Journal ArticleDOI
Harmonics generated from a DC biased transformer
Shu Lu,Yiu Liu,J. De La Ree +2 more
TLDR
In this paper, a saturation model for a single phase shell-form transformer based on 3D finite-element analysis is used to calculate the excitation currents and the variation of excitation current harmonics over an extended range of geomagnetically induced currents bias is determined.Abstract:Â
Harmonic characteristics of transformer excitation currents under DC bias caused by geomagnetically induced currents (GICs) are presented. A saturation model for a single phase shell-form transformer based on 3-D finite-element analysis is used to calculate the excitation currents. As a consequence, the variation of excitation current harmonics over an extended range of GIC bias is determined. The results of this study are useful in understanding transformers as harmonic sources and their impact on power systems during a solar magnetic disturbance. >read more
Citations
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Journal ArticleDOI
Geomagnetically induced current effects on transformers
TL;DR: In this paper, the authors used a mathematical model explicitly incorporating the electric and magnetic circuits, including the shunting effect of the tank, to predict the current and flux waveforms.
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
Mitigation of Lower Order Harmonics in a Grid-Connected Single-Phase PV Inverter
Abhijit Kulkarni,Vinod John +1 more
TL;DR: In this article, a simple single-phase grid-connected photovoltaic (PV) inverter topology consisting of a boost section, a low-voltage single phase inverter with an inductive filter, and a step-up transformer interfacing the grid is considered.
Journal ArticleDOI
Modeling devices with nonlinear Voltage-current Characteristics for harmonic studies
G. Chang,Constantine J. Hatziadoniu,Wilsun Xu,P. Ribeiro,R. Burch,W.M. Grady,Mark Halpin,Y. Liu,Satish J. Ranade,D. Ruthman,Neville R. Watson,T.H. Ortmeyer,J. Wikston,Aurelio Medina,Alfredo Testa,R. Gardinier,Venkata Dinavahi,F. Acram,Peter W. Lehn +18 more
TL;DR: In this article, the modeling of harmonic sources with nonlinear voltage-current characteristics such as transformers, iron-core reactors, rotating machines, arc furnaces, energy efficient lightings, and some household electronic appliances are reviewed.
Journal ArticleDOI
Experimental studies of influence of DC and AC electric fields on bridging in contaminated transformer oil
TL;DR: In this paper, the dynamics of cellulose particles in contaminated transformer oil under the influence of DC, AC and DC biased AC electric field has been investigated, and it is concluded that a combination of DC and AC voltages could lead to a bridge formation within the equipment which could cause failure.
References
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Journal ArticleDOI
Powers in nonsinusoidal situations-a review of definitions and physical meaning
TL;DR: In this paper, the authors expanded on the physical meaning of the reactive power in nonsinusoidal situations, and showed that the total reactive power Q/sub F/ is composed from four distinctive types of elementary reactive powers.
Journal ArticleDOI
Bracing for the geomagnetic storms
J.G. Kappernman,V.D. Albertson +1 more
TL;DR: In this paper, the way in which geomagnetically induced current (GIC) affects power systems is explained and the factors that make power networks especially vulnerable today and the difficulty of predicting episodes are considered.
Journal ArticleDOI
Characteristics of transformer exciting-current during geomagnetic disturbances
R.A. Walling,A.N. Khan +1 more
TL;DR: In this article, an efficient method allowing the transformer flux offset and exciting current waveform to be determined for combined AC and geomagnetically induced current (GIC) excitation, without lengthy time-domain simulations, is described.
Journal ArticleDOI
Current Transformer and Relay Performance in the Presence of Geomagnetically-Induced Currents
TL;DR: In this article, the effect of geomagnetic field disturbances on current transformer and relay performance was investigated, and the average CT flux density and CT error were examined in the presence of GIC.
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