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Gas-insulated switchgear (GIS) ELK-3, 420 kV EconiQ™ busducts

Integration of eco-efficient design into reliable and well-proven GIS technology

ELK-3, 420 kV with EconiQ busducts showcase Hitachi ABB Power Grids’ commitment to reducing the volume of sulfur hexafluoride (SF6) in transmission GIS voltage ratings. This product introduces an important step towards complete 420 kV eco-efficient switchgear by substituting the insulation gas in the product’s busducts with SF6 -free gas mixture. This step removes the SF6 in approximately 50 percent of the GIS modules.

ELK-3, 420 kV with EconiQ busducts is the ideal solution for a reliable eco-efficient energy supply up to a rated voltage of 420 kV. Based on a few building blocks with standardized dimensions, a small footprint and easy operation, the product allows multiple layouts and incremental substitution of the insulation gas with an eco-efficient solution.

The EconiQ busducts of ELK-3, 420 kV, are operating with an insulation gas mixture of Fluoronitriles (C4-FN), Carbon dioxide (CO2) and Oxygen (O2). This mixture essentially eliminates the CO2 equivalent emissions of the insulation medium compared to SF6 gas.

EconiQ is Hitachi ABB Power Grids’ eco-efficient portfolio for sustainability where products, services and solutions are proven to deliver exceptional environmental performance.



  • Power transmission
  • Integration of renewable power generation units to the grid
  • Industry applications


Why Hitachi ABB Power Grids?

  • Minimal product size allows to fit in existing layouts
  • Complete single-phase encapsulation
  • Earthquake resistant up to ground acceleration of 1g
  • Low life cycle and maintenance costs deal solutions for hydropower plants, offshore wind farms, and container solutions in combination with complete bays
  • Based on the well-proven ELK-3 family and five decades of experience in the GIS technology


Benefits of the eco-efficient technology

  • Highly reliable switchgear technology with eco-efficient insulation gas in the busducts
  • Future proof to environmental regulations
  • No risk of accidental leakage of SF6
  • Transparent environmental performance, thanks to the detailed product life cycle assessment


Brief performance data

GIS ELK-3, 420 kV EconiQ busducts  
Rated voltage [kV] 420
Rated short-duration power-frequency withstand voltage [kV] 650
Rated lightning impulse withstand voltage [kV] 1425
Rated frequency [Hz] 50 / 60
Rated normal current [A] 5000
Rated withstand current [kA] 63
Rated duration of short-circuit [s] 3
Rated peak current [kA] 171
Installation indoor / outdoor

Downloads for ELK-3, 420 kV EconiQ busducts

ELK-3, 420 kV, EconiQ busducts

2-pages, product flyer

Ingénieur de centrale électrique
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