CN114964952A - System and method for detecting and analyzing solid particles in transformer insulating oil - Google Patents

Abstract

The invention provides a system and a method for detecting and analyzing solid particles in transformer insulating oil, which comprises a filtering device, wherein the filtering device comprises a shell and a cover body, an upper partition plate is arranged in the shell, an installation through hole is formed in the upper partition plate, a funnel is arranged in the installation through hole, a sample bottle positioning ring is arranged at the upper part of the funnel, a jack post is arranged at the center of the sample bottle positioning ring, a sample bottle is arranged in the sample bottle positioning ring, the sample bottle comprises a bottle body and a bottom cover connected to the bottom of the bottle body, a leakage channel is arranged on the bottom cover, an elastic mechanical switch assembly is arranged at the leakage channel, a dragging handle is arranged below the funnel and comprises an upper boss, a middle flange and a lower boss, the upper boss is used for placing a filter membrane, and the lower boss is used for connecting a vacuum bottle. The invention has the advantages of high efficiency and high automation degree during sample pretreatment, can quickly detect the components and the microscopic morphology of particles in the insulating oil, and helps workers to quickly determine the source of particle pollutants.

Description

System and method for detecting and analyzing solid particles in transformer insulating oil

Technical Field

The invention mainly relates to the technical field related to transformer maintenance, in particular to a system and a method for detecting and analyzing solid particles in insulating oil.

Background

The insulating oil in the transformer is prepared by distilling and refining natural petroleum, and has the advantages of small viscosity, good insulating property, good cooling property and the like. The insulating oil is complex in components, the main components of the insulating oil are compounds such as alkane, cycloalkane and aromatic hydrocarbon, the insulating oil has high dielectric breakdown voltage, the insulating oil mainly plays roles in heat dissipation and cooling, insulation protection and arc extinction in the operation process of equipment such as a transformer, a reactor or a mutual inductor, and the quality of the insulating oil is directly related to the safe and stable operation of the equipment.

The impurity particles in the insulating oil are particles which are invaded into the oil and are insoluble in the oil, are also called particle pollution degree, and mainly comprise fiber, carbon and various metal impurity particles. The following forms are mainly adopted: inherent foreign particles, contamination of the medium, impurities generated during operation of the transformer, etc.

The pollutant particles are subjected to dielectrophoretic force under the action of the non-uniform electric field to move towards the high electric field area, and can form solid particle bridges within a period of time, so that the electrical performance of the insulating oil can be greatly influenced. Therefore, in order to ensure stable operation of equipment such as a transformer, a reactor, or a transformer, it is necessary to detect impurity particle contaminants in the insulating oil.

At present, particle pollutants in insulating oil are mainly detected through inductively coupled plasma atomic emission spectroscopy and atomic absorption spectroscopy, and the two methods can only realize the determination of the content of metal elements, can not determine non-metal elements and can not know the specific components and the microscopic morphology of the particle pollutants. In addition, the pretreatment of detecting the sample needs to filter granule in the insulating oil, and the tradition adopts manual mode more, operates through funnel and filter membrane, and its inefficiency, and the process is comparatively loaded down with trivial details.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a system and a method for detecting and analyzing solid particles in insulating oil by combining the prior art and starting from practical application, and the system and the method have the advantages of high efficiency and high automation degree during sample pretreatment, can quickly detect the components and the microscopic morphology of the particles in the insulating oil and help workers to quickly determine the source of particle pollutants.

