JPH0972892A - Abnormality diagnosis method inside oil-filled electrical equipment - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To extract and analyze high boiling point, trace amount, and various kinds of decomposition products of an insulating material effective for diagnosing internal abnormality in an oil-filled electrical device, and to analyze the inside of the oil-filled electrical device Get a way to diagnose abnormalities. SOLUTION: A sample oil 5 is bubbled with an inert gas (helium) from a bubbling pipe 6 to extract a dissolved component in a liquid, and the extracted gas is cooled and condensed by a cold trap pipe 15 to be collected and then a heater. The condensate is rapidly heated and vaporized by 7b, and quickly guided to the gas analyzer 23 for analysis, and the abnormality in the device is diagnosed from the type and amount of the component.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an oil-filled electric device,
For example, the present invention relates to a technique for diagnosing an internal abnormality of an oil-filled transformer.

[0002]

2. Description of the Related Art A gas having a low boiling point, such as methane or acetylene, which is dissolved in insulating oil, is subjected to a vacuum method (a vacuum space is created in a container accommodating the edge oil, and the dissolved gas in the oil is stored in this space). Extraction method) or bubbling method (inert gas such as helium gas is sent into the oil in the form of fine bubbles,
It is extracted from oil by the method of extracting dissolved gas) and analyzed by gas chromatography. This method for analyzing gas in oil has been reported as a method for diagnosing internal abnormalities in oil-filled electrical equipment (Reference Document 1: Electrical Cooperation Research Group “Maintenance and management of oil-filled electrical equipment by gas in oil analysis”, Electrical Cooperation Research, 36, N
o.1 (Sho 60).

A diagram of conventional gas analysis in oil is shown in FIG. In the figure, 1 is a sample oil storage container for storing sample oil, 2 is an oil injection port of the sample oil storage container 1, 3a and 3b are two-way cocks arranged on the flow path, 4 is an oil discharge port of the sample oil storage container, 5
Is a sample oil, 6 is a bubbling tube for feeding bubbling gas into the sample oil as fine bubbles, 7 is a heater for heating the sample oil, 8a and 8b are flow rate control valves for adjusting the gas flow rate, 9 Is a bubbling gas cylinder, 1
0 is a bubbling pipe for guiding the bubbling gas from the cylinder to the sample oil storage container 1, 11 is an extraction gas pipe for guiding the extracted gas together with the bubbling gas to the gas analyzer,
12a to 12c are three-way cocks arranged on the flow path, 23 is a gas analyzer, 24 is a column for component separation attached to the gas analyzer 23, 25 is a gas component detector, and 26 is a gas analyzer 23. It is a gas outlet.

The operation and operating procedure of the gas-in-oil analyzer configured as above will be described below. (1) Flow the bubbling gas from the cylinder 9 from the bubbling pipe 10 into the gas analyzer 23 and the sample oil storage container 1, and
Discharge from the direction cock 12b and the gas discharge port 26,
Clean the inside of the piping system. (2) When the gas analyzer becomes stable, the 3-way cock 12a-
12c is switched to bubbling gas by bubbling pipe 10, two-way cock 3b, flow rate adjusting valve 8a, bubbling pipe 6, extraction gas pipe 11, three-way cock 12a-12.
The gas is discharged from the gas discharge port 26 through the column c, the column 4, and the detector 25. (3) Inject a few ml of the sample oil sampled in the syringe into the sample oil container 1 through the oil inlet 2. (4) The injected sample oil is bubbled with a bubbling gas, the dissolved gas in the oil is extracted on the oil surface, and then it is introduced together with the bubbling gas to the gas analyzer 23 and the column 24
Is separated into each component and detected by the detector 25.

[0005]

The decomposed product generated due to the internal abnormality of the oil-filled electrical equipment can be gasified and extracted by the above-mentioned method. However, since the high boiling point component has a low vapor pressure, it is difficult to gasify and extract by the above method. For example, furfural, which is a decomposition product from insulating paper, is used as an index component of the life of oil-filled electrical equipment. Since this boiling point is 162 ° C., it cannot be extracted by the conventional vacuum method or bubbling method. With respect to furfural, a method has been reported in which it is extracted from insulating oil using a solvent and then analyzed by liquid chromatography. (Reference 2; Namba, Miyamoto “Adsorption Phenomenon of Furfural on Insulating Paper”, Theory of Electronics A, Vol. 112, No. 2, 1992)

The present invention has been made to solve the above problems, and in oil-filled electrical equipment, various types of high-boiling decomposition products generated from an insulating material due to internal abnormality can be efficiently generated from the insulating oil. The purpose is to perform an internal abnormality diagnosis of the oil-filled electrical equipment by extracting and subjecting these decomposed products.

