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Andreas Ebner

Bio: Andreas Ebner is an academic researcher. The author has contributed to research in topics: Inrush current & Emtp. The author has an hindex of 1, co-authored 1 publications receiving 13 citations.

Papers
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Journal Article
TL;DR: In this paper, a systematic transformer inrush current study depending on closing time and residual flux measurement deviations for a 400 kVA dry-type distribution transformer was presented, where the authors implemented an interface between MATLAB and EMTP-ATP to share the strengths of both tools.
Abstract: During energisation of power transformers, transient inrush currents with peaks up to the short-circuit current may arise. Using controlled switching taking into account the residual flux, the transients can – in theory – be eliminated completely. Real factors such as closing time scatter and residual flux measurement uncertainty have to be considered when checking the suitability of controlled switching in the field. On account of this, a systematic transformer inrush current study depending on closing timeand residual flux measurement deviations for a 400 kVA dry-type distribution transformer will be presented in this paper. To carry out the systematic study for the energisation of the first phase, an interface between MATLAB and EMTP-ATP was implemented to share the strengths of both tools. Finally, recommendations for acceptable closing timeand residual flux measurement-deviations depending on the tolerable inrush current peak are given.

13 citations


Cited by
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Proceedings Article
01 Dec 2008
TL;DR: In this paper, a detailed PSCAD model has been developed to study the energisation of a large generator step up transformer from the associated high voltage network under various network configurations.
Abstract: During the energisation of large power transformers high inrush currents are drawn, which can lead to adverse transient power quality effects, such as voltage dips, on the source network. A detailed PSCAD model has been developed to study the energisation of a large generator step up transformer from the associated high voltage network under various network configurations. The model includes the simulation of transformer remanent flux. This paper discusses the basis for the study, presents simulation results and the expected impacts on various configurations of the source network. A comparison of the simulation results to actual energisation data is presented.

9 citations

Proceedings ArticleDOI
01 Sep 2016
TL;DR: In this article, the authors present an overview of the importance and significance of controlled switching in complex power networks and the main objective of controlling switching is to avoid transients in the system.
Abstract: This paper presents an overview of importance and significance of controlled switching in complex power networks. The main objective of controlled switching is to avoid transients in the system. In a power system network transients are the redistribution of stored energy among the system capacitance and inductance whenever there is a change of state. So controlled switching is the method to optimize the instant of switching the circuit breaker resulting in minimal energy redistribution.

5 citations

Journal Article
TL;DR: In this paper, an innovative approach in power system transient analysis is presented, applying a new proposed method to process data obtained from processor built in modern protection power relays, described here appeared precisely while turning the power transformer on and setting it in the no-load condition.
Abstract: ,Innovative approach in power system transient analysis is presented in the paper, applying a new proposed method to process data obtained from processor built in modern protection power relays. The transients, described here appeared precisely while turning the power transformer on and setting it in the no-load condition. The analyzed power transformers 20/0,4 kV are installed to meet the auxiliary needs of the transformer substation TS 110/20 kV Osijek-4 with electric power. Time response graphic presentations of main power parameters and Fourier analysis of higher harmonics are presented in this paper.

3 citations

Proceedings ArticleDOI
01 Apr 2017
TL;DR: This paper presents a novel approach to mitigate the inrush current by using Point On Wave (POW) switching technique and an algorithm is developed using EMTP/PSCAD software and the prototype with the proposed algorithm is built in the laboratory.
Abstract: This paper presents a novel approach to mitigate the inrush current by using Point On Wave (POW) switching technique. The proposed technique is used to limit the inrush current while energizing the transformer. An algorithm is developed using EMTP/PSCAD software and the prototype with the proposed algorithm is built in the laboratory. It is tested by using DSP TMS320F28069 controller. The simulation and hardware results are presented to validate the capability of the proposed system.

2 citations

Journal ArticleDOI
TL;DR: In this article, the analysis of transient states generated along the traction catenary during switching operation in the main supply substation unit was performed using EMTP-ATP software and the results of the analysis showed that the system response is strongly dependent on the breaker closing and opening times.
Abstract: This study presents the analysis of transient states generated along the traction catenary during switching operation in the main supply substation unit. For this purpose, a Swedish autotransformer railway system operating at 15 kV and 16.7 Hz has been chosen as a reference. The simulations of abovementioned system were conducted using EMTP-ATP software. This study presents results of simulations for various conditions and at different loads. The main outcome of the analysis is determination of transient currents and voltages in the system during catenary energisation and de-energisation process. Due to the presence of saturable autotransformers along the catenary the flow of excessive inrush current may lead not only to the overloading and as a consequence main breaker tripping but may also cause slow-front overvoltages. In order to represent the worst case conditions parametric study was performed. It includes variable tripping time of the main circuit breaker and pre-existing residual core flux. The results of the analysis show that the system response is strongly dependent on the breaker closing and opening times. As a consequence, it is possible to determine safe switching conditions in order to avoid large overvoltages or accidental tripping.

2 citations