CN219038828U - Transformer oil fluorescence excitation source - Google Patents
Transformer oil fluorescence excitation source Download PDFInfo
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- CN219038828U CN219038828U CN202223316568.3U CN202223316568U CN219038828U CN 219038828 U CN219038828 U CN 219038828U CN 202223316568 U CN202223316568 U CN 202223316568U CN 219038828 U CN219038828 U CN 219038828U
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Abstract
The utility model relates to a fluorescent excitation source of transformer oil, which belongs to the technical field of transformer fault diagnosis and solves the problems of large volume and weight, high manufacturing cost and inconvenient use of the existing device; compared with the prior art, the device has the advantages that the device is simple in structure, the fluorescence spectrometer is directly adopted for excitation, the volume and the weight of the device are greatly reduced, the device is convenient to use, the service life of the device adopting a monochromatic LED excitation light source is long, and the cost is low.
Description
Technical Field
The utility model belongs to the technical field of transformer fault diagnosis, and relates to a transformer oil fluorescence excitation source.
Background
The transformer is used as the core of energy conversion in the electric energy production and distribution process, has huge quantity and wide influence, the running state of the transformer directly influences the safe and reliable running of a power system, and once the transformer has an accident, the transformer not only damages expensive (the price of a single transformer is up to 5000 ten thousand yuan) electrical equipment, but also can cause large-area power failure, even casualties, environmental pollution and huge economic and social losses, so that the monitoring of the running state of the transformer becomes particularly important.
The transformer oil is an insulating oil product which is used in oil-filled electrical equipment such as transformers, reactors, transformers, bushings, oil switches and the like and has the functions of insulation, cooling and arc extinction. Transformer oil is a fractionation product of petroleum whose main components are alkanes, naphthenic saturated hydrocarbons, aromatic unsaturated hydrocarbons, and non-hydrocarbon compounds. The transformer oil can emit fluorescence under the irradiation of ultraviolet rays or X rays. By fluorescence is meant a photoluminescence cold-emission phenomenon. When a certain normal temperature substance is irradiated by incident light (usually ultraviolet rays or X rays) with a certain wavelength, the light energy is absorbed and enters an excited state, and the excited state is immediately de-excited and emits emergent light (usually with a wavelength in a visible light band) longer than the wavelength of the incident light; and once the incident light is stopped, the luminescence phenomenon also disappears immediately, and the emitted light having this property is called fluorescence.
The fluorescence detection technology (FMS) of the running state of the transformer analyzes the change of the optical signal of the transformer oil through a fluorescence detection device, so that the purpose of monitoring the transformer is achieved; for example, the published China patent literature of the utility model, which is published by 2021, no. 07, no. 13 and CN113109682A, discloses a fluorescent online detection device for transformer oil, which has the characteristics of high sensitivity, short analysis time, no interference of surrounding environment magnetic fields and electric fields, good stability and reproducibility and the like, and can realize the online fault detection requirement under the running state of a transformer.
When the fluorescent detection device is used, a fluorescent excitation source is required to be designed to generate monochromatic light with specific wavelength to perform fluorescent excitation on transformer oil, the prior art directly adopts a fluorescent spectrometer to perform excitation, the excitation light source of the fluorescent spectrometer adopts a xenon lamp to be matched with an excitation monochromator, so that monochromatic light with a plurality of different wavelengths can be generated for a user to select, but the xenon lamp and the excitation monochromator adopted by the excitation light source have the defects of large size and heavy weight, and because the field operation space is limited, equipment with large size and heavy weight is inconvenient to operate, and fluorescent light is very inconvenient to operateThe cost of the spectrometer is not very good. The national standard GB2536-90 of transformer oil divides the transformer oil into three marks with the freezing point height of 10 # 、25 # And 45 (V) # The fluorescence characteristic values of the fluorescence spectrums of the transformer oil are distributed between 350nm and 500nm wave bands, so that the fault detection of the transformer can be realized by only one single-color light, and the single-color light with multiple wavelengths is not needed.
