JPH02112744A - Method and device for detecting dissolved gas in insulating oil - Google Patents

Abstract

PURPOSE:To execute bubbling until the quantity of detected gaseous carbonic acid is relaxed and to always execute the extraction of dissolved gas in insulating oil under a prescribed condition by detecting the quantity of gaseous carbonic acid in the insulating oil by a carbonic acid gas detector provided in a circulating path of the insulating oil of an electric equipment, and executing the bubbling, while detecting gaseous carbonic acid. CONSTITUTION:At the time of detecting dissolved gas in insulating oil, valves 5, 13, 14, 16 and 17 are closed, a hexagonal switching cock 11 is switched to a path shown with a full line, and valves 4, 9 and 12 are opened. In this state, a pump 3 is operated and while allowing gas G1 which does not inculde a component for hindering the detection for gaseous carbonic acid, hydrocarbon and moisture, etc., to flow, the purging of a sample oil storing container 1, a gas holder container 7, an oil mist eliminating filter 8, a gaseous carbonic acid detector 10 and the inside of each piping is executed. At the time of this purging, the detector 10 is operated, and when the detection level of gaseous carbonic acid becomes zero, purging is ended, and in this case, a gas circulating path becomes a state that it is filled with gas which does not include gaseous carbonic acid nor moisture.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dissolved gas detection method and apparatus for detecting dissolved gas components in insulating oil of oil-filled electrical equipment such as transformers.

[Prior art] When an abnormality occurs that causes heat generation in the insulating oil of oil-filled electrical equipment such as a transformer, the thermal decomposition of the insulating material causes hydrogen gas H2, hydrocarbon gas CH4°C2H2, C2H14
,02)46,C3H6,...-carbon oxide gas Co1, carbon dioxide gas COz, etc. are generated and these are dissolved in the insulating oil. The composition of the dissolved gas varies depending on the degree of overheating of the electrical equipment.

Therefore, by detecting dissolved gas in the insulating oil and examining its components, it is performed to diagnose whether there is any abnormality in each electric Va.

In order to detect dissolved gas in the insulating oil of oil-filled electrical equipment, it is necessary to extract the dissolved gas in the insulating oil. One method for this is to blow air into the insulating oil. By bubbling inside (creating air bubbles),
There is a method of extracting dissolved gases from the injected air.

When extracting dissolved gas using this method, a sample oil storage container is used to store the insulating oil extracted from the tank of the electrical equipment as a sample oil, and a sample oil storage container is used to perform bubbling in the sample oil. A pump for supplying air is provided to form a gas circulation path from the pump through the sample oil storage container and back to the pump. By operating the pump for a certain period of time, bubbling is caused in the insulating oil in the sample oil storage container.

There is a method of using a gas chromatograph to analyze in detail the components of the extracted dissolved gas, but this method inevitably requires a complicated device and requires a considerable amount of time for analysis.

Therefore, without using a large-scale gas chromatograph,
BACKGROUND ART The presence or absence of an abnormality in an electric generator is detected by detecting only hydrocarbon gas or only hydrogen gas in dissolved gas.

[Problems to be Solved by the Invention] Ideally, the extraction of dissolved gas should be carried out until the dissolved gas in the insulating oil and the extracted gas are in equilibrium within the gas circulation path during bubbling. In reality, it is difficult to bring all the dissolved gases into such an equilibrium state through bubbling up to 116. Therefore, in the conventional dissolved gas detection method, dissolved gas was extracted by continuing bubbling for a certain period of time. Since the amount of dissolved gas that is extracted varies, it is not possible to keep the extraction conditions for dissolved gas constant just by keeping the bubbling time constant, which may result in situations where the specific gas that should be extracted is not extracted properly. There was a risk of errors in device diagnosis.

Furthermore, conventional methods detect only hydrocarbon gas or hydrogen gas, which makes it possible to detect abnormalities in electrical equipment.
It was not possible to detect the extent of equipment deterioration.

The object of the present invention is to provide a method and method for detecting dissolved gas in insulating oil, which allows extraction of dissolved gas to be carried out under constant conditions, and which also makes it possible to measure the degree of deterioration of electrical equipment. The goal is to provide equipment.

[Means for Solving the Problems] The present invention provides a sample oil storage container for storing insulating oil extracted from the tank of oil-filled electrical equipment as sample oil, and a sample oil storage container for bubbling in the sample oil. A gas circulation path from the pump through the sample oil storage container and back to the pump is provided, and the gas in the sample oil is bubbled in the insulating oil in the sample oil storage container. The present invention relates to a method of extracting dissolved gas and detecting components of the dissolved gas.

