60 Hz Generator at 50 Hz
60 Hz Generator at 50 Hz
(OP)
A turbo generator rated for 60 hz is required to generate at 50 hz. Assuming all utility eqipment are changed to 50 hz, and monitoring, metering and protection settings are availible for 50 hz, will changing governer setting to slower rpm and adjusting excitation be able to deliver rated power at 50 hz.





RE: 60 Hz Generator at 50 Hz
*Not always true. Cooling is less effective at lower speed.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: 60 Hz Generator at 50 Hz
Speed: The governor is adjusted to the new speed.
Voltage/excitation: The AVR is adjusted for the new voltage. 50 Hz voltages are typically less than the corresponding 60 Hz voltages. 400 V at 5 Hz and 480 V at 60 Hz comes to mind. The implication is that the V/Hz ratio doesn't change that much with the conversion and saturation is not an issue.
Under Frequency Roll Off. (UFRO) Change the jumper on the AVR from the 60 Hz position to the 50 Hz position.
The maximum current will be the same but the max KVA and max kW will drop at 50 Hz due to the lower voltages.
BUT, this is a diesel set.
I understand that torque drops off rapidly with an aero derivative turbo set. Stand by for the folks with turbo experience to weigh in on the efficiency of a turbo at reduced speed.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 60 Hz Generator at 50 Hz
Overall I would say probably not, at least not without some re-engineering which will need support from the OEM.
----------------------------------
If we learn from our mistakes I'm getting a great education!
RE: 60 Hz Generator at 50 Hz
Milovan Milosevic
RE: 60 Hz Generator at 50 Hz
Muthu
www.edison.co.in
RE: 60 Hz Generator at 50 Hz
If it is an air cooled machine, it will not pass as much cooling air through the core so that will affect the ultimate performance rating capability. Same principal would apply with a TEWAC or H2 cooled machine. Less rotor speed produces less cooling medium flow in the generator internals. That is an integral part of the derate picture already presented.
If the machine was not designed day one to be convertable from one frequency to another, I would check with the OEM to see what the limitations would be. The comment about shaft criticals is important to check out.
If your turbine change to accomodate the frequency change involves a change in direction of rotation, then you will have to reverse your rotor fans and remember if it has a rotating exciter that there may be a fan there too. With some manufacturers, that fan cannot be reversed but has to be replaced.
Modern seroderivitave packages are designed for 50/60 hz with corresponding ratings. Some of the older packages, however were designed for a specific frequency. Much of what you can/can't do if that is what you have depends on whether or not it is a hot end drive or a cold end drive.
rmw
RE: 60 Hz Generator at 50 Hz
RE: 60 Hz Generator at 50 Hz
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 60 Hz Generator at 50 Hz
RE: 60 Hz Generator at 50 Hz
Virtually all the major liquid cooled diesel set makers use the same sets for 50 Hz and 60 Hz. The engines produce virtually the same torque at 1500 RPM as at 1800 RPM with no cooling issues, with either the coolant loop or the air cooling systems.
But this is a turbo question.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 60 Hz Generator at 50 Hz
RE: 60 Hz Generator at 50 Hz
There are arrangmets with different radiators, fans and driving pulleys. Agreed thas is also a turbo question.
RE: 60 Hz Generator at 50 Hz
I just spent some time going over a selection of current specs and I find that more and more sets are frequency specific. There are still a lot of sets suitable for use at either 50 Hz or 60 Hz. More than half of the sets on the specs I just looked at are suitable for 50/60 Hz.
As the sets get larger there is a trend towards frequency specific sets. Some use a mechanical governor at 50 Hz and an electronic governor at 60 Hz. The mechanical governors won't go to 60 Hz, but the electronic governors are suitable for 50 Hz or 60 Hz.
Thanks for the heads up.
Bill
--------------------
"Why not the best?"
Jimmy Carter