Power distribution network power transformer monitoring device and monitoring method

Abstract

The invention discloses a power distribution network power transformer monitoring device and method, and the device comprises an oil-immersed transformer, the oil-immersed transformer is provided with an electrical variable detector used for detecting the internal oil temperature, the current / voltage waveform is measured in real time, and the electrical variable of the oil-immersed transformer can be known in real time; the method comprises the following steps: S1, current / voltage waveforms are measured in real time through an electronic transformer, and electrical variables of the oil-immersed transformer can be known in real time; current / voltage waveforms are measured in real time through the electronic mutual inductor, the electrical variable of the oil-immersed transformer can be known in real time, the change of the transformer can be indirectly fed back by detecting the oil temperature through the temperature sensor, the change of the transformer can be more accurately detected in cooperation with the electronic mutual inductor, and the detection accuracy is improved. And the electric variable detector is matched with the temperature control mechanism, so that stable and effective heat dissipation of the oil-immersed transformer can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformer monitoring, and in particular to a power transformer monitoring device and method for power distribution networks. BACKGROUND

[0002] The oil-immersed transformer is a new type of high-performance transformer with more reasonable structure and better performance. An oil pillow is usually installed on the oil-immersed transformer, which can supply oil to the oil-immersed transformer. When the internal temperature of the oil-immersed transformer rises and expands, it will flow through the pipeline to the oil pillow, realizing "pressure relief" for the internal part of the oil-immersed transformer. The oil-immersed transformer can well dissipate heat from the transformer, but still needs to dissipate heat from the heat dissipation oil. Therefore, heat dissipation fins are installed on the outside of the oil-immersed transformer, and a fan is installed on the heat dissipation fins. The oil-immersed transformer is provided with a temperature monitoring device. When the oil temperature is high, the fan is controlled to work, and the fan dissipates heat from the heat dissipation fins that transfer the temperature, realizing heat dissipation of the oil temperature. However, the heat dissipation fins located on the outside will accumulate dust for a long time, resulting in a decrease in the heat dissipation effect, so that the temperature of the heat dissipation oil cannot be effectively controlled. Even if the speed of the fan can be controlled, the heat dissipation effect of the heat dissipation fins with accumulated dust is still poor.

[0003] The prior art self-cooled transformer with publication number CN119381118A is accelerated by a heat dissipation fan, and then flows through the surface of the coil pipe and the heat dissipation plate, which can dissipate heat from the coil pipe and the heat dissipation plate. However, it cannot effectively handle dust, so dust adheres to the coil pipe, which affects the heat exchange of the coil pipe, especially in outdoor environments with more cotton dust.

[0004] Therefore, the present application provides a power transformer monitoring device and method for power distribution networks. SUMMARY

[0005] The present application is to solve the above technical problems, and provides a power transformer monitoring device and method for power distribution networks.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The utility model provides a kind of power distribution network power transformer monitoring device, including oil-immersed transformer, one side of the oil-immersed transformer is equipped with support, oil pillow is installed on the support, the oil pillow is connected with oil-immersed transformer by conveying pipe, characterized by, electric variable detector for detecting internal oil temperature and real-time monitoring oil-immersed transformer current / voltage waveform is installed on the oil-immersed transformer, temperature control mechanism that can be circulated cooling to the heat dissipation oil in the oil-immersed transformer is controlled by electric variable detector and is installed on the support, the temperature control mechanism includes installation box installed at the bottom of support and serpentine temperature control pipe rotatably installed in installation box and connected with oil pillow, heat dissipation oil can be circulated between oil pillow, serpentine temperature control pipe;Elastic dust screen is installed on the bottom of installation box and cleaning mechanism is installed in installation box and connected with elastic dust screen, fan is installed on the installation box, the heat dissipation fan works so that air enters into installation box by elastic dust screen and is blown to rotatable serpentine temperature control pipe, the cleaning mechanism is arranged in cooperation with serpentine temperature control pipe, can make elastic dust screen be stretched and be wound, reduce the contact area with filter.

