What are the cost effective, technically feasible, energy efficient and reliable alternatives?
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1) The document discusses alternatives to SF6 gas for use in gas insulated switchgear (GIS), focusing on cost-effective, efficient, and reliable options both today and in the future. 2) Currently, some suppliers are using SF6-free designs for busbars and GIS bays that can avoid 1,000-7,000kg of SF6, equal to reducing CO2 emissions by 165,000 tons. 3) Hitachi Energy has a pilot project replacing SF6 in a 420kV GIS with C4-FN gas mixture, removing 755kg of SF6 (17,700 tons of CO2 avoided), and plans to launch the first commercial SF6-free
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What are the cost effective, technically feasible, energy efficient and reliable alternatives?
- 1. SPREKER: Lukas van der Zijden and Tim Vollrath What are the cost-effective, technically feasible, energy efficient and reliable alternatives?
- 2. How suppliers can support, today & tomorrow Why? What about today? What about tomorrow?
- 3. Why? – Life Cycle Assessment of 420 kV Gas Insulated Switchgear GIS Assumptions: 40 years lifetime, 0.5%/year leakage rate, 20% further losses, one GIS bay with 70 m GIL exit 30 % average current, EU-28 power mix SF6 representative for the historic installed base: 12 300 t CO2 eq. SF6 Emissions 12’000 t CO2 eq. Vacuum breakers and technical air (hypothetical) 660 t CO2 eq. More material consumption due to 550 kV/800 kV size SF6, improved Sealings and service concept 2 100 t CO2 eq. 0.1%/year leakage rate, 2% further losses EconiQ 440 t CO2 eq. C4-FN Emissions < 80 t CO2 eq. Gas leakage as in historic installed base (0.5%/year) C4FN CO2 O2
- 4. TODAY – 420kV Applications Busbars + GIBs are in SF6-free design Typical saving 40-60% SF6 avoided ~1’000 to 7’000 kgSF6 (7’000kgSF6 = 165’000tonCO2) Public information WindyHill SPEN
- 5. TODAY – (Hitachi Energy) Pilot project: Richborough, National Grid UK • Retrofill for ELK-3, 420 GIL • 755kg of SF6 removed = 17’700 tons of CO2 • Replaced with C4-FN – mixture • <10% increase in pressure • Fully type tested for 420 kV rating • Successful HV Test on first trial • Energization: 2nd December 2021
- 6. Expected release at the end of 2022 World’s first commercial GIS alternative to SF6 Reduce CO2 equivalent emissions related to the insulation gas Enable customers and the industry to reduce carbon footprint and rapidly transition to eco-efficient solutions Scalable and robust technology Breakthrough in the industry for SF6-free solutions for higher voltage levels EconiQ Gas-insulated switchgear (GIS) 420 kV The first commercial GIS alternative to SF6 TOMORROW – First commercial alternative to SF6, fully SF6 free
- 7. TODAY & TOMORROW: more than GIS
- 9. Why? – Life Cycle Assessment of 145 kV Gas Insulated Switchgear GIS Assumptions: 40 years of lifetime, 0.5% per year leakage rate, 20% other gas losses (manufacturing, handling mistakes) SF6 Product 838 tons CO2 eq. ‒ Compact size, best reliability, scalability to all high voltage levels ‒ Essentially eliminates the carbon footprint of the insulation gas ‒ Customer value from convergence to a common gas The best choice for our customers and the society C4FN CO2 O2 Eco gas mixture Life cycle assessment (LCA) Example: Carbon footprint of GIS ELK-04, 145 kV C4FN Product EconiQ 59 tons CO2 eq. Vacuum/Air Technology 63 tons CO2 eq. SF6 Emissions over life cycle 784 tons CO2 eq. C4FN mixture emissions < 5 tons CO2 eq. Power losses over lifetime Carbon footprint of material (larger size) Insulation gas losses Materials Power losses Legend Why are we using it?