ABB REG316 4 Series - Page 69

REG 316*4 1MRB520049-Uen / Rev. F ABB Switzerland Ltd
3-31
Protected
unit
I
1
I
3
I
2
Operation
Operation for
or
I
H
I
N
I
D
I
N
Restraint
123
b
g
v
1
2
3
I'
1
I
N
< b
I'
2
I
N
< b
HEST 965 007 C
IIII
D
=++
12 3
Operating
(differential) current
I
II
H
=
×× ³
<
ì
í
ï
î
ï
ü
ý
ï
þ
ï
''cos
12
0
00
aa
a
for cos
for cos
Restrain current
()
where I
IIIII
II
',,
''
'; '
1123
21231
12
=
=++-
=Ð -
greatest of I I I
a
Fig. 3.5.1.1 Operating characteristic: Diff-Transf