Journal ArticleDOI
Dynamic thermal modelling of power transformers
TLDR
In this article, the authors introduce hot-spot and top-oil temperature thermal models for more accurate temperature calculations during transient states based on data received in a normal heat run test (i.e., the top oil in the tank of the transformer and the average winding-to-average oil gradient).Abstract:
The aim of this paper is to introduce hot-spot and top-oil temperature thermal models for more accurate temperature calculations during transient states based on data received in a normal heat run test (i.e., the top oil in the tank of the transformer and the average winding-to-average oil gradient). Oil viscosity changes and loss variation with temperature are taken into account. The new thermal models will be validated using experimental (fiber-optic test) results obtained at varying load current on a 250-MVA-ONAF-cooled unit, a 400-MVA-ONAF-cooled unit and a 605-MVA-OFAF-cooled unit. The results are also compared with the IEEE-Loading guide (1995) Annex G method.read more
Citations
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Journal ArticleDOI
Study of PEV Charging on Residential Distribution Transformer Life
TL;DR: A study is presented to assess the impact of PEV charging on a local residential distribution transformer in the US.
Journal ArticleDOI
Transformer Design and Optimization: A Literature Survey
TL;DR: In this article, the authors conduct a literature survey and reveal general backgrounds of research and developments in the field of transformer design and optimization for the past 35 years, based on more than 420 published articles, 50 transformer books, and 65 standards.
Journal ArticleDOI
Numerical investigation of solar system equipped with innovative turbulator and hybrid nanofluid
TL;DR: In this article , the authors used horseshoe shape of fin with perforated tape at the bottom of pipe to improve the thermal efficiency of hybrid nano-powders.
Journal ArticleDOI
Design of microchannel heat sink with wavy channel and its time-efficient optimization with combined RSM and FVM methods
TL;DR: In this paper, a sinusoidal wavy structure of microchannel heat sink intended for active cooling of compact electronic devices such as insulated-gate bipolar transistor (IGBT) has been designed.
Journal ArticleDOI
Diagnostic Measurements for Power Transformers
Stefan Tenbohlen,S. Coenen,Mohammad Djamali,Andreas Müller,Mohammad Hamed Samimi,Martin Siegel +5 more
TL;DR: In this paper, the authors present the status and current trends of different diagnostic techniques of power transformers and provide significant tutorial elements, backed up by case studies, results and some analysis.
References
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Book
Fundamentals of Heat and Mass Transfer
TL;DR: This paper introduced the physical effects underlying heat and mass transfer phenomena and developed methodologies for solving a variety of real-world problems, such as energy minimization, mass transfer, and energy maximization.
Journal ArticleDOI
Review of modern diagnostic techniques for assessing insulation condition in aged transformers
TL;DR: A description of commonly used chemical diagnostics techniques along with their interpretation schemes for transformer insulation condition assessment is presented.
Book
IEEE guide for the interpretation of gases generated in oil-immersed transformers
TL;DR: In this paper, a detailed procedure for analyzing gas from gas spaces or gas-collecting devices as well as gas dissolved in oil is described, including the calibration and use of field instruments for detecting and estimating the amount of combustible gases present in gas blankets above oil, or in gas detector relays.
Journal ArticleDOI
A fundamental approach to transformer thermal modeling. I. Theory and equivalent circuit
G. Swift,T.S. Molinski,W. Lehn +2 more
TL;DR: In this article, a simple equivalent circuit to represent the thermal heat flow equations for power transformers is presented, which uses a current source analogy to represent heat input due to losses, and a nonlinear resistor analogy to simulate the effect of air or oil cooling convection currents.
Journal ArticleDOI
Review of chemical indicators of degradation of cellulosic electrical paper insulation in oil-filled transformers
A.M. Emsley,G.C. Stevens +1 more
TL;DR: In this article, an insulation life prediction model is developed and estimates of insulation life are presented under a variety of oil/paper conditions, which is used to demonstrate that furaldehyde and related products can be used to detect high rates of paper degradation.
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A fundamental approach to transformer thermal modeling. I. Theory and equivalent circuit
G. Swift,T.S. Molinski,W. Lehn +2 more