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I
Sec
I
P
ri
S1 (X1)
P1
(H1)
P2
(H2)
S2 (X2)
P2
(H2)
P1
(H1)
x
x
a)
b)
c)
en06000641.vsd
S2 (X2)
S1 (X1)
IEC06000641 V1 EN
Figure 18:
Commonly used markings of CT terminals
Where:
a)
is symbol and terminal marking used in this document. Terminals marked with a dot indicates the
primary and secondary winding terminals with the same (that is, positive) polarity
b) and c) are equivalent symbols and terminal marking used by IEC (ANSI) standard for CTs. Note that for
these two cases the CT polarity marking is correct!
It shall be noted that depending on national standard and utility practices, the rated
secondary current of a CT has typically one of the following values:
•
1A
•
5A
However in some cases the following rated secondary currents are used as well:
•
2A
•
10A
The IED fully supports all of these rated secondary values.
4.2.3.4
Example on how to connect a wye connected three-phase CT set to the
IED
gives an example about the wiring of a wye connected three-phase CT set to the
IED. It gives also an overview of the actions which are needed to make this measurement
available to the built-in protection and control functions within the IED as well.
1MRK 511 286-UUS A
Section 4
Analog inputs
67
Application manual
Summary of Contents for REC650 ANSI
Page 1: ...Relion 650 series Bay control REC650 ANSI Application manual...
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Page 66: ...Section 3 1MRK 511 286 UUS A REC650 setting examples 60 Application manual...
Page 71: ...IED IED ANSI05000460 V2 EN 1MRK 511 286 UUS A Section 4 Analog inputs 65 Application manual...
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