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Published in:
08-11-2023 | Originalarbeit
Analyzing the environmental impacts of a 145 kV GIS over its complete lifecycle
Published in: e+i Elektrotechnik und Informationstechnik | Issue 7-8/2023
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Abstract
High-voltage switchgears are a vital equipment to ensure the grid operation, whose impact on the environment can be calculated with a Life Cycle Assessment. Removing SF6 helps to reduce the carbon footprint of the switchgear but it usually deteriorates the other impacted categories.
This work compares the impact of two 145 kV GIS: one based on SF6 and one with a C4-FN-based mixture as insulating and arc-extinguishing media. Using a C4-FN mixture, the footprint of the equipment is mostly reduced to manufacturing emissions and electricity consumption in service. The limitation of the mass increase appears to be key to minimize all environmental impacts, including the effect on climate change.
Some parameters of the assessment are also discussed to highlight the variability of the results depending on the user’s requirements, even for a given layout, e.g., due to the low-voltage and instrument transformer specification.
The use of recycled or recyclable material is also distinguished. Both are very important, however, only the first one really reduces the carbon footprint of the solution. The evolution in the coming decades of the electricity generation mix is also discussed and cannot be considered in the calculation. Overall, the manufacturing phase should consider real figures and avoid double counting.