Successful implemented Condition Based Maintenance for switchgear

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Successful implemented Condition Based
Maintenance for switchgear
Session No 1, Paper No 14
The Netherlands

• Presenter E.R.S. Groot

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A guided tour through the implementation
process of CBM (step by step)based on
questions and problems we dealed with
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Where did we start?? (more then 60 different
type of switchgear)

• Based on the selection criteria
• Current maintenance costs
• Current outage time for maintenance
• Risk for maintenance induced failures
• Population size
• Age and expected lifetime
• Current failure behaviour and frequency

.we started with a minimum oil breaker
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What are critical components of this switchgear ??

• We applied an FMECA approach and weighted each
  component

• Failure frequency (score 0,1,2)
• Impact of failure on energy supply (score 1,2,3)
• Corrective costs (score 1,2,3)
• Environmental impact (score 1,2)

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FMECA register (screen dump)
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The outcome of the FMECA exercise resulted in a
new optimised maintenance program ..

• A mixture of maintenance, inspections and
  measurement activities were focused on critical
  components only

This optimised maintenance program resulted in
the first cost reduction of 29
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How do we- control and update the new
maintenance program in the field- support the
electrician with actual normsand instructions-
guaranty the continuation of feed back of field
experience
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Therefore we developed the Inspector software
tool
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Field support with actual norms and instructions
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How do we handle the increased amount of data
like

• Measurement results
• Inspection results
• Maintenance information
• Failure information

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We developed the I-Core database
type time
analysis
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The I-Core database for

• storage of data (measurement and inspection
  results, failure information etc)
• optimising norms and criteria
• research of aging mechanisms
• improvement and optimisation of the condition
  based maintenance program

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Example correlation between moisture level in
oil and aging of coqolite
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Example norm and criteria optimisation
Norm definition for velocity based on large
population measured data
Probability density curve of switching velocity
Define a maximum norm for contactpressure based
on influence on velocity
Correlation between contact pressure and
velocity
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The outcome of the data analyses resulted in a
furtheroptimised maintenance program ..
The optimisation of both the mixture of
maintenance and measurement activities and
frequency resulted in a total cost reduction of
35
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Conclusion

• Good experiences with CBM
• Still implemented it succesfully for other type
  of switchgear
• Growing importance for condition data (not
  only as a foundation for CBM)