CN115825614A - Transformer aging diagnosis method based on insulating oil color development technology - Google Patents
Transformer aging diagnosis method based on insulating oil color development technology Download PDFInfo
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Abstract
The invention relates to a diagnosis method for transformer aging based on insulating oil color development technology, which comprises the following steps: s1: carrying out oil-paper insulation acceleration thermal aging test by adopting transformer insulating oil and common kraft insulating paper, and selecting different aging times for sampling to obtain oil-paper insulation combinations with different aging degrees; s2: and carrying out color development observation on the insulating oil with different aging degrees in excitation light sources with different wavelengths, acquiring color development images of the insulating oil with different aging degrees under the luminescence of the excitation light sources, and establishing a data model of the aging time of the insulating oil corresponding to RGB three-color numerical values, thereby monitoring and diagnosing the aging state of the transformer. The aging degree of the transformer is visually reflected by using the change of the self color rendering characteristic of the insulating oil in the aging process, and the defects that the field application is limited, the influence factors are numerous or the loss is caused by the operations of oil changing, oil filtering and the like of the transformer exists in different degrees of the current main physical and chemical characteristic quantity and the electrical characteristic quantity are overcome.
Description
Technical Field
The invention belongs to the technical field of insulating materials, and particularly relates to a diagnosis method for transformer aging based on insulating oil color development technology.
Background
The power transformer is core equipment of a power system, is linked with power generation, power transmission and power distribution links in the power system, determines the safe reliability of a power grid in safe and stable operation, and has important significance for maintaining the stability of power supply of the power grid and the economy of investment of power equipment. At present, more transformers in China have more than 20 years of operation, and some transformers have even more than 30 years of operation, and the probability of causing transformer faults is greatly increased due to the fact that the transformers are aged day by day. Therefore, the aging degree of the transformer is accurately evaluated, the residual service life of the transformer is predicted, and the method has very important significance for operation and maintenance, overhaul, retirement and the like of the transformer.
In chinese patent document CN110031443A, a portable oil paper insulation aging state raman spectrum diagnosis device and method are disclosed, which belong to the field of electrical equipment insulation online monitoring and fault diagnosis. The problems that the existing oil paper insulation aging state diagnosis needs various devices, the detection procedure is complex, in-situ detection in oil cannot be realized and the like are solved. The technical scheme of the invention is that Raman spectrograms of the oil paper insulation samples in different aging states are obtained on the basis of different Raman signals generated during laser irradiation, oil paper insulation Raman fingerprint databases in different aging states are established, and the aging state of the oil paper insulation sample corresponding to the nearest Raman spectrogram in the database is used as a diagnosis result to be output. In the technical scheme, a large amount of samples are required for accumulation when the oil paper insulation Raman fingerprint database is established, and although the method is effective, a large amount of time cost is consumed; and when actual sampling is compared, the environmental conditions during actual sampling cannot be completely guaranteed to be completely the same as the sampling conditions of the aged samples corresponding to the database, which can cause the reliability of judgment to be reduced.
Chinese patent document CN114018885A discloses a method for monitoring the aging degree of transformer insulating oil, which belongs to the technical field of monitoring the aging degree of transformers of power equipment devices, and the technical scheme of the invention comprises the steps of measuring three-dimensional fluorescence of the transformer insulating oil with different aging degrees and constructing a transformer insulating oil aging degree model; and judging the aging degree of the transformer insulating oil according to the aging degree model of the transformer insulating oil. The invention can indicate whether the equipment has fault hidden danger information through early and real-time diagnosis results, thereby effectively monitoring the insulating oil insulating performance state of the transformer, improving the real-time performance of detection, avoiding equipment accidents, reducing heavy loss, improving the reliability of equipment operation and finally ensuring the operation safety of a power system. However, the invention only remains in the analysis of fluorescence intensity spectra, and the method is effective but not intuitive enough. If the data information of the spectrum can be directly expressed through simple color information, the correlation between the color rendering characteristic and the aging degree can be more clearly and intuitively reflected through color conversion, and the method is more clear, simple and convenient.
The oil-immersed power transformer is one of the core components of a power system, and the oil paper insulation is the most important mode of the oil-immersed transformer internal insulation, so that the service life of the transformer is determined to a great extent. The existing on-line monitoring means for the operation life of the transformer depends on the characteristic quantities of polymerization degree, furfural, carbon and oxygen in oil and the like, and has the defects of power failure operation, insensitive medium-term before aging and easy loss. Therefore, the rapid, sensitive and nondestructive method is provided, and the aging state evaluation of the oil paper insulation system of the transformer is significant to the safe operation of the transformer. The main components of the vegetable insulating oil are unsaturated fatty acid, linoleic acid and the like, the vegetable insulating oil can generate fatty acid and grease in the aging process, and the substances contain a large number of electron-donating groups such as hydroxyl, alkoxy and the like and generate similar color reaction with the mineral insulating oil after being irradiated by a light source. Aromatic hydrocarbons in the insulating oil endow the insulating oil with unique color development characteristics, and feasibility is provided for the application of a color development technology in online monitoring of transformers. Zhao Yue discloses a method for monitoring transformer insulating oil aging degree, which belongs to the technical field of monitoring transformer aging degree of power equipment devices and solves the problem of how to establish a transformer fault diagnosis model according to fluorescent characteristics of transformer insulating oil after aging to judge the discharge breakdown quantity or oxidation degree of a transformer, but only the method is effective but not visual enough for analyzing photoluminescence spectra.
