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ELK Hybrid Switchgear 550 kV

Space and cost optimization with proven technology

The simplified GIS, ELK for hybrid applications on 550 kV combines the advantages of encapsulated technology with the simplicity of air-insulated switchgear (AIS). Our hybrid technology delivers the essential switching and measuring components utilizing the well-proven ELK technology of Hitachi Energy that has been in service for close to five decades. It is the most reliable and economical solution for new installations or extensions, and retrofit of existing substations.


  • Optimal for new substation installations with constrained space requirements
  • Substation extensions
  • Replacement of aged conventional equipment to extend lifetime of substation
  • Areas of high seismic activity benefit from low gravity point of equipment

Why Hitachi Energy?

  • Proven GIS technology for close to five decades
  • Worldwide footprint and experience
  • Up to 70 percent space reduction compared to conventional AIS
  • Reduced investment costs including transportation and civil works
  • Delivery and installation time of 5-6 months
  • Full substation design flexibility
  • High level of safety due to earthed GIS enclosures and access from ground level to the drives and viewports

Brief performance data

Hybrid Switchgear ELK  
Rated voltage [kV] 550
Rated frequency [Hz] 50/60
Rated short-duration power-freq. withstand voltage (1 min) [kV] 740
Rated lightning impulse withstand voltage (1.2/50 µs) [kV] 1675
Rated switching impulse withstand voltage (250 / 2,500 µs) [kV] 1300
Rated normal current – busbar / feeder [A] 5,000/6300
Rated short circuit-breaking current [kA] 63/80
Rated short-time withstand current (up to 3 s) [kA] 63/80
Rated peak withstand current [kA] 172/216
Ambient temperature range [°C] -30 … +40
Installation outdoor

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