ABB Relion 670 series, Руководство по установке и пусконаладке

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5.4.4 Connecting to CT and VT circuits
CTs and VTs are connected to the 24–pole connector of the Transformer input
module (TRM) on the rear side of the IED. Connection diagram for TRM is shown
in figure
23 .
Use a solid conductor with a cross section area between 2.5-6 mm
2
(AWG14-10)
or a stranded conductor with a cross section area between 2.5-4 mm
2
(AWG14-12).
If the IED is equipped with a test-switch of type RTXP 24, COMBIFLEX wires
with 20 A sockets must be used to connect the CT and VT circuits.
Connectors on TRM (for location see section "Rear side connectors" ) for current
and voltage transformer circuits are so called “feed-through IED blocks” and are
designed for conductors with cross sectional area up to 4 mm
2
(AWG 12). The
screws used to fasten the conductors should be tightened with a torque of 1Nm.
Connector terminals for CT and VT circuits, as well as terminals for binary input
and output signals, can be of either ringlug or compression connection type,
depending on ANSI/IEC standards, or customers choice.
Table 8: CT and VT circuit connectors
Connector type Rated voltage and current Maximum conductor area
Screw compression type 250 V AC, 20 A
4 mm
2
(AWG12)
2 x 2.5 mm
2
(2 x AWG14)
Terminal blocks suitable for
ring lug terminals
250 V AC, 20 A
4 mm 2 (AWG12)
5.4.4.1 Configuration for analog CT inputs
The secondary rated current of the CT (that is, 1A or 5A) determines the choice of
TRM in the IED. Two TRMs are available, One is dimensioned for an input current
of 5A and the other for an input of 1A. If the CT rated secondary current does not
match the TRM input current rating adjustments can be made in settings depending
on the tolerance of the TRM.
5.4.5 Connecting the binary input and output signals
Auxiliary power and signals are connected using voltage connectors. Signal wires
are connected to a female connector, see figure
34 , which is then plugged into the
corresponding male connector, see figure 35 , located at the rear of the IED. For
location of BIM, BOM and IOM refer to section "Rear side connectors" .
Connection diagrams for BIM, BOM and IOM are shown in figure 24 , figure 28
and figure 30 .
1MRK 502 029-UEN A
Section 5
Installing the IED
61
Installation and commissioning manual