Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31103
Analyzing and Comparing the Hot-spot Thermal Models of HV/LV Prefabricated and Outdoor Oil-Immersed Power Transformers

Authors: Ali Mamizadeh, Ires Iskender

Abstract:

The most important parameter in transformers life expectancy is the hot-spot temperature level which accelerates the rate of aging of the insulation. The aim of this paper is to present thermal models for transformers loaded at prefabricated MV/LV transformer substations and outdoor situations. The hot-spot temperature of transformers is studied using their top-oil temperature rise models. The thermal models proposed for hot-spot and top-oil temperatures of different operating situations are compared. Since the thermal transfer is different for indoor and outdoor transformers considering their operating conditions, their hot-spot thermal models differ from each other. The proposed thermal models are verified by the results obtained from the experiments carried out on a typical 1600 kVA, 30 /0.4 kV, ONAN transformer for both indoor and outdoor situations.

Keywords: Hot-spot temperature, Dynamic Thermal Model, MV/LV Prefabricated, Oil Immersed Transformers

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1327778

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1192

References:


[1] Guide for Loading Mineral-Oil-Immersed Transformers, IEEE Standard C57.91, 1995. 12 June 2003.
[2] I. Iskender, A. Mamizadeh, "An improved nonlinear thermal model for MV/LV prefabricated oil-immersed power transformer substations "Electrical Engineering Volum :93 Issue: 1 pages :9-22 Mar 2011
[3] G. Swift, T. Molinski, W. Lehn, and R. Bray, "A fundamental approach to transformer thermal modelingÔÇöPart I: Theory and equivalent circuit," IEEE Trans. on Power Delivery, vol. 16, no. 13, 2001.
[4] IEC 60076-2 power transformer part 2 temperature rise, IEC standard 60076-2
[5] Z. Radakovic, S. Maksimovic, " Non-stationary thermal model of indoor transformer stations ", Electrical Engineering 84 (2002) 109-117 _ Springer-Verlag 2002 , DOI 10.1007/s00202-001-0111-5
[6] D. Susa, M. Lehtonen, H. Nordman, "Dynamic Thermal Modeling of Power Transformers" , Ieee Transactions On Power Delivery, Vol. 20, No. 1, January 2005.
[7] High-voltage switchgear and controlgear - Part 202: High-voltage/lowvoltage prefabricated substation , IEC Standard 62271-202 , 06 2006
[8] IEEE C57.100-1999, IEEE Standard Test Procedure for Thermal Evaluation of Liquid-Immersed Distribution and Power Transformers.
[9] I. Iskender, A. Mamizadeh, "Thermal Capacitance Calculation of Top- Oil Temperature for Power Transformers", International Review of Electrical Engineering (IREE), VOL. 4, NO. 5, Part A, Page 882-886, September - October 2009
[10] V. V. S. S. Haritha, T. R. Rao, A. Jain, M. Ramamoorty, "Thermal Modeling of Electrical Utility Transformer", Third International Conference on Power Systems (ICPS 2009), Report No: IIIT/TR/2009/209, Hyderabad , INDIA, December 2009
[11] Daniel J. Tylavsky, Xiaolin Mao, Gary A. McCulla, "Transformer Thermal Modeling: Improving Reliability Using Data Quality Control", IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 21, NO. 3, Pages 1357-1366 JULY 2006