Homopolar Generation & HP Turbine 1

[neps3]

I like to know the phenomenon of electromagnetism in the HP turbine due to superheated steam at around 550C (Homopolar generation), turbine rub, bearing current pittings. Could you help please.

 

[jbartos]

Suggestion: Visit

http://www.memagazine.org/backissues/february99/features/oldturbine/oldturbine.html

for: rub
etc. for more info.
Bearing current pitting can be caused common-mode currents that are generated by higher harmonics.
Also, the electromagnetism can cause currents that circulates in the turbine or turbogenerator housing.
Visit

http://www.ab.com/drives/techpapers/ieee/ieee.html

for papers on shaft voltages and bearing currents, e.g.

Jay M. Erdman, Russel J. Kerkman, David W. Schlegel, and Gary L. Skibinski, Effect of PWM Inverters on AC Motor Bearing Currents and Shaft Voltages. IEEE - Applied Power Electronics Conference (APEC), Dallas, TX, March 6-9, 1995, pp. 24-33 and IEEE Transactions on Industry Applications, Vol. 32, No. 2, March/April 1996, pp. 250-259.

 

[neps3]

jbartos

Thank you.

I am also looking for an explanation of the superheated steam phenomenon in the high pressure steam turbine and when a rub occurs there is a current flow (circulating) that damages the no.1 / 2 bearing. Could you guide me on this superheated steam homopolar generation phenomenon.