Generator air gaps

[cehouse1983]

Has anyone found a good practise for measuring air gaps between stator and rotor of large generating units?

 

[waross]

If you are a little more specific you may get an answer.
How large is your machine? Horizontal, vertical, high speed or low speed, hydro, steam turbine, gas turbine, diesel, etc?
respectfully

 

[cehouse1983]

Thanks for the reply. Vertical-hydro 80MW/120RPM generating units. I'm currently using a system composed getting the gap measurements with snap gauges and a micrometer. I just don't trust the realiability and accuracy of it. Too much human error involved. I've been doing some research on dynamic air gap monitoring systems. Just wondering if there is a better method of taking static readings. Thanks.

 

[edison123]

I use a feeler gauge and a vernier for small & medium machines. For large machines (>16 mm air gap), slip gauge+feeler gauge and a vernier.

* I would go green if only I were not yellow *