Siemens GMSG Instruction Manual page 13

Installation checks and functional tests
Automatic spring-charging check
Refer to the specific wiring information
and rating label for your circuit breaker to
determine the voltage required and where
the control-voltage signal should be
applied. Usually, spring-charging power is
connected to secondary-disconnect fingers
SD16 and SD15, closing control power to
SD13 and SD15 and tripping power to SD1
and SD2.
Note: Secondary-disconnect terminals are
numbered 1-16, from top to bottom.
When control power is connected to the
type GMSG vacuum circuit breaker, the
closing springs should automatically
charge, if the racking crank is not engaged.
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.
The automatic spring-charging features of
the circuit breaker must be checked.
Control power is required for automatic
spring-charging to take place.
1. Open control-power circuit by opening
the control-power disconnect device.
2. Install the circuit breaker end of the
split-plug jumper (if furnished) to the
circuit breaker as shown in Figure 5:
Split-plug jumper connected to circuit
breaker. The split-plug jumper is
secured over the circuit breaker
secondary contacts with knurled
thumb screws.
3. Install the switchgear end of the split-
plug jumper to the secondary-
disconnect block inside the switchgear
cubicle as shown in Figure 6: Split-plug
jumper connected to switchgear. The
jumper slides into place and
interconnects all control power and
signal leads (for example, electrical trip
and close contacts) between the
switchgear and the circuit breaker.
4. Energize (close) the control-power
circuit disconnect.
5. Use the close and trip controls (refer to
Figure 1: Type GMSG vacuum circuit
breaker front panel controls on page
8) to first close and then open the
circuit breaker contacts. Verify the
contact positions visually by observing
the OPEN/CLOSED indicator on the
circuit breaker.
6. De-energize control power by
repeating Step 1. Disconnect the split-
plug jumper from the switchgear
before disconnecting the circuit
breaker end.
7. Perform the spring discharge check
again. Verify the closing springs are
DISCHARGED and the primary contacts
of the type GMSG vacuum circuit
breaker are OPEN.
Final mechanical inspections without
control power
1. Make a final mechanical inspection of
the circuit breaker. Verify the contacts
are in the OPEN position, and the
closing springs are DISCHARGED.
2. Check the upper- and lower-primary
studs and contact fingers shown in
Figure 7: Circuit breaker primary
disconnect. Verify mechanical
condition of finger springs and the
disconnect studs, check for loose
hardware, damaged or missing
primary-disconnect contact fingers and
damaged disconnect studs.
3. Coat movable primary-contact fingers
(refer to Figure 7: Circuit breaker
primary disconnect) and the
secondary-disconnect contacts (refer
to Figure 23: Secondary disconnect on
the circuit breaker on page 28) with a
light film of Siemens contact lubricant
number 15-172-791-233.
4. The type GMSG vacuum circuit breaker
is ready for installation into its assigned
cubicle of the metal-clad switchgear.
Refer to removal procedures and install
the circuit breaker into the switchgear.
5. Refer to the switchgear instruction
manual for functional tests of an
installed circuit breaker.
Figure 5: Split-plug jumper
connected to circuit breaker
Figure 6: Split-plug jumper
connected to switchgear
Figure 7: Circuit breaker
primary disconnects
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