JPH0633047U - Gas measuring device in oil - Google Patents

Abstract

(57) [Abstract] [Purpose] To measure the combustible gas in oil accurately in a short time without being affected by the liquid component of the deterioration product extracted from insulating oil. [Structure] An extraction container 2 for extracting a flammable gas in an insulating oil 1, an air pump 3 for feeding carrier air into the extraction container 2 from the outside through a pipe 4, and a flammable gas component extracted by the carrier air. Gas filter for removing the liquid component of the deterioration product extracted together with the gas filter 1
1, a combustible gas sensor 5 that detects the concentration of the combustible gas from which the liquid component of the deterioration product has been removed, and a signal that is proportional to the detected gas concentration of the combustible gas are converted to the concentration of the combustible gas in oil. It is characterized by including a signal processing unit 6 and a display unit 7 for displaying according to the gas concentration.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 SUMMARY OF THE INVENTION The present invention is an oil-filled electrical device such as an oil-filled transformer for the purpose of early detection of abnormalities such as local overheating and partial discharge that occur inside the device. The present invention relates to an in-oil gas measuring device for measuring the concentration of a target gas component dissolved in oil.

[0002]

[Prior art]

 Fig. 3 is a diagram showing the outline of the configuration of a conventional gas-in-oil measuring device for an oil-filled electric device such as a transformer. In this figure, 1 is a combustible gas component to be measured by the gas-in-oil measuring device. Insulation oil containing 2 is an extraction container for extracting the insulation oil 1 from oil-filled electrical equipment to extract combustible gas, 2a is its cap, 2b is an upper space, 3 is an air pump, The air is sucked in as carrier air, and the carrier air is sent to the extraction container 2 through the pipe 4. 5 is a combustible gas sensor for detecting the combustible gas component extracted from the insulating oil 1 by the carrier air sent by the air pump 3, 6 is a signal processing unit for converting the signal of the combustible gas sensor 5, Reference numeral 7 is a display unit for displaying a signal from the signal processing unit 6 in an analog value or a digital value, 8 is a main body of a gas measuring device in oil for accommodating the air pump 3, the signal processing unit 6 and the display unit 7, 9 Is an exhaust port that is applied to the extraction container 2 and outputs a combustible gas component to the outside. The arrows in the figure show the flow of carrier air.

Next, the operation will be described. In FIG. 3, the cap 2a is attached to the extraction container 2 in which the insulating oil 1 such as the transformer is collected, and air is sucked as carrier air from the outside of the device by the air pump 3, and the carrier air is put into the extraction container 2 through the pipe 4. Sent in. Then, the combustible gas component contained in the insulating oil 1 is bubbled with carrier air to be extracted into the upper space 2b in the extraction container 2. The extracted combustible gas component is detected by the combustible gas sensor 5 and outputs a voltage signal proportional to the gas concentration. The voltage signal is converted into a flammable gas concentration in oil by the signal processing unit 6, and is displayed on the display unit 7 as an analog value or a digital value according to the gas concentration. The carrier air containing the combustible gas component detected by the combustible gas sensor 5 is discharged from the exhaust port 9 formed in the cap 2 a of the extraction container 2.

Since the sample insulating oil measured by the gas-in-oil measuring device as described above is collected from an operating electric device or the like, the insulating oil 1 It is known that the insulating oil 1 collected from an electric device or the like that is in operation generally contains liquid components such as aldehydes, ketones, and alcohols, which are deterioration products.

[0005]

[Problems to be solved by the device]

 However, in the conventional gas measuring device in oil configured as described above, during measurement, liquid components such as aldehydes, ketones and alcohols, which are the above-mentioned deterioration products, are extracted from the insulating oil 1 together with the combustible gas components. However, there is a problem that the combustible gas sensor 5 detects the combustible gas component and the liquid component at the same time, and outputs the concentration value which is larger than the actual concentration of the combustible gas component.

As a prior art example, for example, JP-A-55-158534 is used to remove water in a sample gas, and JP-A-63-183547 is used to provide a desiccant in the vicinity of a gas sensor element. As a sensor provided with a filter using fibrous activated carbon as a sensor for detecting the CO gas concentration in the room, Japanese Utility Model Laid-Open No. 63-181859, porous porous material as a highly volatile organic carbon separating agent for separating and detecting volatile carbon. Japanese Patent Application Laid-Open No. 62-76459 discloses the one using the limmer beads.

The present invention has been made to solve the above problems, and even when the combustible gas sensor simultaneously detects the combustible gas component and the liquid component of the deterioration product during the measurement. The purpose is to obtain an in-oil gas measuring device that does not output a concentration value that is excessively higher than the actual flammable gas component concentration.

[0008]

[Means for Solving the Problems]

 The in-oil gas measuring device according to the present invention is a pre-stage of the above-mentioned combustible gas sensor in the middle of a pipe that connects the combustible gas sensor with an extraction container for extracting combustible gas in insulating oil collected from an oil-filled electrical device. In addition, a gas filter is installed to remove interfering components, which are liquid components of the degradation products.

[0009]

[Action]

 In the device for measuring gas in oil according to the present invention, a gas filter for removing interfering components is installed in the middle of the pipe connecting the extraction container and the combustible gas sensor, so that the combustible gas components are extracted from the insulating oil. By removing the liquid component of the deteriorated product by adsorption or the like, it is possible to prevent the output of a concentration value that is excessively higher than the actual concentration of the combustible gas component.

