ABB REL670 2.2 IEC - Page 507

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 275.
= =
o o
0 , 90RCADir ROADir
0
3I
j = -
0 ref
ang(3I ) ang(3U )
- =
0 ref
3U U
0
3I cos× j
IEC06000648-4-en.vsd
IEC06000648 V4 EN-US
Figure 275: Characteristic for RCADir equal to 0°
The characteristic is for RCADir equal to -90° is shown in Figure 276.
IEC06000649_3_en.vsd
ref
U
= − =
 
90 , 90RCADir ROADir
0
3I
0
3 ⋅ ϕI cos
ϕ = −
0
(3 ) ( )
ref
ang I ang U
−
0
3U
IEC06000649 V3 EN-US
Figure 276: 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.
1MRK 506 369-UEN B Section 9
Current protection
Line distance protection REL670 2.2 IEC 501
Application manual