基于粗糙集理论的小电流接地故障选线方法有效域的研究

小电流接地系统的各种故障选线方法都有其适用范围,即有效域,确定选线方法的有效域是实现多种方法智能融合的前提条件.为此,文章提出应用粗糙集理论对故障样本集进行数据挖掘和知识发现来确定选线方法的有效域.该方法以决策表为主要工具,对故障样本数据进行离散化处理,对冗余信息进行知识约简,最终获得故障信号特征与选线方法间的决策规则;通过概率的表达形式对不协调决策规则进行有效处理.现场实际故障录波数据证明了该方法的正确性.

EFFECTIVE DOMAIN OF FAULTY LINE DETECTION IN SMALL CURRENT GROUNDING SYSTEM BASED ON ROUGH SET THEORY

Various faulty line detection methods for small current grounding system possess respective ranges of application, namely, the effective domain, so the determination of effective domain of faulty line detection methods is the premise to intelligently merge these methods. For this purpose, an approach is put forward to use rough set theory to conduct the data mining and knowledge discovery of fault sample set to determine the effective domain of faulty line detection methods. Taking the decision table as main tool, the fault sample data are discretized and the knowledge of redundant information is reduced, at last the decision-making rules between the features of fault signals and the line detection are obtained. This method can effectively deal with the incoordinational decision-making rules by use of probabilistic expression. The on-site recorded fault data prove the correctness of this method.