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| 摘要: |
| 提出了一种基于分布参数模型的T型线路非同步故障测距新算法.该方法利用正序电压值判断故障支路,在此基础上,将非故障支路化简合并,得到故障时支接点的等效电气量.再对故障支路利用双端非同步测距算法进行精确测距.该方法将非同步时间和故障距离作为未知数,利用正序和负序分量(不对称故障)、正序和正序故障分量(三相对称故障)建立测距方程组,求出了故障距离的解析表达式,克服了现有的基于分布参数模型的非同步测距算法必须迭代或搜索的缺点,解决了数据不同步带来的测距误差问题.该方法计算量小,适用于各种类型短路,无需选相.ATP-EMTP仿真结果表明该方法正确且精度高,可以耐受很大的过渡电阻,对数据采样率无高的要求. |
| 关键词: 非同步采样 故障定位 T型线路 保护 |
| DOI： |
| 分类号:TM773 |
| 基金项目: |
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| Fault locating algorithm for T-type transmission lines with asynchronous sampling |
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SHI Shihong HE Benteng
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| Abstract: |
| A fault locating algorithm for T - type transmission lines with asynchronous sampling is proposed,which is based on distributed parameter model. It uses positive sequence voltage to identify the faulty branch and simplifies the healthy branches to calculate the equivalent electrical quantities of T point. The fault can be located with two - terminal asynchronous sampling methods. The asynchronous sampling time and fault distance are treated as the unknown variables,which are solved by establishing the fault locating equations using the positive and negative components for asymmetric fault and the healthy and faulty positive components for 3-phase symmetric fault. It does not need iteration and search,and avoids the error caused by asynchronous sampling. It has low computation load and is suitable for all fault types without faulty phase identification. The results of ATP-EMTP-based simulation indicate that,the proposed method has high accuracy even with low sampling rate and large fault transition impedance. |
| Key words: asynchronous sampling,fault locating,T- type transmission lines,protective relaying |
