Compact ring main unit based on particle control technology

Abstract

The invention relates to the technical field of power distribution, in particular to a compact ring main unit based on a particle control technology. Comprising a cabinet body, a gas box, a plurality of sealing partition plates, a power distribution module and a temperature sensor, the cabinet body is fixedly connected with the gas box, the plurality of sealing partition plates and the power distribution module are detachably connected with the cabinet body and the gas box respectively, the power distribution module is located in the gas box, the temperature sensor is fixedly connected in the gas box, and a pressure reduction assembly is arranged in the cabinet body; the pressure reduction assembly comprises an air pump, a cooling part, a four-way connector, a first air conveying pipe, a second air conveying pipe and an air conveying shell, the second air conveying pipe is fixedly connected and communicated with the air conveying shell, and the second air conveying pipe is communicated with the interior of the air box. When the temperature of the gas tank abnormally rises, part of gas is stored through the gas supply shell, so that the amount of gas entering the second gas conveying pipe is reduced, the pressure in the gas tank is reduced to be below a safety threshold value, and the overpressure risk in the gas tank is relieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution, and particularly to a compact ring main unit based on particle control technology. Background Art

[0002] A ring main unit is an electrical device that encapsulates electrical components such as load switches, fuses, and circuit breakers in a fully sealed metal or non-metal insulated cabinet body, realizes insulation and arc extinguishing functions by filling inert gas, and adopts an interval assembly structure to flexibly expand into a ring network power supply unit. Its core functions include power distribution, circuit control and switching, and fault protection. However, when the temperature inside the cabinet rises abnormally due to electrical faults (such as local overheating caused by poor contact of contacts, partial discharge caused by aging of insulating parts, and short-circuit current impact exceeding the arc extinguishing ability), the gas in the sealed space expands due to heat, resulting in a sharp increase in internal pressure. Although the existing system can control the temperature rise by pumping air for cooling (importing the gas into a cooling device for treatment), if abnormal situations such as overload conditions exceeding the cooling capacity occur, the pumping air for cooling will not be able to achieve sufficient cooling. At this time, the temperature inside the cabinet continues to rise. After the pressure exceeds the safety threshold, the following problems will directly occur: The sealing gasket ruptures, causing gas leakage; the conductive contact softens and deforms, resulting in failure of closing and opening; the epoxy resin insulating part carbonizes, causing a short circuit; the sensor overheats and fails, etc. Eventually, the fuse loses its protection function, the load switch cannot switch states, and even forces the entire ring network unit to withdraw from operation, resulting in power supply interruption and potential safety hazards. Summary of the Invention

[0003] To solve the problems mentioned in the above background, the present invention provides a compact ring main unit based on particle control technology.

[0004] The technical solution of the present invention is as follows: A compact ring main unit based on particle control technology, comprising a cabinet body, an air box, a plurality of partition boards, a power distribution module, and a temperature sensor. The cabinet body and the air box are fixedly connected. The plurality of partition boards and the power distribution module are respectively detachably connected to the cabinet body and the air box. The power distribution module is located inside the air box, and the temperature sensor is fixedly connected inside the air box. It is characterized in that a pressure reducing component for reducing the pressure inside the air box is provided inside the cabinet body; The pressure reducing component includes an air pump, a cooling member, a four-way joint, a first air pipe, a second air pipe, and a gas delivery shell. The air pump and the cooling member are communicated and are both fixedly connected inside the cabinet body. The four-way joint is communicated with the air inlet of the air pump. The first air pipe is fixedly connected and communicated with the four-way joint. The cooling member is fixedly connected and communicated with the gas delivery shell. The second air pipe is fixedly connected and communicated with the gas delivery shell. Both the first air pipe and the second air pipe are communicated with the inside of the air box. An adjusting component for adjusting the gas flow mode inside the gas delivery shell is provided inside the cabinet body.

[0005] Further, the adjusting component includes a plugging member, a gas pushing member, and an electric push rod. The plugging member is in limit-sealed sliding connection with the air supply housing, and a compression spring is arranged between the two. The gas pushing member is hermetically slidable within the air supply housing. The electric push rod is fixedly connected within the cabinet, and the telescopic end of the electric push rod is fixedly connected to the gas pushing member. There is a gap between the gas pushing member and the plugging member.

[0006] Further, the gas pushing member is fixedly connected with a third gas pipeline. The third gas pipeline communicates with the gap between the gas pushing member and the plugging member. The third gas pipeline is fixedly connected and communicated with the four-way joint, and a pressure relief valve is arranged within the third gas pipeline.

[0007] Further, the power distribution module includes a side expansion bus coupler, a fixing plate, a fixing shell, isolating contacts, a support frame, a rotating rod, a three-position isolating earthing switch, a support plate, earthing contacts, solid-sealed pole columns, a connecting plate, and an outgoing line head. The side expansion bus coupler, the fixing plate, the support frame, the solid-sealed pole columns, and the connecting plate are all fixedly connected within the gas tank, and the above parts are arranged in order from top to bottom. The fixing shell is fixedly connected to the fixing plate. The isolating contacts are fixedly connected within the fixing shell. The support frame is rotatably connected to the rotating rod, and the rotating rod is fixedly connected to the three-position isolating earthing switch. The outgoing line head is fixedly connected to the connecting plate.

