Conference article

Identification of a Best Thermal Formula and Model for oil and Winding of Power Transformers Using Prediction Methods

Kourosh Mousavi Takami
Mälardalen University, Västerås, Sweden

Jafar Mahmoudi
Mälardalen University, Västerås, Sweden

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Published in: The 48th Scandinavian Conference on Simulation and Modeling (SIMS 2007); 30-31 October; 2007; Göteborg (Särö)

Linköping Electronic Conference Proceedings 27:22, p. 182-188

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Published: 2007-12-21


ISSN: 1650-3686 (print), 1650-3740 (online)


System identification is about building models from data. A data set is characterized by several pieces of information: The input and output signals; the sampling interval; the variable names and units; etc. Similarly; the estimated models contain information of different kinds; estimated parameters; their covariance matrices; and model structure and so on. In this paper we collected Temperature of oil and winding in 230/63kv transformer of SARI Substation and considered the winding temperature for input in the model and oil temperature for out put. After that calculated their data by MATLAB software and get a new model with the good best fit for the heat transfer from core and winding to oil. For verification of were calculated results; has been simulated the process in COMSOL Software.


Best fit; simulation; identification; error; model


1. Dennis; J.E.; Jr.; and R.B. Schnabel; Numerical Methods for Unconstrained Optimization and Nonlinear Equations; Prentice Hall; Englewood Cliffs; N.J.; 1983.

2. A. J. Oliver: “Estimation of transformer winding temperatures and coolant flows using general network method”; IEE Proc.; Vol. 127; Pt. C; No. 6; November 1980

3. VanOverschee; P.; and B. DeMoor; Subspace Identification of Linear Systems: Theory; Implementation; Applications; Kluwer Academic Publishers; 1996.

4. Verhaegen; M.; "Identification of the deterministic part of MIMO state space models;" Automatica; Vol. 30; pp. 61-74; 1994.

5. Larimore; W.E.; "Canonical variate analysis in identification; filtering and adaptive control;" In Proc. 29th IEEE Conference on Decision and Control; pp. 596- 604; Honolulu; 1990.

6. Kourosh Mousavi Takami; Evaluation of oil in over 20 year’s old oil immersed power transformer; Mazandaran University; May 2001.

7. Kourosh Mousavi Takami; Advanced Transformer Monitoring & Diagnostic Systems and thermal assessment with robust software’s; research presentation; Water and power University; March 2007; Tehran; Iran

8. Kourosh Mousavi Takami; Hot Spot identification and find a best thermal model for large scale power transformers; April 2006; KTH University; Stockholm; Sweden.

9. M. K. Pradhan and T. S. Ramu; `` Prediction of HottestSpot Temperature (HST) in Power and Station Transformers``; IEEE Transaction on power delivery;vol.18; NO.4;October2003

10. Kourosh Mousavi Takami; Hassan Gholinejad; Jafar Mahmoudi; Thermal and hot spot evaluations on oil immersed power Transformers by FEMLAB andMATLAB software’s; IEEE Conference; Int. Conf. on Thermal; Mechanical and Multiphysics Simulation and Experiments in Micro-Electronics and Micro-Systems; EuroSimE 2007; London; 17 April 2007; pp 529-534.

11. Kourosh Mousavi Takami; Jafar Mahmoudi; Evaluation of Large Power Transformer Losses for green house gas and final cost reductions; 3rd IGEC conference; Sweden; June 18; 2007.

12. Kourosh Mousavi Takami; Jafar Mahmoudi; A novel device (oil spraying system) for local cooling of hot spot and high temperature areas in power transformers; 3rd IGEC conference; Sweden; June 19; 2007.

13. Kourosh Mousavi Takami; Jafar Mahmoudi; Thermal evaluation and energy saving with loss reduction in core and winding of power transformers; 3rd IGEC conference; Sweden; June 19; 2007.

14. Kourosh Mousavi Takami; Jafar Mahmoudi; A new apparatus for mitigating the hot spot problem in large power transformers using Ants algorithm; IEEE PES PowerAfrica 2007 Conference and Exposition Johannesburg; South Africa; 18 July 2007

15. FEMLAB V2.3; Electromagnetics Module. Comsol; 2002.

16. Lates L. V.; Electromagnetic calculation of Transformers and Reactors: Moscow ENERGY; 1981 (In Russian); p.313.

17. IEEE Loading Guide for Mineral Oil Immersed Transformer; C57.91; pp. 18–19; 46–53; 1995.

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