Original scientific paper
Investigating core influence on transformers insulation diagnostics
Ronald D. Hernández
APA 6th Edition
Borges, R., Hernández, R.D., Ziomek, W. & Plater, R. (2022). Investigating core influence on transformers insulation diagnostics. Transformers Magazine, 9 (3), 108-117. Retrieved from https://hrcak.srce.hr/index.php/280336
MLA 8th Edition
Borges, Roberto, et al. "Investigating core influence on transformers insulation diagnostics." Transformers Magazine, vol. 9, no. 3, 2022, pp. 108-117. https://hrcak.srce.hr/index.php/280336. Accessed 9 Dec. 2023.
Chicago 17th Edition
Borges, Roberto, Ronald D. Hernández, Waldemar Ziomek and Ryan Plater. "Investigating core influence on transformers insulation diagnostics." Transformers Magazine 9, no. 3 (2022): 108-117. https://hrcak.srce.hr/index.php/280336
Borges, R., et al. (2022). 'Investigating core influence on transformers insulation diagnostics', Transformers Magazine, 9(3), pp. 108-117. Available at: https://hrcak.srce.hr/index.php/280336 (Accessed 09 December 2023)
Borges R, Hernández RD, Ziomek W, Plater R. Investigating core influence on transformers insulation diagnostics. Transformers Magazine [Internet]. 2022 [cited 2023 December 09];9(3):108-117. Available from: https://hrcak.srce.hr/index.php/280336
R. Borges, R.D. Hernández, W. Ziomek and R. Plater, "Investigating core influence on transformers insulation diagnostics", Transformers Magazine, vol.9, no. 3, pp. 108-117, 2022. [Online]. Available: https://hrcak.srce.hr/index.php/280336. [Accessed: 09 December 2023]
In a healthy power transformer, the power factor (PF) of the low-voltage winding insulation to the ground (CL) is expected to be less than 0.5 %. In recent cases, the CL PF measured during the factory testing exhibited high values close or above 0.5 %. Investigations have determined that
the issue might be related to a higher than usual core steel interlaminar resistance, occurring due to a combination of shorter burrs and higher non-uniform insulation resistance between laminations. This article describes the phenomena and proposes a test protocol to differentiate the
problem from other issues that cause high CL PFs, such as moisture or contamination / deterioration of the insulation.
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