Disclosure of Invention
The utility model aims to solve the technical problems of large volume and weight, high manufacturing cost and inconvenient use of the existing device by designing a transformer oil fluorescence excitation source with optimal excitation wavelength.
The utility model solves the technical problems through the following technical scheme:
a transformer oil fluorescence excitation source, comprising: the fluorescent excitation darkroom (120), a monochromatic optimal wavelength LED excitation light source (121), a converging lens (123) and an optical fiber head (125); the monochromatic optimal wavelength LED excitation light source (121), the converging lens (123) and the optical fiber head (125) are fixedly arranged in the fluorescent excitation darkroom (120), the converging lens (123) is arranged between the monochromatic optimal wavelength LED excitation light source (121) and the optical fiber head (125), and the central lines of the monochromatic optimal wavelength LED excitation light source (121), the converging lens (123) and the optical fiber interface (126) are on the same straight line; the method for selecting the excitation wavelength of the monochromatic optimal wavelength LED excitation light source (121) comprises the following steps: collecting three-dimensional fluorescence spectrum data of different types of transformer oil, and determining an optimal excitation wavelength range according to a fluorescence characteristic value distribution range of a fluorescence spectrum of the transformer oil; comparing the main peak intensities of the sample features under different excitation wavelengths by taking the excitation wavelengths as an abscissa and the main peak intensities as an ordinate; comparing the discrete degree of the sample characteristics under different excitation wavelengths by taking the excitation wavelength as an abscissa and taking the variation coefficient as an ordinate; the excitation wavelength with the maximized main peak intensity and variation coefficient is selected as the excitation wavelength of the monochromatic optimal wavelength LED excitation light source (121); the calculation formula of the variation coefficient is as follows:
wherein c v The larger the coefficient of variation, the larger the degree of dispersion is, and δ is the standard deviation and μ is the average value.
According to the utility model, through comparing the main peak intensity and the discrete degree of sample characteristics under different excitation wavelengths, the excitation wavelength with the maximized main peak intensity and variation coefficient is selected as the excitation wavelength of the monochromatic optimal wavelength LED excitation light source (121), the monochromatic optimal wavelength LED excitation light source (121) emits monochromatic excitation light, the excitation light is converged on the optical fiber head (125) through the converging lens (123), and the optical fiber head (125) collects the excitation light and conducts the excitation light out through the optical fiber interface (126) for exciting transformer oil to generate fluorescence; compared with the prior art, the device has the advantages that the device is simple in structure, the fluorescence spectrometer is directly adopted for excitation, the volume and the weight of the device are greatly reduced, the device is convenient to use, the service life of the device adopting a monochromatic LED excitation light source is long, and the cost is low.
Further, the method further comprises the following steps: the optical fiber interface (126), the optical fiber interface (126) is fixedly arranged on the side wall outside the fluorescence excitation darkroom (120), and the optical fiber head (125) is connected with the optical fiber interface (126) in a matched mode.
Further, the method further comprises the following steps: the fluorescent light source comprises an excitation light source mounting bracket (122), wherein the excitation light source mounting bracket (122) is fixedly arranged on an inner bottom plate of a fluorescent excitation darkroom (120), and a monochromatic optimal wavelength LED excitation light source (121) is arranged on the excitation light source mounting bracket (122).
Further, the method further comprises the following steps: the lens mounting bracket (124), the lens mounting bracket (124) is fixedly arranged on the inner bottom plate of the fluorescence excitation darkroom (120), and the converging lens (123) is embedded and mounted in the lens mounting bracket (124).
Further, the optical fiber interface (126) adopts an ST-SC standard optical fiber interface.
