Flender/Flender Gear Units/Bevel-helical gearboxes B4
tage power supply, including 1 -houses, the low- and medium-voltage drives for mills and conveyors, and the DCS automation system.

-houses are tailor-made electricity distribution systems for the medium- and low-voltage levels. The individual modules in an -house are completely

assembled and tested before they are transported to the installation point. Due to the high degree of pre-assembly, they can

be quickly set up and commissioned, so deadlines can be kept. The scope of delivery includes two office contain-ers, permanently

installed substation with medium-voltage switchgear, three diesel generators and six capaci- tor banks with the associated distribu- tor transformers. The Peruvian copper mine Constancia lies high up in the Andes at an eleva- tion of 4,3 , and around 1 km south of the city of Cusco. The mine is the first project with sulfur concen- tration plant at an elevation of over 4,2 . The mine, which carries project volume of 1.1 billion, is expected to go into operation in 2 with an estimated yearly production of 8,0 tons of copper. Another success for Siemens was the contract valued at 9,0 for service and maintenance of the Cerro Verde concentration plant. Siemens also delivered variable-speed medium- voltage drives and desalination sys- tem to the copper, lead and zinc mine Cerro Lindo in Chincha, operated by Compaa Minera Milpo ..., with the goal to increase energy efficiency and reduce costs. Cerro Lindo is the first mine in Peru to use seawater in its operations. Last November, Siemens commis- sioned gearless drives for the belt con-veyor at the new Peruvian copper mine Antapaccay, which is owned by Xstrata. The powerful system the second of its type worldwide moves 5,2 tons of ore per hour at speed of over 6 /. The system requires considerably less maintenance than conventional sys- tems. Instead of the typical configura- tion consisting of high-speed motor, couplings and drives, here the low- speed gearless drives p