SecoGear 24kV-27kV Air Insulation Switchgear
19
Figure 4/8: Earthing switch operation warning
Close the earthing switch
Open the earthing switch
•
Check that the voltage presence indication on the low voltage
compartment is off.
•
Check other electrical interlock, if applicable, to allow the
operation.
•
(See figure 4/9) Lower the operating hole shutter and insert
the operating handle, and turn the handle 180
°
clockwise to
close the earthing switch.
Figure 4/9: Close earth switch
Figure 4/10: Open earthing switch
•
Ensure the earthing switch is fully closed.
Warning
Warning
Check the position indicator on low voltage compartment
door
Check the flag adjacent to the earthing switch operating
hole
Make sure the cable compartment is clear and without
any unexpected objects
Make sure the cable compartment door is closed
completely
•
Insert the earthing switch operating handle, and turn the
handle 180
°
counterclockwise to open the switch (See figure
4/10)
•
Check the mechanically interlocked label and indication light
to ensure the earthing switch is fully open
Interlocking of the switchgear
•
The circuit breaker can be closed only when fully engaged in
the test or service position
•
The control plug can be released when the circuit breaker is in
test or disconnected position. The secondary plug is latched
when the circuit is in service position (see figure 4/11)
Figure 4/11: Secondary plug latch
•
Front Break is released only when operating lever is inserted;
and operating lever cannot be inserted when undercarriage is
in test position
•
Undercarriage Interlock is released only when undercarriage
is in test position
•
Undercarriage and ES interlock insures undercarriage can be
in service position only when ES is OFF
•
Back Break insures ES can be switched only when back door
is closed
•
Back Door Interlock is released only when ES is ON
The earthing switch has been interlocked with the rear
cover of cable compartment and can be opened only when
the cover is closed.
If found the operation of earthing switch become hard, do
not apply the excessive force. This can cause damage to
the parts. Ensure the cover is properly secured and then
operate the earthing switch.
Contact the manufacturer, if the problem still exist.