[0007]

According to a first aspect of the present invention, there is provided a method for diagnosing an abnormality inside an oil-filled electrical device, wherein the insulating oil is heated at a temperature at which the vapor pressure becomes equal to or lower than a predetermined pressure (53 Pa) and is inert to the insulating oil. Gas is bubbled to extract the dissolved components in the insulating oil, and it is guided to the low temperature part via the space above the oil surface maintained at a predetermined temperature (80 to 150 ° C) to condense only the insulating oil dissolved components to supplement it. After collecting, the condensate is heated rapidly and the vaporized gas is not recondensed, and is quickly led to a gas analyzer for qualitative and quantitative analysis. It is characterized by diagnosing.

According to the inventions of claims 2 to 11, bubbling an inert gas into the liquid to extract a dissolved component in the liquid,
After cooling and condensing it to collect it, the condensate is heated rapidly and the vaporized gas is quickly guided to a gas analyzer for analysis. Analyzing compounds, alcohol compounds, aldehyde compounds, furan compounds, benzene compounds, nitrogen compounds, unsaturated hydrocarbon compounds, organic acids, sulfur compounds, etc.
It is characterized by diagnosing an abnormality inside the device from the type and amount of this component.

According to the twelfth aspect of the present invention, acetic acid [CH ₃ COOH], 3 pentanone [C] is not detected from the normal oil-filled electrical equipment during operation and is easily detected only when overheating or abnormal discharge occurs.
H ₃ CH ₂ COCH ₂ CH ₃ ], 2.5 dimethylfuran [C ₆
H ₈ O], butyraldehyde [CH ₃ CHCHCHO],
2-methoxyethanol _{[C 3 H 8 O 2]} , methanethiol [CH ₃ SH], dimethyl sulfide [(CH ₃₎
S ₂ ], ammonia [NH ₃ ], 1.3 diazine [C ₄ H ₄
N _2], methyl vinylacetylene [C ₅ H _6], the presence or absence of detection of such 2-methyl-1.3-butadiene [C ₅ H _8], wherein the diagnosing abnormality of the internal equipment.

A thirteenth aspect of the present invention is methylvinylacetylene [C which is predominantly produced from insulating oil by discharge decomposition.
It is characterized by distinguishing between abnormal overheating and abnormal discharge based on the presence or absence of detection of ₅ H ₆ ], 2-methyl 1.3 butadiene [C ₅ H ₈ ], etc.

According to a fourteenth aspect of the invention, ammonia [NH ₃ ] in the insulating oil, N—N dimethylmethanamine [C ₃ H
₉ N], acetonitrile [CH ₃ CN], propanenitrile [C ₃ H ₅ N], 1.3 diazine [C ₄ H ₄ N ₂ ], pyridine [C ₅ H ₅ N], 1H pyrrole [C ₄ H ₄ NH], 2-methylpyrimidine [C ₅ H ₆ N ₂ ], N-methylmethanamine [C ₂ H ₇ N], etc. are detected and it is specified that the material to be decomposed is a nitrogen-containing material, and this material is decomposed. Identify the location of the internal abnormality from the application location of the material.

The invention of claim 15 is based on the presence or absence of detection of butyraldehyde [CH ₃ CHCHCHO] in insulating oil.
The material to be decomposed is identified as a varnished material, and the location of the internal abnormality is identified from the location where the material to be decomposed is applied.

According to the sixteenth aspect of the present invention, it is specified from the presence or absence of detection of 2-methoxyethanol [C ₃ H ₈ O ₂ ] in the insulating oil that the material to be decomposed is an epoxy resin type material. Identify the location of the internal error from the application location.

The invention according to claim 17 is claim 2 to claim 1.
1. A specific decomposing product is selected from various decomposing products, the decomposing material is specified from the concentration ratio of these decomposing products, and the internal abnormality occurrence part is specified from the application place of this decomposing material. .

