A device and method for monitoring DC bias magnetic field of a transformer

Abstract

The present invention relates to the field of transformers and specifically discloses a transformer DC bias monitoring device and method, comprising an acquisition module, a monitoring module, and a control module. The acquisition module is configured to acquire target parameters corresponding to the transformer and transmit the target parameters to the monitoring module. The target parameters include at least one of the DC component of the transformer node, the surface temperature of and surrounding area of the transformer ground bar, and the vibration amplitude of the transformer ground bar. The monitoring module is configured to receive the target parameters, verify the accuracy of the target parameters according to preset verification operation rules, and transmit the verification results to the control module. The control module is configured to receive and display the verification results. In the present invention, when the temperature inside the box is too high, the box lid automatically opens, facilitating maintenance work within the box.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a device and method for monitoring direct current magnetic bias of a transformer. Background Art

[0002] In recent years, ultra-high voltage direct current (UHVDC) transmission (UHVDC) has gained widespread adoption in long-distance power transmission in my country due to its high efficiency and cost-effectiveness. my country's UHVDC technology has reached internationally advanced levels. With the increasing number of DC transmission lines coming into operation, my country's power grid is experiencing a new era of coexistence of AC and DC systems. The impact of DC transmission in single-pole loops and bipolar unbalanced operation on transformers in AC transmission systems is becoming increasingly serious. Monitoring transformer DC bias and addressing its effects have become a growing consensus among scholars and experts.

[0003] When a DC component flows through a transformer winding, this DC magnetic flux causes severe saturation of the transformer core, highly distorting the excitation current and generating a large number of harmonics. This increases the transformer's reactive power losses and metal structural losses, leading to localized overheating, insulation breakdown, and damage to the transformer, or shortening its service life. Existing monitoring devices independently detect vibration, heat generation, and current changes in the transformer, resulting in relatively sparse data. This data cannot be properly verified, making it impossible to determine its accuracy. Any deviations in the detection process can affect the accuracy of the test results. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides a transformer DC bias monitoring device and method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A transformer DC bias magnetic monitoring device and method includes an acquisition module, a monitoring module and a control module.

[0007] The acquisition module is used to acquire target parameters corresponding to the transformer and send the target parameters to the monitoring module; wherein the target parameters include: at least one of the DC component of the transformer node, the surface temperature of the transformer ground bar and its surroundings, and the vibration amplitude of the transformer ground bar;

[0008] The monitoring module is used to receive the target parameter, verify the accuracy of the target parameter according to a preset verification operation rule, and send the verification result to the control module;

[0009] The control module is used to receive and display the inspection result.

[0010] Preferably, the acquisition module includes a current induction unit, a temperature induction unit, and a vibration induction unit;

[0011] The current induction unit is used to collect the DC component of the transformer node and send the collected DC component to the monitoring module;

[0012] The temperature induction unit is used to collect the temperature on and around the grounding bar surface and send the collected temperature to the monitoring module;

[0013] The vibration induction unit is used to collect the vibration amplitude of the grounding bar and send the collected vibration amplitude to the monitoring module.

[0014] The calibration operation rule preset by the monitoring module is:

[0015] Z is the value after the target parameter is calibrated, W is the preset balance coefficient, Y1 is the voltage value obtained by current induction monitoring, Y2 is the temperature value obtained by temperature induction monitoring, Y3 is the vibration frequency value obtained by vibration induction monitoring, A is the proportion of voltage influence; B is the proportion of temperature influence, C is the proportion of vibration frequency influence, and A, B, and C are all preset values;

[0016] When U1 ≤ Z ≤ U2, the transformer is in a normal working state; when U1 < U2 < Z or Z < U1 < U2, the transformer is in an abnormal working state, and U1 and U2 are preset standard comparison values.

[0017] Preferably, this monitoring device is used to install the acquisition module, and this monitoring device includes a box body. One end of the top of the box body is rotatably installed with a box cover. An installation shell is installed on the top of the box cover, and the installation shell is internally connected to the box cover. An adjusting mechanism is installed inside the box body. C-shaped mounting plates are installed on the sides of the box body and the box cover. One of the mounting plates is fixed on the side of the box body, and the two mounting plates are in contact with each other. Installation grooves are opened on the opposite surfaces of the two mounting plates. A monitoring mechanism is installed inside the installation grooves. Placing grooves are opened at one end of the opposite surfaces of the box body and the box cover. A protection mechanism is installed inside one of the placing grooves, and one end of the protection mechanism is located inside the other placing groove.

