ABB REG316 4 Series Operating Instructions Manual page 426

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