Partial discharge monitoring device based on pulse current method

Abstract

The utility model provides a partial discharge monitoring device based on a pulse current method, which comprises a monitor, heat dissipation shells, a closed structure, a filter screen and a fixing structure, two sides of the monitor are respectively provided with a through groove, the outer sides of the through grooves at two sides of the monitor are respectively and fixedly connected with a group of heat dissipation shells, and the inner wall of each group of heat dissipation shells is fixedly connected with a group of mounting plates. A closed structure is arranged between the mounting plate and the inner wall of the heat dissipation shell, slots are formed in the inner top and the inner bottom of the heat dissipation shell respectively, filter screens are slidably arranged in the slots in the inner top and the inner bottom of the heat dissipation shell, and a fixing structure is arranged on one side of each filter screen. Through the arrangement of the filter screen, the fixing structure and the handle, the telescopic plate extrudes the spring while entering the mounting groove, and the limiting plate on the side surface of the telescopic plate is separated from the inner wall of the limiting groove on one side of the filter screen, so that the filter screen can be pulled to slide along the insertion grooves in the top and the bottom in the heat dissipation shell to be taken out through the access groove in one end of the heat dissipation shell; and the convenience of cleaning the filter screen is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of discharge monitoring equipment, in particular to a local discharge monitoring device based on a pulse current method. Background Art

[0002] With the development of distribution network equipment status detection technology, power companies have put forward basic requirements for distribution network equipment status detection technology such as "qualitative, phase-fixed, localized, and quantitative". Due to the complex and diverse operating environment and operating conditions of distribution network equipment, partial discharge includes insulation defect discharge, suspension discharge, corona discharge, surface discharge and other types of discharge. How to solve the operation failure of distribution equipment with low investment and high efficiency to ensure the safe and reliable operation of equipment is particularly important.

[0003] Insulation damage can lead to partial discharge, which exists between some insulation gaps. Partial discharge refers to the phenomenon that discharge occurs in some areas of the insulating medium without forming a penetrating electrical channel. This phenomenon mainly occurs in one of the main driving factors of insulation degradation and eventually insulation failure. Partial discharge test is a common method for detecting the insulation performance of electrical equipment. The three-phase high-frequency pulse current method is a partial discharge detection method. This method uses a coupled capacitor sensor to accurately capture the partial discharge signal of the power equipment and perform digital processing. Through high-speed data acquisition technology, the operating status of the power equipment can be monitored in real time. This method has high sensitivity and high precision, and can realize automated detection and data analysis. Compared with existing partial discharge detection technologies such as ultrasonic method, ground voltage method, and ultra-high frequency method, the three-phase high-frequency pulse current method has higher detection accuracy and wider application prospects; these partial discharges have little effect at the beginning, but over time they will cause greater damage to the insulation, and the intensity and frequency will increase. If these local phenomena cannot be detected in time and the cause cannot be found out, the partial discharge will inevitably develop into breakdown discharge, which will eventually lead to damage to the operating equipment. In terms of time, it takes several weeks to several months from the occurrence of partial discharge to the insulation breakdown stage. Therefore, if partial discharge can be detected by a suitable discharge detector and an early warning is given, appropriate countermeasures can be considered in advance;

[0004] Some discharge monitors have fans integrated inside to increase air flow and accelerate heat dissipation. The outer shells of these discharge monitors are prefabricated with heat dissipation vents to accelerate air circulation and increase heat dissipation efficiency. When the discharge monitor is not in use, due to the circulation of air, dust in the air will still pass through the heat dissipation vents of the discharge monitor shell and enter the discharge monitor. The dust will adhere to the outer surface of the electronic components inside the discharge monitor. If the accumulated dust is used for a long time, it will corrode the printed wires in the circuit board, the metal pins of the electronic components, etc., and in severe cases, the printed wires will be molded and broken. Usually, the moldy parts of the printed wires will occur in very fine signal wires and vias of multi-layer circuit boards. The impact of moldy breaking on the circuit board is control failure or ineffectiveness, which reduces the service life of the discharge monitor. In order to reduce the entry of dust into the discharge monitor, some discharge monitors are also equipped with filters at the heat dissipation vents of the outer shell. When too much dust adheres to the surface of the filter, it will hinder the circulation of air and the inside of the monitor, reducing the heat dissipation efficiency. The dust on the surface of the filter needs to be cleaned. However, when cleaning, the outer shell of the discharge monitor needs to be disassembled to remove the filter, which makes it inconvenient to clean the filter. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a partial discharge monitoring device based on a pulse current method.

