Connecting Injection Unit Rex060, Coupling Capacitor Unit Rex061 And Shunt Resistor Unit Rex062 And Signal Injection Transformer Sit - Hitachi 670 Series Installation Manual

1MRK514026-UUS Rev. P
1MRK002556-BA-2-PG V2 EN-US
Figure 40:
6.2.2 Connecting injection unit REX060, coupling capacitor unit REX061
and shunt resistor unit REX062 and Signal Injection Transformer
SIT
The injection unit REX060 should be installed close to the IED in the same cubicle, or at maximum within
10 m distance from the IED.
Table 11:
Location
Wiring inside the protection cubicle
The coupling capacitor unit REX061 should be mounted close to the generator in order to limit the
exposure of the field circuit. The protective earthing point (PE) of the REX061 case shall be earthed to
the same earth of the generator. REX061 is typically installed in the excitation cubicle if the cubicle is
close to the generator. REX061 should be connected as a permanently connected equipment. The wiring
of REX061 should be carried out according to the guidelines in the
Table 12:
Location
Between REX060 and REX061
Between REX061 and field winding
670 series
Installation manual
Shunt resistor module
Guidelines for connection cables between REG670 and REX060
Guidelines for connection cables for REX061
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Guideline
Dedicated two-core cable with cross section at least 1.5
2
mm .
Table 12.
Guideline
Shielded twisted pair cable with cross section 1.5 mm
14 AWG), lay length not longer than 71 mm, coverage of
the shield at least 85%, rated voltage at least 600 V AC
and voltage test at least 2 kV AC for 5 minutes. The cable
UL2586-SB TEW 2X14AWG(41/0.26)LF by Hitachi or an
equivalent cable shall be used. The installation of this cable
shall be according to a proper EMC design, considering
that it is a measurement cable with low current and low
voltage signals.
This cable should have cross section of at least 1.5 mm
and its rated voltage should be selected according to the
excitation system ceiling voltage.
Section 6
Connecting
GUID-0B6A1CDE-9CDE-413C-9E85-9314175D901E v6
2
(or
2
59