粗糙集理论在IEC-60599三比值故障诊断决策规则中的应用

基于粗糙集理论提出一种改进的新导则IEC三比值的变压器故障诊断决策新方法。文中从实际诊断中出发首次将IEC-60599三比值故障诊断表编写成对应的逻辑编码表，然后应用粗糙集理论构造决策表并对决策表进行约简，最后建立改进的新导则IEC-60599三比值故障诊断决策规则。这种改进的新导则IEC-60599三比值诊断方法使用简单，便于操作。同时它还扩展了IEC-60599三比值的故障诊断范围、提高了故障诊断能力和复合故障的识别能力。在诊断信息不完备的情况下，可以避开遗漏信息实现较为准确的故障诊断。实际诊断结果表明，它的故障诊断正确率比IEC-60599三比值诊断法高达19．7％左右。这种改进的新导则IEC-60599三比值故障诊断决策规则简单实用，便于技术人员的现场使用，在实际工程中具有实用价值。

APPLICATION OF DECISION RULES FOR IEC-60599 THREE-RATIO FAULT DIAGNOSIS BASED ON ROUGH SET THEORY

An improved IEC-60599 three-ratio fault diagnosis technique for power transformer is proposed, which is based on the Rough Set Theory. Firstly, a logical diagnostic table of IEC-60599 is presented, and a decision table can be constructed by applying the Rough Set Theory based on the IEC-60599 three-ratio fault diagnosis table. Then, the reduction of the decision table will be obtained, and an improved new IEC-60599 three-ratio fault diagnosis decision table for transformer fault diagnosis can be acquired. The results of the experiment demonstrate that the improved new IEC-60599 three-ratio fault diagnosis technique extends the coding area of the earlier IEC-60599 three-ratio fault diagnosis technique, the actual malfunction diagnosis ability is proved and fault diagnosis accuracy is higher compared with the earlier IEC-60599 three-ratio diagnosis technique at the incompleteness and complexity of fault diagnosis for power transformer. The method is easily used to engineering technician. All these properties can be applied in practice.