyan,Zhao Youcheng.Configuration scheme of current transformer coils used by protections and measures against dead zone in high[J].Power System Protection&Control,2010,38(5):132-134.
[8]Jiang Zh,Li Fx,Qiao W,et al.A vision of smart transmission grids[C].PES General Meeting IEEE,2009.
[9]Hoga C,Wong G.IEC 61850:Open Communication in Practice in Substations[C].Power Systems Conference&Exposition,2004.