Phase Current Variation
Phase Current Variation
(OP)
I have a power monitor connected to the input of a 440VAC 3-phase voltage regulator. The input transformer is a delta configuration with no neutral. Is it normal to see a difference in the phase current measurements? I am observing the following: L1=0.521A, L2=1.561A, L3=1.964A.
What would be the explanation(cause)for this?
Thank you for helping me understand.
What would be the explanation(cause)for this?
Thank you for helping me understand.






RE: Phase Current Variation
With balanced phase voltages, 3ø current imbalance is usually load based. What is the regulator powering? Of less importance, is the ‘input transformer’ separate from the regulator?
RE: Phase Current Variation
The power monitor is connected to the OUTPUT of a 440VAC 3-phase voltage regulator. The OUTPUT transformer of the regulator is a delta configuration with no neutral.
The regulator OUTPUT is supplying a welding machine's 3 phase tranformer input primary winding whose secondary is providing the necessary voltages for the torch and circuitry of welding machine. I am observing the different phase curents with the weld machine in an idle state and when it is in a weld state. Sorry about the confusion.
RE: Phase Current Variation
Visit
http://www.eng.uts.edu.au/~joe/subjects/eet%5Cpas_aut97.pdf
for Problem 1
http://www.welders.co.uk/arcwelders/sip.htm
(notice a variable inductor at SIP 500)
etc. for more info
RE: Phase Current Variation