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REG 316*4 1MRB520049-Uen / Rev. F
Alternative 2 with grounding transformer
This arrangement is widespread in North America. The maxi-
mum current for the grounding transformer is chosen to ap-
proximately equal the capacitive component of the E/F current.
» I
I
Emax
C
U
= ´
w
´
´
GN
I
3
C
C
3
Rated data of the grounding transformer:
U
U
=
GN
1
n
3
U
= 100; 200; 400 V
2n
I
= I
1n
Emax
I
= I
2n
e
U
1
n
=
where I
I
e
E
max
U
2
n
The grounding resistor R
æ
U
U
=
GN
R
ç
e
è
U
3
I
E
max
U
=
GN
or for
U
1
n
3
2
U
=
R
2
n
e
U I
1
n E
max
Rated power of the grounding transformer:
S
= U
I
n
1n
1n
or 115;
connected to the secondary is give by
e
2
ö
2
n
÷
ø
1
n
ABB Switzerland Ltd
(see Fig.
3.5.11.5):
230;
460 V
3-127
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