[0006] The utility model provides a partial discharge monitoring device based on a pulse current method, comprising: a monitor, a heat sink, a closed structure, a filter and a fixed structure, wherein through grooves are respectively provided on both sides of the monitor, a group of heat sinks are respectively fixedly connected to the outer sides of the through grooves on both sides of the monitor, a group of mounting plates are fixedly connected to the inner wall of each group of heat sinks, the mounting plates are in an "L" shape, a closed structure is arranged between the mounting plates and the inner wall of the heat sink, the closed structure comprises a sealing plate, a rack and a gear, two groups of sealing plates are arranged, a group of racks are respectively arranged on the opposite sides of the two groups of sealing plates, a gear is meshed between the two groups of racks, through grooves are respectively provided on the upper surface and the lower surface of one end of the heat sink, the through grooves are mutually communicated with the inside of the heat sink, an inlet and outlet groove is provided on the outer surface of one end of the heat sink, and the top and the bottom of the heat sink are respectively provided with a sealing plate. There is a slot, which is connected to the inside of the entrance and exit slot at one end of the heat dissipation shell, and filters are slidably arranged inside the top and bottom slots in the heat dissipation shell, the filter is located on the side of the mounting plate away from the inner wall of the heat dissipation shell, and a fixed structure is arranged on one side of the filter, the fixed structure includes a sleeve, a spring, a telescopic plate and a limit plate, one side of the sleeve is fixedly connected to the inner wall of the heat dissipation shell, the upper and lower ends of the sleeve are respectively provided with mounting slots, and a group of springs are respectively arranged inside the mounting slots at the upper and lower ends of the sleeve, one end of the spring is fixedly connected to the inner walls of the mounting slots at the upper and lower ends of the sleeve, and the other end of the spring is fixedly connected to the telescopic plate, the telescopic plate extends to the outer surface of the sleeve away from one end of the spring, and the side surface of the telescopic plate is fixedly connected to the limit plate, and the two groups of telescopic plates extend to the outer surface of the heat dissipation shell through the upper and lower surface through grooves of one end of the heat dissipation shell away from one end of the spring.

[0007] Preferably, a liquid crystal display, a USB interface, an alarm indicator light, a three-phase power indicator light, a self-test button, an operation indicator light, a core phase hole and a grounding terminal hole are fixedly connected to the outer surface of the monitor.

[0008] Preferably, the outer surface of the heat dissipation shell is provided with through holes, which are connected with the inside of the heat dissipation shell; the upper surface and the lower surface of the heat dissipation shell are respectively provided with a plurality of heat dissipation grooves, which are connected with the inside of the heat dissipation shell; the top and the bottom of the heat dissipation shell are respectively provided with limiting grooves; two groups of sealing plates are respectively slidably arranged in the top and bottom limiting grooves of the heat dissipation shell; the outer surfaces of the two groups of sealing plates are provided with a plurality of ventilation grooves; the ventilation grooves on the outer surfaces of the two groups of sealing plates correspond to the heat dissipation grooves on the upper and lower surfaces of the heat dissipation shell in an alternating manner.

[0009] Preferably, two groups of slide grooves are provided on one side of the mounting plate close to the inner wall of the heat dissipation shell, a connecting plate is fixedly connected to one side of the mounting plate close to the inner wall of the heat dissipation shell, and a through hole is provided on the side surface of one end of the connecting plate.

