Method and a system for determining the density of an insulating gas in an electrical apparatus
US5693873A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1996 |
| Grant date | Dec 2, 1997 |
| Priority date | — |
| Expiry date | Feb 7, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02B13/0655
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and a system for determining the density of an insulating gas in electrical apparatus in the vicinity of parts carrying electrical current, the method comprising the following steps: PA1 a) a reference temperature is measured outside the apparatus and in the vicinity thereof; PA1 b) the current passing through the apparatus is measured, and the temperature rise of the gas above the reference temperature is determined on the basis of gas temperature rise values as a function of current values and of various reference temperatures, said temperature rise values having been previously determined by testing or by a mathematical model; PA1 c) the gas temperature is computed by adding the reference temperature and the temperature rise; PA1 d) the gas pressure inside the apparatus is measured; and PA1 e) the density .rho. of the gas is computed on the basis of equations of state of the gas .rho.=F(T,P) which equations are tabulated data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.