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Section 4
Analog inputs
4.2.4.2
84
132
kV
110
V
3
3
EQUATION2016 V1 EN-US
The following setting should be used: VTprim=132 (value in kV) VTsec=110
(value in V)
Examples how to connect, configure and set VT inputs for most
commonly used VT connections
Figure
19
defines the marking of voltage transformer terminals commonly used
around the world.
+
+
U
U
Pri
Sec
a)
IEC06000591 V1 EN-US
Figure 19:
Commonly used markings of VT terminals
Where:
a)
is the symbol and terminal marking used in this document. Terminals marked with a
square indicate the primary and secondary winding terminals with the same (positive)
polarity
b)
is the equivalent symbol and terminal marking used by IEC (ANSI) standard for phase-to-
earth connected VTs
c)
is the equivalent symbol and terminal marking used by IEC (ANSI) standard for open delta
connected VTs
d)
is the equivalent symbol and terminal marking used by IEC (ANSI) standard for phase-to-
phase connected VTs
It shall be noted that depending on national standard and utility practices the rated
secondary voltage of a VT has typically one of the following values:
•
100 V
•
110 V
•
115 V
•
120 V
•
230 V
The IED fully supports all of these values and most of them will be shown in the
following examples.
a
A
A
(X1)
(H1)
(H1)
N
n
N
(H2)
(X2)
(H2)
b)
1MRK 506 369-UEN B
da
A
(X1)
(H1)
dn
B
(X2)
(H2)
c)
en06000591.vsd
Line distance protection REL670 2.2 IEC
Application manual
(Equation 1)
SEMOD55055-60 v6
a
(X1)
b
(X2)
d)
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