V
1
I
1
RCA=+45 deg
Max forward
angle
Min forward
angle
Max reverse
angle
Min reverse
angle
Backward
area
Forward
area
Min operate voltage
Min operate current
Characteristic
Angle/
max torque line
zero torque line
Figure 230: 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.
4.6.1.5 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.
1MRS758755 C
Protection functions
REC615 & RER615
Technical Manual
469
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