[0018] Preferably, the adjusting mechanism includes a placing plate. A screw hole is opened on the top of the placing plate, and the screw hole penetrates through the placing plate and the box body. A matching bolt is installed in the screw hole. A support plate is fixedly installed on the bolt, and the support plate is located at the bottom of the placing plate. An open-type current transformer body is installed at one end of the top of the placing plate, and a temperature sensor body is installed at the other end of the top of the placing plate.

[0019] Preferably, a grounding bar is installed inside the box body, and the grounding bar is located inside the retractable transformer body, the two ends of the grounding bar respectively pass through the two mounting grooves, and the temperature sensor body is located below the grounding bar, and sliding grooves are provided on the inner walls on both sides of the box body, and sliders are slidably installed in the two sliding grooves, and the two sliders are respectively installed on both sides of the placement plate at one end away from the inner wall of the box body.

[0020] Preferably, the monitoring mechanism includes a U-shaped lifting plate, and a plurality of first springs are installed at the bottom of the lifting plate, and one end of the first spring away from the lifting plate is installed at the inner bottom of the mounting groove, and the three-axis vibration sensor body is installed at both ends of the top of the lifting plate, and L-shaped limit plates are installed at both ends of the inner bottom of the mounting groove, and the two limit plates are respectively located at both ends of the lifting plate, and both ends of the grounding bar are located between the top of the limit plate and the lifting plate, and the top of the three-axis vibration sensor body is abutted against the bottom of the grounding bar.

[0021] Preferably, the protective mechanism includes a rubber bag, and the rubber bag is fixed at one end of the bottom of the box cover, and the two sides of the rubber bag away from the box cover are respectively abutted against the inner walls of the placement grooves on the two mounting plates, and two second springs are installed at the bottom of the box cover, and the two second springs are respectively located at both ends of the rubber bag, and the end of the second spring away from the box cover is abutted against the top of the box body.

[0022] Preferably, a connecting rod is installed on the top of the mounting shell, the bottom end of the connecting rod passes through the mounting shell and is installed with a connecting plate, the connecting plate is installed on the inner top of the mounting shell, a limiting ring is installed on the top of the connecting rod, two connecting holes are opened on the top of the connecting rod, the connecting holes pass through the connecting rod and are connected to the connecting plate, a protective shell is slidably installed on the connecting rod, and the mounting shell is located inside the protective shell, and the limiting ring is located above the protective shell.

[0023] Preferably, a plurality of mounting holes are provided through the outer wall of the mounting shell, a protective net is installed on the inner walls of the plurality of mounting holes, a plurality of through holes are provided on the outer wall of the protective net, a card slot is provided on the bottom of the inner wall of the protective shell between two adjacent through holes, a card block is slidably installed inside the card slot, and the end of the card block away from the inner wall of the protective shell is installed at the bottom of the outer wall of the mounting shell, and the card block is located below the mounting hole.

[0024] Preferably, a circuit board is installed on the inner bottom of the box body, and the split-type mutual inductor body, the three-axis vibration sensor body and the temperature sensor body are all electrically connected to the connecting plate through the circuit board.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. In the present invention, the temperature sensor body inside the box serves as the primary monitoring basis for transformer DC bias monitoring. The three-axis vibration sensor body and the split-type transformer body assist the temperature sensor body in monitoring the transformer DC bias. The monitoring results of the three-axis vibration sensor body and the split-type transformer body can be used to verify the accuracy of the temperature sensor body's results. During use, the transformer DC bias monitoring results can be verified by comparing the ratio of the monitored values. This can also be used to verify the monitoring results when monitoring the DC bias current component of the transformer grounding bar. This makes transformer DC bias monitoring more accurate during use.

[0027] 2. The high-temperature gas inside the box can soften the rubber on the rubber bag located between the two mounting plates. The friction between the inner walls of the two placement grooves and the surface of the rubber bag will be reduced, and the two second springs will push the box cover to move upward. Because the surface of the rubber bag softens, the end of the rubber bag away from the box cover moves out of the placement groove. The second spring will push the box cover to rotate, so that the high-temperature gas inside the box is quickly discharged to the outside. When in use, the temperature inside the box can be quickly cooled to prevent the high-temperature gas inside the box from damaging the grounding bar and monitor.

