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III.13 Balanced and Unbalanced 3 Phase (3P3W, 3P4W) Power
Source System
In order to check if a system is balanced, press this button to display
the phasor diagram with the VUR displayed.
Balanced System
If a 3 phase power source system is balanced, the parameters should be as
following:
V1 = V2 = V3
V12 = V23 = V31
The phase angle of phasor V2 = -120
The phase angle of phasor V3 = 120
Vn (voltage of neutral with respect to ground) = 0V
VUR = 0%
d0% = 0%
d2% = 0%
Unbalanced System
If the values are different from the numbers above, then we can say it is an
unbalanced power source system. The magnitude of the difference can be used
as an indication of an unbalanced power source system. The larger the difference,
the more unbalanced the system is.
