JPH02285257A - Gas analyser - Google Patents

Abstract

PURPOSE:To obtain an analytical result within a short time by easily analyzing extracted gas at every single component by mounting the first and second separation means, the first and second detection means and a display and recording means. CONSTITUTION:A sample solution is separated into a liquid and gas in the first separation means, that is, a gas separator. The separated gas is sent to the first detection means, that is, a non-combustible gas detector to detect and separate a non-combustible gaseous component herein. Continuously, the gas enters the second separation means, that is, a mixed component separator to be separated into single components and is successively sent to the second detection means, that is, a combustible gas detector. The combustible gas detector detects the successively sent single components. The signals generated from both of the non-combustible gas detector and the combustible gas detector are sent to a display and recording means, that is, a detector output recording apparatus to be displayed and recorded. By this constitution, in performing the internal diagnosis of the insulating oil of a transformer, the analysis of the gas dissolved in the insulating oil can be easily performed at every single component by a series of continuous operations.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an analyzer for gas dissolved in insulating oil of oil-filled electrical equipment, and is particularly useful for analyzing gas components when diagnosing the inside of insulating oil of transformers. The present invention relates to a gas analyzer suitable for detecting.

(Prior Art) Regarding the internal diagnosis of a transformer, there is a means of analyzing the components of gas contained in the insulating oil of an oil-immersed transformer and diagnosing the transformer from the details of the deterioration of the insulating oil. For this purpose, insulating oil is collected from the transformer, dissolved gases in the oil are extracted using a deaerator using mercury in an analysis room, and gas analysis is performed. Gas chromatography is widely known as a gas analysis method.
Although it has a reputation for analytical accuracy, it is complex and requires skill to operate, as it uses mercury to extract gas from insulating oil, requires a high-pressure cylinder for inert gas, and requires large equipment.

No. 7 @ (A) is a conventional gas-in-oil extraction device, the same figure (B)
1 is a diagram schematically showing the structure of a gas chromatograph. As shown in FIG. 7(A), the insulating oil 2 is introduced from the sample container 15 into the gas-in-oil extraction container 1, and the pressure inside the gas-in-oil extraction container 1 is reduced using the water level movement in the mercury container 17. The gas dissolved in the insulating oil 2 is separated, and the separated gas is passed through the gas sampling pipe cock 18 to the gas inlet 19 shown in FIG.
guided by. 22 is a helium gas cylinder, and 12 is a flow control valve. The flow rate of the helium gas is adjusted by the flow rate control valve 12, passes through the flow path switching valve 3, enters the gas separation device 6, and then enters the combustible gas detection device! 7 and the circuit leading to the carbon dioxide gas detection device 5, and stabilizes each of these devices.

The gas separation bag @6 is heated to a constant temperature by a gas separation device temperature controller 9. The pressure in the calibration tube 4 is reduced by the vacuum pump 20, the cock of the gas sampling tube 18 is opened, and the gas inside is transferred to the calibration tube 4. The gas in the calibration tube 4 flows from the flow control valve 12 by operating the flow path switching valve 3. The gas is sent to the gas separation device 6 together with the helium gas. The fed gas becomes a single component due to the gas distribution effect due to gas adsorption and desorption by porous particles in the gas separation device 6, and sequentially enters the combustible gas detection device 7 and the carbon dioxide detection device 5, forming a voltage change curve according to the gas concentration. recorded as. The area surrounded by the recorder's baseline and the voltage change curve is measured and used as a calculation element to determine the gas concentration.

Recently, in order to stabilize power receiving and substation equipment and distribution equipment, early detection and countermeasures for AM abnormalities have become necessary, and there has been an increasing demand for internal diagnosis of oil-immersed transformers in a short time. The technology disclosed in Japanese Patent Publication No. 126591 was invented to meet the above-mentioned needs, and the technology extracts the gas present in the insulating oil by blowing gas, and removes the flammable gas contained in the extracted gas. It detects the mixed components as they are.

