60 Hz to 50 Hz Steam Turbine Frequency Change Possibility

This may seem a stupid question. If you are running 50Hz 11KV why have you got a 60Hz 13.8KV generator?

Maybe once upon a time it was a 50Hz 11KV generator that was sped up to 60Hz? Then we're in the clear....

There was a similar thread sometime back,refer it.

Change the governor or governor setting to slow down the RPM.

It can be slowed down,but don't expect 10.000MW from it, Mildred.

"change frequency of generator from 60 Hertz to 50 Hertz without any change in generator"

You want to do this for NO MONEY. You should have purchased the correct equipment to start with!!

You don't get something for nothing.

Frequency Converters - Advanced Power and Controls

Consider Pakistan

Sometimes, you take what you can get.

Yes, regardless of who actually owns it.

For better turbine efficiency i rather chance the gear box or retrofit the gear box casing with a ratio which suits for 1500 RPM (Assuming it is a 3 piece layout ) . As per others comments - check with the alternator manufacture about the cooling capacity as the internal blow fans RPM will drop from 1800 to 1500. Also all the aux , i assume has been selected base on 60Hz and it is possible to use inverter . The Blade Tips speed will reduce at lower RPM and the efficiency should follow accordingly.

Continue Generating at 60Hz and distribute Locally at 60Hz

Most appliances will accept the Higher Hertz readily. Those Consumers finding 60Hz intolerable should use Inverters . 60 Hz>>DC>>50HZ . Energy efficiencies can be As GOOD As 95%.

Remember -- today it is routine to convert Ac 3 Ph >> HVDC.>> ac 3 Ph in 1000MW energy levels of transmission

Sorry, did not realize that my answer was nearly the same as yours. I would be remiss to not give you a G. A. Mine seems redundant now...

That is double Whammy

Two Old hands thinking alike

We are both saying the same - but you are so practical-Understanding-sweet!

Please excuse my interrupting your love-fest, but how much does a 10 MVA, pure sinewave, 60 to 50Hz converter cost, fully installed, especially at 13.8kV? Don't get me wrong, I think it's a fine idea that bypasses a lot of the other problems, but what does that convenience cost? For comparison I found a suitable refurbished 10 MVA transformer for $297,000 plus delivery!

Waste Not -Want Not

Location is Pakistan-Not quite floating on Oil

Understood, but putting a cyclo-converter on the output of a generator has no impact on the fuel consumption...except to increase it and the overall cost of the plant.

It would cost a lot. On the other hand, if they switched to 50 hz from 60 hz all the internal and external controllers (in all the factories and plants served at present and in the future), all the synchronized clocks and a lot of what individually "could" be very minor things, but when added up, can end up "the cheap comes out expensive." That combined with some inherent problems such as possible over heating, (lower life cycle) and a host of other problems I can't even imagine but I know will crop up which will result in outages and expensive shut downs and possible law suits.

I suspect that there are two major legs...the one which is served quite happily at present by the 60 hz stuff. (especially the factories whose controllers and time clocks are being properly served). And the "grid" which would synchronize to receive excess capacity. It is the "excess capacity" leg which could benefit from a "drop in" replacement. That leg would normally be a fraction of the 13.8 Kw, and would be much less expensive.

I may be totally wrong about why the OP's supervisors want to switch from 60 to 50 hz, but I can guarantee that the book keepers and accountants have a big say in it! There may be new codes to consider, subsidies which might be available, even the desire to be be more conforming. Nor do I have the information to figure out if the cost of getting power to the grid would possibly pay for the gen set to accomplish this task. But for better or worse, that is WHY I felt that a properly designed and strategically situated gen set woulld be an "off the shelf" and easily reversible choice.

...and sometimes I think I read too much into some of these questions! I just assumed that he saw a great deal on some used power plant equipment and wanted to know how easy/hard it would be to make it operate off of its design frequency, after all who in their right mind would operate both frequencies side-by-side unless they had just moved from one frequency to another.

Very true...

But as has been said...you use what ya got.

It is true.. I was getting a great deal for a used turbine but after looking at all these comments, I suppose it's not that good an idea to buy it. Anyways, Thank you all for the help and Ill just have to look for another one with the right frequency ! Lesson learnt.

Thanks for the feedback!! It helps to improve everybody's experience here.