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750MW 120hz Excitor/Alternator Diff

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TheEasty

Electrical
Joined
Nov 17, 2023
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Location
US
This is my 1st experience with a 120hz excitor. The original system has an 87 surrounding just the excitor wdgs GE CFD12 configured for 120hz. We are looking at a digital relay upgrade.

Can anyone give me some wisdom on this 120hz excitor and diff protection scheme?

I never seen a diff on an excitor. Unsually it’s a stator/rotor gnd protection scheme.

Thank you
The Easty
 
You cannot have a differential protection on a rotating brushless exciter armature, which are normally at higher frequency of 120 to 240 Hz for a lesser ripple content in DC output.

Muthu
 
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