The technical scheme of the invention is as follows:

according to one aspect of the invention, the system for detecting and analyzing the solid particles in the transformer insulating oil comprises a filter device, wherein the filter device comprises a shell and a cover body which can be turned and opened, an upper partition plate is arranged in the shell, an installation through hole is formed in the upper partition plate, a funnel is arranged in the installation through hole, and the funnel and the partition plate are connected through an elastic mechanical support assembly to enable the funnel to move up and down and reset;

the funnel is characterized in that a sample bottle positioning ring is arranged at the upper part of the funnel, a top column is arranged at the center of the sample bottle positioning ring, a sample bottle is installed in the sample bottle positioning ring, the sample bottle comprises a bottle body and a bottom cover connected to the bottom of the bottle body, a liquid leakage channel is arranged on the bottom cover, an elastic mechanical switch assembly is arranged at the liquid leakage channel, and the liquid leakage channel can be opened under the action of the top column when the sample bottle moves downwards;

a dragging handle is arranged below the funnel and comprises an upper boss, a middle flange and a lower boss, the upper boss is used for placing a filter membrane, the lower boss is used for connecting a vacuum bottle, a vacuum channel is arranged on the dragging handle, and the vacuum channel is communicated with a vacuum source arranged in the shell;

the utility model discloses a filter membrane filter, including lid, stirring shaft, pressure head, vacuum flask, filter membrane centre gripping, elevating system, the lid is connected to the lid, is equipped with a pressure head on the lid, install the (mixing) shaft on the pressure head, agitator shaft connection agitator motor, the pressure head position corresponds with the vacuum flask when the lid is closed, and when elevating system drive lid downstream, the pressure head is to the sample bottle application of force, makes the sample bottle open with the funnel intercommunication, makes the funnel remove the back downwards simultaneously and cooperates with the upper convex platform with the filter membrane centre gripping fixed, and when elevating system reset, sample bottle, funnel reset thereupon.

Further, the bottom of the bottom cover is provided with a groove, the elastic mechanical switch assembly comprises a plug used for plugging the leakage channel, a driving block is connected to the middle of the bottom of the plug, first connecting rods are arranged on two sides of the driving block, a first guide rod is fixedly arranged in the groove, the first connecting rods are in sliding fit with the first guide rod, a first spring which applies force to the first connecting rods downwards is arranged on the first guide rod, and the driving block and the first connecting rods are located in the groove.

Further, the elastic mechanical support assembly comprises a flange plate and a second guide rod; the flange plate is fixedly connected to the funnel main body, one end of the second guide rod is fixedly connected with the flange plate, the other end of the second guide rod is in sliding fit with the guide hole formed in the upper partition plate, and a second spring which applies force to the flange plate towards the upper side is arranged on the second guide rod.

Furthermore, the top column is supported by a plurality of second connecting rods fixed on the inner wall of the funnel.

Further, go up the boss top surface and the funnel bottom surface all is provided with the sealing washer.

Further, a liquid tank and a pressure pump are arranged in the shell, and the liquid tank is used for storing flushing liquid;

the pressure head is also provided with a plurality of spray heads which are communicated with the liquid tank through hoses;

and a liquid discharge channel is arranged at the bottom of the vacuum bottle, and a liquid discharge valve is arranged on the liquid discharge channel.

Furthermore, an opening at one end of the vacuum channel is arranged on the bottom surface of the lower boss, an opening at the other end of the vacuum channel is arranged on the middle flange, a pipeline is arranged at the middle flange and connected to a vacuum source, and a tee joint and an air inlet valve are arranged on the pipeline.

Furthermore, the filtration equipment also comprises a filter membrane frame, wherein the filter membrane frame comprises a handheld plate and clamping arms at two sides, and the clamping arms are provided with supporting grooves for placing filter membranes;

one side of the shell is provided with a sliding groove for the filter membrane frame to slide, and the filter membrane is arranged on the filter membrane frame and then can be pushed to the upper boss by the sliding groove.

Further, a microscopic imaging device is included for analyzing the particles filtered on the filter membrane.

According to another aspect of the invention, a method for detecting and analyzing solid particles in transformer insulating oil is provided, which comprises the following steps:

s1, filtering the quantitative insulating oil through the filtering equipment of the detection and analysis system, separating solid particles in the insulating oil to a filter membrane, and moving the filter membrane to a watch glass;

s2, counting the number of particles, the size of the particles and the pixel content of the particles in the quantitative oil product by using a microscopic analyzer, calculating the equivalent area circle and the equivalent sphere volume of each particle to obtain the equivalent area diameter, the equivalent sphere volume diameter and the circularity parameter of the particles, carrying out classification statistics on all the particles to obtain the particle size distribution and circularity distribution information, and determining the actual components of the particle pollutants based on the analysis information.