[0008] Preferably, the liquid inlet end of the pump body is provided with a liquid inlet pipe connected with the oil-immersed transformer, and the liquid inlet pipe is arranged close to the bottom of the oil-immersed transformer.

[0009] Preferably, the drive mechanism further includes a piston cylinder installed in the installation box and connected with the liquid outlet pipe, a moving piston slidably connected in the piston cylinder, a first spring fixedly connected with the moving piston and the piston cylinder, a drive rod fixedly connected with the moving piston, a rack plate fixedly connected with the drive rod, a first rotating pipe and a second rotating pipe coaxially arranged and fixedly connected with the ends of the serpentine temperature control pipe, the first rotating pipe and the second rotating pipe penetrating through the installation box and rotatably connected with the installation box, a gear fixedly connected with the second rotating pipe, and the gear engaged with the rack plate.

[0010] Preferably, the first rotating pipe is provided with a first rotary joint at the end thereof, the first rotary joint is fixedly connected with a return pipe connected with the oil pillow, the second rotating pipe is provided with a second rotary joint, the second rotary joint is connected with a first oil pipe and a second oil pipe, the first oil pipe and the second oil pipe are connected with the piston cylinder, the first oil pipe is provided with an electromagnetic valve, and the second oil pipe is arranged opposite to the moving piston.

[0011] Preferably, the cleaning mechanism capable of cleaning the elastic dust filter screen is further included, the cleaning mechanism comprises a shaft rod rotatably installed in the installation box, a vertical rod is arranged through the shaft rod and is slidably connected with the shaft rod and capable of resetting, a connecting block is fixed to the bottom of the vertical rod, the connecting block is fixedly connected with the elastic dust filter screen, a U-shaped block is fixed to the upper end of the vertical rod, a short shaft capable of resetting is rotatably connected in the U-shaped block, a limiting rod fixedly connected with the short shaft is sleeved on the short shaft, and the limiting rod is arranged in cooperation with the snake-shaped temperature control pipe.

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

[0013] Preferably, a torsion spring is arranged between the two ends of the short shaft and the U-shaped block, and the limiting rod is arranged horizontally in the stable state of the torsion spring.

[0014] Preferably, a through hole is arranged through the shaft rod, a screw rod is arranged through the through hole and is connected in cooperation, a connecting block is fixed to the bottom of the screw rod, the connecting block is fixedly connected with the elastic dust filter screen, a U-shaped block is rotatably connected to the upper end of the screw rod, a short shaft is rotatably connected in the U-shaped block, a torsion spring is arranged between the two ends of the short shaft and the U-shaped block, a limiting rod fixedly connected with the short shaft is sleeved on the short shaft, and the limiting rod is arranged in cooperation with the snake-shaped temperature control pipe; a second spring is fixed to the bottom of the U-shaped block, the lower end of the second spring is fixed on the shaft rod, and the second spring is arranged outside the screw rod.

[0015] The application further discloses a monitoring method of a power transformer of a power distribution network.

[0016] S1, the current / voltage waveform is measured in real time through the electronic mutual inductor, and the electric variable of the oil-immersed transformer can be understood in real time;

[0017] S2, the temperature of the heat dissipation oil in the oil-immersed transformer is detected through the electric variable detector, and the signal is transmitted to the controller, and the controller controls the pump body and the fan to work;

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

[0019] S4, if the oil temperature detected by the electric variable detector does not reach the set temperature for a long time, the fan and the pump body are in a non-working state.

[0020] Compared with the prior art, the application has the following beneficial effects:

[0021] 1. Real-time measurement of current / voltage waveform through electronic transformer can realize real-time understanding of the electrical variable of oil-immersed transformer; the change of transformer can also be indirectly fed back through the detection of oil temperature by temperature sensor; however, the temperature change lags behind the instantaneous change of electrical variable, and heat transfer needs time, so the electronic transformer can more accurately detect the change of transformer.

