A power transformer monitoring device and monitoring method for power distribution networks

Abstract

This invention discloses a power transformer monitoring device and method for power distribution networks. The device includes an oil-immersed transformer, on which an electrical variable detector for detecting internal oil temperature is installed. The device measures current / voltage waveforms in real time, enabling real-time monitoring of the electrical variables of the oil-immersed transformer. The method includes the following steps: S1, measuring current / voltage waveforms in real time using an electronic instrument transformer, enabling real-time monitoring of the electrical variables of the oil-immersed transformer. This invention uses an electronic instrument transformer to measure current / voltage waveforms in real time, enabling real-time monitoring of the electrical variables of the oil-immersed transformer. The oil temperature detection by a temperature sensor can also indirectly reflect changes in the transformer. Combined with the electronic instrument transformer, changes in the transformer are detected more accurately. The electrical variable detector, in conjunction with a temperature control mechanism, can provide stable and effective heat dissipation for the oil-immersed transformer.

Description

Technical Field

[0001] This invention relates to the field of transformer monitoring technology, and in particular to a power transformer monitoring device and method for power distribution networks. Background Technology

[0002] Oil-immersed transformers are a new type of high-performance transformer with a more rational structure and superior performance. Oil-immersed transformers typically have an oil conservator installed, which supplies oil to the transformer. When the internal temperature of the oil-immersed transformer rises and expands, the oil flows through pipes into the conservator, effectively relieving pressure inside the transformer. While oil-immersed transformers effectively dissipate heat, the cooling oil still needs cooling. Therefore, cooling fins are installed on the outside of the transformer, with fans mounted on them. Temperature monitoring devices are installed on the transformer; when the oil temperature is detected to be high, the fans are activated. The fans dissipate heat from the cooling fins, thus cooling the oil. However, the cooling fins, being externally located, accumulate dust over time, reducing their cooling efficiency and hindering effective control of the cooling oil temperature. Even with controlled fan speeds, the dust-covered cooling fins still have poor thermal conductivity.

[0003] The existing self-cooling transformer with publication number CN119381118A uses air accelerated by a cooling fan to flow over the surface of the coil and heat sink, which can dissipate heat from the coil and heat sink. However, it cannot effectively remove dust. As a result, the dust adheres to the coil, which will affect the heat exchange of the coil, especially when used outdoors in environments with a lot of lint and dust.

[0004] Therefore, this application proposes a power transformer monitoring device and monitoring method for power distribution networks. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned technical problems by proposing a power transformer monitoring device and monitoring method for power distribution networks.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A power transformer monitoring device for a power distribution network includes an oil-immersed transformer. A bracket is installed on one side of the oil-immersed transformer, and an oil conservator is installed on the bracket. The oil conservator is connected to the oil-immersed transformer via a delivery pipe. The device is characterized by having an electrical variable detector installed on the oil-immersed transformer for detecting internal oil temperature and real-time monitoring of the transformer's current / voltage waveform. A temperature control mechanism, controlled by the electrical variable detector, is installed on the bracket to circulate and cool the internal cooling oil of the oil-immersed transformer. The temperature control mechanism includes a mounting box installed at the bottom of the bracket and a serpentine temperature control tube rotatably installed inside the mounting box and connected to the oil conservator. The cooling oil can circulate between the oil conservator and the serpentine temperature control tube. An elastic dust filter is installed at the bottom of the mounting box, and a cleaning mechanism is installed inside the mounting box and connected to the elastic dust filter. A fan is installed on the mounting box. When the fan operates, air enters the mounting box through the elastic dust filter and blows onto the rotatable serpentine temperature control tube. The cleaning mechanism, in conjunction with the serpentine temperature control tube, allows the elastic dust filter to be stretched and rolled up, reducing the contact area with the filtered material.

[0008] Preferably, the pump body is equipped with an inlet pipe at the inlet end, the inlet pipe is connected to the oil-immersed transformer, and the inlet pipe is located near the bottom of the oil-immersed transformer; the pump body is equipped with an outlet pipe at the outlet end.

