JPH05249100A - Deterioration-degree judgment method of electric apparatus filled with synthetic oil - Google Patents

Abstract

PURPOSE:To obtain a deterioration-degree judgment method wherein a local overheating temperature can be judged by analyzing a very small amount of a synthetic oil sample from an electric apparatus as an object to be diagnosed as will as the deterioration degree and the remaining life of a main material can be judged. CONSTITUTION:A synthetic oil as a specimen is sample from an electric apparatus which is filled with the synthetic oil; a prescribed low-molecular-weight component in the synthetic oil as the specimen is analyzed quantitatively; the concentration ratio of each low-molecular-weight component to a specific low-molecular-weight component is found from an alalytical result which has been obtained. The concentration ratio is collated with a judgment curve which has been found in advance with reference to the synthetic oil of the same kind; a temperature in a heat-generating part at the inside of the electric apparatus is judged. When the synthetic oil is a silicone oil, only 3D out of low-molecular-weight components 3D, 4D, 5D, 6D displays a saturation characteristic. As a result, when the 3D is regarded as the specific low-molecular- weight component and the concentration ratio is found, a judgment curve having a pattern which is peculiar to the silicone oil can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining the degree of deterioration of a synthetic oil-containing electric device in which a synthetic oil such as silicone oil is used as an insulating medium which also serves as a cooling medium. The present invention relates to a method for determining the degree of deterioration due to an abnormal phenomenon such as local overheating or partial discharge by sampling a small amount of synthetic oil from the oil and quantitatively analyzing a low molecular weight component generated by heat deterioration.

[0002]

2. Description of the Related Art Synthetic oils that can be used as insulating oil that also serves as a cooling medium for electric equipment include silicone oil,
Alkylnaphthalene composed of hydrocarbon, diallylethane, phosphoric acid ester having ester bond, carboxylic acid ester, and fluorine oil which is a halogen compound are known. In particular, silicone oil has higher heat resistance than mineral oil, Because of its excellent flame retardancy, it is used in place of mineral oil-based insulating oil in vehicle transformers that require high operating temperatures and high reliability, especially for weight reduction. In these oil-filled electrical devices, thermal deterioration gradually progresses even at operating temperature,
If an abnormal situation such as local overheating or partial discharge occurs inside the equipment, the synthetic oil and the organic insulating material will deteriorate rapidly, which may eventually lead to an insulation accident.
The establishment of preventive maintenance technology that can detect the occurrence of these abnormal situations early and prevent insulation accidents is required.

As a preventive maintenance technology, in the case of mineral oil-containing electrical equipment using mineral oil whose molecular structure is not clear, dissolved gas in a mineral oil sample collected from the equipment to be diagnosed is extracted and its components and production amount are analyzed. A non-destructive method for determining the degree of deterioration that detects the occurrence of an abnormal situation such as local overheating or partial discharge inside the equipment from the gas generation pattern, components, and amount of gas generation by repeating the operation periodically. It is already known as a diagnostic technique for. However, the degree of abnormality and the remaining life of the device have not yet been determined.

On the other hand, as a method for determining the degree of deterioration of electric equipment containing synthetic oil, the phenomenon of lowering the flash point and the phenomenon of increasing the evaporation amount or increasing the amount of low molecular weight components appear with the thermal deterioration of the synthetic oil. Is known, and as a method of determining the degree of deterioration utilizing this phenomenon, a synthetic oil sample obtained by collecting a small amount of a synthetic oil with a clear molecular structure, for example, a synthetic oil containing a silicone oil, from a device to be diagnosed. There are known methods for measuring the amount of evaporation of water, and for measuring the total amount of low molecular weight components produced.

FIG. 5 is a characteristic diagram showing the relationship between the flash point and the evaporation amount due to the thermal deterioration of silicone oil, and the forced heating deterioration of polydimethylsiloxane (viscosity 50 cst at 25 ° C.) as silicone oil. It shows the correlation between the flash point and the evaporation amount obtained by changing the processing conditions, and the evaporation amount is 1%.
If it exceeds, the flash point tends to decrease sharply.
Therefore, after heating a small amount of silicone oil sample collected from the equipment to be diagnosed at 150 ° C for 24 hours, the amount of evaporation of the sample oil is measured, and the degree of deterioration of the equipment to be diagnosed is determined using the evaporation amount of 1% as a control value. It is known how to do it.