[0022] 2. The heat dissipation oil in the oil conservator is supplied to the oil-immersed transformer again through the conveying pipe, so that the circulation of the heat dissipation oil is realized, and the problem of uneven temperature distribution of the heat dissipation oil in the oil-immersed transformer and poor heat dissipation effect of the transformer is not caused, so as to ensure the stable operation of the oil-immersed transformer.

[0023] 3. The moving piston moves to drive the driving rod to move, the driving rod moves to drive the rack plate to move, the rack plate moves to drive the gear to rotate, the gear rotates to drive the second rotating pipe to rotate, and further drive the serpentine temperature control pipe and the first rotating pipe to rotate, which can realize the reciprocating rotation of the serpentine temperature control pipe in cooperation with the electromagnetic valve, and is conducive to heat dissipation.

[0024] 4. The air blows to the rotating serpentine temperature control pipe, so that the serpentine temperature control pipe can be uniformly and effectively heat-exchanged and cooled, so that the heat dissipation oil flowing inside can be effectively cooled, and the cooled heat dissipation oil can circulate to effectively cool the oil-immersed transformer, so as to ensure the stable and safe operation of the oil-immersed transformer.

[0025] 5. With the rotation of the serpentine temperature control pipe, the limiting rod, the short shaft, the U-shaped block and the vertical rod are lifted, at this time the second spring is stretched, the vertical rod moves to drive the connecting block to move upwards, and further drives the elastic dust filter screen to tilt and move upwards, so that the elastic dust filter screen is stretched, so that the dust and the elastic dust filter screen are separated, and the separation of the dust and the elastic dust filter screen is realized.

[0026] 6. With the continuous rotation of the serpentine temperature control pipe, the limiting rod and the like cannot be lifted at this time, when the torsion is greater than the torsion of the torsional spring, the limiting rod drives the short shaft to rotate, the torsional spring generates torque, and finally the serpentine temperature control pipe and the limiting rod are separated, under the action of the torsional spring and the second spring, the reset of each part is realized, that is, the elastic dust filter screen is stretched and released, and the elastic dust filter screen can also shake off the dust and the dust of the dust cake, and the cleaning of the elastic dust filter screen is realized.

[0027] 7. When the serpentine temperature control pipe reverses, the elastic dust filter screen can be stretched and released in the other direction, so that the elastic dust filter screen can be effectively cleaned, so that the air can pass through the elastic dust filter screen, so that the heat dissipation oil can be stably cooled, and the stable operation of the oil-immersed transformer is ensured.

[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 9A schematic view of a power transformer monitoring device for a power distribution network is provided for embodiment 2 of the present application.

[0039] In the figure: 1 oil-immersed transformer, 2 support, 3 oil pillow, 4 conveying pipe, 5 electric variable detector, 6 installation box, 7 fan, 8 return pipe, 9 first rotary joint, 10 first rotating pipe, 11 liquid inlet pipe, 12 second rotating pipe, 13 second rotary joint, 14 first oil feeding pipe, 15 second oil feeding pipe, 16 pump body, 17 liquid outlet pipe, 18 elastic dust filter screen, 19 connecting block, 20 shaft rod, 21 piston cylinder, 22 second spring, 23 U-shaped block, 24 short shaft, 25 limiting rod, 26 driving rod, 27 rack plate, 28 gear, 29 first spring, 30 moving piston, 31 serpentine temperature control pipe, 32 vertical rod. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0041] Embodiment 1

[0042] Reference Figures 1-8 A power transformer monitoring device for a power distribution network includes an oil-immersed transformer 1, a support 2 is installed on one side of the oil-immersed transformer 1, an oil pillow 3 is installed on the support 2, the oil pillow 3 is connected with the oil-immersed transformer 1 through a conveying pipe 4, an electric variable detector 5 for detecting the internal oil temperature and monitoring the oil-immersed transformer 1 in real time is installed on the oil-immersed transformer 1, the electric variable detector 5 includes a controller, a temperature sensor and an electronic transformer, the current / voltage waveform is measured in real time through the electronic transformer, and the electric variable of the oil-immersed transformer 1 can be understood in real time; the change of the transformer can also be indirectly fed back through the oil temperature detected by the temperature sensor; however, the temperature change lags behind the instantaneous change of the electric variable (such as sudden change of load), heat transfer needs time, and the electronic transformer is more accurate in detecting the change of the transformer.

