Spectral gas concentration detection device for detecting fault gas concentration of transformer and detection method thereof

Abstract

The invention relates to the field of transformer detection equipment, in particular to a spectrum gas concentration detection device used for detecting the fault gas concentration of a transformer and a detection method thereof.The spectrum gas concentration detection device comprises a transformer body, an oil conservator cylinder, an end cover and a driving assembly, the oil conservator cylinder communicates with the transformer body, and the end cover is installed at one end of the oil conservator cylinder; a transmission frame and a corrugated pipe are arranged in the oil conservator cylinder, and the two ends of the corrugated pipe are connected to the opposite sides of the end cover and the transmission frame respectively. The corrugated pipe can be compressed to balance the pressure of the cavity in the oil conservator, negative pressure is formed in the oil conservator cylinder through active compression of the corrugated pipe, fault gas in transformer oil is promoted to rapidly escape and efficiently enter the sampling part, the gas collection efficiency is improved, and the detection period is shortened; the positions and the number of the sampling parts extending into the oil conservator cylinder are automatically adjusted according to the change of the oil storage cavity, so that the equipment can adapt to the change of gas sample sizes and distribution under different working conditions, and the detection accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the field of transformer detection equipment, and particularly to a spectral gas concentration detection device and a detection method for detecting the concentration of fault gases in a transformer. Background Art

[0002] As a core device in the power system, the operating state of a transformer is directly related to the stability and safety of power supply. Evaluating the working state of a transformer by detecting the concentration of fault gases has become an important means in the industry. The insulating oil inside the transformer is in a stable state during normal operation. However, when faults such as local overheating, partial discharge, and electric arc occur, the insulating oil will decompose, generating characteristic gases such as hydrogen, acetylene, ethylene, and methane. The types and concentrations of these fault gases are closely related to the types and severity of internal faults in the transformer. Spectral gas concentration detection technology has gradually become an important means for detecting transformer fault gases due to its advantages such as high sensitivity, fast response speed, and the ability to simultaneously detect multi-component gases.

[0003] During sampling, existing technologies mostly rely on natural diffusion or simple vacuum degassing methods to promote the precipitation of fault gases in transformer oil. The natural diffusion speed is slow, and it is difficult to quickly obtain a sufficient amount of gas samples; although traditional vacuum degassing devices can reduce the pressure, they cannot actively adjust the degassing space, and the gas precipitation efficiency is limited, resulting in a long detection cycle and the inability to detect early faults in a timely manner.

[0004] At the same time, the sampling probe position of traditional detection devices is fixed and cannot automatically adjust the sampling range according to the change in the oil level inside the conservator or the oil level fluctuation. Especially in a corrugated conservator, when the oil level in the conservator changes and the distribution of fault gases is uneven, it is difficult for a fixed sampling probe to collect representative gas samples, affecting the accuracy of the detection results. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems by providing a spectral gas concentration detection device and a detection method for detecting the concentration of fault gases in a transformer. By utilizing the characteristic that the bellows can be compressed to balance the pressure inside the conservator cavity, a negative pressure is actively generated inside the conservator cylinder by compressing the bellows, promoting the rapid escape of fault gases in the transformer oil and efficiently entering the sampling part. Compared with traditional single vacuum degassing or natural diffusion methods, the gas collection efficiency is improved, and the detection cycle is shortened; the position and quantity of the sampling part inserted into the conservator cylinder are automatically adjusted according to the change of the oil storage cavity, and the distance between the light source module and the photodetector is adaptively adjusted to form a spectral reaction zone with an adaptively changing length, enabling the device to adapt to the changes in the gas sample quantity and distribution under different working conditions, ensuring sufficient interaction between light and gas, and improving the detection accuracy, as described in detail below.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A spectral gas concentration detection device for detecting the concentration of fault gases in a transformer provided by the present invention includes a transformer body, an oil conservator barrel, an end cover, and a driving assembly. The oil conservator barrel is communicated with the transformer body. The end cover is installed at one end of the oil conservator barrel. A transmission frame and a bellows are arranged inside the oil conservator barrel. Two ends of the bellows are respectively connected to the opposite sides of the end cover and the transmission frame. The driving assembly is connected to the transmission frame and can drive the transmission frame to drive the bellows to move horizontally, so as to use the active compression of the bellows to create a negative pressure inside the oil conservator barrel. A part of the transmission frame extends out of the oil conservator barrel. An air chamber is arranged above the oil conservator barrel. Inside the air chamber, multiple groups of sampling parts are arranged horizontally and evenly. The sampling parts can penetrate through the top wall of the oil conservator barrel and remain communicated with the oil conservator barrel. A negative pressure generator is arranged outside the air chamber. The negative pressure generator is communicated with the air chamber to generate a negative pressure environment. A light source module that emits a specific wavelength spectrum into the air chamber is fixed on the side of the air chamber away from the end cover. The top end of the outside of the transmission frame extends into the air chamber, and a photodetector that receives the spectral signal after being absorbed by the gas in the air chamber is fixed at the top end of the transmission frame.

[0008] Preferably, an oil storage cavity is formed between the inside of the oil conservator barrel and the transmission frame. The oil storage cavity is used to store transformer oil. Multiple groups of mounting holes corresponding to the sampling parts are arranged at the top of the oil conservator barrel. A fixing hole is arranged at one end of the oil conservator barrel close to the end cover, and the fixing hole is used for the installation and fixation of the end cover on the end face of the oil conservator barrel.

