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Generator air gaps

Generator air gaps

Generator air gaps

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

RE: Generator air gaps

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

RE: Generator air gaps

(OP)
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.

RE: Generator air gaps

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.

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