STUDY OF THE DC VOLTAGE CIRCUIT BREAKERS COMMUTATION WITH EMTPWORKS SOFTWARE SIMULATIONS
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2010, Vol 34, Issue 34
Abstract
DC voltage circuit breakers, initially intended for protecting and disconnecting the rectifiers (AC/DC converters), have a wide using in high voltage systems. This paper presents the results of turn-off LC circuit simulation with EMTPWorks software, which is connected in parallel with the main contacts of a circuit breaker. The semiconductor devices, thyristors, used in the module were adopted because of the low switching frequency and the high capacity to withstand overcurrents, much higher than the rated value, close to the short circuit current. This paper shows in which way the direct current commutation problem is related to HVDC systems, with voltages of 100kV and current values higher than 10kA. In order to solve DC switching problems three methods of creating a zero point of short circuit current focusing on inverse current injection method are presented. The results of the simulation show that the value of the reverse current injected is 30% of the short circuit current value. As further work, the authors intend to determine the maximum value of the reverse current injected relative to the short-circuit current value and to analyze the situation in which the value of the injected reverse current is equals the value of the short circuit current.
Authors and Affiliations
Elena STEFAN, Horia BALAN, Mircea BUZDUGAN, Petros KARAISSAS
Keywords
Related Articles
- EP ID EP107971
- DOI -
- Views 122
- Downloads 0
Application of Two Direct Optimization Methods on a SMES Device by DOE and FEM: Method by Zooms and Method by Slidings of Plans
The Design of Experiments (DOE) applied to electrical systems modeled by the finite element method (FEM) has become a useful strategy to solve many optimization problems. In this paper, two direct optimization...
RESONANT SOURCE FOR THE SUPPLY OF ELECTRIC FIELD PROBE CALIBRATION SYSTEM AT FREQUENCIES BETWEEN 50Hz AND 50KHz
Electromagnetic environmental conditions checking and provision regarding long and short time human personal and occupational exposure is regulated by international standards. Generally, the human being is exposed mainly...
Analyzing Signals from a Primary Winding of a Locomotive Transformer with Three Types of Wavelet-Based Transforms
The paper is concerned with the analysis of in-stantaneous values and evaluation of certain power quality indices corresponding to phase currents and voltages ac-quired from the primary winding of a locomotive trans-form...
“OPEN-ENDED LABORATORY” METHOD APPLIED IN THE CONCEPTION OF A TEST BENCH TO SIMULATE A DIESEL - ELECTRIC TRANSMISION
This paper describes the application of a creative method (open-ended laboratory) in a research team work, to create an experimental bench which could be used, with various objectives, in the study of Electrical Machines...
Analysis of the Phaseportrait for the Lü Dynamical System in a Particular Case
In the present paper it is started a qualitative analysis of the Lü dynamical system, using the appropiate tools of Hamilton-Poisson geometry and using the software for mathematics MAPLE 15. The Lü’s system arise from el...