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Most of the power system equipment requires regular and
effective maintenance to operate correctly and meet their
design specifications. The consequences of ineffective
equipment maintenance can be huge in terms of system
reliability indices, revenue loss and organizational image.
The traditional time-based maintenance is expensive and
not efficient, compared to the conditioned-based
maintenance Therefore, the importance of effective
maintenance through condition monitoring of electrical
equipment in the system is gaining importance to reduce
the occurrence of such incidents. Assessing the condition
and thereby reducing failures of equipment is a key to
improving reliability and also effectively extending the life
of equipment. Hence, utilities are continuously in search
of best maintenance practices other than traditional
methods/techniques to assess the condition of equipment
in service so that remedial measures can be taken in
advance to avoid disastrous consequences thereby saving
lot of valuable resources.
Medium Voltage (MV) underground system represents a
large asset base of TNB Distribution and contributed
significantly to overall system performance. Causes of
failures are predominantly due to issues related to “old
cable joint technologies” used since early 80’s until early
2000. TNB Distribution introduced new cable joint
technologies but large population of joints of older
technologies still represents substantial reliability risk to
system performance.