Fault diagnosis device and method based on fluorescent multivariate correction analysis of transformer oil

Abstract

The present invention relates to a fault diagnosis apparatus and method based on a fluorescence multivariate compensation analysis of transformer oil, which belongs to the technical field of transformer fault diagnosis and solves the problems of large volume and weight of the apparatus, high cost and difficulty of use that exist in the related art when a fluorescence spectrometer is directly used to collect the fluorescence spectrum of transformer oil. The present invention excites the transformer oil in a fluorescence excitation detection device to generate fluorescence by a monochromatic excitation light of an optimal excitation wavelength generated by a fluorescence excitation source, and the fluorescence excitation detection device generates fluorescence based on the input monochromatic excitation light and inputs it to a fluorescence signal collection and analysis device. The fluorescence signal collection and analysis device uses a multivariate compensation filter group instead of a component called an emission monochromator of a fluorescence spectrometer to collect and analyze the fluorescence signal emitted from the transformer oil, thereby reducing the cost and volume of the device, while quickly processing data, thereby improving the cost performance of transformer oil fault detection and realizing the engineering application of fluorescence monitoring technology in the aspect of transformer fault online diagnosis.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This disclosure claims priority to a Chinese patent with application number 202211549718.7, filed with the China Patent Office on December 5, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of transformer fault diagnosis, and for example to a fault diagnosis apparatus and method based on fluorescent multivariate correction analysis of transformer oil. [Background technology]

[0003] Transformers, as the core of energy conversion in the production and distribution of electric energy, are huge in number and have a wide impact. Their operating status directly affects the safe and reliable operation of the power system. Once a transformer accident occurs, it will not only damage expensive electrical equipment (the price of a single transformer reaches 50 million yuan), but also cause large-scale power outages, and even cause human casualties and environmental pollution, resulting in huge economic and social losses. Therefore, monitoring the operating status of transformers is particularly important.

[0004] Transformer oil refers to insulating oil used in oil-filled electrical equipment such as transformers, reactors, mutual inductors, bushings, and oil switches, and serves the functions of insulation, cooling, and arc extinguishing. Transformer oil is a fractional distillation product of petroleum, and its main components are alkanes, naphthenic saturated hydrocarbons, aromatic unsaturated hydrocarbons, and non-hydrocarbon compounds. Transformer oil can emit fluorescence when irradiated with ultraviolet light or X-rays. The so-called fluorescence refers to the luminescence phenomenon of photoluminescence. When a substance at room temperature is irradiated with incident light of a certain wavelength (usually ultraviolet light or X-rays), it enters an excited state after absorbing the light energy, and is immediately de-excited to emit outgoing light (usually the wavelength is in the visible light wavelength range) that is longer than the wavelength of the incident light, and once the incidence of light is stopped, the luminescence phenomenon also immediately disappears. The outgoing light having such properties is called fluorescence.

[0005] With the development of transformer operation status monitoring technology, mature monitoring methods such as local discharge test method represented by on-site detection during operation, insulating oil physicochemical test method represented by offline sampling, and dissolved gas analysis (DGA) technology represented by online automatic monitoring have appeared one after another. Among them, local discharge test is often used for on-site inspection of insulation status before equipment is put into operation or after maintenance, insulating oil physicochemical test needs to accurately measure the physicochemical properties of insulating oil in a laboratory, and neither of the two methods can realize online automatic monitoring and analysis of the transformer operation status, while DGA is a technology to diagnose the transformer status online by analyzing the content of gas dissolved in oil, which has the advantages of being unaffected by various electromagnetic interferences, high reliability of the obtained data, and mature technology, and is gradually becoming the mainstream of transformer operation status monitoring technology. However, with the increasing application of DGA, the following shortcomings have been revealed: (1) when the main transformer discharges, no gas is generated or the amount of gas released is very small, so DGA cannot detect it or cannot detect low concentration gas; (2) when a discharge fault occurs in the main transformer, the amount of discharge continues to increase in a short time, and a large amount of gas is rapidly released, but the current DGA analysis method takes 2 hours for a single analysis. Whether the problem of inspection omissions or monitoring delays leads to certain safety accidents, in recent years, more and more scholars have been researching transformer operating status monitoring technology based on truly fast, real-time and safe fluorescent monitoring.

[0006] The fluorescent detection technology of the running state of a transformer has many advantages such as fast detection speed, real-time response, lossless detection, and high accuracy, and has great potential in the technical field of monitoring the running state of a transformer. For example, the fluorescent online detection device of transformer insulating oil disclosed in the Chinese invention patent document "Fluorescence online detection device of transformer insulating oil" with the application publication date of July 13, 2021 and application publication number CN113109682A has the characteristics of high sensitivity, short analysis time, no interference from magnetic and electric fields in the surrounding environment, good stability and reproducibility, etc., and can realize the needs of online fault detection in the running state of a transformer. However, the fluorescent monitoring of transformers in the related technology is all based on laboratory conditions, using scientific research devices represented by fluorescence spectrometers to complete the collection of the fluorescent spectrum of insulating oil, and establishing transformer running fault diagnosis by methods such as mode identification, which have problems such as large device volume, high cost, and long data collection and processing time that restrict the online real-time monitoring ability. Summary of the Invention

[0007] The present application aims to solve the problem that the fluorescent analysis fault diagnosis device of transformer oil in the related art directly adopts a fluorescent spectrometer to collect the fluorescent spectrum of transformer oil, which is large in volume and weight, high in cost, and difficult to use. In order to solve this problem, the present application aims to solve the technical problem of how to design a transformer fault diagnosis device based on fluorescent analysis of transformer oil that is small in volume and weight, low in cost, and easy to use.