According to an eighteenth aspect of the present invention, a solid insulating material which generates a unique decomposed product by thermal decomposition is arranged at a predetermined position in the oil-filled electrical equipment, and the unique decomposed product is detected by the analysis method according to the first aspect. Then, the location where the internal abnormality occurs is specified from the location where the material to be decomposed is applied.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram showing a trace component analyzer in insulating oil of a transformer. In the figure, 1 is a sample oil storage container for storing sample oil, 2 is an oil inlet of the sample oil storage container 1,
3a and 3b are two-way cocks arranged on the flow path, 4 is an oil discharge port of the sample oil storage container 1, 5 is sample oil, 6 is a bubbling tube for sending bubbling gas into the sample oil as fine bubbles, 7a, 7b is a heater for heating the sample oil or the extraction gas, 8a to 8c are flow rate adjusting valves for adjusting the gas flow rate, 9 is a bubbling gas cylinder, and 10 is a bubbling gas from the cylinder 9 to the sample oil storage container 1. Bubbling pipe for, 11 is an extracted gas pipe for guiding the extracted gas together with the bubbling gas to the gas analyzer, 12a to
12 c is a three-way cock arranged on the flow path, 15 is a cold trap tube for concentrating the extracted gas, 16 is a cold trap tube storage chamber, 17 is a refrigerant inlet for cooling the cold trap tube, 18 is a refrigerant outlet, 19 Is a refrigerant container, 2
Reference numeral 0 is a refrigerant (liquid nitrogen), 21 is a refrigerant supply pipe for transferring the refrigerant 20 to the cold trap pipe housing chamber, 22 is a (nitrogen gas) pressurizing pipe for discharging the refrigerant 20 from the inside of the refrigerant container 19, 23 Is a gas analyzer, 24 is a column for component separation mounted in the gas analyzer 23, 25 is a gas component detector, and 26 is a gas outlet of the gas analyzer 23.

The operating procedure of the gas analyzer configured as described above is shown below. (1) When helium gas (bubbling gas) is supplied from the bubbling pipe 6 into the sample oil 5, the dissolved component in the oil reaches the cold trap pipe 15 together with the helium gas via the extraction gas pipe 11. (2) Since the cold trap tube storage chamber 16 is kept at a low temperature by the liquid nitrogen (refrigerant) 20, the components dissolved in oil are condensed or solidified and concentrated. (3) After bubbling for a certain period of time, all the dissolved components in oil are collected in the cold trap pipe 15. (4) The supply of liquid nitrogen 20 is stopped, and the heater 7 rapidly heats the cold trap tube storage chamber 16 to gasify the condensed or solidified material in the cold trap tube 15 and, at the same time, to gas the gas analyzer 23. Lead to. (5) The components are separated in the column 24, and the components are detected by the detector 25.

FIG. 2 shows an example of the result of analyzing the components in the insulating oil by the above-mentioned analysis method, and FIG. 3 shows the components of the peak No. of FIG. As the sample oil, the one obtained by decomposing insulating paper in oil was used. The condition of analysis is oil quantity 1
5 ml, oil temperature 50 ° C., bubbling time 7 minutes, cold trap temperature −130 ° C., analyzer is gas chromatograph mass spectrometer. By such an analysis, furfural, which is difficult to detect by the conventional gas analysis in oil, is clearly detected.

As described above, according to the first embodiment, since the dissolved components in oil extracted by bubbling are condensed and collected at a low temperature, a decomposed product having a low vapor pressure (high boiling point) is sufficiently extracted. it can. Further, since the condensed decomposed product is gasified in a short time and is instantaneously transferred to the gas analyzer, the output of each component becomes steep and the detection sensitivity is improved.