[0010] Preferably, the two groups of racks are respectively slidably arranged inside the two groups of sliding grooves on one side of the mounting plate, the two groups of racks are respectively fixedly connected with connecting rods on the side away from the gears, and the two groups of connecting rods are respectively fixedly connected to the opposite side of the two groups of sealing plates at one end away from the racks.

[0011] Preferably, a rotating rod is fixedly connected to the middle part of the gear, one end of the rotating rod is rotatably connected to the side of the mounting plate close to the inner wall of the heat dissipation shell, the other end of the rotating rod is fixedly connected to a driven bevel gear, one side of the driven bevel gear is meshed with an active bevel gear, one end of the active bevel gear is fixedly connected to a transmission rod, the transmission rod is rotatably connected to the inside of a through hole on the side surface of one end of the connecting plate, the transmission rod is fixedly connected to a worm gear at one end away from the active bevel gear, a worm is meshed under the worm gear, one end of the worm gear is rotatably connected to the side of the mounting plate close to the inner wall of the heat dissipation shell, the end of the worm gear away from the mounting plate passes through the through hole on the outer surface of the heat dissipation shell and extends to the outer surface of the heat dissipation shell, and the end of the worm gear extending to the outer surface of the heat dissipation shell is fixedly connected to a knob.

[0012] Preferably, one end of the filter screen passes through an entrance and exit slot at one end of the heat dissipation shell and extends to the outer surface of the heat dissipation shell. Two groups of limiting slots are provided on the side of the filter screen close to the inner wall of the heat dissipation shell. The two groups of limiting plates on the side surfaces of the telescopic plates are respectively attached to the inner walls of the limiting slots on one side of the filter screen. The filter screen extends to one end of the outer surface of the heat dissipation shell and is fixedly connected with a handle.

[0013] Compared with the related art, the partial discharge monitoring device based on the pulse current method provided by the utility model has the following beneficial effects:

[0014] The worm gear is engaged with the worm gear of the control gear and the worm gear is engaged with the worm gear of the control gear, and the worm gear is engaged with the worm gear of the control gear.

[0015] By providing a filter screen, a fixing structure and a handle, the telescopic plate is pressed, and the telescopic plate slides along the through grooves on the upper surface and the lower surface of one end of the heat dissipation shell, and one end of the telescopic plate enters the installation grooves at the upper and lower ends of the sleeve. The telescopic plate squeezes the spring while entering the installation groove, and the spring contracts to generate elastic force, and the limiting plate on the side surface of the telescopic plate is separated from the inner wall of the limiting groove on one side of the filter screen. The operator holds the handle and pulls out the filter screen to slide along the top and bottom slots in the heat dissipation shell through the access slot at one end of the heat dissipation shell to take out the filter screen, which is convenient for cleaning the filter screen, and effectively improves the convenience of cleaning the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a preferred embodiment of a partial discharge monitoring device based on a pulse current method provided by the utility model;

[0017] Figure 2 It is a structural schematic diagram of another viewing angle of the utility model;

[0018] Figure 3 It is a schematic diagram of the exploded structure of the utility model;

[0019] Figure 4 For the utility model Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 5 For the utility model Figure 3 Schematic diagram of the enlarged structure at point B in the middle.

