The generator stator cooling water system is used to cool the generator stator winding and the outlet side of the high-pressure sleeve. The system is closed circulatory system. Its water quality is generally brine removal from the chemical water supply system. Before entering the generator closed cycle cooling water system, the cooling water is first removed from the ion device for ion exchange, then stored in the stator cooling tank, and then injected into the stator winding by the stator cooling water pump. Usually the temperature of the water entering the stator cooling water is in the range of 35 to 46 °C(different units have different values). 1 /
Generator cooling system
While the generator converts mechanical energy into electrical energy, copper damage occurs due to the current flowing through the rotor and stator coil. The stator core and its side structure parts produce iron damage under the alternating magnetic field. The rotor and stator surface are due to the cutting magnetic field. Local Eddy current loss. In addition, the cooling medium will also produce friction loss, friction loss between the bearing and the oil film. These losses are all in the form of heat. In order to prevent the generator coil from reducing the insulation strength due to temperature increase, or even causing insulation damage, the generator cooling equipment must be set up to discharge the heat generated by the loss in time. In order to ensure that the generator is operating normally at the allowed temperature. Due to the different cooling media and cooling methods, the cooling water system is also different. 1 /
Stator cooling water system
The generator stator cooling water system is used to cool the generator stator winding and the outlet side of the high-pressure sleeve. The system is closed circulatory system. Its water quality is generally brine removal from the chemical water supply system. Before entering the generator closed cycle cooling water system, the cooling water is first removed from the ion device for ion exchange, then stored in the stator cooling tank, and then injected into the stator winding by the stator cooling water pump. Usually the temperature of the water entering the stator cooling water is in the range of 35 to 46 °C(different units have different values).

　Fig. 1 is the stator cooling water system of the generator. The generator stator cooling water system mainly includes a water tank, two 100 % capacity cooling pumps, two 100 % capacity water and water coolers, an ion exchanger, a pressure regulator, a temperature regulator valve, and a filter screen. Valves, pipes, etc. that connect various equipment and components.
The two 100 % capacity cooling pumps can be switched to each other, and the temperature regulator and pressure regulator valves are used to adjust the cooling water temperature and water volume sent to the generator stator winding and outlet sleeve to keep it constant. The cooler outlet pipe is provided with a filter for removing impurities from the cooling water. A small part of the cooling water from the stator cooling water pump is sent to the ion exchanger to ensure that the cooling water conductivity entering the generator is less than 0.5 μs / cm. 
Clean the cooling pipes to prevent blockage. The system is equipped with a flushing line, which can be washed after installation or overhaul of the stator cooling pipe. The stator cooling water tank is provided with nitrogen filling protection. During the operation of the system, the upper part of the water tank is filled with nitrogen to separate the air from the stator cooling water to prevent air from entering the cooling water, thus ensuring water quality. When there is no water in the tank, nitrogen will fill the entire tank and protect the metal surface of the tank from corrosion. 
Main functions of stator cooling water system
The main function of the stator cooling water system is to ensure that the cooling water(pure water) flows through the stator coil without interruption, thus taking away the heat caused by the loss of the stator coil of the generator to ensure that the temperature rise(temperature) of the stator coil conforms to the generator operation. Related requirements. At the same time, the system must also control the pressure, temperature, flow, temperature, water conductivity and other parameters into the stator coil, so that its operation indicators meet the corresponding regulations.