Alstom FKG1X - Page 74

Function descriptionFunction description
FK 3-12 spring operating mechanismsFK 3-12 spring operating mechanisms
For circuit For circuit
breabrea
kerskers
06.04.201106.04.2011
48-020-212EN0248-020-212EN02
15/1515/15
••
Trip latch Trip latch
70.16 is released 70.16 is released
by the electrical by the electrical
command to command to
trip magnettrip magnet
70.15 or by actuation of mechanical manual release 70.13. Main shaft70.15 or by actuation of mechanical manual release 70.13. Main shaft
70.12 and the circuit breaker, which is coupled to it, are accelerated in70.12 and the circuit breaker, which is coupled to it, are accelerated in
the O direction by charged trip spring 70.20, Trip dashpot 70.17 comesthe O direction by charged trip spring 70.20, Trip dashpot 70.17 comes
into action toward the end of the tripping process, slowing the movinginto action toward the end of the tripping process, slowing the moving
masses of the circuit breaker and operating mechanism to a stopmasses of the circuit breaker and operating mechanism to a stop
••
Control, indicating Control, indicating
and interlock and interlock
functions at functions at
the end the end
of the oof the o
peningpening
movement:movement:
−−
Auxiliary switch Auxiliary switch
70.21 Which i70.21 Which i
s coupled s coupled
to main to main
shaft 70.12 has shaft 70.12 has
bro-bro-
ken the opening release coil circuit and made the closing circuit.ken the opening release coil circuit and made the closing circuit.
Thus any further electrical actuation of the opening release coil isThus any further electrical actuation of the opening release coil is
prevented; an electrical closing operation is again possible.prevented; an electrical closing operation is again possible.
−−
A lever A lever
(not shown) controlled (not shown) controlled
by main by main
shaft 70.12 has shaft 70.12 has
again en-again en-
abled closing latch 70.05 for a subsequent closing operation. Theabled closing latch 70.05 for a subsequent closing operation. The
circuit breaker can be closed mechanically.circuit breaker can be closed mechanically.
−−
Circuit breaker Circuit breaker
position indicator position indicator
70.52 has 70.52 has
been turned been turned
to the to the
O po-O po-
sition with the main shaft.sition with the main shaft.
••
Circuit breaker Circuit breaker
and operating and operating
mechanism mechanism
are in are in
operating state operating state
22
Operating stateOperating state
2: steady2: steady
Motor ClosingMotor Closing
OpeningOpening
••
The The
circuit circuit
breaker ibreaker i
s s
ready ready
for for
closing.closing.