The new developed Health Index for transformer condition assessment

Abstract

Health Index (HI) technique is useful for maintenance strategy planning of transformers utilized in industrial sectors and electrical power systems. The conventional HI method requires many testing parameters to evaluate the transformer conditions. Therefore, it may lead to be an impractical task in many reality cases. Besides, some required testing parameters are not clearly defined. The aim of this paper is to represent the new method to assess the conditions of transformers by applying a new developed HI table which was improved from the conventional HI table. The new developed HI table needs only some simple testing parameters for evaluating the transformer conditions. Thirteen transformer case studies were used to evaluate the performance of the new develop HI table by comparing the score value obtained from the conventional HI table and the new developed HI table. The test results show that only 7% different score obtained from the developed HI table compared with conventional HI table. Therefore, the new developed HI technique should be useful for condition analysis of the transformers and also for transformer strategy planning. Applying the new HI technique could reduce the operation cost and adapt well for practical work.