[0028] 3. When the temperature inside the box body is too high, the box cover can automatically open and rotate. When the staff is inspecting the inside of the box body, there is no need for the staff to remove the box cover, so that the staff can repair the inside of the box body as quickly as possible, which can save a lot of time when used. In addition, the rubber bag can come into contact with the outside air when the box cover rotates, so that the rubber bag will harden again, which is convenient for the staff to install the box cover again after inspecting the inside of the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a system diagram of a transformer DC bias monitoring device and method proposed by the present invention;

[0030] Figure 2 This is a system diagram of an acquisition module of a transformer DC bias monitoring device and method proposed by the present invention;

[0031] Figure 3 A perspective view of a transformer DC bias monitoring device and method proposed by the present invention;

[0032] Figure 4 This is a schematic diagram of the internal structure of a box body of a transformer DC bias magnetic monitoring device and method proposed by the present invention;

[0033] Figure 5 This is a schematic diagram of the temperature sensor installation structure of a transformer DC bias monitoring device and method proposed by the present invention;

[0034] Figure 6A cross-sectional view of a box body of a transformer DC bias magnetic monitoring device and method proposed by the present invention;

[0035] Figure 7 A cross-sectional view of a protective shell of a transformer DC bias magnetic monitoring device and method proposed by the present invention;

[0036] Figure 8 A schematic diagram of the internal structure of a protective shell of a transformer DC bias magnetic monitoring device and method proposed in the present invention;

[0037] Figure 9 This is a schematic diagram of the box cover structure of a transformer DC bias magnetic monitoring device and method proposed by the present invention;

[0038] Figure 10 This is a schematic diagram of the protective shell structure of a transformer DC bias magnetic monitoring device and method proposed in the present invention;

[0039] Figure 11 This is a schematic diagram of the first spring installation structure of a transformer DC bias monitoring device and method proposed by the present invention;

[0040] Figure 12 This is a schematic diagram of the support plate installation structure of a transformer DC bias magnetic monitoring device and method proposed by the present invention.

[0041] In the figure: 1. Box body; 2. Box cover; 3. Mounting shell; 4. Protective shell; 5. Open and close type mutual inductor body; 6. Mounting slot; 7. Grounding bar; 8. Lifting plate; 9. Three-axis vibration sensor body; 10. First spring; 11. Limiting plate; 12. Temperature sensor body; 13. Mounting plate; 14. Rubber bag; 15. Second spring; 16. Slide groove; 17. Slider; 18. Placement plate; 19. Bolt; 20. Support plate; 21. Placement slot; 22. Connecting rod; 23. Connecting plate; 24. Connecting hole; 25. Mounting hole; 26. Protective net; 27. Card slot; 28. Card block; 29. Through hole; 30. Limiting ring; 31. Circuit board. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0043] Reference Figure 1-12 A transformer DC bias magnetic monitoring device and method, including an acquisition module, a monitoring module and a control module,

[0044] The acquisition module is used to acquire target parameters corresponding to the transformer and send the target parameters to the monitoring module; wherein the target parameters include: at least one of the DC component of the transformer node, the surface temperature of the transformer ground bar and its surroundings, and the vibration amplitude of the transformer ground bar;

[0045] The monitoring module is used to receive the target parameters, verify the accuracy of the target parameters according to the preset verification operation rules, and send the verification results to the control module;

[0046] The control module is used to receive and display the inspection result.

[0047] As a technical optimization solution of the present invention, the acquisition module includes a current sensing unit, a temperature sensing unit and a vibration sensing unit;

[0048] The current sensing unit is used to collect the DC component of the transformer node and send the collected DC component to the monitoring module;

[0049] The temperature sensing unit is used to collect the temperature of the ground bar surface and the surrounding area, and send the collected temperature to the monitoring module;

[0050] The vibration sensing unit is used to collect the vibration amplitude of the ground bar and send the collected vibration amplitude to the monitoring module.

