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John MILLAR – Finland – RT.1a/5a

Distribution Network Planning and Underground Cables Keeping overview while attending to detail. John MILLAR – Finland – RT.1a/5a. …with much appreciated help from, among others: Prof. Matti Lehtonen and Eero Saarijärvi. My research fields. Ampacity of underground cables

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John MILLAR – Finland – RT.1a/5a

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  1. Distribution Network Planning and Underground Cables Keeping overview while attending to detail John MILLAR – Finland – RT.1a/5a …with much appreciated help from, among others: Prof. Matti Lehtonen and Eero Saarijärvi

  2. My research fields • Ampacity of underground cables • Practical investigations of their thermal environment • Development of real-time algorithms • Network planning algorithm • MV, LV and MV-LV…

  3. Underground cable rating • Suggeststeady-state for planning • The future is hard to predict… • Cyclic rating for existing, but note: • Needsthoroughknowledge of installed conditions • Must consider: • Moisture migration • Externalheat sources • Condition of existingcables

  4. Cyclic vs. Steady-state rating forexisting MV cables • 90 °C: • steady-state rating: 382 A • cyclic rating: 462 A • 65 °C: • steady-state rating: 340A • cyclic rating: 385 A

  5. Cables: Installation challenges • Crowding of underground services • Duct bank and tube installation ratings more challenging • Charging current >> load currents for long rural cable connections

  6. Distribution network planning • Automating the laborious task of trial and error planning • An algorithm that deals with real networks and realistic planning issues in reasonable computation times • Trying to keep up with contemporary developments...

  7. VOH_MV • ‘Optimally’ routes lines between fixed primary and secondary substations, i.e. plans the MV network. • Optimal or full switching – 3 levels • Optimal or full backup connections between main feeders • Existing network consideration and upgrade times • User-preferred network

  8. VOH_MV, e.g.:

  9. VOH_MV_LV • Starts with LV customers and primary substation positions • ‘Optimises’, according to various planning philosophies: • secondary substations (no. and positions) • connection (cable) boxes (no. and positions) • And, of course the MV and LV network • routing – switches – backup

  10. VOH_MV_LVOne approach Primary Substations LV customers

  11. VOH_MV_LVAnother approach

  12. VOH_MV_LVand another approach

  13. VOH_MV_LVand finally...

  14. Contemporary developments • mmm... We know that this algorithm should be able to handle • distributed generation – coming ‘soon’! • What else? Many thanks!

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