Title :
Non intrusive method for the assessment of SF6/N2 gas mixture ratio
Author :
Dupraz, J.P. ; Montillet, G.F.
Author_Institution :
Alstom Res. Center, Alstom T&D S.A., Villeurbanne, France
Abstract :
The quest for the proper mix ratio with time in SF6/N2 gas circuit breakers has always been a problem. This paper brings a solution by tackling the gas mix thermodynamic state equations. We present here the study made on the pressure, temperature, density and gas mixture ratio. The knowledge of the phenomena is associated with the determination of the first three of the four variables listed above, a set of four equations and the solution for the gas mix ratio. The selection of the sensors is described. The main advantage is that it is a non-intrusive method and can be performed online with sensors and electronic instrumentation of today´s technology.
Keywords :
SF6 insulation; circuit breakers; equations of state; gas insulated switchgear; gas mixtures; SF6-N2; electronic instrumentation; gas mixture ratio; nonintrusive method; sensors; thermodynamic state equations; Circuit breakers; Dielectric breakdown; Equations; Monitoring; Performance evaluation; Pollution measurement; Sensor phenomena and characterization; Switches; Temperature sensors; Thermodynamics;
Conference_Titel :
Transmission and Distribution Conference and Exposition, 2003 IEEE PES
Print_ISBN :
0-7803-8110-6
DOI :
10.1109/TDC.2003.1335375
