Oil-filled electrical equipment abnormality diagnosis system, decision tree generation system, decision tree generation method, and decision tree generation program

摘要

PROBLEM TO BE SOLVED: To provide a decision tree generation system capable of generating a decision tree suitable for oil-filled electrical equipment, a decision tree generation method, a decision tree generation program, and an abnormality diagnosis system of the oil-filled electrical equipment.SOLUTION: A decision tree generation system includes: a case data storage part 31 for storing case data where a plurality of pieces of attribute information X including density information is associated with abnormality rank information; a purpose group setting part 21 for setting each purpose group by grouping each rank of the abnormality rank information to grouping patterns capable of grouping it into a small abnormal group and a large abnormal group; an information gain ratio calculation part 22 for calculating an information gain ratio G(X) based on each purpose group when dividing an aggregation D into a plurality of subsets by using the threshold value of each piece of attribute information X as a reference, correspondingly to the combination of each piece of attribute information and each grouping pattern; and a node generation part 23 for generating a node by using a piece of attribute information and a threshold value corresponding to a maximum information gain ratio as an attribute and a branch threshold value respectively.