FIG. 6 is a characteristic diagram showing the relationship between the evaporation loss due to the heat deterioration of polydimethylsiloxane and the concentration of the produced low molecular weight component. The low molecular weight compound hexamethylcyclotril produced due to the heat deterioration of polydimethylsiloxane. There is a linear relationship between the total amount of siloxane compound (3D), octamethylcyclotetrasiloxane compound (4D), decamethylcyclopentasiloxane compound (5D), and dodecamethylcyclohexasiloxane compound (6D) produced and the amount of evaporation. There is a proportional relationship, indicating that the concentration of the low molecular weight component corresponding to the evaporation amount of 1% is 0.75%.
Therefore, a low molecular weight component in the silicone oil sample collected in a small amount from the equipment to be diagnosed was quantitatively analyzed using gas chromatography, and the control value of the total amount of the low molecular weight component was 0.75%.
There is known a method for determining the degree of deterioration of a device to be diagnosed (see Japanese Patent Publication No. 61-31824).

[0007]

Generally, a synthetic oil-containing electric device using a synthetic oil such as silicone oil having excellent heat resistance and flame retardancy as an insulating medium also serving as a cooling medium In many cases, deterioration due to an abnormal situation such as local overheating or partial discharge inside the equipment is the dominant factor rather than deterioration due to a steady temperature rise. Is desired. However, synthetic oil deteriorated due to a local abnormal phenomenon diffuses and is diluted throughout the oil inside the equipment due to convection or circulation of the oil, and the amount of evaporation or low molecular weight in the synthetic oil sample collected from the equipment is reduced. The conventional method of determining the degree of deterioration, which measures the total amount of the component concentration, has the drawback that the change in the detected amount is small and the occurrence of a local abnormal phenomenon cannot be detected early with high sensitivity. In addition, in the conventional deterioration degree determination method of measuring the evaporation amount, it takes 24 hours to perform the heat treatment for measuring the evaporation loss, and the work man-hours increase because the weighing is performed many times. Since a synthetic oil sample is taken every time periodical measurement is performed, there is a drawback in that a device with a small amount of synthetic oil needs to be replenished with insufficient synthetic oil.

An object of the present invention is to collect a minute amount of synthetic oil from an electric device to be diagnosed and analyze it to accurately determine the local overheating temperature, and further to determine the degree of deterioration of the main material and the remaining life. It is to get the degree judgment method.

[0009]

In order to solve the above-mentioned problems, according to the present invention, a synthetic oil sample is taken from an electric instrument containing synthetic oil, and a predetermined low molecular weight component in the synthetic oil sample is analyzed by an analytical instrument. Was quantitatively analyzed, the concentration ratio of each low molecular weight component to the specific low molecular weight component was obtained from the obtained analysis result, and the concentration ratio and cumulative heating time were compared with the determination curve previously obtained for the same kind of synthetic oil, The temperature of the heat generating portion inside the electric device is determined.

Further, in the above-mentioned deterioration degree judging method, a judgment key
Is prepared based on the concentration ratio data of the low molecular weight components obtained for the deteriorated oil that is forcibly deteriorated by changing the heating temperature and the heating time of the synthetic oil of the same kind as the synthetic oil in the electric equipment containing the synthetic oil. It is supposed to be Further, when the synthetic oil sample is a silicone oil in the above-mentioned deterioration degree judging method, the predetermined low molecular weight component is hexamethylcyclotrisiloxane compound (3D), octamethylcyclotetrasiloxane compound (4D), decamethylcyclosiloxane. At least two or more of the pentasiloxane compound (5D) and the dodecamethylcyclohexasiloxane compound (6D) are included.

Further, in each of the above-mentioned deterioration degree judging methods,
The hexamethylcyclotrisiloxane compound (3D) is used as the specific low molecular weight component, and the concentration ratio of the other low molecular weight components is determined based on the concentration thereof. Furthermore, a synthetic oil sample is periodically taken from an electric device containing synthetic oil, and a predetermined low molecular weight component in each synthetic oil sample is quantitatively analyzed by an analysis device to obtain a concentration ratio. The point of sudden increase is determined and used as the starting point, and the elapsed time from this point is taken as the cumulative overheating time.