[0008] An embodiment of the present application provides a fault diagnosis device based on fluorescence multivariate correction analysis of transformer oil, comprising an equipment housing, an oil extraction device, a fluorescence excitation source, a fluorescence excitation detection device, a fluorescence signal collection and analysis device, all of which are provided inside the equipment housing, and a display provided on a front panel of the equipment housing, wherein the oil extraction device is hermetically connected to an external transformer oil tank and the fluorescence excitation detection device via pipelines, the fluorescence excitation source is connected to the fluorescence excitation detection device via optical fiber, and the fluorescence excitation detection device is connected to the fluorescence signal collection and analysis device via optical fiber, the oil extraction device is connected to the transformer oil tank and the fluorescence excitation detection device after evacuation, and injecting the transformer oil in the transformer oil tank into the fluorescence excitation detection device due to the pressure difference between the transformer oil tank and the fluorescence excitation source; the monochromatic excitation light of an optimal excitation wavelength generated by the fluorescence excitation source is used to excite the transformer oil in the fluorescence excitation detection device to generate fluorescence; the fluorescence excitation detection device generates fluorescence based on the input monochromatic excitation light, and inputs the fluorescence to the fluorescence signal acquisition and analysis device; the fluorescence signal acquisition and analysis device employs a group of multivariate correction filters to acquire a fluorescence signal emitted from the transformer oil and analyze the type of transformer fault; and the display is configured to display the results acquired and analyzed by the fluorescence signal acquisition and analysis device. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Diagram 2] FIG. 2 is a front view of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Diagram 3] FIG. 2 is a rear view of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Figure 4] FIG. 2 is a left side view of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Diagram 5] FIG. 2 is a right side view of the fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Figure 6]FIG. 1 is a plan view of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Figure 7] FIG. 2 is a perspective view of an oil extraction device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Figure 8] FIG. 2 is a plan view of an oil extraction device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Figure 9] FIG. 2 is a front view of an oil extraction device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Figure 10] FIG. 2 is a rear view of an oil extraction device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Figure 11] FIG. 2 is a left side view of an oil extraction device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Figure 12] FIG. 2 is a right side view of an oil extraction device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Figure 13] FIG. 2 is a workflow diagram of an oil extraction device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Figure 14] 1 is a first three-dimensional view of the fluorescent excitation source of the fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application; [Figure 15] 1 is a second three-dimensional view of the fluorescent excitation source of the fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application; [Figure 16] FIG. 2 is a plan view of a fluorescent excitation source of the fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Figure 17] FIG. 2 is a flow diagram of a method for selecting an optimal excitation wavelength of a fluorescent excitation source of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Figure 18] 1 is an excitation wavelength scanning fluorescence spectrum of a fresh oil sample of the present application. [Figure 19] FIG. 2 is a curve relationship diagram of main peak intensity and different excitation wavelengths when determining the optimal excitation wavelength of Karamay oil of the present application. [Figure 20]FIG. 2 is a curve relationship diagram of the coefficient of variation and different excitation wavelengths when determining the optimal excitation wavelength of Karamay oil of the present application. [Figure 21] FIG. 2 is a perspective view of a fluorescence excitation detection device of a fault diagnosis device based on fluorescence multivariate correction analysis of transformer oil according to the present application. [Figure 22] FIG. 2 is a front view of the fluorescence excitation detection device of the fault diagnosis device based on the fluorescence multivariate correction analysis of transformer oil according to the present application. [Diagram 23] FIG. 2 is a rear view of the fluorescence excitation detection device of the fault diagnosis device based on the fluorescence multivariate correction analysis of transformer oil according to the present application. [Figure 24] FIG. 2 is a left side view of the fluorescence excitation detection device of the fault diagnosis device based on the fluorescence multivariate correction analysis of transformer oil according to the present application. [Diagram 25] FIG. 2 is a right side view of the fluorescence excitation detection device of the fault diagnosis device based on the fluorescence multivariate correction analysis of transformer oil according to the present application. [Figure 26] FIG. 2 is a plan view of a fluorescence excitation detection device of a fault diagnosis device based on fluorescence multivariate correction analysis of transformer oil according to the present application. [Figure 27] 1 is a perspective view of a fluorescent signal acquisition and analysis device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. FIG. [Figure 28] FIG. 2 is a front view of a fluorescent signal acquisition and analysis device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Figure 29] FIG. 2 is a rear view of the fluorescent signal acquisition and analysis device of the fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Diagram 30] 1 is a left side view of a fluorescent signal acquisition and analysis device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. FIG. [Diagram 31] FIG. 2 is a right side view of the fluorescent signal acquisition and analysis device of the fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil. [Diagram 32] FIG. 2 is a plan view of a fluorescent signal acquisition and analysis device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. [Diagram 33]1 is a structural schematic diagram of a filter wheel of a fluorescent signal acquisition and analysis device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. FIG. [Diagram 34] 1 is a schematic diagram of the calculation principle of the transmittance of a multivariate correction filter of a fluorescent signal collection and analysis device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application; FIG. [Diagram 35] FIG. 1 is a design flow diagram of a membrane system structure of a multivariate correction filter of a fluorescent signal collection and analysis device of a fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil according to the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments of the present application will be described with reference to the drawings. The described embodiments are some of the embodiments of the present application, but not all of the embodiments. All other embodiments obtained based on the embodiments of the present application without the need for creative labor by a person skilled in the art are within the scope of protection of the present application. Hereinafter, the present application will be described with reference to the drawings and embodiments of the specification.

[0011] Example 1 As shown in Figures 1 to 6, the fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil comprises an equipment housing 10, an oil extraction device 11, a fluorescent excitation source 12, a fluorescent excitation detection device 13, a fluorescent signal collection and analysis device 14, and a display 15. The inside of the equipment housing 10 is divided into two layers, an upper layer and a lower layer, and the upper layer and the lower layer are separated by a partition plate. The oil extraction device 11 and the fluorescent excitation detection device 13 are both provided on the bottom plate of the lower layer, the fluorescent excitation source 12 and the fluorescent signal collection and analysis device 14 are provided on the partition plate between the upper layer and the lower layer, and the display 15 is provided on the front panel of the upper layer.

[0012] The oil inlet of the oil extractor 11 is hermetically connected to the oil outlet of an external transformer oil tank via a pipeline, the oil drain of the oil extractor 11 is hermetically connected to the oil inlet of an external transformer oil tank via a pipeline, one end of the oil inlet two-way joint 115 of the oil extractor 11 is hermetically connected to the oil inlet of the fluorescence excitation detection device 13, the first optical fiber interface 126 of the fluorescence excitation source 12 is connected to the excitation light transmitting optical fiber interface 1322 of the fluorescence excitation detection device 13 via an optical fiber, and the fluorescence receiving optical fiber interface 1323 of the fluorescence excitation detection device 13 is connected to the second optical fiber interface 146 of the fluorescence signal sampling and analysis device 14 via an optical fiber.

[0013] The oil extraction device 11 is configured to inject the transformer oil in the transformer oil tank into the fluorescence excitation detection device 13 by using the pressure difference between the transformer oil tank and the fluorescence excitation detection device 13 after evacuation. The monochromatic excitation light generated by the fluorescence excitation source 12 is used to excite the transformer oil in the fluorescence excitation detection device 13 so that it generates fluorescence. The fluorescence excitation detection device 13 generates fluorescence based on the input monochromatic excitation light and inputs the fluorescence to the fluorescence signal collection and analysis device 14. The fluorescence signal collection and analysis device 14 is configured to collect the fluorescence signal emitted from the transformer oil using a multivariate correction filter group 143 and analyze the type of transformer fault. The display 15 is configured to display the results collected and analyzed by the fluorescence signal collection and analysis device 14.

