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Gas-insulated switchgear ELK-5 up to 1200 kV

Ultra-high voltage applications

Ultra high voltage (UHV) above 800 kV is the highest voltage level in use for bulk alternating current (AC) power transmission across long distances. State Grid Corporation of China (SGCC) is operating UHV grids to connect load centers to distant power plants and to improve network stability; India and Russia are planning similar networks. Hitachi Energy was one of the pioneers to design and commission a UHV GIS, the ELK-5 at Jingmen substation for State Grid Corporation of China: first UHV transmission line in China. The design features circuit breakers with four interrupters in series, high capacity pre-insertion resistors and a very compact design. Hitachi Energy has also supplied a metal enclosed ELK-5 circuit breaker at 1200 kV rated voltage for PGCIL’s Bina UHV test substation in India.


  • Long range power transmission
  • Very large power plants

Why Hitachi Energy?

  • Comprehensive experience and excellent performance in extra high voltage and UHV GIS technology
  • Excellent design, test and service capabilities

Brief performance data

Rated voltage [kV] 1,200
Rated frequency [Hz] 50
Rated short-duration power-frequency withstand voltage (1 min) [kV] 1,100
Rated lightning impulse withstand voltage (1.2/50 µs) [kV] 2,400
Rated switching impulse withstand voltage (250 / 2500 µs) [kV] 1,800
Rated normal current for feeder circuits [A] 5,000
Rated normal current for bus bar circuits [A] 8,000
Rated short-time withstand current (up to 3 s) [kA] 63
Rated peak withstand current [kA] 171
Ambient temperature range [°C] -30 … +40
Installation outdoor

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