Embodiment 2. (Claims 2 to 11
4 to 6 show the results obtained by thermally decomposing insulating oil alone or various transformer materials in oil, and analyzing this oil by the method described in the first embodiment. The decomposition was performed by heating insulating paper, pressboard, wood, etc. in insulating oil at 100 to 250 ° C. The detected components are (1) diacetyl [CH ₃
COCOCH ₃ ], 2.3 pentanedione [CH ₃ CH ₂ C
OCOCH ₃ ], 3 pentanone [CH ₃ CH ₂ COCH ₂ C
H ₃ ], acetoin [CH ₃ COCH (OH) CH ₃ ],
4-pentene 2-on [C ₅ H ₈ O], 3-methyl 3-pentene 2
On [(CH ₃ ) ₂ CHCOCH ₃ ], hydroxyacetone [CH ₃ COCH ₂ OH], 3-methyl-2pentanone [C
₆ H ₁₂ O] and other ketone compounds, (2) ethyl formate [HCO
OC ₂ H ₅ ], methyl propionate [CH ₃ CH ₂ COOC
H _3], 2-hydroxypropionic acid methyl [C ₄ H
₈ O ₃ ], 1.2 ethanediol diacetate [C ₆ H ₁₀ O
₄ ], butyrolactone [C ₄ H ₆ O ₂ ], ester compounds, (3) methanol [CH ₃ OH], ethanol [C ₂ H
₅ OH], isopropyl alcohol [(CH ₃ ) ₂ CHO
H], allyl alcohol [CH ₂ CHCH ₂ OH], 2-methoxyethanol [C ₃ H ₈ O ₂ ], 1-butanol [C
Alcohol compounds such as H ₃ (CH ₂ ) ₃ OH], (4) 2-methylpropanal [(CH ₃ ) ₂ CHCHO], crotonaldehyde [CH ₃ CHCHCHO], butyraldehyde [CH ₃ (CH ₂ ) ₂ CHO] Aldehyde compounds such as
(5) 2.5 Dimethylfuran [C ₆ H ₈ O], 5 Methylfurfural [C ₈ H ₈ O ₂ ], 2 Furanmethanol [C ₄ H
Furan compounds such as ₃ OCH ₂ OH], tetrahydrofuran [C ₄ H ₈ O], dihydro 2 methyl 3 furan [C ₅ H ₈ O ₂ ], dihydro 5 methyl 2 furan [C ₅ H ₈ O ₂ ], (6) toluene [C ₇ H _8], p-cresol _{[C 6 H 4 (CH 3} )
(OH)], phenol [C ₆ H ₅ OH], benzene [C
₆ H ₆ ] and other benzene compounds, (7) ammonia [N
H _3], N-N-dimethyl-methanamine [C ₃ H ₉ N], acetonitrile [CH ₃ CN], propanenitrile [C ₃ H
₅ N], 1.3 diazine [C ₄ H ₄ N ₂ ], pyridine [C ₅ H
₅ N], 1H pyrrole [C ₄ H ₄ NH], 2 methylpyrimidine [C ₅ H ₆ N ₂ ], N methylmethanamine [C ₂ H
₇ N] and other nitrogen compounds, (8) 2-methyl 1.3-butadiene [C ₅ H ₈ ] and methylvinylacetylene [C ₅ H ₆ ] and other unsaturated hydrocarbon compounds, and (9) propionic acid [C ₃ H ₆ O
₂ ] organic acids such as (10) methanethiol [CH ₃ S
H], dimethyl sulfide [(CH ₃ ) ₂ S] and other sulfur compounds, and many types of decomposition products that are difficult to detect by conventional gas analysis have been detected.

As described above, according to the second embodiment, many kinds of organic compounds can be analyzed and diagnosed, so that the accuracy of determining the presence or absence of abnormality is improved. In addition, since the decomposition products to be analyzed have a high boiling point, and these are less diffused on the oil surface, the detection of the decomposition products is less overlooked and the abnormality detection accuracy is high.

Embodiment 3 FIG. (Corresponding to Claim 12) In the third embodiment, the components detected from fresh oil and transformer oil in normal operation are examined, and these components are removed from the decomposed products obtained in the insulation material decomposition experiment. Acetic acid of choice, 3
Analysis of pentanone, 2.5 dimethyl furan, butyraldehyde, 2 methoxy ethanol, methane thiol, dimethyl sulfide, ammonia, 1.3 diazine, 2 methyl 1.3 butadiene, and methyl vinyl acetylene revealed that these decomposition products were Determine whether there is any abnormality inside the equipment by checking whether it is detected in the insulating oil. From the abnormality simulation experiment of the present inventor and the investigation result of the actual equipment, it has been found that the above components are not detected in the normal oil-filled electrical equipment during operation, but are easily detected only in the case of overheating or abnormal discharge. As described above, according to this embodiment, the presence / absence of an internal abnormality is determined by targeting the components (mainly the 11 components described above) that are likely to occur when the internal abnormality of the device (abnormal heating, abnormal discharge). As a result, the reliability of the abnormality detection of the oil-filled electrical device is increased.

