ABB VD4 Series Instruction Manual - page 32
32 VD4 Vacuum-circuit-breaker | Instruction manual 534/01
Note:
Isolate and secure the working area in accor-dance with the
safety regulations specified by DIN VDE/IEC.
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 storage mechanism 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.
8.2.3 Breaker pole
No inspection of the breaker pole above and beyond the
stipulations of section „Inspection, switching devices in
general“ is necessary.
8.2.4 Withdrawable assembly
- The inspection should always include a visual examination
of the withdrawable part assembly. Special attention is to
be paid to those parts which may possibly be damaged by
improper handling. (See section “Inspection/Circuit-breaker
in general“.)
- Visual checking of the isolating contact system. We recom-
mend turning the contact system alternately in order to
clean the inner contact points.
The contact points should be cleaned if signs of imper-
missible overheating (discoloured surface) are visible (see
section “Repairs“).
- The interlock conditions and the ease of movement of the
lock and release device are to be checked as described
under “Repairs“.
When checking the interlock conditions, it is essential to
ensure that no force is used.
Maximum torque 25Nm!
8.3
Servicing
8.3.1 Switching devices in general
If cleaning is found to be necessary during inspections as set
out in „Inspection, switching devices in general“, 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 alkali-
ne household cleanser or Rivolta BWR 210.
- Cleaning of the insulating material surfaces and conductive
components:
- Light contamination:
with Rivolta BWR 210.
- Strongly adhering contamination:
with cold cleanser 716.
Wipe down after cleaning, using clean water, and dry
properly.
- Observe the manufacturer’s instructions and the special
ABB Instruction Manuals BA 1002/E or BA 1006/E on
safety at work.
Note:
Use only halogen free cleansers, and in no case 1.1.1-trichlo-
roethane, trichloroethylene or car bon tetrachloride!
8.3.2 Stored-energy spring mechanism
Servicing of the operating mechanism is to be performed after
10,000 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).
Observe the safety regulations.!
Details of the servicing:
- Switch off the charging motor (if fitted), and discharge the
spring energy storage mechanism 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 bea-
ring 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 storage mechanism.
- Perform comprehensive mechanical and electrical functio-
nal 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 ade-quately qualified
personnel.