Common cooling methods for turbine generators include:
(1) Air cooling. It is divided into open air cooling and closed circulation air cooling. The so-called open air cooling is that in ordinary small generators, the generator fan draws cold air into the motor from the factory building, cools each part, and then discharges it out of the machine. Closed cycle air cooling is used in large and medium-sized generators. After the cooling air comes out of the generator, it is led under the machine pit. After being cooled by a set of air coolers, it is driven into the motor by a fan. This air is always circulated internally to keep the machine clean.
(2) Water cooling. Generally, it is double water internal cooling, that is, the conductors of the stator winding and the rotor excitation winding are hollow, cooling water is passed inside the conductors, and the stator bore is still cooled by air. Although the cooling efficiency is high, the inside of the conductor is prone to scaling and clogging.
(3) Hydrogen cooling. It is divided into two cooling methods: hydrogen external cooling and water hydrogen cooling. Hydrogen external cooling is the same as air cooling, except that the cooling medium is changed from air to hydrogen, but the hydrogen cooler is inside the machine. The difference between water-hydrogen cooling and hydrogen cooling is that the stator winding conductor is filled with cooling water, and the rest is the same as the hydrogen external cooling method.
The generator set is composed of two parts: a prime mover (diesel engine, gasoline engine, steam turbine, etc.) and a generator;
The so-called water-cooled unit refers to the use of water to cool the generator (original Needless to mention the motive, it must be cooled with water);
The water-cooled unit has double water internal cooling and single water internal cooling; that is, the stator and rotor are both wires with internal water cooling, which is called double water internal cooling, only the stator The one that uses water and hydrogen to cool the rotor is a single water internal cooling. (Large generators generally no longer use air cooling, but generally use hydrogen, because the mass of hydrogen is much smaller than that of air and its thermal conductivity is much better, which can greatly improve the cooling efficiency; while water has a large heat capacity and a better cooling effect, but it is difficult to larger)