Usage of Sulphur Hexaflouride (SF6)
In switchgears, transformers and gas-insulated switching stations, sulphur hexafluoride (SF6) is used. Due to its excellent insulating and arc properties, this gas is a key fuel for 50Hertz. At the same time though, SF6 has very high greenhouse potential. Therefore, during transport, storage and use, this gas must be handled with the appropriate sensitivity. The requirements of the 2014 Revised European F-Gas Regulation are complied with. Since 2005, 50Hertz has applied the “Voluntary commitment on the part of SF6 manufacturers and users”. It aims to reduce the measured loss rate for the entire inventory of 0.8 percent in 2004 to 0.6 percent by 2020. As a result of conscious internal monitoring of the operation and maintenance of our insulated facilities, we were already significantly below our own commitment at a SF6-loss rate of 0.06 percent in 2017. A new kind of gas-insulated 110-kV switching station is being built at the Berlin Charlottenburg substation. Here, instead of the conventional insulating gas, sulphur hexafluoride (SF6), we are using a gas mixture with far less greenhouse warming potential. The gas mixture with the designation g³ offers the same technical properties as SF6, but is up to 99 percent less harmful in regard to the greenhouse effect.