Stored-Energy Spring Mechanism; Breaker Pole; Repair - ABB VD4 Instruction Manual

trichlorethane, trichlorethylene or carbon tetrachloride!

7.3.2 Stored-energy spring mechanism

Servicing for 10 years or the spring mechanism is to be
performed after 10,000 operating cycles.
Prior to servicing, switch the breaker off, and isolate the outgoing
feeder.
Observe the safety regulations!
Details of the servicing:
Swich 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 after 10,000 operating cycles as a precaution
(for details see ABB Xiamen Switchgear Limited Co.
after-sales service).
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. Lubricant: Isoflex Topas
NB 52.(Code GCE 0007249P0100)
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.
Perform comprehensive mechanical and electrical
■
functional tests.
Note: This work may only be performed by the after-sales
service personnel of ABB Xiamen Switchgear Limited
Co. 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 2.4:
When the sum current limit is reached, the complete
■
breaker poles are to be replaced.
When the permissible number of mechanical operating
■
cycles (i.e. the number corresponding to I
characteristic curve) of the vacuum interrupters has been
reached, the breaker poles must be replaced.
However, it should be investigated before hand as to whether
the installation of a new breaker would be more advantageous.
Note: Dismantling and Replacement of the complete breaker
poles should only be carried out by ABB Xiame
Switchgear Limited Co. after-sales service personnel
or by specially trained personnel, particularly as proper
adjustment is necessary.

7.4 Repair

Replacement of circuit-breaker parts and accessories
Only remove and reassemble circuit-breaker parts and
accessories when the breaker has been switched off and the
working area is to be isolated and secured against reclosing.
The spring energy storage mechanism must be discharged.
All auxiliary voltage sources must be disconnected and
secured against reclosing during the removal and installation
work.
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VD4 Vacuum Circuit-breaker | Maintenance 27