一种配电网单相接地故障综合选线方法

为了充分利用配电网单相接地故障时的故障信息,以提高选线装置的正确选线率,提出了一种综合选线判据的方法。该法将反映故障稳态分量的选线判据、暂态分量的选线判据和利用外加诊断信号的选线判据有机融合,以变电站母线所带出线为研究论域,各单一选线判据为条件属性,离散化的各故障特征量为条件属性值,形成故障信息表并对其进行论域缩减,最后利用决策规则形成决策表,从决策表的决策属性中找到综合选线结果。仿真验证了该综合选线的优越性。

Earth Fault Line Selection in Distribution System by the Rough Set Theory

In order to make the best use of fault information and to improve accuracy of selecting the faulty line,the criterion by synthesizing many kinds of criteria based on different principles respectively is proposed. The new criterion integrates the criterion based on the steady state component, the criterion based on the transient component and the one based on the additional diagnosis signal.The three kinds of criteria are integrated based on the rough set theory on the validity,which takes the feeders on the busbar as universe,takes the selection criteria as condition attributes and takes the discrete fault characteristic quantity as attribute value.And the fault information is formed.By reducing the universe,the decision table is formed by decision rules,and the faulted feeder is found from the decision attribute of the decision table.The faulted feeder can be identified according to the decision table.The simulation proves its advantages.