The invention has the beneficial effects that:

1. in the solid particle detection and analysis system, the design automation degree of the filtering equipment is high, and in the actual use process, an operator only needs to put the filter membrane at a proper position, and the equipment can realize the automatic filtering of the solid particles in the sample oil, so that the preparation efficiency can be greatly improved, the labor intensity of manpower is reduced, the particles can be uniformly distributed on the filter membrane, and the consistency of the detection effect is ensured in the early-stage preparation process of the sample.

2. According to the invention, the whole structure of the filtering device is compact and reasonable in design, in the actual operation process, the filter membrane and the sample bottle are placed, after the device is started, the sample bottle can be automatically opened under the action of the lifting mechanism, meanwhile, the automatic compaction of the filter membrane is also realized, the automatic filtration of sample oil is realized after the vacuum source is started, and after the filtration is finished, the particulate matters are retained on the filter membrane, so that the filter membrane is only required to be taken out for direct analysis, and the device is suitable for popularization and application in detection and analysis of solid particles in insulating oil.

3. According to the invention, the flushing fluid system is configured, so that the sample oil can be automatically diluted, the stirring structure is also configured, the mixing effect of the sample oil and the flushing fluid is improved, the liquid can be automatically discharged after the experiment is completed, so that the equipment can be recovered to the initial state, and compared with the complexity of the traditional sample preparation in the early stage, the structure can obviously reduce the complexity of the operation.

4. The particle analysis method provided by the invention adopts a microscopic imaging mode, is suitable for appearance observation and particle size analysis of conventional fault particles (such as copper, iron, silicon, oil sludge, carbon deposition, fibers, organic matters and the like) in oil, and observation and test of surface structures of various lighttight objects (such as cellulose) in the oil, can quickly detect the components and microscopic forms of particle pollutants in insulating oil, and helps workers to quickly determine the source of the particle pollutants.

Drawings

FIG. 1 is a schematic diagram I of the general structure of a filtering device;

FIG. 2 is a schematic diagram of the overall structure of the filtration apparatus II;

FIG. 3 is a schematic view of an open state of the filter apparatus;

FIG. 4 is a schematic view of the internal structure of the filtration apparatus;

FIG. 5 is a schematic view of a partial housing construction of the filtration apparatus;

FIG. 6 is a first schematic view of a funnel and a mop handle;

FIG. 7 is a schematic view of a funnel and a mop handle;

FIG. 8 is a schematic view of the structure of the membrane module;

FIG. 9 is a schematic view of a sample vial configuration;

FIG. 10 is a schematic diagram of a cross-sectional structure of a sample bottle;

FIG. 11 is a bottom cover structure diagram;

FIG. 12 is a flow chart of a filtration treatment and microanalysis of a sample of solid particles in insulating oil;

FIG. 13 is a flow chart of microscopic image analysis of particles in insulation;

FIG. 14 is a schematic illustration of the particle morphology and appearance distribution and analysis in oil;

FIG. 15 is a statistical representation of particle size and distribution in oil.

Reference numerals shown in the drawings:

1. a housing; 2. a cover body; 3. a filter membrane assembly; 4. a sample bottle; 5. a liquid storage tank; 6. a vacuum bottle; 7. a funnel; 8. a mop handle; 9. a vacuum source;

11. an upper partition plate; 12. mounting a through hole; 13. a guide hole; 14. a sliding groove;

21. a lifting mechanism; 22. a stirring motor; 23. a pressure head; 24. a stirring shaft; 25. a nozzle; 26;

31. filtering the membrane; 32. a filter membrane frame;

41. a bottle body; 42. a bottom cover; 43. a plug; 44. a drive block; 45. a first link; 46. a first guide bar; 47. a first spring; 48. a leakage path; 49. an open slot;

61. a drain valve;

71. a sample bottle positioning ring; 72. a flange plate; 73. a second spring; 74. a second guide bar; 75. a top pillar; 76. a second link;

81. an upper boss; 82. a middle flange; 83. a lower boss; 84. a vacuum channel;

91. an intake valve.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.

