US 8,616,045 B2 · Method and device for deriving the concentration of a gas dissolved in an electrical insulation oil

Abstract

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.

Claims12

Dependent claims

A method for deriving the concentration of a gas dissolved in an electrical insulating oil (2) of an electrical apparatus, comprising 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,
characterized in that:
measuring comprises taking at successive measuring instants a plurality of measurements of the values of gas concentration in the measuring chamber (4);
deriving comprises 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.

3 more elements

A device for deriving the concentration of a gas dissolved in an electrical insulation oil (2), comprising:

a membrane (5) permeable to the gas, interposed between a container (7) of the oil and a measuring chamber (4) that receives a part of the gas through the membrane (5);
a sensor (6) mounted in the measuring chamber (4) to measure a value of the gas concentration in the measuring chamber (4);
processing means (9) connected to the sensor (6) to derive an estimated value of gas concentration in the oil (2) according to the value measured in the measuring chamber (4), characterized in that the processing means (9) are designed to take, at successive measuring instants, a plurality of measurements of the values of gas concentration in the measuring chamber, and to calculate 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.

Dependencies are inferred from the claim text.

Method and device for deriving the concentration of a gas dissolved in an electrical insulation oil

Life of this patent

Method and device for deriving the concentration of a gas dissolved in an electrical insulation oil

Life of this patent

Abstract

Claims12