In the method of the present invention, a carbon dioxide gas detector that irradiates the supplied gas with infrared rays and detects carbon dioxide in the gas from the absorption of the infrared rays is inserted in the middle of the gas circulation path. Then, bubbling is performed while detecting the amount of carbon dioxide gas in the gas circulating in the gas circulation path using this carbon dioxide gas detector, and bubbling is performed until the amount of carbon dioxide gas detected by at least six carbon dioxide gas detectors is saturated. have them do it.

If the gas chamber in the carbon dioxide detector has sufficient volume,
After bubbling is stopped, calibration can be performed by guiding the gas in the carbon dioxide gas detector to a hydrocarbon detector or a hydrogen detector.

- The detection device that implements the above method consists of a sample oil storage container that stores insulating oil extracted from the tank of oil-filled electrical equipment as sample oil, and a sample oil storage container that stores the insulating oil extracted from the tank of oil-filled electrical equipment as sample oil. A pump that supplies gas, a carbon dioxide gas detector that irradiates the supplied gas with infrared rays and detects the presence of carbon dioxide in the gas based on the amount of infrared rays absorbed, and a carbon dioxide gas detector that detects the presence of carbon dioxide in the gas in the gas storage container. a hydrocarbon detector for detecting;
It can be constructed by connecting means for connecting these in any order so as to form a gas circulation path from the pump through the sample oil storage container, the gas reservoir, and the mM gas detector and back to the pump.

If the volume of the gas chamber in the carbon dioxide gas detector is small and the amount of gas in the gas chamber is insufficient to detect hydrocarbons or hydrogen, a gas reservoir is provided in the middle of the gas circulation path, The gas in this gas reservoir is guided to a hydrocarbon detector or a hydrogen detector to calibrate the hydrocarbon or hydrogen.

Furthermore, two gas reservoir containers are installed in the gas circulation path,
By guiding the gas in one gas reservoir to the hydrogen detector and the gas in the other gas reservoir to the hydrocarbon detector, both hydrogen and hydrocarbons can be detected.

Further, by disposing electrodes for measuring the dielectric tangent and volume resistivity of the insulating oil in the sample oil storage container, the dielectric tangent and volume resistivity of the insulating oil can also be measured.

Furthermore, a lower sample oil container provided with an electrode for measuring dielectric breakdown voltage is provided below the sample oil storage container, so that the sample oil in the sample oil storage container can be transferred into the lower sample oil container through the piping. By keeping it in place, the dielectric breakdown voltage of the insulating oil can also be measured.

[Function] In oil-filled electrical equipment, even if there is no abnormality that causes overheating, when the electrical appliance is in operation, carbon dioxide gas is released from the insulating oil or the insulation of the equipment due to the heat generated by the equipment. It is known that this carbon dioxide gas is dissolved into the insulating oil.

Therefore, a certain amount of carbon dioxide gas is always dissolved in the insulating oil of electrical equipment that has been operated. Furthermore, since the level of carbon dioxide gas reflects the time during which the electrical equipment generates heat, the degree of deterioration of the equipment can be determined by detecting the level of carbon dioxide gas.

In view of this point, the present invention provides a carbon dioxide gas detector in the middle of the gas circulation path for bubbling, and uses this detector to detect the presence of carbon dioxide in the gas extracted by bubbling.

F in gas extracted by bubbling as in the present invention
When the amount of acid gas A is detected, the detected amount of carbon dioxide gas M increases as the extraction of dissolved gas progresses, and as the extraction of dissolved gas approaches the end, the detected amount of carbon dioxide gas becomes saturated. When this detected amount is saturated, there is an equilibrium between the carbon dioxide gas present in the gas space in the gas circulation path and the carbon dioxide gas dissolved in the insulating oil, and bubbling will not continue any longer. However, no further carbon dioxide gas is extracted. Therefore, the extraction of carbon dioxide gas is completed when the detected amount of carbon dioxide gas is saturated. Furthermore, by using the point at which carbon dioxide gas extraction is completed as a guideline for determining the time to stop bubbling, the extraction conditions can be kept almost constant for other dissolved gases as well. At least when the detected amount of carbon dioxide gas is saturated, the extraction of gases that have a faster extraction rate than carbon dioxide gas has been completed, so by detecting hydrocarbons and/or hydrogen from the gas extracted in this way, electricity can be generated. Device diagnosis can always be performed accurately under constant conditions.

In the present invention, a detector that detects the amount of carbon dioxide gas based on the amount of infrared rays absorbed by carbon dioxide gas is used as a carbon dioxide gas detector, so even if carbon dioxide gas is calibrated, there is no effect on the components in the extracted gas. . Therefore, the gas used to detect carbon dioxide gas can be directly guided to a hydrocarbon detector or a hydrogen detector for hydrocarbon or hydrogen calibration.

Since some dissolved gases have a slower extraction rate than carbon dioxide gas, it is preferable to continue bubbling for a certain period of time even after the detected amount of carbon dioxide gas is saturated.

