JPS59160745A - Detector for gas in oil in oil-immersed apparatus - Google Patents

Abstract

PURPOSE:To detect plural gaseous components dissolved in the insulating oil in an oil-immersed apparatus by separating said gaseous components with a gas permeable material, detecting the separated gases with plural gas sensors and processing arithmetically the outputs therefrom. CONSTITUTION:Valves 13a, 13b which are attached in a gas well part 2 provided to an oil-immersed apparatus 9 are closed and the gaseous components in the oil are permeated and separated from an insulating oil 10 into the part 2 through a gas permeable material 1. When the concn. of the gas in the oil and the concn. of the permeated gas in the part 2 attain an equil. state, the valve 13b is opened to restore atm. pressure in the part 2, then the valve is closed. A gas detecting part 4 is then connected to the valve 13a, and the valve 13a is opened to diffuse the gas in the part 2 of itself. The gaseous components are detected with the plural gas sensors 3 in the part 4. The outputs obtd. from the gas sensors are arithmetically processed with the respective detected characteristic values for each of the gaseous components for each of the gas sensors which are measured and stored preliminarily. The concn. of the gas for each of the plural gaseous components is displayed on a display device 8.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a gas-in-oil detection device for oil-immersed equipment, and in particular to a device for detecting gas in oil in oil-immersed equipment, using a gas permeable material to detect a plurality of gas components dissolved in insulating oil in oil-filled equipment. The present invention relates to a gas-in-oil detection device for oil-immersed equipment that separates gas components and detects a plurality of separated gas components.

[Prior art]

Various devices have been proposed that automatically separate gas components in insulating oil from insulating oil using a gas permeable material, detect this separated gas component with a gas detector, and detect internal abnormalities in oil-immersed equipment.

Gas components generated in this insulating oil due to an internal abnormality in a transformer, for example, include hydrogen H2, -carbon oxide CO1, carbon gas CO0
zhru or methane CH4', acetylene C21-I2,
It is a low-molecular hydrocarbon gas such as ethylene C2H4 and ethane C2H,6. Therefore, most of the gas components permeated through the gas permeable material are these gas components. In addition, the gas concentration in these insulating oils and the gas concentration permeated through the gas permeable material will maintain a certain equilibrium as the partial pressure of each gas if the permeation time is long enough. The concentration of gas in oil can be determined by detecting the gas pressure.

By the way, in order to quantify these multiple gas components that have passed through, it is common to use a so-called gas chromatography device that isolates and detects gas components by chromatographic separation. However, in the case of a gas chromatograph apparatus, in addition to the gas sensor, many parts such as a gas cylinder, switching cocks for gas flow paths, and gas separation fillers are used, making the apparatus expensive and the measurement operation complicated. Furthermore, the maintenance of the device itself is not easy, and since the gas components are measured by contacting them with a gas sensor after chromatographic separation of the gas, it takes a long time to obtain the measurement results.

On the other hand, the simplest way to quantify the permeated gas components is to use a plurality of selective gas sensors, each of which is sensitive to a specific gas, and measure it without chromatographic separation. However, the gas sensors currently in use have poor selectivity.
For this reason, in reality, accurate quantification could not be achieved even if a plurality of gas stations were used as they were.

[Purpose of the invention]

The present invention has been made in view of the above points, and it is an object of the present invention to provide a gas-in-oil detection device for oil-filled equipment that is capable of detecting a plurality of gas components in a short time.

[Summary of the invention]

That is, the present invention provides a gas-in-oil detection device that includes a gas reservoir section that stores a plurality of gas components separated by a gas permeable material, and a gas reservoir section that is connected to the gas reservoir section and that stores a plurality of gas components separated by a gas permeable material. A gas detection section equipped with a plurality of gas sensors (hereinafter referred to as a gas sensor group) that detect each component, and respective output values from the gas sensor group connected to this gas detection section and measuring a plurality of gas components. and a measurement unit that calculates and displays a plurality of gas components from the respective detection characteristic values for each gas component alone for each gas sensor that have been measured and stored in advance by the gas detection unit. That is.

