JPH06331515A - Gas-in-oil analyzer - Google Patents

Abstract

PURPOSE:To remarkably improve the analyzing efficiency and to also improve the analyzing accuracy. CONSTITUTION:Since a degassing unit 19 and a calibration tube 4 are evacuated in vacuum, dissolved gas in the unit 19 is extracted by utilizing the pressure difference between the unit 19 and an oil thief bin 2 and extracted gas is fed to the tube 4 by utilizing the pressure difference between the unit 9 and the tube 4, the gas can be rapidly extracted from insulation oil 1, and the extracted gas which is not diluted is sent to a separator 5 to be separated to gases each consisting of a single ingredient. Since the gases are detected by corresponding sensors 8, 7, 6, the separating accuracy of the separator 5 can be sufficiently good, and the detecting accuracy of the gas consisting of a single ingredient can be sufficiently obtained. As a result, analysis having a high accuracy can be effectively executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an analyzer for gas components mixed in insulating oil of oil-filled electrical equipment, and more particularly to an analyzer suitable for diagnosing deterioration of an oil-filled transformer. Is.

[0002]

2. Description of the Related Art The first conventional technique for analyzing gas mixed in oil is discussed in the Technical Report of the Institute of Electrical Engineers of Japan (The Institute of Electrical Engineers of Japan (2) No. 344). That is, the related art is that after collecting insulating oil from an oil-filled electrical device, various gas extraction methods (Tricheri method,
Dissolved gas in oil is extracted by the Tepler pump method, etc., and the dissolved gas in oil is passed through a gas separation device in a gas chromatograph to separate the mixed gas into single component gases for analysis. Has been done. A second conventional technique is disclosed in Japanese Patent Application Laid-Open No. 54-126591. That is, in the second conventional technique, the gas mixed in the insulating oil is extracted by blowing the gas, and the flammable gas contained in the extracted gas is detected as the mixed component. . Further, as a third conventional technique, there is a technique shown in FIGS. That is, in the prior art shown in FIGS. 4 and 5, the oil collecting bottle 2 containing the insulating oil 1 is closed by the bubbling head 3, and air is sent to the oil collecting bottle 2 by the blower pump 11 to extract gas, The gas is sent to the calibration tube 4 via the flow path switching valve 13. Then, when the flow path switching valve 13 is switched, water is removed in advance by the water vapor removal filter 10 and air as carrier air is sent to the calibration tube 4 via the flow path switching valve 13 to cause the inside of the calibration tube 4 to change. The gas passes through the carbon dioxide detector 7 through a predetermined passage of the flow path switching valve 13. At that time, carbon dioxide is detected by passing through the carbon dioxide detector 7, and a part of the gas passing through the detector 7 is separated into individual component gases by passing through the gas separation device 5, Only the combustible gas is detected by passing the separated gas through the combustible gas detector 8, and thereafter, based on the separated gas and the remaining gas that has passed through the carbon dioxide detector 7, an arithmetic unit 9
It is configured to analyze various gases for each single component by performing arithmetic processing by. Note that FIG. 5 shows output waveforms of the carbon dioxide detector 7 and the combustible gas detector 8. Further, in the conventional technology shown in FIGS. 6 and 7, after the gas in the calibration tube 4 passes through the carbon dioxide detector 7 through the direction switching valve 13, the carbon monoxide detector 6 removes carbon monoxide. After being detected, the combustible gas is detected by passing through the combustible gas detector 8 via the pump 11 ′, and the detected gas is analyzed by the arithmetic unit 9. Note that FIG. 7 shows output waveforms of the carbon dioxide detector 7, the carbon monoxide detector 6, and the combustible gas detector 8, respectively.

