ABB 615 series Technical Manual page 726

Section 4
Protection functions
720
Directional calculation
The Directional calculation determines the direction of the measured power. The
measured power is considered to be in the forward direction if the active power is positive,
else it is considered to be in the reverse direction.
If the polarity of the measured power is opposite to normal, the correction can be done by
setting Pol reversal to "True", which rotates the apparent power by 180 degrees.
Level detector
The Level detector compares the calculated value of the active power with a set Pickup
value. If the calculated value of the active power falls below Pickup value in the forward
direction or if the measured power is in the reverse direction, the Level detector enables
the Timer module.
GUID-A75F4E26-38FF-4D60-992A-01E9877ACED7 V1 EN
Figure 359: Operating characteristics of 32U with setting Pickup value
Timer
Once activated, the Timer activates the PICKUP output. The time characteristics are
according to DT. When the operation timer has reached the value of Trip delay time, the
TRIP output is activated. In a drop-off situation, that is, if the underpower condition
disappears before the operation delay is exceeded, the timer reset state is activated. If the
reset timer reaches the value set by Reset delay time, the operation timer resets and the
PICKUP output is deactivated.
Q
Non
Tripping
tripping
area
area
Pickup
Value
1MAC059074-MB A
P
Technical Manual
615 series ANSI