ABB REG316 4 Series - Page 426

ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. B
4-28
X
T
Z
N
X
d
Stable
S
N
X
X
X'
d
d
d
X
T
~
~
~
~
S
N
0B
A
Instable
Instable
Instable
Stable
Fig. 4.12 Stability limit of a generator/transformer set and the
characteristic of the 'Minreactance' protection func-
tion