[0009] Preferably, the sampling part includes a sampling cylinder and an oil-repellent breathable membrane. Side holes are provided on the sampling cylinder. The oil-repellent breathable membrane covers the outside of the side holes and only allows gas to pass through and enter the sampling cylinder. The mounting holes are used to accommodate the vertical penetration of the sampling cylinder, and a lower sealing ring that slidably seals and mates with the sampling cylinder is arranged on the top side of the mounting holes.

[0010] Preferably, a guiding hole is provided on the air chamber. A positioning frame with a rectangular frame structure is fixed at the top of the sampling cylinder. A guiding rod that vertically penetrates the guiding hole is fixed at the top of the positioning frame. The guiding hole provides guidance for the vertical sliding of the sampling part. A stop disc is fixed at the top end of the guiding rod. An upper sealing ring that slidably seals and mates with the guiding rod is arranged at the top opening of the guiding hole. An auxiliary spring that keeps the positioning frame and the sampling cylinder pressed downwards is sleeved on the outside of the guiding rod.

[0011] Preferably, the transmission frame includes a piston disc, a support arm, and a return spring. The piston disc is movably arranged in the oil conservator barrel. One end of the bellows is fixed to the movable ring on the end face of the piston disc. The support arm passes through the end cover, and the return spring is sleeved outside the support arm in the oil conservator barrel to provide the elastic force for the piston disc to drive the piston barrel to return. The top end of the support arm is bent upward, and a laterally extending connecting cylinder is fixed to the inner side of the top end of the support arm. A sliding hole is arranged on the end face of the air chamber corresponding to the connecting cylinder. A support rod penetrating into the air chamber along the sliding hole is arranged in the connecting cylinder, and the sliding hole allows the support rod to slide laterally.

[0012] Preferably, the support rod penetrates into the positioning frame to support the sampling cylinder to be taken out of the oil conservator barrel. Both ends of the two support rods are bent downward and connected with support sections. The other end of the support rod is fixed with a disassembly section detachably connected to the connecting cylinder, and the photodetector is fixed to the bottom side of the support section.

[0013] Preferably, an air pressure balance cavity is formed inside the bellows. A breathing port communicating with the air pressure balance cavity is arranged on the end cover. A rotating ear for supporting the rotation of the driving component is fixed on the outer side of the end cover, and fixing bolts for threaded cooperation with the fixing holes are arranged on the outer circumference of the end cover.

[0014] Preferably, the driving component includes a winding drum rotatably arranged in the middle of the rotating ear, and a winding motor is arranged below the winding drum. The winding motor is fixed on the outer side of the rotating ear to drive the winding drum to rotate. A locking ear is fixed in the middle section of the winding drum, and a cable is wound around the outside of the winding drum. The middle section of the cable is fixed in the locking ear, and both ends of the cable penetrate into the bellows and are connected to the piston disc.

[0015] Preferably, a covering part covering the breathing port is arranged on the outer side of the end cover. The covering part includes a cover plate fixed on the outside of the end cover. A filter screen is arranged in the middle of the cover plate, and a spiral skeleton for supporting the filter screen is fixed on the outer side of the cover plate. The negative pressure generator includes a negative pressure pump and an exhaust pipe. The negative pressure pump is used to generate negative pressure in the air chamber, and the exhaust pipe is used to discharge the exhaust gas sucked out by the negative pressure pump.

[0016] The detection method of the detection device includes the following steps:

[0017] a. Start the driving component, drive the winding drum to rotate through the winding motor, drive the piston disc of the transmission frame to move in the oil conservator barrel through the cable, compress the bellows, and then use the active compression of the bellows to initially form a negative pressure environment in the oil storage cavity in the oil conservator barrel, so as to prompt some fault gases in the transformer oil to start to escape;

[0018] b. While the piston disk moves horizontally to create a negative pressure in the oil storage chamber, since the drive frame moves horizontally synchronously with the piston disk, the support section of the drive frame moves synchronously with the piston disk. During the process of the expansion of the volume of the oil storage chamber, the support rod disengages from the positioning frames of multiple groups of sampling parts above, that is, several groups of sampling parts above the oil storage chamber are not supported by the support rod. When the volume of the oil storage chamber changes, the sampling parts at the corresponding positions above synchronously extend into the oil conservator barrel, and automatically follow the movement of the bellows position to realize the action of the sampling cylinder extending into the oil storage chamber;

[0019] c. Start the negative pressure generator, adjust the negative pressure pump to the set negative pressure value to create a negative pressure environment in the air chamber and the sampling part. This negative pressure sucks the fault gas escaping from the oil storage chamber in the oil conservator barrel into the air chamber along the sampling cylinder through the side holes and the oil-repellent and breathable membrane of the sampling cylinder;

[0020] d. Turn on the light source module to emit a specific wavelength spectrum into the air chamber. The spectrum fully interacts with the collected fault gas in the air chamber, and part of the spectrum is absorbed by the gas. The photodetector moves synchronously with the horizontal movement of the drive frame, forming a spectrum reaction area with an adaptively changing length between the photodetector and the light source module. The photodetector receives the spectrum signal after being absorbed by the gas and converts it into an electrical signal. According to the spectrum absorption principle, the concentration value of the fault gas is obtained.