[0043] In addition, the temperature of the heat dissipation oil in the oil-immersed transformer 1 can be detected through the temperature sensor, and the signal is transmitted to the controller, and the controller controls the pump body 16 and the fan 7 to work.

[0044] The bracket 2 is provided with a temperature control mechanism capable of circulating and cooling the heat dissipation oil in the oil-immersed transformer 1, which is controlled by an electric variable detector 5. The temperature control mechanism comprises a mounting box 6 mounted on the bottom of the bracket 2, a serpentine temperature control pipe 31 connected with the oil pillow 3 mounted in the mounting box 6, coaxial first and second rotating pipes 10, 12 fixedly connected at both ends of the serpentine temperature control pipe 31, a first rotary joint 9 mounted at the end of the first rotating pipe 10, a return pipe 8 fixedly connected with the first rotary joint 9, the return pipe 8 being connected with the oil pillow 3, a second rotary joint 13 mounted on the second rotating pipe 12, first and second oil feeding pipes 14, 15 connected with the second rotary joint 13, check valves mounted on the first and second oil feeding pipes 14, 15, the first and second oil feeding pipes 14, 15 being connected with a piston cylinder 21, an electromagnetic valve mounted on the first oil feeding pipe 14, and the second oil feeding pipe 15 being arranged opposite to a moving piston 30.

[0045] The mounting box 6 is provided with a pump body 16 connected with the oil-immersed transformer 1 and the serpentine temperature control pipe 31, a liquid inlet pipe 11 mounted at the liquid inlet end of the pump body 16, the liquid inlet pipe 11 being connected with the oil-immersed transformer 1 and arranged close to the bottom of the oil-immersed transformer 1, a liquid outlet pipe 17 mounted at the liquid outlet end of the pump body 16, and a driving mechanism connected with the liquid outlet pipe 17 and capable of driving the serpentine temperature control pipe 31 to rotate, the driving mechanism comprising the piston cylinder 21 mounted in the mounting box 6 and connected with the liquid outlet pipe 17, the moving piston 30 slidably connected in the piston cylinder 21, the first spring 29 fixedly connected with the piston cylinder 21 and the moving piston 30, the driving rod 26 fixedly connected with the moving piston 30, the rack plate 27 fixedly connected with the driving rod 26, the first and second rotating pipes 10, 12 penetrating through the mounting box 6 and rotatably connected therewith, the gear 28 mounted on the second rotating pipe 12 and engaged with the rack plate 27.

[0046] The pump body 16 is capable of circulating and flowing the heat dissipation oil in the oil-immersed transformer 1, the oil pillow 3 and the serpentine temperature control pipe 31. The bottom of the mounting box 6 is provided with an elastic dust filter screen 18, and the mounting box 6 is provided with a fan 7. The fan 7 is capable of making air enter into the mounting box 6 through the elastic dust filter screen 18 and blow to the rotatable serpentine temperature control pipe 31.

[0047] The cleaning mechanism capable of cleaning the elastic dust filter screen 18 comprises a shaft rod 20 rotatably installed in the installation box 6, a vertical rod 32 penetratingly arranged on the shaft rod 20 and capable of resetting, a connecting block 19 fixed to the bottom of the vertical rod 32, the connecting block 19 being fixedly connected with the elastic dust filter screen 18, a U-shaped block 23 fixed to the upper end of the vertical rod 32, a second spring 22 fixed to the bottom of the U-shaped block 23, the lower end of the second spring 22 being fixed on the shaft rod 20 and the second spring 22 being arranged outside the vertical rod 32, a short shaft 24 rotatably connected in the U-shaped block 23 and capable of resetting, torsion springs arranged between the two ends of the short shaft 24 and the U-shaped block 23, the limiting rods 25 being horizontally arranged in the stable state of the torsion springs, the limiting rods 25 being arranged on the short shaft 24 and fixedly connected with the short shaft 24, and the limiting rods 25 being arranged in cooperation with the serpentine temperature control pipe 31.

