| 引用本文: | 许 龙,崔艳龙,魏建忠,高仕斌,韩正庆.动车组不分闸过分相时牵引变压器差动保护误动分析[J].电力自动化设备,2013,33(4): |
| XU Long,CUI Yanlong,WEI Jianzhong,GAO Shibin,HAN Zhengqing.Misoperation of traction transformer differential protection when train passes phase-separation with electrical load[J].Electric Power Automation Equipment,2013,33(4): |
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| 摘要: |
| 我国高速铁路动车组在通过电分相时采用地面开关式自动过分相方式。以往的试验统计数据显示，在机车通过电分相时，由于地面开关的切换将产生高达负荷电流6倍的冲击电流。对机车不分闸过分相时冲击电流的产生机理进行了理论分析，指出机车主变压器励磁涌流与负荷电流的叠加是造成冲击电流产生的原因。通过MATLAB／Simulink搭建仿真模型，仿真结果验证了理论分析的正确性。结合仿真试验对牵引变压器差动保护误动原因进行了分析，发现牵引变压器电流互感器饱和是造成的差动保护二次谐波制动失效的原因。 |
| 关键词: 高速铁路 冲击电流 牵引 变压器 差动保护 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（50907055）；四川省科技支撑计划（2011GZ0079） |
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| Misoperation of traction transformer differential protection when train passes phase-separation with electrical load |
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XU Long, CUI Yanlong, WEI Jianzhong, GAO Shibin, HAN Zhengqing
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College of Electrical Engineering，Southwest Jiaotong University，Chengdu 610031，China
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| Abstract: |
| The high-speed railway applies the automatic phase-separation passing mode，which coordinately operates the switches on ground when train passes the phase-separation. Test statistics show that the automatic switching operation generates the impact current 6 times of the load current. The cause of impact current is analyzed，which shows that it is the superposition of the load current and the excitation inrush of train main transformer. The simulation model is established with MATLAB／Simulink and the simulative results prove the validity of theoretical analysis，based on which，the misoperation of traction transformer differential protection is analyzed and the conclusion is that the CT saturation of traction transformer results in the failure of the second harmonic braking of traction transformer differential protection. |
| Key words: high-speed railway impact current electric traction electric transformers differential protection |