[0021] The beneficial effects are as follows: 1. In the present invention, the drive assembly, the drive frame and the negative pressure generator work together. The winding motor in the drive assembly drives the reel to rotate, and drives the piston disk of the drive frame to move in the oil conservator barrel through the cable. By improving the bellows of the traditional corrugated oil conservator, using the characteristic that the bellows can be compressed to balance the pressure inside the oil conservator, a negative pressure is actively formed in the oil conservator barrel through the compression of the bellows. At the same time, the negative pressure pump of the negative pressure generator further strengthens the negative pressure environment in the air chamber and the sampling part. The dual negative pressure effect promotes the rapid escape of the fault gas in the transformer oil and efficiently enters the sampling part. Compared with the traditional single vacuum degassing or natural diffusion method, the gas collection efficiency is improved and the detection cycle is shortened;

[0022] 2. The sampling part adopts a structure of a sampling cylinder with an outer oil-repellent and breathable membrane. The oil-repellent and breathable membrane covers the side holes of the sampling cylinder, allowing only gas to pass through, effectively blocking the entry of transformer oil, ensuring the purity of the collected gas, and avoiding the interference of oil on the detection results;

[0023] 3. While the transmission frame moves horizontally following the piston disc, it not only realizes the function of negative pressure generation, but also drives the photodetector to move synchronously. Cooperating with the support section that bends downward at the end of the support rod, the support section is used to position and support the transmission frames of multiple sampling parts. It can automatically adjust the position and quantity of the sampling parts inserted into the oil conservator cylinder according to the change of the oil storage cavity, and adaptively adjust the distance between the light source module and the photodetector, forming a spectral response area with an adaptively changing length, enabling the device to adapt to the changes in the gas sample quantity and distribution under different working conditions, ensuring sufficient interaction between light and gas, and improving the detection accuracy.

[0024] 4. And multiple sampling parts with their tops extending out of the gas chamber are provided. The position of the top of the sampling part is used as an indication mark for the position of the transformer oil in the oil storage cavity, so that it is easier for transformer maintenance personnel to directly view the surplus and deficit of the transformer oil in the oil conservator cylinder. Compared with the traditional transparent observation window, since the observation window is easily covered by dirt, by having the sampling part also function as an oil level indication mechanism, it is more suitable for outdoor transformers. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is the front view structure diagram of the present invention;

[0027] Figure 2 is the right view structure diagram of the present invention;

[0028] Figure 3 is the three-dimensional structure schematic diagram of the present invention;

[0029] Figure 4 is the structure splitting schematic diagram of the present invention;

[0030] Figure 5 is the three-dimensional structure schematic diagram of the oil conservator cylinder of the present invention;

[0031] Figure 6 is the three-dimensional structure schematic diagram of the transmission frame of the present invention;

[0032] Figure 7 is the three-dimensional structure schematic diagram of the end cover of the present invention;

[0033] Figure 8 is the structure splitting schematic diagram of the drive assembly of the present invention;

[0034] Figure 9 is the three-dimensional structure schematic diagram of the gas chamber of the present invention;

[0035] Figure 10 It is a schematic three-dimensional structure diagram of another direction of the air chamber of the present invention;

[0036] Figure 11 It is a schematic three-dimensional structure diagram of the sampling part of the present invention;

[0037] Figure 12 It is a schematic diagram of the structural disassembly of the sampling part of the present invention;

[0038] Figure 13 It is a top view structure diagram of the present invention;

[0039] Figure 14 It is the present invention Figure 13 The structural cross-sectional view at A-A in;

[0040] Figure 15 It is a schematic three-dimensional structure diagram of another direction of the present invention.

[0041] The description of the reference numerals in the drawings is as follows:

[0042] 1. Transformer body; 2. Conservator barrel; 201. Mounting hole; 201a. Lower sealing ring; 202. Fixing hole; 203. Oil storage cavity; 3. End cover; 301. Rotating ear; 302. Fixing bolt; 303. Breather port; 304. Fixing ring; 4. Driving assembly; 401. Reel; 401a. Locking ear; 402. Rewinding motor; 403. Cable; 5. Transmission frame; 501. Piston disc; 501a. Movable ring; 502. Support arm; 503. Return spring; 504. Connecting cylinder; 505. Support rod; 505a. Support section; 505b. Disassembly and assembly section; 6. Air chamber; 601. Guide hole; 601a. Upper sealing ring; 602. Slide hole; 7. Sampling part; 701. Sampling cylinder; 701a. Side hole; 702. Positioning frame; 703. Guide rod; 704. Auxiliary spring; 705. Oil-repellent and breathable membrane; 706. Baffle plate; 8. Negative pressure generator; 801. Negative pressure pump; 802. Exhaust pipe; 9. Bellows; 901. Air pressure balance cavity; 10. Covering part; 10a. Cover plate; 10b. Filter screen; 10c. Spiral skeleton; 11. Light source module; 12. Photoelectric detector; 13. Oil supply pipe; 14. High-voltage outlet terminal; 15. Low-voltage outlet terminal; 16. Conservator support; 17. Heat dissipation fin; 18. Circulation pipe; 19. Water pump. Detailed implementation manners

[0043] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope protected by the present invention.

