ABB UniSec Operation And Maintenance Manual page 28

28 U N I S E C O P E R AT I O N A N D M A I N T E N A N C E M A N U A L
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3. Switchgear operation
3.3.8 Cable testing
Fig. 59. Operating and signalling components
of HD4/sec circuit-breaker
3.3.8.1 Cable test position
a) Put operating lever into earthing seat.
b) Turn lever clockwise to "earthed" position.
c) Open cable compartment door.
d) Remove cover from control mechanism
compartment (see chapter 4.4.2).
e) Push locking plate to top position.
Fig. 60. "Earthed" position
CAUTION
The following tasks must only be carried
out by qualified personnel!
WARNINGS
Pay special attention to safety when
performing the following tasks!
Fig. 61. Locking plate Fig. 61. Locking plate
f) Put operating lever into earthing seat.
g) Turn lever counter-clockwise to "open" position.
The cables can now be tested.
After cable testing has terminated, work through
the previously described steps in reverse order.
3.3.8.2 Cable testing procedure for SBR functional
units
a) Open the circuit-breaker.
b) Close switch-disconnector.
c) Close earthing switch.
d) Open cable compartment door.
e) Open busbar compartment door.
f) By-pass the busbar compartment door interlock.
Use a tool to pull down the metallic interlock in
the busbar compartment above the operating
mechanism.
g) Open the earthing switch.
h) Open the bottom earthing switch of the cable
compartment.
Fig. 62. Interlock of busbar compartment door for SBR units