Example 1:

the embodiment provides a system for detecting and analyzing solid particles in transformer insulating oil, in particular to a filtering device for early sample preparation and an instrument for analyzing a sample in the detection and analysis system.

In this embodiment, the main structure of the filter device is shown in fig. 1 to 11. The novel multifunctional cover mainly comprises a shell 1 and a cover body 2 capable of being turned and opened, wherein the cover body 2 is arranged on one side of the shell 1, and the cover body 2 is connected with the shell 1 in a hinged mode to achieve opening and closing of the cover body 2.

As shown in the figure, an upper partition plate 11 is arranged inside the casing 1, the upper partition plate 11 divides the upper part of the casing 1 into an upper installation cavity and a lower installation cavity, an installation through hole 12 is arranged on the upper partition plate 11 (for the convenience of arrangement of parts, the installation through hole 12 is positioned at one side inside the casing 1), a funnel 7 is arranged in the installation through hole 12, the funnel 7 is connected with the partition plate 11 through an elastic mechanical support component, so that the funnel 7 can move up and down and reset, the upper partition plate 11 is mainly used for supporting the funnel 7, the installation through hole 12 is used for providing an up-and-down moving space for the funnel 7, the funnel 7 is designed into a vertically movable structure, and is mainly used for forming a certain gap between the funnel 7 and a lower mop handle 8 when the funnel 7 is positioned at the upper part, so as to put the filter membrane 32 in, and the funnel 7 can be matched with the mop handle 8 to clamp and fix the filter membrane 32 after moving downwards, so that the particles in the sample oil are filtered through the filter membrane 32.

A sample bottle positioning ring 71 is arranged on the upper part of the funnel 7, and a top column 75 is arranged at the center of the sample bottle positioning ring 71. The sample bottle positioning ring 71 is mainly used for placing the sample bottle 4. The sample bottle 4 is designed to be opened by the top pillar 75, and includes a bottle body 41 and a bottom cover 42 connected to the bottom of the bottle body 41, a leakage path 48 is formed on the bottom cover 42, and an elastic mechanical switch assembly is disposed at the leakage path 48. In the above-mentioned structure, after the sample oil is injected into the sample bottle 4, the sample oil does not flow out because the bottom cover 42 is in the closed state, and when the top pillar 75 applies a force to the elastic mechanical switch assembly at the bottom cover 42, the bottom cover 42 is opened, and the sample oil can flow out from the bottom.

Set up in the below of funnel 7 and drag handle 8, drag handle 8 mainly includes boss 81, well flange 82 and lower boss 83, set up the liquid channel in the middle of drag handle 8, it is used for placing filter membrane 32 to go up boss 81, it is specific, the diameter of going up boss 81 should be less than the diameter of filter membrane 32 so that placing of filter membrane 32, go up boss 81 and lower boss 83 and directly connect through well flange 82, lower boss 83 inserts in the vacuum flask 6 of below, the one side that lies in integrative passageway on lower boss 83 is provided with vacuum channel 84, the other end of this vacuum channel 84 sets up in well flange 82 one side, and set up the vacuum source 9 in casing 1 through the pipeline intercommunication, in order to facilitate evacuation and release vacuum, this embodiment has set up corresponding tee bend and admission valve 91 on the pipeline.

