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EconiQ™ gas-insulated line (GIL) ELK-3, 420 kV

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

EconiQ GIL ELK-3, 420 kV showcase Hitachi Energy’s 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.

EconiQ GIL ELK-3, 420 kV 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, same footprint as SF6 and easy operation, the product allows multiple layouts and incremental substitution of the insulation gas with an eco-efficient solution.

The EconiQ GIL 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 Energy’s 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 Energy?

  • Minimal product size allows to fit in existing layouts
  • Complete single-phase encapsulation
  • Earthquake resistant up to ground acceleration of 1g
  • Ideal 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
  • No risk of accidental leakage of SF6
EconiQ™ gas-insulated line (GIL) ELK-3, 420 kV

Brief performance data

EconiQ GIL ELK-3, 420 kV  
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 peak current [kA] 171
Installation indoor / outdoor

Downloads for EconiQ GIL ELK-3, 420 kV

EconiQ GIL ELK-3, 420 kV

2-pages, product flyer

power plant engineer for substation

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