JP2002005840A - Method and apparatus for diagnosis of deterioration of oil-filled electrical apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To infer the remaining life of an oil-filled electrical apparatus by measuring the generated amount of the degradation product of a sheet of insulating paper dissolved in an insulating oil with a detecting agent. SOLUTION: A volatile component, which is dissolved in the insulating oil of the oil-filed electrical apparatus and which is composed of aldehydes, ketones or the like, is extracted. The extracted volatile component is reacted with a filler, which is reacted specifically with the volatile component. The color value of its color region is correlated with an average degree of polymerization, which expresses the deterioration degree of the sheet of insulating paper which is set in advance. By taking into consideration the average polymerization degree of the sheet of insulating paper in the color value, the deterioration degree of the electrical apparatus is diagnosed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for measuring the degradation products (eg, aldehydes and ketones) dissolved in insulating oil of oil-filled electrical equipment by simple means, and measuring the content of the degradation products. The present invention relates to a simple method for diagnosing deterioration of an oil-filled electric device and estimating a device thereof for estimating a remaining life of the oil-filled electric device in accordance with the following.

[0002]

2. Description of the Related Art When considering the efficient use of oil-filled electrical equipment typified by oil-filled transformers and condensers, it is necessary to determine whether replacement, removal, or repair is necessary or not at the optimal time. The need to quickly establish a method for non-destructively evaluating the state of deterioration of insulating materials of oil-filled electrical equipment such as transformers is increasing every day.

In oil-filled electrical equipment, for example, when the deterioration of an insulating material (insulating paper) wound on a coil of an oil-filled transformer progresses, an electrical stress due to a lightning strike or an external short circuit occurs. When subjected to mechanical stress due to electromagnetic force, the oil-immersed transformer has an increased risk of being destroyed.

[0004] The tendency of the coil insulating paper, which determines the service life of the oil-immersed transformer, to deteriorate over time, shows that the insulation performance is hardly deteriorated, but the tensile strength is more than ten years old.
In some cases, it has decreased to about 30% of the initial value, and the mechanical strength of the insulating paper itself is considered to be a major problem in determining the deterioration of the device (life expectancy). As a result, it is very important to know how low the mechanical strength of the insulating paper will be to hinder the continuation of the operation of the equipment.

The above problem can be easily grasped by measuring the average degree of polymerization of the insulating paper in the oil-immersed transformer during operation. However, as a practical problem, it is necessary to take out the insulating paper from the operating device and perform a deterioration diagnosis. Is physically impossible, ie
A major issue has been how to measure the average degree of polymerization of insulating paper by a non-destructive method.

[0006] For this reason, it has been well known among concerned persons that, when insulating paper is deteriorated, furfural is generated due to a decrease in the average degree of polymerization, and this is dissolved in insulating oil. On the other hand, it is well known that there is a correlation between the tensile strength of the insulating paper, the average residual polymerization degree, and the amount of furfural produced. Therefore, if the amount of furfural dissolved in the insulating oil is measured, the degree of deterioration of the insulating paper, that is,
The remaining life of the oil-filled transformer can be estimated. But,
The measurement of the amount of furfural dissolved in the insulating oil has hitherto been performed using, for example, a high performance liquid chromatograph.

[0007]

When the concentration and amount of furfural in insulating oil are measured by using the high performance liquid chromatograph, the handling requires extremely skill and the high performance liquid gas chromatograph itself is expensive. There was a problem. In addition, because the high-performance liquid chromatograph itself is a heavy object, it is used by being mounted on a mobile diagnostic vehicle or the like.For example, depending on the installation location of the oil-immersed transformer, if the vehicle cannot be driven, After collecting the sample oil, it must be transported to the place where the vehicle is parked to analyze the gas components and the like dissolved in the insulating oil, that is, it is not suitable for carrying and carrying. For,
The on-site life assessment of oil-filled transformers, coupled with the need for skilled technicians, was labor intensive and labor intensive, and was inefficient.

