{"id":215811,"date":"2025-12-02T08:11:35","date_gmt":"2025-12-02T08:11:35","guid":{"rendered":"https:\/\/siriusenergy.dk\/?p=215811"},"modified":"2026-02-10T05:15:38","modified_gmt":"2026-02-10T05:15:38","slug":"how-to-commission-sf6-free-high-voltage-systems-safely-and-successfully","status":"publish","type":"post","link":"https:\/\/siriusenergy.dk\/en\/how-to-commission-sf6-free-high-voltage-systems-safely-and-successfully\/","title":{"rendered":"How to Commission SF\u2086-Free High-Voltage Systems Safely and Successfully\u00a0"},"content":{"rendered":"

How to Commission SF\u2086-Free High-Voltage Systems Safely and Successfully<\/span><\/span>\u00a0<\/span><\/strong><\/h1>\n

\"\"<\/p>\n

The energy sector is moving quickly toward SF\u2086-free gas-insulated switchgear (GIS). New systems using clean air, g\u00b3, fluoroketones, and CO\u2082\/N\u2082 blends offer a drastically lower environmental footprint \u2014 but they also introduce new requirements for installation, testing, and commissioning.<\/p>\n

While the core principles of high-voltage engineering remain the same, SF\u2086-free systems behave differently. Gas pressures, handling procedures, leak testing, and documentation all require updated methods. And the safe execution of these methods depends heavily on the competence of the people on site.<\/p>\n

And as always, safety depends on\u00a0<\/span>the competence of the people on site<\/span><\/b>.<\/span>\u00a0<\/span><\/span><\/p>\n

This is where Sirius Energy\u2019s approach becomes meaningful.<\/span>\u00a0<\/span><\/span><\/p>\n

All our consultants are maskinmestre \u2014 a Danish engineering profession combining mechanical, electrical, operational, and safety-based training. Some have additional HSE qualifications. This makes them uniquely suited for commissioning tasks that require both technical precision and safe, controlled execution.<\/p>\n

In this blog, we look at what SF\u2086-free commissioning really requires \u2014 and how project owners can ensure safe-to-energise, compliant results.<\/p>\n

1. Commissioning SF\u2086-Free GIS: A New Set of Practical Requirements<\/span><\/span>\u00a0<\/span><\/strong><\/h2>\n

Commissioning SF\u2086-free equipment is not simply \u201cold tasks with a new gas.\u201d
\nSeveral critical steps change:<\/p>\n

Gas quality and purity must be verified differently<\/span><\/span>\u00a0<\/span><\/strong><\/p>\n

Alternative gases have different:<\/span><\/span>\u00a0<\/span><\/p>\n

    \n
  • moisture tolerances<\/span><\/span>\u00a0<\/span><\/li>\n
  • density curves<\/span><\/span>\u00a0<\/span><\/li>\n
  • leak detection sensitivities<\/span><\/span>\u00a0<\/span><\/li>\n
  • decomposition signatures<\/span><\/span>\u00a0<\/span><\/li>\n<\/ul>\n

    Tools and test methods must match the specific gas type.<\/p>\n

    Gas-handling equipment must be compatible<\/span><\/span>\u00a0<\/span><\/strong><\/p>\n

    Recovery units, hoses, fittings, filters, and sensors all need to be designed for the new gas mixture. Using traditional SF\u2086 equipment is often not allowed.<\/p>\n

    Pressurisation and monitoring follow updated limits<\/span><\/span>\u00a0<\/span><\/strong><\/p>\n

    SF\u2086-free gases often require higher nominal pressures to achieve equal dielectric strength.
    \nThis means:<\/p>\n

      \n
    • new pressure thresholds,<\/span><\/span>\u00a0<\/span><\/li>\n
    • updated monitoring settings,<\/span><\/span>\u00a0<\/span><\/li>\n
    • revised alarm levels.<\/span><\/span>\u00a0<\/span><\/li>\n<\/ul>\n

      Technicians must understand new behaviour curves<\/span><\/span>\u00a0<\/span><\/strong><\/p>\n

      Gas temperature, density, and humidity influence performance differently in SF\u2086-free systems.<\/span><\/span>\u00a0<\/span><\/p>\n