The utility model has the advantages that:
according to the utility model, through comparing the main peak intensity and the discrete degree of sample characteristics under different excitation wavelengths, the excitation wavelength with the maximized main peak intensity and variation coefficient is selected as the excitation wavelength of the monochromatic optimal wavelength LED excitation light source (121), the monochromatic optimal wavelength LED excitation light source (121) emits monochromatic excitation light, the excitation light is converged on the optical fiber head (125) through the converging lens (123), and the optical fiber head (125) collects the excitation light and conducts the excitation light out through the optical fiber interface (126) for exciting transformer oil to generate fluorescence; compared with the prior art, the device has the advantages that the device is simple in structure, the fluorescence spectrometer is directly adopted for excitation, the volume and the weight of the device are greatly reduced, the device is convenient to use, the service life of the device adopting a monochromatic LED excitation light source is long, and the cost is low.
Drawings
FIG. 1 is a first three-dimensional view of a transformer oil fluorescence excitation source according to an embodiment of the present utility model;
FIG. 2 is a second three-dimensional view of a transformer oil fluorescence excitation source according to an embodiment of the present utility model;
FIG. 3 is a top view of a fluorescent excitation source for transformer oil according to an embodiment of the present utility model;
FIG. 4 is a flow chart of a method for selecting optimal excitation wavelengths of a fluorescent excitation source of transformer oil according to an embodiment of the present utility model;
FIG. 5 is a plot of excitation wavelength scanning fluorescence spectra of a new oil sample;
FIG. 6 is a graph showing the main peak intensity versus different excitation wavelengths for a particular embodiment of the present utility model for determining the optimal excitation wavelength of a Kelamanii oil;
FIG. 7 is a graph showing the variation coefficient of the clarituximab oil at the optimal excitation wavelength and the different excitation wavelengths according to the embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described in the following in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The technical scheme of the utility model is further described below with reference to the attached drawings and specific embodiments:
example 1
As shown in fig. 1 to 3, the transformer oil fluorescence excitation source of the present embodiment includes: the fluorescent excitation darkroom (120), a monochromatic optimal wavelength LED excitation light source (121), an excitation light source mounting bracket (122), a converging lens (123), a lens mounting bracket (124), an optical fiber head (125) and an optical fiber interface (126); the excitation light source mounting bracket (122) is fixedly arranged at the left end of the inner bottom plate of the fluorescence excitation darkroom (120), and the monochromatic optimal wavelength LED excitation light source (121) is mounted on the excitation light source mounting bracket (122); the lens mounting bracket (124) is fixedly arranged at the middle position inside the fluorescence excitation darkroom (120), and the converging lens (123) is embedded and mounted in the lens mounting bracket (124); the optical fiber head (125) is fixedly arranged on the side wall of the right end inside the fluorescence excitation darkroom (120), the optical fiber interface (126) is fixedly arranged on the side wall of the right end outside the fluorescence excitation darkroom (120), and the optical fiber head (125) is connected with the optical fiber interface (126) in a matching way; the central lines of the monochromatic optimal wavelength LED excitation light source (121), the converging lens (123) and the optical fiber interface (126) are on the same straight line.
The inner wall of the fluorescence excitation darkroom (120) is coated with light absorption paint, so that the external interference of ambient light is avoided, and the influence of internal multiple reflection light is eliminated; the monochromatic optimal wavelength LED excitation light source (121) emits monochromatic ultraviolet light for exciting transformer oil; the converging lens (123) adopts a convex lens and is used for converging monochromatic ultraviolet light emitted by the monochromatic optimal wavelength LED excitation light source (121) onto the optical fiber head (125); the optical fiber head (125) is used for collecting monochromatic ultraviolet light emitted by the monochromatic optimal wavelength LED excitation light source (121); the optical fiber interface (126) adopts an ST-SC standard optical fiber interface and is used for exporting monochromatic ultraviolet light emitted by the monochromatic optimal wavelength LED excitation light source (121).
Workflow of fluorescence excitation source:
the monochromatic optimal wavelength LED excitation light source (121) emits monochromatic excitation light, the excitation light is converged on the optical fiber head (125) through the converging lens (123), and the optical fiber head (125) collects the excitation light and conducts the excitation light out through the optical fiber interface (126) for exciting transformer oil to generate fluorescence.