[0003]

By the way, the prior art described above does not consider the following points. That is,
In the first conventional technique, dissolved gas is extracted from insulating oil by various gas extraction methods, and the extracted gas is separated into a single component gas, so that the gas extraction device and the separation device are separate devices. Therefore, not only is the operation of each device complicated, but there is also the problem that it takes too much time for the final analysis. In addition, in such a device that takes too much time, if the number of oil-filled electrical devices subject to analysis and survey is large, the number of surveys within a certain period of time will be limited, so it is not suitable for actual work. Is the current situation. The second conventional technique does not detect the gas for each single component gas, but detects only the combustible gas in a mixed state, so that the concentration of the single component gas is particularly measured. There is an unsatisfactory problem in diagnosing deterioration of vessels. In the third conventional technique, a gas extraction unit consisting of an oil collecting bottle 2, a calibration tube 4 and a pump 11 and a gas of a corresponding type are detected from the extracted gas for analysis, and a carbon dioxide detector 7, Separator 5 or carbon monoxide detector 6,
Since the pump 11 ', the combustible gas detector 8, and the analysis unit including the arithmetic unit are integrally configured, the gas extraction and analysis can be performed only by installing the collected insulating oil in the extraction unit. Although it is possible and less troublesome than the first conventional technique, it is difficult to further reduce the time. That is, in the third conventional technology, for example, when the insulating oil from the first oil-filled transformer to be analyzed is analyzed and then the insulating oil from the next oil-filled transformer is analyzed, Before that, in both the one shown in FIG. 4 and the one shown in FIG. 6, it is necessary to completely remove the gas in the previous analysis condition between the extraction section and the analysis section. It has to be cleaned, which is a difficult task. As a result, when there are many oil-filled electrical devices,
Although the number of processed units is higher than that of the first conventional technique, there is a problem that good processing efficiency cannot be obtained within a fixed time.

In view of the above problems of the prior art, an object of the present invention is to provide a practical and highly reliable analyzer for gas in oil, which can greatly improve the analysis work efficiency and the analysis accuracy. To do.

[0005]

In the analyzer for gas in oil of the present invention, an extraction having a degassing section for extracting dissolved gas from insulating oil in an oil collecting bottle and a calibration tube for taking in the extracted gas in the degassing section A mechanism, a separation unit that separates the extracted gas from the calibration tube for each single component, and a detector that detects each single component gas separated by the separation unit by type,
And a calculation unit that analyzes the concentration of gas for each single component based on the detection of each detector, the extraction mechanism evacuates between the calibration tube and the degassing unit, and the pressure in the degassing unit. There is a vacuum means that causes the dissolved gas in the insulating oil to be extracted into the degassing section by the difference between the pressure inside the oil collection bottle and the extraction gas into the calibration tube due to the difference between the pressure inside the degassing section and the pressure inside the calibration tube. is doing.

[0006]

In the present invention, as described above, the vacuum means is evacuated between the calibration tube and the degassing section and the pressure difference between the degassing section of the extraction mechanism and the oil collecting bottle is utilized to dissolve the dissolved gas in the degassing section. Since the extracted gas is sent to the calibration tube by utilizing the pressure difference between the degassing section and the calibration tube, the dissolved gas can be quickly extracted from the insulating oil. Further, since the extraction gas from the degassing section is sent to the evacuated calibration tube, there is no fear that the extraction gas will be diluted by the air in the calibration tube, and the undiluted extraction gas is sent to the separation section. Separated into single component gases,
Since the single component gas is detected by each corresponding detector, not only the separation accuracy of the separation unit can be sufficiently secured, but also the detection accuracy of the single component gas can be sufficiently secured.
Highly accurate analysis can be reliably performed. Furthermore, after the analysis of one sample is completed, the extraction mechanism is cleaned by vacuuming with the vacuum means to analyze the next sample, so not only the cleaning time can be shortened, but also the cleaning work is simple and easy. Becomes Therefore, the analysis processing time is greatly shortened and the analysis accuracy is improved, so that a practical and highly reliable analysis device can be provided, and particularly when the number of oil-filled electrical devices is large, a more remarkable effect can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3, the same parts as those in FIGS. 4 to 7 are designated by the same reference numerals. The analyzer of the example is
When roughly classified, it is provided with an extraction mechanism for extracting a dissolved gas from the insulating oil 1 as a sample, and a separation / analysis mechanism for separating the extracted gas into a single component and detecting the gas of the single component. Has been done.