Furthermore, the amount of carbon dioxide detected from the extracted dissolved gas reflects the heat generation temperature of the device and the length of time that the heat was generated, so when detecting the drop in carbon dioxide as described above,
The degree of deterioration of the insulation of electrical equipment can be determined from the level of carbon dioxide gas.

[Example] The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 schematically shows the configuration of the detection neck used in the first embodiment of the present invention. The oil storage container 3 is a pump, and a gas discharge port of the pump 3 is connected to a pipe 1a connected to the lower part of the sample oil storage container 1 via a valve 4. The pipe 1a connected to the lower part of the sample oil storage container 1 is also connected to a sample oil discharge pipe 6 via a valve 5. A plate having a large number of pores is disposed at the opening of the tube 1a connected to the lower part of the sample oil storage container 1 into the container 1, and gas is introduced into the sample oil in the container 1 through the tube 1a. When supplied, the gas becomes fine particles (bubbles) and rises in the sample oil.

One end of the exhaust pipe [b] is connected to the upper part of the sample oil storage container 1, and the other end of this exhaust pipe 1b is connected to the lower inlet a of the gas reservoir container 7.
It is connected to the. The lower outlet b of the gas reservoir 7 is connected to the inlet of a carbon dioxide detector 10 via an oil mist removal filter 8 and a valve 9, and the outlet of the carbon dioxide detector 10 is connected to a boat P1 of a six-way switching cock 11. has been done. [Hexagonal switching] The boat P2 of the pump 11 is connected to the gas suction port of the pump 3, and the boat P3 is connected via the valve 12 to a gas supply source that supplies gas G1 obtained by removing carbon dioxide and moisture from air. . The boat P4 of the six-way switching cock 11 is opened to the outside air via the valve 13, and the boat P5 is opened to the air G2 via the valve 14.
source (pump or cylinder). In addition, the boat P6 of the six-way switching cock 11 has a hydrocarbon detector 1.
It is connected to the sample gas inlet of 5.

The upper part of the gas storage container 7 is connected to a tank of oil-filled electrical equipment through a valve 16, and an air supply source is connected through a valve 17 to the middle of an exhaust pipe 1b connected to the upper part of the sample oil storage container 1. .

The hexagonal switching cock 11 can be switched between a bus indicated by a solid line and a bus indicated by a broken line by operating a handle (not shown).

In this embodiment, the hexagonal switching cock 11 is set to the path shown by the broken line in the figure, and when the valves 4 and 9 are opened, the pump 3→valve 4→sample oil storage container 1→gas reservoir container 7→filter 8
→ Valve 9 → Carbon dioxide gas detector 10 → Six-way switching switch 11
→The gas circulation path for pump 3 is now configured. In this example, a hexagonal switching cock 11, a pump 3, a sample oil storage container 1. The gas reservoir container 7, the filter 8, and the piping that interconnects the carbon dioxide detector 10 constitute a connection means that connects and covers each part so as to form the gas circulation path.

In this embodiment, a well-known flame ionization detector 29 (FID) is used as the hydrocarbon detector 15. This detector has a sample gas intake 15a and an air intake 1.
5b and a hydrogen gas intake port 15C, inside which is a nozzle for spouting a mixed gas of sample gas and hydrogen gas, a passage for supplying air to the tip of the nozzle, and a collector electrode facing the nozzle. and is provided.

When a hydrocarbon gas is calibrated, a sample gas is taken in from the sample gas intake port i5a, hydrogen is mixed with the sample gas, and the mixed gas is ejected from the nozzle. Further, air taken in from the air intake port 15b is supplied around the nozzle, and the nozzle is ignited to create a hydrogen flame. Then, a voltage is applied between the nozzle and the collector electrode, and the amount of hydrocarbons is measured based on the magnitude of the current flowing from the nozzle through the collector electrode. When hydrocarbon gas is included in the sample gas, a larger current flows between the nozzle and the collector electrode than when it is not included. The mass of hydrocarbon gas can be measured based on the magnitude of this current.

Further, as the carbon dioxide gas detector 10, one that detects the presence of carbon dioxide gas by measuring the amount of infrared rays absorbed by carbon dioxide gas is used. Such a carbon dioxide gas detector is, for example,
A sample gas storage chamber that contains a sample gas, a reference gas chamber that contains 13 gases that do not contain carbon dioxide, a light source that alternately irradiates infrared rays of a specific wavelength through both gas chambers, and the amount of infrared rays that passes through both gas chambers. and a detector that detects the difference between the two.

When detecting dissolved gas in insulating oil using the above device, first close valves 5.13, 14.16 and 17,
Switch the hexagonal switching cock 11 to the solid line path shown in the figure.