[0009] Preferably, the device further includes a drive mechanism connected to the liquid outlet pipe and capable of driving the serpentine temperature control tube to rotate. The drive mechanism includes a piston cylinder installed in the mounting box and connected to the liquid outlet pipe. A movable piston is slidably connected inside the piston cylinder. A first spring is fixedly connected to the movable piston and the piston cylinder. A drive rod is fixedly connected to the movable piston. A rack plate is fixedly connected to the drive rod. A first rotating tube and a second rotating tube, which are coaxially arranged, are fixedly connected to both ends of the serpentine temperature control tube. Both the first rotating tube and the second rotating tube pass through the mounting box and are rotatably connected to it. A gear is installed on the second rotating tube, and the gear meshes with the rack plate.

[0010] Preferably, a first rotary joint is installed at the end of the first rotary tube, and a return pipe is fixedly connected to the first rotary joint. The return pipe is connected to the oil conservator. A second rotary joint is installed on the second rotary tube, and a first oil supply pipe and a second oil supply pipe are connected to the second rotary joint. Both the first oil supply pipe and the second oil supply pipe are connected to the piston cylinder. A solenoid valve is installed on the first oil supply pipe, and the second oil supply pipe is arranged opposite to the moving piston.

[0011] Preferably, it also includes a cleaning mechanism for cleaning the elastic dust filter. The cleaning mechanism includes a shaft rotatably installed in the mounting box, a vertical rod slidably connected to and capable of resetting on the shaft, a connecting block fixed at the bottom of the vertical rod, the connecting block being fixedly connected to the elastic dust filter, a U-shaped block fixed at the upper end of the vertical rod, a short shaft rotatably connected to and capable of resetting inside the U-shaped block, a limiting rod fixedly connected to the short shaft, and the limiting rod cooperating with the serpentine temperature control tube.

[0012] Preferably, a second spring is fixed to the bottom of the U-shaped block, the lower end of the second spring is fixed to the shaft, and the second spring is sleeved on the outside of the vertical rod.

[0013] Preferably, torsion springs are installed between both ends of the short shaft and the U-shaped block, and the limiting rod is horizontally positioned when the torsion springs are stable.

[0014] Preferably, a through hole is provided through the shaft, and a helical rod is inserted through the through hole for mating connection. A connecting block is fixed to the bottom of the helical rod, and the connecting block is fixedly connected to the elastic dust filter. A U-shaped block is rotatably connected to the upper end of the helical rod, and a short shaft is rotatably connected inside the U-shaped block. Torsion springs are installed between both ends of the short shaft and the U-shaped block. A limiting rod is sleeved on the short shaft and fixedly connected thereto. The limiting rod is configured to cooperate with the serpentine temperature control tube. A second spring is fixed to the bottom of the U-shaped block, and the lower end of the second spring is fixed to the shaft, and the second spring is sleeved on the outside of the helical rod.

[0015] This invention also discloses a method for monitoring power transformers in a power distribution network, comprising the following steps:

[0016] S1, through the electronic instrument transformer, measures the current / voltage waveform in real time, enabling real-time understanding of the electrical variables of the oil-immersed transformer;

[0017] S2, through the electrical variable detector, can detect the temperature of the cooling oil inside the oil-immersed transformer and transmit the signal to the controller, which controls the operation of the pump and the fan.

[0018] S3, after working for a period of time, the solenoid valve is intermittently opened and closed by the controller;

[0019] S4. If the oil temperature detected by the electro-variable detector has not reached the set temperature for a long time, the fan and pump will not work.

[0020] Compared with the prior art, the beneficial effects of this invention are as follows:

[0021] 1. By measuring the current / voltage waveform in real time using electronic instrument transformers, the electrical variables of oil-immersed transformers can be understood in real time; the changes in transformers can also be indirectly fed back by detecting the oil temperature using temperature sensors; however, temperature changes lag behind the instantaneous changes in electrical variables, and heat transfer takes time. Therefore, using electronic instrument transformers can more accurately detect changes in transformers.

[0022] 2. The cooling oil in the oil conservator is supplied back to the oil-immersed transformer through the delivery pipe, thus realizing the circulation of the cooling oil. This prevents uneven temperature distribution of the cooling oil in the oil-immersed transformer and avoids the problem of poor heat dissipation effect inside the transformer, thereby ensuring the stable operation of the oil-immersed transformer.

