ABB Relion REC670 Applications Manual page 81

1MRK 511 358-UEN A
In case of a solid earth fault in high impedance earthed or unearthed systems the primary
value of Uo voltage will be equal to:
U
Ph
=
U 0
EQUATION1931 V2 EN-US
Figure 24
available to the built-in protection and control functions within the IED as well.
Protected Object
L1 L2
R
IEC06000603 V4 EN-US
Figure 24: Neutral point connected VT
Application manual
-
Ph
=
U
-
Ph E
3
gives an overview of required actions by the user in order to make this measurement
L3
1
Uo
6.6 kV
3
100 V
IED
2
3
# Not Used
# Not Used
# Not Used
Analog inputs
(Equation 11)
5
SMAI2
BLOCK AI3P
REVROT AI1
^GRP2L1 AI2
^GRP2L2 AI3
^GRP2L3 AI4
^GRP2N AIN
4
IEC06000603-4-en.vsdx
Section 4
75