Example On How To Connect A Neutral Point Vt To The Ied - ABB REB670 Applications Manual

1MRK 505 337-UUS -
4.2.3.7
Protected Object
B
A
R
ANSI06000603 V2 EN
Figure 32: Neutral point connected VT
Application manual

Example on how to connect a neutral point VT to the IED

Figure 32 gives an example on how to connect a neutral point VT to the IED. This type of
VT 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 voltage will be equal to:
0
V
-
ph ph
= =
V 0 V
-
ph Gnd
3
EQUATION1932 V2 EN
Figure 32 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 as
well.
C
1
Vo
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
21
AI11 (V)
22
23
AI12 (V)
24
Section 4
Analog inputs
to the IED.
0
(Equation 11)
5
SMAI2
BLOCK
^GRP2_A
# Not Used
^GRP2_B
# Not Used
# Not Used
^GRP2_C
^GRP2N
TYPE
4
ANSI06000603-2-en.vsd
AI3P
AI1
AI2
AI3
AI4
AIN
89