ABB RELION 670 Series Applications Manual page 88

Section 4
Analog inputs
4.2.4.7 Example on how to connect a neutral point VT to the IED
Figure 32
connection presents secondary voltage proportional to V
In case of a solid ground fault in high impedance grounded or ungrounded systems the primary
value of V
V
-
ph
=
V 0
3
EQUATION1932 V2 EN-US
Figure 32
available to the built-in protection and control functions within the IED as well.
Protected Object
B
A
R
ANSI06000603 V2 EN-US
Figure 32: Neutral point connected VT
82
gives an example on how to connect a neutral point VT to the IED. This type of VT
voltage will be equal to:
0
ph
=
V
-
ph Gnd
gives an overview of required actions by the user in order to make this measurement
C
6.6 kV
3
100 V
IED
2
13
AI07 (I)
14
15
AI08 (I)
16
17
AI09 (I)
18
3
19
AI10 (V)
20
1 21
AI11 (V)
22
23
Vo
AI12 (V)
24
to the IED.
0
BLOCK
^GRP2_A
# Not Used
^GRP2_B
# Not Used
# Not Used ^GRP2_C
^GRP2N
TYPE
4
1MRK 505 337-UUS A
SEMOD55055-232 v7
(Equation 11)
5
SMAI2
AI3P
AI1
AI2
AI3
AI4
AIN
ANSI06000603-2-en.vsd
Application manual