| 引用本文: | 汤大海,严国平,易 新.220 kV线路距离保护在V ／ X接线牵引变压器短路时的测量阻抗分析[J].电力自动化设备,2013,33(2): |
| TANG Dahai,YAN Guoping,YI Xin.Measured impedance of 220 kV line protection during short circuit of traction transformer with V／ X connection[J].Electric Power Automation Equipment,2013,33(2): |
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| 摘要: |
| 基于V／V接线牵引变压器低压侧短路时短路电流分析，推导出该短路情况下，电源侧变电所220 kV线路距离保护相间阻抗元件和接地阻抗元件的测量阻抗计算式，并根据计算式给出了V／V接线牵引变压器低压侧两相短路和三相短路时的220 kV线路距离保护的最小测量阻抗。对V／X接线牵引变压器的各种短路类型进行了分析，发现只要将牵引变压器等值参数Z变为Z′或Z ″，V／V接线牵引变压器短路时对220 kV 线路距离保护的测量阻抗的分析，同样适用于V／X接线牵引变压器短路情况。通过仿真实验，验证了所推导的测量阻抗计算式的正确性，其适用于V／X接线牵引变压器。最后基于上述理论分析和仿真实验结果，给出了220 kV线路距离保护整定计算公式和注意事项。 |
| 关键词: 220kV线路距离保护 牵引变压器 V／X接线 短路电流 测量阻抗 |
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| Measured impedance of 220 kV line protection during short circuit of traction transformer with V／ X connection |
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TANG Dahai1, YAN Guoping2, YI Xin2
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1.Zhenjiang Power Company，Zhenjiang 212001，China;2.Jiangsu Provincial Power Company，Nanjing 210024，China
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| Abstract: |
| The low voltage side short circuit current of traction transformer with V／V connection is analyzed，based on which，the formulas for calculating the measured impedance of inter-phase impedance element and grounding impedance element of 220 kV line distance protection are deduced. The minimal measured impedances of 220 kV line distance protection are thus calculated for two-phase and three-phase short circuits at low voltage side. Different short circuit kinds of traction transformer with V／X connection are analyzed and it is found that，the measured impedance of 220 kV line distance protection analyzed for the LV-side short circuit current of traction transformer with V／V connection is applicable to that with V／X connection as long as the equivalent parameter Z is replaced by Z′ or Z ″，which is verified by simulative experiment. The formulas for calculating the settings of 220 kV line distance protection are given with notes. |
| Key words: 220 kV line distance protection traction transformer V／X wiring electric short circuit currents measured impedance |