[0021] Numbers in the figure: 1. Monitor; 2. Heat dissipation shell; 3. Mounting plate; 4. Closing structure; 5. Sealing plate; 6. Rack; 7. Gear; 8. Filter; 9. Fixed structure; 10. Casing; 11. Spring; 12. Telescopic plate; 13. Limit plate; 14. LCD screen; 15. USB interface; 16. Alarm indicator light; 17. Three-phase power indicator light; 18. Self-test button; 19. Operation indicator light; 20. Nuclear phase hole; 21. Grounding terminal hole; 22. Connecting plate; 23. Connecting rod; 24. Rotating rod; 25. Driven bevel gear; 26. Active bevel gear; 27. Transmission rod; 28. Worm gear; 29. ​​Worm; 30. Knob; 31. Handle. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0023] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 ,in, Figure 1 A schematic structural diagram of a preferred embodiment of a partial discharge monitoring device based on a pulse current method provided by the utility model; Figure 2 It is a structural schematic diagram of another viewing angle of the utility model; Figure 3 It is a schematic diagram of the exploded structure of the utility model; Figure 4 For the utility model Figure 3 A schematic diagram of the enlarged structure at A in the middle; Figure 5 For the utility model Figure 3Schematic diagram of the enlarged structure at point B in the middle. The invention comprises: a monitor 1, a heat dissipation shell 2, a closed structure 4, a filter 8 and a fixed structure 9. Through grooves are respectively provided on both sides of the monitor 1. A group of heat dissipation shells 2 are respectively fixedly connected to the outer sides of the through grooves on both sides of the monitor 1. The through grooves on both sides of the monitor 1 are convenient for mutual communication with the heat dissipation shell 2. A group of mounting plates 3 are fixedly connected to the inner wall of each group of heat dissipation shells 2. The mounting plates 3 are "L"-shaped. A closed structure 4 is arranged between the mounting plates 3 and the inner wall of the heat dissipation shell 2. The closed structure 4 comprises a sealing plate 5, a rack 6 and a gear 7. Two groups of sealing plates 5 are provided. A group of racks 6 are respectively provided on the opposite sides of the two groups of sealing plates 5. A gear 7 is meshed between the two groups of racks 6. Through grooves are respectively provided on the upper surface and the lower surface of one end of the heat dissipation shell 2. The through grooves are communicated with the inside of the heat dissipation shell 2. An entry and exit groove is provided on the outer surface of one end of the heat dissipation shell 2. Slots are respectively provided on the top and the bottom of the heat dissipation shell 2. The slots are communicated with the inside of the entry and exit grooves at one end of the heat dissipation shell 2. A filter 8 is slidably arranged inside the slots at the top and the bottom of the heat dissipation shell 2. The filter 8 is located at The mounting plate 3 is away from one side of the inner wall of the heat dissipation shell 2, and a fixing structure 9 is provided on one side of the filter screen 8. The fixing structure 9 is convenient for fixing the filter screen 8 inside the heat dissipation shell 2. The fixing structure 9 includes a sleeve 10, a spring 11, a telescopic plate 12 and a limit plate 13. One side of the sleeve 10 is fixedly connected to the inner wall of the heat dissipation shell 2, and mounting grooves are respectively provided at the upper and lower ends of the sleeve 10. A group of springs 11 are respectively arranged inside the mounting grooves at the upper and lower ends of the sleeve 10. One end of the spring 11 is fixedly connected to the inner walls of the mounting grooves at the upper and lower ends of the sleeve 10, and the other end of the spring 11 is fixedly connected to the telescopic plate 12. The telescopic plate 12 extends to the outer surface of the sleeve 10 away from one end of the spring 11. The telescopic plate 12 can be telescoped inside the mounting grooves at the upper and lower ends of the sleeve 10. The side surface of the telescopic plate 12 is fixedly connected to the limit plate 13. The two groups of telescopic plates 12 are away from one end of the spring 11, respectively, through the upper and lower surface through grooves at one end of the heat dissipation shell 2 and extend to the outer surface of the heat dissipation shell 2, and the telescopic plate 12 can slide along the upper and lower surface through grooves at one end of the heat dissipation shell 2.

[0024] In the specific implementation process, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the outer surface of the monitor 1 is respectively fixedly connected with a liquid crystal display 14, a USB interface 15, an alarm indicator light 16, a three-phase live indicator light 17, a self-test button 18, an operation indicator light 19, a core phase hole 20 and a grounding terminal hole 21, and the liquid crystal display 14, the USB interface 15, the alarm indicator light 16, the three-phase live indicator light 17, the self-test button 18, the operation indicator light 19, the core phase hole 20 and the grounding terminal hole 21 are electrically connected to the internal electronic components of the monitor 1, and the liquid crystal display 14 displays the real-time discharge value of the partial discharge, including three parameters of probability intensity, average intensity and discharge frequency, and the three-phase The information is displayed in rotation, and each phase is displayed for 5S. The USB interface 15 can be debugged and calibrated on site. The alarm indicator 16 displays green when there is no partial discharge. When the on-site partial discharge exceeds the set threshold, the "alarm" light will turn to "yellow" or "red" according to the severity of the partial discharge. The red light of the three-phase live indicator 17 lights up to indicate that the corresponding phase is energized. After the self-test button 18 is pressed, the three-phase live indicators will light up at the same time. The green light of the operation indicator 19 lights up during normal operation and flashes with a period of 2S. The core phase hole 20 corresponds to the three-phase core phase interface. The grounding terminal hole 21 is used for grounding to protect the safety of users.

