An assessment of distribution transformers performance within Kaduna metropolis, Nigeria

Abstract

In this paper, is an assessment to ascertain the performance of distribution transformers. The simple Transformer Performance Model (TPM) was adopted to determine essential parameters required for calculations with the resultant percentage deviations. Three (3) samples of transformers within Kakuri area in Kaduna State, Nigeria were used as case study. Results from the study indicated that the Insulation resistance for T1 was more than 200M? while those of T2 and T3 fell within a very low range of 60 MOhm to 82 MOhm. Also, the percentage deviation of T1 was 8.92% with respect to the voltage transformation. This showed that T1 had a relatively good voltage transformation ratio as well as insulation resistance. Though values obtained from its short circuit test deviated by an average of 14.91% (higher than the standard limit of ±10%), T1 was still found to be in good (but not perfect) working condition compared to the T2 and T3 which needed immediate overhauling. The calculated efficiencies for all the three transformers were found to be 60% respectively. The condition of these transformers has therefore, made it necessary for performance assessment to be replicated on all other distribution transformers within the Kaduna electricity distribution network and beyond to achieve an optimal system.