Connecting Injection Unit Rex060, Coupling Capacitor Unit Rex061 And Shunt Resistor Unit Rex062 - ABB RELION 670 Series Installation Manual

1MRK514024-UEN A
6.2.2 Connecting injection unit REX060, coupling capacitor unit
REX061 and shunt resistor unit REX062
The injection unit REX060 should be installed close to the IED in the same cubicle, or at
minimum within 10 m distance of the IED.
The coupling capacitor unit REX061 should be mounted close to the generator in order to limit
the exposure of the field circuit. Alternatively it can be located in the excitation cubicle. REX061
should be connected as a permanently connected equipment. The connection cables should be
at least 1.5 mm
voltage 800 V
The shunt resistor unit REX062, if used in the application, should preferably also be installed in
the same cubicle as REX060.
Connecting to protective earth
Connect the protective earthing screw on the rear of each unit to the closest possible earthing
point in the cubicle. Electrical codes and standards require that protective earth cables are
green/yellow conductors with a cross section area of at least 2.5 mm
The cubicle must be properly connected to the station earthing system. Use a conductor with
a core cross section area of at least 4 mm
Connecting the power supply module
The wiring from the cubicle terminal block to the REX060 unit (see figure
connection diagram) must be made in accordance with the established guidelines for this type
of equipment. 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 it 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.
Connection examples
The figures below show typical installations for rotor and stator earth fault protection with
injection unit REX060 and coupling capacitor unit REX061. Some installations with and without
shunt resistor unit REX062 are also shown.
Installation manual
2
(16 AWG) at rated rotor injection voltage 250 V and rated field injection
.
DC
For information on type, cross section and maximum length of the cables refer
Connection diagrams in the REG 670 Technical Manual .
to section
2
(AWG 12).
Section 6
Connecting
GUID-0B6A1CDE-9CDE-413C-9E85-9314175D901E v4
2
(AWG 14).
32 for PSM
57