[0044] See also Figures 1 - 15 As shown, the present invention provides a spectral gas concentration detection device for detecting the concentration of transformer fault gas, comprising a transformer body 1, an oil pillow tube 2, an end cover 3 and a driving assembly 4, the oil pillow tube 2 and the transformer body 1 are connected through an oil supply pipe 13, ensuring that when the transformer oil inside the transformer body 1 changes in volume due to temperature changes, the oil pillow tube 2 can provide a container for the transformer oil volume change, the end cover 3 is installed at one end of the oil pillow tube 2, and a transmission frame 5 and a bellows 9 are arranged inside the oil pillow tube 2, and the bellows 9 is the core component of the corrugated oil pillow. The adaptive change of the transformer oil storage space in the oil pillow tube 2 is achieved by contraction of the bellows 9. The two ends of the bellows 9 are respectively connected to the end cover 3 and the opposite side of the transmission frame 5. The driving assembly 4 is connected to the transmission frame 5 and can drive the transmission frame 5 to drive the bellows 9 to move horizontally to achieve compression or expansion, so as to use the bellows 9 to actively compress to form a negative pressure in the oil pillow tube 2. Part of the transmission frame 5 extends out of the oil pillow tube 2. An air chamber 6 is arranged above the oil pillow tube 2. A plurality of sampling parts 7 as transformer oil fault gas collection equipment are evenly arranged in the horizontal direction inside the air chamber 6, and the sampling part 7 can penetrate The top wall of the oil pillow tube 2 is penetrated and maintained in communication with the oil pillow tube 2, so that the fault gas in the transformer oil in the oil pillow tube 2 can be introduced into the air chamber 6 by using the sampling part 7. The air chamber 6 serves as a spectral detection and analysis cavity for the fault gas, and plays the role of a container for containing the fault gas and analyzing it. A negative pressure generator 8 is arranged outside the air chamber 6, and the negative pressure generator 8 is connected to the air chamber 6 to generate a negative pressure environment for the air chamber 6, thereby assisting the sampling part 7 to guide the fault gas in the oil pillow tube 2 into the air chamber 6, so as to facilitate the timely collection of the fault gas and improve the fault detection speed. A light source module 11 emitting a specific wavelength spectrum into the air chamber 6 is fixed on the side away from the end cover 3, the outer top of the transmission frame 5 extends into the air chamber 6, and a photoelectric detector 12 is fixed on the top of the transmission frame 5 for receiving the spectrum signal after absorption by the gas in the air chamber 6. The photoelectric detector 12 has an ECU that stores set spectrum information. The spectrum information after the light emitted by the light source module 11 reacts with the fault gas is detected by the photoelectric detector 12, and compared with the stored set spectrum information data, so as to obtain the type of the fault gas, and then reflect the fault information of the transformer.

[0045] As an optional embodiment, an oil storage chamber 203 is formed between the inside of the oil pillow cylinder 2 and the transmission frame 5, and the oil storage chamber 203 is used to store the transformer oil input into the oil pillow cylinder 2 along the oil supply pipe 13. The top of the oil pillow cylinder 2 is provided with a plurality of groups of mounting holes 201 corresponding to the sampling part 7 to accommodate the vertical movement of the bottom end of the sampling part 7. The oil pillow cylinder 2 is provided with a fixing hole 202 at one end close to the end cover 3, and the fixing hole 202 is used for the installation and fixing of the oil pillow cylinder 2 and its end face end cover 3;

[0046] Specifically, the sampling unit 7 includes a sampling cylinder 701 and an oil-repellent breathable membrane 705. The sampling cylinder 701 is provided with side holes 701a. The oil-repellent breathable membrane 705 is a cylindrical structure with a closed bottom end. The oil-repellent breathable membrane 705 is sleeved outside the bottom end of the sampling cylinder 701, and the oil-repellent breathable membrane 705 covers the outside of the side holes 701a. The oil-repellent breathable membrane 705 is made of polytetrafluoroethylene and only allows gas to pass through and enter the sampling cylinder 701. The mounting hole 201 is used to accommodate the vertical penetration of the sampling cylinder 701, and a lower sealing ring 201a that is slidably and sealingly fitted with the sampling cylinder 701 is arranged on the top side of the mounting hole 201 to ensure the sealing effect at the position where the sampling cylinder 701 penetrates the top wall of the oil conservator cylinder 2;

[0047] The air chamber 6 is provided with a guiding hole 601. A positioning frame 702 with a rectangular frame structure and vertically placed is fixed on the top of the sampling cylinder 701. A guiding rod 703 that vertically penetrates the guiding hole 601 is fixed on the top of the positioning frame 702. The guiding hole 601 provides guidance for the vertical sliding of the sampling unit 7. A stop disk 706 is fixed at the top end of the guiding rod 703 to prevent the whole guiding rod 703 from disengaging downward from the guiding hole 601. An upper sealing ring 601a that is slidably and sealingly fitted with the guiding rod 703 is arranged at the top opening of the guiding hole 601 to ensure the sealing effect of the gap between the guiding rod 703 and the guiding hole 601. An auxiliary spring 704 that keeps the positioning frame 702 and the sampling cylinder 701 pressed downward is sleeved outside the guiding rod 703;