[0023] 3. The movement of the piston drives the drive rod to move, which in turn drives the rack plate to move. The rack plate then drives the gear to rotate, which in turn drives the second rotating tube to rotate. This, in turn, drives the serpentine temperature control tube and the first rotating tube to rotate. In conjunction with the solenoid valve, the serpentine temperature control tube can reciprocate, which is beneficial for heat dissipation.

[0024] 4. Air is blown towards the rotating serpentine temperature control tube, which can achieve uniform and effective heat exchange and cooling. This can effectively cool the internal cooling oil. The cooled cooling oil circulates and can effectively dissipate heat from the oil-immersed transformer, thus ensuring the stable and safe operation of the oil-immersed transformer.

[0025] 5. As the serpentine temperature control tube rotates, it will cause the limit rod, short shaft, U-shaped block, and vertical rod to move upward. At this time, the second spring is stretched, and the movement of the vertical rod causes the connecting block to move upward, which in turn causes the elastic dust filter to tilt and move upward, so that the elastic dust filter is stretched. This can separate the dust that has clumped on the elastic dust filter from the elastic dust filter, thus achieving the separation of the clumped dust.

[0026] 6. As the serpentine thermostat continues to rotate, the limit rod and other components cannot move upwards. When the torque exceeds the torque of the torsion spring, the limit rod drives the short shaft to rotate, and the torsion spring generates torque. Eventually, the serpentine thermostat separates from the limit rod. Under the action of the torsion spring and the second spring, each part is reset, that is, the elastic dust filter is stretched and released. This also shakes off the filtered material and clumps of dust from the elastic dust filter, thus cleaning the elastic dust filter.

[0027] 7. When the serpentine temperature control tube reverses, the elastic dust filter can be stretched and released in the other direction, thereby effectively cleaning the elastic dust filter to ensure that air can pass through the elastic dust filter, thus ensuring stable heat dissipation of the cooling oil and ensuring stable operation of the oil-immersed transformer.

[0028] 8. The limiting rod is hung on the serpentine temperature control tube. The rotation of the serpentine temperature control tube drives the limiting rod, short shaft, U-shaped block, and spiral rod to move. The spiral rod moves upward and rotates in the through hole, thereby driving the connecting block to move upward and rotate. This in turn drives the elastic dust filter to roll up, tilt, and move upward, so that the elastic dust filter is stretched and rolled up. This reduces the contact area between the agglomerates and the elastic dust filter. With the rolled-up elastic dust filter, the dust can be separated from the elastic dust filter, thus achieving the separation of agglomerated dust.

[0029] In summary, this invention uses an electronic instrument transformer to measure current / voltage waveforms in real time, enabling real-time monitoring of the electrical variables of an oil-immersed transformer. Temperature sensors can also indirectly provide feedback on transformer changes by detecting oil temperature. However, temperature changes lag behind the instantaneous changes in electrical variables, and heat transfer requires time. The electronic instrument transformer allows for more accurate detection of transformer changes, and the electrical variable detector, combined with a temperature control mechanism, provides stable and effective heat dissipation for the oil-immersed transformer. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a power transformer monitoring device for a power distribution network according to Embodiment 1 of the present invention;

[0031] Figure 2 This is a rear view of a power transformer monitoring device for a power distribution network according to Embodiment 1 of the present invention;

[0032] Figure 3 This is a schematic diagram of the pump body in a power transformer monitoring device for a power distribution network according to Embodiment 1 of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the elastic dust filter in a power transformer monitoring device for a power distribution network according to Embodiment 1 of the present invention;

[0034] Figure 5 This is a schematic diagram of the internal structure of the mounting box in a power transformer monitoring device for a power distribution network according to Embodiment 1 of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the second spring in a power transformer monitoring device for a power distribution network according to Embodiment 1 of the present invention;

[0036] Figure 7 This is a schematic diagram of the piston cylinder in a power transformer monitoring device for a power distribution network according to Embodiment 1 of the present invention;

[0037] Figure 8 This is a schematic diagram of the disassembled piston cylinder structure in a power transformer monitoring device for power distribution networks according to Embodiment 1 of the present invention;

[0038] Figure 9This is a schematic diagram of a power transformer monitoring device for a power distribution network proposed in Embodiment 2 of the present invention.

