28 36KV I
S
LIMITER PANEL INSTALLATION, OPERATION AND MAINTENANCE MANUAL
7.1 General
Maintenance serves to preserve trouble-free operation and
achieve the longest possible working life of the switchgear.
It comprises the following closely related activities:
Inspection: Determination of the actual condition
Servicing: Measures to preserve the specified condition
Repair: Measures to restore the specified condition
Note!
When carrying out all maintenance work, the regulations in
the country of installation must be strictly complied with.
Maintenance work may only be performed in a careful
manner by trained personnel familiar with the
characteristics of the individual switchgear, in accordance
with all relevant safety regulations to IEC and of other
technical authorities, and with other overriding instructions.
It is recommended that ABB service personnel be called in to
perform servicing and repair work, and this is necessary for
some of the work detailed below.
The inspection and servicing intervals for some of the
equipment/components (e.g. parts subjects to wear) are
determined by fixed criteria such as switching frequency,
length of service and number of short- circuit breaking
operations. On the other hand, for other parts, the length of
the intervals may depend, for example, on the different
modes of operation in individual cases, the degree of
loading, and also environmental influences (including
pollution and aggressive air).
The following operating instructions must also be observed
together with this instruction manual in the individual cases
concerned:
I
s
-limiter
TM
Insert: Instruction manual BA 323/04 E
(GCEA 67 0323 P0102)
Customer specific test procedures must also be referred
where ever applicable.
If necessary, further details can be taken from the technical
documentation for the switchgear (including, for example,
any agreed special operating conditions).
7.2 Inspection
Before inspection, where required, the working area must be
isolated and secured against reconnection in accordance
with the 'Safety Regulations' specified by IEC and
appropriate national standards before inspection
• Correct condition of the switchgear should be monitored
by regular inspections
• Under normal operating conditions, inspection should
be conducted once every two year by specially trained
professional electricians / engineers
• Under unusual operating conditions (including adverse
climatic conditions) and/or peculiar environmental
stresses (among other strong pollution and aggressive
atmosphere), inspection may be necessary at shorter
intervals
• Inspection is primarily to constitute a visual check for
grime, corrosion and moisture:
- Effects of high temperature on the main circuits,
- Traces of partial discharge on the insulating material
parts
- Traces of leakage current on the insulating material
parts
- Surfaces of the contacts
• However, inspection is also to include the proper
mechanical/electrical function of the following facilities:
switching devices, actuating, inter- locking, protection
and signaling facilities
• On panels with additional ventilation devices due to
increased ambient temperature
1. Check flap for air inlet for correct function.
2. The centrifugal fan doesn’t require any special
maintenance. Its working life, depending on the
service conditions - one significant parameter being
the room temperature - is approx. 20,000 to 30,000
operating hours.
The voltage is supplied from an external voltage source and
is activated by a current-dependent relay at 70% of the
instrument transformer's rated current.
—
7. Maintenance
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