As part of a private finance initiative, EDF Energy Powerlink owns and operates the power distribution network of interconnected substations that deliver power to London Underground stations and depots.
As part of the PFI contract, EDF are required to determine the reliability of each delivery point by means of a theoretical relaibility analysis using specified data and methods of analysis agreed with London Underground.
To provide theoretical reliability analysis of each delivery point in the network: approximately four types of delivery point at each of the 200 substations in the network.
McLellan was engaged by EDF to set up and carry out the analyses for all sites.
Each delivery point required calculation of failure rate, mean time between failures (MTBF), outage time and mean time to repair (MTTR), using the 'cut set' method of IEEE Std 493.
The work included:
There were several repeat orders for McLellan:
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