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

Section 6
Connecting
1MRK002556-BA-2-PG V2 EN-US
Figure 40: Shunt resistor module
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
2
mm (16 AWG) at rated rotor injection voltage 250 V and rated field injection 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 ground
Connect the protective grounding screw on the rear of each unit to the closest possible grounding
point in the cubicle. Electrical codes and standards require that protective ground 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 grounding 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
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 mm
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
58
For information on type, cross section and maximum length of the cables refer to
section Connection diagrams in the REG 670 Technical Manual .
2
(AWG 12).
1MRK 514 026-UUS F
GUID-0B6A1CDE-9CDE-413C-9E85-9314175D901E v4
.
DC
2
(AWG 14).
34 for PSM connection
2
and a voltage
670 series
Installation manual