Measurement of efficiency and temperatures in a dry type transformer that feeds a three-phase uncontrolled rectifier
DOI:
https://doi.org/10.46842/ipn.cien.v24n2a05Keywords:
efficiency, K-factor, three-phase rectifier, temperature, dry-type transformerAbstract
This paper presents the laboratory tests conducted for a 5 kVA dry-type transformer feeding a wye-connected resistive load and a three-phase uncontrolled rectifier. The primary purpose is to evaluate the transformer efficiency performance against non-sinusoidal load currents. The laboratory tests are based on the standard NOM-002-SEDE/ENER-2014. The extensive conducted test results are reported through efficiency graphs. The variation of the harmonically distorted load current, due to the rectifier operation, allows to evaluate the K-factor variation for different load levels. In addition to this, the measured internal temperatures are presented in comparative graphs. The temperatures are obtained through thermocouples located between the core and the windings.
References
L. Astudillo, A. Vásquez, J. Rojas, "Implementación de un filtro pasivo para compensación armónica y corrección del factor de potencia," Científica, vol 20, núm. 1, pp 3-11, enero-junio 2016.
IEEE Std. C57.120-2017, Guide for Loss Evaluation of Distribution and Power Transformers and Reactors, 2017.
G. Perez, J. A. Alvarez, J. Segundo, "Comparación de las pérdidas en un transformador tipo seco de 5 kVA ante carga lineal y no lineal," Revista Pistas Educativas, vol. 40, núm. 130, 2018.
J. A. Alvarez, J. Segundo, V. M. Cardenas, R. Alvarez, "Medición de la eficiencia y temperaturas en un transformador seco que alimenta un rectificador 3j", XVIII Congreso Nacional de Ingeniería Electromecánica y de Sistemas (CNIES 2019), Ciudad de México, Nov 2019.
IEEE Std. 1459-2010, Definitions for the Measurement of Electrical Power Quantities Under Sinusoidal, Non-sinusoidal, Balanced, Unbalanced Conditions, 2010.
IEEE Std. C57.110-1988, Recommended Practice for Establishing Transformer Capability When Supplying Non-Sinusoidal Load Currents, 1988.
Elmoudi, M. Lethonen, "Effect of harmonics on transformers loss of life," IEEE International Symposium on Electrical Insulation, pp. 408-411, 2006.
R. Arseneau, E. So, E. Hanique, "Measurments and Correction of No-Load Losses of Power Transformers," IEEE Transactions on Instrumentation and Measurement, vol. 54, núm. 2, pp 503-506, 2005.
J. C. Olivares, J. Cañedo, P. Moreno, J. Driesen, R. Escarela, S. Palanivasagam, "Experimental study to reduce the distribution-transformers stray losses using electrto-magnetic shields," Electric Power Systems Research, vol. 63, 2002, pp. 1-7.
E. Cazacu, L. Petrescu, V. Lonita, "Losses and temperature rise within power transformers subjected to distorted currents," 15th International Conference on Electrical Machines Drives and Power Systems, 2017.
Norma Oficial Mexicana NOM-002-SEDE/ENER-2014, Requisitos de seguridad y eficiencia energética para transformadores de distribución, 2014.
S. Hasan, I. Daut, S. Taib, "K-Factor due to Implementing of DC Unbalanced/Balanced of a Transformer", 2007 Asia-Pacific Conference on Applied Electromagnetics Procedings, Decembre 4-6, 2007, Melaka, Malaysia.
T. Shun, X. Xiangning "Comparing transformer de-rating computed using the harmonic loss factor FHL and K-Factor", 3rd International Conference on Electric Utility Deregulation and Restructuring and Power Thechnologies, 2008, pp. 1631-1634.
Metrel Power Quality Analyzer MI2192, Instruction Manual Version 3, Code No. 20750701, 2003.
M. Salih Taci, A. Domijan Jr. "The Effects of Linear and Nonlinear Operation Modes in Transformers", 2004 11th Int. Confernce on Harmonics and Quality of Power, 2004, pp. 244-249.
M.C. Hernandez, J. Hernandez, F.E. Hernandez, "Sistemas para la gestión de la condición de los transformadores de potencia," Científica, vol 17, núm. 2, pp. 83-88, abril-junio 2013.
R.S. Bhide, M.S. Srinivas, I. Voloh, " Detection of inter-turn fault in transformers at incipient level," XXI Int. Conference on Electrical Machines (ICEM), septiembre 2014, pp, 1542-1548
V. Perez-Amador, Pruebas de equipo eléctrico, transformadores de distribución y potencia, Limusa, 1985.
B. S. Guru, H. R. Hiziroglu, Máquinas eléctricas y transformadores, Alfaomega, 3ª ed., 2002.
Downloads
Published
Issue
Section
License
Copyright (c) 2020 Instituto Politecnico Nacional
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