(Problems to be Solved by the Invention) The above-mentioned conventional technology requires that the extracted gas be analyzed for each single component in order to carry out diagnosis. For example, when the concentration of methane gas and acetylene gas accounts for the majority of the total, It is assumed that the insulating oil deteriorates due to overheating, and if hydrogen and acetylene gas are detected, it is thought that an electrical discharge occurred in the insulating oil and there is a risk of structural destruction of the electrical equipment. Furthermore, if carbon dioxide gas is detected in the methane gas and ethylene gas, it is assumed that the insulating paper has deteriorated due to overheating. Despite the high necessity of detecting carbon dioxide gas,
The No. 591 invention cannot detect carbon dioxide gas, nor does it take into account the detection of acetylene gas, which is an important combustible gas, and is therefore insufficient as a gas analyzer for internal diagnosis of oil-immersed transformers. Met. Therefore, it would be desirable to develop a small and simple gas analyzer that has analysis accuracy comparable to the gas chromatograph. The object of the present invention is to provide a small and simple gas analyzer that can easily perform analysis for each single component, and can obtain analysis results in a short time without requiring any skill in handling.

(Means for Solving the Problems) The above objects include a first separation means for circulating air blown into a liquid and separating gas from the liquid; and a first separation means for separating gas from the liquid. a first detection means for detecting nonflammable gas; a second separation means for separating the combustible gas in the gas separated by the first separation means into a single component; The device is configured to carry out continuous processing, including a second detection means for detecting the combustible gas separated into its components, and a display and recording means for displaying and recording the outputs of the first detection means and the second detection means. This can be achieved using a gas analyzer.

(Function) With the above configuration, the device for extracting the gas dissolved in the insulating oil separates the gas from the insulating oil by blowing air into the insulating oil in a circulation manner.
The gases are mixed and concentrated in the blown air. To detect carbon dioxide contained in the extracted gas, use a device that selectively detects carbon dioxide in the air, such as a non-separable infrared carbon dioxide detector. It detects carbon dioxide gas in the extracted gas by absorbing it and measures its concentration. A device for separating a combustible gas mixture contained in extracted gas into single components involves bringing the gas into contact with particles that have a porous surface that has the function of adsorbing and desorbing gas, for example, and By exploiting the effect of gas distribution caused by gas components, they are separated into single components. A device for detecting a single component combustible gas uses, for example, a thermal linear semiconductor combustible gas detector. This is because when a gas is brought into contact with one side of a bridge circuit made of a filament made of a sintered semiconductor, the electrical resistance of the semiconductor changes, causing the bridge circuit to become unbalanced.The resulting change in electrical resistance is used to detect the gas and its concentration. Know. By arranging these devices in a series circuit, the operation is continuous and sequential analytical operations are performed. In addition to air, helium, argon, and nitrogen can be used as the gas blown into the insulating oil.

(Example) An example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a gas analyzer according to the present invention. The sample liquid is separated into liquid and gas in the first separation means, that is, the gas separation device, and the separated gas is sent to the first detection means, that is, the nonflammable gas detection device, where the nonflammable gas components are detected. Detected and separated. The gas then enters a second separation means, a mixed component separator, where it is separated into single components and is sequentially sent to a second detection means, a combustible gas detection device. The combustible gas detection device detects single components that are delivered sequentially. The signals generated by the non-flammable gas detection device and the combustible gas detection device are sent to a display/recording means, that is, a detection device output/recording device, where they are displayed and recorded.

