Hitachi Relion 670 Series Applications Manual page 142

Section 8
Current protection
TDSN (3I 3V cos (reference))
=
t
inv
EQUATION2069 V1 EN-US
The function can be set Enabled/Disabled with the setting of Operation.
GlobalBaseSel: To select a GBASVAL function for reference of base values.
RotResU: It is a setting for rotating the polarizing quantity (3V
set to 180 degrees by default in order to inverse the residual voltage (3V
voltage (-3V
is important to set this parameter correctly.
With the setting OpModeSel the principle of directional function is chosen.
With OpModeSel set to 3I0cosfi the current component in the direction equal to the characteristic
angleRCADir has the maximum sensitivity. The characteristic for RCADir is equal to 0° is shown in Figure
66.
ANSI06000648 V1 EN-US
Figure 66:
The characteristic is for RCADir equal to -90° is shown in Figure 67.
136
f
× × ×
0 0
f
×
3I 3V cos (measured)
0 0
-jRCADir
e ). Since the reference voltage is used as the polarizing quantity for directionality, it
0
V
RCA = 0°, ROA = 90°
ref
3I
= ang(3I
3I
Characteristic for RCADir equal to 0°
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) by 0 or 180 degrees. This parameter is
0
0
) - ang(3V )
0 ref
-3V =V
0 ref
cos
0
en06000648_ansi.vsd
1MRK511407-UUS Rev. N
(Equation 55)
) to calculate the reference
0
Phasor measurement unit RES670
Application manual