[0039] In the diagram: 1. Oil-immersed transformer; 2. Bracket; 3. Oil tank; 4. Delivery pipe; 5. Electrical variable detector; 6. Mounting box; 7. Fan; 8. Return pipe; 9. First rotary joint; 10. First rotating pipe; 11. Inlet pipe; 12. Second rotating pipe; 13. Second rotary joint; 14. First oil delivery pipe; 15. Second oil delivery pipe; 16. Pump body; 17. Outlet pipe; 18. Elastic dust filter; 19. Connecting block; 20. Shaft; 21. Piston cylinder; 22. Second spring; 23. U-shaped block; 24. Short shaft; 25. Limiting rod; 26. Drive rod; 27. Rack plate; 28. Gear; 29. ​​First spring; 30. Moving piston; 31. Serpentine temperature control tube; 32. Vertical rod. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Example

[0041] Reference Figures 1-8 A power transformer monitoring device for a power distribution network includes an oil-immersed transformer 1. A bracket 2 is installed on one side of the oil-immersed transformer 1, and an oil conservator 3 is installed on the bracket 2. The oil conservator 3 is connected to the oil-immersed transformer 1 through a delivery pipe 4. An electrical variable detector 5 is installed on the oil-immersed transformer 1 to detect the internal oil temperature and monitor the oil-immersed transformer 1 in real time. The electrical variable detector 5 includes a controller, a temperature sensor, and an electronic instrument transformer. The electronic instrument transformer measures the current / voltage waveform in real time, which can provide real-time information on the electrical variables of the oil-immersed transformer 1. The temperature sensor can also indirectly provide feedback on the transformer's changes by detecting the oil temperature. However, temperature changes lag behind instantaneous changes in electrical variables (such as sudden load changes), and heat transfer takes time. Therefore, the electronic instrument transformer is used to more accurately detect changes in the transformer.

[0042] In addition, the temperature sensor can detect the temperature of the cooling oil inside the oil-immersed transformer 1 and transmit the signal to the controller, which then controls the pump body 16 and the fan 7 to work.

[0043] A temperature control mechanism controlled by an electrical variable detector 5 is installed on the bracket 2. This mechanism circulates and cools the internal cooling oil of the oil-immersed transformer 1. The temperature control mechanism includes a mounting box 6 installed at the bottom of the bracket 2. A serpentine temperature control tube 31 connected to the oil conservator 3 is installed inside the mounting box 6. A first rotating tube 10 and a second rotating tube 12, which are coaxially arranged, are fixedly connected to both ends of the serpentine temperature control tube 31. A first rotary joint 9 is installed at the end of the first rotating tube 10. A return pipe 8 is fixedly connected to the first rotary joint 9 and is connected to the oil conservator 3. A second rotary joint 13 is installed on the second rotating tube 12. A first oil supply pipe 14 and a second oil supply pipe 15 are connected to the second rotary joint 13. Check valves are installed on both the first oil supply pipe 14 and the second oil supply pipe 15. Both the first oil supply pipe 14 and the second oil supply pipe 15 are connected to the piston cylinder 21. A solenoid valve is installed on the first oil supply pipe 14, and the second oil supply pipe 15 is arranged opposite to the moving piston 30.

[0044] The mounting box 6 is equipped with a pump body 16 connected to the oil-immersed transformer 1 and the serpentine temperature control tube 31. The pump body 16 has an inlet pipe 11 at its inlet end, which is connected to the oil-immersed transformer 1 and is located near the bottom of the oil-immersed transformer 1. The pump body 16 has an outlet pipe 17 at its outlet end. The pump body 16 also includes a drive mechanism connected to the outlet pipe 17 and capable of driving the serpentine temperature control tube 31 to rotate. The drive mechanism includes a piston cylinder 21 installed in the mounting box 6 and connected to the outlet pipe 17. A movable piston 30 is slidably connected inside the piston cylinder 21. A first spring 29 is fixedly connected to the movable piston 30 and the piston cylinder 21. A drive rod 26 is fixedly connected to the movable piston 30. A rack plate 27 is fixedly connected to the drive rod 26. A first rotating tube 10 and a second rotating tube 12 both pass through the mounting box 6 and are rotatably connected to it. A gear 28 is installed on the second rotating tube 12, and the gear 28 meshes with the rack plate 27.

