Examples On How To Connect A Three Phase-To-Earth Connected Vt To The Ied - ABB Relion REC670 Applications Manual

1MRK 511 358-UEN A
+
U
Pri
IEC06000591 V1 EN-US
Figure 19: Commonly used markings of VT terminals
Where:
a)
b)
c)
d)
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 20
It as well gives 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.
Application manual
+
A
(H1)
U
Sec
N
(H2)
a) b)
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
is the equivalent symbol and terminal marking used by IEC (ANSI) standard for phase-to-earth
connected VTs
is the equivalent symbol and terminal marking used by IEC (ANSI) standard for open delta
connected VTs
is the equivalent symbol and terminal marking used by IEC (ANSI) standard for phase-to-phase
connected VTs
gives an example on how to connect a three phase-to-earth connected VT to the IED.
For correct terminal designations, see the connection diagrams valid for the
delivered IED.
a da
A
(X1) (X1)
(H1)
dn
n N
(X2) (H2) (X2)
c)
Section 4
Analog inputs
a
A
(X1)
(H1)
B b
(H2) (X2)
d)
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