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Frequency method for identification of resonance overvoltages in transformer windings
2010 10th IEEE International Conference on Solid Dielectrics, 2010The insulation systems of power transformers are subjected to many transient overvoltages. They are usually generated in power systems during lightning and switching operations. If the spectrum of incoming surge voltage matches the winding one, the corresponding resonance might be excited.
Marek Florkowski +2 more
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Modeling of wind turbine transformers for the analysis of resonant overvoltages
Electric Power Systems Research, 2014Switching transients and earth fault in a wind farm collection grid are two transient phenomena which can lead to resonant overvoltages at the LV terminal of the wind turbine transformers as well as inside HV and LV windings. The aim of this paper is to analyze the potential of resonant overvoltage for various winding designs; disc, layer and pancake ...
A.H. Soloot +2 more
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Internal overvoltages in cast resin transformer windings in presence of resonance effects
2008 43rd International Universities Power Engineering Conference, 2008Frequency and impulse responses of cast resin transformer windings are presented. The stress arising during lightning impulse test is compared with that originated during switching operations, in case of oscillating transients.
PESAVENTO, GIANCARLO +2 more
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An Evaluation of Remanent Flux of Autotransformer on Resonant Overvoltage
2019 Modern Electric Power Systems (MEPS), 2019Abnormal resonant overvoltages occur due to the emergence of non-sinusoidal modes of bulk electrical networks. The considered type of overvoltage refers to durable internal overvoltages, which have characteristics that can exceed the maximum permissible magnitude with a certain correlation of the values of the parameters of the extra high voltage power
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Measurement Science and Technology, 2010
Power transformer insulation systems are subjected to many stresses during normal operation due to lightning and switching. If the spectrum of incoming surge voltage matches the winding one, a corresponding resonance will be excited. Therefore external transients occurring in power systems might trigger internal overvoltages of a large maximum value in
Marek Florkowski, Jakub Furgał
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Power transformer insulation systems are subjected to many stresses during normal operation due to lightning and switching. If the spectrum of incoming surge voltage matches the winding one, a corresponding resonance will be excited. Therefore external transients occurring in power systems might trigger internal overvoltages of a large maximum value in
Marek Florkowski, Jakub Furgał
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IEEE Transactions on Dielectrics and Electrical Insulation, 2017 © 1994-2012 IEEE. This paper investigates the feasibility of a cost effective method to prevent internal resonance in power transformers connected to gas insulated substation (GIS) due to very fast transient overvoltage (VFTO) within the GIS.
Mubashwar Hasan
exaly +3 more sources
Resonance Overvoltages in Primary Winding of a Station Service Voltage Transformer
Russian Electrical Engineering, 2018The design of new types of transformer equipment, in particular, station service voltage transformers (SSVTs), requires a detailed consideration of all technical aspects and conditions of their application and their design features. One problem is to provide their resistance to effects associated with their interaction with the grid.
V. S. Larin +4 more
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Transfer Function Based Recognition of Resonance Overvoltages in Transformer Windings
2008 International Conference on High Voltage Engineering and Application, 2008Power transformer insulation systems are subjected to many stresses during normal operation due to lightning and switching. If the spectrum of incoming surge voltage matches the winding one, the corresponding resonance will be excited. Therefore external transients occurring in power systems might trigger internal overvoltages with large maximum value ...
M. Florkowski, J. Furgal
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Analysis of resonance in transformer windings under very fast transient overvoltages
2006 17th International Zurich Symposium on Electromagnetic Compatibility, 2006To study the resonance in transformer windings, under very fast transient overvoltages (VFTOs) generated by switching operations in gas insulated substation (GIS), a single input and multiple output circuit model is presented in this paper which is based on multi-conductor transmission line (MTL) model of transformer windings.
null Haifeng Sun +3 more
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Protection against lightning overvoltages in resonant grounded power distribution networks
Electric Power Systems Research, 2014Abstract AES Sul, a Brazilian electric distribution utility, has recently started a project focused on the installation of neutral resonant grounding devices at the medium voltage side of some substation transformers previously operated with solid grounded neutral.
NAPOLITANO, FABIO +5 more
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