Description and Functionalities
Monitoring of SF
6
gas
P20--0001EN/02
2/6
01--2011
© ALSTOM 2010. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be
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
Pressure and d en sity
Introduction
The characteristics of the apparatus depend on the density of the SF
6 gas,
meaning the mass of the mix introduced into a given compartment
volume.
Constant
temperature
At constant temperature
, increased density results in an increase in the
pressure exerted by the mix on the compartment walls.
Constant
density
At constant density
, with the volume of the compartment invariable, the
gas pressure varies in the same way as temperature. The gas density
stays invariable, as the quantity of gas does not change, nor does the
volume of the compartment containing it, and nor do the electrical
characteristics of the eauipment.
Conclusion
As it is difficult to directly measure the density of the gas, the absolute
pressure and pressure and temperature of the mix must be measured with
a high degree of precision.
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