More specifically, the extraction mechanism has a degassing section 19 and a calibration tube 4 connected to the degassing section 19 via a switching cock 18. The degassing section 19 is for extracting a dissolved gas from the insulating oil 1 as a sample in the oil collecting bottle 2, and is connected to the oil collecting bottle 2 arranged below the oil collecting bottle 2 via a switching cock 15. A stirrer 17 for stirring the inside is incorporated, and a heating means (not shown) for heating the inside is provided. Further, a pressure gauge 16 for measuring the internal pressure is attached to the upper part of the degassing part 19, and the gas outlet side of the upper part is connected to the intake side 4a of the calibration tube 4 via a switching cock 18. On the other hand, the calibration tube 4 includes the intake side 4a and the feed side 4
As shown in FIG. 1, b is connected to one side of the flow path switching valve 13, and the intermediate position of the intake side 4a is the deaerator 19 as described above.
It is connected to the gas outlet side of. The flow path switching valve 13 is constituted by a six-way valve in this example, and is switched as shown in FIG. 1 when the dissolved gas is extracted, and as shown in FIG. 2 when the extracted gas is separated and analyzed. The extraction mechanism causes the degassing section 19 to extract the dissolved gas from the insulating oil 1,
Further, it has a vacuuming means for sending the extracted gas into the calibration tube 4. The evacuation means is a vacuum pump 20 connected to an intermediate position on the feeding side 4b of the calibration tube 4,
It has the switching cock 18 installed in the pipe between the intake side 4a of the calibration pipe 4 and the degassing unit 19, and the switching cock 15 installed in the pipe between the degassing unit 19 and the oil collecting bottle 2. When extracting the dissolved gas, the vacuum pump 20 has a degassing section by drawing a vacuum when the flow path switching valve 13 is in the switching state shown in FIG. 1 and the switching cock 18 is open and the switching cock 15 is closed. 19 and the inside of the calibration tube 4 are decompressed to a predetermined gauge pressure (-760 mmHg). Then, when the deaeration unit 19 and the inside of the calibration tube 4 are evacuated, when the switching cock 18 is closed and the switching cock 15 is opened, the pressure in the oil collecting bottle 2 and the deaeration unit 1
The insulating oil in the oil collecting bottle 2 is sucked into the degassing section 19 due to the difference in pressure from the inside of the oil collecting bottle 2, and the dissolved gas is extracted from the sucked insulating oil into the upper part of the degassing section 19. Further, in this case, when the gas is extracted into the degassing section 19, the degassing section 1
In 9 the pressure is higher (> -760 mmHg) than the initial gauge pressure after being evacuated, that is, it is higher than the pressure in the calibration tube 4, so in that state the switching cock 1
When 5 is closed and the switching cock 18 is opened, the degassing unit 1
The extracted gas in 9 is sent out to the calibration tube 4 via the switching valve 18 and the intake side 4a. The vacuum pump 20 discharges the vacuumed air to the atmosphere.

