Condition Criticality Risk Rating and Condition Monitoring in a Distribution Network

1. Paul Dyer Condition Criticality Risk Rating and Condition Monitoring in a Distribution Network PAUL DYER DAVE OPENSHAW London Electricity Group Thank you for the introductionThank you for the introduction

2. Paul Dyer What am I going to talk about ? Risk Management Maintenance strategies Plant specific diagnostics What are the benefits Summary London Electricity Then a brief summary of the electrical network London Electricity Then a brief summary of the electrical network

3. Paul Dyer Ensure safety of staff and members of the public Prevent interruption to supply Extend the useful life of the asset Ensure that the most cost effective solutions in place Enable informed asset replacement policy London Electricity Then a brief summary of the electrical network London Electricity Then a brief summary of the electrical network

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6. Paul Dyer London Electricity Then a brief summary of the electrical network London Electricity Then a brief summary of the electrical network

7. Paul Dyer Reactive FOR Considered to be cheap No policy to develop No routine maintenance to budget for AGAINST Safety risk Unscheduled down time Damage to plant Teams always to be ready Loss of confidence

8. Paul Dyer FOR Easy to predict labour and plan Can ensure maintained before failure AGAINST Not easy to predict failure Easy to over or under maintain Time based

9. Paul Dyer Duty based FOR Tailored to actual usage Minimises work AGAINST Needs development work to set duty levels Requires hours run or other duty counters

10. Paul Dyer Condition based FOR Tailored to plant condition Minimises work and knowledge of plant condition AGAINST Needs development work to set condition levels Requires diagnostic equipment Requires some skill to assess condition

11. Paul Dyer Transformer diagnostics Moisture and dielectric tests Dissolved gas in oil analysis Furfuraldehyde analysis Hydran on/off line Metal in oil Particle analysis London Electricity Then a brief summary of the electrical network London Electricity Then a brief summary of the electrical network

12. Paul Dyer Maintenance strategies Switchgear So what diagnostics do we have available? 1. Discharge Transient Earth Voltage monitoring Ultrasonic detection Radio frequency detection Discharge sensitive gel London Electricity Then a brief summary of the electrical network London Electricity Then a brief summary of the electrical network

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14. Paul Dyer Maintenance strategies Cable diagnostics Why are we interested in cables? Main cause of loss of supply Failure is common Adversely affects KPIs Main nuisance to customers London Electricity Then a brief summary of the electrical network London Electricity Then a brief summary of the electrical network

15. Paul Dyer Maintenance strategies Cable diagnostics So what can we do? Monitor failures Off line partial discharge tests On line partial discharge monitoring London Electricity Then a brief summary of the electrical network London Electricity Then a brief summary of the electrical network

16. Paul Dyer SUMMARY What measurements are important? Evaluate the risk to the system What data tells me most about equipment operating condition? Do I need to take measurements from each item How much will it cost ? How much time interpreting the results? Will the measurements be acted upon? London Electricity Then a brief summary of the electrical network London Electricity Then a brief summary of the electrical network

17. Paul Dyer Maintenance strategies THE END Any questions? London Electricity Then a brief summary of the electrical network London Electricity Then a brief summary of the electrical network