In this embodiment, the external driving structure is designed on the cover 2, so that the compactness of the whole device can be ensured. Specifically, the bottom of the cover 2 is connected to a lifting mechanism, which is mainly used to push the cover 2 to move up and down (in order not to affect the turning motion of the cover 2, a movable plate driven by the lifting mechanism is arranged at the rear side of the housing 1, and the cover 2 is hinged to the movable plate), and the lifting mechanism can be driven by an electric cylinder or other linear units. A pressure head 23 is arranged on the cover body 2, a stirring shaft 24 is arranged on the pressure head 23, and the stirring shaft 24 is connected with the stirring motor 22 (in order to make the structure more compact, the stirring motor 22 can be arranged outside the cover body 2 as shown in the figure). The ram 23 is designed primarily to drive the sample vial 4 downward. As described above, when the sample bottle 4 is driven to move downward by an external force, the sample bottle 4 can be automatically opened by the top pillar 75, and the funnel 7 can be driven by the external force.

As a preferred structure of this embodiment, a slot 49 is provided at the bottom of the bottom cover 42 (mainly for hiding the elastic mechanical switch assembly), and the elastic mechanical switch assembly is designed as follows: the liquid leakage device comprises a plug 43 for plugging the liquid leakage channel 48 (in order to ensure sealing performance, the liquid leakage channel 48 and the plug 32 can be designed to be of a corresponding conical structure), a driving block 44 is connected to the middle of the bottom of the plug 43 and is mainly used for being matched with a support pillar 75, a first connecting rod 45 is arranged on each of two sides of the driving block 44, a first guide rod 47 is fixedly arranged in a groove 49, the first connecting rod 45 is in sliding fit with the first guide rod 47, a first spring 47 for applying force to the first connecting rod 45 downwards is arranged on the first guide rod 47, the first connecting rod 45 is adopted to enable the driving block 44 to be connected with the first guide rod 47, and liquid can flow out through gaps between the first connecting rods 45 conveniently. In the structure, under the action of no external force, after the sample bottle 4 is placed on the sample bottle positioning ring 71, the driving block 44 is in contact with the top column 75, when no external force exists, at the moment, under the action of the first spring 47, the driving block 44 is at the bottommost position, the bottom cover 42 is in a closed state, and when the cover body 2 moves downwards, force is applied to the sample bottle 4, due to the limiting effect of the top column 75, the driving block 44 is pushed to move upwards to compress the first spring 47, the plug 43 moves upwards to open the liquid leakage channel 48, liquid can flow out through the liquid leakage channel 48, and meanwhile, under the action force of the sample bottle 4, the funnel 7 can be pressed to move downwards until the bottom of the funnel is in contact with the dragging handle 8.

Meanwhile, in the present embodiment, as a preferred structure of the elastic mechanical support assembly, it is designed as follows: comprises a flange plate 72 and a second guide rod 74; the flange 72 is fixedly connected to the main body of the hopper 7, one end of the second guide rod 74 is fixedly connected to the flange 72, the other end is slidably fitted into the guide hole 13 formed in the upper partition plate 11, and the second guide rod 74 is provided with a second spring 73 for applying force to the flange 72 upward. In the above structure, the funnel 7 is always biased by the second spring 73 to the uppermost position without any external force, and a gap for placing the filter membrane 32 is formed between the bottom of the funnel and the handle 8, and the funnel 7 is moved downward as a whole when the funnel is pressed by the sample bottle 4.

As shown in fig. 7, in the present embodiment, the top pillar 75 is supported by three second links 76 fixed to the inner wall of the funnel 7, and the liquid flows out through the gaps between the second links 76.

In order to ensure the sealing effect of the filtering device, sealing rings can be arranged on the top surface of the upper boss 81 and the bottom surface of the funnel 7.

