ABB Relion 670 Series Applications Manual page 176

Section 8
Current protection
The protection will use the power components in the characteristic angle direction for
measurement, and as base for the inverse time delay.
The inverse time delay is defined as:
TDSN (3I 3V cos (reference))
=
t
inv
EQUATION2069 V1 EN-US
The function can be set
GlobalBaseSel : It is used to select a GBASVAL function for reference of base values.
RotResU : It is a setting for rotating the polarizing quantity (3V
parameter is set to 180 degrees by default in order to inverse the residual voltage (3V
calculate the reference voltage (-3V
quantity for directionality, it is important to set this parameter correctly.
With the setting
OpModeSel set to 3I0cosfi the current component in the direction equal to the characteristic
With
RCADir has the maximum sensitivity. The characteristic for RCADir is equal to 0° is shown in
angle
Figure 82.
ANSI06000648 V1 EN-US
Figure 82: Characteristic for RCADir equal to 0°
The characteristic is for
170
f
× × ×
0 0
f
×
3I 3V cos (measured)
0 0
Enabled/Disabled with the setting of Operation .
OpModeSel the principle of directional function is chosen.
V
RCA = 0°, ROA = 90°
ref
3I
= ang(3I
3I
RCADir equal to -90° is shown in Figure 83.
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-jRCADir
e ). Since the reference voltage is used as the polarizing
0
0
) - ang(3V )
0 ref
-3V =V
0 ref
cos
0
en06000648_ansi.vsd
1MRK 511 401-UUS F
) by 0 or 180 degrees. This
0
0
Bay control REC670
Application manual
(Equation 61)
) to