In this state, valves 4.9 and 12 are opened, and pump 3 is operated to flow gas G1, which does not contain components that would interfere with detection of carbon dioxide, hydrocarbons, moisture, etc., into sample oil storage container 1 and gas reservoir. Purging the inside of the container 7, A illumist removal filter 8, carbon dioxide gas detector 10, and each pipe. During this purging, the carbon dioxide gas detector 10 is set to "C",
Purging ends when the detected level of carbon dioxide gas reaches zero. At this time, the gas circulation path is filled with gas that does not contain carbon dioxide or water.

When purging is completed, pump 3 is stopped and valves 12 and 4 are closed. Open the valve 16 to allow insulating oil to flow in. The insulating oil passes through the gas reservoir container 7 and accumulates in the sample oil storage container 1. The valve 16 is closed at an appropriate point to leave a predetermined amount of sample oil in the sample oil storage container 1.

Next, the valves 4 and 9 are opened with the six-way switching cock 11 set to the path shown by the broken line in the figure, and the pump 3 is operated to circulate the gas within the gas circulation path. This causes bubbling in the sample oil in the sample oil storage container 1, and the gas dissolved in the sample oil 2 is extracted. While this bubbling is being performed, the valve 14 is operated to supply air to the hydrocarbon detector 15, and also to supply hydrogen directly to the hydrocarbon detector 15, thereby putting the detector 15 into operation.

As bubbling progresses, dissolved gas is extracted from the gas flowing through the gas circulation path, and the concentration of dissolved gas in the circulating gas increases. Since dissolved gas always contains carbon dioxide gas, the number of detection methods for carbon dioxide gas by the carbon dioxide gas detector 10 increases. As the extraction of dissolved gas approaches its end, the carbon dioxide detection formula becomes saturated. When the detected amount of carbon dioxide reaches saturation, the detected value is measured and used as data for determining the degree of deterioration of electrical equipment. After the detected amount of carbon dioxide gas is saturated, bubbling is continued for a certain period of time,
Perform extraction of dissolved gas.

Even when the detected amount of carbon dioxide gas is saturated, not all of the carbon dioxide gas dissolved in the sample oil has been extracted, and a certain amount of carbon dioxide gas remains in the sample oil in equilibrium. The amount of carbon dioxide remaining in the sample oil is determined by the Bunsen coefficient of carbon dioxide dissolving in the insulating oil (when the insulating oil and gas space are in contact with each other in an equilibrium state, the amount of carbon dioxide gas dissolved in the medium volume of the insulating oil is The ratio of the river of carbon dioxide contained in a gas space to the volume of carbon dioxide contained in a unit volume of gas space is expressed as a volume ratio of carbon dioxide.

), it can be determined from the volume of the gas space in the gas circulation path and the volume occupied by the sample oil.

After a certain period of time has elapsed after the detected amount of carbon dioxide gas has saturated, the pump 3 is stopped to end bubbling.

In the present invention, a detector that detects the amount of carbon dioxide gas by the amount of infrared rays absorbed by carbon dioxide gas is used as a carbon dioxide gas detector, so even if carbon dioxide gas is calibrated, there is no effect on the components in the extracted gas. . Therefore, by guiding the gas in the gas reservoir 7 and the carbon dioxide detector 10 to the hydrocarbon detector 15 after bubbling is completed, the hydrocarbon components in the dissolved gas can be accurately measured.

When performing this hydrocarbon calibration, the valve 17 is opened and the valve 4 is closed, and the six-way switching cock 11 is set to the path shown by the solid line in the figure. Air (of course, containing neither hydrocarbons nor hydrogen) is gradually supplied from below into the gas reservoir 7 through the valve 17, thereby pushing up the gas in the gas reservoir 7 and guiding it to the hydrocarbon detector 15.

After the measurement of the amount of hydrocarbons in the extracted gas is completed, the valve 5
, drain the sample oil in the sample oil storage container 1, and return the device to its initial state.

FIG. 2 shows the configuration of a dissolved gas detection device used in a second embodiment of the present invention. In this example, the gas reservoir volume VSI
A gas reservoir container 7- is provided outside the gas reservoir container 7.
The inlet of - is connected to the oil mist removal filter 8 via a valve 9', and the outlet of the gas reservoir 7- is connected to the inlet of a carbon dioxide detector 10.

Further, a boat P1 of a four-way switching cock 22 is connected to the outlet of the oil mist removal filter 8 via a valve 21, and a boat P2 of the switching cock 22 is connected to a hydrogen detector 23. As the hydrogen detector 23, a semiconductor sensor, a fuel cell, or the like can be used. The boat P3 of the four-way switching cock 22 is connected to the air supply line (this may be ordinary air) via the valve 24, and the boat P4 is connected to the air supply line via the valve 24.
5 is becoming popular and open to the public.

The four-way switching cock 22 can be switched between a path shown by a solid line and a path shown by a broken line.

In other respects, the structure is similar to that of the embodiment shown in FIG.