The separation / analysis mechanism has a separation unit 5, respective detectors, and a calculation unit 9. The separation part 5 has porous particles inside, and when the extraction gas in the calibration tube 4 is supplied, it is separated into a single component gas by the adsorption / desorption action of the porous particles. Each of the detectors detects a combustible gas passing therethrough by burning, and a combustible gas detector 8 of a catalytic combustion type or a thermal linear semiconductor type, and carbon dioxide for detecting carbon dioxide by an infrared absorption action. It comprises a detector 7 and a carbon monoxide detector 6 for detecting carbon monoxide by conducting a constant potential electrolysis, and these detectors 8, 7, 6 are sequentially provided on the outlet side of the separation section 5. The calculation unit 9 includes the detectors 6 to 8 respectively.
The concentration of each gas is calculated for each single component by performing calculation based on the detection signal from. Further, in the separation / analysis mechanism, normally, when the flow path switching valve 13 is switched as shown in FIG. 1, only the air from the pump 11 is supplied, so that the separation unit 5 and the respective detectors 8 are provided. , 7,6 functions are stabilized. That is, pump 1
The air from 1 stabilizes the functions of the separation unit 5 and the respective detectors by being normally sent toward the separation unit 5, and when the extraction gas is sent into the calibration tube 4,
When the flow path switching valve 13 is switched as shown in FIG. 2 to be sent to the intake side 4a, it functions as carrier air for sending the extracted gas in the calibration tube 4 toward the separation section 5. A water vapor removal filter 10 is provided on the suction side of the pump 11 to remove moisture from the air sucked from the atmosphere. Further, the isolating unit 5 as the separating / analyzing mechanism and a pipe having each of the detectors 6 to 8 are housed in a constant temperature bath 21. The constant temperature bath 21
In particular, when the temperature around the combustible gas detector 8 is low, it is difficult for the detector 8 to function well. Therefore, by keeping the inside at a predetermined temperature, the combustible gas detector 8 is kept. It is configured so that the detection function of can be favorably maintained. Therefore, although not shown, the constant temperature bath 21 is provided with heating means for maintaining a predetermined temperature.

The analyzing apparatus of the embodiment has the above-mentioned structure. Next, the operation will be described. First, when extracting the dissolved gas, the flow path switching valve 13 is switched to the state as shown in FIG. 1 and the pump 11 is operated, whereby air serving as carrier air is pumped from the outside air through the water vapor removal filter 10 to the pump 1
1, the sucked air is sent into the constant temperature tank 21 through the flow path switching valve 13, and the inside of the constant temperature tank 21 is maintained at a predetermined temperature, whereby the combustible gas 8 and the carbon dioxide detector are detected. 7. Confirm that each of the carbon monoxide detectors 6 is in a stable state. After that, the oil collecting bottle 2 in which a fixed amount of insulating oil 1 to be analyzed is collected in advance is set at a position below the degassing section 19, and then the switching cock 15
Is closed, the switching cock 18 is opened, and the vacuum pump 20 is driven.
A vacuum is drawn between 9 to reduce the gauge pressure (-760 mmHg). Then, after evacuating to a gauge pressure, the switching cock 18 is closed and the switching cock 15 is opened. Due to the difference between the pressure in the deaeration unit 19 and the pressure in the oil collecting bottle 2, insulation in the oil collecting bottle 2 is insulated. The oil 1 is sucked into the degassing part 19 through the switching cock 15, and the dissolved gas in the insulating oil 1 is extracted. At this time, the insulating oil 1 sucked in the deaerator 19 is stirred by the stirrer 17, and
Since the inside is heated by a heating means (not shown),
More dissolved gas can be extracted. Degassing section 1
When the dissolved gas is extracted in 9, the switching cock 18 is opened, and when the switching cock 15 is closed, the dissolved gas in the degassing section 19 is removed due to the difference between the pressure in the degassing section 19 and the pressure in the calibration tube 4. It is sucked into the calibration tube 4 via the intake side 4a. This is because the pressure inside the degassing section 19 when the dissolved gas is extracted becomes a pressure (> -760 mmHg) higher than the initial gauge pressure after being evacuated, and the pressure and the gauge pressure in the calibration tube 4 are This is because the dissolved gas is sucked into the calibration tube 4 due to the difference. Thereafter, when the flow path switching valve 13 is switched as shown in FIG. 2, the pump 11 is switched by the flow path switching valve 13.
Is connected to the intake side 4a of the calibration tube 4, the feed side 4b of the calibration tube 4 is connected to the separation section 5 in the thermostat 21, and air as carrier air is stored in the calibration tube 4. The extraction gas is sent to the separation unit 5. In the constant temperature bath 21, when the extraction gas passes through the separation unit 5, the extraction gas is separated into the single component gas by the separation unit 5,
By sequentially passing through the combustible gas detector 8, the carbon dioxide detector 7, and the carbon monoxide detector 6, the corresponding type of gas is detected. On the other hand, when the detectors 8, 7, and 6 detect the corresponding types of gas, the calculation unit 9 calculates the concentration of the detected gas by calculating based on the respective output signals as shown in FIG. You will be asked. In FIG. 3, the waveform of the combustible gas detector 8 is output with a delay as compared with the detectors 6 and 7 for carbon monoxide and carbon dioxide, respectively. This is because the detection time differs depending on the characteristics. The gas that has passed through the constant temperature bath 21 is released to the atmosphere. When the analysis of the insulating oil which is one sample is completed in this way, the inside of the pipe is washed to analyze the next sample. In that case, in the constant temperature bath 21, the flow path switching valve 13 is changed over as shown in FIG. 1, and the air from the pump 11 is passed through the constant temperature bath 21 to make the constant temperature bath 21.
Purify. In the deaeration unit 19, after the insulating oil 1 is emptied by collecting it in the oil collecting bottle 2 or a waste oil tank (not shown), the switching cock 15 is closed and the switching cock 18 is opened, and the vacuum pump in that state. By vacuuming at 20, the space between the degassing section 19 and the calibration tube 4 is cleaned, and at that time, the gauge pressure is reduced to prepare for the next sample.