[0025] Among them, the outer surface of the heat dissipation shell 2 is provided with through holes, which are connected with the inside of the heat dissipation shell 2. The upper surface and the lower surface of the heat dissipation shell 2 are respectively provided with a plurality of heat dissipation grooves, which are connected with the inside of the heat dissipation shell 2. The heat dissipation grooves facilitate air circulation and heat dissipation inside the monitor 1. The top and the bottom of the heat dissipation shell 2 are respectively provided with limiting grooves. Two groups of sealing plates 5 are respectively slidably arranged inside the limiting grooves at the top and the bottom of the heat dissipation shell 2. The limiting grooves at the top and the bottom of the heat dissipation shell 2 facilitate the linear sliding of the sealing plates 5. The outer surfaces of the two groups of sealing plates 5 are provided with a plurality of ventilation grooves. The ventilation grooves on the outer surfaces of the two groups of sealing plates 5 correspond to the heat dissipation grooves on the upper and lower surfaces of the heat dissipation shell 2 in an alternating manner. The sealing plates 5 facilitate the sealing and opening of the heat dissipation grooves on the upper and lower surfaces of the heat dissipation shell 2.

[0026] Among them, two groups of sliding grooves are opened on the side of the mounting plate 3 close to the inner wall of the heat dissipation shell 2, and a connecting plate 22 is fixedly connected to the side of the mounting plate 3 close to the inner wall of the heat dissipation shell 2. A through hole is opened on the side surface of one end of the connecting plate 22, so that the mounting plate 3 is convenient for installing the closed structure 4.

[0027] Among them, two groups of racks 6 are respectively slidably arranged inside two groups of sliding grooves on one side of the mounting plate 3, and the racks 6 can slide inside the sliding grooves on one side of the mounting plate 3. The two groups of racks 6 are respectively fixedly connected with connecting rods 23 on the side away from the gear 7, and the two groups of connecting rods 23 are respectively fixedly connected to the opposite sides of the two groups of sealing plates 5 at one end away from the racks 6. When the racks 6 slide back and forth along the two groups of sliding grooves on one side of the mounting plate 3, the two groups of sealing plates 5 are pushed to slide back and forth along the top and bottom limiting grooves inside the heat dissipation shell 2 through the connecting rods 23, so as to facilitate the control of the sealing plates 5 to seal and open the heat dissipation grooves on the upper and lower surfaces of the heat dissipation shell 2.

