High Shaft Voltage on 9FA


Thread Starter


We have 2 GE 9FA Gas turbines & suddenly both are giving high shaft voltage Alarm. We have checked the frequency on PTUR card & also on Field JB, it's fluctuating 50 to 100 Hz for both units.

What actions can be performed in this case? which things to be checked after that to confirm this is a real grounding issue or just wiring/shielding issue?

Please advise.
Yeah we have replaced the grounding bushes with original GE recommended one & also their cooling path is ok too.