What is the maximum acceptable value for Air and/or Carbon Tetra-fluoride found in service-aged SF6 gas?

The maximum acceptable value for Air and/or Carbon Tetra-fluoride found in service-aged SF6 gas is 3.0% volume. This standard is crucial for ensuring the integrity and performance of SF6 gas in electrical equipment. High levels of contaminants, such as air and carbon tetrafluoride, can compromise the gas’s insulation properties and increase the risk of operational failures.

SF6, or sulfur hexafluoride, is widely used in electrical switchgear due to its excellent dielectric properties. However, as the gas ages, it can mix with other substances, which can affect its performance. The threshold of 3.0% volume is set to ensure that the SF6 gas remains effective for insulation and arc-extinguishing applications.

Maintaining SF6 gas purity below this threshold helps prevent equipment malfunctions and enhances the overall safety and reliability of the electrical systems using this gas. Regular monitoring for contaminants ensures compliance with industry standards and optimal operation of SF6-insulated equipment.