The inventors studied how to detect multiple gas components using a group of gas sensors. The type of gas that you are trying to measure now, that is, the gas type, is A, B, 'C.
and these gases A and B.

Gas sensor ff to detect C: s+, 82.83
In this case, each gas sensor Si, S2, Ss
The results of measuring the detection characteristic values for each of the gases A, B', and C are shown in the table below. And each of these gases A
, B, and C as GA, Gn, and Gc, respectively, and each gas sensor S1 r 82 +8 for a mixture of these gas concentrations ()A, Gn, and Gc.
The output value, which is the measured value in step 3, is Mx as shown in the same table.
, 'Mz and Ma. From this result, each gas sensor S1. S2. The respective output values M1°M2.S3. Ma is
Each gas sensor S+, each gas A of 82.83
, B, and C, the difference between the detection characteristic value and the output value of each gas sensor S++82.83 is M1=GA X (11+GB Xβ+ + () c
X r 1- ・=(1) M2-GA×α2 +GB
xβ2 + Gc X r 2 − (2) Ma = G
Person Xα3 +Gn Xβa+Gc'X γ3...
...The relationship (3) is established. Therefore, these (1)
It is possible to calculate the concentrations of each gas A, B, and C by solving the ternary-dimensional simultaneous equations of equations (3) from Output values M+, M2, M from gas sensor S++82.83
3 should be taken in and subjected to arithmetic processing. That is, the detection characteristic value αl.

α2Iα31β11β21β3Iγl and γ2γ3 are values measured for each gas A, B, and C alone,
The output values M+ 1M2 and M3 are these gases A.

Since the value is obtained by actual measurement of a mixture of B and C, the detection characteristic values for each gas A, B, and C were measured in advance using each gas sensor Sl, S2.83, and this was memorized. and each of these gases A.

A mixture of B and C is applied to each gas sensor SI+82.
The output value M1.83 actually measured. M2.

By calculating M, the gas sensor group S l* 82
It was confirmed that multiple gas A, B, and C components could be detected and quantified using 183. Therefore, in the present invention, the gas-in-oil detection device includes a gas reservoir section that stores a plurality of gas components separated by a gas permeable material, and a gas reservoir section that is connected to this gas reservoir section and that stores a plurality of gas components within the gas reservoir section. A gas detection unit is equipped with a gas sensor group that detects each gas component, and each output value from the gas sensor group connected to this gas detection unit and that measures a plurality of gas components is measured and stored in advance by the gas detection unit. The measuring unit is configured to calculate and display a plurality of gas components from the respective detection characteristic values for each gas component alone for each gas sensor installed.

By doing so, it is possible to obtain a gas-in-oil detection device for oil-filled equipment that is capable of detecting a plurality of gas components in a short period of time.

Note that the above example is based on the detection of three types of gas for ease of understanding.
□ is shown in the case of quantitative determination, but when detecting and quantifying many gases, it is sufficient to solve multidimensional simultaneous equations using many gas sensors, so it is not limited to three types of gases. do not have.

Additionally, gas concentration and detection characteristics may be non-linear depending on the type of gas sensor, but for each gas sensor, the detection characteristic values for each gas component are stored in the microcomputer for the purpose of horizontal use. It is also possible to calculate and determine the amount of each gas from the output value of the gas sensor and the detection characteristic value. The above example is an example for ease of understanding, and the detection characteristics are not necessarily limited to linear cases.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. FIG. 1 shows an embodiment of the invention. In this embodiment, a gas-in-oil detection device is connected to a gas reservoir section 2 that stores a plurality of gas components separated by a gas permeable material 1, and is connected to this gas reservoir section 2, and A gas detection unit 4 provided with a gas sensor group 3 that detects a plurality of gas components, respectively.
and the respective output values from the gas sensor group 3 connected to this gas detection unit 4 and measuring a plurality of gas components, and each gas component for each gas sensor measured and stored in advance by the gas detection unit 4. It is composed of a measuring section 5 that calculates and displays a plurality of gas components from individual detection characteristic values. The measurement unit 5 is replaced by a gas sensor amplifier 6 that amplifies each output value from the gas sensor group 3 and each detection characteristic value for each gas component alone for each gas sensor;
An arithmetic device 7 connected to this gas sensor amplifier 6 and processes a plurality of gas components from output values and detection characteristic values.
and a display device 8 for displaying the calculation results of this arithmetic device 7. By doing this, it becomes possible to detect and quantify multiple gas components in a short time using the gas sensor group 3, and the oil-filled equipment that enables the detection of multiple gas components in a short time A medium gas detection device can be obtained.