[0010]

【Example】

 Embodiment 1 An embodiment of the present invention will be described below. FIG. 1 is a schematic configuration diagram of an in-oil gas measuring device according to an embodiment of the present invention. In FIG. 1, 1 to 9 are the same as the configuration of the conventional technique in FIG. 3, so the description thereof is omitted, but in the present embodiment, the combustible gas sensor 5 is located outside the extraction container 2, that is, in oil. It is incorporated in the gas measuring device body 8. Reference numeral 10 is a pipe that connects the extraction container 2 and the combustible gas sensor 5, and in the middle of the pipe, that is, in the upstream of the combustible gas sensor 5, an interfering component that removes liquid components such as aldehydes, ketones, and alcohols that are deterioration products. A gas filter 11 for removal is installed. The details of the gas filter 11 will be described below with reference to FIG.

In FIG. 2, 12 is a gas filter container, 12 a is its container cap, 13 is a column packing material that adsorbs deterioration products and at the same time allows a flammable gas to pass therethrough, and 14 contains the column packing material 13. The packing material container 15 is a glass wool that prevents the column packing material 13 from scattering, and 16 is the column cap 13 that keeps the container cap 12a and the packing material container 14 confidential. An O-ring 17 and a membrane filter 17 that double prevent the column packing 13 from dropping or scattering.

Next, the operation of FIG. 1 will be described with reference to FIG. In FIG. 1, the operation until the combustible gas component contained in the insulating oil 1 is extracted into the upper space 2b in the extraction container 2 is the same as the conventional operation. During the extraction of flammable gas components, liquid components such as aldehydes, ketones, alcohols and other degradation products are also extracted.

The combustible gas extracted from the insulating oil 1 and the deterioration products such as aldehydes, ketones and alcohols are fed into the gas filter container 12 of the gas filter 11 for removing the interfering components through the pipe 10. Therefore, the column packing 13 adsorbs the deterioration product and at the same time allows the flammable gas to pass therethrough. The combustible gas that has passed is guided to the combustible gas sensor 5.

The combustible gas sensor 5 detects the combustible gas component that has passed through the gas filter 11 for removing the interfering component, and outputs a voltage signal proportional to the gas concentration. The voltage signal is converted into a flammable gas concentration in oil by the signal processing unit 6 and displayed on the display unit 7 as an analog value or a digital value according to the gas concentration. Further, the carrier air containing the combustible gas component detected by the combustible gas sensor 5 is discharged from the exhaust port 9 provided in the main body of the in-oil gas measuring device 8.

Further, deterioration products such as aldehydes, ketones and alcohols are vaporized by bling and extracted from the insulating oil together with the combustible gas, and can be continuously removed every time when passing through the interfering component removing gas filter. If the column packing 13 adsorbs / deteriorates the deteriorated product by repeating the measurement with this device, the column packing 13 and the glass container 15 containing the glass container 15 are simply replaced to measure. It will be possible.

The gas filter 11 for removing an interfering component described here is the adsorption type filler or porous polymer beads, which is generally known as a column filler of a gas chromatograph, collected in a fixed amount of container, and the contents are scattered. To prevent this, as shown in FIG. 2, the container mouth is held with glass wool 15 or absorbent cotton. Further, the gas filter 11 may be configured by using one type of the above-mentioned porous polymer beads, or may be configured by mixing several types of porous polymer beads. Further, the gas filter 11 may be configured by using one type of adsorption type filler, or may be configured by mixing several types of adsorption type fillers.

[0017]

【The invention's effect】

 As described above, the present invention has a gas filter for removing an interfering component, which is a liquid component of a deterioration product, in the middle of a pipe connecting an extraction container of an in-oil gas measuring device and a combustible gas sensor, in front of the combustible gas sensor. As a result, the liquid component of the liquid deterioration product extracted from the insulating oil together with the combustible gas component is removed by the gas filter for removing the interfering component, and the concentration value is higher than the actual target gas component concentration. It will not be output anymore, and the concentration of the target gas component can be accurately measured.

Further, by installing the combustible gas sensor outside the extraction container, the insulating oil will not adhere to the combustible gas sensor even if the extraction container falls over, and therefore the combustible gas sensor Sensitivity does not decrease and it cannot be detected.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a gas-in-oil measuring apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a gas filter for removing an interfering component in FIG.

FIG. 3 is a schematic configuration diagram of a conventional gas measuring device in oil.

[Explanation of symbols]

 1 Insulating oil 2 Extraction container 3 Air pump 4 Pipe 5 Combustible gas sensor 6 Signal processing unit 7 Display unit 8 Gas in oil measuring device body 9 Exhaust port 10 Pipe 11 Gas filter

Claims (1)

[Scope of utility model registration request] 1. An extraction container for sending air as carrier air into insulating oil collected from an oil-filled electric device to forcibly extract a combustible gas component dissolved in the insulating oil,
An air pump that sends carrier air to the insulating oil in the extraction container through a pipe, a combustible gas sensor that detects the concentration of the extracted combustible gas component, and a signal processing unit that processes the output of this combustible gas sensor. In the oil-in-gas measuring device having a display unit for displaying a signal from the signal processing unit in an analog value or a digital value according to a gas concentration, the combustible gas sensor is installed outside the extraction container, and An in-oil gas measuring device comprising a gas filter for removing a liquid component of a deterioration product contained in the insulating oil, in front of the combustible gas sensor.