Siemens 3AH Instructions, Installation, Operation, Maintenance - Page 19
Browse online or download pdf Instructions, Installation, Operation, Maintenance for Control Unit Siemens 3AH. Siemens 3AH 33 pages. Vacuum circuit breaker operator module
Also for Siemens 3AH: Installation Operation & Maintenance (20 pages), Instructions Manual (38 pages)
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Maintenance
High Speed Moving Parts. Can cause
serious injury.
Tripping spring is charged. If trip latch is
moved, the stored energy springs will dis-
charge rapidly.
Avoid physical contact with circuit breaker
parts subjected to sudden, high speed move-
ment.
4. Press the red Trip pushbutton after completing the con-
tact erosion check. Visually verify the Discharge con-
dition of the closing springs and that the circuit breaker
contacts are Open.
5. Press the black Close pushbutton. Nothing should hap-
pen. The manual spring check should demonstrate
smooth operation of the operating mechanism.
Electrical Control Checks
The electrical controls of the 3AH circuit breaker should be
checked during inspections to verify absence of any me-
chanical damage, and proper operation of the automatic
spring charging and Close and Trip circuits.
Unless otherwise noted, all of these tests are performed
without any control power applied to the circuit breaker.
Check of the Wiring and Terminals
1. Physically check all of the breaker wiring for evidence
of abrasion, cuts, burning or mechanical damage.
2. Check all terminals to be certain they are solidly at-
tached to their respective device.
Hazardous voltages and high-speed
mechanical parts.
Will cause death, severe personal injury, or
property damage.
De-energize before working on this
equipment.
Read instruction manuals, observe safety in-
structions and limit use to qualified person-
nel.
Automatic Spring Charging Check
(Control Power Required)
Repeat the automatic spring charging check described in
the section entitled Installation Checks and Initial Functional
Tests.
Table 3. Typical Vacuum Interrupter Contact Life Expectancy
Rated Max.
Interrupting
Voltage
Class
4.76kV
250MVA
4.76kV
350MVA
8.25kV
500MVA
15kV
500MVA
15kV
750MVA
15kV
1000MVA
38kV
1500MVA
4.76kV
31.5kA
4.76kV
40kA
4.76kV
50kA
8.25kV
40kA
15kV
20kA
15kV
25kA
15kV
31.5kA
15kV
40kA
15kV
50kA
27kV
25kA
38kV
31.5kA
Primary tasks of this check are:
1. The breaker is energized with control power for this
check.
2. Energize the control power source.
3. When control power is connected to the circuit breaker,
the closing springs should automatically charge. Vi-
sually verify that the closing springs are charged.
Note: A temporary source of control power and test leads
may be required if the control power source has not been
connected to the switchgear. When control power is con-
nected to the 3AH circuit breaker, the closing springs should
automatically charge.
Curve Number
Rated
Current
Graph
Curve
36kA
A
49kA
C
41kA
C
23kA
B
36kA
A
48kA
C
35kA
D
31.5kA
B
40kA
C
50kA
C
40kA
C
20kA
A
25kA
B
31.5kA
B
40kA
C
50kA
C
25kA
A
31.5kA
D
3
10
8
4
3
9
13
6
7
11
7
1
5
6
7
11
2
12
18