hager h3+ - Measuring Unbalances

46 6LE005550A
Function of the Energy trip unit
3.3 Measurement function
3.3.4
Measuring unbalances
The Energy trip unit calculates in real-time (every second) current and voltage
unbalances.
Current unbalance is expressed as a % in relation to the average current.
I
avg
=
I1 + I2 + I3
3
I
p
unbalance =
I
p
- I
avg
x100 with P = 1, 2, 3
I
avg
I1 I2 Imoy
I1 - Imoy
<0
I2 - Imoy
>0
Current unbalance principle
Voltage unbalance is expressed as a % in relation to the arithmetic mean of the
corresponding voltage:
U
avg
=
U12 + U23 + U31
3
U
pg
unbalance =
U
pg
- U
avg
x 100 with pg = 12, 23, 31
U
avg
U12
U23
Umoy
U12 - Umoy
<0
U23 - Umoy
>0
Voltage unbalance principle
- HTD210H display: Reset all min/max values and energy counters.
- HTP610H configuration tool: Reset all min/max values and energy counters.