Citadel 2.0 - Instruction Manual - page:
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Stored-energy operating mechanism;
The stored-energy operating mechanism of the circuit breaker is a balanced system
of springs, solenoid coils and mechanical devices designed to provide a number of
specific and critical functions.
The energy necessary to close and open the contacts of the
vacuum interrupters is stored in a powerful Closing spring and
somewhat smaller Opening springs.
Under normal operation, each time the Closing spring
discharges its energy, the breaker mechanism’s charging
motor will automatically recharge the Closing
spring. There are also provisions for manual
charging of the closing spring for emergency
conditions where control power is lost or
during manual charging for testing and
maintenance purposes.
“Trip-free” is a function specified in ANSI/
IEEE C37.04-1999, clause 6.9 which states
that the tripping function prevail over the
closing function. See ANSI/IEEE C37.04-
1999 for full details or consult the factory.
The Citadel vacuum breaker element
consists of three phases (AKA poles),
each with its own vacuum interrupter, which
is rigidly supported by a primary mounting
assembly. These three “pole assemblies”
are bolted to a common operating
mechanism housing. (Figure 15).
1
Closing Spring
2
Opening Spring
3
Main Armature Shaft
4
Main Drive rod
5
Main Shaft Linkage to Push Rods
5
5 4
3
1
2
5
Operating mechanism
The operating mechanism is comprised of the mechanical and electrical components
required to:
1.
Charge the closing spring to be able close the circuit breaker and simultaneously
store energy in the opening spring and contact pressure springs.
2.
A latching and triggering mechanisms to release closing and opening spring’s
actions.
3.
Means of transmitting the forces and motions to each set of vacuum interrupters.
within the pole assemblies.
4.
Operate all functions automatically by way of an electrical charging motor, a close
and open coil, cutout switches, anti-pump relay, and an auxiliary switch.
5.
Provide indication of the circuit breaker status (OPEN/CLOSED), spring condition
(CHARGED/DISCHARGED) and an operations counter.
FIGURE 15
C I T A D E L C O N T R O L S
