Issue
The Current Unbalance formula is not detailed in the DM6200 User Manual.

Product Line
DM6200

Environment
Reading verification

Resolution

The current unbalance is calculated using the following equation:

I unbalance = (Max phase current - Min phase current) / Avg 3 phase current * 100

For example:

Ia = 100 A
Ib = 120 A
Ic = 150 A

Therefore, Max phase current = 150 A, Min phase current = 100 A, and Avg 3 phase current = (100 + 120 + 150) / 3 = 123.33 A.

I unbalance = (150 - 100) / 123.33 * 100 = 40.5 % unbalance

Released for: Schneider Electric Canada