| 引用本文: | 陈桥平,蔡泽祥,刘为雄,曾耿晖,肖伟强.同杆线路跨线故障对选相元件的影响机理[J].电力自动化设备,2010,(2): |
| .Influence of inter-line fault on phase selection element for parallel lines on same pole[J].Electric Power Automation Equipment,2010,(2): |
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| 摘要: |
| 利用电流分支系数提取跨线故障的故障特征量进行选相机理研究,分析跨线故障对相电流差突变量选相、零/负序电流选相等主流选相元件的影响趋势与边界,以解析表达式定量地研究保护选相的有效性。结合同杆双回线路异名单相跨线故障这种典型故障类型,指出了选相元件在同杆线路跨线故障时的特殊性,即故障发生在正序平衡点以内的近端时能较好选出故障相,故障靠近线路末端时不能准确选出故障相,但通过线路两侧配置分相纵联距离保护可以实施正确选相。同时考虑同杆线路背端电源弱馈的特殊运行方式,指出弱馈侧选相元件不能准确选相,与故障位置无关,其需要专门考虑不受弱馈影响的选相元件。最后,结合广东电网进行实例验证。 |
| 关键词: 同杆线路 跨线故障 选相元件 正序平衡点 弱馈 |
| DOI： |
| 分类号:TM773 |
| 基金项目: |
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| Influence of inter-line fault on phase selection element for parallel lines on same pole |
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CHEN Qiaoping1 CAI Zexiang1 LIU Weixiong2 ZENG Genghui1 3 XIAO Weiqiang1
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| Abstract: |
| The current branch coefficients are used to extract the inter-line fault features for faulty phase selection,the influence tendency and boundary of inter-line fault on the main phase selection elements,such as sudden-change of phase current differential and zero / negative sequence current selection,are analyzed,and the effectiveness of phase selection is researched and expressed quantitatively by analytic expression. For the typical inter-phase fault of double-circuit on same pole,the particularity of its ... |
| Key words: parallel lines inter-line fault phase selection element positive sequence equilibrium point weak power feeder |