[0028] Among them, a rotating rod 24 is fixedly connected to the middle part of the gear 7, and one end of the rotating rod 24 is rotatably connected to the side of the inner wall of the mounting plate 3 close to the heat dissipation shell 2. The rotating rod 24 facilitates the rotation of the gear 7 on the side of the mounting plate 3. The other end of the rotating rod 24 is fixedly connected to a driven bevel gear 25, and one side of the driven bevel gear 25 is meshed with an active bevel gear 26. One end of the active bevel gear 26 is fixedly connected to a transmission rod 27, and the transmission rod 27 is rotatably connected to the inside of a through hole on the side surface of one end of the connecting plate 22. The transmission rod 27 can rotate inside the through hole on the side surface of one end of the connecting plate 22. The transmission rod 27 is fixedly connected to a worm gear 28 at one end away from the active bevel gear 26, and a worm 29 is meshed below the worm gear 28. The worm gear 29 has a limiting effect on the worm gear 28 but does not hinder the worm gear 29 from rotating when driving the worm gear 28. The worm gear 29 prevents the worm gear 28 from self-rotating and resetting. One end of the worm gear 29 is rotatably connected to the mounting plate 3 Close to one side of the inner wall of the heat dissipation shell 2, one end of the worm 29 away from the mounting plate 3 passes through the through hole on the outer surface of the heat dissipation shell 2 and extends to the outer surface of the heat dissipation shell 2. The worm 29 can rotate inside the through hole on the outer surface of the heat dissipation shell 2. One end of the worm 29 extending to the outer surface of the heat dissipation shell 2 is fixedly connected with a knob 30. The knob 30 is convenient for the operator to rotate. When the knob 30 is rotated, the worm 29 is driven to rotate in the through hole on the outer surface of the heat dissipation shell 2 and one side of the mounting plate 3. When the worm 29 rotates, it engages with the worm wheel 28 to rotate. When the worm wheel 28 rotates, it drives the transmission rod 27 to rotate inside the through hole on the side surface of one end of the connecting plate 22. When the transmission rod 27 rotates, it drives the active bevel gear 26 to rotate. When the active bevel gear 26 rotates, it engages with the driven bevel gear 25 to rotate. When the driven bevel gear 25 rotates, it drives the rotating rod 24 to rotate on one side of the mounting plate 3. When the rotating rod 24 rotates, it drives the gear 7 to rotate.

[0029] Among them, one end of the filter screen 8 passes through the entrance and exit groove at one end of the heat dissipation shell 2 and extends to the outer surface of the heat dissipation shell 2. Two groups of limiting grooves are opened on the side of the filter screen 8 close to the inner wall of the heat dissipation shell 2. The limiting plates 13 on the side surfaces of the two groups of telescopic plates 12 are respectively attached to the inner walls of the limiting grooves on one side of the filter screen 8. Under the elastic force of the spring 11, the telescopic plate 12 pushes the limiting plate 13 to fit tightly to the inner wall of the limiting groove on one side of the filter screen 8, so that the filter screen 8 is fixed inside the heat dissipation shell 2. The filter screen 8 extends to one end of the outer surface of the heat dissipation shell 2 and is fixedly connected with a handle 31. The handle 31 is convenient for the operator to hold and pull out the filter screen 8.

[0030] The working principle provided by the utility model is as follows: when the monitor 1 is not in use, in order to prevent dust from entering the monitor 1, the operator rotates the knob 30, and when the knob 30 rotates, the worm 29 is driven to rotate in the through hole on the outer surface of the heat dissipation shell 2 and the side of the mounting plate 3, and when the worm 29 rotates, the worm gear 28 is engaged to rotate, and when the worm gear 28 rotates, the transmission rod 27 is driven to rotate inside the through hole on the side surface of one end of the connecting plate 22, and when the transmission rod 27 rotates, the active bevel gear 26 is driven to rotate, and when the active bevel gear 26 rotates, it is engaged to rotate the driven bevel gear 25, and when the driven bevel gear 25 rotates, it drives the rotating rod 24 to rotate on one side of the mounting plate 3, and the rotating rod 24 When the gear 7 rotates, it drives the gear 7 to rotate. When the gear 7 rotates, it meshes with the two sets of racks 6, so that the two sets of racks 6 slide along the two sets of slide grooves on one side of the mounting plate 3. When the racks 6 slide along the two sets of slide grooves on one side of the mounting plate 3, the two sets of sealing plates 5 are pushed to slide along the top and bottom limit grooves inside the heat dissipation shell 2 through the connecting rod 23, so that the sealing plates 5 seal the heat dissipation grooves on the upper and lower surfaces of the heat dissipation shell 2. The operator can stop rotating the knob 30. When the monitor 1 is in use, the operator reverses the knob 30, so that the sealing plate 5 slides oppositely along the top and bottom limit grooves inside the heat dissipation shell 2, so that the ventilation grooves on the outer surface of the sealing plate 5 and the upper surface of the heat dissipation shell 2 are connected. Corresponding to the heat dissipation groove on the lower surface, it is convenient for air circulation and heat dissipation inside the monitor 1. During heat dissipation, part of the dust in the air will enter the heat dissipation shell 2 and adhere to the surface of the filter 8. When there is too much dust on the surface of the filter 8, it will hinder the circulation of air and the inside of the monitor 1, reducing the heat dissipation efficiency. At this time, the operator presses the telescopic plate 12, and the telescopic plate 12 slides along the upper and lower surface grooves at one end of the heat dissipation shell 2, and makes one end of the telescopic plate 12 enter the installation grooves at the upper and lower ends of the sleeve 10. When the telescopic plate 12 enters the installation groove, it squeezes the spring 11, and the spring 11 contracts to generate elastic force, and the side surface of the telescopic plate 12 is limited The plate 13 is separated from the inner wall of the limiting groove on one side of the filter 8. The operator holds the handle 31 to pull out the filter 8 and slide it along the top and bottom slots in the heat dissipation shell 2 through the entrance and exit slot at one end of the heat dissipation shell 2 to take out the filter 8, which is convenient for cleaning the filter 8. After cleaning, press the telescopic plate 12 and repeat the above steps to slide the filter 8 through the entrance and exit slot at one end of the heat dissipation shell 2 along the top and bottom slots in the heat dissipation shell 2 to reset it, and release the telescopic plate 12 at the same time. The telescopic plate 12 returns to its original position under the elastic force of the spring 11, and at the same time pushes the limiting plate 13 to fit tightly against the inner wall of the limiting groove on one side of the filter 8 to complete the fixation of the filter 8.