On the other hand, a synthetic oil sample is periodically taken from an electric device containing synthetic oil, and a predetermined low molecular weight component in each synthetic oil sample is quantitatively analyzed by an analytical device, and a specific low molecular weight is obtained from the obtained analysis result. The concentration ratio of each low molecular weight component to the component is determined, and the concentration ratio and the cumulative heating time are compared with the determination curve previously determined for the same type of synthetic oil to determine the temperature of the heat-generating part inside the electric device, Cumulative heating time is calculated from the point of time when the judgment temperature suddenly increases, and the obtained judgment temperature and cumulative heating time are compared with the heat deterioration judgment curve previously determined for the specific constituent material inside the synthetic oil-filled electric device. The degree of deterioration of incoming electrical equipment shall be determined.

Further, in the above-mentioned deterioration degree judging method, the heat deterioration judging curve is a deteriorated sample forcibly deteriorated by changing the heating temperature and the heating time of the organic insulating material of the same kind as the organic insulating material in the electric equipment containing synthetic oil. Is a life curve obtained by plotting predetermined characteristic deterioration rate data for Arrhenius plot, and the difference between the life time obtained by comparing the judgment temperature with this life curve and the cumulative heating time is taken as the remaining life. To do.

Further, in the characteristic deterioration curve obtained by the heat deterioration judgment curve, the deterioration sample is forcibly deteriorated with the heating temperature of the organic insulation material of the same kind as the organic insulation material in the electric equipment containing synthetic oil as the judgment temperature. Therefore, the ratio of the characteristic value obtained by comparing the characteristic deterioration curve with the cumulative heating time and the initial value of the characteristic is taken as the deterioration degree of the organic insulating material.

[0015]

In the configuration of the present invention, a synthetic oil sample is taken from an electric device containing synthetic oil, and a predetermined low molecular weight component in the synthetic oil sample is quantitatively analyzed by an analyzer, and a specific low molecular weight component is obtained from the obtained analysis result. The concentration ratio of each low-molecular-weight component is calculated, and the concentration ratio and cumulative overheating time are compared with the determination curve previously obtained for the same type of synthetic oil to determine the degree of deterioration to determine the temperature of the heat-generating part inside the electrical equipment. By configuring the method, for example, even if the low molecular weight component produced in the local heating section is diluted by convection or circulation, the concentration ratio of each low molecular weight component to the specific low molecular weight component does not change. By collating with the determination curve obtained for oil, the function of detecting the temperature of the heat generating portion inside the electric device can be obtained.

Further, in the above-mentioned deterioration degree judging method, the judgment curve was obtained for the deteriorated oil which was forcibly deteriorated by changing the heating temperature and the heating time of the synthetic oil of the same kind as the synthetic oil in the electric equipment containing the synthetic oil. If created based on the concentration ratio data of low molecular weight components, a function to accurately detect the concentration ratio of low molecular weight components that differ depending on the molecular structure of the synthetic oil used, and to accurately detect the temperature of the heat generating part inside the electrical equipment. Is obtained.

Further, when the synthetic oil sample is silicone oil in the above-mentioned deterioration degree judging method, the predetermined low molecular weight component is the hexamethylcyclotrisiloxane compound (3
D), octamethylcyclotetrasiloxane compound (4
D), decamethylcyclopentasiloxane compound (5
D) and at least two or more of the dodecamethylcyclohexasiloxane compound (6D), preferably the hexamethylcyclotrisiloxane compound (3D), is used as the specific low molecular weight component, and based on the concentration thereof with other low molecular weight components. By obtaining the concentration ratio, it is possible to obtain a temperature determination curve having a concentration ratio characteristic pattern unique to the silicone oil with respect to the temperature of the locally overheated portion and the accumulated overheating time. The function of accurately detecting the temperature of the heat generating portion inside the electric device can be obtained by using the knob.

