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EconiQ gas-insulated switchgear (GIS) ELK-04, 145 kV

Eco-efficient modular GIS solution for reliable energy supply

EconiQ ELK-04, 145 kV is the most robust SF6-free gas-insulated switchgear (GIS). It combines a low carbon footprint, superior reliability and low lifecycle costs in a flexible product layout.

It is sustainable and eco-efficient product proven to significantly reduce the CO2 equivalent (CO2 eq) emissions during the complete lifecycle of the product, compared to the SF6 solution.

Based on the well-known modular design of ELK-04 with the largest installed base of any sub-transmission GIS worldwide. It offers easy operation at high-performance ratings and broad flexibility for optimizing substation layouts.

EconiQ ELK-04, 145 kV is using a 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
  • Offshore and onshore wind power connections

Why Hitachi Energy?

  • Most reliable eco-efficient GIS solution on the market
  • Exceptional engineering design
  • Using a well-proven gas circuit breaker technology
  • Softer switching characteristic of gas circuit breakers with low stress to neighbouring quipment
  • Based on the ELK-04 product family with the largest installed base of any sub-transmission GIS
  • Earthquake resistant up to ground acceleration of 1g

Benefits of the eco-efficient technology

  • Future proof to environmental regulations
  • No risk of accidental leakage of SF6
  • Transparent environmental performance, thanks to the detailed product life cycle assessment
EconiQ™ GIS ELK-04, 145 kV

Brief performance data

EconiQ GIS ELK-04, 145 kV  
Rated voltage [kV] 145
Rated short-duration power-frequency withstand voltage [kV] 275
Rated short-duration power-frequency withstand voltage across [kV] 315
Rated lightning impulse withstand voltage [kV] 650
Rated lightning impulse withstand voltage across isolating distance [kV] 750
Rated normal current [A] 3150
Rated short-time withstand current [kA] 40
Rated duration of short-circuit [s] 3
Rated peak withstand current [kA] 108
Rated operating sequence O-CO

Downloads for EconiQ ELK-04, 145 kV

EconiQ ELK-04, 145 kV

2-pages, product flyer

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