1. Frankfurt (Germany), 6-9 June 2011 Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 Innovative Compact 145/12 kV Indoor Air Insulated Substations (AIS)

2. Frankfurt (Germany), 6-9 June 2011  AIS not so nice aesthetic  Want power without seeing it  Originally location outskirt of city  Now surrounded by residential etc.  Third party safety, e.g. children playing Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 Requirements on S/S from “neighbors”

3. Frankfurt (Germany), 6-9 June 2011  Permit and siting, long lead time item  External view very important  No fence, building itself shell protection  Underground cable connections  Minimized site work and thus disturbance to neighbors Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 Functional requirements invisible S/S

4. Frankfurt (Germany), 6-9 June 2011  Pre-fabricated wall elements of concrete  Bricks on facade to blend into surrounding  No open air contacts in 145 kV switchgear, hatches open in case of arc  Separate rooms for transformers, MV-switchgear, relay & control Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 Substation Building

5. Frankfurt (Germany), 6-9 June 2011  #4 Disconnecting CB (DCB) in H-type configuration  Transfer function, #2 145 kV cables  Supply function, #2 145/12 kV transformers Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 Single line diagram

6. Frankfurt (Germany), 6-9 June 2011  CB development -> reduced maintenance of CB  Change of substation design principle  Previous: enable CB maintenance  Today: enable maintenance of external equipment  New apparatuses with combined functions evolved Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 Evolution of switchgear apparatuses

7. Frankfurt (Germany), 6-9 June 2011  Combines breaking and disconnecting function  All contacts enclosed, no open arcs when switching  Reduced footprint appr. 50%  Reduced maintenance, 15 years interval  Less faults and maintenance -> Increased availability Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 Disconnecting CB advantages

8. Frankfurt (Germany), 6-9 June 2011  Contact system similar to traditional CB  ”Normal” op. device for close-open  Separate op. device for blocking of CB pole when used as disconnector  Visible earthing -> personnel safety Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 Disconnecting CB principle

9. Frankfurt (Germany), 6-9 June 2011  Prepared for “live” disconnecting of half substation  Maintenance in sequence of half of the substation  Other half keep 10 kV energised Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 DCB maintenance

10. Frankfurt (Germany), 6-9 June 2011  Double busbar with traditional CBs  Sectionalized single busbar with DCBs  Unavailability due to maintenance and faults compared Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 Availability comparison

11. Frankfurt (Germany), 6-9 June 2011  Maintenance according to manufacturers recommendation  Fault frequency according to international statistic  Considerable reduction of unavailability by using DCBs Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 Availability result

12. Frankfurt (Germany), 6-9 June 2011  Better public acceptance thanks to nicer aesthetics  Easier to obtain necessary permits  Highest third party safety  More reliable supply by having equipment indoors Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 Conclusions, Indoor Substations

13. Frankfurt (Germany), 6-9 June 2011  Minimum footprint and thus environmental impact  All primary contacts encapsulated Minimum risk of primary faults Maintenance reduced to a minimum  No open contacts for switching -> Highest personnel safety Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 Conclusions, DCB

14. Frankfurt (Germany), 6-9 June 2011 Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453 Thank you for your attention! http://www.youtube.com/watch?v=7qmXgBNL6ro http://www.youtube.com/watch?v=RlEDDlSvXLA&feature=related http://www.youtube.com/watch?v=VfwpF68Di8k