[0048] The transmission frame 5 includes a piston disk 501, a support arm 502, and a return spring 503. The piston disk 501 is movably arranged in the oil conservator cylinder 2. One end of the bellows 9 is fixed on the movable ring 501a on the end face of the piston disk 501. The support arm 502 passes through the end cover 3, and the return spring 503 is sleeved outside the support arm 502 in the oil conservator cylinder 2 and is used to provide the elastic force for driving the piston cylinder to reset by the piston disk 501. The top end of the support arm 502 is bent upward, and a laterally extending connecting cylinder 504 is fixed inside the top end of the support arm 502. A sliding hole 602 corresponding to the connecting cylinder 504 is arranged on the end face of the air chamber 6. A support rod 505 that penetrates into the air chamber 6 along the sliding hole 602 is arranged inside the connecting cylinder 504. The number of the support rods 505 is two. The sliding hole 602 allows the support rods 505 to slide laterally to ensure that the whole transmission frame 5 can synchronously slide laterally following the piston disk 501;

[0049] The support rod 505 is inserted into the positioning frame 702 to support the sampling cylinder 701 to move upward out of the inner cavity of the oil conservator cylinder 2. Both ends of the two support rods 505 are bent downward and connected with a support section 505a. The other end of the support rod 505 is fixed with a disassembly and assembly section 505b that is detachably connected to the connecting cylinder 504. The photodetector 12 is fixed to the bottom side of the support section 505a to ensure that the photodetector 12 can move horizontally synchronously with the transmission frame 5. During the process of pulling the piston disc 501 to form a negative pressure in the oil storage cavity 203, the transmission frame 5 can drive the photodetector 12 to move horizontally synchronously to change the distance between the photodetector 12 and the light source module 11, adapt the distance of the light reaction area to the working distances of several groups of sampling parts 7, and improve the recognition accuracy of the spectral reaction;

[0050] An air pressure balance cavity 901 is formed inside the bellows 9. A breathing port 303 communicating with the air pressure balance cavity 901 is provided on the end cover 3. The breathing port 303 is used to ensure that the air in the air pressure balance cavity 901 can communicate with the external environment during the compression and stretching processes of the bellows 9 to ensure the smooth movement of the bellows 9. A rotating ear 301 for supporting the rotation of the driving component 4 is fixed on the outer side of the end cover 3. And fixing bolts 302 for threaded cooperation with the fixing holes 202 are provided on the outer circumference of the end cover 3. A sealing ring (not shown in the figure) is provided at the joint of the end cover 3 and the oil conservator cylinder 2 to ensure that the end cover 3 can be tightly fixed to the end face of the oil conservator cylinder 2, thereby ensuring the sealing effect of the space outside the bellows 9 in the oil conservator cylinder 2;

[0051] The driving assembly 4 includes a winding drum 401 rotatably arranged in the middle of the rotating ear 301, and a winding motor 402 is arranged below the winding drum 401. The winding motor 402 is fixed to the outside of the rotating ear 301 for driving the winding drum 401 to rotate. A locking ear 401a is fixed in the middle section of the winding drum 401, and a cable 403 is wound around the outside of the winding drum 401. The middle section of the cable 403 is fixed in the locking ear 401a, and both ends of the cable 403 are wound around the outside of the winding drum 401 and penetrate into the corrugated pipe 9. Both ends of the cable 403 are connected to the end face of the piston disc 501. So as to drive the winding drum 401 to rotate through the winding motor 402 of the driving assembly 4, thereby using the winding drum 401 to pull both ends of the cable 403 to be wound and unfolded synchronously, realizing the transverse movement of the piston disc 501, and using the piston disc 501 to support the corrugated pipe 9 to be compressed and stretched, thereby controlling the volume change of the oil storage chamber 203. When it is necessary to detect the fault gas, it is convenient to pull the piston disc 501 to drive the corrugated pipe 9 to be compressed to expand the volume of the oil storage chamber 203, reduce the pressure of the transformer oil, form a negative pressure in the oil storage chamber 203, promote the rapid precipitation of the fault gas in the transformer oil, realize active sampling, and improve the low efficiency problem that the existing equipment needs to wait for the fault gas to escape independently for sampling. At the same time, the corrugated pipe 9 still serves as a component for the volume compression change of the traditional corrugated pipe oil conservator. When the volume of the oil in the transformer changes due to temperature changes, the corrugated pipe 9 expands and contracts passively through the volume change of the transformer oil in the oil storage chamber 203 to maintain the oil pressure stability in the transformer body 1 and the oil conservator barrel 2;

[0052] A covering part 10 covering the breathing port 303 is arranged on the outside of the end cover 3. The covering part 10 includes a cover plate 10a fixed to the outside of the end cover 3. A filter screen 10b is arranged in the middle of the cover plate 10a, and a spiral skeleton 10c supporting the filter screen 10b is fixed to the outside of the cover plate 10a. The cover plate 10a, the filter screen 10b and the spiral skeleton 10c are all made of metal materials to ensure the structural strength and durability of the covering part 10. The negative pressure generator 8 includes a negative pressure pump 801 and an exhaust pipe 802. The negative pressure pump 801 is used to generate negative pressure in the air chamber 6, and the exhaust pipe 802 is used to discharge the exhaust gas sucked out by the negative pressure pump 801. An oil conservator bracket 16 for supporting the oil conservator barrel 2 is arranged on the top of the transformer body 1. The oil conservator barrel 2 and its external accessories are fixed to one side above the transformer body 1 through the oil conservator bracket 16 to ensure that the height of the oil conservator barrel 2 is higher than that of the transformer body 1, so as to ensure that when the volume of the transformer oil changes due to different temperatures, the internal oil pressure can be kept stable through the oil conservator barrel 2. Specifically, when the transformer body 1 is running, the oil temperature expands and contracts with the change of the load. The oil conservator barrel 2 can accommodate the expansion or contraction of the volume of the transformer oil, avoid damage to the transformer body 1 due to pressure changes, and prevent the oil surface from contacting the air frequently, reducing the oxidation and moisture absorption of the oil.

