EconiQ® retrofill for gas-insulated lines ELK-3, 420 kV and 550 kV
Replacing SF₆ in installed high-voltage gas-insulated lines (GIL) with an eco-efficient gas mixture to improve the environmental and lifecycle performance of the equipment
The innovative EconiQ retrofill solution uses eco-efficient fluoronitrile based gas mixture to replace SF6 in installed gas-insulated lines. This can be done with minimum changes to existing equipment while ensuring performance of the equipment and significantly lowering environmental impact.
In this process, SF6 from the installed gas-insulated lines is evacuated and filled into gas bottles for recycling or disposal and the GIL is then flushed to remove any humidity. The new eco-efficient gas mixture is then filled into the GIL and the switchgear is re-energized to connect back to the grid. The process is relatively quick and enables the reuse of passive gas components designed for SF6 to be converted into non-SF6 equipment, thereby improving their environmental and lifecycle performance.
EconiQ is Hitachi Energy's eco-efficient portfolio for sustainability where products, services and solutions are proven to deliver exceptional environmental performance.
Applications
- Installed ELK-3, 420 kV and 550 kV gas-insulated lines
Why Hitachi Energy?
- Our solution is developed specifically to reduce the quantity of SF6 in installed high-voltage equipment without doing any major changes or upgrades on the existing equipment. All work can be performed without opening and dismantling the installed GIL. There is no need to change installed sealings, only gas is replaced.
- Our eco-efficient gas mixture significantly reduces the CO2 equivalent emissions as compared to SF6 while providing the identical ratings, same reliability and life cycle performance.
- Extensive GIS know-how and service support for smooth process in planning and execution at site.
Key product benefits
- A smooth process of replacing SF6 with an eco-efficient gas mixture
- Retrofill can be completed without dismantling the installed GIS or GIL
- No major maintenance or repair work needed
- Gas replacement does not require changing the installed sealings
- Maintains regular outage times
- Converts SF6-based equipment to operate on an eco-efficient gas mixture for GIS or GIL
- EconiQ retrofill in passive components eliminates approximately 50% of the SF6 of a substation
Brief performance data
| Performance data - EconiQ retrofill for gas-insulated lines ELK-3 | 420 kV | 550 kV | |
|---|---|---|---|
| CO2 equivalent relative reduction to SF6 | % | 98.8 | 98.8 |
| Rated nominal value Um | kV | 420 | 550 |
| Power frequency withstand voltage | kV | 650 | 740 |
| Rated switching impulse withstand voltage (250/2500 µs) | kV | 1050 | 1300 |
| Rated lightning impulse withstand voltage (1.2/50 µs) | kV | 1425 | 1675 |
| Rated current at 40°C (50Hz, 60Hz) | A | 4000, 5000 | 4000, 5000 |
| Rated short time withstand current/duration | kA/s | 63/3 | 63/3 |
| Rated peak-withstand current | kA | 171 | 171 |
| Temperature range | °C | -25/+40 | -25/+40 |
| Type of installation | Indoor/Outdoor | Indoor/Outdoor |
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