As shown in fig. 4, the method for selecting the optimal excitation wavelength of the monochromatic optimal wavelength LED excitation light source (121) is as follows:
firstly, three-dimensional fluorescence spectrum data of different types of transformer oil are collected, as shown in fig. 5, the excitation wavelength of a new oil sample scans the fluorescence spectrum, and it can be found that the fluorescence characteristic value of the fluorescence spectrum of the transformer oil is distributed between 350nm and 500nm, and the fluorescence spectrum can most obviously show the characteristic of the sample in the range, namely, the characteristic peak is clear and distinguishable and has regularity, and the excitation wavelength range is 270nm to 310nm.
Secondly, the excitation wavelength (Excitation Wavelength) is taken as an abscissa, and the main Peak Intensity (Peak Intensity) is taken as an ordinate, so that the main Peak intensities of sample characteristics under different excitation wavelengths are compared; then, the excitation wavelength (Excitation Wavelength) is taken as an abscissa, and the variation coefficient (Coefficient of Variation) is taken as an ordinate, so that the discrete degree of the sample characteristics under different excitation wavelengths is compared; the calculation formula of the variation coefficient (Coefficient of Variation) is as follows:
wherein c v The larger the coefficient of variation, the larger the degree of dispersion is, and δ is the standard deviation and μ is the average value.
The optimal excitation wavelength should be maximized to meet both the primary Peak Intensity (Peak Intensity) and the coefficient of variation (Coefficient of Variation).
As shown in fig. 6 and 7, three-dimensional fluorescence spectrum analysis experiments were performed on the clematine oil, the excitation wavelength was selected to be 270nm to 310nm, and the main Peak Intensity (Peak Intensity) and the coefficient of variation (Coefficient of Variation) were compared, and it was found that the excitation wavelength was both maximum at 270nm, so that the optimal excitation wavelength was 270nm.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (5)
1. A transformer oil fluorescence excitation source, comprising: the fluorescent excitation darkroom (120), a monochromatic optimal wavelength LED excitation light source (121), a converging lens (123) and an optical fiber head (125); the monochromatic optimal wavelength LED excitation light source (121), the converging lens (123) and the optical fiber head (125) are fixedly arranged in the fluorescent excitation darkroom (120), the converging lens (123) is arranged between the monochromatic optimal wavelength LED excitation light source (121) and the optical fiber head (125), and the central lines of the monochromatic optimal wavelength LED excitation light source (121), the converging lens (123) and the optical fiber interface (126) are on the same straight line.
2. The transformer oil fluorescence excitation source of claim 1, further comprising: the optical fiber interface (126), the optical fiber interface (126) is fixedly arranged on the side wall outside the fluorescence excitation darkroom (120), and the optical fiber head (125) is connected with the optical fiber interface (126) in a matched mode.
3. The transformer oil fluorescence excitation source of claim 2, further comprising: the fluorescent light source comprises an excitation light source mounting bracket (122), wherein the excitation light source mounting bracket (122) is fixedly arranged on an inner bottom plate of a fluorescent excitation darkroom (120), and a monochromatic optimal wavelength LED excitation light source (121) is arranged on the excitation light source mounting bracket (122).
4. A transformer oil fluorescence excitation source according to claim 3, further comprising: the lens mounting bracket (124), the lens mounting bracket (124) is fixedly arranged on the inner bottom plate of the fluorescence excitation darkroom (120), and the converging lens (123) is embedded and mounted in the lens mounting bracket (124).
5. The transformer oil fluorescence excitation source of claim 4, wherein the fiber interface (126) is an ST-SC standard fiber interface.
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| CN202223316568.3U CN219038828U (en) | 2022-12-05 | 2022-12-05 | Transformer oil fluorescence excitation source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024119933A1 (en) * | 2022-12-05 | 2024-06-13 | 国网安徽省电力有限公司电力科学研究院 | Fault diagnosis apparatus and method based on transformer oil fluorescence multivariate calibration analysis |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024119933A1 (en) * | 2022-12-05 | 2024-06-13 | 国网安徽省电力有限公司电力科学研究院 | Fault diagnosis apparatus and method based on transformer oil fluorescence multivariate calibration analysis |
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