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中国电机工程学报 2008, 28(4) 72-77 DOI:
ISSN: 0258-8013 CN: 11-2107/TM |
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| 继电保护、通信及自动化 |
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反应重负荷下高阻故障的稳态量线路差动保护判据 |
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汤俊 王晓茹 |
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西南交通大学电气工程学院 西南交通大学电气工程学院 |
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摘要：
指出传统稳态量差动保护判据受穿越电流影响，导致重负荷接地故障情况下带过渡电阻能力弱，提出一种改进的稳态量电流差动判据，对两种判据灵敏度的理论分析表明，改进判据在内部带电阻接地故障中,具有较高的灵敏度，特别是对重负荷下的高阻接地故障，表现出明显的优越性。根据一条750 kV线路故障和保护的仿真试验，证明该电流差动改进判据较传统稳态量判据，在保证区外故障安全性的基础上，对重负荷状况下的带过渡电阻能力有很大的提高，是一种比较理想的超高压或特高压输电线路电流差动保护判据。 |
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关键词：
电流差动保护
超/特高压
输电线路
故障过渡电阻
穿越电流
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Current Differential Protection Criterion Using Steady Currents for Heavy-load Line With High Fault Resistance |
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TANG Jun WANG Xiao-ru |
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Abstract:
It is analyzed that the criterion of current differential protection using steady currents is not able to operate at internal faults under the condition of high fault resistance and heavy-loads due to through currents. An improved steady current differential protection criterion is proposed. The sensitivities of these two criteria are analytically compared. The improved criterion possesses higher sensitivity at an internal ground fault with fault resistance and is especially superior on the conventional one under the condition of high fault resistance and heavy-loads. Simulation of faults and the two protection criteria on a 750 kV line proves that the proposed criterion has achieved a great improvement on the abilities of detecting high resistance internal faults in the heavy-load condition with guarantee of security at external faults. It is a proper current differential protection criterion for EHV\UHV transmission lines. |
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Keywords:
current differential protection
extra & ultra high voltage
input-output linearization
fault resistance
through current
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收稿日期 2006-09-20 修回日期 1900-01-01 网络版发布日期 |
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DOI: |
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基金项目:
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通讯作者: 汤俊 |
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作者简介: |
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作者Email: tangjun@mars.swjtu.edu.cn |
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| 参考文献： |
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| 本刊中的类似文章 |
| 1．及洪泉 杨以涵 李岩松 高桦.基于光学电流互感器的非周期分量线路纵差保护[J]. 中国电机工程学报, 2007,27(19): 45-49 |
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| Copyright by 中国电机工程学报 |