Disclosure of Invention
The invention aims to provide a diagnostic method for transformer aging based on insulating oil color development technology, which utilizes the change of self color development characteristic of insulating oil in the aging process to combine with RGB three-color numerical value to visually reflect the aging degree of a transformer, namely, the data information of a spectrum is directly expressed by simple color information, so that the correlation between the color development characteristic and the aging degree can be more clearly reflected by color conversion, and the diagnostic method is clearer, simpler and more convenient; the problems that the field application is limited, the influence factors are numerous or the loss is caused by operations such as oil changing and oil filtering of the transformer in the current main physical and chemical characteristic quantity and electrical characteristic quantity in different degrees are solved.
In order to solve the technical problems, the invention adopts the technical scheme that the diagnosis method of the transformer aging based on the insulating oil color development technology specifically comprises the following steps:
s1: adopting transformer insulating oil and common kraft insulating paper to carry out an oil-paper insulation accelerated thermal aging test to simulate the thermal aging process of oil-paper insulation in a transformer, and selecting different aging times to sample so as to obtain oil-paper insulation combinations with different aging degrees;
s2: and carrying out color development observation on the insulating oil with different aging degrees in excitation light sources with different wavelengths, acquiring color development images of the insulating oil with different aging degrees under the luminescence of the excitation light sources, and establishing a data model of the aging time of the insulating oil corresponding to RGB three-color numerical values, thereby monitoring and diagnosing the aging state of the transformer.
By adopting the technical scheme, the mineral insulating oil is taken as a test object, the transformer insulating oil has the advantages of rapidness, no damage, sensitivity, convenience and the like, and is not easily influenced by oil filtering or oil changing operation of a transformer, the transformer insulating oil has a conjugated system of polycyclic aromatic hydrocarbon, the structure ensures that the transformer insulating oil absorbs energy after being irradiated by a light source, electrons realize energy level transition, and then high-energy electrons lose activity to emit photons, so that lights with different properties are displayed, and once the light source is removed, a color development light beam is annihilated very quickly. The main components of the vegetable insulating oil are unsaturated fatty acid, linoleic acid and the like, the vegetable insulating oil can generate fatty acid and grease in the aging process, and the substances contain a large number of electron-donating groups such as hydroxyl, alkoxy and the like and generate similar color reaction with the mineral insulating oil after being irradiated by a light source. The aging degree of the transformer is visually reflected by using the change of the self color rendering characteristic of the insulating oil in the aging process, the defects that the field application is limited, the influence factors are numerous or the loss is caused by the operations of oil changing, oil filtering and the like of the transformer in different degrees of the current main physical and chemical characteristic quantity and the electrical characteristic quantity are overcome, and a new thought and a feasible method are provided for the aging evaluation of the transformer.
As a preferred technical solution of the present invention, the step S1 specifically comprises the following steps: selecting 120-130 ℃ as a thermal aging temperature to carry out an accelerated thermal aging test; the sampling time of the vegetable insulating oil is set to be 0-90 days, and the sampling time of the mineral insulating oil is set to be 0-60 days.
As a preferred technical solution of the present invention, the step S2 specifically comprises the steps of:
s21: firstly, performing color development observation on the insulating oil obtained with the selected sampling time of 0 to obtain a color development image of the insulating oil, and transmitting data into a data processing system to perform processing and recording of the color development image;
s22: putting the insulating oil with different aging degrees obtained at other sampling time selected in the step S1 into a color development characteristic observation platform for color development observation to obtain color development images of the insulating oil with different aging degrees, and transmitting data into a data processing system for processing and recording the color development images;
s23: changing the excitation light source, and repeating the steps S21-S22 to obtain color development images of the insulating oil with different aging degrees under different excitation light sources;
s24: RGB three-color numerical values corresponding to the insulation oil color development colors with different aging degrees are obtained through color development image software processing, and a data model of the insulation oil aging time corresponding to the RGB three-color numerical values is established.
By adopting the technical scheme, the same type of insulating oil shows different color development characteristics under the irradiation of different exciting lights, when the insulating oil is not aged, the insulating oil is excited by three lights of ultraviolet, blue and green, and the color development characteristics of the insulating oil belong to the blue, green and yellow ranges respectively. The color development intensity of the insulating oil with different aging degrees is gradually reduced along with the aging degree deepening, the color development characteristic is shifted to the long wave direction, and the color development color of the mineral insulating oil is changed into green, yellow and orange under the excitation of ultraviolet light, blue light and green light. The color development of the vegetable insulating oil is changed into blue-green, yellow-orange and orange-red. The developed color is converted into RGB three-color numerical values after being processed by an RGB three-color detector, and the mineral insulating oil corresponds to the color ranges of green (0, 255,0), yellow (255, 255,0) and orange (255, 15,0); the vegetable insulating oil corresponds to the color ranges of cyan (0, 255, 255), yellow orange (255, 215,0) and orange red (255, 69,0); therefore, RGB three-color values corresponding to the developed colors of the insulating oil are selected as aging characteristic quantities, and the aging degree difference of the insulating oil is reflected visually, so that the method is used as a new evaluation method for transformer aging diagnosis.
