Switchgear Testing

Optimisation SF6 handling procedures during on-site testing and commissioning for GIS

  1. Gas compartments prefilled with SF6 at a pressure slightly above the atmospheric pressure for transportation.
  2. Gas compartments optimised on the minimum SF6 quantity for a given functionality: as the lowest achievable SF6 recovery pressure is defined, the SF6 mass released to the atmosphere is directly proportional to the size of the gas compartment.
  3. Use of cable plugs for the connection of high-voltage cables: no need for full SF6 recovery and opening the gas compartment when connecting the high-voltage cables to the GIS. The cable compartment includes a socket and the cables are just plugged in.
  4. Use of power VT to energise from the low-voltage side during high voltage tests: no need for SF6 handling to connect the high-voltage source for testing. After the high-voltage test the power VT can be used as a standard instrument transformer.
  5. Use of bushing connections for high-voltage tests: no need for SF6 handling to connect the high voltage source for testing. However some limitations are introduced in relation to the partial discharge test performed on-site.

In pic shown a SF6 handling process and equipments form DILO company.

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