[0051] As a technical optimization solution of the present invention, the verification operation rules preset by the monitoring module are:

[0052] Z is the value after target parameter verification, W is the preset balance coefficient, Y1 is the voltage value obtained by current sensing monitoring, Y2 is the temperature value obtained by temperature sensing monitoring, Y3 is the vibration frequency value obtained by vibration sensing monitoring, A is the voltage influence ratio; B is the temperature influence ratio, and C is the vibration frequency influence ratio, and A, B, and C are all preset values;

[0053] When U1 ≤ Z ≤ U2, the transformer is in a normal working state; when U1 < U2 < Z or Z < U1 < U2, the transformer is in an abnormal working state, where U1 and U2 are preset standard comparison values. When the outside wind blows the box body 1 during use, it will cause the box body 1 and the grounding bar 7 to shake. Since the top of the three-axis vibration sensor body 9 abuts against one side of the grounding bar 7 when monitoring the vibration of the grounding bar 7, when the box body 1 and the grounding bar 7 shake, it will affect the vibration monitoring of the grounding bar 7 by the three-axis vibration sensor body 9. At the same time, the position of the grounding bar 7 inside the split-type current transformer body 5 will also deviate. The temperature inside the box body 1 will not vary greatly in a short time due to the sealing between the box body 1 and the box cover 2. Therefore, when monitoring the DC bias of the transformer, the temperature sensor body 12 inside the box body 1 is the main monitoring basis, and the three-axis vibration sensor body 9 and the split-type current transformer body 5 assist the temperature sensor body 12 to monitor the DC bias of the transformer, and the monitoring results of the three-axis vibration sensor body 9 and the split-type current transformer body 5 can be used to verify the accuracy of the results of the temperature sensor body 12.

[0054] When one of the monitoring results is abnormal during use, since the monitoring result of the three-axis vibration sensor body 9 will deviate greatly when the position of the grounding bar 7 moves due to the shaking of the box body 1, and the monitoring result of the split-type current transformer body 5 will also deviate accordingly, and the monitoring values of the three-axis vibration sensor body 9 and the split-type current transformer body 5 will increase or decrease simultaneously, and the sum of the monitoring values of the three-axis vibration sensor body 9 and the split-type current transformer body 5 will be much larger or smaller than the monitoring value of the temperature sensor body 12. During use, the monitoring result of the DC bias of the transformer can be verified by the ratio of the monitoring values.

[0055] When the transformer is working normally, according to the obtained result will be between U1 and U2. On the contrary, when the transformer is abnormal during operation, according to the obtained result will not be within the range between U1 and U2. At this time, it indicates that the transformer is abnormal during use, and the abnormal data information can be transmitted through the wireless signal transmission terminal, which is convenient for the staff to repair the monitoring equipment.

[0056] As a technical optimization solution of the present invention, the monitoring device is used to install the acquisition module, and the monitoring device includes a box body 1, a box cover 2 is rotatably installed at one end of the top of the box body 1, a mounting shell 3 is installed on the top of the box cover 2, and the mounting shell 3 is connected to the interior of the box cover 2, an adjustment mechanism is installed inside the box body 1, and C-shaped mounting plates 13 are installed on the sides of the box body 1 and the box cover 2, one of the mounting plates 13 is fixed to the side of the box body 1, and the two mounting plates 13 abut each other, and the two mounting plates 13 are provided with mounting grooves 6 on opposite sides, and a monitoring mechanism is installed inside the mounting groove 6, and a placement groove 21 is provided at one end of the opposite surfaces of the box body 1 and the box cover 2, and a protective mechanism is installed inside one of the placement grooves 21, and one end of the protective mechanism is located inside the other placement groove 21.

[0057] As a technical optimization solution of the present invention, the adjustment mechanism includes a placement plate 18, a screw hole is opened on the top of the placement plate 18, and the screw hole passes through the placement plate 18 and the box body 1, and a matching bolt 19 is installed in the screw hole. A support plate 20 is fixedly installed on the bolt 19, and the support plate 20 is located at the bottom of the placement plate 18. An open-close type transformer body 5 is installed at one end of the top of the placement plate 18, and a temperature sensor body 12 is installed at the other end of the top of the placement plate 18. When in use, the staff can adjust the position of the placement plate 18 through the bolt 19, and at the same time, the position of the grounding bar 7 inside the open-close type transformer body 5 can be adjusted. The support plate 20 can better fix the position of the placement plate 18 when in use, and at the same time make the placement plate 18 more stable when in use.

