Generator de-rating - 60 Hz to 50 Hz
Generator de-rating - 60 Hz to 50 Hz
(OP)
Anyone remember the theoretical derating factor from a 60 Hz system to a 50 Hz system. I know that individual manufacturers vary, but I can't recall the basis for the derating.






RE: Generator de-rating - 60 Hz to 50 Hz
RE: Generator de-rating - 60 Hz to 50 Hz
I vaguely remember some thumb rule about output being 20 MVA per metre of core length for 3000 RPM machines (50 Hz).
RE: Generator de-rating - 60 Hz to 50 Hz
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RE: Generator de-rating - 60 Hz to 50 Hz
In, generators, the voltage will derate by 5/6, with the same flux density (i.e. without doing anything to the winding).
What you say will apply to the motors however.
RE: Generator de-rating - 60 Hz to 50 Hz
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RE: Generator de-rating - 60 Hz to 50 Hz
I mentioned both output and volt drop (see my posts). with reduced output, naturally kvar capacity too comes down with correspondent reduction in rotor current.
RE: Generator de-rating - 60 Hz to 50 Hz
Often seen mathematical relationship for generated open circuit voltage over the magnetic circuits as:
Vtt=fundamental rms terminal-to-terminal voltage=(2xpi/sqrt2)xFIxfxNx(KpxKdxKsxKfi)
where
FI is fundamental flux per pole in Webers
f is line frequency in Hz
N is total number of turns in series between terminals (equals 2 x series turns per phase for 3-phase Y-connection)
(KpxKdxKsxKfi) constant factors
RE: Generator de-rating - 60 Hz to 50 Hz
RE: Generator de-rating - 60 Hz to 50 Hz