As a preferred technical solution of the present invention, the step S21 specifically includes:
s211: at room temperature, opening a color development characteristic observation platform switch, and selecting ultraviolet excitation light with the wavelength range of 330-400 nm;
s212: cleaning the liquid sample pool by using absolute ethyl alcohol, and placing 5mL of the insulating oil sample with the selected sampling time of 0 into the liquid sample pool after the absolute ethyl alcohol is volatilized;
s213: exciting light with a specific wavelength penetrates through the exciting monochromator and irradiates the insulating oil, the insulating oil absorbs energy after being irradiated by the light, and electrons realize energy level transition so as to complete a color development process of quickly inactivating and emitting photons;
s214: the color development light of insulating oil gets rid of stray light and noise wherein through the filtering effect of transmission monochromator, assembles the reinforcing that obtains the light signal to photomultiplier along the light path, conveys in the RGB three-colour detector through optic fibre, and the RGB three-colour detector spreads into data processing system with the color development light signal of gathering into, turns into the signal of telecommunication with the light signal and carries out the processing and the record of color development image.
As a preferred technical scheme of the invention, at room temperature, the liquid sample cell is cleaned by absolute ethyl alcohol, after the absolute ethyl alcohol is volatilized, 5mL of insulating oil with different aging degrees is respectively placed in the liquid sample cell, and the steps S213 to S214 are repeated to obtain color development images of the insulating oil with different aging degrees under ultraviolet excitation light.
As a preferred technical solution of the present invention, the step S23 specifically includes: respectively replacing an excitation light source with blue light with the wavelength range of 420-485 nm and green light with the wavelength range of 490-550 nm, selecting samples with the aging time of 0-60 days for mineral insulating oil, and selecting samples with the aging time of 0-90 days for vegetable insulating oil; and repeating the steps S21 to S22 to respectively obtain the color development images of the insulating oil under the blue excitation light and the green excitation light.
As a preferred technical solution of the present invention, the step S23 specifically includes: and respectively replacing the excitation light source with blue excitation light with the wavelength range of 420-485 nm and green excitation light with the wavelength range of 490-550 nm, repeating the steps S21-S22, and respectively obtaining color development images of the insulating oil with different aging degrees under the blue excitation light and the green excitation light.
In a preferred embodiment of the present invention, 130 ℃ is selected as the heat aging test temperature in step S1, the sampling time of the vegetable insulating oil is set to 0,7, 15, 22, 35, 60, and 90 days, and the sampling time of the mineral insulating oil is set to 0,7, 15, 22, 35, and 60 days. Wherein 130 ℃ is selected as a thermal aging test temperature, sampling is carried out at different times to obtain the oil-paper insulation combinations with different aging degrees, the vegetable insulation oil still has fluorescence color development characteristics when thermally aged for 90 days, and nonspecific fluorescent carbonaceous particles formed in the thermal aging process are beneficial to maintaining the fluorescence color development characteristics. Polycyclic aromatic hydrocarbons in mineral insulating oil are degraded into smaller molecular fragments, and the samples after 60 days of thermal aging lose their fluorescent coloration characteristics. Thus, the vegetable insulating oil sampling time was set to 0,7, 15, 22, 35, 60, 90, 120 days, and the mineral insulating oil sampling time was set to 0,7, 15, 22, 35, 60 days.
Compared with the prior art, the diagnosis method for the aging of the transformer based on the insulating oil color development technology has the beneficial effects that: the method utilizes the change of the self color rendering characteristic of the insulating oil in the aging process, selects RGB three-color numerical values corresponding to the color rendering color of the insulating oil as aging characteristic quantities, and visually reflects the difference of the aging degrees of the insulating oil, thereby visually reflecting the aging degree of the transformer, solving the defects of limited field application, numerous influence factors or loss and the like caused by operations such as oil change, oil filtration and the like of the transformer in different degrees of the current main physicochemical and electrical characteristic quantities, providing a new thought and a feasible practical method for the aging evaluation of the transformer, and being capable of being used as a new evaluation method for the aging diagnosis of the transformer.
Drawings
FIG. 1 is a schematic diagram of a mineral insulating oil coloration observation platform in the method for diagnosing aging of a transformer based on insulating oil coloration technology of the present invention;
fig. 2 is a color image of mineral insulating oil with different aging degrees in the method for diagnosing transformer aging based on the insulating oil color development technology of the present invention.
