Selectivity Curve for 2 source and 1 Big Load

[Nyein_Chan]

Can Schneider Online tools support for Selectivity Curve of 2 Generator Breakers sharing 1 Big Load?

Example; 2 x 400kW Generators supply to 1 x 600kW Thruster VFD. 

Generator Breakers are NT08H1, Micrologic 5.0 and Feeder ACB is NT12H1, Micro Logic 2.2

Upstream breakers are smaller than downstream breaker. 

[Genghiz · Accepted solution]

Hello Nyein Chan,

Thanks for reaching this forum.

The selectivity study by keep upstream smaller (<) than downstream will not be a valid combination.

Regards, 

Team - Ecodial Expert Support

[Genghiz]

Hello Nyein Chan,

There is an additional information, that needs to be considered while doing this kind of design.

During the normal operation, it seems both the "sources" are sharing the load.

However, in a worst-case scenario, only one of them need to manage the load.

So, it's size will not be enough.

Regards, 

Team - Ecodial Expert Support.