基于Rough set理论的改进三比值故障诊断方法

本文提出一种基于粗糙集理论的三比值电力变压器故障诊断法.文中首先从IEC三比值诊断表出发,应用粗糙集理论构造决策表,然后对决策表进行约简,最后获得变压器故障三比值诊断决策表.实验结果表明,这种改进的三比值诊断方法扩展了原始IEC三比值的编码范围,提高了实际故障诊断能力,它的正确诊断率比IEC三比值诊断法较高,在实际工程中具有应用价值.

An improved three-ratio fault diagnosis based on rough set theory for power transformer

The aim of this paper is to introduce an improved three-ratio fault diagnosis technique for power transformer, which is based on the Rough Set Theory. At first, a decision table can be constructed by applying the Rough Set Theory based on the IEC three-ratio fault diagnosis table. Then, the reduction of the decision table will be obtained, and a new three-ratio fault diagnosis decision table for transformer fault diagnosis can be acquired. The results of the experiment demonstrate that the improved three-ratio fault diagnosis technique extends the coding area of the earlier IEC three-ratio fault diagnosis technique, the actual malfunction diagnosis ability is proved and its diagnosis accuracy is higher as compared with the IEC three-ratio diagnosis technique. All these properties can be applied in practical projects.