Diesel generator cooling methods are generally divided into three types: air, hydrogen and water. The cooling system of a general synchronous generator is closed and the cooling fluid is recycled.
1) Air Cooling – Air cooling is done by fans. Cold air is blown against the ends of the diesel generator windings, the generator set stator and rotor to dissipate heat. absorbs heat. Then it turns into hot air. After the air between the stator and rotor is fused, it is discharged through the iron core air duct and cooled by the cooler. The cooled air is then sent into the generator by the fan to circulate there to achieve the heat dissipation goal. The machines generally use air cooling for medium and small synchronous generator sets. ,
2) CoolingHydrogen Cooling - Hydrogen cooling uses hydrogen as a cooling medium. The heat dissipation performance of hydrogen is better than that of air. Most large turbine generators use hydrogen cooling.
3) Water cooling - water cooling uses dual internal water cooling of the stator and rotor.
Regarding air-cooled and internally cooled hydrogenerators, the following statements are correct ( ).
The cooling water from the water-cooled generator does not come into contact with the stator coil. According to relevant public information, the stator coils of the water-cooled generator are not in contact with the cooling water and there is no direct physical connection between them. The cooling water of the water-cooled generator acts only on the excitation coil, while thestator coil is affected by the induction of the alternating current magnetic field.
Answers: A, B, D
Hydraulic generators can be divided into cooling methods: ① Air cooling type. The heat generated inside the generator is cooled by circulating air. Generally, a closed type with automatic circulation is used. The cooled and heated air is then forced through a water-cooled air cooler to participate in repeated cycles. ②Internal cooling type. When the generator capacity is too large and air cooling cannot achieve the expected effect, internal cooling is used for the generator. When the stator and rotor are directly supplied with cooling water for cooling, it is called a fully water-cooled hydrogenerator. When the rotor excitation winding and the iron core are still cooled par air, we speak of a semi-water internally cooled hydrogenerator.