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Evaluation of in-service power transformer health condition for Inspection, Repair, and Replacement (IRR) maintenance planning in electric utilities

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International Journal of System Assurance Engineering and Management Aims and scope Submit manuscript

Abstract

This article focuses on evaluation of in-service power transformerphysical health condition using Health Index (HI) approach. The Health Index (HI) approach is applied by incorporating three key stages such as input for health index assessment, health index estimation and output health index for maintenance decision process of each transformer unit. The first stage is based on condition index, and importance index assessment and also through applying scoring and weight scheme for each test parameter. The condition index of a specific power transformer is evaluated by twelve different diagnostic tests and importance index is assessed from five different factors such as age, loading history, maintenance records, failure/faults, and its location, etc. Numerical weighting and scoring factors were assigned for every test/factor to determine the actual condition of the power transformers with regard to condition and importance aspects. In second stage, By combining the condition and importance index assessment evaluation, the numerical value called Health Index (HI) was estimated, which represent the overall health of a power transformer asset. In third stage, health index estimation results were used to plan for effective maintenance tasks. Through this approach, a case study was performed for 21 in-service power transformers belonging to Tamil Nadu electric utility. The HI results of 21 transformer units were ranked and classified into poor/failed, fair and good, which were further facilitated for Inspection, Repair, and Replacement (IRR) maintenance decisions. Thus, the study is very useful to utility maintenance engineers for better understanding the transformer physical health condition and required maintenance actions timely, which prevents unexpected failure and also reduce cost of maintenance in electric utilities.

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Abbreviations

CI:

Condition index

HI:

Health index represent the overall physical health condition of a power transformer asset

II:

Important index

nci :

Number of diagnostic tests considered for calculation of the condition index

nii :

Number of impotence criteria considered for calculation of the importance index

Sci :

Score of each diagnostic test criteria corresponding to parameter “ci”

Sii :

Score of each impotence index criteria corresponding to parameter “i”

Smaxci :

Maximum score of each diagnostic test criteria corresponding to parameter “ci”

Smaxii :

Maximum score of each impotence index criteria corresponding to parameter “i”

Wci :

Weighting factor for each diagnostic test criteria corresponding to parameter “ci”

Wii :

Weighting factor for each importance index criteria corresponding to parameter “i

CC:

Capital cost of the transformer

PWV:

Present worth value of the transformer at the end of year

ACP:

Annual Costs phase of in service transformer

ACO:

Annual cost of operation

ACF:

Annual cost of failure

ACR:

Annual cost of repair

EAC:

Equivalent annual cost of in service transformer

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Acknowledgments

The authors gratefully acknowledge Tamil Nadu Eclectic board, and Anna University, Chennai, for supporting this research under the Anna Centenary Research Fellowship Scheme No:14/CR/ACRF/2014.

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Authors and Affiliations

  1. Department of Electrical and Electronics Engineering, College of Engineering Guindy, Anna University, Chennai, Tamil Nadu, 600025, India

    Raji Murugan

  2. Professor and Head, Department of Industrial Engineering, College of Engineering Guindy, Anna University, Chennai, Tamil Nadu, 600025, India

    Ramasamy Raju

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  1. Raji Murugan
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Correspondence to Raji Murugan.

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Murugan, R., Raju, R. Evaluation of in-service power transformer health condition for Inspection, Repair, and Replacement (IRR) maintenance planning in electric utilities. Int J Syst Assur Eng Manag 12, 318–336 (2021). https://doi.org/10.1007/s13198-021-01083-1

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