[0014] As shown in Figures 7 to 12, the oil extraction device 11 comprises an oil inlet valve 111, an oil outlet valve 112, an oil extraction pump 113, an air pump 114, an oil inlet two-way joint 115, an oil discharge exhaust three-way joint 116, a mounting bracket 118, and an equipment bottom plate 117, and the oil inlet valve 111, the oil outlet valve 112, the oil extraction pump 113, and the air pump 114 are all fixedly attached to the equipment bottom plate 117, the oil inlet two-way joint 115 and the oil discharge exhaust three-way joint 116 are all fixedly attached to the mounting bracket 118, and the mounting bracket 118 is fixedly attached to the equipment bottom plate 117.

[0015] A first end of the oil inlet valve 111 is hermetically connected to the oil outlet of the transformer oil tank via a pipeline, a second end of the oil inlet valve 111 is hermetically connected to the first end of the oil inlet two-way joint 115 via a pipeline, a second end of the oil inlet two-way joint 115 is hermetically connected to the oil inlet of the detection cell 1312 of the fluorescence excitation detection device 13 via a pipeline, and a first end of the oil extraction pump 113 is hermetically connected to the first port of the oil discharge exhaust three-way joint 116 via a pipeline. A second end of the oil extraction pump 113 is hermetically connected to an oil outlet of a detection cell 1312 of the fluorescence excitation detection device 13 via a pipe, a second port of the oil discharge exhaust three-way joint 116 is hermetically connected to a first end of the oil outlet valve 112 via a pipe, a second end of the oil outlet valve 112 is hermetically connected to an oil inlet of a transformer oil tank via a pipe, and a third port of the oil discharge exhaust three-way joint 116 is hermetically connected to one end of an air pump 114 via a pipe. The oil extraction pump 113 is configured to suck out the insulating oil of the transformer (i.e., transformer oil) from within the detection cell 1312 of the fluorescence excitation detection device 13 after the detection is completed, and the air pump 114 is configured to suck out impurity gases within the internal pipes of the oil extraction device 11 and within the detection cell 1312 of the fluorescence excitation detection device 13.

[0016] As shown in FIG. 13, the workflow of the oil extractor 11 is as follows:

[0017] In S1, the internal pipes of the oil extractor 11 and the detection cell 1312 are evacuated to a vacuum. The oil inlet valve 111 and the oil outlet valve 112 are turned off, the oil extraction pump 113 is set to normal open mode, and the air pump 114 is started to evacuate the internal pipelines of the oil extraction device 11 and the fluorescence excitation detection device 13, and after the vacuum evacuating is completed, the oil extraction pump 113 is set to blocked mode and the air pump 114 is turned off.

[0018] In S2, the transformer oil is sucked into the fluorescence excitation detection device 13; The oil inlet valve 111 is turned on, and the transformer oil in the transformer oil tank is sucked into the detection cell 1312 of the fluorescence excitation detection device 13 due to the pressure difference between the oil outlet of the transformer oil tank and the fluorescence excitation detection device 13 after vacuum drawing. After the oil inlet is completed, the oil inlet valve 111 is turned off.

[0019] In S3, the transformer oil is returned and filled into the transformer oil tank; After the detection is completed, the oil outlet valve 112 is turned on, the air pump 114 is set to the blocked mode, and the oil extraction pump 113 is started to suck out the transformer oil in the fluorescence excitation detection device 13 and push it back into the transformer oil tank.

[0020] As shown in Figs. 14 to 16, the fluorescence excitation source 12 includes a fluorescence excitation darkroom 120, a monochromatic optimum wavelength light emitting diode (LED) excitation light source 121, an excitation light source mounting bracket 122, a focusing lens 123, a lens mounting bracket 124, an optical fiber head 125, and a first optical fiber interface 126. The excitation light source mounting bracket 122 is fixed to the left end of the bottom plate inside the fluorescence excitation darkroom 120, the monochromatic optimum wavelength LED excitation light source 121 is attached to the excitation light source mounting bracket 122, and the lens mounting bracket 124 is fixed to a middle position inside the fluorescence excitation darkroom 120, and the The focusing lens 123 is attached by fitting into a lens mounting bracket 124, the optical fiber head 125 is fixed to the side wall at the right end inside the fluorescence excitation darkroom 120, and the first optical fiber interface 126 is fixed to the side wall at the right end outside the fluorescence excitation darkroom 120, the optical fiber head 125 and the first optical fiber interface 126 are fitted together, and the center lines of the monochromatic optimal wavelength LED excitation light source 121, the focusing lens 123 and the first optical fiber interface 126 are in a straight line.

[0021] The inner wall of the fluorescence excitation darkroom 120 is coated with a light absorbing paint to prevent the intrusion of external light and to eliminate the effect of multiple reflections of light inside. The monochromatic optimal wavelength LED excitation light source 121 excites transformer oil by emitting monochromatic ultraviolet light. The focusing lens 123 adopts a convex lens and is configured to focus the monochromatic ultraviolet light emitted from the monochromatic optimal wavelength LED excitation light source 121 onto the optical fiber head 125. The optical fiber head 125 is configured to collect the monochromatic ultraviolet light emitted from the monochromatic optimal wavelength LED excitation light source 121. The first optical fiber interface 126 adopts a Straight Tip - Standard Connector (ST-SC) standard optical fiber interface and is configured to guide the monochromatic ultraviolet light emitted from the monochromatic optimal wavelength LED excitation light source 121.

[0022] The workflow for the fluorescence excitation source 12 is as follows: A monochromatic optimal wavelength LED excitation light source 121 emits monochromatic excitation light, which passes through a focusing lens 123 and is focused into an optical fiber head 125 configured to collect the excitation light, and the excitation light is transmitted and output through a first optical fiber interface 126 to excite the transformer oil to generate fluorescence.

[0023] As shown in FIG. 17, the method of selecting the optimum excitation wavelength of the monochromatic optimum wavelength LED excitation light source 121 is as follows.

[0024] First, three-dimensional fluorescence spectrum data of different types of transformer oils was collected. As shown in the excitation wavelength scanning fluorescence spectrum of a new oil sample in Figure 18, it can be found that the fluorescence feature values ​​of the fluorescence spectrum of transformer oil are distributed between the wavelength range of 350 nanometers (nm) and 500 nanometers (nm), and within this range, the fluorescence spectrum can significantly express the characteristics of the sample, that is, the characteristic peaks are clearly distinguishable and regular, and the excitation wavelength range is 270 nm to 310 nm.

