A Solid State Gas Density Monitor for Gas Insulated Substation Equipment

A solid state gas density monitor has been developed for SF6 service in gas-insulated substation equipment that is based on principles and construction techniques similar to ionization-type fire alarms. The monitor has a resolution of .7kPa (.1 psi) at 20°C. and, depending on ion chamber voltage and...

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Bibliographic Details
Published inIEEE transactions on power apparatus and systems Vol. PAS-101; no. 7; pp. 1921 - 1927
Main Authors Saaski, Elric W., Hartl, James C.
Format Journal Article
LanguageEnglish
Published IEEE 01.07.1982
Subjects
Fires
Gas insulation
Geometry
Instruments
Linearity
Monitoring
Solid state circuits
Substations
Sulfur hexafluoride
Voltage
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Summary:A solid state gas density monitor has been developed for SF6 service in gas-insulated substation equipment that is based on principles and construction techniques similar to ionization-type fire alarms. The monitor has a resolution of .7kPa (.1 psi) at 20°C. and, depending on ion chamber voltage and geometry, exhibits a linearity of ±1. to ±4. kPa (±.15 to ±.6 psi) at 20°C. over the density range 0.20 to 0.66 MPa (30 to 95 psia) at 20°C. The monitor incorporates two level contact closure actuated by gas density falling below one of two pre-set alarm limits, and an LCD read-out for visual monitoring and instrument calibration. The display presents density in terms of equivalent psia at 68°F (20°C.).
ISSN:0018-9510
2995-6323
DOI:10.1109/TPAS.1982.317480