Swiss energy supplier Axpo is close to finishing the demanding large-scale "Linthal 2015" construction project: Switzerland's largest hydroelectric undertaking will increase the overall output of the existing Linth-Limmern power plants from 480 MW to 1,480 MW.
Switzerland , 2015-07-23
A new underground pumping station was constructed to pump water from the Limmernboden reservoir at an altitude of 6,100 ft. above sea level into the Muttsee lake which is about 1,960 ft. higher up. This elevation difference allows for the production of hydroelectric power on demand. At an extreme incline of 45 degrees and height difference of about 590 ft., conveyor systems in a sub-station transported 500 tons of excavated material per hour, around the clock. A second conveyor belt transported crushed material up to the gravel plant where it was stored or processed for further use. For three years these conveyors were driven by NORD industrial gear units and transported approximately one million tons of material.
After the completion of the conveying tasks, the NORD industrial gear units were disassembled by plant manufacturer Marti Technik AG, and are now awaiting their next assignment. Ernst Kuster, head of conveyor maintenance at Marti Technik says, “In compliance with the instruction manual, we changed the oil once, but that was the only maintenance measure we had to take over the course of three years. The NORD gear units performed brilliantly.”
The industrial gear units qualified for this massive construction project due to NORD’s UNICASE™ design. This one-piece housing ensures high precision, rigidity and strength with no joints between the output side of the gear case which is subject to radial forces and torque. UNICASE™ housings are manufactured on state-of-the-art CNC machines in one single location. The overlapping bearing offset allows for more a more compact gear cases and larger roller bearings that allow for a long operating life.