Cooling of synchronous generators is divided into two types: external cooling and internal cooling:
1. External cooling: including air cooling and hydrogen cooling
Air cooling: cooling. the medium is air, that is, air is used to remove heat generated by losses in the generator. This method has a simple structure, but the cooling efficiency is not high. The maximum installed capacity can reach about 100 MW;
Hydrogen cooling: the cooling fluid is
hydrogen, i.e. hydrogen is used to dissipate heat. High cooling capacity compared to air. The ventilation loss is low, but the structure is complex and requires hydrogen storage equipment. The maximum installed capacity can reach around 200 MW;
2. Internal coolingrne: including internal water cooling of stator, internal hydrogen cooling of rotor, etc.
Internal cooling (direct cooling method): the cooling medium is the water, oil, hydrogen, that is, hydrogen, water or oil passes through the inside of the wire to directly dissipate heat. Compared with the above two surface cooling methods, the cooling capacity is high, which can reduce the temperature. generator size, saves materials and facilitates the manufacturing of large capacity generators, but the generator structure is complex, the copper loss is large, the iron loss and mechanical loss are small, and the total loss is similar.
Must be less than 2.5%. The generator stator cooling water is regulated. The hydrogen content standard should be less than 2.5%, otherwise it will affect normal use. ThisThis machine refers to a mechanical device that converts other forms of energy into electrical energy. steam turbine, diesel engine or other mechanical drive.