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Question:

What is the usually assumed voltage of 3000kw DC generator design?

Im currently working on a DC generator design . I have my output set to 3000 kw . Any idea what's the usually assumed voltage for this rating ?

Answer:

I believe that DC generators in this size range have been used in diesel-electric locomotives. Today, locomotives are designed with AC drive systems, so there isn't much information about design for DC systems. I found a little bit of Information that indicates that generators of this size may have been designed to operate at about 1200 volts. Edit-1 The 1200 volt design may have been an AC generator with a rectifier connected to two 600 volt DC motors connected in series. The largest DC generators may have been 600 volt machines. Large DC generators were also used in Ward-Leonard drives in steel mill applications and other large industrial applications. It appears that these may have been 600 volt machines. In any case, applications for DC generators began to be converted to AC generators with silicone rectifiers as soon as high-power silicone rectifiers became available in the late 1950's and early 1960's. Today, working on a large DC generator design would seem to be pointless except as an academic exercise. Even the value of such an academic exercise seems questionable.
Jan 26, 2018
Voltage output of any generator (AC or DC) relies upon on the rpm and capability of the magnetic container. So various rpm and/or sterngth of magnetic container will variety the output voltage. be conscious that various rpm of the AC generator additionally changing the frequency of the generator output.
Jan 26, 2018
This is not possible or practical for any reason; especially using DC !!
Jan 26, 2018

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