Embodiment 4 (Corresponding to claim 13) Among the decomposition products shown in the third embodiment, 2 methyl 1.3
Since butadiene and methylvinylacetylene are discharge decomposition products specific to insulating oil (discovered by discharge decomposition experiments by the present inventor), whether or not these decomposition products can be detected in insulating oil Identify whether the anomaly is due to overheating or discharge.
As described above, according to the fourth embodiment, it is possible to identify whether the abnormal state inside the device is discharge or overheating.

Embodiment 5 (Claims 14 to 1
(Corresponding to 6) In the fifth embodiment, the material to be decomposed is specified from the decomposed material unique to the insulating material, and the location of the internal abnormality is specified from the applicable range of the material to be decomposed. The relationship between the material to be decomposed and the decomposed product is shown below.・ Glass epoxy resin → 2 methoxy ethanol ・ Heat-resistant insulating paper (amine additive) → Ammonia (nitrogen compound), 1.3 diazines ・ Vanice-treated paper → Butanal Unique decomposition products are useful in determining damage to these materials Becomes Sulfur compounds such as methanethiol and dimethyl sulfide were detected in cellulosic materials such as coil insulation paper, pressboard, and heat-treated paper, but these sulfur compounds were detected in the same cellulosic materials such as cotton tape and birch wood. The compound is not detected. According to the fifth embodiment, since the specific decomposed material is targeted, the accuracy of specifying the material to be decomposed is improved, and therefore the accuracy of specifying the location of the internal abnormality is high.

Embodiment 6 FIG. (Corresponding to claim 17) The insulating oil obtained by heating and decomposing wood and coil insulating paper in oil is analyzed by the method described in the first embodiment, and formic acid is detected from among the detected decomposed products. When methyl, ethanol, furan, methyl acetate, diacetyl, 2 methylfuran, furfural, and dimethyl sulfide are selected and the ratio of each decomposed product to the total concentration is shown in a pattern diagram, it becomes as shown in FIG. 7. The pattern of ratios is different for wood and coil edge paper so that the material to be decomposed can be identified. Since the pattern differs depending on the selected component, the identification accuracy can be improved by selecting the component showing a large pattern difference. According to the sixth embodiment, the material to be decomposed can be easily identified from the pattern method.

Embodiment 7 (Corresponding to claim 18) Unique decomposition product (decomposition product containing nitrogen in a nitrogen-containing material,
For example, a solid insulating material known to be ammonia) is previously arranged at a location important for the performance of the oil-filled electrical equipment (for example, a coil portion or an iron core portion in the case of a transformer). If overheating or abnormal discharge occurs in the vicinity of this material, the heat decomposes the material, producing a unique decomposition product. Detect this.

According to the seventh embodiment, the abnormal portion in the electric device can be specified by detecting the unique decomposition product. By arranging materials with different unique decomposition products in many places, the accuracy of identifying the abnormal place is improved.

Embodiment 8 FIG. 8 shows an example of a new abnormality diagnosis procedure (flow chart) inside the oil-filled electrical device based on the above embodiment. In step 100 of FIG.
The analysis method according to claim 1 investigates whether or not abnormal index components (acetic acid, methanethiol, etc.) that are not detected in normal oil-filled electrical equipment (transformer) and fresh oil that are in operation are detected. Next, in step 110, the abnormality index component is
It is investigated whether it is a specific discharge decomposition component (methyl vinyl acetylene, 2 methyl 1.3 butadiene) generated from insulating oil by discharge or an abnormal index component other than the discharge decomposition component. In step 120, it is checked whether or not the unique component of the insulating material is detected, and in step 140, the damaged material is identified by the unique component (fifth embodiment). On the other hand, in step 130, the damaged material is identified from the component pattern diagram (Embodiment 6).