Detailed Description
Example (b): the diagnosis method for the aging of the transformer based on the insulating oil coloring technology specifically comprises the following steps:
s1: adopting transformer insulating oil and common kraft insulating paper to carry out an oil-paper insulation accelerated thermal aging test to simulate the thermal aging process of oil-paper insulation in a transformer, and selecting different aging times to sample so as to obtain oil-paper insulation combinations with different aging degrees; the specific steps of the step S1 are as follows: selecting 120-130 ℃ as a thermal aging temperature to carry out an accelerated thermal aging test; the sampling time of the vegetable insulating oil is set to be 0-90 days, and the sampling time of the mineral insulating oil is set to be 0-60 days;
the specific steps of the step S1 are as follows:
s11: respectively treating the insulating paper and mineral insulating oil for 48h under the vacuum condition of 50Pa/90 ℃;
s12: mixing insulating paper and mineral insulating oil in proportion, placing in a ground reagent bottle with the capacity of 5L, treating for 48h under the vacuum condition of 50Pa/90 ℃ to ensure that the insulating paper is fully impregnated by the mineral insulating oil, and drying and degassing to remove water and gas; in the step S12, the ratio of the insulating paper to the mineral insulating oil is 1: 15. mixing the components according to the mass ratio; the initial moisture content of the insulating paper after drying and degassing treatment to remove moisture and gas is 0.5 percent, the initial moisture content of the mineral insulating oil is about 10 mu g/mL, and the dielectric loss is 0.05 percent;
s13: taking out the ground bottle after the oiled paper is dried and degassed, and adding a copper bar; the sizes of the copper bars added in the step S13 are as follows: 50cm × 1.5cm × 0.1cm; the surface area of the copper bar is about 150cm 2 (ii) a The thickness of the copper bar is very thin, the result is not influenced, and the thickness of the copper bar can be ignored;
s14: sealing the dried ground reagent bottle, sealing the dried ground reagent bottle by using a high-temperature-resistant preservative film at 180 ℃, leaving 15% of residual space in the ground reagent bottle without filling mineral insulating oil during sealing, and putting the ground reagent bottle into an aging oven to carry out an accelerated thermal aging test; selecting the temperature of 120-130 ℃ as the thermal aging temperature to carry out an accelerated thermal aging test, wherein the sampling time of the vegetable insulating oil is set to be 0-90 days, and the sampling time of the mineral insulating oil is set to be 0-60 days; wherein preferably, the temperature of the heat aging for carrying out the accelerated heat aging test is 130 ℃; aging times at sampling were set to 0,7, 15, 22, 35, 60, 90 and 120 days; wherein 130 ℃ is selected as a thermal aging test temperature, sampling is carried out at different times to obtain the oil-paper insulation combinations with different aging degrees, the vegetable insulation oil still has fluorescence color development characteristics when thermally aged for 90 days, and nonspecific fluorescent carbonaceous particles formed in the thermal aging process are beneficial to maintaining the fluorescence color development characteristics. Polycyclic aromatic hydrocarbons in mineral insulating oil are degraded into smaller molecular fragments, and the samples after 60 days of thermal aging lose their fluorescent coloration properties. Therefore, the sampling time of the vegetable insulating oil is set to 0,7, 15, 22, 35, 60 and 90 days, and the sampling time of the mineral insulating oil is set to 0,7, 15, 22, 35 and 60 days;
s2: carrying out color development observation on the insulating oil with different aging degrees in excitation light sources with different wavelengths, acquiring color development images of the insulating oil with different aging degrees under the luminescence of the different excitation light sources, and establishing a data model of the aging time of the insulating oil corresponding to RGB three-color numerical values, thereby monitoring and diagnosing the aging state of the transformer; the principle of the color development observation platform is shown in FIG. 1;
the specific steps of the step S2 are as follows:
s21: firstly, carrying out color development observation on the insulating oil obtained with the selected sampling time of 0 to obtain a color development image of the insulating oil, and transmitting data into a data processing system to carry out processing and recording on the color development image;
the specific steps of the step S21 are:
s211: at room temperature, opening a color development characteristic observation platform switch, and selecting ultraviolet excitation light with the wavelength range of 330-400 nm;
s212: cleaning the liquid sample pool by using absolute ethyl alcohol, and placing 5mL of the insulating oil sample with the selected sampling time of 0 into the liquid sample pool after the absolute ethyl alcohol is volatilized;
s213: exciting light with specific wavelength penetrates through the monochromator by excitation and irradiates the insulating oil, the insulating oil absorbs energy after being irradiated by light, and electrons realize energy level transition so as to complete the color development process of quickly inactivating and emitting photons;
s214: the color development light of insulating oil gets rid of stray light and noise wherein through the filtering effect of transmission monochromator, assembles the reinforcing that obtains the light signal to photomultiplier along the light path, conveys in the RGB three-colour detector through optic fibre, and the RGB three-colour detector spreads into data processing system with the color development light signal of gathering into, turns into the signal of telecommunication with the light signal and carries out the processing and the record of color development image.
S22: putting the insulating oil with different aging degrees obtained at other sampling time selected in the step S1 into a color development characteristic observation platform for color development observation to obtain color development images of the insulating oil with different aging degrees, and transmitting data into a data processing system for processing and recording the color development images;
the specific steps of step S22 are: cleaning the liquid sample cell by using absolute ethyl alcohol at room temperature, respectively placing 5mL of insulating oil with different aging degrees into the liquid sample cell after the absolute ethyl alcohol is volatilized, and repeating the steps S213-S214 to obtain color development images of the insulating oil with different aging degrees under ultraviolet excitation light;
s23: changing the excitation light source, and repeating the steps S21-S22 to obtain color development images of the insulating oil with different aging degrees under different excitation light sources; the specific steps of step S23 are: respectively replacing an excitation light source with blue excitation light with the wavelength range of 420-485 nm and green excitation light with the wavelength range of 490-550 nm, selecting samples with the aging time of 0-60 days by mineral insulating oil, and selecting samples with the aging time of 0-90 days by vegetable insulating oil; repeating the steps S21 to S22, and respectively obtaining color development images of the insulating oil with different aging degrees under the blue excitation light and the green excitation light;
s24: processing by color development image software to obtain RGB three-color numerical values corresponding to the color development colors of the insulating oil with different aging degrees, and establishing a data model corresponding to the aging time of the insulating oil and the RGB three-color numerical values;
the developed color is converted into RGB three-color numerical values after being processed by an RGB three-color detector, and the mineral insulating oil corresponds to the color ranges of green (0, 255,0), yellow (255, 255,0) and orange (255, 15,0); the vegetable insulating oil corresponds to the color ranges of cyan (0, 255, 255), yellow orange (255, 215,0) and orange red (255, 69,0). Therefore, the RGB three-color numerical value corresponding to the developed color of the insulating oil is selected as the aging characteristic quantity, the different aging degrees of the insulating oil are reflected visually, namely the developed color is selected as the characteristic quantity, the developed color corresponds to the aging degree, and the direct change of the developed color accompanied by the aging degree deepening of the insulating oil is used as a new quantitative evaluation method for the aging of the insulating oil transformer, so that the state of the transformer can be monitored and diagnosed quickly and visually.