In this example, when the switching cock 11 is switched to the path indicated by the broken line, the pump 3→valve 4→sample oil storage container 1
A bubbling gas circulation path is constructed as follows: -> gas reservoir 7 -> filter 8 -> valve 9'-> gas reservoir 7 - -> carbon dioxide gas detector 10 -> switching cock 11 -> pump 3.

When calibrating dissolved gas using this detection device, the detection system is first purged, but in this case, the six-way switching cock 11 and the four-way switching cock 22 are switched to the path shown by the solid line, and the valve 5.13. 14.17.16.2
Close 4 and 25.

In this state, open valves 4, 9- and 12, and pump 3
By operating the bubbling gas circulation path, a purging gas that does not contain carbon dioxide is passed through the bubbling gas circulation path to purge this gas circulation path, and at the same time, gas is also supplied to the hydrogen detector 23 side through the valve 21 and the switching cock 22. The hydrogen detector 23 side is also purged by flushing. The manner in which purging is completed is the same as in the embodiment shown in FIG.

When purging is completed, pump 3 is stopped and valves 12 and 4 are closed. Open the valve 16 to allow insulating oil to flow in. The insulating oil passes through the gas reservoir container 7 and accumulates in the sample oil storage container 1. The valve 16 is closed at an appropriate point to leave a predetermined amount of sample oil in the sample oil storage container 1. The hexagonal switch 11 is switched to the path shown by the broken line, valves 4 and 9' are opened, and valve 21 is closed. In this state, the pump 3 is operated to circulate the gas within the gas circulation path. This causes the sample oil to bubble within the sample oil storage container 1, and the gas dissolved in the sample oil 2 is extracted. Also, while this bubbling is being performed, the valve 14 is opened to supply air and hydrogen to the hydrocarbon detector 15, thereby putting the detector 15 into operation. Further, the switching cock 22 is switched to the path indicated by the broken line in the figure, and the hydrogen detector 23 is brought into operation by supplying air to the hydrogen detector 23 by listening to the valve 24.

The procedure for ending bubbling is the same as in the previous embodiment.

After stopping the pump 3 and ending bubbling, the valve 9- is closed, the valve 17 is opened, and the switching cock 22 is switched to the path shown by the solid line. In this state, air is allowed to flow into the gas reservoir 7 from below through the valve 17. This pushes up the gas in the gas reservoir 7 and supplies it to the hydrogen detector 23 through the oil mist removal filter 8, the valve 21s, and the switching cock 22, and the hydrogen R in the dissolved gas is detected by the detector.

After the detection of the amount of hydrogen is completed, the valve 21 is closed, the valve 9' is turned on, and the switching cock 11 is switched to the path indicated by the solid arrow shown in the figure. In this state, air is supplied through the valve 17 to transfer the gas in the gas reservoir 7 to the hydrocarbon detector 15. After the detection of hydrocarbons is completed, the valve 5 is opened to discharge the sample oil in the sample oil storage container 1, and the system returns to the initial state.

FIG. 3 shows a detection device used in yet another embodiment of the present invention. In this example, the sample oil storage container 1 is made of a transparent container, and the dielectric tangent and volume resistivity are measured inside the container 1. An electrode 30 for measuring dielectric tangent and volume resistivity, which forms part of a measurement system, is arranged. The measuring electrodes 30 are cylindrical electrodes 30a and 30 that are insulated from each other and arranged concentrically.
It consists of b. These electrodes are connected to a test power supply (not shown), and a DC voltage is applied between the electrodes 30a and 30b when measuring the volume resistivity of the sample oil, and when measuring the dielectric tangent of the sample oil. An alternating current voltage is applied between 30a and 30b.

Reference numeral 31 denotes a hue comparison board used to determine the color of the sample oil in the container 1, and this comparison board is placed near the container 1 when testing the hue of the insulating oil.

In this embodiment, a valve 5 is also provided at the bottom of the sample oil storage container 1.
A transparent lower sample oil container 32 is connected through the valve 5', and the lower part of the lower sample oil container 32 is connected to an oil drain pipe through a valve 5'. Inside the lower sample oil container 31 are a pair of spherical ef! 33a, 3
3b is stored. These electrodes 33a, 33b are connected to a test power source (not shown), and an AC test voltage is applied between both electrodes to measure the dielectric breakdown voltage of the sample oil.

In this embodiment, the sample oil storage space of the sample oil storage container 1 is set to be more than twice the sample oil storage space of the lower sample oil container 32.

Further, in this embodiment, a combustible gas detector based on a thermal linear semiconductor type, which is simpler in structure and cheaper than the hydrogen flame ionization detection 3 (FID), is used as the hydrocarbon detector 15'. This detector utilizes the fact that the electrical conductivity of the semiconductor changes when the gas to be detected is adsorbed to an element made by coating a platinum wire coil with a metal oxide semiconductor and firing it. Hydrocarbon gas can be calibrated at the same time.

