Effect of Class F Rotor in Class B Stator Generator?
Effect of Class F Rotor in Class B Stator Generator?
(OP)
What is the effect of having a class F rotor installed in a class b generator stator? There is two generators both 50MW at 13.8KV 60Hz. One has a bad stator and one has a bad field rotor. Can they be combined to make one good generator? What would the final insulation level be?
If someone has a good reference site on the generator design and the insulation classes and temperature rise for me it would be greatly appreciated. Thank You.
If someone has a good reference site on the generator design and the insulation classes and temperature rise for me it would be greatly appreciated. Thank You.





RE: Effect of Class F Rotor in Class B Stator Generator?
And otherwise all should be fine as long as the windings details and dimentions are the same.
hope this helps
Jeff
www.motors-direct.co.uk
RE: Effect of Class F Rotor in Class B Stator Generator?
Most stators of that size will have a fair number of stator RTDs, and the stator temperature will trigger either an unload or trip when the temperature exceeds a threshold. If you treat the combined unit as a Class B machine you shouldn't have any problems, provided the rotors are identical other than the insulation class.
Is the stator definitely Class B? It is quite common to design a machine to achieve a Class B rise, but insulate it to Class F. Worth checking out.
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RE: Effect of Class F Rotor in Class B Stator Generator?
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RE: Effect of Class F Rotor in Class B Stator Generator?
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As stated above most important are the winding parameters to be compatible rather than the class F insulation, which will be an advantage if the stator is rated and limited to operate under insulation class B.
RE: Effect of Class F Rotor in Class B Stator Generator?
50MW generator is a big thing, stator class B insulation is somewhat intriguing! maybe it's higher than B. Try to check it out!
If it really identical and only it differs on their insulation class, you may have no problem. The heating effect on stator winding will be conveyed and taking care by the temperature monitoring device that senses the stator winding temperature.
Moreover, rotor and stator insulation is limited on generator's capability curve that is, low power factor (lagging) affects rotor heating while leading PF will affects the stator.