Three specific examples are described in detail below.
Specific example 1: carrying out an oil-paper insulation accelerated thermal aging test by using Clarity 25# mineral insulating oil and common kraft insulating paper to simulate the thermal aging process of oil-paper insulation in a transformer, wherein the materials are respectively provided by China oil and gas resources Co., ltd and Taizhou New-sourced Electrical appliances Co., ltd; in the step S2, the FLS 1000 stable/transient fluorescence color development characteristic test platform and the RGB three-color detector are adopted to observe the insulating oil with different aging degrees, and the ozone-removing xenon lamp with the wavelength range of 230-870 nm and the power of 450W is selected as a test light source.
The diagnosis method for the aging of the transformer based on the insulating oil coloring technology specifically comprises the following steps:
s1: carrying out an oil-paper insulation accelerated thermal aging test on Clarity 25# mineral insulating oil and common kraft insulating paper to simulate the thermal aging process of oil-paper insulation in a transformer, and selecting 130 ℃ as a thermal aging temperature to carry out an accelerated thermal aging test; setting the sampling time to 0,7, 15, 22, 35 and 60 days to obtain the oil paper insulation combinations with different aging degrees; polycyclic aromatic hydrocarbon in the mineral insulating oil can be degraded into smaller molecular fragments, and a sample after being thermally aged for 60 days can lose the fluorescent color development characteristic;
s2: carrying out color development observation on the Clarity 25# mineral insulating oil with different aging degrees in excitation light sources with different wavelengths to obtain color development images of the insulating oil with different aging degrees under the luminescence of the excitation light sources, and establishing a data model of the aging time of the insulating oil corresponding to RGB three-color values so as to monitor and diagnose the aging state of the transformer;
the specific steps of the step S2 are as follows:
s21: firstly, carrying out color development observation on the Clarity 25# insulating oil with the sampling time (aging time) of 0 day to obtain a color development image, and transmitting data into a data processing system to carry out processing and recording on the color development image;
the specific steps of step S21 are:
s211: at room temperature, opening a switch of a color development characteristic observation platform, and selecting 330-400 nm ultraviolet excitation light;
s212: cleaning the liquid sample pool with absolute ethyl alcohol, and placing 5ml of Clarity 25# mineral insulating oil sample with the sampling time of 0 day into the liquid sample pool after the absolute ethyl alcohol is volatilized;
s213: the Clarity 25# insulating oil sample absorbs energy after being irradiated by 330-400 nm ultraviolet excitation light, and electrons realize energy level transition to complete the color development process of quick inactivation and emission of photons;
s214: the color development light of the Clarity 25# insulating oil is filtered by a transmitting monochromator to remove stray light and noise in the insulating oil, is converged to a photomultiplier along a light path to obtain the enhancement of an optical signal, and is transmitted to an RGB (red, green and blue) three-color detector through an optical fiber, the RGB three-color detector transmits the collected color development optical signal into a data processing system, and the optical signal is converted into an electric signal to process and record a color development image;
s22: putting the cramy 25# insulating oil samples to be tested with different aging times obtained at other selected sampling times in the step S14 into a color development characteristic observation platform for color development observation to obtain color development images of the cramy 25# insulating oil with different aging degrees, and transmitting data into a data processing system for processing and recording the color development images;
the specific steps of step S22 are: and (3) cleaning the liquid sample pool with absolute ethyl alcohol at room temperature, after the absolute ethyl alcohol is volatilized, respectively placing 5ml of the Clarityl 25# insulating oil samples with different aging degrees into the liquid sample pool, and repeating the steps S213-S214 to obtain color development images of the insulating oil with different aging degrees under ultraviolet excitation light.
S23: changing an excitation light source, respectively changing the excitation light source into 420-485 nm blue excitation light and 490-550 nm green excitation light, wherein the aging time of the mineral insulating oil is 0,7, 15, 22, 35 and 60 days, repeating the steps S21-S22, and respectively obtaining the color development images of the insulating oil under the blue excitation light and the green excitation light;
s24: RGB three-color numerical values corresponding to the insulation oil color development colors with different aging degrees are obtained through color development image software processing, and a data model of the insulation oil aging time corresponding to the RGB three-color numerical values is established.
The observation result shows that the Clarityl 25# mineral insulating oil has different color development characteristics under the irradiation of different exciting lights, and the insulating oil is excited by three lights of ultraviolet, blue and green when not aged, and the color development colors of the insulating oil belong to the blue, green and yellow ranges respectively. With the increase of the aging degree, the intensity of the developed color formed by photon emission is gradually reduced after the electron inactivation, and the developed color tends to move towards the long wave direction. The deeper the aging is, the gradually reduced degree of the green component and the gradually increased degree of the red component in the color development color of the mineral insulating oil are gradually increased until the color development color of the mineral insulating oil is changed into green, yellow and orange ranges under the excitation of ultraviolet, blue and green lights after the aging reaches a certain degree. The method selects the RGB three-color numerical values corresponding to the color development color as characteristic quantities, and the characteristic quantities respectively correspond to the ranges of green (0, 255,0), yellow (255, 255,0) and orange (255, 15,0). The RGB three-color value corresponds to the aging degree, the developing color accompanying the aging degree of the mineral insulating oil is deepened corresponds to the direct change of the RGB three-color value, therefore, the developing color is selected as a characteristic quantity, the developing color corresponds to the aging degree, the direct change of the developing color accompanying the aging degree of the insulating oil is deepened through the aging degree of the insulating oil, the method serves as a new quantitative evaluation method for the aging of the insulating oil transformer, and the state of the transformer can be monitored and diagnosed rapidly and visually.