That is, insulating oil 10 filled in a case 9 of an oil-filled device is introduced into an oil introduction pipe 12 via a flange valve 11 attached to the case 9.

This oil introduction pipe 12 is provided with a gas reservoir 2 via a gas permeable material 1 that is installed in an oil-tight manner, so that the gas components in the insulating oil 10 introduced into the oil introduction pipe 12 are The gas is permeated and separated by a gas permeable material 1 and stored in a gas reservoir 2. The gas detection section 4 housing the gas sensor group 3 is connected to the gas reservoir section 2 via the on-off valve 13a, but the on-off valve 13a and the gas detection section 4 can be connected by a one-touch joint. socket 14
A and a plug (not shown) were provided. A gas sensor amplifier 6 was connected to the gas detection section 4 via a cable; an arithmetic unit 7 such as a microcomputer device was connected to the gas sensor amplifier 6, and a display device 8 was connected to the microcomputer device. Furthermore, on the measuring section 5 side, which is composed of the gas sensor amplifier 6, the arithmetic device 7, and the display device 8, there is a gas reservoir chamber 15 having the same configuration as the gas reservoir section 2 separately provided on the oil-filled equipment side. has been established. This gas reservoir chamber 15 has a socket l-, which has the same structure as 14a, to which a one-touch joint plug attached to the gas detection unit 4 housing the gas sensor group 3 described above can be connected.
14b was installed.

Then, the gas-in-oil detection device configured as described above is operated as described below to detect and quantify a plurality of gas components.

The needle valve 131j attached to the gas reservoir section 2 is opened and closed, and the valve 13a is closed to allow gas components in the oil to permeate and separate from the insulating oil 10 through the gas permeable material 1 in the gas reservoir section 2. In this case, the gas is permeated for a certain period of time until the gas concentration in the oil and the permeated gas concentration are in equilibrium.
It varies depending on the volume etc. When the concentration of the gas in the oil and the concentration of the permeated gas in the gas reservoir 2 reach an equilibrium state, the needle valve 13b is opened to bring the inside of the gas reservoir 2 to normal pressure, and the needle valve 13b is closed. Next, the gas detection unit 4 is connected to the open/close valve 13a using the one-touch joint socket 14a.
and opens the on-off valve 13a. In this way, the gas components in the gas reservoir section 2 will naturally diffuse into the gas detection section 4 and come into contact with the gas sensor group 3, causing each gas sensor in the gas sensor group 3 to output an output value corresponding to the concentration of the permeated gas. show. This output value is taken into the arithmetic unit 7 via the gas amplifier 6, and is pre-stored in the microcomputer of the arithmetic unit 7. Then, the desired gas concentration for each gas component is calculated and displayed on the display device 8.

Note that the detection characteristic value for each gas component alone for each gas sensor is determined by filling a single component gas of a known concentration up to normal pressure into the gas reservoir chamber 15 provided on the measurement unit 5 side, and inserting it into the socket 1.4 b of the one-touch joint. The gas detection section 4 may be connected to the gas detection section 4 through the gas detection section 4, and the measurement may be performed in the same manner as in the case of measuring the permeated gas described above. In this way, it is possible to obtain the detection characteristic value for each gas component independently for each gas sensor.

Another embodiment of the invention is shown in FIG.