[0008] Further, the fixing shell is fixedly connected with a first collection shell, which is used for collecting metal particles around the isolating contacts.

[0009] Further, a fixing frame is fixedly connected within the first collection shell. The fixing frame is slidably connected with an extrusion plate, and a spring is arranged between the two. A contraction member is fixedly connected between the fixing frame and the extrusion plate.

[0010] Further, the support plate is fixedly connected with a second collection shell for collecting metal particles around the earthing contacts.

[0011] Further, the support frame is fixedly connected with a third collection shell for covering the side of the solid-sealed pole column close to the support plate. The third collection shell and the sealing partition plate on the gas tank cooperate to form a closed box structure.

[0012] Further, a fourth collection shell for collecting metal particles inside it is fixedly connected to the bottom within the gas tank. The cross-section of the fourth collection shell is trapezoidal. A plurality of grid holes are arranged on the upper side of the fourth collection shell, and guiding members are fixedly connected within the grid holes of the fourth collection shell.

[0013] Further, the cross-sectional area of the upper part of the guiding member is larger than that of the lower part.

[0014] The beneficial effects of the present invention are as follows: When the temperature of the gas box rises abnormally, part of the gas flowing through the air supply shell is stored, thereby reducing the amount of gas entering the second gas transmission pipe, lowering the pressure in the gas box below the safety threshold. At the same time, through the gas circulation method, the high-temperature gas extracted from the gas box is cooled and then reinjected into the gas box, which not only avoids insulation failure caused by excessive reduction of the total gas volume but also alleviates the risk of gas box overpressure. When the temperature in the gas box returns to normal, the gas collected by the air supply shell is cooled again and sent into the gas box, enabling the cooled gas to flow back to supplement the gas volume lost due to gas extraction, maintaining the pressure stability in the gas box, and preventing insulation failure of the gas box due to insufficient gas. The present invention controls metal particles by collecting the metal particles around the above-mentioned parts and restricting their movement states by arranging particle traps at the bottom inside the gas box, around the isolating contacts, around the grounding contacts, and around the solid-sealed pole columns. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structure schematic diagram of the present invention; Figure 2 is a schematic diagram of another perspective of the three-dimensional structure of the present invention; Figure 3 is a schematic diagram of the internal structure of the cabinet body and the gas box of the present invention; Figure 4 is a schematic diagram of the internal structure of the gas box of the present invention; Figure 5 is a three-dimensional structure schematic diagram of the distribution of parts inside the gas box of the present invention; Figure 6 is a three-dimensional structure schematic diagram of the distribution of parts inside the cabinet body of the present invention; Figure 7 is a three-dimensional structure schematic diagram of the pressure reduction component of the present invention; Figure 8 is a three-dimensional structure schematic diagram of the power distribution module of the present invention; Figure 9 is a three-dimensional structure schematic diagram of the positional relationship between the three-position isolating grounding switch and the solid-sealed pole column of the present invention; Figure 10 is a sectional view of the three-dimensional structure of the fixed shell of the present invention; Figure 11 is a schematic diagram of the internal structure of the first collection shell of the present invention; Figure 12 is a three-dimensional structure schematic diagram of the fixed frame and the contraction member of the present invention; Figure 13 is a three-dimensional structure schematic diagram of the positional relationship between the grounding contact and the second collection shell of the present invention; Figure 14 is an exploded view of the three-dimensional structure of the fourth collection shell and the guiding member of the present invention.

[0016] Attached drawing reference numerals: 1 - cabinet body, 2 - gas box, 3 - side expansion bus coupler, 4 - fixing plate, 5 - fixing shell, 501 - first collection shell, 502 - fixing frame, 503 - contraction part, 504 - extrusion plate, 6 - isolating contact, 7 - support frame, 8 - rotating rod, 9 - three - position isolating earthing switch, 10 - support plate, 11 - earthing contact, 1101 - second collection shell, 12 - solid - enclosed pole, 13 - connecting plate, 14 - outgoing line head, 15 - third collection shell, 16 - fourth collection shell, 17 - guiding part, 20 - air pump, 201 - cooling part, 21 - four - way joint, 22 - first gas pipeline, 23 - second gas pipeline, 24 - air - supply shell, 25 - plugging part, 26 - air - pushing part, 27 - electric push rod, 28 - third gas pipeline. Detailed implementation mode

[0017] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and explanations of this invention are used to explain the present invention, but do not limit the present invention.

