ABB RER620, Technical Manual

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1MAC309294-MB F
Section 4
Protection functions
RER620 261
Technical Manual
Figure 128: Configurable directional settings
Low level blocking
For reliable operation, signals levels should be greater than minimum level. If they are not
greater than minimum level, Timer is blocked. If the amplitude of the positive sequence
current amplitude is greater than
Min Trip Current value and positive sequence voltage
amplitude is greater than Min operate voltage value then enable signal is sent to the Timer.
Timer
Once activated the internal operate timer is started. The timer characteristic is according
to Definite Time (DT). When the Timer has reached the value of
Release delay time , the
RELEASE output is activated. If a drop-off situation happens, that is if operating current
moves outside operating sector or signal amplitudes becomes below the minimum level
before
Release delay time is exceeded, the timer reset state is activated. If drop off
continues for more than Reset delay time the Timer is deactivated.
Blocking logic
The binary input BLOCK can be used to block the function. The activation of the BLOCK
input deactivates RELEASE output and resets the Timer.
4.5.5.5 Application
The 32P function improves the possibility to obtain selective function of the overcurrent
protection in meshed networks. The 32P function is used to block or release other
overcurrent protection functions.
V
1
I
1
RCA=+45 deg
Max forward
angle
Min forward
angle
Max reverse
angle
Min reverse
angle
Backward
area
Forward
area
N
on
-ope
rat
ing
ar
ea
No
n-o
pe
rat
ing
ar
ea
Min operate voltage
Min operate current
Characteristic
Angle/
max torque line
zero torque line