Sparking at Negative more than at Positive Carbon Brush

Dear all,

I recently observed that a full load i.e. 13MWs, on our gas turbines there is a little sparking observed at the carbon brushes and collector ring contact points. The interesting thing is that the sparking is more at negative brushes than the positive.

Any idea why this is the case? Why is there more sparking at the negative brushes?

I think that since at the negative brush, the current is travelling from collector ring to the carbon brush(breaking) there is more sparkign as compared to the positive brush where the current is travelling from the brush to the collector ring. That's just a theory. What do you guys think?

I would love to know any insight on this.

Regards,
Mutahir
 
In my opinion, since the electrons in the DC circuit flow from Negative Terminal to Positive Terminal that is why the heating is more at the entry point i.e. -ive carbon brush, as opposed to the exit point i.e. +ive one.

But that's just a thought. Ideas anyone?
 
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