As described above, in this embodiment, the deaeration unit 19 and the calibration tube 4 are evacuated in advance, and the deaeration is performed by utilizing the pressure difference between the deaeration unit 19 and the oil collecting bottle 2. The dissolved gas is extracted into the portion 19, and the extracted gas is sent to the calibration tube 4 by utilizing the pressure difference between the inside of the degassing portion 19 and the inside of the calibration tube 4, so that the dissolved gas can be quickly supplied from the insulating oil 1. Can be extracted. As a result, in the third conventional technique of extracting by the air bubbling method, 15
Although it took a minute to extract, in the present embodiment, it takes about 1 minute, and the extraction can be performed extremely quickly. Further, as described above, since the extraction gas from the degassing section 19 is sent to the evacuated calibration tube 4, there is no fear that the extraction gas will be diluted by the air in the calibration tube 4, and it is not diluted. The extracted gas is sent to the separation unit 5 to be separated into a single component gas, and the single component gas is detected by the corresponding detectors 8, 7, and 6, so that the separation accuracy of the separation unit 5 is sufficient. Not only can it be ensured, but also the detection accuracy of the gas of the single component can be sufficiently ensured, so that highly accurate analysis can be reliably performed. Furthermore, after the analysis of one sample is completed, in order to analyze the next sample, the space between the degassing section 19 and the calibration tube 4 is cleaned by vacuuming with the vacuum pump 20, so that the cleaning time can be shortened. Also, the cleaning work is simple and easy. Therefore, the gas extraction / analysis and the cleaning time in the pipe required 45 minutes for each sample in the prior art shown in FIGS.
Since it only takes minutes, the efficiency of analysis work in a certain period of time can be greatly improved. Furthermore, in the illustrated embodiment,
The degassing section 19 has a stirrer 17 and heating means, and the insulating oil 1
Since the gas is stirred and heated, the degassing action of the dissolved gas in the insulating oil 1 can be further promoted. In contrast to the degassing efficiency of about 60% in the third conventional technique,
% Can be increased. Further, the separation section 5 and the pipes having the respective detectors 8, 7, and 6 are housed in the constant temperature bath 21, and the temperature is kept in the constant temperature bath 21, so that the combustible gas detector 8 is made to function particularly well. Therefore, the higher detection accuracy can be maintained, and there is no fear that the detection function becomes unstable due to changes in the ambient temperature. Further, at the time of evacuation, extraction of dissolved gas, and transportation of the extracted gas to the separation unit 5, the operation of the vacuum pump 20 and the flow path switching valve 1 are performed.
The example in which the switching of No. 3 and the switching cocks 15 and 18 are manually opened and closed has been shown, but if a control means capable of automatically operating them is provided, it becomes possible to analyze automatically, and automation of analysis is achieved. obtain. Further, according to the present device, since the extracted gas can be separated and analyzed with high accuracy, the specific gas that serves as a determination index when performing the degradation diagnosis of dissolved gas in oil described in Vol. It is possible to accurately diagnose the abnormal part of the oil-filled electrical device from the occurrence of the gas, the gas pattern, and the composition ratio, and it is possible to detect the abnormal part early and prevent accidents.