[0045] The operation of the pump body 16 enables the cooling oil to circulate within the oil-immersed transformer 1, the oil tank 3, and the serpentine temperature control tube 31. An elastic dust filter 18 is installed at the bottom of the mounting box 6, and a fan 7 is installed on the mounting box 6. When the fan 7 operates, air enters the mounting box 6 through the elastic dust filter 18 and blows onto the rotatable serpentine temperature control tube 31.

[0046] It also includes a cleaning mechanism for cleaning the elastic dust filter 18. The cleaning mechanism includes a shaft 20 rotatably installed in the mounting box 6. A vertical rod 32 is slidably connected to the shaft 20 and can be reset. A connecting block 19 is fixed to the bottom of the vertical rod 32. The connecting block 19 is fixedly connected to the elastic dust filter 18. A U-shaped block 23 is fixed to the upper end of the vertical rod 32. A second spring 22 is fixed to the bottom of the U-shaped block 23. The lower end of the second spring 22 is fixed to the shaft 20 and is sleeved on the outside of the vertical rod 32. A short shaft 24 that can be reset is rotatably connected inside the U-shaped block 23. Torsion springs are installed between the two ends of the short shaft 24 and the U-shaped block 23. When the torsion springs are stable, the limiting rod 25 is horizontally set. The limiting rod 25 is sleeved on the short shaft 24 and fixedly connected to it. The limiting rod 25 is configured to cooperate with the serpentine temperature control tube 31.

[0047] When this invention is used, the temperature of the cooling oil inside the oil-immersed transformer 1 can be detected by the temperature sensor, and the signal is transmitted to the controller. The controller controls the operation of the pump body 16 and the fan 7, that is, controls the speed of the pump body 16 and the fan 7.

[0048] Pump 16 operates to deliver the cooling oil in the oil-immersed transformer 1 to the piston cylinder 21 through the inlet pipe 11 and outlet pipe 17. As the cooling oil in the piston cylinder 21 increases, it drives the moving piston 30 to move. The moving piston 30 moves and causes the first spring 29 to move and be stretched. When the moving piston 30 no longer blocks the second oil delivery pipe 15, the cooling oil is delivered to the second rotary joint 13 through the second oil delivery pipe 15. The cooling oil is then delivered to the second rotating pipe 12 through the second rotary joint 13, and then to the serpentine temperature control pipe 31. The cooling oil flows back to the oil conservator 3 through the serpentine temperature control pipe 31, the first rotating pipe 10, the first rotary joint 9, and the return pipe 8. The cooling oil in the oil conservator 3 is then supplied to the oil-immersed transformer 1 again through the delivery pipe 4. This achieves the circulation of the cooling oil and prevents uneven temperature distribution of the cooling oil in the oil-immersed transformer 1, which would otherwise lead to poor heat dissipation inside the transformer.

[0049] To further explain, the temperature of the cooling oil near the coil is higher, while the temperature of the cooling oil near the outside of the oil-immersed transformer 1 is lower. The oil needs to be gradually cooled down through heat transfer, which reduces the effectiveness of internal heat dissipation. The above technical solution effectively solves the above technical problem, thereby enabling effective heat dissipation inside the oil-immersed transformer 1.

[0050] As the cooling oil circulates, its temperature eventually becomes almost uniform, thus requiring cooling.

[0051] Further explanation: The movement of the moving piston 30 drives the drive rod 26 to move, which in turn drives the rack plate 27 to move. The rack plate 27 then drives the gear 28 to rotate, which in turn drives the second rotating tube 12 to rotate. This, in turn, drives the serpentine temperature control tube 31 and the first rotating tube 10 to rotate. The operation of the fan 7 allows external air to enter the mounting box 6 through the elastic dust filter 18 and then be discharged by the fan 7. The air blows towards the rotating serpentine temperature control tube 31, thereby providing uniform and effective heat exchange and cooling. This effectively cools the internal cooling oil. The cooled cooling oil circulates, effectively dissipating heat from the oil-immersed transformer 1, thus ensuring the stable and safe operation of the oil-immersed transformer 1.

