This shall be your second GA for your second post!

You might need to explain to OP why he needs a new generator tough, because that he might not have understood yet.

Now I think you deserved another GA. Keep it coming!

And bye the way: Welcome to CR4!

As regards the speed governor , the running speed of the turbine cannot be changed up or down as the compressor blades and the turbine blades are all designed and configured for the rated speed. You could be in compressor surge territory if you ran the turbine at 5/6 rated speed. So it just cannot be done.

The only way to change the speed output is to change the gearbox.

Maybe you could let us know a little more about your problem

You are correct for slow speed industrial turbines, that's why I distinguished between the different types of prime movers. Assuming a gear change so that the turbine runs at its original design speed and the generator at 50Hz, the governor will still sense the same turbine shaft speed as before and control it properly, but any part of the governor that utilizes electrical input from the terminals of the generator needs to be modified.

The comments about the generator still stand though, since operation at lower than design speed can be accommodated if there are no critical frequency issues and it is properly derated.

The over-riding problem is that all the system auxiliaries that are driven by motors, pumps in particular, will run at the wrong speed, plus any control systems that have frequency sensitive power supplies and circuitry will need to be changed, replacing all that could easily make the project uneconomic.

I think that you have received good and correct infos here already. It cannot/should not be attempted.

We used to use "Rotary Converters" to convert voltage and frequency for quite large loads, one or more of these would allow you to change the parameters required, but allow your Turbine generator to continue to work as designed.....

There may be a more modern version (Electronics?) around that I have not heard of.....check carefully.

If the unit is designed strictly for 60 Hz the above posts are correct. The critical parameters are all too far off to be adjusted to 50 Hz operation.

However, GE designed many combustion turbine generators (including frame 5) with dual frequency (50/60 Hz) capability. We currently use a 32 MW LM5000 for peaking in the US 60 Hz grid, but it was purchased used from Asia and was originally connected to a 50 Hz system. The turbine, generator, controls, AVR, etc. were all designed to operate well (but not ideal) at both frequencies. If you have a dual frequency unit it should be stated in the specifications listed in the front of the operating manuals. It may also be on the unit nameplate.

Why?

Beside all the great answers you've been given, i still ask why the hell would you want to do it?

Try this for an idea, sell the one you got and buy another one "fit for purpose".

I think the cost of a new one would be far more economical than trying to adapt/re-engineer the one you have.

And before I go.... 60Hz to 50 Hz!! Have you bought/been given this generator in the USA and are trying to use it the UK or another country that uses 50Hz??

what's the story!!

Run the generator as per design.

Insert a properly sized VFD between the generator output and the load(s) so you have control of the frequency and the voltage magnitude as well as the placement of the torque curve.

It is much simpler, significantly lower cost, and extremely safer.

Interesting thought, perhaps you can provide an estimated cost for a 30 MW, 13.8KV VFD capable of providing approximately 1,250 Amps continuously and 6,250 short circuit Amps for short periods.

i ask a stuped question -- what if the thermo-hydraylic lift is used to lift a water for a water turbine -- like the excavators bucet -- one end has a support reaction -- stuff like that -- ? the vapour pressure doesnot pay off the heat generating it ...

this is even better one (i must stop eating these buff-cheescakes B4 i turn totally nuts) What if you put a stepper stepwise lockable fanns coated propeller infront of the actual wind turbine