Furthermore, synthetic oil samples are periodically taken from electrical equipment containing synthetic oil, and predetermined low molecular weight components in each synthetic oil sample are quantitatively analyzed by an analytical equipment to obtain concentration ratios, and the obtained concentration If the point at which the ratio increases rapidly is determined as the starting point, and the elapsed time from this point is the cumulative overheating time,
Frequent regular monitoring enables highly accurate detection of the overheating temperature, and only 1
Low-molecular-weight components can be measured easily and in a short time using a gas chromatograph by collecting μl, so the amount of synthetic oil required for frequent regular monitoring can be small, and measurement work can be performed. The function to simplify is obtained.

On the other hand, the judgment temperature and the cumulative heating time obtained in each of the above-mentioned examples are compared with the heat deterioration judgment curve obtained beforehand for the specific constituent material inside the electric oil-filled electric device, and the electric oil-filled electric device If configured to determine the degree of deterioration, the thermal deterioration determination curve is, for example, a deteriorated sample that is forcibly deteriorated by changing the heating temperature and the heating time of the organic insulating material of the same kind as the organic insulating material in the electrical equipment containing synthetic oil. Assuming that the life curve obtained by Arenius plotting the predetermined characteristic deterioration rate data is, the difference between the life time obtained by comparing the judgment temperature with this life curve and the cumulative heating time is The deterioration degree of the device can be easily estimated as the remaining life of the organic insulating material in the locally overheated part. Further, if the thermal deterioration determination curve is a characteristic deterioration curve obtained for a deteriorated sample forcibly deteriorated with the heating temperature of the organic insulating material of the same kind as the organic insulating material in the electric equipment containing synthetic oil as the determination temperature, The degree of deterioration of the organic insulating material can be easily determined from the ratio of the characteristic value obtained by comparing the characteristic deterioration curve with the cumulative heating time and the initial value of the characteristic.

[0020]

EXAMPLES The present invention will be described below based on examples. When the synthetic oil-containing electric device is, for example, a vehicle oil-containing transformer, silicone oil is generally used as the synthetic oil as an insulating medium that also serves as a cooling medium. As this silicone oil, polydimethylsiloxane (viscosity 50 cst at 25 ° C.) is often used. Therefore, first, a method for creating a temperature determination curve that should be prepared in advance for carrying out this deterioration degree determination method will be described.

FIG. 1 shows polydimethylsiloxane at 300 °
FIG. 2 shows an example of a temperature determination curve in the method for determining the degree of deterioration of the electrical equipment containing synthetic oil according to an embodiment of the present invention. It is a characteristic diagram. Figure 1 shows that 1 µl of sample oil was sampled from polydimethylsiloxane continuously heated at 300 ° C at regular intervals, and low molecular weight components were quantitatively analyzed using gas chromatography. It is a characteristic diagram obtained by plotting on a logarithmic log graph having the cumulative overheating time as the horizontal axis. When polydimethylsiloxane (viscosity 50 cst at 25 ° C.) is heated and deteriorated, hexamethylcyclotrisiloxane compound (3D), octamethylcyclotetrasiloxane compound (4D), deca is generated at the initial stage of deterioration due to cleavage of the main chain from the terminal. A low molecular weight compound called a ring polymer such as a methylcyclopentasiloxane compound (5D) and a dodecamethylcyclohexasiloxane compound (6D) is mainly produced. As is clear from the figure, 3D, which is the main component of the low molecular weight compound, is an unstable substance at first, so it changes into more stable substances 4D, 5D, and 6D with the elapse of heating time. As a result, only 3D exhibits a saturation characteristic in which the concentration does not increase even if the concentration is increased to 1% as an upper limit and further heated.

Therefore, if the component concentration ratio with other low molecular weight components 4D, 5D and 6D is obtained by using 3D having a saturation characteristic as a specific low molecular weight component, the obtained component concentration ratio is a function of the superheat temperature and the superheat time. Since it has a characteristic pattern unique to polydimethylsiloxane, it can be used as a temperature determination curve for determining the local heating temperature in the present invention. FIG. 2 is a temperature determination curve in which a characteristic diagram similar to that shown in FIG. 1 is obtained corresponding to a plurality of different heating temperatures, and a component concentration ratio 3D / 5D is obtained from a large number of obtained data. Yes, component concentration ratio 3D / 4D, 3
A temperature determination curve can be similarly created for D / 6D.

