27
35
80
50
34
43 (-RL2)
44 (-BT3)
39
42
101
30a
30b
105
102
108
107
106
103
3
104
5.6.2.2. Description of the locks for withdrawable VSC/P
contactors
– Electric lock which prevents the contactor being closed
when the truck is not in the racked-in and isolated
positions.
– Mechanical lock which prevents the contactor being
racked-in and out when it is closed and closing of the
contactor when the truck is not in the racked-in and
isolated positions.
– Electric lock which prevents closing of the contactor when a
fuse is missing or blown.
– Lock which prevents putting a contactor into service in an
enclosure preset for a circuit-breaker (*).
Fig. 11a
Fig. 11b - Locking devices on the racking-out truck
– Locking electromagnet on the contactor truck which when
there is no voltage, prevents racking-in or racking-out
(-RL2).
– Mechanical lock which prevents contactor racking-in if the
enclosure door is not closed (requires the same interlock in
the fixed part) (108).
– Mechanical interlock with earthing switch placed on the
enclosure - with earthing switch closed the contactor
cannot be racked-in and with the contactor racked-in or in
intermediate positions between racked-in and isolated, it is
not possible to close the earthing switch (34).
– Mechanical lock of the shutters when the contactor is
racked-out.
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