ABB SF6 LTB 245E1 BLG 1002A Product Manual page 141

Overhaul Instructions
1HSB435409-201 enrev1
Work requires training and product knowledge and may only be carried
out by authorised personnel.
Risk
Working close to high-voltage.
Working on ladders and platforms.
Working with low voltage.
Both alternating (AC) and direct (DC)
current can be routed to the
operating mechanism.
Risk of crushing in the operating
mechanism and link system.
There is stored energy in both the
opening and closing springs. The
mechanism can be tripped by heavy
vibrations or by unintentional contact
with mechanical latch components.
Working close to pressurised
insulators.
The normal working pressure is up to
0.8 MPa. Damage to the porcelain
can result in splintering.
WARNING
Isolate and earth close to the work
place. If work must be carried out
close to live installation components,
the safety distance applying in the
country's applicable safety
regulations must be observed.
Work shall be carried out in
accordance with applicable safety
regulations in the country concerned.
Difficult weather conditions that
require short shifts with a great deal
of climbing on ladders and platforms,
should be avoided.
Switch off the control voltage and if
necessary the heating voltage.
Operate the circuit-breaker to the
open position. Isolate and earth the
high-voltage side. Unload the springs
by switching off the motor current
and perform a Close-Open operation
or move the operating mechanism's
drive shaft backwards by hand (see
the Product Information for the
operating mechanism). For reasons
of safety the closing springs must be
unloaded during transportation as
well as during assembly and storage.
Work close to the circuit-breaker's
insulators that may result in damage
to the porcelain, must not be carried
out until the gas has been emptied to
max. 0.125 MPa (abs.) pressure.
Safety
Measure
5