By Zbigniew Stopa, vice president, Lubelski Wegiel Bogdanka S.A., and Dr. Michael Myszkowski, manager, sales support-longwall AFC’s & Plows, Cat Global Mining

The hard coal located in seams lower than 6 ft at the Bogdanka mine in Poland amount to 80% of all recoverable reserves. For that reason Bogdanka decided to implement plow technology as the solution for clean and economically reliable extraction of thin seams. The first plow system commissioned in the 2010 was based upon conventional two speed motors. In 2012, Bogdanka started the second plow face, but this time based upon Variable Frequency Drives (VFDs) developed by Cat especially for Bogdanka. On this second system both the face conveyor and the plow are powered with VFDs. The authors will provide an overview of the VFD technology used at Bogdanka and discuss comparative operational experiences between the conventional and VFD-powered systems.