Next, the procedure of the deterioration degree determining method according to the embodiment will be described. First, about 1 μl of polydimethylsiloxane (viscosity of 50 cst at 25 ° c) as a sample of silicone oil was sampled from the equipment to be diagnosed, and the concentration of low molecular weight compounds in the sample of silicone oil was quantitatively analyzed using gas chromatography. To do. From the obtained low molecular weight compound concentration data, for example, a component concentration ratio of 3D / 5D is obtained and collated with the temperature determination curve shown in FIG. At this time, if there is no abnormal phenomenon such as local overheating or partial discharge inside the equipment to be diagnosed, the component concentration ratio shows about 6.3 (upper limit value) and the operating temperature is much lower than 200 ° C. If so, even if the silicone oil sample is periodically collected and the above-mentioned diagnosis is repeated, the ratio of the component concentration to the cumulative overheating time from the first diagnosis does not decrease much, which means that there is no abnormality in the equipment to be diagnosed. Can be detected.

On the other hand, when the equipment under diagnosis is accompanied by an abnormal temperature rise exceeding 200 ° C. due to an overload operation or the like during operation, the total value of the overload times is taken as the cumulative overheat time, and the obtained component is obtained. By comparing the concentration ratio with the temperature determination curve corresponding to the cumulative overheating time, the temperature rise value due to overload operation can be determined. That is, assuming that the cumulative overheating time t _A is 250 hours and the obtained component concentration ratio 3D / 5D is about 3.2, the temperature judgment curve of FIG. The abnormal temperature increase value T _A can be determined to be 250 ° c.

Further, when the component concentration ratio or the component concentration value changes abruptly in the periodic diagnosis, the local overheat temperature can be estimated by determining the time corresponding to half of the diagnosis cycle as the cumulative overheat time, A more accurate superheat temperature can be obtained by shortening the diagnostic cycle to obtain the concentration ratio, and determining the local superheat temperature by using the elapsed time from the sudden change in the component concentration ratio as the cumulative heating time.

Next, a method of judging the degree of deterioration of the main constituent materials inside the equipment from the judgment value of the local overheating temperature will be described. FIG. 3 is a characteristic diagram showing a deterioration degree determining curve in a deterioration degree determining method for an electric device containing synthetic oil according to another embodiment of the present invention. If the constituent material that affects the heat-resistant life of the equipment to be diagnosed is an organic insulating material, this organic insulating material is subjected to forced overheating deterioration by changing the overheating temperature and overheating time in silicone oil, and its mechanical characteristics or electrical characteristics Heat resistance obtained by measuring insulation characteristics and plotting the time and temperature at which the characteristic value drops by a prescribed level from the initial value on a graph in which the horizontal axis and the vertical axis represent the logarithm of time and the reciprocal of absolute temperature. It is already known that a life curve (called an Arrhenius plot curve) can be approximated by a straight line, and by comparing this heat resistance life curve with a judgment temperature as a deterioration degree judgment curve,
It is possible to determine the degree of deterioration (remaining life) of the organic insulating material at the determination temperature.

FIG. 3 is a deterioration determination curve obtained for an aromatic polyamide paper (trade name Nomex) used as a covering material for a winding conductor of a silicone oil-filled transformer for a vehicle. When the judgment temperature of the collected silicone oil sample is T _A ° c, the life time t
You can ask for _b . Therefore, if the accumulated overheating time at the determination temperature T _A is t _a , the life time t _b
The difference t _b -t _a between the cumulative heating time is the remaining life time of the winding insulation covering material, since the remaining life diagnosis target device is obtained, in advance of the insulation fault of the equipment by performing periodic diagnosis In addition to being able to prevent it, it is possible to plan the time for repairing or renewing the equipment early.

FIG. 4 shows a synthetic oil according to another embodiment of the present invention.
Deterioration degree determination method for determining the degree of deterioration of electrical equipment
Indicates the judgment temperature T_AAromatic polyamide at ° c
It is a characteristic diagram showing the relationship between the mechanical strength of the paper and the heating time.
It In the figure, the cumulative heating time t_aThis deterioration judgment card
The judgment temperature T_A， Cumulative heating time
t_aMechanical strength N corresponding to_taCan be asked.
Therefore, the initial value of mechanical strength N₀And mechanical strength
Fixed value N_taDetermining the degree of deterioration of aromatic polyamide paper from the ratio
The lower limit value N of the mechanical strength that is possible and acceptable_txTo
If set in advance as a control value, the control value N_txTo
Corresponding life time t_xAnd cumulative heating time t _aSeen from the difference
The remaining life of the disconnection target device can be obtained.