When filtering sample oil, in order to guarantee the filter effect, should use pollution-free flush fluid at first to dilute sample oil, finish the experiment with the in-process, also can rinse and erode the container through the flush fluid, avoid the particulate matter to be detained and influence the testing result on the container. In order to realize the full-automatic filtration of the device, a liquid tank 5 and a pressure pump are also arranged in the shell 1, wherein the liquid tank 5 is used for storing washing liquid, and the pressure pump is used for providing high pressure. Simultaneously, set up a plurality of shower nozzle 23 on pressure head 3, with shower nozzle 23 through hose and liquid tank 5 intercommunication, pour into flush fluid into shower nozzle 23 department through the force (forcing) pump, by the blowout of shower nozzle 23, and then enter into in the sample bottle. Meanwhile, a liquid discharge channel is arranged at the bottom of the vacuum bottle 6, a liquid discharge valve 61 is arranged on the liquid discharge channel, and waste liquid after the experiment is finished is discharged through the liquid discharge valve 61.

Furthermore, in this embodiment, in order to facilitate the use of the device and the taking and putting of the filter membrane 32, the filter membrane 32 is mounted on a filter membrane holder 31, and the filter membrane 32 can be accurately and conveniently put into a proper position from the outside of the housing 1 through the filter membrane holder 31. Specifically, as shown in the figure, the filter membrane holder 32 comprises a hand-held plate and clamping arms at two sides, wherein a support groove for placing the filter membrane 32 is arranged on the clamping arms (the distance between the clamping arms at two sides is slightly larger than the diameter of the upper boss 81 and the bottom of the funnel 7); at the same time, a slide groove 14 for sliding the filter holder 32 is provided on the housing 1 side. When the filter membrane 32 is installed, the filter membrane is firstly placed on the filter membrane frame 31 through tweezers, and then the filter membrane frame 31 is plugged into the sliding groove 14, and at the moment, the filter membrane 31 is just placed at the middle position of the upper boss 81.

In this embodiment, the main workflow and principle of the filtering apparatus are as follows.

1) Firstly, injecting sample oil into a sample bottle 4, opening the cover body 2, placing the sample bottle 4 into the sample bottle positioning ring 71, and then closing the cover body 2, wherein the bottom surface of the pressure head 23 just contacts with the top of the sample bottle 4;

2) the filter membrane 32 is taken out from the filter membrane box, placed on the filter membrane holder 31 by tweezers, and the filter membrane holder 31 is inserted into the sliding groove 14;

3) opening a pressure pump and a stirring motor 22 of the liquid tank 5, spraying flushing liquid into the sample bottle 4 through a spray head 25, rotating a stirring shaft 24 to dilute sample oil by the flushing liquid, and stopping the pressure pump and the stirring motor 22 after a certain time;

4) starting the lifting mechanism to move the cover body 2 downwards, wherein the pressure head 23 presses the sample bottle 4 to move downwards, the leakage channel 48 of the bottom cover 42 is opened, and the funnel 7 moves downwards and is pressed on the filter membrane 31;

5) starting a vacuum source 9 to vacuumize the vacuum bottle 6, enabling liquid in the sample bottle 4 to sequentially flow into the vacuum bottle 6 through the funnel 7, the filter membrane 32 and the mop 8 under the action of vacuum, enabling particles in the sample oil to be retained on the filter membrane 32, and after one cycle, starting the pressure pump of the liquid tank 5 again to enable the washing liquid to wash the sample bottle so as to avoid the particles from being left on the container;

6) starting the lifting mechanism again to enable the cover body 2 to move upwards, resetting the sample bottle 4 and the funnel 7, and taking out the filter membrane frame 32 to obtain particles in the sample oil;

7) the waste liquid is discharged through the drain valve 61.

For the above steps, uniformly distributed particulate matter is obtained on the filter membrane 31, the filter membrane 31 is moved to a watch glass, and the particles are analyzed and counted by a micro-imager to obtain the size and type of the particles, so as to judge the actual composition of the particles.

Example 2:

this example provides a method of analysing the particles obtained in example 1 above.

