ABB REG670 - Page 97

In case of a solid earth fault in high impedance earthed or unearthed systems the
primary value of Uo voltage will be equal to:
0
3
Ph Ph
Ph E
U
U U
-
-= =
EQUATION1931 V2 EN (Equation 11)
Figure 30 gives an overview of required actions by the user in order to make this
measurement available to the built-in protection and control functions within the IED.
L1 L2 L3
IED
6.6
3
100
kV
V
R
Uo
IEC06000603-4-en.vsdx
# Not Used
# Not Used
# Not Used
Protected Object
SMAI2
BLOCK
REVROT
^GRP2L1
^GRP2L2
^GRP2L3
^GRP2N
AI3P
AI1
AI2
AI3
AI4
AIN
1
2
3
4
5
IEC06000603 V4 EN
Figure 30: Neutral point connected VT
1MRK 502 071-UEN - Section 4
Analog inputs
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 91
Application manual