Although the above-described embodiments have been described with respect to the case of the electric equipment containing the synthetic oil using the silicone oil, the deterioration degree judging method of the electric equipment containing the synthetic oil using other synthetic oil is also applicable. This can be easily carried out by preparing the judgment curves corresponding to FIGS. 2, 3 or 4 for different synthetic oils and organic insulating materials in advance.

[0030]

As described above, according to the present invention, a synthetic oil sample is taken from an electric instrument containing synthetic oil, and a predetermined low molecular weight component in the synthetic oil sample is quantitatively analyzed by an analytical instrument. The concentration ratio of each low molecular weight component to the specific low molecular weight component is obtained, and the concentration ratio and cumulative heating time are compared with the determination curve obtained in advance for the same type of synthetic oil to determine the temperature of the heat generating part inside the electric device. Thus, the deterioration degree determination method is configured. As a result, for example, even if the low molecular weight component produced in the local superheated portion is diluted by convection or circulation, the concentration ratio of each low molecular weight component to the specific low molecular weight component does not change, so this was obtained in advance for the same kind of synthetic oil. By comparing with the judgment curve, it becomes possible to detect the temperature of the exothermic part inside the equipment to be diagnosed, and to measure the total evaporation amount or low molecular weight component concentration in the synthetic oil sample collected from the equipment. The synthetic oil deteriorated in the local abnormal phenomenon part, which was a problem in the deterioration degree judgment method, is diffused and diluted throughout the oil inside the equipment by convection or circulation of the oil, and the change in the detected amount is small, The electric oil-filled electrical equipment that eliminates the disadvantage of not being able to detect the occurrence of a local abnormal phenomenon with high sensitivity and early, and can accurately and early determine the temperature of the local overheating part It is possible to provide a deterioration degree determination process.

Further, since a small amount of synthetic oil sample of about 1 μl is sampled from the device to be diagnosed and the low molecular weight component produced can be analyzed easily and in a short time, there is a problem with the conventional deterioration degree determination method for measuring the evaporation amount. This reduces the evaporation loss measurement time, eliminates the need for weighing work, and requires only a very small amount of oil to be collected, so even equipment with a small amount of synthetic oil can be diagnosed regularly without replenishing synthetic oil. It can be carried out.

Furthermore, if a heat deterioration judging curve for the main constituent materials is prepared in advance, the deterioration of the main constituent materials at the site where the local abnormal phenomenon occurs can be confirmed by comparing with the judgment temperature and the cumulative heating time. Since it is possible to provide a method for determining the degree of deterioration of a synthetic oil-filled electric device that can judge the degree of deterioration and the remaining life, it is possible to detect a local abnormal phenomenon early and prevent an insulation accident resulting from this, and The preventive maintenance effect that systematically repairs and updates can be obtained.

[Brief description of drawings]

FIG. 1 is a characteristic diagram showing changes over time in the concentration of low-molecular compounds when polydimethylsiloxane is deteriorated by heating at 300 ° C.

FIG. 2 is a characteristic diagram showing an example of a temperature determination curve in the method for determining the degree of deterioration of electric equipment containing synthetic oil according to an embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a deterioration degree determining curve in a deterioration degree determining method for an electric device containing synthetic oil according to another embodiment of the present invention.

FIG. 4 is a characteristic diagram showing a deterioration degree determining curve in a deterioration degree determining method for an electric device containing synthetic oil according to another embodiment of the present invention.

FIG. 5 is a characteristic diagram showing the relationship between the flash point and the evaporation amount due to the thermal deterioration of silicone oil.

FIG. 6 is a characteristic diagram showing the relationship between the evaporation loss due to heat deterioration of polydimethylsiloxane and the concentration of the produced low molecular weight component.