In the above embodiment, the gas chromatograph mass spectrometer is used as the gas analyzer, but the gas chromatograph has the same effect. Further, it goes without saying that the above-described embodiment can be used for analysis of index components for life diagnosis.

[0030]

As described above, according to the present invention, it is possible to analyze a relatively high molecular weight, high boiling point abnormal indicator decomposition product dissolved in insulating oil, and to diagnose an abnormality inside an oil-filled electrical device. The accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a trace component analyzer in insulating oil used in an embodiment of the present invention.

FIG. 2 shows an example of a result obtained by analyzing components in insulating oil by the analysis method according to the first embodiment.

FIG. 3 shows components of peak No. in FIG.

FIG. 4 shows results obtained by thermally decomposing insulating oil alone or various transformer materials in oil, and analyzing this oil by the method shown in the first embodiment.

FIG. 5 shows the same analysis result as in FIG.

FIG. 6 shows the same analysis result as in FIG.

FIG. 7 shows a component ratio pattern diagram in the sixth embodiment.

FIG. 8 shows an abnormality diagnosis procedure (flow chart) according to the eighth embodiment.

FIG. 9 is a configuration diagram showing a conventional trace component analyzer in insulating oil.

[Explanation of symbols]

1 sample oil storage container, 5 sample oil, 6 bubbling tube,
7a, b heater, 9 inert gas cylinder, 10 bubbling pipe, 11 extraction gas pipe, 15 cold trap pipe, 16 cold trap pipe storage chamber, 20 refrigerant (liquid nitrogen), 23 gas analyzer, 24 column, 2
5 Detector.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shigemitsu Okabe 1-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Company (72) Inventor Takahiro Ohno 1-3-1 Uchiyuki-cho, Chiyoda-ku, Tokyo Within Tokyo Electric Power Co., Inc.

Claims (18)