[0025] Next, take the excitation wavelength as the abscissa and the main peak intensity as the ordinate, compare the main peak intensity of the sample features at different excitation wavelengths, and then take the excitation wavelength as the abscissa and the coefficient of variation as the ordinate, compare the discreteness of the sample features at different excitation wavelengths. The above-mentioned coefficient of variation is calculated by the following formula: where cv is the coefficient of variation of the fluorescence spectrum data samples of oil samples at different fault times at excitation wavelength v, δ is the sample standard deviation, and μ is the sample average value. The larger the coefficient of variation, the larger the discreteness. The optimal excitation wavelength should satisfy the maximization of both the main peak intensity and the coefficient of variation, and in this way, it can be determined which excitation wavelength has the best effect of fault discrimination.

[0026] As shown in Figures 19 and 20, taking Karamay oil as an example of transformer insulating oil, a three-dimensional fluorescence spectrum analysis test is performed on Karamay oil, an excitation wavelength of 270nm to 310nm is selected, and the main peak intensity and the coefficient of variation are compared. It is found that when the excitation wavelength is 270nm, both are maximum, and therefore the optimal excitation wavelength is 270nm.

[0027] As shown in Figures 21 to 26, the fluorescence excitation detection device 13 includes a detection cell darkroom 1311, a detection cell 1312, a reference cell 1313, an oil inlet pipeline 1314, an oil outlet pipeline 1315, an excitation light emitting optical fiber probe 1316, a fluorescence receiving optical fiber probe 1317, an optical fiber head mover 1318, a stepping motor 1319, an excitation light transmitting optical fiber head 1320, a fluorescence receiving optical fiber head 1321, an excitation light transmitting optical fiber interface 1322, and a fluorescence receiving optical fiber interface 1323.

[0028] The detection cell 1312 and the reference cell 1313 are arranged side by side at the bottom of the detection cell darkroom 1311. One side of the detection cell 1312 is provided with an oil inlet and an oil outlet. The first end of the oil inlet pipe 1314 is hermetically connected to the oil inlet, and the second end of the oil inlet pipe 1314 protrudes to the outside of the detection cell darkroom 1311. The first end of the oil outlet pipe 1315 is hermetically connected to the oil outlet, and the second end of the oil outlet pipe 1315 protrudes to the outside of the detection cell darkroom 1311. The detection cell 1312 and the reference cell 1313 are both sealed containers, the main body of the container is made of stainless steel, and the top of the container is sealed with a visible light-near infrared light quartz glass window piece. The detection cell 1312 is configured to accommodate transformer oil to be detected, and the reference cell 1313 is configured to accommodate a standard solution for calibration. For example, the standard solution may be quinine sulfate, rhodamine solution, or the like.

[0029] The excitation light transmitting optical fiber interface 1322 and the fluorescence receiving optical fiber interface 1323 are provided at the top outside the detection cell darkroom 1311, and first ends of the excitation light transmitting optical fiber interface 1322 and the fluorescence receiving optical fiber interface 1323 are connected to the fluorescence excitation source 12 and the fluorescence detector 141, respectively, and second ends of the excitation light transmitting optical fiber interface 1322 and the fluorescence receiving optical fiber interface 1323 are connected to first ends of the excitation light transmitting optical fiber head 1320 and the fluorescence receiving optical fiber head 1321, which are provided at the top inside the detection cell darkroom 1311, respectively, and second ends of the excitation light transmitting optical fiber head 1320 and the fluorescence receiving optical fiber head 1321 are connected to the excitation light emitting optical fiber probe 1316 and the fluorescence receiving optical fiber probe 1317, respectively.

[0030] The excitation light transmitting optical fiber interface 1322 adopts an ST-SC optical fiber connector and is configured to introduce excitation light, the fluorescence receiving optical fiber interface 1323 adopts an ST-SC optical fiber connector and is configured to extract the excited fluorescence of the transformer oil, the excitation light transmitting optical fiber head 1320 is configured to input the excitation light into the detection cell 1312 or the reference cell 1313, and the fluorescence receiving optical fiber head 1321 is configured to receive the fluorescence excited in the detection cell 1312 or the reference cell 1313.

[0031] The optical fiber head mover 1318 is provided directly above the detection cell 1312 and reference cell 1313 inside the detection cell darkroom 1311, and the optical fiber head mover 1318 employs a traveling structure in which a slider 13181 and a slide bar 13182 work together.

[0032] The above-mentioned excitation light emitting optical fiber probe 1316 and fluorescence receiving optical fiber probe 1317 are respectively arranged on the left and right sides of the slider 13181 of the optical fiber head mover 1318, and the angle between the optical path of the excitation light emitting optical fiber probe 1316 and the optical path of the fluorescence receiving optical fiber probe 1317 is 90 degrees, which minimizes interference of scattered fluorescent light and improves the signal-to-noise ratio.

[0033] The stepping motor 1319 described above is provided on the back panel of the detection cell darkroom 1311, and the stepping motor 1319 is configured to move the slider 13181 of the optical fiber head mover 1318 so that it travels back and forth on the slide bar 13182, thereby simultaneously moving the excitation light emitting optical fiber probe 1316 and the fluorescence receiving optical fiber probe 1317 so that they can be switched between the detection cell 1312 and the reference cell 1313.

[0034] The inner walls of the detection cell darkroom 1311 are coated with a light-absorbing paint to prevent the intrusion of disturbance light and to eliminate the effect of light being reflected multiple times inside.

[0035] The workflow of the transformer oil fluorescence excitation detection device 13 of this embodiment is as follows.

[0036] (1) Equipment calibration If the characteristics of the transformer oil have not changed, the factors that affect the fluorescence intensity of the transformer oil are mainly external factors, such as the attenuation of the light source intensity, temperature, and device response. For accurate quantitative detection, it is necessary to eliminate the influence of external factors. Therefore, it is necessary to calibrate the device to obtain the calibration coefficient of the fluorescence excitation detection device 13, and use the calibration coefficient to correct the fluorescence spectral intensity value of the transformer oil under the current conditions to obtain the real fluorescence spectral intensity value of the transformer oil.

[0037] The process of device calibration is as follows: The fluorescence spectrum intensity value of the standard solution is measured under the standard conditions and the current external conditions, respectively. The detection process is as follows: the stepping motor 1319 moves the optical fiber head mover 1318 to above the reference cell 1313, and the excitation light passes through the excitation light transmitting optical fiber interface 1322, the excitation light transmitting optical fiber head 1320, and the excitation light emitting optical fiber probe 1316 in sequence to enter the reference cell 1313, exciting the standard solution in the reference cell 1313 to generate fluorescence. The excited fluorescence is transmitted and output through the fluorescence receiving optical fiber probe 1317, the fluorescence receiving optical fiber head 1321, and the fluorescence receiving optical fiber interface 1323 in sequence, and the fluorescence spectrum intensity value of the standard solution is measured by the fluorescence detector 141.