In this embodiment, a diaphragm pump 16 for generating carrier gas and a carrier gas pipe 17 for feeding the carrier gas into the gas reservoir 2 are provided, and the gas in the gas reservoir 2 is forcibly filled with the carrier gas. Gas detection part 4
I sent it to them for measurements. As shown in FIG. 3, the gas detection section 4 was provided with a hole 18 for releasing the carrier gas. In the figure, 19 is a one-touch joint plug.

In this case, multiple gas components are detected and quantified by operating as described below. The needle valve 13b is opened to bring the inside of the gas reservoir 2 to normal pressure, and after the pressure is brought to normal pressure, the IJj is closed. Next, the gas detection unit 4 housing the gas sensor group 3 is connected to the on-off valve 13a by a one-touch joint socket 14a, and the carrier gas pipes 17 are connected to the needle valves 13b, respectively. Then, after opening the on-off valve 13a, the needle valve 13
b is opened, the carrier gas generated from the diaphragm pump 16 flows into the gas reservoir section 2, and the gas components in the gas reservoir section 2 are sent to the gas detection section 4 and brought into contact with the gas sensor group 3. By doing so, the gas sensor group 3 shows an output value corresponding to the concentration of the gas component with which it comes in contact, and this output value is taken into the measurement section 5, and multiple gas components are detected and detected in the same way as in the above case. Quantitated. In this case, since the transmitted gas components are forcibly brought into contact with the gas sensor group 3 for measurement, it is possible to detect gases at low concentrations in a shorter time than in the above-mentioned case of the natural convection method.

The detection characteristic value for each gas component alone for each gas sensor is determined by introducing a single component gas of a known concentration at normal pressure 1 into the gas reservoir chamber 15 provided on the measurement unit 5 side, and then inserting it into the gas reservoir chamber 15 provided on the measurement unit 5 side. It can be determined by connecting the other end to the gas detection unit 4 through the socket 14b and the carrier gas pipe 17 through the connection port, and measuring in the same manner as in the case of measuring the permeated gas described above.

FIG. 4 shows yet another embodiment of the invention. In this embodiment, a six-way switching valve 2 (l) is connected to the gas reservoir 2,
I was able to get the calibration tube 21a to this 60,000 switching valve 20a. Then, the gas sensor group 3 was housed 1~, and the gas detection section 4 was installed on the side of the measurement section 5, so that the permeated gas component introduced into the calibration tube 21a was guided to the gas detection section 4 by the carrier gas pipe 22, 23. . A six-way switching valve 201 with the same structure as the six-way switching valve 20a connected to the gas reservoir section 2 and a calibration tube 21b were installed on the side of the disconnected measuring section 5. In this case, operate as described below. Detection of multiple gas components
Quantify. Open the second dollar valve 24 provided in the gas reservoir 2 to bring the gas reservoir 2 and the calibration tube 21a to normal pressure, and then close the needle valve 24 again when the pressure is at normal pressure. During this period, the six-way switching valve 20a forms a flow path indicated by a solid line in the figure, so that the permeated gas also accumulates in the calibration tube 21a. The carrier gas pipes 22, 23 are then attached to the six-way switching valve 20a via the joints 25a, 25b. In this way, the carrier gas discharged from the diaphragm pump 16 bypasses the calibration tube 21a, flows to the gas detection section 4, and is discharged into the atmosphere as shown by the solid arrow in the figure. When the flow of this carrier gas becomes stable, the 6-way switching valve 20a
is switched to the flow path indicated by the dotted line in the figure, and the gas component that has passed through the calibration tube 21a is caused to flow through the carrier gas to the gas detection section 4 and brought into contact with the gas sensor group 3. By doing this, the output value of the gas component that has passed through is obtained, which is taken into the measuring section 5, and a plurality of waste components can be detected and quantified in the same manner as in the above case.

In this case, the flow rate of the carrier gas can be kept constant during measurement, so a more stable output value can be obtained than in the case described above, and the measurement operation can be simplified.

Note that the detection characteristic value for each gas component alone for each gas sensor is determined by filling a single component gas of a known concentration up to normal pressure into the calibration tube 21b attached to the six-way switching valve 20b on the measurement unit 5 side, and then connecting it to the join I-25C. It can be determined by connecting to the carrier gas pipes 22, 23 through 25d and measuring the gas in the calibration tube 211 in the same manner as the measurement of the permeated gas described above.