[0031] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0032] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A partial discharge monitoring device based on a pulse current method, comprising: A monitor (1), a heat dissipation shell (2), a closed structure (4), a filter (8) and a fixed structure (9), characterized in that through grooves are respectively provided on both sides of the monitor (1), a group of heat dissipation shells (2) are respectively fixedly connected to the outer sides of the through grooves on both sides of the monitor (1), a group of mounting plates (3) are fixedly connected to the inner wall of each group of heat dissipation shells (2), the mounting plates (3) are "L" shaped, a closed structure (4) is provided between the mounting plates (3) and the inner wall of the heat dissipation shell (2), and the closed structure (4) includes a sealing plate (5) , a rack (6) and a gear (7), two groups of sealing plates (5) are provided, one group of racks (6) is provided on opposite sides of the two groups of sealing plates (5), a gear (7) is meshed between the two groups of racks (6), a through groove is respectively provided on the upper surface and the lower surface of one end of the heat dissipation shell (2), the through groove is communicated with the inside of the heat dissipation shell (2), an entry and exit groove is provided on the outer surface of one end of the heat dissipation shell (2), a slot is respectively provided on the top and the bottom of the heat dissipation shell (2), the slot is communicated with the inside of the entry and exit groove at one end of the heat dissipation shell (2), and the heat dissipation shell (2) is provided. (2) A filter screen (8) is slidably arranged inside the inner top and inner bottom slots, the filter screen (8) is located on the side of the mounting plate (3) away from the inner wall of the heat dissipation shell (2), a fixing structure (9) is arranged on one side of the filter screen (8), the fixing structure (9) comprises a sleeve (10), a spring (11), a telescopic plate (12) and a limit plate (13), one side of the sleeve (10) is fixedly connected to the inner wall of the heat dissipation shell (2), the upper and lower ends of the sleeve (10) are respectively provided with mounting grooves, and the parts in the mounting grooves at the upper and lower ends of the sleeve (10) are A group of springs (11) is separately provided, one end of the spring (11) is fixedly connected to the inner wall of the mounting grooves at the upper and lower ends of the sleeve (10), the other end of the spring (11) is fixedly connected to a telescopic plate (12), the telescopic plate (12) is away from one end of the spring (11) and extends to the outer surface of the sleeve (10), the side surface of the telescopic plate (12) is fixedly connected to a limiting plate (13), and the ends of the two groups of telescopic plates (12) away from the spring (11) respectively pass through the through grooves on the upper surface and the lower surface of one end of the heat dissipation shell (2) and extend to the outer surface of the heat dissipation shell (2).

