The insulation medium of the Blue instrument transformers has no impact on the environment, therefore the Global Warming Potential is zero. SF6 or other fluorinated gases, called F-Gases, are replaced by applying dry synthetic air, so called „clean air“, as an insulation medium for gas-insulated equipment. Clean air consists of 80% nitrogen and 20% oxygen, natural elements in the surrounding atmosphere.
With this new technology, there is no longer an obligation for F-gas reporting. This Reporting is mainly required in the EU. Extensive safety requirements during the handling of F-gases are no longer necessary. The risk of F-gas-emission – which is very low during operation – is completely eliminated.
In parallel, blue instrument transformers are extremely powerful and space saving: They operate reliably at temperatures below minus 50 degree Celsius, without additional heating, and have the same space requirements as SF6-filled voltage transformers, in the same voltage range. Scientific research of Siemens Energy former Siemens and its affiliated company Trench, with more than 70 years of experience in the manufacturing of instrument transformers, made it possible to transfer this innovative technology to a voltage range of 420 kV.