Abstract:

The rated current of half-speed generator used in nuclear power plant is higher than that of the normal plant, so the generator terminal box is cooled by forced air. Due to the complex magnetic field and limited space, the heat dissipation and size problem of terminal box can not be solved simultaneously, which may frequently cause the overheating problem of generator terminal box. Aimed to the typical overheating problem of generator terminal box, the analysis methods and source solution are proposed, which analyzs the reasons of overheating problems in detail by using the exclusive method, as well as carrys out comparison verification before and after modification through the simulation analysis on electromagnetic heating. Therefore, the overheating problem of generator terminal box could be early found in the design period.

Key words: high-current, forced air cooling, generator terminal box, overheating