[0048] When the oil-immersed transformer 1 is used, the temperature of the heat dissipation oil in the oil-immersed transformer 1 can be detected by the temperature sensor, and the signal is transmitted to the controller, and the controller controls the working of the pump body 16 and the fan 7, that is, the gear of the pump body 16 and the fan 7 is controlled.

[0049] When the pump body 16 works, the heat dissipation oil in the oil-immersed transformer 1 is transported into the piston cylinder 21 through the liquid inlet pipe 11 and the liquid outlet pipe 17, and the heat dissipation oil in the piston cylinder 21 drives the moving piston 30 to move, the moving piston 30 drives the first spring 29 to move and be elongated, when the moving piston 30 no longer shields the second oil delivery pipe 15, the heat dissipation oil is transported into the second rotating joint 13 through the second oil delivery pipe 15, and then is transported into the second rotating pipe 12 through the second rotating joint 13, and then is transported into the serpentine temperature control pipe 31, and then is returned to the oil pillow 3 through the serpentine temperature control pipe 31, the first rotating pipe 10, the first rotating joint 9 and the return pipe 8, and then is supplied to the oil-immersed transformer 1 again through the delivery pipe 4, so that the circulation of the heat dissipation oil is realized, and the problem of uneven temperature distribution of the heat dissipation oil in the oil-immersed transformer 1 and poor heat dissipation effect of the transformer is solved.

[0050] Further explanation, the temperature of the heat dissipation oil close to the wire group is higher, and the temperature of the heat dissipation oil close to the outside of the shell of the oil-immersed transformer 1 is low, and heat transfer is needed to gradually transfer the temperature to realize cooling, which reduces the heat dissipation effect of the inside, and the above technical scheme effectively solves the above technical problem, so that the inside of the oil-immersed transformer 1 can be effectively cooled.

[0051] With the circulation of the heat dissipation oil, the temperature of the heat dissipation oil is almost uniform, so the heat dissipation of the heat dissipation oil is needed.

[0052] Further explanation: the movement of the piston 30 drives the movement of the drive rod 26, the movement of the drive rod 26 drives the movement of the rack plate 27, the movement of the rack plate 27 drives the rotation of the gear 28, the rotation of the gear 28 drives the rotation of the second rotating pipe 12, and the rotation of the second rotating pipe 12 drives the rotation of the serpentine temperature control pipe 31 and the first rotating pipe 10. The operation of the fan 7 can make the external air enter the installation box 6 through the elastic dust filter net 18, and then be discharged through the fan 7. The air blows to the rotating serpentine temperature control pipe 31, so that the serpentine temperature control pipe 31 can be uniformly and effectively heat-exchanged and cooled, so that the flowing cooling oil can be effectively cooled, and the cooled cooling oil can circulate to effectively cool the oil-immersed transformer 1, so that the oil-immersed transformer 1 can work stably and safely.

[0053] After a period of time, the electromagnetic valve is opened, the cooling oil in the piston cylinder 21 is transported to the second rotating joint 13 through the second oil delivery pipe 15, so that the pressure in the piston cylinder 21 is reduced, and the first spring 29 is used to reset the moving piston 30 and block the second oil delivery pipe 15, so that the drive rod 26 and the rack plate 27 are reset, and the second rotating pipe 12, the serpentine temperature control pipe 31 and the first rotating pipe 10 are reversed. Then, the electromagnetic valve is closed, the rack plate 27 is extended again, so that the second rotating pipe 12, the serpentine temperature control pipe 31 and the first rotating pipe 10 can rotate back and forth, so that the cooling oil can be effectively heat-exchanged and cooled.

[0054] The electromagnetic valve is controlled by the controller, and a relay is installed on the electromagnetic valve to realize intermittent opening and closing.

