Mechanical Interlocks

Table 13 Functions and Method of Operation of Mechanical Interlocks

Interlocks	Function of interlock	Method of operation
LV plug interlock	LV plug cannot be removed when the EvoPacT HVX VCB is in the service condition.	The EvoPacT HVX VCB will activate and deactivate the interlock once the rack-in operation initiates.
Interchangeability interlock	The VCB other than EvoPacT HVX VCB cannot be inserted in the cubicle.	LV plug Pin code mismatches with other rating VCB.
E/S handle interlock	The E/S handle cannot be inserted when the cable compartment door is open.	The plunger on the interlock is pushed by the cable compartment door, access to the operating mechanism is closed. Refer to Figure 17.
Between EvoPacT HVX VCB	The EvoPacT HVX VCB cannot be racked-in when the E/S is ON.	The interlock lever blocks the truck from carrying out the rack-in/rack-out operations. Refer to Figure 18.
Between EvoPacT HVX VCB	The E/S cannot be switched on, if EvoPacT HVX VCB truck is in service position.
Between the cable compartment door and E/S	The cable compartment door cannot be opened when the E/S is OFF.	The E/S mechanism rotation activates the interlock in the cable compartment. Refer to Figure 19 and Figure 20.
Between the cable compartment door and E/S	The cable compartment door can be opened when the E/S is ON.
Between EvoPacT HVX VCB door and VCB truck	The EvoPacT HVX VCB cannot be racked-in when the VCB door is open.	The lever from EvoPacT HVX VCB truck gets engaged with the locking bracket on the VCB compartment front door. Refer to Figure 21. .
Between EvoPacT HVX VCB door and VCB truck	The EvoPacT HVX VCB can be racked-in when the VCB door is closed.


Figure 17 E/S Handle Interlock	Figure 18 EvoPacT HVX VCB Truck and the E/S Interlock

Figure 19 Cable Compartment Door and E/S Interlock, 12/17.5 kV	Figure 20 Cable Compartment Door and E/S Interlock, 24 kV

Figure 21 EvoPacT HVX VCB Door and VCB Truck Interlock