ABB REG670 Applications Manual

4.2.4.2 Examples how to connect, configure and set VT inputs for most
commonly used VT connections
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)
U
Pri
+
+
U
Sec
a)
en06000591.vsd
IEC06000591 V1 EN
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-
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.
4.2.4.3 Examples on how to connect a three phase-to-earth connected VT to
the IED
Figure
25 gives an example on how to connect a three 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.
Section 4 1MRK 502 071-UEN -
Analog inputs
82 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual

ABB REG670 Specifications

General

Brand	ABB
Model	REG670
Category	Protection Device
Language	English