      In other words, the world is moving in the same direction:<\/span><\/span>
      \nCommissioning SF\u2086-free systems requires updated knowledge, updated tools, and updated discipline.<\/span><\/span><\/strong><\/p>\n

      2. Planning and Pre-Commissioning: Getting It Right Before Work Begins<\/h2>\n

      A successful SF\u2086-free project often succeeds\u2014or fails\u2014before installation even starts.<\/p>\n

      At Sirius Energy, pre-commissioning typically includes:<\/p>\n

      Reviewing manufacturer documentation<\/span><\/span>\u00a0<\/span><\/strong><\/p>\n

      Each alternative gas has its own handling requirements. We align with the latest IEC 62271-4 and manufacturer guidelines before work begins.<\/span><\/span>\u00a0<\/span><\/p>\n

      Identifying gas-specific risks<\/span><\/span>\u00a0<\/span><\/strong><\/p>\n

      Including:<\/span><\/span>\u00a0<\/span><\/p>\n

        \n
      • pressurisation hazards,<\/span><\/span>\u00a0<\/span><\/li>\n
      • oxygen displacement,<\/span><\/span>\u00a0<\/span><\/li>\n
      • storage temperature limits,<\/span><\/span>\u00a0<\/span><\/li>\n
      • ventilation requirements.<\/span><\/span>\u00a0<\/span><\/li>\n<\/ul>\n

        Ensuring certified gas-handling equipment is available<\/span><\/span>\u00a0<\/span><\/strong><\/p>\n

        Including:<\/span><\/span>\u00a0<\/span><\/p>\n

          \n
        • calibrated leak detectors,<\/span><\/span>\u00a0<\/span><\/li>\n
        • approved filling\/recovery units,<\/span><\/span>\u00a0<\/span><\/li>\n
        • correct fittings and hoses,<\/span><\/span>\u00a0<\/span><\/li>\n
        • gas purity test instruments.<\/span><\/span>\u00a0<\/span><\/li>\n<\/ul>\n

          Preparing site-specific risk assessments<\/span><\/span>\u00a0<\/span><\/span><\/span><\/strong><\/p>\n

          Especially important when:<\/span><\/span>\u00a0<\/span><\/p>\n

            \n
          • multiple contractors operate simultaneously,<\/span><\/span>\u00a0<\/span><\/li>\n
          • gas storage areas are limited,<\/span><\/span>\u00a0<\/span><\/li>\n
          • hot works or confined spaces are involved.<\/span><\/span>\u00a0<\/span><\/li>\n<\/ul>\n

            This groundwork ensures that installation teams can work safely and efficiently from day one.<\/span><\/span>\u00a0<\/span><\/p>\n

            3. Installation, Gas Handling, and Testing on Site<\/h2>\n

            Once installation begins, the commissioning workflow becomes extremely hands-on.<\/span><\/span>\u00a0<\/span><\/p>\n

            Gas filling under controlled conditions<\/span><\/span>\u00a0<\/span><\/strong><\/p>\n

            Alternative gases often require slow filling at controlled temperatures and pressures.<\/span><\/span>
            \nMaskinmestre excel here because they understand:<\/span><\/span><\/p>\n

              \n
            • thermodynamic behaviour,<\/span><\/span>\u00a0<\/span><\/li>\n
            • pressure system safety,<\/span><\/span>\u00a0<\/span><\/li>\n
            • leak path risks,<\/span><\/span>\u00a0<\/span><\/li>\n
            • equipment tolerances.<\/span><\/span>\u00a0<\/span><\/li>\n<\/ul>\n

              Leak testing using approved detectors<\/span><\/span>\u00a0<\/span><\/strong><\/p>\n

              Some gases require trace gas methods or higher-sensitivity detectors.<\/span><\/span>
              \nTesting must match IEC 62271-203\/304 requirements.<\/span><\/span><\/p>\n

              Monitoring moisture, temperature, and density<\/span><\/span>\u00a0<\/span><\/strong><\/p>\n

              Dielectric strength depends heavily on moisture content. \nValues must remain within manufacturer-approved limits before energisation is allowed.<\/p><\/blockquote>\n

