Abstract:

It was important to study the decision method of condition maintenance for power transformer to improve its operation safety and reliability. For the problem of qualitative evaluation in current decision method of condition maintenance for power transformer, an intuitionistic linguistic evaluation method was proposed by combining intuitionistic fuzzy sets and linguistic evaluation theory. Firstly, in order to get more complete decision information, the intuitionistic linguistic numbers was introduced to express the degree of certainty and hesitancy of linguistic evaluation information from experts. On this basis, an optimization model was established to determine the index weight based on concept of intuitionistic linguistic entropy and comprehensive consideration of various factors. Then in the proposed method, the intuitionistic binary linguistic operators was used to integrate and calculate the decision information from expert group to sort the scheme. Finally, an example analysis demonstrated that the proposed method can cover more decision information and reduce the loss of process in conversion from qualitative to quantitative, and makes the decision result being more objective, reasonable and comprehensive.

Key words: power transformer, condition-based maintenance, decision-making technique, qualitative index, linguistic evaluation, intuitionistic linguistic set