Yes. This is a common effect when remote voltage regulators correct uneven phase voltages.
WHAAAAT?! I was under the impression that it was always 3phase from hydro with a step down and no other interference (How ignorant am I?). You're breaking my brain here. I'll need to check the phasors on...
I have seen many instances where a primary distribution voltage imbalance and phase shift were transferred to a secondary system.
Many had dedicated transformer banks, some utility owned, some privately owned.
Like a phase shift where the 3 phases are not completely 120 degrees apart?
Assuming the soft starter is bypassed on running.
Yes it is.
Also depends on the frequency of the leakage current. Different frequencies will tell you the unbalance reason for the leakage. Turn to turn faults will be at a different frequency than normal noise.
I haven't thought about this...
I've got 400kW motor with a soft starter that trips sometimes on an unbalanced current (larger than 15%), supply voltage on load is 591V-595V-603V in a delta configuration. corresponding currents are 353A-373A-422A. From what I'm reading is that a 1% imbalance in phase voltages contributes to a...
