Examples On How To Connect, Configure And Set Ct Inputs For Most Commonly Used Ct Connections - ABB Relion 670 Series Applications Manual

Section 4
Analog inputs
4.2.2.4 Examples on how to connect, configure and set CT inputs for most
commonly used CT connections
Figure 12
world:
a)
IEC06000641 V1 EN-US
Figure 12:
Where:
a)
b) and
c)
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.
66
defines the marking of current transformer terminals commonly used around the
In the SMAI function block, you have to set if the SMAI block is measuring
current or voltage. This is done with the parameter:
Voltage. The ConnectionType : phase -phase/phase-earth and GlobalBaseSel .
P1
(H1)
I
Sec
x
P2
(H2)
Commonly used markings of CT terminals
is symbol and terminal marking used in this document. Terminals marked with a square
indicates the primary and secondary winding terminals with the same (that is, positive)
polarity
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 is recommended to:
• use 1A rated CT input into the IED in order to connect CTs with 1A and 2A
secondary rating
• use 5A rated CT input into the IED in order to connect CTs with 5A and 10A
secondary rating
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(H2)
S1 (X1)
S2 (X2)
x
(H1)
b)
1MRK 511 401-UEN Rev. K
AnalogInputType : Current/
P2
S2 (X2)
S1 (X1)
P1
c)
en06000641.vsd
Bay control REC670
Application manual
SEMOD55055-296 v7