[0053] In addition, high-voltage outgoing terminals 14 and low-voltage outgoing terminals 15 are arranged on the top of the transformer body 1 on both sides. The high-voltage outgoing terminal 14 is connected to the high-voltage winding of the transformer to transmit the high-voltage electric energy after being stepped up or down by the transformer to the transmission line of the external high-voltage power grid. The low-voltage outgoing terminal 15 is connected to the low-voltage winding of the transformer to convert the high-voltage electric energy into low-voltage electric energy after being stepped down by the transformer and access the low-voltage power distribution system to distribute the electric energy to specific loads. A circulation pipe 18 for containing transformer oil is arranged outside the transformer body 1. Heat dissipation fins 17 are arranged outside the circulation pipe 18. A water pump 19 is arranged at the connection between the circulation pipe 18 and the transformer body 1. The water pump 19 is used to circulate the transformer oil in the circulation pipe 18 to form a heat dissipation loop connecting the transformer body 1, so as to utilize the heat dissipation fins 17 to dissipate the working heat of the transformer oil in the circulation pipe 18 to the outside for cooling.

[0054] The present invention also provides a detection method for a spectral gas concentration detection device for detecting the concentration of transformer fault gases, including the following steps:

[0055] a. Start the driving assembly 4, drive the reel 401 to rotate through the winding motor 402, and drive the piston disk 501 of the transmission frame 5 to move in the oil conservator cylinder 2 through the cable 403, so as to compress the corrugated pipe 9. Then, by actively compressing the corrugated pipe 9, a negative pressure environment is initially formed in the oil storage cavity 203 in the oil conservator cylinder 2, prompting some fault gases in the transformer oil to start escaping;

[0056] b. While the piston disk 501 moves horizontally to form a negative pressure in the oil storage cavity 203, since the transmission frame 5 moves horizontally synchronously with the piston disk 501, the support section 505a of the transmission frame 5 moves synchronously with the piston disk 501. During the process of the volume of the oil storage cavity 203 expanding, the support rod 505 is separated from the positioning frames 702 of multiple groups of sampling parts 7 above, that is, several groups of sampling parts 7 above the oil storage cavity 203 are not supported by the support rod 505. When the volume of the oil storage cavity 203 changes, the sampling parts 7 at the corresponding positions above synchronously extend into the oil conservator cylinder 2, and automatically follow the position movement of the corrugated pipe 9 to realize the action of the sampling cylinder 701 extending into the oil storage cavity 203;

[0057] c. Start the negative pressure generator 8, adjust the negative pressure pump 801 to the set negative pressure value, form a negative pressure environment in the gas chamber 6 and the sampling part 7. This negative pressure sucks the fault gases escaping from the oil storage cavity 203 in the oil conservator cylinder 2 into the gas chamber 6 along the sampling cylinder 701 through the side holes 701a and the oil-repellent breathable film 705 of the sampling cylinder 701;

[0058] d. Turn on the light source module 11 and emit a specific wavelength spectrum into the gas chamber 6. The spectrum fully interacts with the detected fault gas in the gas chamber 6, and part of the spectrum is absorbed by the gas. The photodetector 12 moves synchronously with the horizontal movement of the drive frame 5, forming a spectral reaction area with an adaptively changing length between the photodetector 12 and the light source module 11. The photodetector 12 receives the spectral signal after gas absorption and converts it into an electrical signal. According to the spectral absorption principle, the concentration value of the fault gas is obtained.

[0059] In the present invention, by setting the drive assembly 4, the drive frame 5 and the negative pressure generator 8 to work together, the winding motor 402 in the drive assembly 4 drives the reel 401 to rotate, and drives the piston disk 501 of the drive frame 5 to move in the oil conservator barrel 2 through the cable 403. The corrugated pipe 9 of the traditional corrugated oil conservator is improved. Through the characteristic that the corrugated pipe 9 can be compressed to balance the pressure in the internal cavity of the oil conservator, a negative pressure is actively formed in the oil conservator barrel 2 by the compression of the corrugated pipe 9. At the same time, the negative pressure pump 801 of the negative pressure generator 8 further strengthens the negative pressure environment in the gas chamber 6 and the sampling part 7. The dual negative pressure effect promotes the rapid escape of the fault gas in the transformer oil and efficiently enters the sampling part 7. Compared with the traditional single vacuum degassing or natural diffusion method, the gas collection efficiency is improved and the detection cycle is shortened.