Specific example 2: FR3 soybean insulating oil and common kraft insulating paper are adopted to carry out an oil-paper insulation accelerated thermal aging test to simulate the thermal aging process of oil-paper insulation in a transformer, and the materials are respectively provided by the American COOPER industrial company and the Thai Zhou New Source electric appliances company. In the step S2, the FLS 1000 stable/transient fluorescence color development characteristic test platform and the RGB three-color detector are adopted to observe the insulating oil with different aging degrees, and the ozone-removing xenon lamp with the wavelength range of 230-870 nm and the power of 450W is selected as a test light source.
The method for diagnosing the aging of the transformer based on the insulating oil coloring technology specifically comprises the following steps of:
s1: performing an oil-paper insulation accelerated thermal aging test on the insulation paper and FR3 soybean insulation oil to simulate the thermal aging process of oil-paper insulation in the transformer, and selecting 130 ℃ as a thermal aging temperature to perform an accelerated thermal aging test; setting the sampling time to 0,7, 15, 22, 35, 60 and 90 days to obtain the oil paper insulation combinations with different aging degrees; polycyclic aromatic hydrocarbon in the mineral insulating oil can be degraded into smaller molecular fragments, and a sample after being thermally aged for 60 days can lose the fluorescent color development characteristic;
s2: performing color development observation on the FR3 soybean insulating oil with different aging degrees in excitation light sources with different wavelengths to obtain color development images of the FR3 insulating oil with different aging degrees under the luminescence of the excitation light sources, and establishing a data model of the aging time of the FR3 insulating oil corresponding to RGB three-color values, so as to monitor and diagnose the aging state of the transformer; the specific steps of the step S2 are as follows:
s21: firstly, performing color development observation on FR3 soybean insulating oil with the selected sampling time of 0 day to obtain a color development image, and transmitting data into a data processing system for processing and recording the color development image;
the specific steps of step S21 are:
s211: at room temperature, opening a switch of a color development characteristic observation platform, and selecting 330-400 nm ultraviolet excitation light;
s212: cleaning the liquid sample pool with absolute ethyl alcohol, and placing 5mL of FR3 soybean insulating oil sample with the sampling time of 0 day into the liquid sample pool after the absolute ethyl alcohol is volatilized;
s213: the FR3 soybean insulating oil sample absorbs energy after being irradiated by 330-400 nm ultraviolet excitation light, and the electrons realize energy level transition to complete the color development process of quick inactivation and photon emission;
s214: the color development light of the FR3 soybean insulating oil is filtered by the emission monochromator to remove stray light and noise in the oil, is converged to the photomultiplier along a light path to obtain the enhancement of an optical signal, and is transmitted to the RGB three-color detector through an optical fiber, the RGB three-color detector transmits the collected color development optical signal into a data processing system, and the optical signal is converted into an electric signal to process and record a color development image;
s22: putting the FR3 soybean insulating oil samples to be tested with different aging times, which are obtained at other sampling times selected in the step S14, into a color development characteristic observation platform for color development observation to obtain color development images of the insulating oil with different aging degrees, and transmitting data into a data processing system for processing and recording the color development images;
the specific steps of step S22 are: and (3) cleaning the liquid sample pool with absolute ethyl alcohol at room temperature, after the absolute ethyl alcohol is volatilized, respectively placing 5mL of FR3 soybean insulating oil samples with different aging degrees obtained in other selected sampling time into the liquid sample pool, and repeating the steps S213-S214 to obtain color development images of the FR3 soybean insulating oil with different aging degrees under ultraviolet excitation light.
S23: changing an excitation light source, respectively changing the excitation light source into blue light with the wavelength of 420-485 nm and green light with the wavelength of 490-550 nm, selecting the aging time of the vegetable insulating oil to be 0,7, 15, 22, 35, 60 and 90 days, repeating the steps S21-S22, and obtaining a color development image of the FR3 soybean insulating oil under the excitation light of blue and green;
s24: RGB three-color numerical values corresponding to the color development colors of the insulating oil with different aging degrees are obtained through color development image software processing, and a data model of the aging time of the FR3 insulating oil and the RGB three-color numerical values is established.
The result shows that the FR3 insulating oil has different color development colors under the irradiation of different exciting lights, and the insulating oil is excited by three lights of ultraviolet, blue and green when not aged, and the color development colors of the insulating oil belong to the blue, green and yellow ranges respectively. With the increase of the aging degree, the intensity of the developed color formed by photon emission is gradually reduced after the electron inactivation, and the developed color tends to move towards the long wave direction. The deeper the aging is, the gradually reduced degree of the green component and the gradually increased degree of the red component in the color development color of the FR3 insulating oil are gradually increased until the aging reaches a certain degree, and the color development color of the FR3 insulating oil is changed into the ranges of blue-green, yellow-orange and orange-red under the excitation of three lights of ultraviolet, blue and green. Selecting the RGB three-color numerical value corresponding to the color development color as the characteristic quantity, and respectively corresponding to the ranges of blue green (0, 255, 255), yellow orange (255, 215,0) and orange red (255, 69,0). The RGB three-color value corresponds to the aging degree, the developing color accompanying the aging degree deepening of the FR3 soybean insulating oil corresponds to the direct change of the RGB three-color value, so that the developing color is selected as a characteristic quantity, the developing color corresponds to the aging degree, the direct change of the developing color accompanying the aging degree deepening of the insulating oil serves as a new quantitative insulating oil transformer aging evaluation method, and the state of the transformer can be monitored and diagnosed quickly and visually.
