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Siemens 38-3AH3 38 kV Instruction Manual page 29

Vacuum circuit breaker
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(+)
W
SD3
13
14
DC supply
(-)
SD11
SD12
88.0 - Spring-charging motor
52a
- Auxiliary switch is open when circuit
breaker is open
52b
- Auxiliary switch is closed when circuit
breaker is closed
52SRC - Spring-release coil (close)
52T
- Shunt trip coil
52Y
- Closing relay (anti-pump)
G
- Green indicating light (trip)
LS
- Spring-charged switch
Vacuum interrupter/
operator
01
C
SD16
SD13
21
LS21
41
22
42
22
Motor
88
21
LS41
31
32
21
LS22
A1
22
A2
22
22
MI2
MI1
13
21
21
14
TB
1
2
3
4
5
6
SD15
SD9
54
64
101
91
52a
52a
52b
63
55
92
102
SD10
MI1, MI2 - Mechanical interlock
OI/C
- Control switch (close)
OI/T
- Control switch (trip)
R
- Red indicating light (closed)
W
- White indicating light (spring-
charged).
Standard:
Fuses in close circuit. Slugs in trip circuit (fuses
optional).
Shown with springs DISCHARGED, trip-latch
reset, circuit breaker OPEN, CONNECT or
WITHDRAWN position.
Figure 22: Typical elementary diagram
G
52b
SD4
21
14
52Y
LS3
52Y
22
13
31
52b
52Y
32
A1
52SRC
52Y
A2
SD14
LS9
SD7
SD5
74
84
111
52b
52a
52a
73
83
112
SD8
SD6
01
T
R
SD1
24
52a
23
A1
52T
A2
34
52a
33
SD2
121
52b
52b
122
29

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