Connection Examples - Siemens 7XT3300-0 A00/DD Series Manual

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Connection Examples

Figure 9 Connection of the 7XT33 to a DC-voltage supply via a 2-A protective switch
to Generator
Step-up Transformer
Earthing
Transformer
U
N
3
Generator
a b
Neutral
Transformator
U /√3
NG
500 V
Figure 10 Connection of the 100 % stator earth protection with earthing or neutral
transformer
24
500 V
3
a
400 A / 5 A
R
1FS5
b
15 VA
P1
P2
S2 S1
Burden < 0.5 Ω
Note
To ensure proper functioning of the 20-Hz protection principle, the load
resistance R must be > 0.5 Ω.
L
max. 3 A (20 Hz)
> 0.5 Ω
L
7XT3300-0*A00/DD
Protection Cubical
20-Hz Bandpass
7XT34
1B 1 1B4
1A4
660 Ω
660 Ω *1
330 Ω
1 A1
1A2 1A 3
*1: Line twisted
C53000-B119U-C129-1
20-Hz Generator
7XT 33
11
20 Hz
12
7UM62
R 13 U
E
R 14
J8
I
EE1
J7