[0060] The sampling part 7 adopts a structure of a sampling cylinder 701 with an outer hydrophobic and breathable membrane 705. The hydrophobic and breathable membrane 705 covers the side hole 701a of the sampling cylinder 701, allowing only gas to pass through, effectively blocking the entry of transformer oil, ensuring the purity of the collected gas, and avoiding the interference of oil on the detection results.

[0061] While the drive frame 5 moves horizontally following the piston disk 501, it not only realizes the negative pressure generation function, but also drives the photodetector 12 to move synchronously. Cooperating with the support section 505a with the end of the support rod 505 bent downward, the support section 505a is used to position and support the drive frame 5 of multiple sampling parts 7. The position and quantity of the sampling part 7 extending into the oil conservator barrel 2 can be automatically adjusted according to the change of the oil storage cavity 203, and the distance between the light source module 11 and the photodetector 12 can be adaptively adjusted to form a spectral reaction area with an adaptively changing length, enabling the device to adapt to the changes in the gas sample volume and distribution under different working conditions, ensuring full interaction between light and gas, and improving the detection accuracy.

[0062] And multiple sampling parts 7 with their tops extending out of the gas chamber 6 are provided. The top position of the sampling part 7 is used as an indication mark for the position of the transformer oil in the oil storage cavity 203, so that it is easier for transformer maintenance personnel to directly view the surplus and deficit of the transformer oil in the oil conservator barrel 2. Compared with the traditional transparent observation window, since the observation window is easily covered by dirt, the sampling part 7 has the function of an oil level indication mechanism, making it more suitable for outdoor transformers.

[0063] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims described above.

Claims

1. A spectral gas concentration detection device for detecting transformer fault gas concentration, characterized in that: The invention comprises a transformer body (1), an oil pillow cylinder (2), an end cover (3) and a driving assembly (4), wherein the oil pillow cylinder (2) is connected to the transformer body (1), the end cover (3) is mounted on one end of the oil pillow cylinder (2), a transmission frame (5) and a bellows (9) are arranged inside the oil pillow cylinder (2), two ends of the bellows (9) are respectively connected to the end cover (3) and the opposite sides of the transmission frame (5), the driving assembly (4) is connected to the transmission frame (5) and can drive the transmission frame (5) to drive the bellows (9) to move laterally, so as to form a negative pressure in the oil pillow cylinder (2) by actively compressing the bellows (9), the transmission frame (5) partially extends out of the oil pillow cylinder (2), and the oil pillow cylinder (2) An air chamber (6) is arranged at the top, and a plurality of sampling parts (7) are arranged uniformly in the transverse direction inside the air chamber (6), and the sampling parts (7) can penetrate the top wall of the oil pillow tube (2) and maintain communication with the oil pillow tube (2). A negative pressure generator (8) is arranged outside the air chamber (6), and the negative pressure generator (8) is communicated with the air chamber (6) to generate a negative pressure environment. A light source module (11) is fixed to the side of the air chamber (6) away from the end cover (3) to emit a specific wavelength spectrum into the air chamber (6), and the top end of the transmission frame (5) extends into the air chamber (6), and a photoelectric detector (12) is fixed to the top end of the transmission frame (5) to receive a spectral signal after absorption by the gas in the air chamber (6).

2. A spectral gas concentration detection device for detecting transformer fault gas concentration according to claim 1, characterized in that: An oil storage chamber (203) is formed between the interior of the oil pillow tube (2) and the transmission frame (5), and the oil storage chamber (203) is used to store transformer oil. A plurality of groups of mounting holes (201) are provided at the top end of the oil pillow tube (2) corresponding to the sampling portion (7). A fixing hole (202) is provided at one end of the oil pillow tube (2) close to the end cover (3), and the fixing hole (202) is used to install and fix the end cover (3) on the end surface of the oil pillow tube (2).

3. A spectral gas concentration detection device for detecting transformer fault gas concentration according to claim 2, characterized in that: The sampling portion (7) comprises a sampling tube (701) and an oleophobic breathable membrane (705); a side hole (701a) is provided on the sampling tube (701); the oleophobic breathable membrane (705) covers the outside of the side hole (701a) and only allows gas to pass through to enter the sampling tube (701); the mounting hole (201) is used to accommodate the sampling tube (701) to penetrate vertically, and a lower sealing ring (201a) for sliding sealing and matching the sampling tube (701) is provided on the top side of the mounting hole (201).

4. A spectral gas concentration detection device for detecting transformer fault gas concentration according to claim 3, characterized in that: The air chamber (6) is provided with a guide hole (601), a positioning frame (702) of a rectangular frame structure is fixed on the top of the sampling tube (701), a guide rod (703) vertically penetrating the guide hole (601) is fixed on the top of the positioning frame (702), the guide hole (601) provides guidance for the vertical sliding of the sampling part (7), a baffle (706) is fixed on the top of the guide rod (703), an upper sealing ring (601a) for sliding sealing and cooperating with the guide rod (703) is provided at the top of the guide hole (601), and an auxiliary spring (704) for keeping the positioning frame (702) and the sampling tube (701) pressed downward is sleeved on the outer side of the guide rod (703).

