Summary
Gas-insulated switchgear (GIS) systems are designed for service lifetimes of several decades while experience from SF6 systems has shown reliable operation for more than 40 years. The introduction of eco-friendly insulating gases, particularly C4F7N mixtures, for transmission applications, requires assessing the long-term compatibility between the gas and the GIS materials. Materials such as epoxy resins, elastomers, metals, and polymers when exposed to the insulating gas, may lead to the decomposition of the gas, material degradation, and reduced equipment performance. At present, no dedicated standards exist for conducting compatibility tests with fluorinated insulating gases. This work reviews the existing standards, technical guides, and published literature to support the selection of appropriate test parameters. Thermal and electro-thermal tests were conducted using the 5/13/82% C4F7N/O2/CO2 gas mixture and samples of ethylene propylene diene terpolymer (EPDM) and epoxy resin taken from actual
Read more Read lessGIS components. For each test, the condition of the gas and material were assessed using gas chromatography–mass spectrometry (GC-MS) and surface analysis techniques respectively, showing increased gas–material interaction especially at elevated test temperatures.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | D1_11549_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | United Kingdom |
| Study committees | |
| File size | 984 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
MICHELARAKIS Michail - Cardiff University United Kingdom; SINGH Sukhwinder - Cardiff University United Kingdom; CLARK David - Cardiff University United Kingdom; HADDAD Adberrahmane - Cardiff University United Kingdom; WILSON Gordon - National Grid Electricity Transmission PLC United Kingdom; WALDRON Mark - National Grid Electricity Transmission PLC United Kingdom
Keywords
