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Sizing Primary Cables of Excitation Transformer

Sizing Primary Cables of Excitation Transformer

Sizing Primary Cables of Excitation Transformer

(OP)
Good Afternoon.

I´m making a study about the sizing of cables for excitation transformer connection (shunt system) in a synchronous machine.

By the excitation transformer circuit normally flows very low nominal currents, but the short-circuit level is too high.

So, the main sizing criteria is short-circuit level.

Which short-circuit duration can I consider?

And about Protection CT? The short-circuit criteria recommend high nominal values...

Thanks.


 

RE: Sizing Primary Cables of Excitation Transformer

Modern generator circuit-breakers make it possible to interrupt all types of fault currents within four cycles [70-80 msec]. For cable short-circuit sizing 100-150 msec will be fair, I think.

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