382095 V4.1 7/06
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Unbalanced Systems
If the values differ from the numbers above, an unbalanced power source system may be the reason. The
magnitude of the differences can be used as an indication of an unbalanced power source system. The
larger the difference, the further unbalanced the system will be.
Balanced and Unbalanced 3 Phase (3P3W or 3P4W) Load System
In order to check if current of a system is balanced, press the button twice to display the
phase diagram with the IUR displayed.
Balanced System
If a 3 phase load system is balanced, the parameters should be as follows:
I1 = I2 = I3
The phase angle for I2 and I1 (I2 ± I1) = ±120
The phase angles of I3 and I2 (I3 ± I2) = ±120
In (current of neutral) = 0A
IUR = 0%
d0% = 0%
d2% = 0%
Unbalanced Systems
If the values differ from the numbers above, an unbalanced load system may be the reason. 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 load will be.
