Patent ID: 7184895
Filing Date: 2007-02-27
Classification: G01N,H01H

Abstract:
1. A method of monitoring the proportion X of a component in a gaseous mixture, said gaseous mixture having two components, a first component which is SF 6 and a second component selected from the group consisting of N 2 and CF 4 , and being contained in an electrical switchgear enclosure, said method comprising the steps of: a) measuring the pressure P, the temperature T, and the density ρ of the gas mixture contained in the electrical switchgear enclosure by means of sensors mounted on said enclosure, b) determining said proportion X by processing the measured values of pressure P, temperature T and density ρ in a data-processing unit which delivers as output the proportion X determined by solving the following equations: where A P(SF ρ(N and wherein step a) is carried out without tapping said gas mixture.