[0038] The fluorescence spectrum intensity value of the standard solution measured under standard conditions is P S_S =S S_S t, The fluorescence spectrum intensity value of the standard solution measured under the current external conditions is P S_C =S S_C t, The calibration coefficient of the fluorescence excitation detector 13 thus obtained is R=S S_S / PS_C and Among them, S S_S represents the fluorescence spectrum of the standard solution measured under standard conditions, and S S_C represents the fluorescence spectrum of the standard solution measured under the current external conditions, and t represents the transmittance of the filter of the fluorescence detector 141.

[0039] (2) Detection of the fluorescence spectrum intensity value of transformer oil The fluorescence spectrum intensity value of the transformer oil is measured and obtained under the current external conditions. The detection process is as follows: the stepping motor 1319 moves the optical fiber head mover 1318 above the detection cell 1312, and the excitation light passes through the excitation light transmitting optical fiber interface 1322, the excitation light transmitting optical fiber head 1320, and the excitation light emitting optical fiber probe 1316 in sequence to enter the detection cell 1312, exciting the transformer oil in the detection cell 1312 to generate fluorescence. The excited fluorescence is transmitted and output through the fluorescence receiving optical fiber probe 1317, the fluorescence receiving optical fiber head 1321, and the fluorescence receiving optical fiber interface 1323 in sequence. The fluorescence detector 141 measures and obtains the fluorescence spectrum intensity value of the transformer oil under the current external conditions. The fluorescence spectrum intensity value of the transformer oil under the current external conditions is multiplied by a calibration coefficient to obtain a real fluorescence spectrum intensity value of the transformer oil.

[0040] As shown in Figures 27 to 32, the fluorescent signal collecting and analyzing device 14 comprises a fluorescent signal collecting and analyzing darkroom 140, a fluorescent detector 141, a filter wheel 142, a multivariate correction filter group 143, a filter wheel drive motor 144, a second optical fiber head 145, a second optical fiber interface 146, a fluorescent detector mounting bracket 147, and a filter wheel drive motor mounting bracket 148.

[0041] The fluorescent detector 141 is fixed to a fluorescent detector mounting bracket 147, which is provided on the bottom plate inside the fluorescent signal collection and analysis darkroom 140. The fluorescent detector mounting bracket 147 has a through hole formed therein that is connected to the light receiving lens of the fluorescent detector 141. The light receiving lens of the fluorescent detector 141 is aligned with the through hole. A light absorbing paint is applied to the inner wall of the fluorescent signal collection and analysis darkroom 140 to prevent external light from entering and to eliminate the effects of light being reflected multiple times inside.

[0042] The filter wheel drive motor 144 is fixedly attached to a filter wheel drive motor mounting bracket 148, which is provided on the bottom plate inside the fluorescent signal collection and analysis darkroom 140. The filter wheel 142 is provided between the fluorescent detector 141 and the filter wheel drive motor 144. The filter wheel 142 is fitted onto the rotating shaft of the filter wheel drive motor 144, and the filter wheel drive motor 144 moves the filter wheel 142 to rotate.

[0043] The second optical fiber head 145 is fixedly provided on the side wall at the right end inside the fluorescent signal collecting and analyzing darkroom 140, and the second optical fiber interface 146 is fixedly provided on the side wall at the right end outside the fluorescent signal collecting and analyzing darkroom 140, and the second optical fiber head 145 and the second optical fiber interface 146 are mated and connected.

[0044] 33, the filter wheel 142 is disk-shaped, and a group of multivariate correction filters 143 of a plurality of different wavelengths are attached to the edge of the filter wheel 142. The center lines of the second optical fiber head 145, the group of multivariate correction filters 143, the through hole opened in the fluorescent detector mounting bracket 147, and the light receiving lens of the fluorescent detector 141 are all aligned in a straight line.

[0045] The workflow of the device is as follows: A filter wheel drive motor 144 rotates the filter wheel 142 to switch the multivariate compensation filter group 143 of the corresponding wavelength to align it with the receiving lens of the fluorescence detector 141, and the fluorescence emitted from the transformer oil sequentially passes through a second optical fiber interface 146, a second optical fiber head 145, the multivariate compensation filter group 143 configured to collect and analyze the fluorescence emitted from the transformer oil, a through hole opened in the fluorescence detector mounting bracket 147, and the receiving lens of the fluorescence detector 141 configured to employ a photomultiplier tube to receive the fluorescence emitted from the transformer oil and record the total fluorescence intensity value.

[0046] The method for designing the multivariate correction filter group 143 is as follows: The idea behind the design of the multivariate correction filter is to implement the multivariate linear regression correction coefficient vector for calculating the concentration of aromatic hydrocarbon compounds into hardware, and to design correction filters for both the positive and negative parts, thereby realizing the implementation of the multivariate correction coefficient into hardware.

[0047] The fluorescence spectrum of transformer oil is directly related to the concentration of aromatic hydrocarbon compounds, and the calculation formula for calculating the concentration of aromatic hydrocarbon compounds by adopting multivariate linear regression is:

number

number

[0048] As shown in FIG. 34, the positive and negative parts of the regression correction coefficient vector a are created into two correction filters, that is, the positive and negative coefficients after standardization of the regression correction coefficient vector a are set as the transmittance of the filter.

[0049] Half coefficient a i + and a i - Define a i + and a i - are a i The positive and negative parts of

number

number

number

number

number

[0050] As shown in FIG. 35, the flow of designing the membrane system structure is as follows: the filter transmittance vector t is divided into two parts according to positive and negative values, a positive vector A and a negative vector B are formed, and the absolute value of the negative vector B is taken to obtain vector B2; the positive filter and the negative filter are optimized and designed with vector A and vector B2 as the target, respectively; first, the initial membrane system structure of the filter is selected, and then the thickness of each membrane layer is changed to judge whether the similarity between the filter transmittance and vector A and vector B2 reaches a threshold; if so, the design of the positive filter and the negative filter is completed; if not, judge whether the iteration reaches a preset number of times; if the iteration does not reach the preset number of times, the thickness of each membrane layer is continued to be changed; if the iteration has already reached the preset number of times, the number of layers of the membrane system is increased and then the initial membrane system structure of the filter is reselected.

