Method and apparatus for monitoring SF6 gas and electric utility apparatus
US7257496B2 · kind B2 · utility
5Cited by
7References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 20, 2006 |
| Grant date | Aug 14, 2007 |
| Priority date | — |
| Expiry date | Feb 4, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02B13/0655
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for detecting loss of SF6 gas from electrical utility apparatus determines a molar ratio of gas in a container at an initial time and of gas in the container at a subsequent time. Measurement of temperature is determined by averaging ambient temperature and temperature of the surface of the container. The initial values of pressure and temperature define the initial value of n as follows:no=Pgas o/Tgas oThe value at a subsequent time isnn=Pgas n/Tgas nThe molar ratio can be defined asnn/no or as no/nn.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.