Alstom FKG1X, Instruction Manual

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Function description Function description
FK 3-12 spring operating mechanisms FK 3-12 spring operating mechanisms
For circuit
For circuit brea breakers kers
06.04.2011 06.04.2011 48-020-212EN02 48-020-212EN02
6/15 6/15
Operating states Operating states
Note Note
• •
The The two ill two illustrations below ustrations below show the show the possible operating possible operating states and states and
sequences of an oper sequences of an oper ating mechanism. ating mechanism. These These are characterised are characterised
mains by the position of the circuit breaker to which mains by the position of the circuit breaker to which the the mechanism mechanism is is
attached, and by the position of the closing spring. The position of the attached, and by the position of the closing spring. The position of the
spring is always linked to the position of the circuit breaker. The
spring is always linked to the position of the circuit breaker. The
positions of the auxiliary switch and motor limit switch are important
positions of the auxiliary switch and motor limit switch are important
secondary characteristics.
secondary characteristics.
• •
An An operating operating mechanism mechanism remains remains in in a a steady steady operating state operating state until until its its
position is changed by an external control command. It can then pass position is changed by an external control command. It can then pass
through well-defined transient (unsteady) operating states.
through well-defined transient (unsteady) operating states.
Operating states and Operating states and
sequences
sequences
Operating state 3 Operating state 3
Steady Steady operating operating state state
Transient Transient operating operating state state
Closing spring charged Closing spring charged
Closing spring discharged Closing spring discharged
Circuit Circuit breaker breaker open open (trip (trip spring spring
discharged discharged
Circuit Circuit breaker breaker closed (trip closed (trip
spring charged) spring charged)
Closing spring is charged auto- Closing spring is charged auto-
matically
matically
Circuit Circuit breaker breaker is closed is closed
Circuit Circuit breaker breaker is tripped is tripped
CHARGING CHARGING
CHARGING CHARGING
CHARGING CHARGING
CHARGING CHARGING
and and
State of delivery State of delivery