Introduction: The scope of this work covers the effective gas capture, re-use and sealing techniques of SF6 gas in a HV GIS circuit breaker. National Grid loses in the region of 12,000kg of SF6 every year, due to the sheer amount of SF6 switchgear there is installed on the Transmission system. This equates to nearly 30% of National Grids UK carbon emmissions. There are a few installations that classfiy as the worst leakers for National Grid. These are often where it is incredibly difficult to obtain an outage, or where leak sealing techniques have proven ineffective.

Objectives:

The projects objectives are in line with the tasks:

• Produce a retrofit solution for SF6 Capture on HV switchgear
• Identify a methodology for sealing SF6 leaks on HV switchgear
• Identify a methodology for Gas cleansing
• Identify a methodology and develop a quality standard for SF6 re-use
• Identify a methodology for interpretation of contaminates of SF6 gas
• Develop a solution that seals SF6 leaks on HV switchgear
• Develop a solution for Gas Cleansing
• Develop a solution for SF6 gas re-use
• Develop a solution for interpretation of contaminates in SF6 gas

Expected Benefits: The project will be successful if National Grid:

• Produce a retrofit solution for SF6 Capture on HV switchgear

• Identify a methodology for sealing SF6 leaks on HV switchgear

• Identify a methodology for Gas cleansing

• Identify a methodology and develop a quality standard for SF6 re-use

• Identify a methodology for interpretation of contaminates of SF6 gas

• Develop a solution that seals SF6 leaks on HV switchgear

• Develop a solution for Gas Cleansing

• Develop a solution for SF6 gas re-use

• Develop a solution for interpretation of contaminates in SF6 gas

• Develop business implementation documents for all developed solutions