2. The partial discharge monitoring device based on the pulse current method according to claim 1 is characterized in that: The outer surface of the monitor (1) is respectively fixedly connected with a liquid crystal display screen (14), a USB interface (15), an alarm indicator light (16), a three-phase power indicator light (17), a self-test button (18), an operation indicator light (19), a phase hole (20) and a grounding terminal hole (21).

3. The partial discharge monitoring device based on the pulse current method according to claim 1, characterized in that: The heat dissipation shell (2) is provided with a through hole on its outer surface, the through hole is interconnected with the interior of the heat dissipation shell (2), the upper surface and the lower surface of the heat dissipation shell (2) are respectively provided with a plurality of heat dissipation grooves, the heat dissipation grooves are interconnected with the interior of the heat dissipation shell (2), the top and the bottom of the heat dissipation shell (2) are respectively provided with a limit groove, the two groups of sealing plates (5) are respectively slidably arranged inside the limit grooves at the top and the bottom of the heat dissipation shell (2), the outer surfaces of the two groups of sealing plates (5) are provided with a plurality of ventilation grooves, and the ventilation grooves on the outer surfaces of the two groups of sealing plates (5) correspond to the heat dissipation grooves on the upper and lower surfaces of the heat dissipation shell (2) in an alternating manner.

4. The partial discharge monitoring device based on the pulse current method according to claim 1, characterized in that: The mounting plate (3) is provided with two groups of slide grooves on one side close to the inner wall of the heat dissipation shell (2), and a connecting plate (22) is fixedly connected to the mounting plate (3) on one side close to the inner wall of the heat dissipation shell (2), and a through hole is provided on the side surface of one end of the connecting plate (22).

5. The partial discharge monitoring device based on the pulse current method according to claim 1, characterized in that: The two groups of racks (6) are respectively slidably arranged inside two groups of sliding grooves on one side of the mounting plate (3); the two groups of racks (6) are respectively fixedly connected to the side away from the gear (7) with a connecting rod (23); and the two groups of connecting rods (23) are respectively fixedly connected to the opposite side of the two groups of sealing plates (5) at one end away from the racks (6).

6. The partial discharge monitoring device based on the pulse current method according to claim 1, characterized in that: A rotating rod (24) is fixedly connected to the middle of the gear (7), one end of the rotating rod (24) is rotatably connected to a side of the mounting plate (3) close to the inner wall of the heat dissipation shell (2), the other end of the rotating rod (24) is fixedly connected to a driven bevel gear (25), one side of the driven bevel gear (25) is meshed with an active bevel gear (26), one end of the active bevel gear (26) is fixedly connected to a transmission rod (27), and the transmission rod (27) is rotatably connected to the inside of a through hole on the side surface of one end of the connecting plate (22). The transmission rod (27) is fixedly connected to one end of the driving bevel gear (26) with a worm wheel (28), a worm (29) is meshed below the worm wheel (28), one end of the worm (29) is rotatably connected to a side of the mounting plate (3) close to the inner wall of the heat dissipation shell (2), one end of the worm (29) is far from the mounting plate (3) and extends through a through hole on the outer surface of the heat dissipation shell (2) to the outer surface of the heat dissipation shell (2), and one end of the worm (29) extending to the outer surface of the heat dissipation shell (2) is fixedly connected to a knob (30).

7. The partial discharge monitoring device based on the pulse current method according to claim 1, characterized in that: One end of the filter screen (8) passes through an inlet and outlet slot at one end of the heat dissipation shell (2) and extends to the outer surface of the heat dissipation shell (2). Two groups of limit slots are provided on one side of the filter screen (8) close to the inner wall of the heat dissipation shell (2). The limit plates (13) on the side surfaces of the two groups of telescopic plates (12) are respectively attached to the inner walls of the limit slots on one side of the filter screen (8). One end of the filter screen (8) extending to the outer surface of the heat dissipation shell (2) is fixedly connected to a handle (31).

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