Extra high-voltage GIS
Gas-insulated switchgear ELK-4 up to 800 kV
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 Energy 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 Energy?
- 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 |
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