[0058] As a technical optimization solution of the present invention, a grounding bar 7 is installed inside the box body 1, and the grounding bar 7 is located inside the retractable transformer body 5. The two ends of the grounding bar 7 respectively pass through the two mounting grooves 6, and the temperature sensor body 12 is located below the grounding bar 7. Slide grooves 16 are provided on the inner walls of both sides of the box body 1, and sliders 17 are slidably installed in the two slide grooves 16. The ends of the two sliders 17 away from the inner wall of the box body 1 are respectively installed on both sides of the placement plate 18. When in use, the temperature sensor body 12 can simultaneously monitor the heat emitted from the bottom of the grounding bar 7 and the temperature inside the box body 1. The high temperature inside the placement box body 1 causes damage to the grounding bar 7.

[0059] As a technical optimization solution of the present invention, the monitoring mechanism includes a U-shaped lifting plate 8, and several first springs 10 are installed at the bottom of the lifting plate 8, and the end of the first spring 10 away from the lifting plate 8 is installed at the inner bottom of the mounting groove 6, and the top ends of the lifting plate 8 are installed with a three-axis vibration sensor body 9, and the inner bottom ends of the mounting groove 6 are installed with an L-shaped limit plate 11, and the two limit plates 11 are respectively located at the two ends of the lifting plate 8, and the two ends of the grounding bar 7 are located between the top of the limit plate 11 and the lifting plate 8, and the top of the three-axis vibration sensor body 9 is abutted against the bottom of the grounding bar 7. When the lifting plate 8 is pushed by the first spring 10, the three-axis vibration sensor body 9 at the top is abutted against the bottom of the grounding bar 7. When in use, the lifting plate 8 can better fix the position of the grounding bar 7 and can monitor the vibration frequency of the grounding bar 7 in real time.

[0060] As a technical optimization solution of the present invention, the protective mechanism includes a rubber bag 14, and the rubber bag 14 is fixed at one end of the bottom of the box cover 2. The two sides of the end of the rubber bag 14 away from the box cover 2 are respectively abutted against the inner walls of the placement grooves 21 on the two mounting plates 13. Two second springs 15 are installed at the bottom of the box cover 2, and the two second springs 15 are respectively located at both ends of the rubber bag 14. The end of the second spring 15 away from the box cover 2 is abutted against the top of the box body 1. When in use, when the temperature inside the box body 1 is high, the rubber bag 14 will soften. At the same time, the rubber bag 14 is squeezed into the interior of the box body 1 by the two mounting plates 13, and the friction between the side of the rubber bag 14 and the inside of the placement groove 21 will gradually decrease with the movement of the rubber bag 14, and the second spring 15 will push one end of the box cover 2 through the elasticity of the body, so that the high-temperature gas inside the box body 1 is quickly discharged.

[0061] As a technical optimization solution of the present invention, a connecting rod 22 is installed on the top of the mounting shell 3, the bottom end of the connecting rod 22 passes through the mounting shell 3, and is installed with a connecting plate 23, the connecting plate 23 is installed on the inner top of the mounting shell 3, and a limiting ring 30 is installed on the top of the connecting rod 22. Two connecting holes 24 are opened on the top of the connecting rod 22. The connecting hole 24 passes through the connecting rod 22 and is connected to the connecting plate 23. A protective shell 4 is slidably installed on the connecting rod 22, and the mounting shell 3 is located inside the protective shell 4. The limiting ring 30 is located in the protective shell 4. When the temperature inside the box body 1 is high and causes the box cover 2 to rotate, the box cover 2 can drive the mounting shell 3 and the connecting plate 23 to move upward, and at the same time, the connecting plate 23 is electrically disconnected from the circuit board 31, and the split-type mutual inductor body 5, the three-axis vibration sensor body 9 and the temperature sensor body 12 also stop monitoring the grounding bar 7 until the staff performs maintenance on the inside of the box body 1. When in use, the monitor and the grounding bar 7 inside the box body 1 can be better protected to prevent the monitor from continuing to heat up when the temperature inside the box body 1 is high.

[0062] As a technical optimization solution of the present invention, a number of mounting holes 25 are provided on the outer wall of the mounting shell 3, and a protective net 26 is installed on the inner wall of the several mounting holes 25. A number of through holes 29 are provided on the outer wall of the protective net 26. A card slot 27 is provided on the bottom of the inner wall of the protective shell 4 between two adjacent through holes 29. A card block 28 is slidably installed inside the card slot 27. The end of the card block 28 away from the inner wall of the protective shell 4 is installed at the bottom of the outer wall of the mounting shell 3, and the card block 28 is located below the mounting hole 25. When in use, the staff can pull the protective shell 4 and rotate the protective shell 4 to adjust the sealing state and ventilation state of the mounting shell 3.

