Hi to all!
A visual inspection reveals that all the tilting paths of the axial thrust bearing of a steam turbine show evidence of electrical current passage. Material is removed from the tilting paths surface, apparently as a result of the electrical current passage. During normal operation the turbine axial rotor position prox probes tell us the rotor is gradually moving in the axial direction and is approaching the axial displacement limit. Steam turbine is directly coupled to axial flow compressor, coupling is electrically conducting, speed 13000 rpm, power 4 MW.
It looks obvious electrical discharge is the cause of electrical current. My question is: Has anyone come across a case where magnetic fields in a steam turbine or compressor generate an electrical current that likes to eat tilting paths?
Regards,
Arie Mol

I have not come accross that.

Generators of course usually have insulated bearings, but I'm not sure about turbines.

Just as a clarification in terminology - I think you are referring to the "tilting pads"

excusez-moi: yes tilting pads!

Is it magnetic fields? Water droplets can result in static electric discharges through the bearings. Some process compressors can create static electricity too.

Electrostatic charge can be generated in steam turbine due to continuous friction with steam which may find its path through the tilting pad bearings. But how sure are you that it is due to electric current passage ? Pl. attach any photo of damaged bearing. Although I have not seen any such problem in non electrical machines , it can be rectified by insulating one bearing or providing earthing brush on shaft.