As the gas sensors used in each of the following embodiments, catalytic combustion type or semiconductor type can be used. In particular, the gas sensor group 3 can be configured by selecting a plurality of gas sensors with high detection sensitivity for the plurality of gas components to be detected, and the gas concentration can be calculated and processed by a microcomputer. There are various possibilities. However, if gas sensors with measurement methods based on the same principle are used in combination, only one scum sensor amplifier 6 is required, so it is desirable to combine gas sensors with measurement methods based on the same principle.

When using a gas sensor of a measurement method based on the same principle, the following configuration of the gas sensor group 3 can be considered.

(1) When using gas sensors made of the same material.

Even if the material constituting the gas sensor is the same, the detection sensitivity for each gas changes depending on the heater voltage of the gas sensor, so a gas sensor group 3 is constructed having a heater voltage that allows the gas component targeted for detection to be detected with high sensitivity.

(2) When using gas sensors with different compositions.

Since the detection sensitivity for each gas will be completely different if the materials that make up the gas sensor are different, gas sensors that can detect the target gas component with high sensitivity are selected and combined to form the gas sensor group 3. .

(3) By combining the above (1) and (2), a gas sensor group 3 is constructed which can detect the gas component for detection with high sensitivity.

〔Effect of the invention〕

As described above, the present invention detects a plurality of gas components using a plurality of gas sensors, so that a plurality of gas components can be detected using a plurality of gas sensors.
It is possible to obtain a gas-in-oil detection device for oil-filled equipment that is capable of detecting a gas component in a short time, and is capable of detecting a plurality of gas components in a short time.

[Brief explanation of the drawing]

Fig. 1 is a gas detection system diagram of one embodiment of the gas-in-oil detection device for oil-filled equipment of the present invention, and Fig. 2 is a gas detection system diagram of another embodiment of the gas-in-oil detection device for oil-filled equipment of the present invention. System diagram, FIG. 3 is a vertical sectional side view of the gas detection section of FIG. 2, and FIG. 4 is a gas detection system diagram of still another embodiment of the gas-in-oil detection device for oil-immersed equipment of the present invention. . DESCRIPTION OF SYMBOLS 1... Gas permeable material, 2... Gas reservoir part, 3... Gas sensor group, 4... Gas detection part, 5... Measurement part, 6
... Gas sensor amplifier, 7... Arithmetic device, 8...
- Display device, 10... Insulating oil, 15... Gas reservoir chamber, 16... Diaphragm pump, 17... Carrier gas pipe, 20a. 20b...6-way switching valve, 21a, '2lb
... Calibration tube, 1st counterfeit 2 illusion ~

Claims (1)

[Claims] 1. A method for separating a plurality of gas components dissolved in the insulating oil in the oil-filled equipment using a gas permeable material, and detecting the separated gas components in the oil of the oil-filled equipment. In the gas detection device, the gas-in-oil detection device includes a gas reservoir portion for storing the plurality of gas components separated by the gas permeable material, and a gas reservoir portion connected to the gas reservoir portion and inside the gas reservoir portion. a gas detection section including a plurality of gas sensors that respectively detect the plurality of gas components; and respective outputs from the plurality of gas sensors connected to the gas detection section and measuring the plurality of gas components; a t1 measurement section that calculates and displays the plurality of gas components from the values and respective detection characteristic values for each of the gas components alone for each of the gas sensors, which have been measured and stored in advance by the gas detection section; An oil-filled gas-in-oil detection device characterized by comprising: 2.'+)'lJ measuring section, which measures output values from each of the plurality of gas sensors and the above-mentioned data for each of the gas sensors. a gas sensor amplifier that amplifies each detection characteristic value for each gas component alone; a calculation device that is connected to the gas sensor amplifier and processes the plurality of gas components from the output value and the detection characteristic value; A gas-in-oil detection device for oil-immersed equipment according to claim 1, comprising a display device for displaying calculation results of the calculation device.