[0055] Due to the dust and rainy weather in the external environment, after the elastic dust filter net 18 filters the dust, the dust is wet and dried after the rainy weather, and the dust will condense into blocks after drying. If it is not cleaned, the ventilation effect of the elastic dust filter net 18 will be reduced, and the heat exchange and cooling effect of the cooling oil will be reduced.

[0056] The elastic dust filter net 18 can be made of nylon and spandex composite fiber, which has super soft stretchability, wear resistance, corrosion resistance, good air permeability and other characteristics.

[0057] When the serpentine temperature control pipe 31 rotates and abuts against the limiting rod 25, the limiting rod 25 is hung on the serpentine temperature control pipe 31, the serpentine temperature control pipe 31 rotates to drive the limiting rod 25, the short shaft 24, the U-shaped block 23 and the vertical rod 32 to move, so that they rotate around the shaft rod 20. With the rotation of the serpentine temperature control pipe 31, the limiting rod 25, the short shaft 24, the U-shaped block 23 and the vertical rod 32 will move upwards, and the second spring 22 will be stretched at this time. The vertical rod 32 moves to drive the connecting block 19 to move upwards, and then drives the elastic dust filter net 18 to tilt and move upwards, so that the elastic dust filter net 18 is stretched. In this way, the dust blocks can be separated from the elastic dust filter net 18, and the separation of the dust blocks can be realized.

[0058] With the continued rotation of the serpentine temperature control pipe 31, the limiting rod 25 and the like cannot move up at this time, and when the torsion is greater than the torsion of the torsion spring, the limiting rod 25 drives the short shaft 24 to rotate, the torsion spring generates a torque, and finally the serpentine temperature control pipe 31 is separated from the limiting rod 25. Under the action of the torsion spring and the second spring 22, the reset of each part is realized, that is, the elastic dust filter screen 18 is stretched and released, and the elastic dust filter screen 18 can also shake off the filtered material and the caked dust, realizing the cleaning of the elastic dust filter screen 18.

[0059] When the serpentine temperature control pipe 31 is reversed, the elastic dust filter screen 18 can be stretched and released in the other direction, so that the elastic dust filter screen 18 can be effectively cleaned to ensure that air can pass through the elastic dust filter screen 18, so that the heat dissipation oil can be stably cooled, and the stable operation of the oil-immersed transformer 1 is ensured.

[0060] If the oil temperature detected by the electric variable detector 5 does not reach the set temperature for a long time, the fan 7 and the pump body 16 are in a non-working state at this time.

[0061] Embodiment 2

[0062] Reference Figure 9 The difference between the present embodiment and embodiment 1 is that a through hole 34 is provided on the shaft rod 20 in the present embodiment, and a spiral protrusion cooperating with the spiral rod 33 is arranged in the through hole 34; a spiral rod 33 is arranged in the through hole 34 in a matched connection, the bottom of the spiral rod 33 is fixed with a connecting block 19, the connecting block 19 is fixedly connected with the elastic dust filter screen 18, the upper end of the spiral rod 33 is rotatably connected with a U-shaped block 23, the U-shaped block 23 is rotatably connected with a short shaft 24, torsion springs are arranged between the two ends of the short shaft 24 and the U-shaped block 23, a limiting rod 25 fixedly connected with the short shaft 24 is arranged on the short shaft 24, and the limiting rod 25 is arranged in cooperation with the serpentine temperature control pipe 31; 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 rod 20, and the second spring 22 is arranged outside the spiral rod 33.

