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
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