[0063] As a technical optimization solution of the present invention, a circuit board 31 is installed at the inner bottom of the box body 1, and the open-close mutual inductor body 5, the three-axis vibration sensor body 9 and the temperature sensor body 12 are all electrically connected to the connecting plate 23 through the circuit board 31. The monitoring results of the open-close mutual inductor body 5, the three-axis vibration sensor body 9 and the temperature sensor body 12 can be gathered and transmitted through the circuit board 31, which facilitates the verification of the monitoring results.

[0064] When the present invention is used, the staff installs the box body 1 in a designated position, and one section of the monitored ground bar 7 is installed inside the box body 1. After the ground bar 7 is installed, the staff installs the split-type transformer body 5 so that the ground bar 7 is located inside the split-type transformer body 5. During use, the first spring 10 pushes the lifting plate 8 upward, and the lifting plate 8 can push the ground bar 7 to move, so that the lifting plate 8 and the limit plate 11 clamp and fix the ground bar 7. The staff rotates the bolt 19, so that the bolt 19 drives the placement plate 18 to move up and down. When the placement plate 18 moves up and down, the position of the split-type transformer body 5 can be adjusted, so that the split-type transformer body 5 can better monitor the ground bar 7, making the ground bar 7 more stable during use and preventing serious shaking. The temperature sensor body 12 located on the top of the placement plate 18 can simultaneously monitor the temperature emitted from the bottom of the ground bar 7 and the temperature inside the box body 1, preventing the ground bar 7 and the monitor from being damaged during use due to excessive temperature inside the box body 1.

[0065] When in use, the open-close mutual inductor body 5, the three-axis vibration sensor body 9 and the temperature sensor body 12 are all electrically connected to the circuit board 31, and the circuit board 31 is connected to the connecting plate 23 through wires. When in use, the staff can insert the external signal receiving wire into the connecting hole 24 on the connecting rod 22 and connect it to the connecting plate 23. When in use, the staff can simultaneously receive the monitoring results of the open-close mutual inductor body 5, the three-axis vibration sensor body 9 and the temperature sensor body 12 inside the box body 1 through the connecting rod 22.

[0066] When in use, one end of the rubber bag 14 at the bottom of the box cover 2 is placed in the placement groove 21 on the top of the mounting plate 13 on the box body 1. At the same time, the staff can place the other mounting plate 13 on the side of the box cover 2, and the two mounting plates 13 can be fixed to each other by screws. At the same time, the end of the rubber bag 14 away from the box cover 2 is installed in the placement groove 21 on the opposite surface of the two mounting plates 13. The inner walls of the two placement grooves 21 can better clamp the rubber bag 14. The rubber bag 14 is fixed in position by the friction between its surface and the inner wall of the placement groove 21, and the position of the box cover 2 is also fixed.

[0067] During use, when the temperature inside the box body 1 is high, the high-temperature gas inside the box body 1 will move toward the inside of the box cover 2 and the mounting shell 3, and enter between the mounting shell 3 and the protective shell 4 through the mounting hole 25, and the high-temperature air can slowly flow between the mounting shell 3 and the protective shell 4, and then be discharged to the outside through the through hole 29. During use, the high temperature inside the box body 1 can be slowly discharged through the gap between the mounting shell 3 and the protective shell 4, which can continuously cool the inside of the box body 1. When the box body 1 is installed and used, the staff can pull the protective shell 4 to move the protective shell 4 in the direction of the limit ring 30, and at the same time, the block 28 on the mounting shell 3 moves out of the slot 27, and the staff can manually rotate the protective shell 4 and adjust the direction of the protective shell 4 to move the block 28 to the bottom of the protective shell 4, and the limit ring 30 and the block 28 can clamp the protective shell 4 in position, and at the same time, the mounting hole 25 and the through hole 29 overlap. When in use, the inside of the box body 1 can maintain circulation with the outside air through the mounting shell 3, and the protective net 26 can better block the dust from the outside.

