ABB REG316 4 Series Operating Instructions Manual page 69

REG 316*4 1MRB520049-Uen / Rev. F
I
D
I
N
3
Operation
2
1
v
g
b
1
Protected
I
1
= + +
I I I I
D
1 2 3
ì
× ×
I I ' ' cos
ï
1 2
=
I
í
H
î ï
0
where I ' = greatest of I I I
1
= +
I ' I
2 1
(
a = Ð
Fig. 3.5.1.1 Operating characteristic: Diff-Transf
Operation for
I'
1
< b
I
N
or
I'
2
< b
I
N
Restraint
2 3
I
2
unit
I
3
ü
a a ³
for cos 0
ï
ý
þ ï
a <
for cos 0
, ,
1 2 3
+ -
I I I '
2 3 1
)
-
I ' ; I '
1 2
ABB Switzerland Ltd
I
H
I
N
HEST 965 007 C
Operating
(differential) current
Restrain current
3-31