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Gas-insulated switchgear ELK-4 up to 800 kV

Extra high-voltage GIS

The gas-insulated switchgear ELK-4 is used for long range power transmission at extra high voltages (EHV) of up to 800 kV. ELK-4 offers optimized, compact and easily accessible layouts for the common one-and-a-half-breaker and two-breaker circuit schemes. High performance circuit breakers with pre-insertion resistors provide reliable switching and protection. Hitachi ABB Power Grids delivered the first generation ELK-4 GIS to South Africa for ESKOM’s 765 kV grid in 1987. The substation was one of the first ever commissioned 800 kV GIS worldwide and continues to provide excellent service.
 

Applications

  • Long range power transmission
  • Very large power plants

Why Hitachi ABB Power Grids?

  • Proven GIS technology over five decades
  • Worldwide footprint and experience
  • Comprehensive experience and excellent performance in EHV and ultra high voltage GIS technology
  • Excellent design, test and service capabilities

Brief performance data

GIS ELK-4  
Rated voltage [kV] 800
Rated frequency [Hz] 50
Rated short-duration power-frequency withstand voltage (1 min) [kV] 960
Rated lightning impulse withstand voltage (1.2/50 µs) [kV] 2,100
Rated switching impulse withstand voltage (250 / 2500 µs) [kV] 1,550
Rated normal current – busbar / feeder [A] 6,300/5,000
Rated short circuit-breaking current [kA] 63
Rated short-time withstand current (up to 3 s) [kA] 63
Rated peak withstand current [kA] 171
Bay width [mm] 9,420
Ambient temperature range [°C] -30 … +40
Installation indoor / outdoor
Gas-insulated switchgear ELK-4 up to 800 kV
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