Apr 2013
Electricity Transmission
Grading Capacitor Condition Evaluation
Live
Apr 2013
Unknown
National Grid Electricity System Operator
National Grid TO Innovation Team
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Innovation Funding Incentive
None
Asset Management
£279,000.00
Internal examination of circuit-breaker voltage grading capacitors removed from service has revealed incipient faults that would certainly have lead to failure but which were not revealed by existing diagnostic checks. The present work is concerned with applying a range of diagnostic techniques to capacitors that have been in service and correlating the indications obtained with the results of internal inspections to identify the techniques most effective in detecting incipient fault conditions. The knowledge obtained will be used to decide whether the capacitors of circuit-breakers undergoing refurbishment are fit for a further 20 years service without risk of disruptive failure or whether they require replacing.
The key objective of the project is to establish the correlation between diagnostic measurements on circuit breaker voltage grading capacitors that have been in service and the actual condition of the capacitor. The knowledge obtained will be used to decide whether the capacitors of circuit breakers undergoing refurbishment are fit for a further 20 years service without risk of disruptive failure or whether they require replacing.