clockwise sector, a measurement from the
Characteristic angle setting that has
been rotated 180 degrees.
Relay characteristic angle (RCA) is set positive if the operating current lags the
polarizing quantity and negative if the operating current leads the polarizing
quantity.
Figure 469: Configurable operating sectors
The angle difference ANGLE between the negative-sequence current and the
polarizing quantity is calculated as shown below and is available in the Monitored
data view.
ANGLE
U
I
RCA
=
−
(
)
−
( )
−
φ
φ
φ
2
2
(Equation 235)
Based on the ANGLE value, the direction information DIRECTION is evaluated and is
made available in the Monitored data view.
Table 745: Momentary direction value for monitored data view
Criterion for direction information
Value for DIRECTION
ANGLE_X is not in any of the defined sectors,
or the direction cannot be defined due too
low amplitude
0 = unknown
ANGLE_X is in the forward sector
1 = forward
ANGLE_X is in the reverse sector
2 = backward
1MRS759142 F
Protection functions
REX640
Technical Manual
829