In planned corrective maintenance, correction of faults is carried out in a planned manner. Among various types of maintenance techniques, based on usage, it is divided into four types, which are corrective maintenance, preventive maintenance, predictive maintenance, and proactive maintenance .Ĭorrective maintenance is divided into two types, namely planned corrective maintenance and unplanned corrective maintenance. Maintenance should reduce the failures in transformers and make them available as maximum as possible. Maintenance is a planned activity that ensures reliable operation of transformers and industrial practises.
This kind of monitoring and maintenance is useful to detect early sign of faults, avoid outages and improve the lifespan of transformers. Therefore, transformers should be monitored closely, and continuous diagnosis has to be carried out to assess their conditions and ensure the maximum lifetime. If the transformer unexpectedly failed, it leads to considerable revenue loss to the utility, environmental damage, an explosion of fire hazards, and involves more money and time for repairing and replacement. Subsequently, increased acid contents degrade the performance of the liquid insulation and the transformer. Transformers are reliable however, if a transformer is subjected to various stresses such as electrical, thermal, mechanical, and chemical thereby, chemical instability occurs, and acid contents are evolved as by-products of oxidation process . Transformers are the most important part of all these areas because it is the most capital equipment to the power industry. The power industries are divided into three major functional areas including generation, transmission, and distribution. relative closeness to the ideal solution.Euclidean distance from the ath alternative to a negative ideal solution.Euclidean distance from the ath alternative to a positive ideal solution.relative normalised weights of the criteria.It is proved that decisions yielded by both methods are in agreement with reality. From the results, transformers with good insulation condition are ranked at top, while the transformers are given lower ranks if they are found to have bad health. Here, data of 69 in-service and 12 failed transformers in Tamil Nadu state in India is collected for assessment. The AHP method is used for weight calculation, and then transformers are ranked using TOPSIS. AHP is exercised for both priority weight calculation and ranking of transformers. In this study, analytical hierarchy process (AHP) and technique for order preference by similarity to ideal solutions (TOPSISs) are used as the multi-criteria decision support methodologies to provide a simple approach to rank transformers based on their mineral oil data and to help decision makers to identify the transformer, which is in the most critical state. The evaluation and selection of state of transformers based on their mineral oil data are quite difficult. IET Generation, Transmission & Distribution.IET Electrical Systems in Transportation.IET Cyber-Physical Systems: Theory & Applications.IET Collaborative Intelligent Manufacturing.CAAI Transactions on Intelligence Technology.