When activated alumina for purifying insulating oil is immersed in the oil-immersed transformer in the oil, even if the furfural is dissolved in the insulating oil, it is adsorbed on the activated alumina over time. Therefore, when estimating the remaining life of this type of equipment, even if the concentration of the furfural is measured, if the remaining amount is reduced due to adsorption, the remaining life diagnosis based on the measurement result will be performed. However, there is a problem that a question as to whether or not it is correct arises.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a method for diagnosing deterioration of oil-filled electrical equipment, which can be performed easily and at low cost, and a diagnostic apparatus which is easy to carry. To provide.

[0010]

According to the present invention, there is provided a method for diagnosing deterioration of an oil-filled electrical device according to the first aspect of the present invention, which is dissolved in insulating oil of the oil-filled electrical device. Volatile components composed of aldehydes, ketones, etc. are extracted, and the extracted volatile components are reacted with a filler that reacts specifically with the volatile components, and the color values in the color gamut are set in advance. The average degree of polymerization of the insulating paper at the color value is determined based on the correlation with the average degree of polymerization indicating the degree of deterioration of the insulating paper, and the degree of deterioration of the oil-filled electrical device is diagnosed.

According to a second aspect of the present invention, there is provided a method for diagnosing deterioration of an oil-filled electric device, wherein the filler which specifically reacts with the volatile component is hydrazine such as 2,4-dinitrophenylhydrazine. It is characterized by using a kind.

According to a third aspect of the present invention, there is provided a deterioration diagnosis apparatus for an oil-filled electric device, comprising: extraction means for extracting a volatile component such as a dissolved gas dissolved in oil from insulating oil; Calibration means filled with a colorant that causes a specific reaction with the volatile components such as aldehydes and ketones contained in the volatile component, and a colorant that is communicated with the calibration means to extract the color from the insulating oil in the extraction means. Extraction drive means for extracting volatile components.

According to a fourth aspect of the present invention, there is provided the deterioration diagnosis apparatus for oil-filled electrical equipment according to the third aspect, wherein a plurality of calibration means communicating with the extraction means are connected in parallel with the extraction means. It is characterized by being connected and configured.

In the present invention, when measuring volatile components such as aldehydes and ketones in insulating oil, a calibration method is used in which a filler that specifically reacts with the volatile components dissolved in insulating oil is packed. The volatile component extracted from the insulating oil is sent to the means, and the volatile component reacts with the filler to form a color. The numerical value of the color range is visually recognized (read).
As a result, the average degree of polymerization of volatile components was measured, and the deterioration (estimating the remaining life) of the oil-filled electrical equipment was diagnosed based on the measured value. As compared with the case where the deterioration diagnosis is performed by using the diagnosis, there is an effect that the operation can be performed simply, easily, and at a low cost.

Further, when measuring volatile components such as aldehydes extracted from the insulating oil, an extraction means for extracting the volatile components from the insulating oil, and a calibration for presenting the color gamut of the extracted volatile components. By combining the means and the means, it is possible to easily configure the deterioration diagnosis device, so that it is possible to perform the deterioration diagnosis at the installation location of the oil-filled electrical equipment, that is, to carry the deterioration diagnosis device Diagnosis can be performed easily and economically without the need for expensive measuring equipment such as a high-performance liquid chromatograph or skilled technicians. Deterioration diagnosis can be performed, which is convenient.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a vertical cross-sectional view of an oil-filled electric device such as a transformer (hereinafter, referred to as a transformer) 1 in which insulating oil is sealed. A transformer main body 2 formed by winding a coil 1b around an iron core 1a is housed in a case 3. Then, the insulating oil 4
Was injected and sealed. Reference numeral 5 denotes an oil drain cock provided at a lower portion of the case 3 for extracting the insulating oil 4.

In FIG. 2, reference numeral 6 denotes the insulating oil 4 in the case 3.
The syringe 6 can be used to remove a predetermined amount of the insulating oil 4 without exposing the insulating oil 4 to the container 6 in the same manner as the operation of the syringe.
By moving the piston rod 6a in the direction in which the piston rod 6a is pulled out from the inside b, the insulating oil 4 can be easily collected in the syringe 6.

