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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.
P
Q
Non
tripping
area
Tripping
area
Pickup
Value
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.
Section 4
1MAC059074-MB A
Protection functions
720
615 series ANSI
Technical Manual
Содержание Relion 615 series
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