measuring rotor current
measuring rotor current
(OP)
how can I measure rotor current in running slip ring AC motor ? I know that usual clampmeters can not measure low frequency current ?
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RE: measuring rotor current
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If we learn from our mistakes I'm getting a great education!
RE: measuring rotor current
if the scope is not available, what can be done ?
and if i used the clamp anyway, what would be the error in measuring?
RE: measuring rotor current
How big is this machine? Post some details!
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If we learn from our mistakes I'm getting a great education!
RE: measuring rotor current
rotor current = 600 A
rotor voltage = 1820 V
RE: measuring rotor current
RE: measuring rotor current
Considering the amount of power involved the less interfacing you do with it the better. I still think the isolation amp and 'scope is your best bet in terms of accuracy and safety.
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If we learn from our mistakes I'm getting a great education!
RE: measuring rotor current
RE: measuring rotor current
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If we learn from our mistakes I'm getting a great education!
RE: measuring rotor current
"Which takes us back to the problem of finding a meter which will be accurate at 0.5Hz"
Obviously not a digital, but an old analog meter either center zero moving coil swinging back and forth or a moving iron clampon should be able to indicate that. Perhaps you just take the peak and back calculate the RMS.
I wonder if it's really a true sinosoidal frequency though, there might be lots of harmonics and other effects caused by the winding slots.
Interesting thread.
Roy
RE: measuring rotor current
RE: measuring rotor current
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If we learn from our mistakes I'm getting a great education!