[0012]

As described above, according to the present invention, the dissolved gas is extracted into the degassing section by utilizing the pressure difference between the degassing section and the oil collecting bottle of the extraction mechanism which have been evacuated in advance. Moreover, since the extracted gas is sent to the calibration tube by utilizing the pressure difference between the inside of the degassing section and the inside of the calibration tube, the dissolved gas can be quickly extracted from the insulating oil and the undiluted extracted gas is sent to the separation section. Is separated into a single component gas, and each gas is detected by the corresponding detector, so highly accurate analysis can be reliably performed, and the extraction mechanism is further reduced by vacuuming. Since the cleaning is performed, not only the cleaning time can be shortened, but also the cleaning work is simple and easy. Therefore, the analysis processing time can be greatly shortened and the analysis accuracy can be improved to provide a practical and highly reliable analyzer. There are especially If the number of filled electrical equipment often have more remarkable effect.

[Brief description of drawings]

FIG. 1 is an explanatory piping diagram showing an embodiment of a gas extraction method of an analyzer for gas in oil according to the present invention.

FIG. 2 is a piping diagram for explaining the same when analyzing the extracted gas.

FIG. 3 is an output waveform diagram showing a detection state of each detector.

FIG. 4 is a piping diagram showing a configuration example of a conventional technique.

FIG. 5 is an output waveform diagram showing a detection state of each detector in FIG.

FIG. 6 is a piping diagram showing another configuration example of the conventional technique.

FIG. 7 is an output waveform diagram showing a detection state of each detector in FIG.

[Explanation of symbols]

1 ... Insulating oil, 2 ... Oil collecting bottle, 19 ... Deaeration part, 4 ... Calibration tube, 5 ... Separation part, 6 ... Carbon monoxide detector, 7 ... Carbon dioxide detector, 8 ... Combustible gas detector, 9 ... Calculation unit, 15,
18 ... Switching cock, 20 ... Vacuum pump, 21 ... Constant temperature bath.

(72) Inventor Yoshihiko Kaneko 46-1, Tomioka, Nakajo-machi, Kitakanbara-gun, Niigata Prefecture Nakajo Factory, Hitachi, Ltd. (72) Takashi Kiryu 46-1 Tomioka, Nakajo-machi, Kitakanbara-gun, Niigata Prefecture Hitachi, Ltd. Nakajo Plant (72) Inventor Tsukasa Yoneyama 2-4-1 Nishitsujigaoka, Chofu-shi, Tokyo Tokyo Electric Power Company Technical Research Laboratory (72) Inventor Koichi Murata 2-4-1 Nishiazajigaoka, Chofu-shi, Tokyo Electric Power Co., Ltd.

Claims (1)

[Claims] 1. A degassing section for extracting dissolved gas from insulating oil in an oil collecting bottle, an extraction mechanism having a calibration tube for taking in the extraction gas in the degassing section, and the extraction gas from the calibration tube for each single component. Separation unit that separates into two parts, each detector that detects the gas of each single component separated by the separation unit, and a calculation that analyzes the gas concentration of each single component based on the detection of each detector And a vacuum is drawn between the calibration tube and the degassing section, and the dissolved gas in the insulating oil is degassed in the degassing section by the difference between the pressure in the degassing section and the pressure in the oil collecting bottle. An apparatus for analyzing gas in oil, comprising vacuum means for extracting and extracting the extracted gas into the calibration tube by the difference between the pressure inside the degassing section and the pressure inside the calibration tube.