GE Multilin
B90 Low Impedance Bus Differential System
9-9
9 THEORY OF OPERATION
9.6 OUTPUT LOGIC AND EXAMPLES
9
Figure 9–9: EXTERNAL FAULT EXAMPLE
836735A1.CDR
T
h
e
bus
dif
fer
ential
pr
otec
tion
element
pic
k
s
up
due
to
heav
y
CT
s
a
tur
ation
T
h
e
C
T
s
atur
ation
flag
is
s
e
t
s
afely
befor
e
the
pic
k
u
p
flag
T
h
e
e
lement
does
not
maloper
ate
Th
e
dir
ec
tional
flag
is
not
s
e
t
0.
06
0.
07
0.
08
0.
09
0.
1
0.
11
0.
12
-200
-150
-100
-5
0
0
50
100
150
200
~1
ms
Des
pite
heav
y
C
T
s
a
tur
ation
the
ex
ter
nal
fault
c
u
rr
ent
is
s
een
in
the
oppos
ite
dir
e
c
tion
Summary of Contents for B90 UR Series
Page 316: ...A 4 B90 Low Impedance Bus Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 406: ...B 90 B90 Low Impedance Bus Differential System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Page 436: ...C 30 B90 Low Impedance Bus Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 446: ...D 10 B90 Low Impedance Bus Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...