frankfurt (germany), 6-9 june 2011 hans-erik olovsson – sweden – session 1 network components...

Frankfurt (Germany), 6-9 June 2011

Hans-Erik Olovsson – Sweden – Session 1 Network Components – Paper 0453

Innovative Compact 145/12 kV IndoorAir Insulated Substations (AIS)


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


Requirements on S/S from “neighbors”


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


Functional requirements invisible S/S


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


Substation Building


#4 Disconnecting CB (DCB) in H-type configuration Transfer function, #2 145 kV cables Supply function, #2 145/12 kV transformers


Single line diagram


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


Evolution of switchgear apparatuses


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


Disconnecting CB advantages


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


Disconnecting CB principle


Prepared for “live” disconnecting of half substation Maintenance in sequence of half of the substation Other half keep 10 kV energised


DCB maintenance


Double busbar with traditional CBs Sectionalized single busbar with DCBs Unavailability due to maintenance and faults compared


Availability comparison


Maintenance according to manufacturers recommendation Fault frequency according to international statistic Considerable reduction of unavailability by using DCBs


Availability result


Better public acceptance thanks to nicer aesthetics Easier to obtain necessary permits Highest third party safety More reliable supply by having equipment indoors


Conclusions, Indoor Substations


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


Conclusions, DCB



Thank youfor 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

frankfurt (germany), 6-9 june 2011 hans-erik olovsson – sweden – session 1 network components...

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