Analysis of No-Load Test on a Power Transformer: Case Study of 2.5MVA 33/11KV Transformer Located in Harmony Estate, Nigeria

  • Dan Horsfall
  • Frederick Eneotu
Keywords: Power transformers, No-load test, Load conditions, MATLAB-Simulink simulation, Analysis and testing


This research addresses a significant research gap in the study of no-load test on power transformers. Despite the widespread utilization of no-load tests for assessing core losses and excitation characteristics in power transformers, there is a lack of comprehensive studies exploring the impact of various specific factors, including frequency characteristics, load conditions, instrument conditions, and design parameters, on the accuracy and reliability of no-load test results. Furthermore, the evolution of transformer technologies and materials has introduced new challenges that may affect the validity of traditional no-load test methodologies. To bridge this gap, this study employs MATLAB-Simulink simulations to enhance the analysis by integrating conditional factors and parameters, offering higher accuracy compared to traditional calculations and laboratory experiments. The research will yield two sets of results: one from mathematical equations and another from MATLAB simulations, enabling a thorough comparison and the derivation of valuable recommendations in the power generation industry.


Abanihi, K. V., Aigbodion, D. O., Kokoette, E. D. & Diarah, R. S. (2014). Analysis of load test, transformation, turns ratio, efficiency and voltage regulation of single phase transformer. International Journal of Science, Environment and Technology, 3(5), 1657-1667.
Agena, K., Razmiko, A., Darwin, A., Jonas, A., Caesar, B. J., Kevin, B. M., Ellaine, B. V., Pamela, B., Marivette, B. & Sherlyn, C. (2014). Transformer Core and Transformer Winding. Academia.
Ahmed, A. (2022). Open-Circuit and Short-Circuit Tests in Transformers. EE Power, Technical Article.
Balci M. (2014). On the no-load loss of power transformers under voltages with sub-harmonics. Turkish Republic Ministry of Science, Industry and Technology. Project 01008.STZ.2011-2, pp. 3-7.
Dasgupta, I. (2002). Design of Transformers. McGraw-Hill Education.
Daware, K. (2014). Open Circuit and Short Circuit Test On Transformer. Electrical Easy. and short circuit test on transformer.html
de Melo, A. G., Benetti, D., de Lacerda, L. A., Peres, R., Floridia, C., Silva, A. D. A., & Rosolem, J. B. (2019). Static and dynamic evaluation of a winding deformation FBG sensor for power transformer applications. Sensors, 19(22), 4877.
Glover, J. D., Sarma, M. S., & Overbye, T. J. (2008). Power System Analysis and Design. Thomson Learning, Part or the Thomson Corporation. ISBN: 10: 0-534-54884-9.
Houcque, D. (2005). Introduction To MATLAB For Engineering Students. Northwestern University.
Koprivica, B. & Koprivica, S. M. (2017). No-load Operation of Single-Phase Transformer at Low Frequencies. International Scientific Conference “UNITECH 2017” – Gabrovo.
Nahidul, I. (2021). Transformer Open Circuit Test Using Simulink. Mathworks, Matlab Central File Exchange. Model - R2014a.
Patil, N., & Patil, J. H. (2015). Design and Analysis of Transformer using MATLAB. International Journal of Science Technology and Engineering, 1(12), 23-28.
Popescu, M. C. & Mastorakis, N. (2009). Modelling and simulation of step-up and step-down transformers, World Scientific and Engineering Academy and Society, 1(6), 23-34.
Ramamurthy, J. R., Chiesa, N., Høidalen, H. K., Mork, B. A., Stenvig, N. M., & Manty, A. C. (2017). Influence of voltage harmonics on transformer no-load loss measurements and calculation of magnetization curves. Electric Power Systems Research, 146, 43-50.
Uzoamaka, C. (2022). Analysis of No-Load Test on Power Transformer: Case Study 2.5MVA 33/0.415KV Transformer in Law School Rivers State.
Waldi, T. (2002). Electrical Machines, Drives, and Power Systems (5th ed.). Prentice Hall.
Wiranto, A. (2016). Transformer Basics a Typical Voltage Transformer. Academia.
How to Cite
Horsfall, D., & Eneotu, F. (2023). Analysis of No-Load Test on a Power Transformer: Case Study of 2.5MVA 33/11KV Transformer Located in Harmony Estate, Nigeria. European Journal of Science, Innovation and Technology, 3(5), 62-80. Retrieved from