ABB RELION 650 Series Applications Manual page 122

Section 7
Current protection
kSN (3I 3U
=
t
inv
EQUATION1942 V2 EN-US
The function can be set
Common base IED values for primary current (IBase), primary voltage (UBase) and primary
power (SBase) are set in a Global base values for settings function GBASVAL.
GlobalBaseSel : It is used to select a GBASVAL function for reference of base values.
RotResU : It is a setting for rotating the polarizing quantity ( 3U
parameter is set to 180 degrees by default in order to inverse the residual voltage ( 3U
calculate the reference voltage (-3U
polarizing quantity for directionality, it is important to set this parameter correctly.
With the setting
OpMode 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
angle
in Figure 56.
IEC06000648 V4 EN-US
Figure 56: Characteristic for RCADir equal to 0°
The characteristic is for
116
× × × j
cos (reference))
0 0
× × j
3I 3U cos (measured)
0 0
On/Off with the setting of Operation .
OpMode the principle of directional function is chosen.
3I
0
j =
ang(3I ) ang(3U
3I cos
RCADir equal to -90° is shown in Figure 57.
-jRCADir
e ). Since the reference voltage is used as the
0
o
= =
RCADir 0 , ROADir 90
-
)
0 ref
- =
3U U
0 ref
× j
0
IEC06000648-4-en.vsd
) by 0 or 180 degrees. This
0
o
Application manual
1MRK 504 158-UEN A
(Equation 47)
) to
0