Next, the configuration of the deterioration diagnosis apparatus 11 of the present invention will be described with reference to FIG. This degradation diagnostic device 11
Is roughly divided into extraction means 12 for extracting residual gas dissolved in the insulating oil 4 and volatile components (deterioration products).
And a volatile component used for diagnosing the deterioration of the transformer 1 by reacting with the volatile component used for the deterioration diagnosis of the transformer 1 to form a predetermined color and reading the numerical value of the color gamut. And an extraction drive unit 14 for extracting volatile components such as dissolved gas components from the insulating oil 4.

Next, the structure of each means will be described.
First, the extracting unit 12 will be described. The extracting means 12 includes an oil collecting bin 15 for storing the insulating oil 4 extracted from the transformer 1.
A cover 15a is always attached to prevent dust and the like from entering the inside. The cover 15a of the oil sampling bin 15 has an inflow pipe 16 for injecting the insulating oil 4, the outside air or the compressed air into the oil sampling bin 15, and the dissolved gas and volatile components extracted by bubbling to the calibration means 13. Feed pipes 17 for feeding are provided with required lengths in the vertical direction, and are connected in a gas-tight manner.

Reference numeral 18 denotes a heating device for the oil sampling bin 15, which heats the insulating oil 4 in the oil sampling bin 15 to a required temperature so as to satisfactorily extract dissolved gas components and the like.
For example, it is formed by disposing an electric heater 19 inside the housing. In addition, about the said heating apparatus 18,
Although there is no need for a power source at the site where the insulating oil 4 is collected, it is not always necessary, but in this case, the problem of the power source can be solved by bringing a portable generator or battery.

Next, the structure of the calibration means 13 will be described. The calibrating means 13 contains a filler which has a specific color by reacting specifically with volatile components such as aldehydes and ketones extracted together with various dissolved gas components by bubbling of the insulating oil 4 therein. It has a detection tube 20 made of transparent glass or synthetic resin sealed therein. One end of the detection tube 20 is air-tightly connected to the tip of a feed tube 17 having one end connected to the oil sampling bin 15. Installed. The other end of the detection tube 20 is connected to the extraction driving means 14 via a connection tube 21.

As the filler sealed in the detection tube 20, for example, hydrazines such as 2,4-dinitrophenylhydrazine which reacts specifically with aldehydes extracted from the insulating oil 4 may be used such as silica gel or alumina. The surface of the is coated or mixed, and a granular filler (hereinafter, referred to as a detecting agent) formed by being mixed is fixedly filled, and the detecting agent reacts only with a gas to be measured to form a color,
It is formed so as to show a clear color gamut and maintain the color gamut stably for a long period of time. The detection tube 20 is provided with a scale 22 (see FIG. 5) for each predetermined dimension so that the color gamut can be measured quantitatively and accurately.

Each time a volatile component such as an aldehyde extracted from the insulating oil 4 of the transformer 1 is measured, the detecting tube 20 is airtight between the feeding tube 17 and the extraction driving means 14 described later. Connect to and use. Next, the structure of the extraction driving means 14 connected to the detection tube 20 will be described. This extraction means 14, as shown in FIG.
Built-in manual piston 24 in cylinder 23
A suction pump 25 configured to allow air to flow through the cylinder 23 and the connecting pipe 2
One check valve 26 is connected to the cylinder 23
The other check valve 27 is provided in the upper part of the tip of the other.

