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| 变电站内短路电流分流系数影响因素分析 | |
| 引用本文： | 张波,吴锦鹏,肖红,范荣全,朱健,黄晓明.变电站内短路电流分流系数影响因素分析[J].高电压技术,2012,38(3):720-728. |
| 作者姓名： | 张波 吴锦鹏 肖红 范荣全 朱健 黄晓明 |
| 作者单位： | 1. 清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室,北京,100084 2. 四川省电力公司,成都,610041 3. 四川电力超高压建设管理公司,成都,610021 4. 西南电力设计院,成都,610021 |
| 摘 要： | 变电站内发生短路故障时,真正带来安全问题的是入地故障电流,而变压器和架空线路会影响电流分布,因此有必要研究其对分流系数的影响。鉴于此,基于相分量的回路电流法,计算分析了变压器及非故障侧线路对分流系数的重要作用;在此基础上,研究了变压器及变电站相关参数和架空线路相关参数对分流系数的影响;此外,还分析了变电站接地电阻与地电位升的关系。结果表明:变压器及非故障侧线路对电流分布有较大的影响;考虑变压器及非故障侧线路情况下对影响分流系数的因素进行分析,提高了分析结果的工程参考价值;变电站接地电阻的增加虽减小了分流系数,但提高了地电位升。因此,在计算分流系数时应当考虑变压器及非故障侧线路,同时变电站接地降阻是十分必要的。 |
| 关 键 词： | 变电站站内短路 分流系数 相分量模型 回路电流法 变压器 架空线路 地电位升 |
Analysis of Affecting Factors on Fault Shunt Coefficient in Substation |
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| ZHANG Bo,WU Jinpeng,XIAO Hong,FAN Rongquan,ZHU Jian,HUANG Xiaoming.Analysis of Affecting Factors on Fault Shunt Coefficient in Substation[J].High Voltage Engineering,2012,38(3):720-728. | |
| Authors: | ZHANG Bo WU Jinpeng XIAO Hong FAN Rongquan ZHU Jian HUANG Xiaoming |
| Affiliation: | 1.State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering,Tsinghua University,Beijing 100084,China; 2.Sichuan Electric Power Corporation,Chengdu 610041,China; 3.Sichuan Ultra High Voltage Power Grid Construction and Management Corporation,Chengdu 610021,China; 4.Southwest Electric Power Design Institute,Chengdu 610021,China) |
| Abstract: | When a short-circuit fault occurs in a substation,the current diffusing into ground actually causes the safety trouble.It is important to analyze the influences of transformer and transmission line on current distribution and shunt coefficient.We adopted loop current methods based on phase-coordinate model to analyze the influences of the transformer and the transmission lines at non-fault side on current distribution,analyzed the effects of system parameters of transformer and transmission line,and researched the relationship between the grounding impedance and ground potential rise.The results show that the transformer and transmission lines at non-fault side greatly affect the current distribution,and ground potential rises as the grounding impedance increases. |
| Keywords: | short-circuit fault in substation shunt coefficient phase-coordinate model loop current method transformer transmission line ground potential rise |
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