To maintain good uninterrupted operation, it is necessary to keep the temperature of the generator set within an acceptable range, which requires understanding the temperature rise requirements and cooling methods. (For reference only: (Fujian Yanan Diesel Generator Set?: 4000-080-999) Yaxiaonan will answer for you)
1. Temperature rise requirements
According to the diesel generator insulation Different grades have different temperature rise requirements. Generally, when the generator is running, the temperature of its stator winding, field winding, iron core, collector ring, etc. is about 80 degrees. If it exceeds 80 degrees, the temperature rise is too high.
2. Cooling methods
Generators of different types and capacities have different cooling methods. But the cooling media used are generally air, hydrogen, and water. Taking the turbine synchronous generator as an example, its cooling system is closed and the cooling medium is recycled.
1. Air cooling. Air cooling adopts the method of fan blowing, using cold air to blow the ends of the generator set windings, the generator set stator and the rotor to dissipate heat. The cold air absorbs heat and turns into hot air. The breath between the stator and the rotor begins. After being combined, they are discharged through the air duct of the iron core and cooled through the cooler. The cooled air is then sent into the generator by the fan for circulation to achieve the purpose of heat dissipation. Medium and small synchronous generators generally use air cooling.
2. Hydrogen cooling. Hydrogen cooling uses hydrogen as the cooling medium. The heat dissipation performance of hydrogen is better than that of air. Most dairy turbine generators use hydrogen cooling.
3. Water cooling. Water cooling adopts the method of double water internal cooling of the stator and rotor. The cold water external water system of the stator water system flows through the water pipe to the water inlet ring installed on the stator base, and flows to each coil through the insulating pipe respectively. After absorbing the heat, it is collected through the insulated water pipe to the water outlet ring installed on the machine base< /p>
, and then discharged into the water system outside the generator for cooling. The cooling of the rotor water system first enters the water inlet support installed on the side shaft end of the exciter, then flows into the center hole of the rotor shaft, then flows to the water collecting tank along several meridional holes, and then flows to each coil through the insulating tube. After absorbing heat, the cold water flows into the water outlet tank through the insulated pipe, then flows through the drainage hole on the outer edge of the water outlet tank to the water outlet support, and is led out by the water outlet main pipe. Since the heat dissipation performance of water is much higher than that of air and hydrogen, newly built large-scale generator sets generally use water cooling.