Affiliation:
1. School of Electrical Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, 11000 Belgrade, Serbia
2. Hydro-Québec’s Research Institute (IREQ), 1800 Boul. Lionel-Boulet, Varennes, QC J3X 1S1, Canada
Abstract
The paper presents a physics-based method to calculate in real time the distribution of temperature in the active part of liquid immersed power transformers (LIPT) in a transient thermal processes during grid operation. The method is based on the detailed dynamic thermal-hydraulic network model (THNM). Commonly, up to now, lumped models have been used, whereby the temperatures are calculated at a few points (top-oil and hot-spot), and the parameters are determined from basic or extended temperature-rise tests and/or field operation. Numerous simplifications are made in such models and the accuracy of calculation decreases when the transformer operates outside the range of tested values (cooling stage, loading). The dynamic THNM reaches the optimum of accuracy and simplicity, being feasible for on-line application. The paper presents fundamental equations of dynamic THNM, which are structurally different from static THNM equations. The paper offers the numerical solver for the case of a closed-loop thermosyphon. To apply the method for real transformer grid operation, there is a need to develop details as in static THNM, which has been used to calculate the distribution of the temperatures in LIPT thermal design. The paper proves the concept of dynamic THNM using the experimental results of a closed-loop thermosyphon small-scale model, previously published by authors from McGill University in 2017. The comparison of dynamic THNM with measurements on that model are presented in the paper.
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
Reference35 articles.
1. Tenbohlen, S., Coenen, S., Djamali, M., Müller, A., Samimi, M.H., and Siegel, M. (2016). Diagnostic Measurements for Power Transformers. Energies, 9.
2. (2018). Power Transformers—Part 7: Loading Guide for Mineral-Oil-Immersed Power Transformers (Standard No. IEC 60076-7:2018).
3. (2012). IEEE Guide for Loading Mineral-Oil-Immersed Transformers and Step-Voltage Regulators (Standard No. C57.91-2011).
4. Results of a novel algorithm for the calculation of the characteristic temperatures in power oil transformers;Radakovic;Electr. Eng.,1997
5. Numerical determination of characteristic temperatures in directly loaded power oil transformer;Radakovic;Eur. Trans. Electr. Power,2003
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