[0052] After a period of time, the solenoid valve opens, and the cooling oil in the piston cylinder 21 is delivered to the second rotary joint 13 through the second oil supply pipe 15. This reduces the pressure in the piston cylinder 21. Under the action of the first spring 29, the moving piston 30 is reset and the second oil supply pipe 15 is blocked. This, in turn, drives the drive rod 26 and the rack plate 27 to reset, realizing the reversal of the second rotating tube 12, the serpentine temperature control tube 31, and the first rotating tube 10. Then, the solenoid valve closes, and the rack plate 27 extends and moves again. This enables the second rotating tube 12, the serpentine temperature control tube 31, and the first rotating tube 10 to rotate back and forth, thereby effectively exchanging heat and cooling the cooling oil.

[0053] The solenoid valve is controlled by a controller, and a relay is installed on the solenoid valve to achieve its intermittent opening and closing.

[0054] Due to dust and windy weather in the external environment, after the dust is filtered by the elastic dust filter 18 and then exposed to windy and rainy weather, the dust will become damp and dry and then clump together. If it is not cleaned, the ventilation effect of the elastic dust filter 18 will be reduced, which in turn reduces the heat exchange and cooling effect on the cooling oil.

[0055] Among them, the elastic dust filter 18 can be made of composite fibers of nylon and spandex, which has the characteristics of ultra-soft elasticity, wear resistance, corrosion resistance and good breathability.

[0056] When the serpentine temperature control tube 31 rotates and abuts against the limiting rod 25, that is, when the limiting rod 25 is hung on the serpentine temperature control tube 31, the rotation of the serpentine temperature control tube 31 drives the limiting rod 25, the short shaft 24, the U-shaped block 23, and the vertical rod 32 to move, causing them to rotate around the shaft 20. As the serpentine temperature control tube 31 rotates, it will drive the limiting rod 25, the short shaft 24, the U-shaped block 23, and the vertical rod 32 to move upward. At this time, the second spring 22 is stretched, and the movement of the vertical rod 32 drives the connecting block 19 to move upward, which in turn drives the elastic dust filter 18 to tilt upward, so that the elastic dust filter 18 is stretched. In this way, the dust that is clumped on the elastic dust filter 18 can be separated from the elastic dust filter 18, thus achieving the separation of clumped dust.

[0057] As the serpentine temperature control tube 31 continues to rotate, the limiting rod 25 and other components cannot move upward. When the torque is greater than the torque of the torsion spring, the limiting rod 25 drives the short shaft 24 to rotate, and the torsion spring generates torque. Finally, the serpentine temperature control tube 31 separates from the limiting rod 25. Under the action of the torsion spring and the second spring 22, the various parts are reset, that is, the elastic dust filter 18 is stretched and released. It can also shake off the filtered material and clumps of dust from the elastic dust filter 18, thus cleaning the elastic dust filter 18.

[0058] When the serpentine temperature control tube 31 reverses, the elastic dust filter 18 can be stretched and released in the other direction, thereby effectively cleaning the elastic dust filter 18 to ensure that air can pass through the elastic dust filter 18, thus ensuring stable heat dissipation of the cooling oil and ensuring stable operation of the oil-immersed transformer 1.

[0059] If the oil temperature detected by the electrical variable detector 5 fails to reach the set temperature for an extended period of time, the fan 7 and pump body 16 will be in a non-working state. Example

[0060] Reference Figure 9 The difference between this embodiment and embodiment 1 is that, in this embodiment, a through hole 34 is provided through the shaft 20, and a spiral protrusion that cooperates with the spiral rod 33 is provided inside the through hole 34; a spiral rod 33 is provided through the through hole 34 and is connected to it; a connecting block 19 is fixed to the bottom of the spiral rod 33 and is fixedly connected to the elastic dust filter 18; a U-shaped block 23 is rotatably connected to the upper end of the spiral rod 33; a short shaft 24 is rotatably connected inside the U-shaped block 23; torsion springs are installed between both ends of the short shaft 24 and the U-shaped block 23; a limiting rod 25 is sleeved on the short shaft 24 and is fixedly connected to it; the limiting rod 25 is configured to cooperate with the serpentine temperature control tube 31; a second spring 22 is fixed to the bottom of the U-shaped block 23; the lower end of the second spring 22 is fixed to the shaft 20 and is sleeved on the outside of the spiral rod 33.

