REG 316*4 1MRB520049-Uen / Rev. F ABB Switzerland Ltd
3-237
Design example:
U
Gen
= 8 kV
Assumed: I 5 A
Emax
£
Determination of the grounding resistors:
Condition 1:
RR
8kV
35A
924
Es Ps
+³
´
³W
Condition 2: R 130
Ps
³W
Assumed: R=150
Ps
W
Condition 3: R 4.5 150 675
Es
³´ =WW
Condition 4: R 700
Es
³W
In order to fulfil conditions 1, 3 and 4: R = 800
Es
W
Determination of the v.t.:
Assumed:
N
N
=
8kV
3100V
12
11
´
=
46188.
Condition 5 is fulfilled because:
1.2 n
N
N
0.8 n = 46.7 31.1
12
11
´³ ³ ´ ³ where
38.9
Ω150Ω800
Ω800
V1003
kV8
n =
+
´
´
=
The following values are permissible:
R=150
Ps
W
R=800
Es
W
NN 8kV3100V
12 11
=
Design instructions:
When supplied from a 110 V battery, the maximum power in-
jected into the stator circuit is 110 VA. The injection unit is
equipped with a converter to accommodate battery voltages
between 48 V and 250 V. The peak injection voltage is ±96 V.
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