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Manual Operations
Motor-wound spring operating mechanism FK3-07
for outdoor circuit breaker
26.04.2011
© ALSTOM
Introduction
• The following manual operations are described in these instructions:
– Slowly switch on.
– Slowly switch off.
– Manually discharge the closing spring.
• Manual operations according to these instructions are not necessary
during mounting work and normal circuit breaker operation.
• Slow switching on or off can be carried out, as required, when setting and
inspecting the circuit breaker.
• After incorrect manipulation or malfunctions of the circuit breaker, slow
switching on and / or off may be carried out in order to rectify the malfunction
and the closing spring can be discharged manually.
Prerequisite
for carrying out
manual
operations
Safety precautions
• The motor-wound spring operating mechanism 70.00 FK3-07 has a state-
of-the-art design and is operationally safe. Nonetheless, hazards can
emanate from this apparatus if it is used improperly.
• In view of this, the operators of circuit breakers must ensure the following
as regards the staff they employ:
– Specialist knowledge of the local as well as customary national safety
provisions and accident prevention regulations, especially those
concerning high-voltage installations and apparatus
– Familiarity with and observance of the content of the instructions at hand
– Sound technical training on circuit breakers, including motor-wound
spring operating mechanisms
– Observanceofthesafetyprecautionsafxedtotheapparatus
– Commitment to immediately report the occurrence of changes that
jeopardize safety
• The circuit breaker is in the position OFF.
• The circuit breaker is earthed on both sides.
• The control voltage is switched off.
Standards,
regulations
• The AIS circuit breakers and apparatus supplied by Alstom have been
developed, tested and built according to IEC62271-1, -203, -100, -102 etc.
Environmental
management
• The procedures depicted in ISO 14001 are used by Alstom.
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