ABB Relion 670 series, Руководство по применению

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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 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.
4.2.4.3 Examples on how to connect a three phase-to-earth connected VT to the
IED
SEMOD55055-87 v8
Figure 20 gives an example on how to connect a three phase-to-earth connected VT to the IED.
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.
For correct terminal designations, see the connection diagrams valid for the
delivered IED.
1MRK 505 343-UEN B Section 4
Analog inputs
75
Application manual