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

Combining low carbon footprint and well-proven GIS technology for highest reliability

EconiQ GIS ELK-3, 420 kV is a landmark achievement that entirely substitutes sulfur hexafluoride (SF6) in 420 kV switchgear with an eco-efficient gas mixture. It showcases Hitachi Energy’s commitment to eliminate SF6 in transmission GIS voltage ratings.

EconiQ GIS ELK-3, 420 kV is the ideal solution for reliable eco-efficient energy supply up to a rated voltage of 420 kV. Based on a few building blocks with standardized dimensions, it supports all typical substation layouts,while offering the same footprint as traditional SF6 GIS. Thanks to its easy operation, it allows for maximum reliability.

The EconiQ GIS ELK-3, 420 kV operates 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.

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 enabling an easy fit into existing layouts
  • Complete single-phase encapsulation
  • Robust design proven by electrical endurance class E2
  • Earthquake resistant up to ground acceleration of 1g
  • Ideal solutions for hydropower plants, offshore wind farms, and container solutions
  • Based on the well-proven ELK-3 family and five decades of experience in the GIS technology

Benefits of the eco-efficient technology

  • Best in class life-cycle assessment result
  • Highly reliable switchgear technology with eco-efficient insulation gas
  • No risk of accidental leakage of SF6
EconiQ™ gas-insulated line (GIL) ELK-3, 420 kV

Brief performance data

EconiQ GIS 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 GIS ELK-3, 420 kV

EconiQ GIS ELK-3, 420 kV

2-pages, product flyer

power plant engineer for substation

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