[0051] Compared with the related art, the present application includes at least the following beneficial effects: (1) The present application provides a transformer oil in a fluorescence excitation detection device 13 that is excited to emit fluorescence by a monochromatic excitation light having an optimal excitation wavelength generated by a fluorescence excitation source 12; the fluorescence excitation detection device 13 generates fluorescence based on the input monochromatic excitation light and injects the fluorescence into a fluorescence signal collection and analysis device 14; the fluorescence signal collection and analysis device 14 employs a multivariate correction filter group 143 to collect the fluorescence signal emitted from the transformer oil and analyze the type of transformer fault; instead of a component called a monochromator emission in a fluorescence spectrometer, the multivariate correction filter group 143 is employed to collect and analyze the fluorescence signal emitted from the transformer oil; thus, the cost of the device is reduced and the device volume is reduced, and the data processing is fast, thereby improving the cost performance of transformer oil fault detection; and a transformer fault diagnosis device is formed that is simplified in structure, portable in volume, and reliable in function, thereby realizing the engineering application of fluorescence monitoring technology in the aspect of transformer fault online diagnosis; (2) In the oil extraction device 11 of the present application, the air pump 114 first draws a vacuum on the internal pipeline of the oil extraction device 11 and the detection cell 1312, thereby avoiding the phenomenon that the impurity gas in the oil extraction device 11 and the fluorescence excitation detection device 13 fills the transformer oil tank and affects the insulation performance of the transformer; and due to the pressure difference between the oil outlet of the transformer oil tank and the detection cell 1312 after the vacuum is drawn, the transformer oil in the transformer oil tank is sucked into the detection cell 1312, at this time the oil extraction pump 113 does not work, thus saving the cost of detection; after the detection is completed, the oil extraction pump 113 sucks out the transformer oil in the detection cell 1312 and pushes it back into the transformer oil tank, thus realizing loss-free detection and avoiding the waste of resources; (3) The fluorescence excitation source 12 of the present application compares the main peak intensity and the degree of discreteness of the sample features at different excitation wavelengths, and selects the excitation wavelength at which both the main peak intensity and the coefficient of variation are maximized 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, which is focused through a focusing lens 123 into an optical fiber head 125 configured to collect the excitation light, and the excitation light is transmitted out through a first optical fiber interface 126 to excite the transformer oil to generate fluorescence. The fault diagnosis device of the present application has a simple structure, and compared with the related art that directly adopts a fluorescence spectrometer for excitation, the volume and weight of the device are greatly reduced and it is easy to use. The fault diagnosis device adopts a monochromatic LED excitation light source, which has a long life and low cost. (4) The fluorescence excitation detection device 13 of the present application is provided with a detection cell 1312 and a reference cell 1313. First, the fluorescence excitation detection device 13 is calibrated using the reference cell 1313, and a calibration coefficient for the fluorescence excitation detection device 13 is calculated. Then, the calibration coefficient is used to correct the fluorescence spectrum intensity value of the transformer oil measured using the detection cell 1312 to obtain a real fluorescence spectrum intensity value of the transformer oil, thereby eliminating interference from external factors and improving the detection accuracy of the fluorescence excitation detection device 13. [Explanation of symbols]

[0052] 10...apparatus housing; 11...oil extraction device; 12...fluorescence excitation source; 13...fluorescence excitation detection device; 14...fluorescence signal acquisition and analysis device; 15...display; 111 ··· oil inlet valve, 112 ··· oil outlet valve, 113 ··· oil extraction pump, 114 ··· air pump, 115 ··· oil inlet two-way joint, 116 ··· oil discharge three-way joint, 117 ··· device bottom plate, 118 ··· mounting bracket, 120: Fluorescence excitation darkroom; 121: Monochromatic optimum wavelength LED excitation light source; 123: Focusing lens; 125: Optical fiber head; 122 ·· ... 1311: detection cell darkroom, 1312: detection cell, 1313: reference cell, 1316: excitation light emitting optical fiber probe, 1317: fluorescence receiving optical fiber probe, 1318: optical fiber head mover, 1320: excitation light transmitting optical fiber head, 1321: fluorescence receiving optical fiber head, 1322: excitation light transmitting optical fiber interface, 1323: fluorescence receiving optical fiber interface, 1314...Oil input pipe, 1315...Oil output pipe, 1319 Stepping motor, 140: Fluorescence signal acquisition and analysis darkroom; 141: Fluorescence detector; 142: Filter wheel; 143: Multivariate correction filter group; 145: Second optical fiber head; 146: Second optical fiber interface; 144···Filter wheel drive motor, 147···Fluorescence detector mounting bracket, 148···Filter wheel drive motor mounting bracket, 13181···Slider, 13182···Slide bar

Claims

1. The present invention comprises an apparatus housing (10), an oil extraction device (11), a fluorescence excitation source (12), a fluorescence excitation detection device (13), a fluorescence signal collection and analysis device (14), all of which are provided inside the apparatus housing (10), and a display (15) provided on a front panel of the apparatus housing (10). The oil extraction device (11) is hermetically connected to the fluorescence excitation detection device (13) and an external transformer oil tank via pipelines, respectively. The fluorescence excitation source (12) is connected to the fluorescence excitation detection device (13) via an optical fiber, and the fluorescence excitation detection device (13) is connected to the fluorescence signal collection and analysis device (14) via an optical fiber. The oil extraction device (11) is connected to the transformer oil tank and the fluorescence excitation detection device (13) after evacuation. The transformer oil in the transformer oil tank is injected into the fluorescence excitation detection device (13) by a pressure difference; the monochromatic excitation light of an optimal excitation wavelength generated by the fluorescence excitation source (12) is used to excite the transformer oil in the fluorescence excitation detection device (13) to generate fluorescence; the fluorescence excitation detection device (13) generates fluorescence based on the input monochromatic excitation light, and inputs the fluorescence to the fluorescence signal collection and analysis device (14); the fluorescence signal collection and analysis device (14) employs a multivariate correction filter group (143) to collect the fluorescence signal emitted from the transformer oil and analyze the type of transformer fault; and the display (15) is configured to display the results collected and analyzed by the fluorescence signal collection and analysis device (14). Fault diagnosis device based on fluorescent multivariate correction analysis of transformer oil.

