Cooling system of high capacity synchronous generator

Abstract

This invention relates to a cooling system for a large volume synchronous generator characterizing that a cooler is set at the top of a main generator, the cooling air in it is connected with the air intake and air returning regions of the main generator via air channels and connected with a gap cooling air channel, a rotor cooling air channel, a stator cooling channel and an excitation cooling air channel, then the cooled air with heat enters into the cooler via the air returning region of the main generator to form a complete multi-loop four-channel cooling path cooling various components of a generator very well.

Description

technical field [0001] The invention belongs to the technical field of generator cooling, in particular to a large-capacity synchronous generator cooling system. Background technique [0002] For trouble-free operation and full utilization of their output capacity, large generators must be cooled in order to dissipate heat loss from the windings and cores in the stator and rotor. During the operation of the generator, the energy loss generated by the magnetic force and electric energy will be converted into heat inside the generator, resulting in an increase in the temperature of each part, resulting in an increase in the impedance of the coil, affecting the power generation efficiency, and causing insulation of conductive components Layer damage and damage to other components, so effective cooling is one of the main auxiliary functions of generators. In the known technology, the cooling system of the large-scale air-internal cooling generator is usually arranged at the bot...

AI Technical Summary

Problems solved by technology

During the operation of the generator, the energy loss generated by the magnetic force and electric energy will be converted into heat inside the generator, resulting in an increase in the temperature of each part, resulting in an increase in the impedance of the coil, affecting the power generation efficiency, and causing insulation of conductive components Layer damage and damage to other components, so effective cooling is one of the main auxiliary functions of the generator

In the known technology, the cooling system of the large-scale air-internal cooling generator is usually arranged at the bottom of the main generator, and its main defects are: (1) The generator needs to be packaged and transported separately, and a huge ground must be constructed for on-site installation. Pit foundation, time-consuming and labor-intensive, resulting in long installation period, high cost, and inconvenient installation and maintenance of the cooler; (2) There is usually only one heat exchanger in the cooler, once a failure occurs, it will take a long time to shut down for maintenance, affecting power generation production; (3) The generator rotor, as the main heat-generating part, only relies on the surface to contact the cooling air, and the interior only relies on its own heat conduction to dissipate heat slowly, taking away too little heat, and the heat dissipation effect is poor, which easily leads to coil burnout, insulation failure, and poor operation reliability. It is the end of the coil, where the heat energy is concentrated and covered by the guard ring, so the heat is not easy to dissipate and is the most prone to failure; (4) The exciter is generally exposed or semi-closed air-cooled, and the cold air can only be blown to its surface. The ideal heat dissipation effect cannot be achieved for the interior of the exciter, and at the same time, oil and dust are easy to enter the interior of the machine, resulting in insulation failure, short circuit and other accidents

Although the cooling system of the generator has been continuously improved in the prior art, the cooling effect is not ideal. For example, some axial ventilation slots are set at the bottom of the rotor coil, but since the cooling air enters the slot from both ends, it cannot circulate, reaching No cooling effect

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