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

1MRK 511 358-UUS A
CTprim = 1000 (value in A)
•
CTsec = 5 (value in A).
•
4.2.2.4 Examples on how to connect, configure and set CT inputs for most
commonly used CT connections
Figure 24
a)
IEC06000641 V1 EN-US
Figure 24: Commonly used markings of CT terminals
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.
Application manual
defines the marking of current transformer terminals commonly used around the world:
In the SMAI function block, you have to set if the SMAI block is measuring current or
voltage. This is done with the parameter:
ConnectionType : phase -phase/phase-earth and GlobalBaseSel .
P1
(H1)
I
Sec
x
P2
(H2)
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!
AnalogInputType : Current/voltage. The
P2
(H2)
S1 (X1)
S2 (X2)
x
P1
(H1)
b)
S2 (X2)
S1 (X1)
c)
en06000641.vsd
Section 4
Analog inputs
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