[0068] During hot summer weather, the operation of the monitor and ground bar 7 can cause the temperature inside the housing 1 to rise sharply. When the protective shell 4 blocks the mounting hole 25, the hot air inside the housing 1 softens the rubber on the rubber bladder 14 located between the two mounting plates 13, causing the rubber bladder 14 to move toward the interior of the housing 1 under the force of the internal air. Simultaneously, as the rubber surface of the rubber bladder 14 softens, the friction between the inner walls of the two placement slots 21 and the surface of the rubber bladder 14 decreases. At this time, the two second springs 15 at the bottom of the cover 2, located at either end of the rubber bladder 14, push the cover 2 upward. As the surface of the rubber bladder 14 softens, the end of the rubber bladder 14 away from the cover 2 moves out of the placement slot 21, causing the second springs 15 to rotate the cover 2, rapidly discharging the hot air inside the housing 1 to the outside. This rapidly cools the interior of the housing 1 during use, preventing the hot air inside the housing 1 from damaging the ground bar 7 and the monitor.

[0069] When the box cover 2 rotates, the box cover 2 drives the mounting shell 3 to rotate accordingly, and the top connecting plate 23 in the mounting shell 3 moves along with the movement of the mounting shell 3, which pulls the wires between the connecting plate 23 and the circuit board 31, thereby disconnecting the wires from the connecting plate 23, and the open-close mutual inductor body 5, the three-axis vibration sensor body 9 and the temperature sensor body 12 simultaneously stop monitoring the grounding bar 7, reducing the heat generation of the monitor itself when the temperature inside the box body 1 is too high, and at the same time better protecting the grounding bar 7 and the monitor to prevent damage to the monitor when used under high temperature conditions. When the monitor stops monitoring the grounding bar 7, the monitoring module will send an alarm signal to the control module, so that the staff can promptly inspect the monitor and the grounding bar 7 inside the box body 1, and then install and fix the box cover 2. When the temperature inside the box body 1 is too high, the box cover 2 can automatically open and rotate. When the staff is inspecting the inside of the box body 1, there is no need for the staff to disassemble the box cover 2, so that the staff can repair the inside of the box body 1 as quickly as possible, which can save a lot of time during use. In addition, the rubber bag 14 can come into contact with the outside air when the box cover 2 rotates, so that the rubber bag 14 hardens again, which is convenient for the staff to reinstall the box cover 2 after inspecting the inside of the box body 1.

[0070] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A transformer DC bias magnetic monitoring device, characterized in that: The monitoring device is used to install an acquisition module, which includes an open-close mutual inductor body (5), a three-axis vibration sensor body (9) and a temperature sensor body (12), and the monitoring device includes a box body (1), a box cover (2) is rotatably installed at one end of the top of the box body (1), a mounting shell (3) is installed on the top of the box cover (2), and the mounting shell (3) is communicated with the interior of the box cover (2), an adjustment mechanism is installed inside the box body (1), and C-shaped mounting plates (13) are installed on the sides of the box body (1) and the box cover (2), one of the mounting plates (13) is fixed to the side of the box body (1), and the two mounting plates (13) are in contact with each other, and mounting grooves (6) are provided on the opposite sides of the two mounting plates (13), and a monitoring mechanism is installed inside the mounting groove (6), and a placement groove (21) is provided on one end of the opposite surface of the box body (1) and the box cover (2), a protective mechanism is installed inside one of the placement grooves (21), and one end of the protective mechanism is located inside the other placement groove (21); A grounding bar (7) is installed inside the box body (1), and the grounding bar (7) is located inside the retractable transformer body (5). Two ends of the grounding bar (7) respectively pass through two mounting grooves (6), and the temperature sensor body (12) is located below the grounding bar (7). Slide grooves (16) are provided on the inner walls of both sides of the box body (1), and sliders (17) are slidably installed in the two slide grooves (16). The ends of the two sliders (17) away from the inner wall of the box body (1) are respectively installed on the placement plate (18). On both sides; the adjustment mechanism includes a placement plate (18), a screw hole is opened on the top of the placement plate (18), and the screw hole passes through the placement plate (18) and the box body (1), a matching bolt (19) is installed in the screw hole, a support plate (20) is fixedly installed on the bolt (19), and the support plate (20) is located at the bottom of the placement plate (18), an open-close mutual inductor body (5) is installed at one end of the top of the placement plate (18), and a temperature sensor body (12) is installed at the other end of the top of the placement plate (18); The monitoring mechanism comprises a U-shaped lifting plate (8), and a plurality of first springs (10) are installed at the bottom of the lifting plate (8), and one end of the first spring (10) away from the lifting plate (8) is installed at the inner bottom of the mounting groove (6), and a three-axis vibration sensor body (9) is installed at both ends of the top of the lifting plate (8), and L-shaped limiting plates (11) are installed at both ends of the inner bottom of the mounting groove (6), and the two limiting plates (11) are respectively located at both ends of the lifting plate (8), and both ends of the grounding bar (7) are located between the top of the limiting plate (11) and the lifting plate (8), and the top of the three-axis vibration sensor body (9) is in contact with the bottom of the grounding bar (7).

