ABB REG316 4 Series Operating Instructions Manual page 198

ABB Switzerland Ltd
Example
Turboalternator
V.t's
C.t's
U
GN
= ´ ´
X x
A d
3 I
GN
x ' U
d GN
= ´ ´
X
B
2
3 I
GN
The reactance settings referred to the protection ratings U
I become:
N
X
A
XA - Setting =
I
N
U
N
X
B
XB - Setting =
I
N
U
N
3-160
REG 316*4 1MRB520049-Uen / Rev. F
100 MVA; 12 kV;
x = 2.0; x ' = 0.25
d d
U
N 1
12000
3
K = =
u
U
100
N2
3
5000
= =
K 5000
i
1
K 12000
i
=
3 2 0 .
K ×
3 4800
u
K 0 25 . 12000
i
= ´
3
K 2 ×
3 4800
u
208 3 .
= - ´ = -
1 2 08 .
100
13 02 .
= - ´ = -
1 0 130 0 13 .
100
4.8 kA
= 120
5000
´ = . W
3 208 3
120
5000
´ = 13 02 W
3
120
N
=
.
.
and