The check valve 26 connected to the connecting pipe 21 is
When the manual piston 24 is pulled to open a volatile component such as a dissolved gas component flowing through the detection tube 20 into the cylinder 23, it is opened when the manual piston 24 is pushed back into the cylinder 23. It closes so that ventilation etc. are not sent to the detection tube 20 side. The other check valve 27 attached to the top of the tip of the cylinder 23 causes the volatile component such as a dissolved gas component which does not react with the detection agent passed through the inside of the detection pipe 20 by the operation of the manual piston 24 to become a cylinder 23. When it flows into the cylinder, it closes.
When the manual piston 24 is pushed into the cylinder 23 in order to discharge the air inside the cylinder 23, the manual piston 24 is opened and the volatile components and the like in the cylinder 23 are discharged outside the cylinder 23. This is because, when the manual suction pump 25 is driven, the outside air flows back into the detection tube 20 and the volatile components extracted from the insulating oil 4 and the outside air are mixed with each other. To prevent harm to the environment.

Next, the operation will be described. First, a sample oil (insulating oil 4) for extracting required dissolved gas components and the like is extracted from the transformer for which the life is predicted. In this case, for example, as shown in FIGS. 1 and 2, a second outlet provided with a small-diameter drain pipe 7 for wiping insulating oil is provided on a flange of an oil drain cock 5 provided below the case 3 of the transformer 1. The drain cock 5a is mounted oil-tight. Thereafter, the oil drain cocks 5 and 5a are sequentially opened with the small diameter oil jet cylinder at the tip of the syringe 6 closely fitted to the discharge pipe 7. When the oil drain cocks 5 and 5a are opened, the insulating oil 4 in the case 3 flows out to the discharge pipe 7, but since the distal end of the syringe 6 is tightly fitted to the discharge pipe 7, the insulating oil 4 is discharged. It does not leak out of the pipe 7.

In this state, the piston 6a of the syringe 6 is gradually retracted in the same manner as a syringe, and the insulating oil 4 is injected into the container 6b of the syringe 6 almost without contacting the atmosphere with, for example, 5 to 50 ml. Let it. When the insulating oil 4 is injected into the syringe 6, the oil drain cocks 5 and 5 a are closed, and the oil jet cylinder at the tip of the syringe 6 is pulled out from the discharge pipe 7, thereby completing the oiling of the insulating oil 4. Next, the syringe 6
After a predetermined amount of the insulating oil 4 is collected, the oil cylinder of the syringe 6 is inserted into the inflow pipe 16, and the piston rod 6 a of the syringe 6 is pushed to inject the insulating oil 4 in the container 6 b into the oil collecting bottle 15. At this time, since the leading end of the feed pipe 17 protruding from the oil sampling bin 15 is not connected to the detection pipe 20 and is open to the atmosphere, the transfer of the insulating oil 4 to the oil sampling bin 15 can be easily performed. It can be carried out.

When the insulating oil 4 is injected into the oil sampling bottle 15, the insulating oil 4 in the container 6b is removed from the injection cylinder of the syringe 6 by removing the cover 15a and not from the inflow pipe 16. When injecting the oil from the inflow pipe 16 or the inflow pipe 16, as described above, the insulating oil 4 is not connected to the detection pipe 20 without opening the tip of the feed pipe 17, and the insulating oil 4 is supplied to the oil sampling bottle 15. May be injected. In this case, even if the opposite side of the detection tube 20 that is not connected to the feed tube 17 is left open or the suction pump 25 is attached to that portion,
The insulating oil 4 can be well injected into the oil sampling bin 15.

As described above, after the insulating oil 4 sampled as a sample oil for estimating the life expectancy of the transformer 1 is injected into the oil sampling bin 15, the insulating oil 4 is heated to about 55 to 60 ° C. by the heating device 18. Heat to a temperature of During this time, the detector tube 2
0 is connected between the feeding pipe 17 and the suction pump 25 by piping. Next, a case where a volatile component including a required dissolved gas component and the like is extracted from the insulating oil 4 injected into the oil sampling bin 15 by bubbling will be described. In extracting the dissolved gas component and the like, the manual piston 24 of the suction pump 25 is used.
3 (right side in FIG. 3), outside air flows in from the open end of the inflow pipe 16 (the end of the inflow pipe 16 protruding above the oil sampling bin 15 from the cover body 15a), and this outside air is insulated Air bubbles are ejected from the lower end of the inflow pipe 16 immersed in the insulating oil 4 into the insulating oil 4.

