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Yes Muthu an option... probably just as hard though to get info on a 7MW reducing gearbox!

Thank you all Its very hard to get information during the planning stages of a project from manufacturers, especially when asking for characteristics and dimensions. Plenty of brochures around, and lots of info on standard 2 and 4 pole items. Hence the call to this forum. Thank you for the...

Hi Would anyone be able to share the dimensions of an 7 or 8MW 500rpm (12p 50HZ) horizontal synch generator

Would anyone know of a good source of commercially available low pass filters to reject 475HZ ripple frequency into 230AC 50HZ 60A loads? The ripple frequency is upsetting LEDs over a wide range of households

Closed loop stepper motors usually have 1000 segments per rev, but with quadrature encoders you can get up to 4000 positions per rev. Micro stepping can be used on 1.8 deg stepper motors. This holds the position between 1.8deg using current control The max is 51200 pulses per rev but you don't...

I can understand using any microstep value to get you to a known encoder position. But that implies that you can only accurately hit 1000 divisions per rev (or maybe 4000 with quad encoders) to be held in closed loop position by the encoder If you want to do 99.3 divisions you can microstep...

Now to answer your question. Usually the kW output is near or the same as as the motor nameplate kW, usually the issue is the efficiency of the turbine it is connected to. I had one client who ran the hydro to the limits of the temperature rise in the stator, which gave him another 5% over...

I have put in over 8 MW of motors as generators ,usually in the range of 500kw to 1MW, including synchronous motors into hydro schemes. However there are some issues that you need to consider a) Any induction motor running as a generator does so with leading power factor. That is to say the...

KCad https://kicad-pcb.org/ Free The main problem is that the online component libraries are not easy to navigate but it is easy to generate your own schematic and footprints of items as needed...

https://www.omc-stepperonline.com/download/CL57T.pdf This is the best document I can find on setup, but doesn't have any information on how it all workd

Thanks, yes I am aware what it should do as a closed loop controller, what I do not understand is the possibility of 51,200 divisions per rev

Perhaps not the place for this question but I cant find the answers anywhere! Small closed loop controllers such as the CL57T and LCDA257S allow settings from 800 to 51,200 pulses/rev from the encoders they connect to. There is only two encoder connections on these modules. Most of the small...

Isolate the generator and then manually close the incomer to the transformer This should liven all of the Pts and show whether the running and incoming are phased matched I do this for all synchronising checks

Thanks for that. Yes the question has arisen because of embedded generation, and an open 11kV line feeding a transformer up a hill. The problem is that nearly everyone you talk to knows of the isobus concept and unearthed connection, but there are many instances (hydro in particular) where the...

If you look at many generation plant connections from MV to HV then the MV (say 11kV) bus is often unearthed until the generator synchronises. The popular idea is that there is no earth return from the MV to the HV and hence, no fault current, no step and touch potential issues, and little man...

Using supplier published MTBF and the e^(-lambda*T) methods for a PLC rack with CPU/Backplane and I/O the unavailability comes to a staggering 1900 hours a year.. Has someone got any sensible fault tree analysis information for PLCs

Micom have a published paper that says that the MTBF of a P341 relay as 30 years. This gives a probability of unavailability of 287 hours/year (12 days) which seems ridiculous. Similarly a 16 module PLC rack, using the same idea of summated lambdas (1/MTBF) and probability of reliability as...

I am looking for some typical information on the phase capacitve currents of transformers. I have a specific need for the selection of a neutral earth NET/NER on a small generator. The specification requires the sizing to be the greater of 10A or 3 x Icap where Icap is calculated from the...

I understand where you are coming from but the IEC world does not use C800 The example is 100/1 5P10 15VA I must admit the Cxxx designations seem easier to understand and specify..

Hi I am going around in circles with CT burden calculations… Can someone assist Say we have the following Ip= 100A, Is=5A, Type=5P, ALF=10, VA=15 and say Rct=0.2 ohm, Rl=0.45 Ohm (50 metres of 4mm2) and Relay Resistance Rr= 0.004 ohm and the fault level is 900 A and the maximum running current...