Gas Insulated Switchgear

Gas monitoring systems used in GIS according to IEEE

These systems indicate the current SF6 density levels in each individual gas zone.

The different types of gas monitoring:

  • Temperature compensated pressure gauge or switch with alarm contacts
  • Pressure gauge with separate density switches
  • Pressure transducer with separate temperature compensation
  • Density transducer independent of temperature and pressure
  • Pressure and temperature transducer with separate density calculation

Each gas zone should be furnished with a gas density monitoring device capable of signaling a minimum of
two independent alarms. Each device should have electrically independent contacts that operate at the
alarm levels. The low-gas density alarm, which is nominally 5% to 10 % below nominal fill density, should send a signal to the local user’s remote system.

Typical information that can be extracted from gas monitoring:

  • Display of leakage rate in percent per year
  • Time in days until first low gas alarm stage will be reached
  • Time in days until the minimum functional density alarm stage will be reached

Pic show gas density monitor mounted on the GIS enclosure. This type displays temperature compensated
pressure with a simple to read dial and with color codes


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