Service And Maintenance; General Warnings And Cautions; Maintenance Intervals; Inspection - ABB SafeRing Product Manual

20 SERVICE AND MAINTENANCE

20.1 GENERAL WARNINGS AND CAUTIONS

WARNING
Pay attention to the following safety warnings:
Preparing the switchgear for safe assembly
1. For each case, set safe working conditions with
the utility safety officer.
2. Make sure that national safety regulations are
followed.
3. Make sure there is no voltage in the busbars
and cable terminals and that the risk of reconnec-
tion is eliminated in all units. Any remote control
must also be prevented.
4. Make sure that auxiliary circuits are also dis-
connected from all possible power supply sources
(including instrument transformers)
TOOLS REQUIRED
− Tool list as specified under chapter 20.6
− Vacuum cleaner
− Cleaning cloths
− Mild alkaline cleaning agent
- Do not use trichloroethane, carbon carbotetrachloride or
any kind of alcohol, etc. for cleaning
− Clean water
− Silicone liquid
- In special cases, insulating surfaces can be covered with
a thin layer of silicone liquid such as DC200/100CS or
similar
− Instruction manuals
− Test equipment
MAINTENANCE INSTRUCTIONS
Maintenance serves for preserving trouble-free operation and
achieving the longest possible working life of the switchgear.
It comprises the following closely related activities:
− Inspection: Determination of the actual conditions
− Servicing: Measures to preserve the specified conditions
− Repairs: Measures to restore the specified conditions
The time intervals for maintenance work to be carried out
always depend on the operating conditions of the switchgear
and, above all on the mode of operation, the number of rated
and short-circuit current switching operations, ambient tem-
perature, pollution, etc.
The maintenance intervals and measures to be taken that are
given in table below are recommended for SafeRing/SafePlus
under normal service conditions. Three year intervals are re-
commended for all maintenance measures in more demanding
conditions (such as areas with high pollution levels).
OTHER IMPORTANT INSTRUCTION MANUALS
The operation of all protection relays should be checked in
accordance with the manufacturer's instructions.
All components in the SF
6
declared life expectancy of the product. The tank is made of
stainless steel.
tank are maintenance-free for the

20.2 MAINTENANCE INTERVALS

We recommend carrying out the maintenance work at the
following intervals:
Activity performed According to section

Inspection

19.3
Service 19.4
Repairs 19.5
Under more demanding service conditions, we recommend shortening
2)
this interval appropriately.
According to the results of the inspection.
3)
Other services may be required, as when max number of ope-
rations is reached, please contact ABB to order inspection.
NOTE
Under abnormal operating conditions (including
adverse climatic conditions) and/or particular
environmental conditions (among which, heavy
pollution and aggressive atmosphere), inspection
at shorter intervals may be necessary.
20.3 INSPECTION
GENERAL ASPECTS
Where necessary, the working area must be isolated and
secured against accidental re-connection before inspection,
in accordance with the "Safety Regulations" specified by IEC
standards and corresponding national standards. The switch-
gear condition must be monitored by regular inspections.
Under normal operating conditions, inspections should be
carried out once every fifth year by suitably trained personnel.
INSTRUCTIONS
Carry out the following inspections:
− Visually check for dirt, corrosion and moisture.
− Check for traces of discharges on insulating material parts.
− If there are test points:
− Visually check the contact points and surrounding
earthed surfaces.
− If there are signs of pollution or dust, please clean the
area.
− Check the operating pressure of the gas-insulated
switching devices where possible. Follow gas-chapter for
further instructions.
− Check condition and life time of installed accessories and
auxilliary devices; change if necessary according to com-
ponent data sheet.
− If corrosion is observed on mechanisms, motors or other
accessories please contact ABB to evaluate if anything
needs to be replaced.
− Check that there are no visible signs of, or damage from,
partial discharges.
− There should not be any visible signs of overheated
connections.
− All components should perform perfectly and any faulty
components must be replaced.
Time interval in years
5
2)
As required
3)
As required
39