Next, the functions of this embodiment will be explained in detail with reference to the apparatus configuration diagram shown in FIG. The 14A edge oil 2 in the sample container 15 is transferred to the gas-in-oil extraction container 1 through the sampling valve 16, and the air whose flow rate is adjusted by the air flow control valve 14 is blown into the gas-in-oil extraction container 1 through the air supply pump 13. The air blown into the insulating oil 2 passes through the insulating oil 2, reaches the oil surface, and is sent to the analysis circuit through the operation of the flow path switching valve 3. Figure 3 (
A) and (B) show switching states within the flow path switching valve 3. In the state shown in Figure (A), air flows through the calibration tube 4 to the air supply pump 1.
Returned to 3. The returned air is sent to the gas-in-oil extractor 1 again. By repeatedly passing through this circulation circuit, the gas dissolved in the insulating oil 2 is diffused into the air and accumulated in the circulation circuit. The first separation means for separating gas from a liquid according to the present invention is, for example, the sample container 15 in FIG. Gas-in-oil extraction vessel 1. sample collection valve 16, air supply pump 13,
This refers to a control system that includes the air flow control valve 14 and the flow path switching valve 3.

The extracted gas thus accumulated in the circulation circuit is sent to a pre-stabilized gas analysis circuit. That is,
By switching the flow path switching valve 3 to the state shown in FIG. 3 CB) and guiding the air sent from the carrier air supply pump 8 to the calibration tube 4, the extraction gas in the calibration tube 4 is transferred to the first For example, in this embodiment, the detection means sends the extracted gas to the carbon dioxide gas detection device 5 to detect carbon dioxide contained in the extracted gas.

FIG. 4 is a diagram showing the internal structure of the carbon dioxide gas detection device 15.
Infrared rays emitted from the infrared light source 24 are transmitted to the infrared receiver 2.
When the extraction gas is introduced from the sample gas inlet 25 into the container configured to reach 6.

If carbon dioxide gas is present in the extracted gas, the amount of extracted gas decreases due to the absorption of infrared rays, so that carbon dioxide gas can be detected and measured. Since this effect is also expressed in the air, it is possible to selectively detect carbon dioxide gas in the air. The extracted gas that has passed through the carbon dioxide detection device 5 is discharged from the sample gas discharge port 28. Next, the extracted gas enters a second separation means, for example, the combustible gas separator 6 of this embodiment, which separates the mixed components into single components, and sequentially sends them to the combustible gas detector 7, which is a second detection means. It will be done. Fifth
The figure shows the internal structure of the combustible gas separation device 6, which consists of a container filled with porous particles, such as metal particles, that have a gas adsorption/desorption function.

In this example, three types of porous particles are used: a first porous particle filling tube 29, a second porous particle filling tube 30, a third porous particle filling tube 31, and a switching valve 32 for switching these circuits. It has the following. While the extracted gas sent to the combustible gas separation device 6 passes through the first porous particle-filled tube 29, it is divided into two groups due to the distribution effect caused by the gas adsorption of the particles. One is a group that passes with the air flow, and the other is a group that is adsorbed by the particles in the first porous particle-filled tube 29. The group that has passed through the first porous particle filling group 29 enters the second porous particle filling tube 30 and also passes through the second porous particle filling tube 30 . During this flow, the switching valve 32 is operated so as to form a circuit that flows from the second porous particle filling tube 30 to the third porous particle filling tube 31. As a result, the group that has passed through the second porous particle filling tube 3o enters the third porous particle filling tube 31. Each gas constituting the group entering the third porous particle-filled tube 31 is separated into single components due to the distribution effect due to gas adsorption of the internal particles, and sequentially flows out depending on the difference in desorption time from one particle.

On the other hand, each gas constituting the group adsorbed in the first porous particle-filled tube 29 is separated into single components due to the distribution effect due to adsorption and desorption in the @1 porous particle-filled tube 29, and the desorption time from the particles is reduced. Depending on the difference, the particles pass through the first porous particle filling tube 29 in order, but at this stage, there is not enough separation to distinguish each component, but the particles enter the next second porous particle filling tube 3o. Due to the separation effect caused by adsorption and desorption of internal particles, each component is separated more clearly than in the first porous particle-filled tube 29, and flows out one after another due to the difference in desorption time.

