ABB Relion 670 2.0 IEC Series, Installation Manual

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The auxiliary power wiring should have a minimum cross-sectional area of 1.0 mm
2
and a voltage rating of 250 V. Branch circuit protection must be provided in the
auxiliary power supply wiring to the IED, and if necessary it must be possible to
disconnect manually from the power supply. Fuse or circuit breaker up to 6 A and 250
V should be close to the equipment. It is recommended to separate the instrument
transformer leads from the other cables, that is, they should not be run in the same
cable ducts or loom. The connections are made on connector X11.
6.1.4 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
16 .
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 9: 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)
6.1.5 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
27 , which is then plugged into the
corresponding male connector, see figure 28 , 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 17 , figure 21 and figure 23 .
Do not insert anything else to the female connector but the
corresponding male connector. Inserting anything else (such as a
measurement probe) may violate the female connector and prevent a
Section 6
1MRK514019-UEN A
Connecting
52 670 series 2.0 IEC
Installation manual