Method and a system for determining the density of an insulating gas in an electrical apparatus

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: a) a reference temperature is measured outside the apparatus and in the vicinity thereof; b) the current pas...

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Bibliographic Details
Main Authors THURIES; EDMOND, DUPRAZ; JEAN-PIERRE
Format Patent
LanguageEnglish
Published 02.12.1997
Edition6
Subjects
BASIC ELECTRIC ELEMENTS
BOARDS, SUBSTATIONS, OR SWITCHING ARRANGEMENTS FOR THE SUPPLYOR DISTRIBUTION OF ELECTRIC POWER
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE DEVICES
GENERATION
RELAYS
SELECTORS
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Summary: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: a) a reference temperature is measured outside the apparatus and in the vicinity thereof; 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; c) the gas temperature is computed by adding the reference temperature and the temperature rise; d) the gas pressure inside the apparatus is measured; and 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.
Bibliography:Application Number: US19960598192