2. The oil extraction device (11) includes an oil inlet valve (111), an oil outlet valve (112), an oil extraction pump (113), an air pump (114), an oil inlet two-way joint (115), an oil discharge exhaust three-way joint (116), an apparatus bottom plate (117), and a mounting bracket (118). The oil inlet valve (111), the oil outlet valve (112), the oil extraction pump (113), and the air pump (114) are all fixedly attached to the apparatus bottom plate (117). The oil inlet two-way joint (115) and the oil discharge exhaust three-way joint (116) are both fixedly attached to the mounting bracket (118), the mounting bracket (118) is fixedly attached to the bottom plate (117) of the device, the oil extraction pump (113) is configured to suck out the transformer oil after detection is completed from inside the detection cell (1312) of the fluorescence excitation detection device (13), and the air pump (114) is configured to suck out the transformer oil after detection is completed from inside the detection cell (1312) of the fluorescence excitation detection device (13). The oil inlet valve (111) is configured to suck out impurity gases from the internal pipeline of the oil inlet tank (11) and from the detection cell (1312) of the fluorescence excitation detection device (13), and a first end of the oil inlet valve (111) is connected to the oil outlet of the transformer oil tank, a second end of the oil inlet valve (111) is connected to the first end of the oil inlet two-way joint (115), a second end of the oil inlet two-way joint (115) is connected to the oil inlet of the fluorescence excitation detection device (13), and a first end of the oil extraction pump (113) is connected to the oil outlet of the transformer oil tank (11). a first end of the oil extraction pump (113) connected to a first port of the oil exhaust three-way joint (116), a second end of the oil extraction pump (113) connected to an oil outlet of the fluorescence excitation detection device (13), a second port of the oil exhaust three-way joint (116) connected to a first end of the oil outlet valve (112), a second end of the oil outlet valve (112) connected to an oil inlet of the transformer oil tank, and a third port of the oil exhaust three-way joint (116) connected to one end of the air pump (114). A fault diagnosis device based on the fluorescent multivariate correction analysis of transformer oil according to claim 1.

3. The workflow of the oil extraction device (11) is as follows: evacuating the internal pipelines of the oil extraction device (11) and the detection cell (1312), by turning off the oil inlet valve (111) and the oil outlet valve (112), setting the oil extraction pump (113) to a normal open mode, and starting the air pump (114) to evacuate the internal pipelines of the oil extraction device (11) and the detection cell (1312); and after the evacuation is completed, setting the oil extraction pump (113) to a blocking mode and turning off the air pump (114); Injecting the transformer oil into the detection cell (1312) by turning on the oil inlet valve (111) and injecting the transformer oil in the transformer oil tank into the detection cell (1312) by the pressure difference between the oil outlet of the transformer oil tank and the detection cell (1312) after evacuation, and turning off the oil inlet valve (111) after the oil inlet is completed; After the detection is completed, turning on the oil outlet valve (112), setting the air pump (114) to a blocking mode, and starting the oil extraction pump (113) to suck out the transformer oil in the detection cell (1312) and push it back into the transformer oil tank, thereby returning the transformer oil to fill the transformer oil tank. A fault diagnosis device based on the fluorescent multivariate correction analysis of transformer oil according to claim 2.

4. the fluorescence excitation source (12) comprises a fluorescence excitation darkroom (120), a monochromatic optimal wavelength LED excitation light source (121), a focusing lens (123), an optical fiber head (125), and a first optical fiber interface (126), the monochromatic optimal wavelength LED excitation light source (121), the focusing lens (123), and the optical fiber head (125) are all fixedly installed inside the fluorescence excitation darkroom (120), the focusing lens (123) is installed between the monochromatic optimal wavelength LED excitation light source (121) and the optical fiber head (125), and center lines of the monochromatic optimal wavelength LED excitation light source (121), the focusing lens (123), and the first optical fiber interface (126) are aligned in a straight line; A fault diagnosis device based on the fluorescent multivariate correction analysis of transformer oil according to claim 2.

5. the fluorescence excitation source (12) further comprises an excitation light source mounting bracket (122) and a lens mounting bracket (124), the excitation light source mounting bracket (122) is fixed to a bottom plate inside the fluorescence excitation darkroom (120), the monochromatic optimum wavelength LED excitation light source (121) is attached to the excitation light source mounting bracket (122), the lens mounting bracket (124) is fixed to a bottom plate inside the fluorescence excitation darkroom (120), the focusing lens (123) is fitted into the lens mounting bracket (124), the first optical fiber interface (126) is fixed to a side wall outside the fluorescence excitation darkroom (120), and the optical fiber head (125) is mated and connected to the first optical fiber interface (126). A fault diagnosis device based on the fluorescent multivariate correction analysis of transformer oil according to claim 4.

6. The fluorescence excitation detection device (13) includes a detection cell darkroom (1311), a detection cell (1312), a reference cell (1313), an excitation light emitting optical fiber probe (1316), a fluorescence receiving optical fiber probe (1317), an optical fiber head mover (1318), an excitation light transmitting optical fiber head (1320), a fluorescence receiving optical fiber head (1321), an excitation light transmitting optical fiber interface (1322), and a fluorescence receiving optical fiber interface (1323). are arranged side by side at the bottom of a detection cell darkroom (1311), the detection cell (1312) is configured to accommodate transformer oil to be detected, the reference cell (1313) is configured to accommodate a standard solution for calibration, the excitation light transmitting optical fiber interface (1322) and the fluorescence receiving optical fiber interface (1323) are provided at the top outside the detection cell darkroom (1311), and the first of the excitation light transmitting optical fiber interface (1322) and the fluorescence receiving optical fiber interface (1323) The first ends of the excitation light transmitting optical fiber interface (1322) and the fluorescence receiving optical fiber interface (1323) are connected to the first ends of the excitation light transmitting optical fiber head (1320) and the fluorescence receiving optical fiber head (1321) provided inside the detection cell darkroom (1311), respectively, and the second ends of the excitation light transmitting optical fiber head (1320) and the fluorescence receiving optical fiber head (1321) are connected to the front ends of the detection cell darkroom (1311). The optical fiber head mover (1318) is connected to the excitation light emitting optical fiber probe (1316) and the fluorescence receiving optical fiber probe (1317), and is provided above the detection cell (1312) and the reference cell (1313) inside the detection cell darkroom (1311). The excitation light emitting optical fiber probe (1316) and the fluorescence receiving optical fiber probe (1317) are provided on both sides of the optical fiber head mover (1318), respectively. The optical fiber head mover (1318) simultaneously:moving said excitation light emitting fiber optic probe (1316) and said fluorescence receiving fiber optic probe (1317) so as to be switchable between said detection cell (1312) and said reference cell (1313); A fault diagnosis device based on the fluorescent multivariate correction analysis of transformer oil according to claim 1.

7. The fluorescence excitation detection device (13) comprises: the optical fiber head mover (1318) is moved above the detection cell (1312), and the excitation light passes through the excitation light transmitting optical fiber interface (1322), the excitation light transmitting optical fiber head (1320) and the excitation light emitting optical fiber probe (1316) in sequence to enter the detection cell (1312), exciting the transformer oil in the detection cell (1312) to generate fluorescence; The excited fluorescence is transmitted through the fluorescence receiving optical fiber probe (1317), the fluorescence receiving optical fiber head (1321) and the fluorescence receiving optical fiber interface (1323) in sequence, and the fluorescence detector (141) measures and obtains the fluorescence spectrum intensity value of the transformer oil under the current external conditions, and multiplies the fluorescence spectrum intensity value of the transformer oil under the current external conditions by the calibration coefficient of the fluorescence excitation detection device (13) to obtain the real fluorescence spectrum intensity value of the transformer oil. The fluorescent spectrum intensity value of the transformer oil is detected by the above method. A fault diagnosis device based on the fluorescent multivariate correction analysis of transformer oil according to claim 6.

