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A Appendix
400A
Neutral
5A
transformer
P1
P2
S1
S2
+ 12
- 11 (Amplifier)
max. 10 cm
Shunt: 10 A/ 150 mV
Figure A-37 100–% Stator Earth Fault Protection
– with 20 Hz generator 7XT33 and band pass 7XT34
496
Excitation
20-Hz-
Bandpass
7XT34
1B1
1B4
1A1
Wiring
R
shielded
L
1A4
1A3
+ 31
7KG6
- 32
Wiring twisted and shielded
At gas turbines:
Injection of cold gas
temperature
Auxiliary-
20-Hz-
voltage
Generator
DC
1A1
+V
1A2
-V
7XT33
1A3
4A1
2A1
BE
2A3
3A2
3A3
4A3
3A1
max 200 V
7UM62
K15 +
K16
K17 +
V
Exc.
K18
AC
V
H
A(L1)
U
B(L2)
H
U
C(L3)
External
block
Device
operative
R13
R14
J8
J7
K13 +
K14
C53000-G1176-C149-3
TD2
TD3
V
E
I
EE1
TD1
7UM62 Manual
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