METHOD AND DEVICE FOR DERIVING THE CONCENTRATION OF A GAS DISSOLVED IN AN ELECTRICAL INSULATION OIL

摘要

A method for deriving the concentration of a gas dissolved in an electrical insulating oil (2) comprises the following steps:-preparing a membrane (5) permeable to the gas, interposed between a container (7) of the oil (2) and a measuring chamber (4) that receives a part of the gas through the membrane (5);-measuring the value of gas concentration in the measuring chamber (4);-deriving an estimated value of the concentration of the gas in the oil (2) as a function of the measured value,-the measuring step comprising taking at successive measuring instants a plurality of measurements of the values of gas concentration in the measuring chamber (4);-the deriving step comprising calculating the estimated value of gas concentration in the oil (2), at an instant selected from said measuring instants, according to a non-linear function of the values measured at the selected measuring instant and at one or more of the measuring instants preceding the one selected.