In this embodiment:

the basic parameters of the microscopic imaging instrument are as follows:

measurement range: 1-3,000 micrometers;

repeatability error: < 3% (no errors due to sample preparation factors included);

a digital camera: 300 ten thousand pixels

Maximum optical magnification: 1600 times of

Total magnification of the system: 5000 times and the maximum optical magnification of 1600 times

Maximum resolution: 0.1 micron/pixel;

the digital camera basic parameters are as follows:

pixel size: 3.2 μm X3.2.2 μm

Optical dimensions: 1/2 inches;

signal-to-noise ratio: 43 dB;

definition: a >1000 line;

programmable control of image size, brightness, gain, frame rate, exposure time;

frequency: <6 frames/sec @2048X1536, 10 frames/sec @1600X1200, 15 frames/sec @1280X1024, 45 frames/sec @640X 480;

sensor type: line scanning CMOS;

a lens interface: CS, C;

dynamic range: 60 dB;

sensitivity:1.0V@550nm/lux/s。

after the digital camera is used for shooting, a series of processing such as gray level conversion, binaryzation, segmentation, deletion, cutting, pasting, scaling, filling and the like are carried out on the image, the number of particles is automatically counted by measurement software through processing the image, and then the number of pixels contained in each particle is calculated to obtain the parameters such as the area, the equivalent diameter, the equivalent circumference, the actual circumference, the circularity and the like of the particle. Obtaining a particle size distribution table and a distribution diagram required by a user and typical parameters such as d10, d50, d90 and the like through particle size classification, and selecting number distribution or volume distribution according to the requirement; including raw data (sample information and test information); analysis data (particle size distribution table/particle size distribution map); graphs (frequency distribution histogram and cumulative distribution curve); typical results (median diameter, mean diameter, circularity, etc.). And detecting the edges of the obtained microscopic images of the particles in the oil, identifying various particles in the images by adopting OpenCV, training a learning vector quantization neural network by taking the extracted images as training samples, and finishing the output of edge pixels and non-edge pixels by utilizing the strong learning function and adaptive capacity of the neural network. All typical images of various pollution particles are stored in an image file, and the typical types and contents of the pollution particles in the image file can be analyzed by utilizing a computer technology.

As shown in fig. 14 and 15, the statistically relevant reference graphs of particle morphology, appearance and size distribution in oil provided in this example are shown.

Therefore, the detection and analysis system provided by the embodiment can be used for quickly and efficiently preparing the sample particles, so that less manual participation is caused in the sample pretreatment work, the process is simple, meanwhile, the particles in the sample oil can be analyzed by using the picture processing technology, the components and the microscopic morphology of the particles in the insulating oil can be quickly detected, and the staff can be helped to quickly determine the source of the particle pollutants.

Claims (10)

1. The system for detecting and analyzing the solid particles in the transformer insulating oil comprises a filter device, wherein the filter device comprises a shell and a cover body which can be turned and opened,

an upper partition plate is arranged in the shell, an installation through hole is formed in the upper partition plate, a funnel is arranged in the installation through hole, and the funnel and the partition plate are connected through an elastic mechanical supporting assembly to enable the funnel to move up and down and reset;

the funnel is characterized in that a sample bottle positioning ring is arranged at the upper part of the funnel, a top column is arranged at the center of the sample bottle positioning ring, a sample bottle is installed in the sample bottle positioning ring, the sample bottle comprises a bottle body and a bottom cover connected to the bottom of the bottle body, a liquid leakage channel is arranged on the bottom cover, an elastic mechanical switch assembly is arranged at the liquid leakage channel, and the liquid leakage channel can be opened under the action of the top column when the sample bottle moves downwards;

a mop handle is arranged below the funnel and comprises an upper boss, a middle flange and a lower boss, the upper boss is used for placing a filter membrane, the lower boss is used for connecting a vacuum bottle, a vacuum channel is arranged on the mop handle, and the vacuum channel is communicated with a vacuum source arranged in the shell;

the lid is connected with a lifting mechanism, is equipped with a pressure head on the lid, install the (mixing) shaft on the pressure head, agitator shaft connection agitator motor, the pressure head position corresponds with the vacuum bottle when the lid is closed, and when lifting mechanism drive lid downstream, the pressure head is to the sample bottle application of force, makes the sample bottle open with the funnel intercommunication, makes the funnel remove the back downwards simultaneously and goes up the terrace die cooperation with the filter membrane centre gripping fixed, and when lifting mechanism reset, sample bottle, funnel reset thereupon.

