4.2.4.1 Example
SEMOD55055-47 v3
Consider a VT with the following data:
EQUATION1937 V1 EN-US (Equation 1)
The following setting should be used: VTprim=132 (value in kV) VTsec=120
(value in
V)
4.2.4.2 Examples how to connect, configure and set VT inputs for most
commonly used VT connections
SEMOD55055-60 v6
Figure
24 defines the marking of voltage transformer terminals commonly used around
the world.
A
(H1)
B
(H2)
b
(X2)
a
(X1)
A
(H1)
N
(H2)
n
(X2)
a
(X1)
b) c)
A
(H1)
N
(H2)
dn
(X2)
da
(X1)
d)
V
Pri
+
+
V
Sec
a)
ANSI11000175_1_en.vsd
ANSI11000175 V1 EN-US
Figure 24: 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-
ground
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:
1MRK 502 071-UUS A Section 4
Analog inputs
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 85
Application manual
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