              Integrated QA<\/span><\/span>\u00a0<\/span><\/strong><\/p>\n

              Every test result \u2014 pressure, purity, temperature, leak rate \u2014 must be:<\/span><\/span>\u00a0<\/span><\/p>\n

                \n
              • recorded,<\/span><\/span>\u00a0<\/span><\/li>\n
              • verified,<\/span><\/span>\u00a0<\/span><\/li>\n
              • signed off,<\/span><\/span>\u00a0<\/span><\/li>\n
              • stored traceably.<\/span><\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                This documentation is often required by the utility, regulator, and manufacturer \u2014 and becomes part of the asset\u2019s lifetime record.<\/span><\/span>\u00a0<\/span><\/p>\n

                4. HSE in the SF\u2086-Free Era: New Gases, New Safety Considerations<\/span><\/span><\/strong><\/h2>\n

                One of the misconceptions in the industry is that SF\u2086-free automatically means \u201clower risk.\u201d<\/span><\/span>
                \nEnvironmentally, yes.<\/span><\/span>
                \nOperationally? Not always.<\/span><\/span><\/p>\n

                Some gases operate at higher pressures.
                Some mixtures require ventilation planning.
                Others involve different by-products or handling rules.<\/p><\/blockquote>\n

                This makes HSE involvement absolutely essential.<\/b><\/span><\/span>\u00a0<\/span><\/p>\n

                What Sirius typically coordinates on site:<\/span><\/span>\u00a0<\/span><\/p>\n

                  \n
                • pressure system risk assessments (PED alignment)<\/span><\/span>\u00a0<\/span><\/li>\n
                • ATEX considerations where applicable<\/span><\/span>\u00a0<\/span><\/li>\n
                • emergency response procedures for leaks<\/span><\/span>\u00a0<\/span><\/li>\n
                • safe work coordination when several contractors share a GIS hall<\/span><\/span>\u00a0<\/span><\/li>\n
                • gas recovery, storage, and disposal plans<\/span><\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                  With maskinmestre who already think operationally and safely \u2014 and some with formal HSE Coordinator certification \u2014 Sirius ensures that HSE is integrated into commissioning rather than added as a late-stage \u201ccheck.\u201d<\/span><\/span>\u00a0<\/span><\/p>\n

                  Not replacing HSE.
                  \nNot doing their job.
                  \nBut collaborating \u2014 with real technical understanding behind every decision.<\/p>\n

                  5. The Safe-to-Energise Process: Final Step Before Switching On<\/h2>\n

                  Sirius Energy uses a structured Safe-to-Energise workflow developed over multiple high-voltage projects.
                  \nIt includes:<\/p>\n

                  \u2714<\/strong> Full validation of all test results<\/span><\/span>\u00a0<\/span>
                  \n<\/strong>\u2714<\/strong> Final physical inspections<\/span><\/span>\u00a0<\/span>
                  \n<\/strong>\u2714<\/strong> Confirmation of access control and barriers<\/span><\/span>\u00a0<\/span>
                  \n<\/strong>\u2714<\/strong> HSE sign-offs<\/span><\/span>\u00a0<\/span>
                  \n<\/strong>\u2714<\/strong> QA documentation assembled and submitted<\/span><\/span>\u00a0<\/span>
                  \n<\/strong>\u2714<\/strong> Approval from the client\u2019s responsible engineer<\/span><\/span>\u00a0<\/span><\/strong><\/p>\n

                  This creates a transparent, traceable chain between:<\/p>\n

                  This creates a transparent, traceable chain between:<\/span><\/span><\/p>\n

                    \n
                  • \n
                      \n
                    • installation,<\/li>\n
                    • Testing,<\/li>\n
                    • HSE,<\/li>\n
                    • and operation.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                      6. Retrofits: Replacing SF\u2086 Without Replacing the Entire System<\/h2>\n

                      Many utilities cannot replace entire GIS systems right away<\/span><\/span>
                      \r\nFortunately, retrofit solutionssolutions like Hitachi <\/span>Energy's<\/span> <\/span>EconiQ<\/span> <\/span>Retrofill<\/span> and GE's g\u00b3 Retrofit, where existing equipment can be reused with new gas.<\/span><\/span><\/p>\n