In other respects, it is similar to the detection device shown in FIG.

The gas circulation path in this embodiment is similar to that of the detection device shown in FIG. Valve 5 when purging
．． 5', 13, 14, 16, and 17 m, and switch the hexagonal switching cock 11 to the path shown by the solid line. In this state, valves 4, 9 and 12 are opened and pump 3 is operated to perform purging.

The procedure for completing this purging is the same as in the embodiment shown in FIG.

After storing the sample oil in the sample oil storage container 1, the valves 4 and 9 are opened with the hexagonal switching cock 11 set to the path shown by the broken line in the figure, and the pump 3 is operated to perform bubbling.

While this bubbling is being performed, the valve 14 is opened to supply air to the hydrocarbon detector (in this example, a combustible gas detection tube) 15-, thereby putting the detector into operation.

The method of ending bubbling is the same as in the embodiment shown in FIG. After bubbling is completed, the valve 17 is opened to supply air, thereby transferring the gas in the gas reservoir 7 to the hydrocarbon detector 15', and measuring the amount of hydrocarbon gas in the extracted dissolved gas.

After hydrocarbon detection is completed and LC is completed, valves 17 and 9 are closed, valve 5 is turned on to transfer the sample oil in the sample oil storage container 1 into the lower sample oil container 32, and then valve 5' is opened to transfer the sample oil into the lower sample oil container 32. to be discharged. As a result, the inside of the sample oil storage container 1 and the inside of the lower sample oil container 32 are cleaned. If necessary, the interior of containers 1 and 32 is further cleaned by introducing insulating oil via valve 16.

After this cleaning is completed, close valve 5.5' and close valve 1.
6 and take a predetermined amount of sample oil into the sample oil storage container SI. After closing the valve 16, it remains stationary for a while. The test method specified in JISC2101 stipulates that the dielectric tangent and volume resistivity of the insulating oil be measured at an oil temperature of 80°C, so the temperature of the sample oil is then raised to an upper limit of 80°C using a heater (not shown). let By maintaining this temperature and applying a DC voltage and an AC voltage between the measurement electrodes 30a and 30b, the volume resistivity and dielectric tangent of the sample oil are measured.

After completing these measurements, finish adjusting the temperature of the sample oil,
Keep it stationary and let the oil temperature return to room temperature.

When determining the color of the insulating oil, prepare a hue comparison plate 31 and compare the hue of the sample oil in the transparent sample oil storage container 1 with the hue on the hue comparison plate 31 to determine whether the cJ is the same as the sample oil. Select a hue comparison board. In this case, it is necessary to manufacture the hue comparison plate 31 so as to obtain the same orientation result as the orientation result according to J15K2580.

After determining the hue of the insulating oil, the valve 5 is opened to transfer the sample oil in the sample oil storage container 1 into the lower sample oil container 32. When the lower sample oil container 32 is almost full of insulating oil, it is left standing for a while. After that, the spherical electrode 33a
, 33b to perform a dielectric breakdown test on the sample oil. This test is conducted according to JTSC2101.

JIS2101 requires that the oil temperature be 15 to 35°C, and a total of 5 measurements are taken at 1 minute intervals for each sample, and then 1
It is specified that a total of 10 pieces of data can be obtained by changing the samples and performing the same measurement.

Therefore, after five dielectric breakdown tests are completed for the sample oil in the lower sample oil container 32, the valve 5 is closed, and the valve 5-
Open and drain the sample oil.

Thereafter, close the valve 5-, open the valve 5, transfer a certain amount of sample oil into the lower sample oil container 32 again, keep it stationary for a certain period of time in the same way as above, and then conduct the dielectric breakdown test five times. . These operations are repeated to obtain data for 10 samples.

After all measurements are completed, valves 5 and 5- are opened to drain all sample oil.

Note that the principle is similar to that of the carbon dioxide gas detector described above (however, the wavelength of the infrared rays used is different). ), a detector for measuring the concentration of -carbon oxide is known. In the above embodiment, this carbon monoxide detector may be incorporated in series with the carbon dioxide gas detector 10. It is generally known that in oil-filled electrical equipment, the amount of carbon monoxide generated increases when a high temperature condition that leads to deterioration of the equipment occurs. Therefore, as a result of detecting carbon monoxide as described above, if the amount of dissolved carbon monoxide is large, it can be known that a high temperature condition that may lead to deterioration of the equipment has occurred.

In each of the above embodiments, the insulating oil was introduced from the top of the gas reservoir container 7 to obtain the sample oil, but the insulating oil was introduced from the top of the sample oil storage container 1 to obtain the sample oil. Good too.

In each of the above embodiments, the oil mist removal filter 8 is provided on the outlet side of the gas reservoir container 7, but if the sample oil is collected from the upper part of the sample oil storage container 1, An oil mist removal filter may be inserted between the gas reservoir container 1 and the gas reservoir container 7. Note that if oil mist is not a problem, the oil mist removal filter can be omitted.