By blowing the outside air into the oil,
That is, the insulating oil 4 in the oil sampling bin 15 is caused by the bubbling phenomenon.
Volatile components consisting of degradation products dissolved therein are extracted and introduced into the detection tube 20 through the feed tube 17.
The volatile components include carbon monoxide (CO), carbon dioxide (CO ₂ ), methane (CH ₄ ), hydrogen (H ₂ ), ethane (C ₂ H ₆ ), ethylene (C ₂ H ₄ ), and acetylene ( C
₂ H ₂ ), formaldehyde (HCHO), acetaldehyde (CH ₃ CHO), acrolein (CH
₂ : aldehydes such as CHCHO) and acetone (CH ₃
COCH), methyl ethyl ketone (CH ₃ CH ₂ COC)
Ketones such as H ₃ ) and furfural (C
₄ H ₃ OCHO) and the like are extracted as volatile components.

As a means for judging the aging of the transformer 1, attention has been focused on the degradation products contained in the insulating oil. In particular, in order to grasp the aging of the transformer, the properties of the used insulating oil and paper material have a great effect. Is cut off, and the molecular weight of cellulose decreases. The chain length of the cellulose molecule is the average degree of polymerization and is used as an index of the degree of mechanical deterioration of the insulator.

The average degree of polymerization has a correlation with the tensile strength, and the deterioration state of the mechanical strength can be diagnosed by the average degree of polymerization. In general, when measuring the average degree of polymerization, a deterioration diagnosis is performed by measuring the amount of CO, CO ₂ or furfural, which is said to be a degradation product of the insulating paper dissolved in the insulating oil 4, and diagnoses the transformer. This is the basis for estimating the life expectancy.

However, since CO and CO ₂ are gases (gas), in an open-type transformer such as a pole transformer, a relatively small-capacity transformer such as partly dissipating into the atmosphere is used. In the case, the measured value varies relatively depending on the method of filling the insulating oil and the drying method in the manufacturing process.
If the measured values are used as they are, a large error may occur in the deterioration diagnosis. For this reason, in order to correct the above-mentioned variation, the life has been predicted by calculating and processing the correction value and the measured value which are set in advance assuming the variation, and it has been difficult to perform an appropriate life prediction.

On the other hand, the boiling point of furfural is 1
As it is a liquid at 60 ° C and has high solubility in insulating oil, it has no problems such as CO and CO ₂ , but as mentioned above, it has a built-in activated alumina that purifies insulating oil. In such a transformer, there was a problem that the furfural was gradually adsorbed on the activated alumina with the passage of time, and it was difficult to accurately determine the amount of the produced furfural. Therefore, even if the life prediction using furfural, the CO, so it was processing the measured values of furfural using similar correction value and CO _2, even in this case, in order to perform the correct lifetime prediction There were various problems.

As described above, cellulose is CO,
As with CO ₂ and furfural, aldehydes and ketones are also produced as degradation products in the course of degradation, and furthermore, when oxidative degradation of the insulating oil itself is accelerated, acetone (ketones) cannot be produced. Well known today. Moreover,
Unlike the furfural, the aldehydes and ketones are less likely to be adsorbed by activated alumina, and hardly gasify and dissipate into the atmosphere like CO and CO _2. It is dissolved in a liquid state.

As described above, in the present invention, when performing the deterioration diagnosis of the transformer, the deterioration products are sequentially generated as the deterioration of the insulating paper or the insulating oil progresses and dissolved in the insulating oil. By measuring aldehydes and ketones, the life expectancy of the transformer is easily predicted.