[Explanation of symbols]

3D hexamethylcyclotrisiloxane compound 4D octamethylcyclotetrasiloxane compound 5D decamethylcyclopentasiloxane compound 6D dodecamethylcyclohexasiloxane Compound T _A determination temperature t _a cumulative heating time t _b lifetime N _ta mechanical strength initial value of ( Main constituent materials) _Nta- determined mechanical strength (main constituent materials) N _tx Mechanical strength control value (main constituent materials)

Claims (8)

[Claims] 1. A synthetic oil sample is taken from an electric instrument containing synthetic oil, and a predetermined low molecular weight component in the synthetic oil sample is quantitatively analyzed by an analytical instrument. The concentration ratio of the molecular weight component is obtained, and the concentration ratio and the cumulative heating time are collated with a determination curve obtained in advance for the same type of synthetic oil to determine the temperature of the heat generating portion inside the electric device. Deterioration determination method for oil-filled electrical equipment. 2. A concentration ratio of a low molecular weight component obtained for a deteriorated oil whose judgment curve is forcibly deteriorated by changing the heating temperature and the heating time of the synthetic oil of the same kind as the synthetic oil in the electric equipment containing the synthetic oil. The deterioration degree determining method for an electric device containing synthetic oil according to claim 1, wherein the deterioration degree determining method is based on data. 3. When the synthetic oil sample is silicone oil, the predetermined low molecular weight component is hexamethylcyclotrisiloxane compound (3D), octamethylcyclotetrasiloxane compound (4D), decamethylcyclopentasiloxane compound. (5D), and at least 2 or more of a dodecamethyl cyclohexasiloxane compound (6D) are contained, The deterioration degree determination method of the electrical equipment containing synthetic oil of Claim 1 or Claim 2 characterized by the above-mentioned. 4. The synthetic oil according to claim 3, wherein the hexamethylcyclotrisiloxane compound (3D) is used as a specific low molecular weight component, and the concentration ratio with other low molecular weight components is determined based on the concentration thereof. Deterioration determination method for electrical equipment. 5. A synthetic oil sample is periodically taken from an electric device containing synthetic oil, and a predetermined low molecular weight component in each synthetic oil sample is quantitatively analyzed by an analytical device to obtain a concentration ratio, and the obtained concentration is obtained. 2. The method for determining the degree of deterioration of a synthetic oil-filled electric device according to claim 1, wherein a point at which the ratio rapidly increases is determined as a starting point, and an elapsed time from this point is set as a cumulative heating time. 6. A synthetic oil sample is taken from an electric device containing synthetic oil, and a predetermined low molecular weight component in the synthetic oil sample is quantitatively analyzed by an analytical device. The concentration ratio of the molecular weight component is obtained, and the concentration ratio and the cumulative heating time are collated with the determination curve previously obtained for the same type of synthetic oil to determine the temperature of the heat-generating part inside the electric device and the obtained determination. Synthetic oil characterized in that the degree of deterioration of the electric device containing synthetic oil is judged by comparing the temperature and the cumulative heating time with a thermal deterioration judging curve obtained in advance for a specific constituent material inside the electric device containing the synthetic oil. Deterioration degree determination method for enclosed electrical equipment. 7. A predetermined deterioration rate of characteristics of a deteriorated sample in which a heat deterioration judging curve is forcibly deteriorated by changing a heating temperature and a heating time of an organic insulating material of the same kind as an organic insulating material in electric equipment containing synthetic oil. 7. A life curve obtained by Arrhenius plot of data, wherein the difference between the life time obtained by matching the judgment temperature with this life curve and the cumulative heating time is taken as the remaining life. A method for determining the degree of deterioration of an electric device containing synthetic oil as described. 8. A characteristic deterioration curve obtained for a deteriorated sample in which a heat deterioration judging curve is forcibly deteriorated by using a heating temperature of an organic insulating material of the same kind as an organic insulating material in an electric device containing synthetic oil as a judgment temperature. 7. The synthetic oil according to claim 6, wherein a ratio of a characteristic value obtained by collating the characteristic deterioration curve with the cumulative heating time and an initial value of the characteristic is used as the degree of deterioration of the organic insulating material. Deterioration degree determination method for enclosed electrical equipment.