ABB RER670 - Examples on How to Connect a Two Phase-To-Earth Connected VT to the IED

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)
U
Pri
+
+
U
Sec
a)
en06000591.vsd
IEC06000591 V1 EN-US
Figure 16: 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
The IED fully supports all of these values and most of them will be shown in the
following examples.
4.2.4.3 Examples on how to connect a two phase-to-earth connected VT to
the IED
SEMOD55055-87 v9
Figure
17 gives an example on how to connect a two phase-to-earth
connected VT
to the IED. It 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.
For correct terminal designations, see the connection diagrams
valid for the delivered IED.
Section 4 1MRK 506 375-UEN A
Analog inputs
56 Railway application RER670 2.2 IEC
Application manual