In the above embodiments, the arrangement order of the components of the gas circulation path can be changed as appropriate. For example, in the embodiments of FIGS. 1 and 3, the positions of the gas reservoir 7 and the carbon dioxide detector 10 can be interchanged. In the embodiment shown in FIG. 3, the gas reservoir 7- and the carbon dioxide detector 1
0 can be exchanged, or the carbon dioxide gas detector 10 can be placed between the gas reservoir container 7 and the sample oil storage container 7.

In each of the above embodiments, a gas reservoir is particularly provided, but if the carbon dioxide detector 10 has a sufficient volume of empty gas, the gas reservoir may be omitted.

[Effects of the Invention] As described above, according to the present invention, gas circulation for bubbling is developed by focusing on the fact that carbon dioxide gas is always dissolved in the insulating oil of electrical equipment that has been operated. A carbon dioxide gas detector is installed in the middle of the route, and this detector detects the level of carbon dioxide in the extracted gas while bubbling is performed, and when the detected amount of carbon dioxide is saturated, the bubbling is stopped. Since the amount of gas dissolved in the insulating oil is determined, the amount of dissolved gas in the insulating oil can be always extracted under substantially constant conditions. Therefore, by detecting hydrocarbons and/or hydrogen in the gas extracted in this way, electric equipment can be diagnosed more accurately.

In addition, in the present invention, since a detector that does not involve a chemical reaction is used as a carbon dioxide gas detector, which detects the field of carbon dioxide gas from an infrared absorption device, the extracted gas used for detecting carbon dioxide gas is directly transferred to the hydrocarbon detector and ( Alternatively, by directing the hydrogen to a hydrogen detector, it is possible to accurately measure hydrocarbons and/or hydrogen and diagnose the condition of electrical equipment.

In addition, the r of carbon dioxide gas detected from the extracted dissolved gas reflects the heat generation temperature of the equipment and the length of time during which heat generation occurred, so as in the present invention, the carbon dioxide gas dissolved in the insulating oil By detecting the hanging of the carbon dioxide gas, it is possible to judge the degree of deterioration of the insulation of the electrical equipment from the carbon dioxide gas.

[Brief explanation of drawings]

1 to 3 are schematic configuration diagrams showing the configuration of a detection device used in different embodiments of the present invention. 1... Sample oil storage container, 2... Sample oil, 3... Pump, 4.5.5=, 9.9', 13, 16.17...
・Valve, 7.7'... Gas reservoir container, 10... Carbon dioxide gas detector, 11... Six-way switching cock, 22...
Four-way switching cock, 23...Hydrogen detector. Figure 1

Claims (9)