[0061] When the serpentine temperature control tube 31 rotates and abuts against the limiting rod 25, that is, when the limiting rod 25 is hung on the serpentine temperature control tube 31, the rotation of the serpentine temperature control tube 31 drives the limiting rod 25, the short shaft 24, the U-shaped block 23, and the spiral rod 33 to move, causing them to rotate around the shaft 20. As the serpentine temperature control tube 31 rotates, it will drive the limiting rod 25, the short shaft 24, the U-shaped block 23, and the spiral rod 33 to move upward. At this time, the second spring 22 is stretched, and the spiral rod 33 moves upward and rotates in the through hole 34, thereby driving the connecting block 19 to move upward and rotate, which in turn drives the elastic dust filter 18 to roll up, tilt, and move upward, so that the elastic dust filter 18 is stretched and rolled up. In this way, the contact area between the agglomerates and the elastic dust filter 18 can be reduced. With the rolled-up elastic dust filter 18, the dust can be separated from the elastic dust filter 18, thus achieving the separation of agglomerated dust.

[0062] This invention also discloses a method for monitoring power transformers in a power distribution network, comprising the following steps:

[0063] S1, through the electronic instrument transformer, measures the current / voltage waveform in real time, and can understand the electrical variables of the oil-immersed transformer 1 in real time;

[0064] S2, the temperature of the cooling oil in the oil-immersed transformer 1 can be detected by the electrical variable detector 5, and the signal is transmitted to the controller, which controls the pump body 16 and the fan 7 to work.

[0065] S3, after working for a period of time, the solenoid valve is intermittently opened and closed by the controller;

[0066] S4. If the variable oil temperature detected by the electrical variable detector 5 has not reached the set temperature for a long time, the blower 7 and the pump body 16 will be in a non-working state.

[0067] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A power transformer monitoring device for a power distribution network, comprising an oil-immersed transformer (1), wherein a bracket (2) is installed on one side of the oil-immersed transformer (1), an oil conservator (3) is installed on the bracket (2), and the oil conservator (3) is connected to the oil-immersed transformer (1) via a delivery pipe (4), characterized in that, The oil-immersed transformer (1) is equipped with an electrical variable detector (5) for detecting the internal oil temperature and real-time monitoring of the current / voltage waveform of the oil-immersed transformer (1). The bracket (2) is equipped with a temperature control mechanism controlled by the electrical variable detector (5) and capable of circulating and cooling the internal cooling oil of the oil-immersed transformer (1). The temperature control mechanism includes a mounting box (6) installed at the bottom of the bracket (2) and a serpentine temperature control tube (31) rotatably installed in the mounting box (6) and connected to the oil conservator (3). The cooling oil can circulate between the oil conservator (3) and the serpentine temperature control tube (31). 1) Circulation between; The bottom of the installation box (6) is equipped with an elastic dust filter (18) and a cleaning mechanism installed inside the installation box (6) and connected to the elastic dust filter (18). A fan (7) is installed on the installation box (6). The fan (7) works to make air enter the installation box (6) through the elastic dust filter (18) and blow it onto the rotatable serpentine temperature control tube (31). The cleaning mechanism is set in conjunction with the serpentine temperature control tube (31) so that the elastic dust filter (18) can be stretched and rolled up to reduce the contact area with the filtered material.

2. The power transformer monitoring device for a power distribution network according to claim 1, characterized in that, The mounting box (6) is equipped with a pump body (16) connected to the oil-immersed transformer (1) and the serpentine temperature control tube (31). The pump body (16) is able to circulate the cooling oil in the oil-immersed transformer (1), the oil tank (3) and the serpentine temperature control tube (31).

3. The power transformer monitoring device for a power distribution network according to claim 2, characterized in that, The pump body (16) is equipped with an inlet pipe (11) at the inlet end, which is connected to the oil-immersed transformer (1) and is located near the bottom of the oil-immersed transformer (1). The pump body (16) is equipped with an outlet pipe (17) at the outlet end.

