| 引用本文: | 张新慧,薛永端,潘贞存,徐丙垠,魏佩瑜.单相接地故障零模暂态特征的仿真分析[J].电力自动化设备,2007,27(12):39-43 |
| .Simulative analysis of zero modal transient characteristics for single-phase grouding fault[J].Electric Power Automation Equipment,2007,27(12):39-43 |
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| 摘要: |
| 提出了一种基于线路分布参数的小电流接地系统的高精度故障模型,用于分析单相接地故障产生的暂态信号特征及进一步完善基于暂态信息的小电流接地故障选线判据。该模型采用一带有6回10kV架空出线的110kV变电所,利用电磁暂态程序EMTP对不同的故障情况进行了全面的仿真和分析。通过分析仿真数据,得到了如下主要故障暂态特征:特征频带(SFB)内,所有健全线路阻抗和故障线路检测的背后阻抗均呈容性;暂态零模电流频率较为集中,主谐振频率位于SFB内;特征频带内,故障线路零模电流幅值比健全线路大,且极性相反。对由于中性点装设消弧线圈、过渡电阻不同、故障点位置不同以及故障初始角不同对故障暂态的幅值特征和相位特征产生的影响也一并做了讨论。 |
| 关键词: 小电流接地系统,单相接地故障,EMTP仿真,零模暂态特征 |
| DOI： |
| 分类号:TM771 |
| 基金项目: |
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| Simulative analysis of zero modal transient characteristics for single-phase grouding fault |
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ZHANG Xin-hui XUE Yong-duan PAN Zhen-cun XU Bing-yin WEI Pei-yu
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| Abstract: |
| A more accurate fault model based on the distributed parameters of non-solidly grounded system is presented to analyze the transient characteristics of single-phase grounding fault and to improve the faulty feeder selection criterion based on transient signals.A 110 kV-substation with six 10 kV overhead lines is modeled,based on which the transient characteristics of different faults are simulated with Electro-Magnetic Transient Program.The analysis of simulative results shows the following characteristics of transient signals:in the SFB(Special Frequency Band),the impedance of all healthy lines and the detected backside impedance of faulty line are all capacitive;the frequencies of transient zero modal currents are concentrated and the main resonant frequency is within the SFB;in the SFB,the magnitude of zero modal current of faulty line is larger than that of healthy line while the polarity is opposite.The influence of Petersen coil,transition resistance,location of fault and initial fault phase angle on the transient characteristics of fault current amplitude and phase are also discussed. |
| Key words: non-solidly grounded system,single-phase grounding fault,EMTP simulation,zero modal transient characteristics |