[Claims] (1) A sample oil storage container that stores insulating oil extracted from the tank of oil-filled electrical equipment as sample oil, and a pump that supplies gas into the sample oil storage container to cause bubbling in the sample oil. to form a gas circulation path from the pump through the sample oil storage container and back to the pump, and extract the dissolved gas in the sample oil by bubbling in the insulating oil in the sample oil storage container. In the method for detecting the components of the dissolved gas, a carbon dioxide gas detector that irradiates the supplied gas with infrared rays and detects the amount of carbon dioxide in the gas from the amount of absorbed infrared rays is provided in the middle of the gas circulation path. and bubbling is performed while the amount of carbon dioxide gas in the gas circulating through the gas circulation path is detected by the carbon dioxide gas detector, at least until the amount of carbon dioxide gas detected by the carbon dioxide gas detector is saturated. A method for detecting dissolved gas in insulating oil, characterized by performing bubbling. (2) A sample oil storage container that stores insulating oil extracted from the tank of oil-filled electrical equipment as sample oil, and a pump that supplies gas into the sample oil storage container to cause bubbling in the sample oil. to form a gas circulation path from the pump through the sample oil storage container and back to the pump, and extract the dissolved gas in the sample oil by bubbling in the insulating oil in the sample oil storage container. In the method for detecting the components of the dissolved gas, a carbon dioxide gas detector that irradiates the supplied gas with infrared rays and detects the amount of carbon dioxide in the gas from the amount of absorbed infrared rays is provided in the middle of the gas circulation path. and bubbling is performed while the amount of carbon dioxide gas in the gas circulating through the gas circulation path is detected by the carbon dioxide gas detector, at least until the amount of carbon dioxide gas detected by the carbon dioxide gas detector is saturated. A method for detecting dissolved gas in insulating oil, characterized in that bubbling is performed, and then the gas in the carbon dioxide gas detector is guided to a hydrocarbon detector or a hydrogen detector to detect hydrocarbons or hydrogen. (3) A sample oil storage container that stores insulating oil extracted from the tank of oil-filled electrical equipment as sample oil, and a pump that supplies gas into the sample oil storage container to cause bubbling in the sample oil. to form a gas circulation path from the pump through the sample oil storage container and back to the pump, and extract the dissolved gas in the sample oil by bubbling in the insulating oil in the sample oil storage container, In the method for detecting the components of the dissolved gas, a gas storage container and a carbon dioxide gas detector that irradiates the supplied gas with infrared rays and detects the amount of carbon dioxide in the gas from the amount of absorbed infrared rays are connected to the gas reservoir. It is inserted in the middle of the circulation path, and performs bubbling while detecting the amount of carbon dioxide gas in the gas circulating through the gas circulation path with the carbon dioxide gas detector, and at least detects the amount of carbon dioxide gas detected by the carbon dioxide gas detector. Dissolved gas in insulating oil, characterized in that bubbling is performed until the amount is saturated, and then the gas in the gas reservoir is guided into a hydrocarbon detector or a hydrogen detector to detect hydrocarbons or hydrogen. Detection method. (4) A sample oil storage container that stores insulating oil extracted from the tank of oil-filled electrical equipment as sample oil, and a pump that supplies gas into the sample oil storage container to cause bubbling in the sample oil. to form a gas circulation path from the pump through the sample oil storage container and back to the pump, and extract the dissolved gas in the sample oil by bubbling in the insulating oil in the sample oil storage container, The method for detecting components of dissolved gas includes two gas storage containers and a carbon dioxide gas detector that irradiates the supplied gas with infrared rays and detects the amount of carbon dioxide in the gas from the amount of absorbed infrared rays. Inserted in series in the middle of the gas circulation path, bubbling is performed while the amount of carbon dioxide gas in the gas circulating in the gas circulation path is detected by the carbon dioxide gas detector, and detected by at least the carbon dioxide gas detector. Bubbling is performed until the detected amount of carbon dioxide gas is saturated, then the gas in one gas reservoir is led into a hydrogen detector to detect hydrogen, and the gas in the other gas reservoir is carbonized. A method for detecting dissolved gas in insulating oil, characterized by detecting hydrocarbons by guiding the gas to a hydrogen detector. (5) A sample oil storage container that stores insulating oil extracted from the tank of oil-filled electrical equipment as sample oil, and a pump that supplies gas into the sample oil storage container to cause bubbling in the sample oil. , a carbon dioxide gas detector that detects the amount of carbon dioxide in the gas by irradiating infrared rays onto the supplied gas and detecting the amount of carbon dioxide in the gas from the amount of absorbed infrared rays; and a hydrocarbon detector that detects hydrocarbons in the gas in the gas storage container. and a connecting means for connecting these in any order so as to form a gas circulation path from the pump to the sample oil storage container and the carbon dioxide gas detector and back to the pump. Dissolved gas detection device inside. (6) A sample oil storage container that stores insulating oil extracted from the tank of oil-filled electrical equipment as sample oil, and a pump that supplies gas into the sample oil storage container to cause bubbling in the sample oil. , a gas reservoir; a carbon dioxide gas detector that irradiates the supplied gas with infrared rays and detects the amount of carbon dioxide in the gas from the absorption of the infrared rays; and hydrogen or carbonization in the gas in the gas reservoir. a gas detector for detecting hydrogen; and a connecting means for connecting these in an arbitrary order so as to form a gas circulation path from the pump to the pump via a sample oil storage container, a gas reservoir, and a carbon dioxide gas detector. A device for detecting dissolved gas in insulating oil, characterized by comprising: (7) A sample oil storage container that stores insulating oil extracted from the tank of oil-filled electrical equipment as sample oil, and a pump that supplies gas into the sample oil storage container to cause bubbling in the sample oil. , two gas reservoir containers, an inter-gas reservoir opening/closing valve that opens and closes between the two gas reservoir containers, and irradiating the supplied gas with infrared rays to determine the amount of carbon dioxide in the gas from the amount of infrared rays absorbed. a hydrogen detector that detects hydrogen in the gas in one gas storage container; a hydrocarbon detector that detects hydrocarbons in the gas in the other gas storage container; and the pump. It is characterized by comprising a connecting means for connecting these in an arbitrary order so as to form a gas circulation path from the sample oil storage container, two gas reservoir containers, a valve, and a carbon dioxide gas detector to the pump. Dissolved gas detection device in insulating oil. (8) The insulating oil according to any one of claims 5 to 7, wherein an electrode for measuring the dielectric tangent and volume resistivity of the insulating oil is arranged in the sample oil storage container. Dissolved gas detection device. (9) A lower sample oil container provided with an electrode for measuring dielectric breakdown voltage is provided below the sample oil storage container, and the sample oil in the sample oil storage container is transferred into the lower sample oil container through piping. Claim 5 characterized in that:
9. The device for detecting dissolved gas in insulating oil according to any one of items 8 to 8.