4. The power transformer monitoring device for a power distribution network according to claim 3, characterized in that, It also includes a drive mechanism connected to the liquid outlet pipe (17) and capable of driving the serpentine temperature control tube (31) to rotate. The drive mechanism includes a piston cylinder (21) installed in the mounting box (6) and connected to the liquid outlet pipe (17). A movable piston (30) is slidably connected in the piston cylinder (21). A first spring (29) is fixedly connected to the movable piston (30) and the piston cylinder (21). A drive rod (26) is fixedly connected to the movable piston (30). A rack plate (27) is fixedly connected to the drive rod (26). A first rotating tube (10) and a second rotating tube (12) are fixedly connected to the two ends of the serpentine temperature control tube (31) respectively. The first rotating tube (10) and the second rotating tube (12) both pass through the mounting box (6) and are rotatably connected to it. A gear (28) is installed on the second rotating tube (12). The gear (28) meshes with the rack plate (27).

5. A power transformer monitoring device for a power distribution network according to claim 4, characterized in that, The first rotating tube (10) is equipped with a first rotating joint (9) at its end. A return pipe (8) is fixedly connected to the first rotating joint (9). The return pipe (8) is connected to the oil conservator (3). The second rotating tube (12) is equipped with a second rotating joint (13). The second rotating joint (13) is connected with a first oil supply pipe (14) and a second oil supply pipe (15). The first oil supply pipe (14) and the second oil supply pipe (15) are both connected to the piston cylinder (21). A solenoid valve is installed on the first oil supply pipe (14). The second oil supply pipe (15) is arranged opposite to the moving piston (30).

6. A power transformer monitoring device for a power distribution network according to claim 5, characterized in that, The cleaning mechanism includes a shaft (20) rotatably installed in the mounting box (6). A vertical rod (32) is slidably connected to the shaft (20) and can be reset. A connecting block (19) is fixed at the bottom of the vertical rod (32). The connecting block (19) is fixedly connected to the elastic dust filter (18). A U-shaped block (23) is fixed at the upper end of the vertical rod (32). A short shaft (24) that can be reset is rotatably connected inside the U-shaped block (23). A limiting rod (25) that is fixedly connected to the short shaft (24) is sleeved on it. The limiting rod (25) is configured to cooperate with the serpentine temperature control tube (31).

7. A power transformer monitoring device for a power distribution network according to claim 6, characterized in that, The bottom of the U-shaped block (23) is fixed with a second spring (22), the lower end of the second spring (22) is fixed on the shaft (20), and the second spring (22) is sleeved on the outside of the vertical rod (32).

8. A power transformer monitoring device for a power distribution network according to claim 7, characterized in that, Torsion springs are installed between both ends of the short shaft (24) and the U-shaped block (23). When the torsion springs are stable, the limiting rod (25) is set horizontally.

9. A power transformer monitoring device for a power distribution network according to claim 8, characterized in that, A through hole (34) is provided through the shaft (20), and a screw rod (33) is provided through the through hole (34) for connection. A connecting block (19) is fixed at the bottom of the screw rod (33). The connecting block (19) is fixedly connected to the elastic dust filter (18). A U-shaped block (23) is rotatably connected to the upper end of the screw rod (33). A short shaft (24) is rotatably connected inside the U-shaped block (23). Torsion springs are installed between the two ends of the short shaft (24) and the U-shaped block (23). A limiting rod (25) is fixedly connected to the short shaft (24). The limiting rod (25) is configured to cooperate with the serpentine temperature control tube (31). A second spring (22) is fixed at the bottom of the U-shaped block (23). The lower end of the second spring (22) is fixed on the shaft (20), and the second spring (22) is sleeved on the outside of the screw rod (33).

10. A method for monitoring power transformers in a power distribution network, applied to the power transformer monitoring device of claim 9, characterized in that, Includes the following steps: S1, by measuring the current / voltage waveform in real time through an electronic instrument transformer, can understand the electrical variables of the oil-immersed transformer (1) in real time; S2, through the electrical variable detector (5), can detect the temperature of the cooling oil in the oil-immersed transformer (1), and transmit the signal to the controller, which controls the pump (16) and the fan (7) to work. S3, after working for a period of time, the solenoid valve is intermittently opened and closed by the controller; S4. If the oil temperature detected by the electrical variable detector (5) does not reach the set temperature for a long time, the blower (7) and the pump body (16) are in a non-working state.

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