[0063] When the serpentine temperature control pipe 31 rotates and abuts against the limiting rod 25, that is, the limiting rod 25 is hung on the serpentine temperature control pipe 31, the serpentine temperature control pipe 31 drives the limiting rod 25, the short shaft 24, the U-shaped block 23 and the spiral rod 33 to move, so that they rotate around the shaft rod 20. With the rotation of the serpentine temperature control pipe 31, the limiting rod 25, the short shaft 24, the U-shaped block 23 and the spiral rod 33 move upwards, the second spring 22 is stretched at this time, the spiral rod 33 moves upwards and rotates in the through hole 34, thereby driving the connecting block 19 to move upwards and rotate, and further driving the elastic dust filter screen 18 to be wound, tilted and moved upwards, so that the elastic dust filter screen 18 is stretched and wound. In this way, the contact area between the caked dust and the elastic dust filter screen 18 can be reduced, and the dust can be separated from the elastic dust filter screen 18 in cooperation with the wound elastic dust filter screen 18, so as to realize the separation of the caked dust.

[0064] The application further discloses a monitoring method of a power transformer of a power distribution network.

[0065] S1, the current / voltage waveform is measured in real time through the electronic mutual inductor, and the electric variable of the oil-immersed transformer 1 can be understood in real time;

[0066] S2, the temperature of the heat dissipation oil in the oil-immersed transformer 1 is detected through the electric variable detector 5, signals are transmitted to the controller, and the controller controls the pump body 16 and the fan 7 to work;

[0067] S3, after working for a period of time, the electromagnetic valve is intermittently opened and closed under the control of the controller;

[0068] S4, if the oil temperature detected by the electric variable detector 5 does not reach the set temperature for a long time, the fan 7 and the pump body 16 are in a non-working state.

[0069] The above merely describes the preferred embodiments of the application, but the protection scope of the application is not limited to this. Any person skilled in the art can make equivalent replacements or changes to the technical scheme and the inventive concept of the application within the technical range disclosed by the application, and all of them should be covered in the protection scope of the application.

Claims

1. A power transformer monitoring device for distribution network, comprising an oil-immersed transformer (1), a support (2) is installed on one side of the oil-immersed transformer (1), an oil pillow (3) is installed on the support (2), and the oil pillow (3) is connected with the oil-immersed transformer (1) through a conveying pipe (4), characterized in that, The oil-immersed transformer (1) is provided with an electric variable detector (5) for detecting the internal oil temperature and monitoring the current / voltage waveform of the oil-immersed transformer (1) in real time, the support (2) is provided with a temperature control mechanism capable of circulating and cooling the heat dissipation oil in the oil-immersed transformer (1) and controlled by the electric variable detector (5), the temperature control mechanism comprises a mounting box (6) mounted at the bottom of the support (2) and a serpentine temperature control pipe (31) rotatably mounted in the mounting box (6) and connected with the oil pillow (3), and the heat dissipation oil can circulate between the oil pillow (3) and the serpentine temperature control pipe (31); the bottom of the mounting box (6) is provided with an elastic dust filter screen (18) and a cleaning mechanism mounted in the mounting box (6) and connected with the elastic dust filter screen (18), a fan (7) is mounted on the mounting box (6), and the heat dissipation fan (7) works to make air enter the mounting box (6) through the elastic dust filter screen (18) and blow on the rotatable serpentine temperature control pipe (31), and the cleaning mechanism is arranged in cooperation with the serpentine temperature control pipe (31) and can stretch and wind the elastic dust filter screen (18) to reduce the contact area with the filter.

2. The power transformer monitoring device for power distribution network according to claim 1, characterized in that, A pump body (16) connected with the oil-immersed transformer (1) and the serpentine temperature control pipe (31) is mounted on the mounting box (6), and the pump body (16) can make the heat dissipation oil circulate in the oil-immersed transformer (1), the oil pillow (3) and the serpentine temperature control pipe (31).

3. The power transformer monitoring device for power distribution networks according to claim 2, characterized in that, A liquid inlet pipe (11) is mounted at the liquid inlet end of the pump body (16), the liquid inlet pipe (11) is connected with the oil-immersed transformer (1), and the liquid inlet pipe (11) is arranged close to the bottom of the oil-immersed transformer (1), and a liquid outlet pipe (17) is mounted at the liquid outlet end of the pump body (16).

