Method and apparatus for monitoring SF6 gas and electric...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system

Reexamination Certificate

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Reexamination Certificate

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11335569

ABSTRACT:
A method for detecting loss of SF6 gas from electrical utility apparatus determines a molar ratio of gas in a container at an initial time and of gas in the container at a subsequent time. Measurement of temperature is determined by averaging ambient temperature and temperature of the surface of the container. The initial values of pressure and temperature define the initial value of n as follows:in-line-formulae description="In-line Formulae" end="lead"?no=Pgas o/Tgas oin-line-formulae description="In-line Formulae" end="tail"?The value at a subsequent time isin-line-formulae description="In-line Formulae" end="lead"?nn=Pgas n/Tgas nin-line-formulae description="In-line Formulae" end="tail"?The molar ratio can be defined asin-line-formulae description="In-line Formulae" end="lead"?nn
oor as no
n.in-line-formulae description="In-line Formulae" end="tail"?

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patent: 5693873 (1997-12-01), Thuries et al.
patent: 6205846 (2001-03-01), Dupraz et al.
patent: 6263914 (2001-07-01), Meyer et al.
patent: 6651483 (2003-11-01), Meyer et al.

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