ABB REG316 4 Series - Page 24

ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. C
2-14
2.9.2. REX 011-1, -2
The injection transformers have the following ID’s (see Table 2.2
and Table 2.3):
- HESG 323 888 M11, M12 or M13 for REX 011-1
- HESG 323 888 M21, M22 or M23 for REX 011-2.
The injection transformers used for secondary injection of the
stator circuit have four injection voltage windings connected in
parallel or series to adjust the power to suit the particular
grounding resistor.
The value of the parallel resistor R'
Ps
, respectively the maximum
injection voltage determine the permissible injection voltage
R'
Ps
[mW]
Uis [V] Version
> 8 0.85 M11
> 32 1.7 M12
> 128 3.4 M13
Table 2.2 REX 011-1
R'
Ps
[W]
Uis [V] Version
> 0.45 6.4 M21
> 1.8 12.8 M22
> 7.2 25.6 M23
Table 2.3 REX 011-2
Always select the maximum possible injection voltage. For ex-
ample, for a grounding resistor R'
Ps
= 35 mW, Uis = 1.7 V is
used.
In the case of versions M11, M12 and M13, the impedance of
the connection between the injection transformer and the
grounding resistor R'
Ps
should be as low as possible. The
resistance of both connecting cables should not exceed 5% of
R'
Ps
, e.g. for a grounding resistor of R'
Ps
= 35 mW and a length of
the connecting cables of 2 ´ 2 m = 4 m, the cables must have a
gauge of 40 mm
2
.
Voltages Uir and Ui are the same as for REX 011.