The extraction of the aldehydes and ketones dissolved in the insulating oil 4 is performed by driving the manual piston 24 of the suction pump 25 as in the case of extracting other dissolved gases. That is, the paragraph number [002
8], the piston 24 is connected to the cylinder 23
The gas dissolved in the insulating oil 4 by a so-called bubbling action, in which the outside air is sucked from the inflow pipe 16 to generate bubbles in the insulating oil 4 by drawing in the direction (right side in FIG. 3). Decomposition products such as are gasified (volatilized) and extracted.

The volatile components such as the extracted dissolved gas components flow into the detection pipe 20 from the upper portion of the oil collecting bottle 15 through the feed pipe 17. If there is a volatile component that specifically reacts with the detection agent as a filler enclosed in the detection tube 20, the volatile component is changed from the primary color to a required color by a specific reaction. Become. On the other hand, when the volatile component that reacts with the detecting agent is not extracted, the detecting agent does not react at all, and the volatile component such as the dissolved gas component that is extracted is sucked through the detection tube 20 as it is. The check valve 26 of the pump 25 is opened to flow into the cylinder 23. When the manual piston 24 is pushed back into the cylinder 23 in preparation for the next bubbling, the volatile component that has flowed into the cylinder 23 opens the check valve 27 and is discharged to the outside.

The internal volume of the cylinder 23 is about 1
It is formed by a size of about 00 ml, and each time the manual piston 24 is operated (pulled) once, it can receive a volatile component such as an extracted dissolved gas component,
On the other hand, when the manual piston 24 is pushed back into the cylinder 23, on the other hand, all the volatile components and the like staying in the cylinder 23 are discharged to the outside via the check valve 27 without flowing back into the detection pipe 20. It is provided to be able to.

After the manual piston 24 is pulled out of the cylinder 23, it is pushed back into the cylinder 23 in preparation for the next extraction. At this time, the air or the like in the cylinder 23 does not flow back into the detection pipe 20 by closing the check valve 26,
7, the operation of the manual piston 24 can be easily performed. When the manual piston 24 is returned to the original position, the manual piston 24 is driven again in the pulling-out direction to perform the next bubbling, and volatile components composed of degradation products such as various gas components dissolved in the insulating oil 4. Is extracted. The extracted volatile components sequentially flow into the detection tube 20.

When the volatile components such as aldehydes and ketones are contained in the degradation products extracted from the insulating oil 4 by the bubbling action, these volatile components are contained in the detection tube 20. When it comes into contact with and reacts with the enclosed detection agent, that is, it reacts specifically with hydrazines contained in the detection agent to give a color.

In the case of aldehydes, the above-mentioned color changes from yellow to reddish brown, and in the case of ketones, the color changes to yellow-brown, for example. In the case of the present invention, when the aldehydes and ketones are extracted, the color to be formed is a color corresponding to the volatile component with a relatively large extraction amount because the detection agent is formed so as to be colored. Color. For example,
If the aldehydes and ketones are evenly divided, the desired color is displayed in a predetermined color gamut according to the amount of both volatile components, and when one volatile component is larger than the other volatile component, In general, it is colored with a color close to a volatile component with a large amount of extraction.

In any case, if the volatile component extracted from the insulating oil 4 is a component that reacts with the detecting agent, the detecting agent is:
The primary color changes to a required color corresponding to the volatile component. The extraction of the volatile components is performed by driving the suction pump 25 a plurality of times (for example, about five times) and performing a bubbling operation, thereby feeding a degradation product such as a dissolved gas to the detection tube 20.
If volatile components (aldehydes, ketones) that specifically react with the detection agent (hydrazines) are extracted, the volatile component reacts with only the detection agent and changes color.

The detection agent reacts with the extracted volatile components to produce a color, and the coloration range (the amount of the volatile components generated) is set in the detection tube 20 as shown in FIG. When the color is displayed up to the vicinity of the scale 22, the range in which the color is formed is defined as a color range 22a, and by reading the scale 22 in the range where the color is displayed, the average degree of polymerization of the volatile component is grasped.

