ABB RELION 670 Series Installation Manual page 74

Section 6
Connecting
68
REX061 Capacitor unit connections
Table 16: Injection and rotor connection X1
No
1 Rotor positive pole
2 -
3 Positive pole
4 -
5 Negative pole
6 -
7 Rotor negative pole
8 -
9 Rotor injection
10 Injection earth. Internally connected to chassis and PE
Table 17: Measurment connector X2
No
1 Rotor + voltage divided by 1 000
2 Earth
3 Rotor - voltage divided by 1 000
X1 connector. Connect each signal connector terminal of screw compression type
2
with one 0.14 to 6 mm
(AWG 35 - AWG 15) wires.
X2 connector. Connect each signal connector terminal of screw compression type
2
with one 0.5 to 2.5 mm
(AWG 24 - AWG 18) wires.
Protective conductor terminal must be connected to the cubicle or station protective
earthing system. Electrical codes and standards require that protective earth cables
are green/yellow conductors with a cross section area of at least 2.5 mm
14). 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
The protective earthing terminal is also the functional earth terminal. The
functional earth is the reference for rotor injection and measurement. The
connection to the generator earthing, and also to the station, should be as short and
low impedance as possible to reduce unwanted disturbances and improve the
quality of rotor measurements.
Signal
Signal
(AWG 35 - AWG 3) wire or with two 0.14 to 1.5 mm
(AWG 24 - AWG 14) wire or with two 0.5 to 1.0 mm
1MRK 514 026-UEN B
2
2
2
(AWG
2
(AWG 12).
670 series 2.2 IEC
Installation manual