ABB VD4 Installation And Service Instructions Manual page 26

V D 4 - INSTALLATION AND SERVICE INSTRUCTIONS
26
—
7. Maintenance
Scope of functional testing:
• Perform several switching operations under no
load, above all with circuit breakers seldom
operated in normal service.
• Switch off the charging motor (if fitted) and
discharge the spring energy store by ON/OFF
switching operations.
• Examine visual the condition of the lubrication on
rotary bearings, sliding surfaces, etc.
• Check the proper mechanical/electrical sequence
of the individual functions.
7.2.3
No inspection of the breaker pole above and beyond
the stipulations of section 7.2.1 is necessary.
7.3
7.3.1
If cleaning is found to be necessary during
inspections as set out in 7.2.1, the following
procedure is to be adopted:
• Prior to cleaning, the working area is to be isolated
and secured against reclosing where necessary in
accordance with the safety regulations of DIN
VDE/IEC.
• Cleaning of surfaces in general:
- Dry, lightly adhering dust deposits with a soft,
dry cloth.
- More strongly adhering contamination with
slightly alkaline household cleanser or
Isopropanol.
• Cleaning of the insulating material surfaces and
conductive components:
- Light contamination: with Isopropanol.
Wipe down after cleaning, using clean water, and dry
properly.
Note:
Use only halogen free cleansers, and in no case
1.1.1-trichloroethane, trichloroethylene or carbon
tetrachloride!
7.3.2
Servicing of the operating mechanism is to be
performed after the following number of operating
cycles:
• Breakers with rated short-circuit breaking
currents up to 50 kA and 63 kA after 2000
operating cycles. Prior to servicing, switch the
breaker off, and move it out of the panel (with
withdrawable breakers) or
• isolate the outgoing feeder (with stationary
mounted breakers).
Breaker pole
Servicing
Switching devices in general
Stored-energy spring mechanism
(Figures 9/1 to 9/4)
Observe the safety regulations.
Details of the servicing:
• Switch off the charging motor (if fitted), and
discharge the spring energy store by closing and
opening the breaker once.
• Replace parts subject to high climatic and
mechanical stresses as a precaution.
• For replacing highly stressed parts neutralize
basic tension of the spiral spring, state the rate.
Be careful when carrying out!
• Relubricate pawls, support shafts, sliding and
rotating bearing surfaces. Lubri cant: Isoflex Topas
NB 52.
• Check the fit of fasteners (e.g. locking pins) in
cranks, pins, bolts etc. Check the tightness of
fastening bolts.
• Always replace any spring lock washers, split pins
and other fasteners removed during the work with
new parts when reassembling the equipment.
• Check the general condition of the operating
mechanism and recharge the spring energy store.
• Perform comprehensive mechanical and electrical
functional tests.
• Observe the instructions on setting.
• Ensure that the bolted joints at the contact
locations of the conductor bar system and the
earthing connections are tight.
Note:
Above mentioned work may only be performed by
the after-sales service personnel of ABB or
adequately qualified personnel.
7.3.3 Breaker pole
The breaker pole with the vacuum interrupter is
maintenance-free up to reaching the permissible
number of vacuum interrupter operating cycles in
accordance with section 2.4.
Checking of the vacuum is only necessary when
there is good cause to suspect that force applied
externally to a pole tube has caused damage to the
vacuum interrupter inside.
If the pole tube is damaged or destroyed, it may be
necessary to replace the complete breaker pole.
The working life of the vacuum interrupter is defined
by the sum current limit corresponding to the
equipment data in individual cases in accordance
with section 4.9:
• When the sum current limit is reached, the
complete breaker poles are to be replaced.