That is, an indication scale indicating the position of the color gamut 22a of the detector tube 20 is read, and the read numerical value (detected value, for example, the concentration of the volatile component) is calculated by an average polymerization value (not shown) created in advance. In the conversion table, the average degree of polymerization (concentration in oil) of the volatile component was converted, and the numerical value of the converted average degree of polymerization was converted into the average degree of polymerization and the volatility in oil as shown in FIG. The graph is transcribed to a graph showing the relationship with the component concentration, and the life expectancy of the transformer 1 in which the sample oil is sampled is estimated.

In FIG. 7, the average degree of polymerization of the volatile component is, for example, not more than the life level (average degree of polymerization: 450).
If the concentration of the volatile component is 1.42 ppm or more, the degree of deterioration of the insulating paper of the transformer 1 filled with the insulating oil 4 containing the volatile component is limited to the life (life level). Is determined (diagnosed).

In FIG. 7, if the average degree of polymerization is 250 or less and the concentration of the volatile component is 2.21 ppm or more, the transformer 1 using the measured sample oil can be used continuously. Is difficult (risk level) and judged (diagnosis). The values 450 and 250 of the average degree of polymerization at the limit level and the danger level are set based on JEM1463 "Evaluation criteria for average degree of polymerization of insulating paper for transformers" (Japan Electrical Manufacturers 'Association standard established by the Japan Electrical Manufacturers' Association). It is a numerical value as a standard of each level.

The average degree of polymerization was calculated as follows.
Instead of converting the numerical value of the color gamut appearing in the detection tube 20 into the oil concentration using a conversion table and grasping it, the detection tube 20
The scale 22 itself indicating the color gamut 22a may be provided as a numerical value representing the average degree of polymerization, and the numerical value may be read to detect the average degree of polymerization of the volatile component.
In this case, the scale 22 formed on the detection tube 20 can be read so that the numerical value of the average polymerization degree is, for example, 250 or 450 when the volatile component reaches the coloring range 22a in advance. The relationship between the coloration range and the average degree of polymerization may be verified by a test or the like, and a scale capable of reading the average degree of polymerization may be provided.

Next, a second embodiment of the present invention will be described. In FIG. 6, the second embodiment has two detector tubes 20.
a and 20b are connected to the feed pipe 17 and the electric suction pump 25a.
The upper detection tube 20a is filled with only a detection agent that specifically reacts with a volatile component composed of aldehydes, and the lower detection tube 20b is filled with a volatile component composed of ketones. It is configured by filling only a detection agent that reacts with the gas, and by arranging the detection tubes 20a and 20b in parallel, it is possible to individually confirm the generation amount of volatile components extracted from the insulating oil 4. Become.

That is, among the volatile components, for example, it is possible to compare at a glance whether the production amount of aldehydes or the production amount of ketones is large. Depending on whether the number is small, the deterioration diagnosis of the transformer 1 can be performed with higher accuracy. This is because the average degree of polymerization in the first embodiment is based on the diagnosis of the degree of deterioration of the transformer 1 based on the sum of aldehydes and ketones. Inevitably tends to be loose. However, in the second embodiment, the average degree of polymerization can be calculated by subtracting a small number from a large value of the color gamut to calculate the average degree of polymerization. Thus, it is possible to more reliably perform the deterioration diagnosis.

In the present invention, the suction pump 25
In the first embodiment, the manual operation is described. However, as shown in FIGS. 4 and 6, an electric suction pump 25a may be used, or a cylinder filled with compressed air may be supplied. In the case where a volatile component is extracted by using a compressed air jet force attached to the pipe 16, the suction pump 2 is used.
Of course, the present invention can be realized even when the extraction work is performed without using the 5, 25a. Further, in addition to hydrazines that specifically react with aldehydes and ketones as the colorant, for example, hydroxylamines (such as hydroxylamine phosphate) and amines (such as p-methylaniline) may be used.

