Connecting The Power Supply Module; Connecting To Ct And Vt Circuits - ABB RELION 670 Series Installation Manual

Section 6
Connecting
6.1.3
6.1.4
52

Connecting the power supply module

The wiring from the cubicle terminal block to the IED terminals (see Figure
PSM connection diagram) must be made in accordance with the established
guidelines for this type of equipment.
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 proper electrical contact between the printed circuit board and the
external wiring connected to the screw terminal block.
The auxiliary power wiring should have a minimum cross-sectional area of 1.0
2
mm 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.

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
a stranded conductor with a cross section area between 2.5-4 mm
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
and voltage transformer circuits are so called "feed-through IED blocks" and are
designed for conductors with cross sectional area up to 4 mm
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
Screw compression type
Terminal blocks suitable for
ring lug terminals
"Rear side
Rated voltage and current
250 V AC, 20 A
250 V AC, 20 A
1MRK 514 026-UEN B
SEMOD128790-5 v6
20
M11991-6 v3
2
(AWG14-10) or
2
(AWG14-12).
M11991-10 v4
connectors") for current
2
(AWG 12). The
SEMOD53376-2 v6
Maximum conductor area
2
4 mm (AWG12)
2
2 x 2.5 mm (2 x AWG14)
2
4 mm (AWG12)
670 series 2.2 IEC
Installation manual
for