SecoGear 24kV-27kV Air Insulation Switchgear
9
Description of the interlock system Key Condition
Functional truck racking-in lock
Key will be free when the truck in the disconnect position
Key will be trapped when the truck in the rack-in position
Earthing switch closing lock
Key will be free when the Earthing switch is open
Key will trapped when the earthing switch in closed position
Earthing switch opening lock
Key will be free when the Earthing swi
tch closed
Key will trapped when the earthing switch in open position
Figure : Functional truck racking-in lock
Figure 2/5: Earthing switch in open position
Figure 2/6: Earthing switch in close position
Key lock is locked, key is free, Truck indisconnect position
Key lock can't be locked when truck in rack in position, and key is trapped
When earthing switch in open position, earthing switch can be locked by closing lock, the key of closing lock can be free. And openi
ng
lock can't be locked, the key of opening lock is trapped.
When earthing switch in close position, earthing switch can be locked by opening lock, the key of opening lock can be free. And closing
lock can’t be locked, the key of closing lock is trapped.
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