FUNCTION CHARACTERISTICS
33
NA30 - Manual - 04 - 2022
• Minimum (
I
L1MIN
,
I
L2MIN
,
I
L3MIN
, ±
P
MIN
, ±
Q
MIN
)
Inside an adjustable time interval
t
ROL
, the minimum magnitude is calculated for phase currents
I
L1
,
I
L2
,
I
L3
, active power ±
P
and reactive power ±
Q
of measures taken every second. The average values
are stored at the end of the same time interval
t
ROL
(Rolling demand common parameter).
Use of over-described measures is shown in the following tables.
Conventions
Phase rotation direction
The conventional rotation direction for the current phasors is counter-clockwise.
Cyclic phase sequence order
For three phase rotating currents, a direct cyclic sequence is defined when the three phases are
L1, L2, L3 ordered, while an inverse cyclic sequence is defined when the three phases are L1, L3, L2
ordered.
Min-Demand.ai
Minimum value of averaged inside time interval
t
ROL
Average inside time interval
t
ROL
Reset
I
L1MIN
I
L 2MIN
I
L 3MIN
(
I
n
)
I
L2
I
L1
I
L3
1s
t
ROL
t
ROL
t
ROL
t
ROL
t
ROL
t
ROL
MIN
I
L xMIN
=
I
L xn
t
ROL
∙60
t
R OL
∙60
n=1
∑
1
fasori.ai
fasori1.ai
U
L1
U
L3
U
L2
U
L1
U
L2
U
L3
Direct sequence cyclic order
Inverse sequence cyclic order