5. A spectral gas concentration detection device for detecting transformer fault gas concentration according to claim 4, characterized in that: The transmission frame (5) comprises a piston disc (501), a support arm (502) and a return spring (503); the piston disc (501) is movably arranged in the oil pillow cylinder (2); one end of the bellows (9) is fixed to a movable ring (501a) on the end surface of the piston disc (501); the support arm (502) passes through the end cover (3); and the return spring (503) is sleeved on the outside of the support arm (502) in the oil pillow cylinder (2) to provide The piston disc (501) drives the elastic force of the piston cylinder to return to its original position. The top end of the support arm (502) is bent upward, and a connecting tube (504) extending laterally is fixed on the inner side of the top end of the support arm (502). A sliding hole (602) is provided on the end surface of the air chamber (6) corresponding to the connecting tube (504). A supporting rod (505) is provided in the connecting tube (504) and penetrates into the air chamber (6) along the sliding hole (602). The sliding hole (602) allows the supporting rod (505) to slide laterally.

6. A spectral gas concentration detection device for detecting transformer fault gas concentration according to claim 5, characterized in that: The support rod (505) is inserted into the positioning frame (702) to support the sampling tube (701) to be removed from the oil pillow tube (2). The ends of the two support rods (505) are bent downward and connected to a support section (505a). The other end of the support rod (505) is fixed with a disassembly section (505b) that is detachably connected to the connecting tube (504). The photoelectric detector (12) is fixed to the bottom side of the support section (505a).

7. A spectral gas concentration detection device for detecting transformer fault gas concentration according to claim 6, characterized in that: An air pressure balance chamber (901) is formed inside the bellows (9), a breathing port (303) communicating with the air pressure balance chamber (901) is provided on the end cover (3), a rotating ear (301) supporting the rotation of the drive assembly (4) is fixed on the outside of the end cover (3), and a fixing bolt (302) threadedly matched with the fixing hole (202) is provided on the outer circumference of the end cover (3).

8. A spectral gas concentration detection device for detecting transformer fault gas concentration according to claim 7, characterized in that: The driving assembly (4) comprises a reel (401) rotatably arranged in the middle of the rotating ear (301), and a winding motor (402) is arranged below the reel (401), and the winding motor (402) is fixed to the outside of the rotating ear (301) to drive the reel (401) to rotate, and a locking ear (401a) is fixed to the middle section of the reel (401), and a cable (403) is wound around the outside of the reel (401), and the middle section of the cable (403) is fixed in the locking ear (401a), and both ends of the cable (403) are inserted into the bellows (9) and connected to the piston disc (501).

9. A spectral gas concentration detection device for detecting transformer fault gas concentration according to claim 7, characterized in that: A covering portion (10) covering the breathing port (303) is arranged on the outside of the end cover (3), the covering portion (10) comprises a cover plate (10a) fixed to the outside of the end cover (3), a filter screen (10b) is arranged in the middle of the cover plate (10a), and a vortex frame (10c) supporting the filter screen (10b) is fixed on the outside of the cover plate (10a), the negative pressure generator (8) comprises a negative pressure pump (801) and an exhaust pipe (802), the negative pressure pump (801) is used to generate negative pressure in the air chamber (6), and the exhaust pipe (802) is used to discharge the exhaust gas sucked out by the negative pressure pump (801).

10. The detection method of the detection device according to claim 9, characterized in that: The following steps are involved: a. Start the driving assembly (4), drive the reel (401) to rotate via the reeling motor (402), and drive the piston plate (501) of the transmission frame (5) to move in the oil pillow cylinder (2) via the cable (403), so as to compress the bellows (9), and then utilize the bellows (9) to actively compress, thereby initially forming a negative pressure environment in the oil storage chamber (203) in the oil pillow cylinder (2), so as to promote the escape of part of the fault gas in the transformer oil; b. When the piston disc (501) moves laterally to form a negative pressure in the oil storage chamber (203), the transmission frame (5) and the piston disc (501) move laterally synchronously, and the support section (505a) of the transmission frame (5) moves synchronously with the piston disc (501). During the process of the volume expansion of the oil storage chamber (203), the support rod (505) and the positioning frame (702) of the multiple groups of sampling parts (7) above are separated, that is, the multiple groups of sampling parts (7) above the oil storage chamber (203) are not supported by the support rod (505). When the volume of the oil storage chamber (203) changes, the sampling parts (7) at the corresponding positions above synchronously move down into the oil pillow tube (2) and automatically follow the position movement of the bellows (9) to realize the extension of the sampling tube (701) into the oil storage chamber (203); c. Start the negative pressure generator (8), adjust the negative pressure pump (801) to a set negative pressure value, and form a negative pressure environment in the air chamber (6) and the sampling portion (7). The negative pressure passes through the side hole (701a) of the sampling tube (701) and the oleophobic breathable membrane (705), and sucks the fault gas escaping from the oil storage cavity (203) in the oil pillow tube (2) into the air chamber (6) along the sampling tube (701); d. Turn on the light source module (11) to emit a spectrum of a specific wavelength into the air chamber (6). The spectrum fully interacts with the collected fault gas in the air chamber (6), and part of the spectrum is absorbed by the gas. The photoelectric detector (12) moves synchronously with the lateral movement of the transmission frame (5), and a spectrum reaction zone with adaptive length change is formed between the photoelectric detector (12) and the light source module (11). The photoelectric detector (12) receives the spectrum signal after gas absorption and converts it into an electrical signal. According to the spectrum absorption principle, the concentration value of the fault gas is obtained.

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