4. The power transformer monitoring device for power distribution networks according to claim 3, characterized in that, A driving mechanism connected with the liquid outlet pipe (17) and capable of driving the serpentine temperature control pipe (31) to rotate is further included, the driving mechanism comprises a piston cylinder (21) mounted in the mounting box (6) and connected with the liquid outlet pipe (17), a movable piston (30) slidably connected in the piston cylinder (21), a first spring (29) fixedly connected between the movable piston (30) and the piston cylinder (21), a driving rod (26) fixedly connected to the movable piston (30), a rack plate (27) fixedly connected to the driving rod (26), coaxially arranged first and second rotating pipes (10) and (12) fixedly connected at both ends of the serpentine temperature control pipe (31), the first and second rotating pipes (10) and (12) penetrate through and are rotatably connected with the mounting box (6), a gear (28) mounted on the second rotating pipe (12), and the gear (28) is engaged with the rack plate (27).

5. The power transformer monitoring device for power distribution networks according to claim 4, characterized in that, The end of the first rotating pipe (10) is provided with a first rotary joint (9), the first rotary joint (9) is fixedly connected with a return pipe (8), the return pipe (8) is connected with an oil pillow (3), the second rotating pipe (12) is provided with a second rotary joint (13), the second rotary joint (13) is connected with a first oil feeding pipe (14) and a second oil feeding pipe (15), the first oil feeding pipe (14) and the second oil feeding pipe (15) are connected with a piston cylinder (21), the first oil feeding pipe (14) is provided with an electromagnetic valve, and the second oil feeding pipe (15) is oppositely arranged with a moving piston (30).

6. The power transformer monitoring device for power distribution networks according to claim 5, characterized in that, The cleaning mechanism comprises a shaft rod (20) rotatably arranged in the mounting box (6), a vertical rod (32) penetrating through the shaft rod (20) and being in sliding connection with the shaft rod (20) and capable of resetting, a connecting block (19) fixed to the bottom of the vertical rod (32), the connecting block (19) being fixedly connected with the elastic dust filter net (18), a U-shaped block (23) fixed to the upper end of the vertical rod (32), a short shaft (24) rotatably connected in the U-shaped block (23) and capable of resetting, a limiting rod (25) sleeved with the short shaft (24) and being fixedly connected with the short shaft (24), and the limiting rod (25) being cooperatively arranged with the snake-shaped temperature control pipe (31).

7. The power transformer monitoring device for power distribution networks 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 rod (20), and the second spring (22) is arranged outside the vertical rod (32).

8. The power transformer monitoring device for power distribution networks according to claim 7, characterized in that, Torsional springs are arranged between the two ends of the short shaft (24) and the U-shaped block (23), and the limiting rod (25) is horizontally arranged in the stable state of the torsional springs.

9. The power transformer monitoring device for power distribution networks according to claim 8, characterized in that, The shaft rod 20 is provided with a through hole 34 penetrating through the shaft rod 20, a screw rod 33 is penetratingly arranged in the through hole 34 and is in cooperative connection, a connecting block 19 is fixed to the bottom of the screw rod 33, the connecting block 19 is fixedly connected with the elastic dust filter net 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 in the U-shaped block 23, torsional springs are arranged between the two ends of the short shaft 24 and the U-shaped block 23, a limiting rod 25 is sleeved with the short shaft 24 and is fixedly connected with the short shaft 24, and the limiting rod 25 is cooperatively arranged with the snake-shaped temperature control pipe 31. 10.A method for monitoring a power transformer of a power distribution network, applied to the power transformer monitoring device of claim 9, characterized in that, The following steps are included: S1, the current / voltage waveform is measured in real time through the electronic mutual inductor, and the electrical variable of the oil-immersed transformer (1) can be understood in real time; S2, the temperature of the heat dissipation oil in the oil-immersed transformer (1) can be detected through the electrical variable detector (5), and the signal is transmitted to the controller, and the controller controls the pump body (16) and the fan (7) to work; S3, after working for a period of time, the electromagnetic valve is controlled to be 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 fan (7) and the pump body (16) are in a non-working state at this time.

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