ABB RES670 Applications Manual page 160

Section 8
Current protection
154
With OpMode 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 62.
IEC06000648 V4 EN-US
Figure 62: Characteristic for RCADir equal to 0°
The characteristic is for RCADir equal to -90° is shown in Figure 63.
U
ref
3 ⋅ I cos ϕ
0
IEC06000649 V3 EN-US
Figure 63: Characteristic for RCADir equal to -90°
When OpMode is set to 3U03I0cosfi the apparent residual power component in the
direction is measured.
When OpMode is set to 3I0 and fi the function will operate if the residual current is
larger than the setting INDir> and the residual current angle is within the sector
RCADir ± ROADir.
o
=
RCADir 0 , ROADir
3I
0
j = -
ang(3I ) ang(3U )
0 ref
-
3U
× j
3I cos
0
IEC06000648-4-en.vsd

RCADir = − 90 , ROADir = 90
3I
0
ϕ = ang I (3 ) − ang U ( )
0 ref
− 3U
0
IEC06000649_3_en.vsd
1MRK 511 407-UEN C
o
=
90
=
U
0 ref

Phasor measurement unit RES670 2.2 IEC
Application manual