[0051]

According to the present invention, when the amount of volatile components formed of aldehydes, ketones, etc. in insulating oil is detected, the amount of the volatile components dissolved in the insulating oil only reacts specifically. The volatile component extracted from the insulating oil is sent to the calibration means packed with the agent, and the volatile component is reacted with the filler to form a color. The average degree of polymerization based on the amount of components produced was measured, and a diagnosis was performed to estimate the deterioration (remaining life) of oil-filled electrical equipment based on the measured values. compared with the case of performing degradation diagnosis using a gas chromatograph to measure high-speed liquid chromatography and CO, and CO ₂ to measure, resulting performs handling operations of devices simply and can remaining life at low cost it can be diagnosed At the convenience That.

When measuring the amount of volatile components such as aldehydes extracted from the insulating oil, extraction means such as a pump for extracting the volatile components from the insulating oil may be used.
By combining with the calibration means for presenting the color gamut of the extracted volatile component, an apparatus for easily diagnosing the remaining life of the oil-filled electric device can be easily configured, which is convenient for carrying. Deterioration diagnosis at the site such as the installation location of electrical equipment can be easily performed.
Degradation diagnosis of oil-filled electrical equipment can be performed quickly, easily, and economically without any need for expensive measuring equipment such as a high-performance liquid chromatograph or a skilled technician.

Further, when detecting the generation amount of the volatile component, the volatile component can be individually detected.
By connecting a plurality of detection pipes between the supply pipe of the dissolved gas and the suction pump and subtracting the minimum value from the maximum value of the generation amount of the volatile component, or calculating the average value of the generation amount, Based on the calculated value, it becomes possible to calculate a reference value for the deterioration diagnosis of the oil-filled electric device due to the volatile component with high accuracy,
Thereby, the accuracy of the remaining life diagnosis of the oil-filled electric device can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of an oil-filled electric device.

FIG. 2 is an explanatory diagram showing a state in which a sample oil is collected.

FIG. 3 is a schematic explanatory view of an apparatus for detecting a degradation product in insulating oil necessary for performing a degradation diagnosis of an oil-filled electric device of the present invention.

FIG. 4 is a schematic explanatory view of an apparatus for detecting a degradation product by changing the extraction driving means in the present invention.

FIG. 5 is a front view of a detection tube.

FIG. 6 is an explanatory view schematically showing a second embodiment of the present invention.

FIG. 7 is a graph showing the relationship between the average degree of polymerization and the concentration of volatile components.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transformer 4 Insulating oil 11 Deterioration diagnosis device 12 Extraction means 13 Calibration means 14 Extraction drive means 15 Oil sampling bottle 16 Inflow pipe 17 Feed pipe 20, 20, a, 20b Detection pipe 25, 25a Suction pump

Claims (4)

[Claims] 1. Extraction of volatile components such as aldehydes and ketones dissolved in insulating oil of oil-filled electric equipment,
The volatile component thus extracted is reacted with a filler that reacts specifically with this volatile component, and the correlation between the coloration value of the coloration region and a predetermined average degree of polymerization that indicates the degree of deterioration of the insulating paper is obtained. A method of diagnosing the deterioration of oil-filled electrical equipment by judging the average degree of polymerization of the insulating paper at the coloration value to diagnose the degree of deterioration of the oil-filled electrical equipment. 2. The filler which specifically reacts with the volatile component comprises hydrazines such as 2,4-dinitrophenylhydrazine and hydroxylamines such as hydroxylamine phosphate. The method for diagnosing deterioration of an oil-filled electrical device described in the above. 3. Extraction means for extracting a volatile component such as a dissolved gas component dissolved in oil from insulating oil, and aldehyde contained in the volatile component in communication with the extraction means.
Calibration means filled with a filler that reacts and develops a color with a volatile component composed of ketones and the like, and extraction drive means connected to the calibration means for extracting volatile components from the insulating oil in the extraction means A degradation diagnostic device for oil-filled electrical equipment comprising: 4. The apparatus for diagnosing deterioration of an oil-filled electrical device according to claim 3, wherein a plurality of calibration means communicating with the extraction means are constructed by connecting a plurality of pipes to the extraction means in parallel. .