2. The system for detecting and analyzing solid particles in transformer insulating oil as claimed in claim 1, wherein a slot is formed in a bottom of the bottom cover, the elastic mechanical switch assembly includes a plug for plugging the leakage path, a driving block is connected to a middle of a bottom of the plug, first connecting rods are disposed on two sides of the driving block, a first guide rod is fixedly disposed in the slot, the first connecting rod is in sliding fit with the first guide rod, a first spring for applying a force to the first connecting rod in a downward direction is disposed on the first guide rod, and the driving block and the first connecting rod are both disposed in the slot.

3. The system for detecting and analyzing solid particles in transformer insulating oil as claimed in claim 2, wherein the elastic mechanical support assembly comprises a flange plate, a second guide rod; the flange plate is fixedly connected to the funnel main body, one end of the second guide rod is fixedly connected with the flange plate, the other end of the second guide rod is in sliding fit with the guide hole formed in the upper partition plate, and a second spring which applies force to the flange plate towards the upper side is arranged on the second guide rod.

4. The system for detecting and analyzing solid particles in transformer insulating oil as claimed in claim 2, wherein said top pillar is supported by a plurality of second connecting rods fixed to an inner wall of the funnel.

5. The system for detecting and analyzing solid particles in transformer insulating oil as claimed in claim 1, wherein the top surface of the upper boss and the bottom surface of the funnel are provided with sealing rings.

6. The system for detecting and analyzing the solid particles in the transformer insulating oil as claimed in claim 1, wherein a liquid tank and a pressure pump are further arranged in the housing, and the liquid tank is used for storing flushing liquid;

the pressure head is also provided with a plurality of spray heads which are communicated with the liquid tank through hoses;

the vacuum bottle bottom sets up the flowing back passageway, be equipped with the flowing back valve on the flowing back passageway.

7. The system for detecting and analyzing solid particles in transformer insulating oil as claimed in claim 1, wherein one end of the vacuum channel is open and disposed on the bottom surface of the lower boss, the other end of the vacuum channel is open and disposed on the middle flange, a pipeline is installed on the middle flange and connected to a vacuum source, and a tee joint and an air inlet valve are disposed on the pipeline.

8. The system for detecting and analyzing the solid particles in the transformer insulating oil as claimed in claim 1, wherein the filtering device further comprises a filter membrane frame, the filter membrane frame comprises a handheld plate and clamping arms at two sides, and supporting grooves for placing the filter membrane are arranged on the clamping arms;

one side of the shell is provided with a sliding groove for the filter membrane frame to slide, and the filter membrane is arranged on the filter membrane frame and then can be pushed to the upper boss by the sliding groove.

9. The system for detecting and analyzing solid particles in transformer insulating oil according to any one of claims 1 to 8, further comprising a micro-imager for analyzing the particles filtered on the filter membrane.

10. The method for detecting and analyzing the solid particles in the transformer insulating oil is characterized by comprising the following steps of:

s1, filtering the quantitative insulating oil through the filtering device of the detection and analysis system of any one of claims 1 to 8, separating solid particles in the insulating oil to a filter membrane, and moving the filter membrane to a watch glass;

s2, counting the number of particles, the size of the particles and the pixel content of the particles in the quantitative oil product by using a microscopic analyzer, calculating the equivalent area circle and the equivalent sphere volume of each particle to obtain the equivalent area diameter, the equivalent sphere volume diameter and the circularity parameter of the particles, carrying out classification statistics on all the particles to obtain the particle size distribution and circularity distribution information, and determining the actual components of the particle pollutants based on the analysis information.

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