Directional
detector
U1
I1
BLOCK
RELEASE
Blocking
logic
t
Timer
Low level
blocking
Figure 229: Functional module diagram
Directional detector
The Directional detector module compares the angle of the positive-sequence
current I1 to the angle of the positive-sequence voltage V1. Using the positive-
sequence voltage angle as reference, the positive-sequence current angle is
compared to the
Characteristic angle
setting. If the angular difference is within the
operating sector selected with the
Directional mode
setting, the On signal is sent to
Timer.
The operating sector is defined by the setting
Min forward angle
,
Max forward
angle
,
Min reverse angle
and
Max reverse angle
. The options that can be selected for
the Directional mode setting are “Forward” and “Reverse”.
The sector limits are always given as positive degree values.
The
Characteristic angle
setting is also known as Relay Characteristic
Angle (RCA), Relay Base Angle or Maximum Torque Line.
Protection functions 1MRS758755 C
468 REC615 & RER615
Technical Manual
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