Application - ABB RELION Series Technical Manual

1MRS758755 A
4.6.1.5
REC615 and RER615
Technical Manual
Min reverse
angle
Backward
area
Min operate voltage
Max reverse
angle
Min operate current
GUID-F08570BC-073C-4911-B082-091D652F7E35 V1 EN
Figure 231: Configurable directional settings
Low-level blocking
For a reliable operation, signal levels should be greater than the minimum level. If they
are not greater than the minimum level, Timer is blocked. If the amplitude of the
positive-sequence current is greater than the Min operate current value and the
positive-sequence voltage amplitude is greater than the Min operate voltage value, the
On signal is sent to Timer.
Timer
Once activated, the internal operating timer is started. The Timer characteristic is
according to definite time DT. When Timer has reached the value of Release delay
time, the RELEASE output is activated. If a drop-off situation happens, that is, if the
operating current moves outside the operating sector or signal amplitudes drop below
the minimum level before Release delay time is exceeded, the Timer reset state is
activated. If the drop-off continues for more than Reset delay time, Timer is
deactivated.
Blocking logic
The binary input BLOCK can be used to block the function. The activation of the
BLOCK input deactivates the RELEASE output and resets Timer.

Application

The three-phase power directional element DPSRDIR improves the possibility to
obtain a selective function of the overcurrent protection in meshed networks. The
function is used to block or release other overcurrent protection functions.
V
1
Characteristic
RCA=+45 deg
Angle/
Max forward
max torque line
angle
I
1
Min forward
Forward
angle
area
zero torque line
Section 4
Protection functions
455