During a temperature-rise-test (TRT) in the lab the device to be tested is fed 4kA current taken directly from the grid. Usually the voltage applied is 1V so that the power during the test comes to about 4KW.
Now we are investigating how we can improve the efficiency of this lab and TRT.
Is it...
The motor runs at an average 900KW when keeping the generator up to speed.
During a test we did today the energy demand was 1650KWh. The test lasted two hours in which the motor was turned off once during the procedure for 15mins (which resulted in the generator running down its speed).
As you...
Correction: The Motor is 2.5 MW
@ LionelHutz
The 'run down' phase refers to time when we switch off our motor and let the generator run down from its peak 2975 rot/min to about 1500 and maintaining this low speed by manually turn on/off the motor.
I am aware that during our operation we can...
We have an asynchronous slip-ring induction Motor and we are currently evaluating ways to improve our energy efficiency. We have two concrete suggestions so far
Motor-Generator specs
6KV, 25MW
Pf= 0.9
R= 2975/min
f=50Hz
i) Slip-Ring Recovery System
Saving the slip power during the run-down...
We let the generator run down from 3000 to 1000 RPM by turning off the motor.
This is done to avoid large start-up power between test intervals if they are happening in rapid succession.
The slip-ring recovery system will allow us leave such primitive energy saving methods and we can simply...
I will check with the companies if they have an internal solution. As far as I know we do not have any cascade arrangement hence no way to feedback electricity.
The solution I am looking for with the slip-ring recovery system should replace resistors in the motor and ideally also the generator...
I haven't seen the internal machinery. I am working on the information provided to me.
It is an asynchronous slip-ring rotor Motor running as a pony-motor. Its purpose is to power our 2-pole short-circuit Generator to provided the electricity for our tests.
On recommendation I was able to get...
The drive system is connected in the Generator-Motor circuit. It can power on/off the motor & generator, or reduce the speed of the RPM.
In the control room I can see the displayed RPM at any moment and any load. As for how it does its speed control that I something I am also investigating.
@LionelHutz
The breaks between testing procedure are usually because of rest breaks for employees. There have been cases that the Generator runs 4 hours and the actual time for testing is only 2 hours but spread over this interval. This is why we are looking at if and when we should turn off or...
Ok so far there have been 2 concrete recommendation. Correct me if I am wrong
i) Slip Ring Power Recovery Sytem (SPRS):
A variable speed drive for slip ring induction motors. It recovers and delivers the slip* dependent rotor power from the motor to the grid.
This sounds more promising...
@electricpete
The info on the nameplate I wrote in my opening post. The Generator runs as long as the tests are being done. Usually a test procedure goes for 1 hour. When there is a long break between procedure the generator is either turned off... or slowed down to like 1000 rotations/min.
I...
