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Vehicle function and operational
interlocks
A type GMSG vacuum circuit breaker is
comprised mainly of the vacuum interrupter/
operator module fitted to a vehicle. This
vacuum interrupter/operator module is an
integral arrangement of operating
mechanism, dielectric system, vacuum
interrupters and means of connecting the
primary circuit. The vehicle supports the
vaccum interrupter/operator module,
providing mobility and fully coordinated
application in Siemens type GM-SG or type
GM-SG-AR switchgear.
Successful coordinated application of the fully
assembled type GMSG vacuum circuit breaker
is achieved through precise alignment in
fixtures during manufacture, and important
functional interlocking.
Alignment
All aspects of the circuit breaker structure
impacting alignment and interchangeability
are checked using master fixtures at the
factory. Field adjustment will not normally be
required.
Interlocks
Circuit breaker racking-interlocks
The vacuum interrupter/operator module, the
vehicle portion of the circuit breaker and the
racking mechanism in the switchgear all
cooperate to provide important operational
interlocking functions.
1. Rating interlock
The rating interlock consisting of a coded-
interference plate is mounted on the
vehicle (refer to Figure 28: Circuit breaker
interlocks and ground disconnect on page
29).
A mating-interference blocking plate is
mounted in the drawout compartment
(refer to Figure 29: Circuit breaker
compartment (up to 50 kA shown) on
page 30).
The two plates are mounted in alignment
and must pass through each other in order
for the circuit breaker vehicle to enter the
drawout compartment. The interlock is
coded to test rated voltage, as well as
interrupting and continuous current
ratings.
1.0
1.0
Ground disconnect
2.0
Racking mechanism release handle
3.0
Trip-free interlock
4.0
Closed circuit breaker racking interlock
Figure 30: Interlock mechanisms on the type GMSG vacuum circuit breaker
A. Type GMSG (not type GMSG-GCB)
circuit breaker rating interlock
Type GMSG (not type GMSG-GCB)
vacuum circuit breakers rated up to 50
kA are designed such that a single
circuit breaker of the maximum ratings
(voltage, interrupting rating and
continuous current) can be installed in
any switchgear compartment. For
example, a type GMSG circuit breaker
rated 15 kV, 50 kA interrupting and
3,000 A continuous current can be
installed in any type GM-SG circuit
breaker cell (except generator circuit
breaker cells) of equal or lower ratings.
Type GMSG (not type GMSG-GCB)
vacuum circuit breakers rated 63 kA are
designed such that a circuit breaker can
be installed in any type GM-SG circuit
breaker cell (except generator circuit
breaker cells) rated 63 kA and of equal
or lower voltage and continuous
current ratings.
2.0
3.0
4.0
33
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