[Claims] 1. An insulating oil is heated at a temperature at which a vapor pressure becomes equal to or lower than a predetermined pressure, and an inactive gas is bubbled through the insulating oil to extract a dissolved component in the insulating oil. After passing through the low temperature part to condense and collect only the insulating oil-dissolved component, quickly heat the condensate to quickly guide it to the gas analyzer without recondensing the vaporized gas and conduct qualitative analysis. A method for diagnosing an abnormality inside an oil-filled electrical device, which comprises performing a quantitative analysis and diagnosing an abnormality inside the device from the type and amount of the detected components. 2. A liquid is bubbled with an inert gas to extract a dissolved component in the liquid, which is cooled and condensed to be collected, and then the condensate is rapidly heated to vaporize the vaporized gas. using an apparatus to analyze quickly led to an analyzer, diacetyl dissolved in insulating oil _{[CH 3 COCOCH 3], 2} .
3 pentanedione [CH ₃ CH ₂ COCOCH ₃ ], 3 pentanone [CH ₃ CH ₂ COCH ₂ CH ₃ ], acetoin [CH ₃ COCH (OH) CH ₃ ], 4 pentene 2 one [C ₅ H ₈ O], 3 Methyl 3 pentene 2 on [(CH ₃ ) ₂
CHCOCH ₃ ], hydroxyacetone [CH ₃ COCH
Abnormalities inside oil-filled electrical equipment characterized by analyzing ketone compounds such as ₂ OH] and 3 methyl 2 pentanone [C ₆ H ₁₂ O] and diagnosing abnormalities inside the equipment from the type and amount of these components. Diagnostic method. 3. A liquid is bubbled with an inert gas to extract a dissolved component in the liquid, which is cooled and condensed to be collected, and then the condensate is rapidly heated to gasify the vaporized gas. using an apparatus for analyzing quickly led to the analyzer, ethyl formate to dissolve in insulating oil [HCOOC ₂ H _5], methyl propionate _{[CH 3 CH 2 COOCH 3]} , 2- hydroxy acid methyl [C ₄ H ₈ O ₃ ], 1.2 ethanediol diacetate [C ₆ H ₁₀ O ₄ ], butyrolactone [C
₄ H ₆ O ₂ ], etc. is analyzed, and the abnormality inside the equipment is diagnosed based on the type and amount of this component, and the abnormality diagnosis method inside the oil-filled electrical equipment is characterized. 4. An inert gas is bubbled into a liquid to extract a dissolved component in the liquid, which is cooled and condensed to be collected, and then the condensate is rapidly heated to gasify the vaporized gas. Using a device that quickly guides to an analyzer for analysis, methanol [CH ₃ OH], ethanol [C ₂ H ₅ OH], isopropyl alcohol [(CH ₃ ) ₂ dissolved in insulating oil are used.
CHOH], allyl alcohol [CH ₂ CHCH ₂ O
H], 2 methoxyethanol [C ₃ H ₈ O ₂ ], 1-butanol [CH ₃ (CH ₂ ) ₃ OH] and other alcohol compounds are analyzed, and abnormalities inside the equipment are diagnosed from the type and amount of these components. A method for diagnosing an abnormality inside an oil-filled electrical device, which comprises: 5. An inactive gas is bubbled into the liquid to extract a dissolved component in the liquid, which is cooled and condensed to be collected, and then the condensate is rapidly heated to gasify the vaporized gas. 2 Methylpropanal [(CH ₃ ) ₂ CHC dissolved in insulating oil using a device that quickly leads to an analyzer for analysis
HO], crotonaldehyde [CH ₃ CHCHCH
O], butyraldehyde [CH ₃ (CH ₂ ) ₂ CHO] and other aldehyde compounds are analyzed, and an abnormality inside the equipment is diagnosed based on the type and amount of this component. Diagnostic method. 6. A liquid is bubbled with an inert gas to extract a dissolved component in the liquid, which is cooled and condensed to be collected, and then the condensate is rapidly heated to gasify the vaporized gas. 2.5 Dimethylfuran [C ₆ H ₈ O], 5 Methylfurfural [C ₈ H ₈ O ₂ ], 2 furanmethanol [C ₄ ] dissolved in insulating oil using a device that quickly leads to an analyzer for analysis H ₃ OCH ₂ OH], tetrahydrofuran [C ₄ H ₈
O], dihydro 2 methyl 3 furan [C ₅ H ₈ O ₂ ], dihydro 5 methyl 2 furan [C ₅ H ₈ O ₂ ] and other furan compounds were analyzed, and abnormalities inside the equipment were determined from the type and amount of this component. A method for diagnosing an abnormality inside an oil-filled electrical device, which is characterized by diagnosing. 7. A liquid is bubbled with an inert gas to extract a dissolved component in the liquid, which is cooled and condensed to be collected, and then the condensate is rapidly heated to gasify the vaporized gas. Toluene [C ₇ H ₈ ] and para-cresol [C], which dissolve in insulating oil, are used by a device that quickly leads to an analyzer for analysis.
₆ H ₄ (CH ₃ ) (OH)], phenol [C ₆ H ₅ O
H], benzene [C ₆ H ₆ ] and other benzene compounds are analyzed, and the abnormality inside the equipment is diagnosed based on the type and amount of this component. 8. A liquid is bubbled with an inert gas to extract a dissolved component in the liquid, which is cooled and condensed to be collected, and then the condensate is rapidly heated to gasify the vaporized gas. using an apparatus for analyzing quickly led to the analyzer, ammonia dissolved in the insulating oil [NH _3], N-N-dimethyl-methanamine [C ₃ H ₉ N], acetonitrile [CH ₃ C