The single component gas that sequentially flows out from the third porous particle-filled tube 31 is sent to the next combustible gas detection device 7 and detected there. Since the number of components flowing out from the third porous particle filling tube 31 and the time at which the outflow ends are known, when this time has elapsed, the switching valve 32 is operated, and the combustible components are directly discharged from the second porous particle filling tube 30. A circuit leading to the gas detection device 7 is formed. As a result, the components sequentially flowing out from the second porous particle-filled tube 30 can be transferred to the combustible gas detection device W1 without passing through the third porous particle-filled tube 31.
7, where it is detected. FIG. 6 is a diagram showing the configuration of the detection element of the combustible gas detection device 7. The detection element consists of a resistor bridge circuit composed of a filament made of sintered semiconductor, and resistors 35a and 35b on two sides of the circuit
The detection element cell 34 is arranged so that the sample gas comes into contact with the sample gas.

The components sequentially sent from the combustible gas separation table a6 enter the detection element cell 34 through the combustible gas inlet 33. The electrical conductivity of the detection resistors 35a and 35b changes when they come into contact with the detection gas, and the balanced state of the resistance bridge circuit is disrupted, causing a change in the voltage between the terminals 37. The electric signals generated by the carbon dioxide gas detection device 5 and the electric signals generated by the combustible gas detection device 7 are sent to the display/recording means, that is, the detection device output recording device 10 of this embodiment, each time they occur, and the values indicated by the signals are recorded. Display and record. By going through the above process, the gas components and amounts dissolved in the sample 2 can be measured by a series of continuous operations.

In the present invention, the first detection means is, for example, the carbon dioxide gas detection device 5, the second separation means is, for example, the combustible gas separation device 6, and the second detection means is, for example, the combustible gas detection device 7. correspond to each other, carrier air pump 8, power supply device 111. It also includes a control system including the degree adjuster 9 and other peripheral devices, and the means for displaying and recording analysis results includes the detection device output recording device 1o and its control system.

(Effects of the Invention) By carrying out the present invention, when diagnosing the inside of the insulating oil of a transformer, the analysis of gas dissolved in the insulating oil can be easily performed for each single component in a series of continuous operations, and it is easy to handle. It is possible to provide a small and simple gas analyzer that does not require any skill to operate and can obtain analysis results in a short time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the gas analyzer according to the present invention, FIG. 2 is a device configuration diagram showing the functions of this embodiment,
FIGS. 3(A) and 3(B) are explanatory views of the flow path formation of the flow path switching valve;
Fig. 4 is a diagram showing the internal structure of the carbon dioxide gas detection device, Fig. 5 is a diagram showing the internal structure of the flammable gas separation device, Fig. 6 is a configuration diagram of the detection element of the combustible gas detection device, and Fig. 7 (A) is a diagram schematically showing the structure of a gas-in-oil extraction device, and (B) is a diagram schematically showing the structure of a gas chromatograph. 1... Gas in oil extraction container 2... Insulating oil 3... Flow path switching valve 4... Calibration tube S... Carbon dioxide gas detection device 6... Flammable gas separation device 7... Combustible gas detection device 8... Carrier air supply pump 9... Temperature controller 10... Detection device output recording device 11... Power supply device 12.14... Flow rate control valve 13... Supply Air pump 15...Sample oil container 1
6... Sample collection valve 24... Infrared light source 25...
・Sample gas inlet 26...Infrared receiver 28...
Sample gas outlet 29.30.31...Porous particle filling tube 32.
・Flow path switching valve 34...detection element cell 35a, 3
5b...detection resistor

Claims (1)

[Claims] 1. A first separation means for separating gas from a liquid;
a first detection means for detecting nonflammable gas from the gas separated by the separation means; and a second separation means for separating the combustible gas in the gas separated by the first separation means into single components. , comprising a second detection means for detecting the combustible gas separated into single components by the second separation means, and a display recording means for displaying and recording the outputs of the first detection means and the second detection means. A gas analyzer characterized by continuous processing.