Generator Stator Cooling System

The losses occuring in the generator stator winding components viz stator winding, main brushes & phase connetors are dissipated directly through water.

The cooling water being in direct contact with voltage winding, must have an electrical conductivity of order of 0.5 to 1 µΩ .


The stator winding is cooled by closed circuit circulation of low conductivity water ( Demineralised water) through the hollow rectangular conductors which from the cooling system for higher rating (200 MW & above) Generator.

The cooling water from the expansion tank is circulated by two 100 % duty AC motor driven , centrifugal pumps , one working and the other standby.

The pump are electrically interlocked between each other in such a manner that the standby pump automatically starts up in case of water drops in the circuit. In case of the pressure is still less, an alarm signal appears and machine should be tripped.

a. The genset with medium and high standard configuration adopts closed circulation liquid cooling mode with its own fan. The cooling system circulation loop basically consists of the following parts: water pump; waterway between the engine cylinder block and the cylinder head; thermostat; bypass pipe between the thermostat body and the water pump; water tank radiator; pipeline and hose; lubricating oil cooler.

b. Medium and high non-standard configuration genset, such as split water tank type unit, water tank radiator should be replaced by heat exchanger, while there are expansion tank and remote tank, such as the remote tank installation position is relatively high, the transition tank should be added, to prevent the heat exchanger from being damaged due to excessive internal pressure.

c. In addition, all medium and high generator set can be separately equipped with coolant filtration device upon user’s request. The device has two functions: A, block all impurities in the coolant and prevent scale formation in the cooling system; B, improve the corrosion protection performance of the coolant.

d. All kinds of dirt on the radiator chip can greatly reduce the cooling performance of the radiator. Therefore, in a dusty environment, it is necessary to clean the radiator frequently.