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9. Maintenance
W ARNING
For ENA version: do not access the area behind or
alongside the sw itchgear when it is energised or
being energised.
9.1 General
Maintenance serves to preserve trouble -free operation
and achieve the longest possible working life of the
switchgear. It comprises the following clos ely related
activities:
Inspection: Determination of the actual condition
Servicing:
Measures
condition
Repair: Measures to restore the specified condition
Note: W hen 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 qualified competent
personnel familiar with the characteristics of the
individual switchgear, in accordance with all relevant
IEC saf ety regulations and those of other technical
authorities, and with other overriding instructions. It is
Ac ti vi t y p erfo rmed
Ac co rd i n g to secti o n
Insp ect io n
Serv icing
Repa ir
( 1 ) I n m o r e d e m a nd i n g s e r v i c e c o n d i t i o ns , w e r e c o m m e nd r e d uc i n g t h i s i nt e r v a l s u i t a b l y
( 2 ) A c c o r d i n g t o t he r e s ul t s o f t he i ns pe c t i o n .
( 3 ) S e e t he i ns t r uc t i o n m a n ua l s o f t he s w i t c h i n g d e v i c e .
9.2 Inspection
W here
necessary,
isolated
and
secured
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
should be carried out once every four years by
qualified competent electricians.
Under abnormal operating conditions (including
adverse
climatic
environmental
stresses
aggressive atmosphere, among others), inspection
may be necessary at shorter intervals.
Inspection is primarily to carry out a visual check
for grime, corrosion and moisture:
-Effects of high temperature on main circuits.
-Traces of partial discharge on the insulating
material parts.
-Traces
of
leakage
material parts.
-Surfaces of the contact systems.
64
to
preserve
the
specified
T i me i n terval i n year s
9. 2
9. 3
9. 4
the
working
area
must
against
reconnection
conditions,
inspection
conditions)
and/or
(heavy
pollution
current
on
the
insulating
recommended that ABB service personnel be called in
to perform the servicing and repair work detailed
below. The inspection and servicing intervals for some
of the equipment/components (e.g. parts subjects to
wear)
are
determined
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
aggressive air). The operating instructions of Vmax
circuit-breaker must also be followed.
If necessary, further details can be taken from the
technical documentation for the switchgear installation
(including,
conditions agreed on).
9.1.1 Intervals for inspection, servicing and repairs
Time intervals for mai ntenance work to be carried out
always depend on the operating conditions of the
switchgear, and mainly on the mode of operation, the
number of rated and short -circuit current switching
operations, ambient temperature, pollution etc. W e
recommend carrying out the maintenance work at the
following intervals:
Ac co rd i n g to n u mb er o f sw itch i n g o p erati o n s
( 1 )
4
( 2 )
4
As require d
However, inspection must also include correct
mechanical/ electrical operation of the following
be
parts: switching devices, actuating, interlocking,
in
protection and signalling devices.
W ith
regard
separate Instruction manual should be followed
Check all switchgear accessories and auxiliary
devices (e.g. storage batteries).
No partial discharge must occur on the surfaces of
equipment at operating voltage. This can, for
example, be detected by characteristic noises, a
clearly
perceptible
glowing in the dark.
special
Visually
and
recommend turning the contact system alternately
in order to clean the inner contact points of the
contact system. The contact points should be
cleaned
surface) are visible .
If any irregular conditions are detected, then
relative repair measures must be taken.
by fixed
influences
(including
for
example,
any
As require d
As require d
As require d
to
the
switching
smell
of
checking
the
contact
if
signs
of
overheating
criteria,
such
as
pollution
and
special
operating
( 3 )
( 3 )
devices,
their
ozone,
or visible
system.
W e
(discoloured
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