How many time does a coal fired power station turbines turn per minute?
All thermal power stations, whether coal or oil fired turns turbines at a standard speed required by the driven generator. For a 2pole, 60 Hz generator,3600rpm, 4pole, 60hz,1800.Turbines are provided with speed controls such that rotating speeds are regulated properly.
If the turbine is coupled directly to the input shaft of the generator, then the following is true: For 2 pole generator at 50Hz, RPM 3000 For 2 pole generator at 60Hz, RPM 3600 For 4 pole generator at 50Hz, RPM 1500 For 4 pole generator at 60Hz, RPM 1800 For 6 pole generator at 50Hz, RPM 1000 For 6 pole generator at 60Hz, RPM 1200 Each pair of poles will produce one full alternation (cycle) in 1 revolution. Two pole machines produce one cycle (Hz) with each revolution of the turbine shaft. Four pole machines produce 2 full cycles or alternations with each revolution of the turbine shaft. Six pole machines will produce 3 full cycles or alternations with each revolution of the turbine shaft.
The speed depends on the design of the generator - some examples from around the world: the Dětmarovice (Moravia) power station is fitted with four turbines with the nominal output of 200 MW, and a rated speed of 3,000 r.p.m. Electricity is produced in the stator copper bars by the rotation of the electromagnetic field at 3,000 rpm (Drax, England) Most coal fired turbine generators of this size operate at 3,600 RPM (Pleasants Power Station, West Virginia)
