Journal ArticleDOI
Analysis of Overvoltages Caused by Transformer Magnetizing Inrush Current
D. Povh,W. Schultz +1 more
TLDR
In systems with pronounced resonance conditions and a low degree of damping, temporary overvoltages may develop when transformers are switched in or at fault clearing as discussed by the authors, which can occur e.g. in generator networks feeding HVDC stations and in high voltage cable systems.Abstract:
In systems with pronounced resonance conditions and a low degree of damping, temporary overvoltages may develop when transformers are switched in or at fault clearing. Overvoltages can occur e.g. in generator networks feeding HVDC stations and in high voltage cable systems.read more
Citations
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Journal ArticleDOI
Matrix Representation of Three-Phase N-Winding Transformers for Steady-State and Transient Studies
TL;DR: In this article, the authors describe the derivation of mdels for three phase and single-phase N-winding transformers in the form of branch impedance or admittance matrices, which can be calculated from available test data of positive and zero sequence short-circuit and excitation tests.
Journal ArticleDOI
Low-order harmonic interactions on AC/DC systems
TL;DR: In this article, a linearization of the harmonic interaction between AC and DC sides of the converter, including the effect of control action, is proposed for the evaluation of possible adverse amplification of low-order harmonics.
Journal ArticleDOI
Harmonic analysis of transient currents during sympathetic interaction
TL;DR: In this paper, the harmonic content of the transient currents and its associated overvoltages were analyzed, with the importance of taking into consideration the saturation characteristics of the transformers already in operation when studying transformer transient inrush.
Journal ArticleDOI
A simple representation of dynamic hysteresis losses in power transformers
F. de Leon,Adam Semlyen +1 more
TL;DR: In this article, the authors describe a procedure for the representation of hysteresis in the laminations of power transformers in the simulation of electromagnetic transient phenomena, which is based on the recognition that in today's iron cores the hystresis loops are narrow and therefore the modeling details are only important in relation to the incurred losses and the associated attenuation effects.
Journal ArticleDOI
Transformer Saturation Effects on EHV System Overvoltages
TL;DR: In this paper, an analysis of transformer saturation affects system overvoltages caused by transformer energization, fault application and clearing, and load rejection, supported by results obtained on a typical long EHV transmission system using a power system simulator.
References
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Journal ArticleDOI
Energetical factors in power systems with nonlinear loads
TL;DR: Based on the volt-ampere characteristic of the nonlinear load, an equivalent circuit, containing linear elements, can be determined and load-flow and harmonic compensation studies can be simplified.
Journal ArticleDOI
Overvoltages in HV DC Transmission Systems Caused by Transformer Magnetizing Inrush Currents
TL;DR: In this paper, the results of many thousands of model tests are included, and the effect of transformer magnetizing inrush currents on the ac busbars of the HV DC convertor station is examined.
Overvoltages in hv dc transmissionsystemscausedby transformermagnetizing inrushcurrents
TL;DR: In this article, the effect of transformer magnetizing inrush currents, generating overvoltages at the AC busbar of the HV DC convertor station, was examined and the results of manythousandsof modeltests were included.
Journal ArticleDOI
AC System and Transformer Representation for HV-DC Transmission Studies
TL;DR: Due to the oscillatory nature of the combination of ac system and ac harmonic filters in an HV-DC transmission scheme, transformer magnetising inrush currents have particularly important effects on the overvoltages and transient behaviour of the scheme as discussed by the authors.
Journal ArticleDOI
Parametric behavior of the dynamic period overvoltage on power transmission systems
J.M. Przyjemski,J.G. Kassakian +1 more
TL;DR: In this article, a physical understanding of the dynamic period response of transformer terminated transmission lines is developed using a simplified single phase lumped model and time domain analysis, and the sensitivity of the response to various circuit parameters is predicted based on this analysis and then verified using numerical techniques.
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