spin bunker

Centrifugal hoppers are used in turbine and generator production in order to test the finished products prior to delivery for their stability during rotation. A centrifugal bunker has meter-thick concrete walls to absorb the movement energy of falling turbine blades or broken waves in the event of material failure.

Large generators and turbines have to handle enormous speeds at power plants (nominal speed 1500 or 3000 min). At these speeds, generator shafts or turbines have such a high movement energy that a material failure would lead to the large-area hazards of people and buildings. In the case of turbines, the blades are particularly vulnerable. Should they break away from the shaft, the entire machine room of a power plant can be destroyed. The same applies to the generators' runners. These are particularly vulnerable if the braking electrical load from the public electricity network breaks down due to a line fault and does not close the rapid-closing valves of the turbine in time (danger of a generator being uncontrolled by centrifugal forces). In the opposite case, the short circuit close to the generator ("short circuit") leads to abrupt deceleration of the shaft (risk of bursting due to uncontrollable braking forces). Turbines and generators are therefore brought to critical speeds before they are delivered and commissioned in a centrifugal bunker. The spin in the centrifugal bunker is thus the most important quality test of generators and turbines and thus ensures the perfect operation of these machines in power stations. A centrifugal bunker exists e.g. on the Siemens plant in Mülheim (generator and turbine production).

wiki



wiki