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Gas-insulated switchgear ELK-3 up to 550 kV

High performance ratings in a compact design

The gas-insulated switchgear ELK-3 for ratings up to 550 kV, 6300 A, 80 kA is applied in all 420 kV and 550 kV grids worldwide. More than 1,500 installed circuit breaker bays demonstrate proven excellent performance of our product. ELK-3 is available with several options for the highest requirements. Some of the places where the largest 550 kV GIS has been installed worldwide include Three Gorges Dam-China and Itaipu Binacional-Brazil/Paraguay hydro power plants.


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

Why Hitachi Energy?

  • High-performance ratings
  • High ratings up to 6300 A currents and 80 kA short circuit current
  • Monitoring, control, protection and communication features for smooth integration into digital substation systems using IEC 61850
550 kV GIS substation Three Gorges Project, China

Brief performance data

GIS ELK-3    
Rated voltage [kV] 420 550
Rated frequency [Hz] 50/60
Rated short-duration power-frequency withstand voltage (1 min) [kV] 650 740
Rated lightning impulse withstand voltage (1.2/50 µs) [kV] 1,425 1,675
Rated switching impulse withstand voltage (250 / 2,500 µs) [kV] 1,050 1,300
Rated normal current – busbar / feeder [A] 5,000 6,300/5,000
Rated short circuit-breaking current [kA] 63 63/80
Rated short-time withstand current (up to 3 s) [kA] 63 63/80
Rated peak withstand current [kA] 170 171/216
Bay width [mm] 2,160/2,700 3,120
Ambient temperature range [°C] -30 … +55
Installation indoor / outdoor

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