Specific example 3: PFAE palm insulating oil and common kraft insulating paper are adopted to carry out an oil-paper insulation accelerated thermal aging test to simulate the thermal aging process of oil-paper insulation in a transformer, and the materials are respectively provided by Japan AE Pavalra corporation and Thai New Source electric appliances Co. In the step S2, the FLS 1000 stable/transient fluorescence color development characteristic test platform and the RGB three-color detector are adopted to observe the insulating oil with different aging degrees, and the ozone-removing xenon lamp with the wavelength range of 230-870 nm and the power of 450W is selected as a test light source.
The diagnosis method for the aging of the transformer based on the insulating oil coloring technology specifically comprises the following steps:
s1: carrying out an oil-paper insulation accelerated thermal aging test on the insulation paper and PFAE palm insulation oil to simulate the thermal aging process of oil-paper insulation in a transformer, and selecting 130 ℃ as a thermal aging temperature to carry out an accelerated thermal aging test; setting the sampling time to 0,7, 15, 22, 35, 60 and 90 days to obtain the oil paper insulation combinations with different aging degrees; polycyclic aromatic hydrocarbon in the mineral insulating oil can be degraded into smaller molecular fragments, and a sample after being thermally aged for 60 days can lose the fluorescent color development characteristic;
s2: performing color development observation on PFAE palm insulating oil with different aging degrees in excitation light sources with different wavelengths, acquiring color development images of the PFAE palm insulating oil with different aging degrees under the luminescence of the excitation light sources, and establishing a data model of the aging time of the PFAE palm insulating oil corresponding to RGB three-color values, thereby monitoring and diagnosing the aging state of the transformer;
the specific steps of the step S2 are as follows:
s21: firstly, performing color development observation on PFAE palm insulating oil with the selected sampling time of 0 day to obtain a color development image, and transmitting data into a data processing system to perform processing and recording of the color development image;
the specific steps of the step S21 are:
s211: at room temperature, opening a switch of a color development characteristic observation platform, and selecting 330-400 nm ultraviolet excitation light;
s212: cleaning the liquid sample pool by using absolute ethyl alcohol, and after the absolute ethyl alcohol is volatilized, placing 5mL of PFAE palm insulating oil sample with the selected sampling time of 0 day into the liquid sample pool;
s213: the PFAE palm insulating oil sample absorbs energy after being irradiated by 375nm ultraviolet excitation light, electrons realize energy level transition, and a color development process of rapid inactivation and photon emission is completed;
s214: the color development light of PFAE palm insulating oil is filtered by a transmitting monochromator to remove stray light and noise in the color development light, the stray light and the noise are converged to a photomultiplier along a light path to obtain the enhancement of an optical signal, the optical signal is transmitted to an RGB (red, green and blue) three-color detector through an optical fiber, the RGB three-color detector transmits the collected color development optical signal into a data processing system, and the optical signal is converted into an electric signal to process and record a color development image;
s22: putting PFAE palm insulating oil samples to be tested with different aging times obtained at other selected sampling times in the step S14 into a color development characteristic observation platform for color development observation to obtain color development images of PFAE palm insulating oil with different aging degrees, and transmitting data into a data processing system for processing and recording the color development images;
the specific steps of step S22 are: and (3) cleaning the liquid sample pool with absolute ethyl alcohol at room temperature, respectively placing 5mL of PFAE palm insulating oil samples with different aging degrees obtained at other selected sampling time into the liquid sample pool after the absolute ethyl alcohol is volatilized, and repeating the steps S213-S214 to obtain color development images of the PFAE palm insulating oil with different aging degrees under ultraviolet excitation light.
S23: changing an excitation light source, respectively changing the excitation light source into 420-485 nm blue excitation light and 490-550 nm green excitation light, selecting the aging time of the plant insulating oil to be 0,7, 15, 22, 35, 60 and 90 days, repeating the steps S21-S22, and obtaining a color development image of the PFAE palm insulating oil under the blue excitation light and the green excitation light;
s24: RGB three-color values corresponding to the color development colors of the PFAE palm insulating oil with different aging degrees are obtained through color development image software processing, and a data model of the aging time of the PFAE palm insulating oil and the RGB three-color values is established.