8. The calibration coefficient of the fluorescence excitation detection device (13) is Measure and obtain the fluorescence spectrum intensity value of the standard solution under the standard condition and the current external condition, respectively, and move the optical fiber head mover (1318) above the reference cell (1313), so that the excitation light passes through the excitation light transmitting optical fiber interface (1322), the excitation light transmitting optical fiber head (1320) and the excitation light emitting optical fiber probe (1316) in sequence and enters the reference cell (1313), exciting the standard solution in the reference cell (1313) to generate fluorescence; The excited fluorescence is transmitted through the fluorescence receiving optical fiber probe (1317), the fluorescence receiving optical fiber head (1321) and the fluorescence receiving optical fiber interface (1323) in sequence, and is outputted, and the fluorescence spectrum intensity value of the standard solution is measured by the fluorescence detector (141). It is determined by the method The fluorescence spectrum intensity value of the standard solution measured under standard conditions is P Ｓ＿Ｓ = S Ｓ＿Ｓ t, and the fluorescence spectrum intensity value of the standard solution measured under the current external conditions is P Ｓ＿Ｃ = S Ｓ＿Ｃ t, and the calibration coefficient of the fluorescence excitation detection device (13) obtained is R=S Ｓ＿Ｓ / P Ｓ＿Ｃ and S Ｓ＿Ｓ represents the fluorescence spectrum of the standard solution measured under standard conditions, and S Ｓ＿Ｃ represents the fluorescence spectrum of the standard solution measured under the current external conditions, and t represents the transmittance of the filter of the fluorescence detector (141); A fault diagnosis device based on the fluorescent multivariate correction analysis of transformer oil according to claim 7.

9. The angle between the optical path of the excitation light emitting optical fiber probe (1316) and the optical path of the fluorescence receiving optical fiber probe (1317) is 90 degrees. A fault diagnosis device based on the fluorescent multivariate correction analysis of transformer oil according to claim 6.

10. The fluorescence excitation detection device (13) further includes an oil inlet pipeline (1314) and an oil outlet pipeline (1315), and an oil inlet and an oil outlet are provided on one side of the detection cell (1312). The first end of the oil inlet pipeline (1314) is sealed and connected to the oil inlet, and the second end of the oil inlet pipeline (1314) protrudes outside the detection cell darkroom (1311). The first end of the oil outlet pipeline (1315) is sealed and connected to the oil outlet, and the second end of the oil outlet pipeline (1315) protrudes outside the detection cell darkroom (1311). A fault diagnosis device based on the fluorescent multivariate correction analysis of transformer oil according to claim 6.

11. The fluorescence excitation detection device (13) further includes a stepping motor (1319), and the optical fiber head mover (1318) adopts a traveling structure in which a slider (13181) and a slide bar (13182) cooperate with each other, and the excitation light emitting optical fiber probe (1316) and the fluorescence receiving optical fiber probe (1317) are respectively provided on both the left and right sides of the slider (13181) of the optical fiber head mover (1318), and the stepping motor (1319) ) is provided on the back plate of the detection cell darkroom (1311), and the stepping motor (1319) is configured to move the slider (13181) of the optical fiber head mover (1318) so as to travel back and forth on a slide bar (13182), thereby simultaneously moving the excitation light emitting optical fiber probe (1316) and the fluorescence receiving optical fiber probe (1317) so as to be switched between the detection cell (1312) and the reference cell (1313). The fault diagnosis device based on the fluorescent multivariate correction analysis of transformer oil according to claim 10.

12. The fluorescent signal acquisition and analysis device (14) comprises a fluorescent signal acquisition and analysis darkroom (140), a fluorescent detector (141), a filter wheel (142), a multivariate correction filter group (143), a second optical fiber head (145), and a second optical fiber interface (146). The fluorescent detector (141) and the filter wheel (142) are both provided inside the fluorescent signal acquisition and analysis darkroom (140), and the multivariate correction filter group (143) comprises a pair of positive multivariate correction filters and a negative multivariate correction filter that are used in conjunction with each other. The multivariate correction filter group (143) is attached to the filter wheel (142), the filter wheel (142) is rotatably provided between the fluorescence detector (141) and the second optical fiber head (145), the second optical fiber head (145) is provided on the inner side wall of the fluorescence signal collection and analysis darkroom (140), and the second optical fiber interface (146) is provided on the outer side wall of the fluorescence signal collection and analysis darkroom (140). The second optical fiber head (145) and the second optical fiber interface (146) are mated and connected, the fluorescence receiving optical fiber interface (1323) is connected to the second optical fiber interface (146) via an optical fiber, the fluorescence detector (141) is configured to receive the fluorescence signal emitted from the transformer oil and record the total fluorescence intensity value, and the multivariate correction filter group (143) is configured to collect and analyze the fluorescence signal emitted from the transformer oil, and is used During use, by rotating the positive multivariate compensation filter or the negative multivariate compensation filter to a predetermined position, the center lines of the second optical fiber head (145), the positive multivariate compensation filter or the negative multivariate compensation filter, and the light receiving lens of the fluorescent detector (141) are aligned in a straight line, and the fluorescent light emitted from the transformer oil passes through the second optical fiber interface (146), the second optical fiber head (145), the positive multivariate compensation filter or the negative multivariate compensation filter, and the light receiving lens of the fluorescent detector (141) in this order. A fault diagnosis device based on the fluorescent multivariate correction analysis of transformer oil according to claim 6.

13. The fluorescent signal collecting and analyzing device (14) further comprises a filter wheel drive motor (144), a fluorescent detector mounting bracket (147), and a filter wheel drive motor mounting bracket (148). The fluorescent detector mounting bracket (147) is provided on a bottom plate inside the fluorescent signal collecting and analyzing darkroom (140). The fluorescent detector (141) is fixedly mounted on the fluorescent detector mounting bracket (147). The fluorescent detector mounting bracket (147) has a through hole connected to a light receiving lens of the fluorescent detector (141). the light receiving lens of the fluorescence detector (141) is aligned with the through hole, the filter wheel drive motor (144) is fixedly attached to the filter wheel drive motor mounting bracket (148), the filter wheel drive motor mounting bracket (148) is provided on a bottom plate inside the fluorescence signal collection and analysis darkroom (140), the filter wheel (142) is fitted onto a rotating shaft of the filter wheel drive motor (144), and the filter wheel drive motor (144) moves the filter wheel (142) to rotate; A fault diagnosis device based on the fluorescent multivariate correction analysis of transformer oil according to claim 12.

Images