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In the mining industry the profitability goals are often linked to the long belt-conveyors availability. Since the use of the medium voltage variable frequency drives (MV-VFD) in conveying applications is essential to meet various technical requirements, the conveyor service continuity depends on the drive system availability. Although there are at least three established technologies commercially...
The three-level converter with neutral point clamped (NPC), introduced by Nabae in 1981, has become the most popular converter topology for high and medium-voltage industrial drives, being widely commercialized by major manufacturers worldwide. Responsible for driving key processes in various industries, high availability of these converters is mandatory, since their maintenance or replacement imply...
Belt conveyors constitute an efficient and economical way for minerals and heavy load transportation from mines to their destination, they serve vital process units whose success depends on continuous operation. To meet important operational requirements, modern high capacity conveyor systems are equipped with medium voltage variable-speed induction motor drives. The reliability and service continuity...
High power IGCT-based converters are currently used in a wide range of drive applications. The protection of such converters against internal faults has been addressed in the technical literature, but the main focus has been on the solutions to disconnect the converter from the mains. In this paper, the short circuit current paths through the power devices in the three level NPC bridge are identified...
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