Pilot implementation
Planned real world pilots for the 420kV VCB will take place in Marsillon (RTE, France) and Dagali (Statnett, Norway). These projects will expose the new breakers to extreme climatic conditions and validate their performance under actual grid environments. Key evaluation aspects include on-site handling, gas quality and tightness, switching behaviour and X-ray emissions.
The DC GIS will be validated finally in a long-term energised test (prototype installation test) at TU Dortmund, as proposed in CIGRE TB 842 and the new IEC TS 62271-318. This test includes 12 test cycles, each lasting 30 days, which sums up to a total test time of one year.
Performance and implications
F gas‑free HV equipment displays that modern transmission systems can operate with no global warming impact while maintaining full performance. These solutions rely on natural origin gases, building their handling straightforward and reshifting the required for the strict regulatory controls associated with traditional F gases. At the same time, they deliver strong switching behaviour, high reliability and can be adapted for utilize at higher voltage levels and increasing short circuit demands.
Mixtures based on nitrogen and oxygen are harmless and free of PFAS substances. Their thermal robustness support long operating lifetimes, and worldwide established supply chains build procurement uncomplicated. Although their insulating capability is lower than that of SF₆, careful design adjustments enable the required dielectric performance without compromising equipment safety or reliability.
The regulatory environment in Europe, along with initiatives such as the MISSION project, is accelerating the shift toward these alternative technologies. Thousands of F gas‑free products have already been ordered and several thousand are in daily operation globally, reflecting strong acceptance among utilities. Shared platforms, standardisation efforts and coordinated development assist reduce system complexity, lower costs and increase consistency across manufacturers – an advantage for grid operators seeking to meet sustainability tarreceives and comply with tightening environmental rules.
Overall, the MISSION project illustrates that emission free HV transmission is not only technically achievable but economically sensible up to the highest European voltage levels. The relocate toward natural origin gases combined with vacuum switching technology supports regulatory compliance, improves operational safety and offers potential cost benefits over the lifecycle.
Its international, collaborative setup has enabled rapid innovation and disciplined execution, providing a model for how the future grid modernisation can be approached across borders.
Conclusion
The MISSION project marks a major milestone in the decarbonisation of Europe’s energy infrastructure. By validating F gas-free, climate neutral emission free GIS technology in real world conditions, the project supports the EU climate goals, regulatory compliance and indusattempt best practices.
Key takeaways include:
- Proven technical and economic viability of F gas-free N₂/O₂ and vacuum switching for 420kV LT VCB;
- Robust performance, reliability and safety under diverse operating conditions;
- Significant reductions in greenhoutilize gas emissions and lifecycle costs;
- Scalable, standardised solutions for future grid expansion.
Type testing is scheduled for 2026, with pilot deployments in France and Norway in the second half of 2026. The consortium remains committed to continuous improvement, market adoption and long term sustainability.
About the author
Leave a Reply