N], propanenitrile [C ₃ H ₅ N], 1.3 diazine [C ₄ H ₄ N ₂ ], pyridine [C ₅ H ₅ N], 1H pyrrole [C ₄ H ₄ NH], 2 methylpyrimidine [C ₅ H ₆ N ₂ ],
A method for diagnosing an abnormality inside an oil-filled electrical device, which comprises analyzing a nitrogen compound such as N-methylmethanamine [C ₂ H ₇ N] and diagnosing an abnormality inside the device from the type and amount of this component. 9. An inactive gas is bubbled into the liquid to extract a dissolved component in the liquid, which is cooled and condensed to be collected, and then the condensate is rapidly heated to gasify the vaporized gas. Analysis of unsaturated hydrocarbon compounds such as 2-methyl 1.3 butadiene [C ₅ H ₈ ] and methyl vinyl acetylene [C ₅ H ₆ ] dissolved in insulating oil using a device that quickly guides and analyzes them in an analyzer Then, the abnormality diagnosis method inside the oil-filled electrical equipment is characterized by diagnosing the abnormality inside the equipment from the type and amount of this component. 10. An inert gas is bubbled into the liquid to extract a dissolved component in the liquid, which is cooled and condensed to collect the condensed component, and then the condensate is rapidly heated to gasify the vaporized gas. It is characterized by analyzing organic acids such as propionic acid [C ₃ H ₆ O ₂ ] dissolved in insulating oil by using a device for quickly guiding to an analyzer and diagnosing abnormalities inside the equipment. A method for diagnosing abnormalities inside oil-filled electrical equipment. 11. An inert gas is bubbled into a liquid to extract a dissolved component in the liquid, which is cooled and condensed to collect the condensed component, and the condensed product is rapidly heated to gasify the vaporized gas. Using a device that quickly guides to an analyzer to analyze, sulfur compounds such as methanethiol [CH ₃ SH] and dimethyl sulfide [(CH ₃ ) S ₂ ] which are dissolved in insulating oil are analyzed, and the type of this component and A method for diagnosing an abnormality inside an oil-filled electrical device, which comprises diagnosing an abnormality inside the device from the amount. 12. An acetic acid [CH ₃ COOH], 3 pentanone [CH ₃ CH ₂ COC, which is not detected by a normal oil-filled electric device during operation and is easily detected only when overheating or abnormal discharge occurs.
H ₂ CH _3], 2.5-dimethyl furan [C ₆ H ₈ O], butyraldehyde [CH ₃ CHCHCHO], 2-methoxyethanol _{[C 3 H 8 O 2]} , methanethiol [CH ₃ S
H], dimethyl sulfide [(CH ₃ ) S ₂ ], ammonia [NH ₃ ], 1.3 diazine [C ₄ H ₄ N ₂ ], methyl vinyl acetylene [C ₅ H ₆ ], 2 methyl 1.3 butadiene [ C ₅ H ₈ ] etc., the abnormality diagnosis method inside the equipment is characterized by diagnosing the abnormality inside the equipment. 13. Abnormal overheating and abnormal discharge depending on the presence or absence of detection of methylvinylacetylene [C ₅ H ₆ ], 2-methyl 1.3 butadiene [C ₅ H ₈ ] etc. which are predominantly produced from insulating oil by discharge decomposition. A method for diagnosing an internal abnormality in an oil-filled electrical device, characterized by identifying 14. Ammonia [NH ₃ ], N in insulating oil
-N dimethylmethanamine [C ₃ H ₉ N], acetonitrile [CH ₃ CN], propanenitrile _{[C 3 H 5 N],} 1.
3 diazine [C ₄ H ₄ N ₂ ], pyridine [C ₅ H ₅ N], 1
H-pyrrole [C ₄ H ₄ NH], 2-methylpyrimidine [C ₅
H ₆ N _2], the presence or absence of detection of such N-methyl-methanamine [C ₂ H ₇ N], specifies that the decomposition material is a nitrogen-containing material, an internal abnormality occurrence location from application point of the decomposition material A method for diagnosing an abnormality inside an oil-filled electrical device, which is characterized by specifying 15. Butyraldehyde [CH _{3 in} insulating oil]
[CHCHCHO] detection, it is determined that the material to be decomposed is a varnish treated material, and the location of the internal abnormality is identified from the application location of the material to be decomposed. . 16. 2-methoxyethanol [C in insulating oil]
₃ H ₈ O ₂ ] detection, it is specified that the material to be decomposed is an epoxy resin material, and the location of the internal abnormality is identified from the application point of this material to be decomposed. Internal abnormality diagnosis method. 17. A specific decomposing product is selected from the various decomposing products of claims 2 to 11, a decomposing material is specified based on a concentration ratio of these decomposing products, and the interior of the decomposing material is applied. A method for diagnosing an abnormality inside an oil-filled electrical device, which is characterized by identifying a location of an abnormality. 18. A fixed insulating material, which generates a unique decomposition product by thermal decomposition, is arranged at a predetermined position of the oil-filled electrical device, and
The method for diagnosing an abnormality inside an oil-filled electrical device, which is characterized by detecting a unique decomposition product by the analysis method described in 1 above and identifying the location of the internal abnormality from the location where the material to be decomposed is applied.