Siemens siprotec 7SJ63 - Page 241

Functions
6-777SJ63 Manual
C53000-G1140-C120-1
Figure 6-35 Logic Diagram for Sensitive Ground Fault Detection
SensGnd Forward
SensGnd Reverse
6HQV()DXOW
 1V'(/$<
 7'(/$<3LFNXS
 5(6(7'(/$<
>BLOCK 64
 93+0,1
9JQG25,1V
9JQG$1',1V
„1“
 38&5,7(5,$
T0
 93+0$;
V>
V<
V
a
V
b
V
c
V<
V>
&
V<
V>
V<
V>
&
&
V
0
Sens.Gnd Ph A PU
Sens.Gnd Ph B PU
Sens.Gnd Ph C PU
64 Pickup
&
&
&
 '(/$<
T0
64 TRIP
)ZG5HY
1RQ'LU
”1“
 1V',5(&7
)ZG5HY
1RQ'LU
“1“
 1V',5(&7
'HILQLWH7LPH
8VHU'HI&XUYHV
I
Ns
Direction
Determination
T0
&
T0
50Ns-2 TRIP
&
 1V'(/$<
T0
50Ns-1 TRIP
&
 1V7,0(',$/
51Ns TRIP
SensGnd Dir undef.
Sens.Gnd Gnd PU
50Ns-2
50Ns-2
or
=
=
or
or
&
&
&
50Ns-1 Pickup
50Ns-2 Pickup
51Ns Pickup
&
&
&
>BLOCK 50Ns-2
>BLOCK 50Ns-1
>BLOCK 51Ns
Alarm Only
Reset Measuring Device
3I
0
< 1.6 A
Measurement Logic
50Ns-1
51Ns
or
&
F# 1272
F# 1273
F# 1274
F# 1271
F# 1201
F# 1202
F# 1203
F# 1204
F# 1215
F# 1217
F# 1276
F# 1277
F# 1278
F# 1221
F# 1223
F# 1224
F# 1226
F# 1227
F# 1229
50Ns-1/51Ns
From
Figure
6-34
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