Description and operation
SF
6
gas monitoring
M20--002EN03
4/10
02--2011
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relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is
provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is
strictly prohibited.
GRID
Gas pressure and density
Introduction
The electrical characteristics of switchgear depend on the density of SF
6
gas
i.e. the mass of gas pumped into a compartment of a given capacity.
Constant
temperature
At constant temperature, an increase of gas density results in a higher gas
pressure against the walls of compartment.
Constant density
At constant density, with an invariable compartment volume, the pressure
changes in the same way as the temperature. Since the gas density remains
invariable owing to the fact that no modification occurs in the quantity of gas
or the volume of the relevant compartment, the electrical characteristics of the
switchgear will remain unchanged.
Conclusion
Since it is difficult to measure the gas density directly, it is essential to know
accurately its absolute pressure and temperature.
Summary of Contents for FKG1X
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