| 引用本文: | 夏经德,索南加乐,张怿宁,王 斌,邵文权,何世恩.基于解耦后输电线路纵向阻抗的改进型纵联保护[J].电力自动化设备,2013,33(12): |
| XIA Jingde,SUONAN Jiale,ZHANG Yining,WANG Bin,SHAO Wenquan,HE Shien.Improved pilot protection based on longitudinal impedance of decoupled transmission line[J].Electric Power Automation Equipment,2013,33(12): |
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| 基于解耦后输电线路纵向阻抗的改进型纵联保护 |
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夏经德1,2, 索南加乐2, 张怿宁2,3, 王 斌2, 邵文权1,2, 何世恩2,4
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1.西安工程大学 电子信息学院，陕西 西安 710048;2.西安交通大学 电气工程学院，陕西 西安 710049;3.中国南方电网超高压输电公司 检修试验中心，广东 广州 510663;4.甘肃省电力公司，甘肃 兰州 730050
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| 摘要: |
| 基于单相模型的纵向阻抗特性，在三相模型上建立一种纵向阻抗的精确解耦算法，从理论上确保了纵向阻抗计算的可靠性，由此提出一种运用故障分量纵向阻抗的改进型输电线路纵联保护。对于外部故障，纵向阻抗等于线路的正序阻抗；对于内部故障，纵向阻抗等于等效系统正序阻抗负的相量和。纵向阻抗不需考虑线路各端电气量的同步采样，所提保护方案具有动作灵敏和性能可靠的优点。分析了系统阻抗和线路电容对纵向阻抗的综合影响，增加了辅助判据，使所提保护方案可以适用于不同的运行环境。仿真结果验证了所提保护原理的正确性。 |
| 关键词: 输电 纵联保护 继电保护 故障分量 纵向阻抗 |
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| 基金项目:国家自然科学基金资助项目（51037005，50877061）；西安工程大学博士科研启动基金项目（BS1206） |
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| Improved pilot protection based on longitudinal impedance of decoupled transmission line |
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XIA Jingde1,2, SUONAN Jiale2, ZHANG Yining2,3, WANG Bin2, SHAO Wenquan1,2, HE Shien2,4
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1.School of Electronic Information，Xi’an Polytechnic University，Xi’an 710048，China;2.School of Electric Engineering，Xi’an Jiaotong University，Xi’an 710049，China;3.Test & Maintenance Center，CSG EHV Power Transmission Company，Guangzhou ５１０６６３，China;4.Gansu Electric Power Company，Lanzhou 730050，China
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| Abstract: |
| Based on the LI（Longitudinal Impedance） characteristic of single-phase model，an accurate decoupling algorithm of LI for three-phase model is proposed，which ensures its theoretical reliability. An improved pilot protection applying the LI of fault component is thus proposed for transmission line. When external fault occurs，its LI is equal to the positive-sequence impedance of line；when internal fault occurs，it is equal to the negative phasor sum of the positive-sequence impedances of equivalent system. The proposed protection scheme has sensitive operation and reliable performance，avoiding the synchronous sampling of electrical variables at each terminal of line. The composite influence of system impedance and line capacitance on LI is analyzed and an auxiliary criterion is added，which makes the proposed protection scheme suitable for various operational environments. Simulative results show its correctness. |
| Key words: electric power transmission pilot protection relay protection fault component longitudinal impedance |