                      Sirius Energy supports these projects with:<\/span><\/span>\u00a0<\/span><\/p>\n

                        \n
                      • site readiness and eligibility assessments<\/span><\/span>\u00a0<\/span><\/li>\n
                      • on-site supervision during evacuation and refilling<\/li>\n
                      • commissioning and verification<\/span><\/span>\u00a0<\/span><\/li>\n
                      • QA and HSE documentation<\/span><\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                        Retrofits often reduce environmental impact by over 90%, making them an attractive transitional strategy.<\/p>\n

                        7. Why Maskinmestre Are the Right Fit for SF\u2086-Free Commissioning<\/span><\/span><\/strong><\/h2>\n

                        Sirius Energy\u2019s strength lies in its people.<\/span><\/span>\u00a0<\/span>
                        \nAll our consultants are maskinmestre \u2014 a profession built on:<\/span><\/span>\u00a0<\/span><\/p>\n

                          \n
                        • electrical and mechanical engineering<\/span><\/span>\u00a0<\/span><\/li>\n
                        • operational awareness<\/span><\/span>\u00a0<\/span><\/li>\n
                        • practical problem-solving<\/span><\/span>\u00a0<\/span><\/li>\n
                        • safety mindset<\/span><\/span>\u00a0<\/span><\/li>\n
                        • the ability to adapt across systems<\/span><\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                          Some of them also hold formal HSE qualifications.<\/span><\/span>\u00a0<\/span><\/p>\n

                          This gives project owners confidence that onsite commissioning is handled by professionals who:<\/span><\/span>\u00a0<\/span><\/p>\n

                            \n
                          • understand the equipment,<\/span><\/span>\u00a0<\/span><\/li>\n
                          • understand the risks,<\/span><\/span>\u00a0<\/span><\/li>\n
                          • understand the procedures,<\/span><\/span>\u00a0<\/span><\/li>\n
                          • and understand how to bring technical and safety requirements together.<\/span><\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                            In SF\u2086-free projects, that combination is invaluable.<\/p>\n

                            A New Technology Needs a New Level of Execution<\/span><\/span>\u00a0<\/span><\/strong><\/h2>\n

                            The transition to SF\u2086-free GIS isn\u2019t just a regulatory milestone.<\/span><\/span>
                            \nIt\u2019s a fundamental change in how high-voltage systems are built, tested, and energised.<\/span><\/span><\/p>\n

                            Success requires:<\/span><\/span>\u00a0<\/span><\/p>\n

                              \n
                            • updated technical knowledge,<\/span><\/span>\u00a0<\/span><\/li>\n
                            • disciplined gas-handling procedures,<\/span><\/span>\u00a0<\/span><\/li>\n
                            • strong HSE coordination,<\/span><\/span>\u00a0<\/span><\/li>\n
                            • and rigorous documentation.<\/span><\/span>\u00a0<\/span><\/li>\n
                            • and rigorous documentation.<\/span><\/span><\/li>\n<\/ul>\n

                              But most of all, it requires people who can bridge engineering<\/strong>, operations<\/strong>, and safety<\/strong>.<\/p>\n

                              That\u2019s exactly what Sirius Energy delivers.<\/span><\/span>\u00a0<\/span><\/p>\n

                              About Sirius Energy Infrastructure<\/h2>\n

                              Sirius Energy supports utilities, EPC contractors, and OEMs across Europe with commissioning, site management, retrofit support, and owner\u2019s representation. All our consultants are maskinmestre, combining technical sharpness with operational and safety awareness \u2014 ensuring that SF\u2086-free systems are installed, tested, and energised safely and correctly.<\/p>","protected":false},"excerpt":{"rendered":"

                              Energisektoren bev\u00e6ger sig hurtigt mod SF- fri gasisoleret koblingsudstyr (GIS). De nye teknologier…<\/p>","protected":false},"author":6,"featured_media":215827,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-215811","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"\nS\u00e5dan idrifts\u00e6tter du SF\u2086-fri h\u00f8jsp\u00e6ndingsanl\u00e6g sikkert og korrekt\u00a0<\/title>\n<meta name=\"description\" content=\"Energisektoren bev\u00e6ger sig hurtigt mod SF- fri gasisoleret koblingsudstyr (GIS). 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