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ABB REQ650 User Manual

ABB REQ650
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I
Sec
I
P
r
i
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 25: 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 star connected three-phase CT set to the
IED
Figure
26 gives an example about the wiring of a star 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.
For correct terminal designations, see the connection diagrams valid
for the delivered IED.
Section 4 1MRK 505 291-UEN A
Analog inputs
66
Application manual

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ABB REQ650 Specifications

General IconGeneral
BrandABB
ModelREQ650
CategoryProtection Device
LanguageEnglish

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