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Specialized Electrical Systems for Mines and OEMs VDMA Based in Menden, Bartec Sicherheits-Schaltanlagen GmbH is part of the Bartec group, which specializes in supplying explosion-protected installations and equipment. The group's mining division has direct representation in Germany, Poland, Slovenia, China and the Russian Federation, and has achieved success in the European, Turkish, Chinese, South American, Indian and CIS markets. Its expertise covers product areas such as switchgear, motors, transformers, frequency converters and automation. Bartec produces switchgear to individual customers' specifications, with units being used for the electrification of mining machines, complete energy trains, power-distribution centers, winches, speed control on conveyors, and for high-pressure pumps. Bartec's motors are available for both high- and low-voltage applications, with customers able to choose between air- or water-cooling for the motor. Motors are available up to a maximum power of 2,000 kW and a voltage of up to 10 kV. As electrification is Bartec's main business focus, it also produces transformers, which are available with power ratings of up to 2 MVA and voltages of 660, 1,140, 3,300 and 10,000 V. The company's frequency converters are designed for powering multi-motor drives with torque balancing for belt and scraper conveyors. They are available in two versions: two- and four-quadrant operation mode, with power ratings of up to 630 kW and voltages up to 1,140 V. These frequency converters are water-cooled and can be used for recuperation. One of the important advantages of using frequency converters, according to Bartec, is the possibility of increasing the productivity of a conveyor system by making the belt travel faster. In the field of automation, Bartec offers explosion-protected computers, video cameras, control panels and network components such as PROFIBUS and CANopen. The company reports that among recent projects, it supplied frequency converters, motors and cooling systems for a belt-conveyor system at the Alardinskaya coal mine in Russia. It is also providing on-going service, including spares to Vorkutaugol's Vorgashorskaya mine, while for the potash producer, Uralkali, it has supplied equipment such as frequency converters, transformers and motors. Current projects include the supply of equipment to the Juzhnaya and Romanovskaya mines in Russia and to OKD's Karviná and Darkov mines in the Czech Republic. In addition, Bartec says it often supplies its equipment to other OEMs in Germany, whose mining and tunnelling products are exported worldwide. Complete Pump Systems for Water Hydraulics Hauhinco Maschinenfabrik G Hausherr, Jochums GmbH & Co. KG designs complete water-hydraulic systems for underground mining and industrial applications. Hauhinco says its highpressure stations for longwall hydraulics are premium, certified systems with all of the necessary approvals. This also applies to its spraying stations for supplying shearer water sprays, coal plough operations and cooling systems for drive motors, the company adds, pointing out that its high-pressure pumps have been operating reliably in the widest range of applications all over the world for more than 60 years. Hauhinco's complete portfolio of high-pressure pumps and valves means that systems can be designed to meet customers' requirements. The most important quality criteria—such as high efficiency and minimal wear—are ensured by state-of-the-art manufacturing and testing procedures. Extremely long operational service lives are achieved by using wear-resistant materials and innovative technical solutions that set standards worldwide. The company's high-pressure systems for longwall hydraulics include the EHP-3K or EHP-5K pumps with electric motors, emulsion tanks, high-pressure and return filters, piping, hydraulic accumulators, control modules, explosion-proof measurement instruments such as flow meters, and provision for data transfer and visualization. Its systems to supply shearer water sprays, coal plough operations and cooling systems of drive motors consist of EHP3K pumps with an electric motor, a water tank and a filter unit, as well as the piping needed. Hauhinco pump systems are available in decentralized and mobile versions, with the decentralized pump systems generally being used for two or three longwall mining areas. The mobile pump systems can travel along the longwall, and are available as suspended or upright versions, featuring a compact design in a frame or mounted on a carriage. The company says that its reverse-osmosis system guarantees clean and saline-free water. Designed as a response to bad water conditions in mines around the world, the system cleans the water before it enters the longwall system, with components enjoying a much longer lifetime as a result. Manufactured in a typical Hauhinco frame, the main components of the system are the filtration unit, the tank, the reverse-osmosis tube and the controller. The system can be integrated without any difficulty into the longwall operation, and is completely automatic. Hauhinco reports that since its market launch in 2010, the system has been installed in a number of mines around the world, where it has proved itself by delivering great water-quality results. A Hauhinco high-pressure pump station with two EHP-3K 200 pump units for use underground. VDMA 20 VDMA MINING SUPPLEMENT • 2013