2. A transformer DC bias monitoring device according to claim 1, characterized in that: The protective mechanism includes a rubber bag (14), and the rubber bag (14) is fixed to one end of the bottom of the box cover (2). Both sides of the end of the rubber bag (14) away from the box cover (2) are respectively in contact with the inner walls of the placement grooves (21) on the two mounting plates (13). Two second springs (15) are installed at the bottom of the box cover (2), and the two second springs (15) are respectively located at two ends of the rubber bag (14). The end of the second spring (15) away from the box cover (2) is in contact with the top of the box body (1).

3. A transformer DC bias monitoring device according to claim 2, characterized in that: A connecting rod (22) is installed on the top of the mounting shell (3), the bottom end of the connecting rod (22) passes through the mounting shell (3) and is installed with a connecting plate (23), the connecting plate (23) is installed on the inner top of the mounting shell (3), the top of the connecting rod (22) is installed with a limiting ring (30), the top of the connecting rod (22) is provided with two connecting holes (24), the connecting holes (24) pass through the connecting rod (22) and are connected to the connecting plate (23), a protective shell (4) is slidably installed on the connecting rod (22), and the mounting shell (3) is located inside the protective shell (4), and the limiting ring (30) is located above the protective shell (4); The outer wall of the mounting shell (3) is provided with a plurality of mounting holes (25), the inner walls of the plurality of mounting holes (25) are provided with protective nets (26), the outer wall of the protective nets (26) is provided with a plurality of through holes (29), the bottom of the inner wall of the protective shell (4) is provided with a card slot (27) between two adjacent through holes (29), a card block (28) is slidably installed inside the card slot (27), the end of the card block (28) away from the inner wall of the protective shell (4) is installed at the bottom of the outer wall of the mounting shell (3), and the card block (28) is located below the mounting hole (25).

4. A transformer DC bias monitoring device according to claim 3, characterized in that: A circuit board (31) is installed on the inner bottom of the box body (1), and the split-type mutual inductor body (5), the three-axis vibration sensor body (9) and the temperature sensor body (12) are all electrically connected to the connecting plate (23) via the circuit board (31).

5. A transformer DC bias monitoring method, characterized in that: The monitoring method is applied to the monitoring device of any one of claims 1 to 4 above, and the monitoring method further comprises an acquisition module, a monitoring module, and a control module, wherein the acquisition module is configured to acquire target parameters corresponding to the transformer and send the target parameters to the monitoring module; wherein the target parameters include at least one of a DC component of a transformer node, a surface temperature of and surrounding area of a transformer ground bar, and a vibration amplitude of the transformer ground bar; The monitoring module is used to receive the target parameter, verify the accuracy of the target parameter according to a preset verification operation rule, and send the verification result to the control module; The control module is used to receive and display the inspection result.

6. A transformer DC bias monitoring method according to claim 5, characterized in that: The acquisition module includes a current sensing unit, a temperature sensing unit and a vibration sensing unit; The current sensing unit is used to collect the DC component of the transformer node and send the collected DC component to the monitoring module; The temperature sensing unit is used to collect the temperature of the ground bar surface and the surrounding area, and send the collected temperature to the monitoring module; The vibration sensing unit is used to collect the vibration amplitude of the ground bar and send the collected vibration amplitude to the monitoring module.

7. A transformer DC bias monitoring method according to claim 6, characterized in that: The preset verification operation rules of the monitoring module are: ； The Z is the value after target parameter verification, W is the preset balance coefficient, is the voltage value obtained by current sensing monitoring, is the temperature value obtained by temperature sensing monitoring, is the vibration frequency value obtained by vibration sensing monitoring, A is the voltage influence ratio; B is the temperature influence ratio, and C is the vibration frequency influence ratio, and A, B, and C are all preset values; when When the transformer is in normal working state; when or When the transformer is in abnormal working state, and It is the preset standard comparison value.

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