The result shows that PFAE palm insulating oil has different color development colors under the irradiation of different exciting lights, and when the insulating oil is not aged, the insulating oil is excited by three lights of ultraviolet, blue and green, and the color development colors of the insulating oil belong to the blue, green and yellow ranges respectively. With the increase of the aging degree, the intensity of the developed color formed by photon emission is gradually reduced after the electron inactivation, and the developed color tends to move towards the long wave direction. The deeper the aging is, the gradually reduced degree of the green component and the gradually increased degree of the red component in the color development color of the PFAE palm insulating oil are gradually increased until the color development color of the PFAE palm insulating oil is changed into blue-green, yellow-orange and orange-red under the excitation of ultraviolet, blue and green lights after the PFAE palm insulating oil is aged to a certain degree. Selecting RGB three-color values corresponding to the color development color as characteristic quantities, and corresponding the RGB three-color values to the aging degree to respectively correspond to the ranges of blue-green (0, 255, 255), yellow-orange (255, 215,0) and orange-red (255, 69,0). A novel quantitative aging evaluation method is provided through the direct change of the developing color corresponding to the RGB three-color numerical value accompanying the deepening of the aging degree of the PFAE palm insulating oil, and the state of the transformer is rapidly and visually monitored and diagnosed. Therefore, the developed color is selected as the characteristic quantity, the developed color corresponds to the aging degree, and the state of the transformer can be rapidly and intuitively monitored and diagnosed by taking the developed color as a new quantitative evaluation method for the aging of the insulating oil transformer through the direct change of the developed color accompanied by the aging degree deepening of the insulating oil.
The wavelengths of the ultraviolet excitation light, the blue light and the green light in the above-described embodiments 1 to 3 may be changed within the wavelength range.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like, such as changes in wavelength range, are made within the spirit and principle of the present invention; are intended to be included within the scope of the present invention.
Claims (7)
1. A diagnosis method for transformer aging based on insulating oil color development technology is characterized by comprising the following steps:
s1: adopting transformer insulating oil and common kraft insulating paper to carry out an oil-paper insulation accelerated thermal aging test to simulate the thermal aging process of oil-paper insulation in a transformer, and selecting different aging times to sample so as to obtain oil-paper insulation combinations with different aging degrees;
s2: and carrying out color development observation on the insulating oil with different aging degrees in excitation light sources with different wavelengths, acquiring color development images of the insulating oil with different aging degrees under the luminescence of the excitation light sources, and establishing a data model of the aging time of the insulating oil corresponding to RGB three-color numerical values, thereby monitoring and diagnosing the aging state of the transformer.
2. The method for diagnosing the aging of the transformer based on the insulation oil coloring technology according to claim 1, wherein the step S1 comprises the following specific steps: selecting the temperature of 120-130 ℃ as the temperature of a thermal aging test; the sampling time of the vegetable insulating oil is set to be 0-90 days, and the sampling time of the mineral insulating oil is set to be 0-60 days.
3. The method for diagnosing the aging of the transformer based on the insulation oil coloring technology according to claim 2, wherein the step S2 comprises the following specific steps:
s21: firstly, carrying out color development observation on the insulating oil obtained with the selected sampling time of 0 to obtain a color development image of the insulating oil, and transmitting data into a data processing system to carry out processing and recording on the color development image;
s22: putting the insulating oil with different aging degrees obtained at other sampling time selected in the step S1 into a color development characteristic observation platform for color development observation to obtain color development images of the insulating oil with different aging degrees, and transmitting data into a data processing system for processing and recording the color development images;
s23: changing the excitation light source, and repeating the steps S21-S22 to obtain color development images of the insulating oil with different aging degrees under different excitation light sources;
s24: RGB three-color numerical values corresponding to the insulation oil color development colors with different aging degrees are obtained through color development image software processing, and a data model of the insulation oil aging time corresponding to the RGB three-color numerical values is established.
4. The method for diagnosing the aging of the transformer based on the insulation oil coloring technology according to claim 3, wherein the step S21 comprises the following steps:
s211: at room temperature, opening a color development characteristic observation platform switch, and selecting ultraviolet excitation light with the wavelength range of 330-400 nm;
s212: cleaning the liquid sample pool by using absolute ethyl alcohol, and placing 5mL of the insulating oil sample with the selected sampling time of 0 into the liquid sample pool after the absolute ethyl alcohol is volatilized;
s213: exciting light with a specific wavelength penetrates through the exciting monochromator and irradiates the insulating oil, the insulating oil absorbs energy after being irradiated by the light, and electrons realize energy level transition so as to complete the color development process of inactivation and emission of photons;
s214: the color development light of insulating oil gets rid of stray light and noise wherein through the filtering effect of transmission monochromator, assembles the reinforcing that obtains the light signal to photomultiplier along the light path, conveys in the RGB three-colour detector through optic fibre, and the RGB three-colour detector spreads into data processing system with the color development light signal of gathering into, turns into the signal of telecommunication with the light signal and carries out the processing and the record of color development image.
5. The method for diagnosing the aging of the transformer based on the insulation oil coloring technology according to claim 4, wherein the step S22 comprises the following steps:
and (3) cleaning the liquid sample cell by using absolute ethyl alcohol at room temperature, respectively placing 5mL of insulating oil with different aging degrees into the liquid sample cell after the absolute ethyl alcohol is volatilized, and repeating the steps S213-S214 to obtain color development images of the insulating oil with different aging degrees under ultraviolet excitation light.
6. The method for diagnosing the aging of the transformer based on the insulation oil coloring technology according to claim 5, wherein the step S23 comprises the following steps: and (3) respectively replacing the excitation light source with blue excitation light with the wavelength range of 420-485 nm and green excitation light with the wavelength range of 490-550 nm, repeating the steps S21-S22, and respectively obtaining the color development images of the insulating oil with different aging degrees under the blue excitation light and the green excitation light.
7. The method for diagnosing transformer aging based on insulating oil coloring technology according to claim 2, wherein 130 ℃ is selected as a thermal aging test temperature in the step S1; sampling times for vegetable insulating oil were set to 0,7, 15, 22, 35, 60 and 90 days, and sampling times for mineral insulating oil were set to 0,7, 15, 22, 35 and 60 days.
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