[0018] When an electrical fault occurs in a ring - main unit, the internal temperature rises abnormally, causing the inert gas to expand due to heat and the pressure to increase suddenly. If the existing air - extraction and cooling system fails to dissipate heat in time due to overload, control failure or pipeline leakage, the following chain problems will occur: 1. Seal failure: When the pressure exceeds the safety threshold, the cabinet body gasket or weld breaks, resulting in the leakage of insulating gas; 2. Component damage: The conductive contact softens and deforms, making it impossible to switch on and off. The epoxy resin insulating component carbonizes, causing a short - circuit, and the sensor overheats and malfunctions; 3. Function loss: The fuse loses its protective function, the load switch cannot switch the circuit, and finally the entire cabinet exits operation, leading to power supply interruption or safety accidents. To solve the above problems, the present invention proposes a method of reducing the pressure inside the ring - main unit by the method of "more out and less in" (i.e., the air - extraction volume > the air - intake volume) when the abnormal temperature inside the ring - main unit rises, and collecting part of the gas at the same time to maintain the insulation performance.

[0019] Embodiment 1 This embodiment discloses a compact ring - main unit based on particle control technology, as Figures 1-7As shown in the figure, it includes a cabinet body 1, an air box 2, several sealing partitions, a power distribution module, and a temperature sensor. The cabinet body 1 and the air box 2 are fixedly connected. The several sealing partitions and the power distribution module are respectively detachably connected to the cabinet body 1 and the air box 2. The power distribution module is located inside the air box 2. The temperature sensor is fixedly connected inside the air box 2. A control panel is provided on the cabinet body 1, and all electrical components in the present invention are electrically connected to the control panel. The gas inside the air box 2 is dry air or nitrogen. The temperature sensor is located in the middle of the air box 2 and is used to monitor the temperature inside the air box 2. A pressure sensor for monitoring the pressure inside it can be installed inside the air box 2. The widths of the cabinet body 1 and the air box 2 are 350 mm. The widths of the cabinet body 1 and the air box 2 in the present invention are thinner than those of the existing ring main unit, which is used to reduce the floor space. A decompression component for reducing the pressure inside the air box 2 is provided inside the cabinet body 1; the decompression component includes an air pump 20, a cooling component 201, a four-way joint 21, a first air pipe 22, a second air pipe 23, and an air supply shell 24. The air pump 20 and the cooling component 201 are connected and are both fixedly connected inside the cabinet body 1. The four-way joint 21 is connected to the air inlet of the air pump 20. The first air pipe 22 is fixedly connected and communicated with the four-way joint 21. The cooling component 201 is fixedly connected and communicated with the air supply shell 24. The air supply shell 24 is composed of two cylindrical shells with different inner diameters and a frustum-shaped shell connecting the two. The cylindrical shell with a smaller diameter is located above the cylindrical shell with a larger diameter. The second air pipe 23 is fixedly connected and communicated with the air supply shell 24. The first air pipe 22 and the second air pipe 23 are both communicated with the inside of the air box 2. Through the cooperation of the air pump 20 and the cooling component 201 (the cooling component 201 can be a radiator), the circulating cooling inside the air box 2 is realized. Check valves can be installed inside the first air pipe 22 and the second air pipe 23, which are used to make the gas inside the air box 2 can only enter the first air pipe 22, and the gas inside the second air pipe 23 can only enter the air box 2. An existing air supply device can be connected to the lower side of the four-way joint 21 to supply dry air or nitrogen to the air box 2. Two gas distribution boxes are provided inside the air box 2, and the two gas distribution boxes are respectively located at the connection positions of the first air pipe 22 and the second air pipe 23 with the air box 2. An adjusting component for adjusting the gas flow mode inside the air supply shell 24 is provided inside the cabinet body 1.

[0020] As Figure 3 , Figure 4 , Figure 6 and Figure 7As shown in the figure, the adjusting assembly includes a plugging member 25, a gas pushing member 26, and an electric push rod 27. The plugging member 25 is in limit-sealed sliding connection with the air supply housing 24, and a compression spring is provided between the two. Both the upper and lower parts of the plugging member 25 are sealed with the air supply housing 24. When the plugging member 25 slides downward, the lower part of the plugging member 25 is no longer sealed with the air supply housing 24. Under normal working conditions, the plugging member 25 is located at the extreme position in the upper part of the air supply housing 24. The gas pushing member 26 slides in a sealed manner within the air supply housing 24. The electric push rod 27 is fixedly connected within the cabinet 1, and the telescopic end of the electric push rod 27 is fixedly connected to the gas pushing member 26. There is a gap between the gas pushing member 26 and the plugging member 25. When the temperature in the air box 2 rises abnormally, the gas pushing member 26 moves downward to increase the distance between it and the plugging member 25. When the lower part of the plugging member 25 no longer contacts the air supply housing 24, gas enters the gap between the gas pushing member 26 and the plugging member 25, and another part of the gas enters the second gas transmission pipe 23, causing the air extraction volume of the first gas transmission pipe 22 to be less than the air intake volume of the second gas transmission pipe 23 for supplying gas to the air box 2, achieving the reduction of the pressure in the air box 2 while collecting the excess gas; the gas pushing member 26 is fixedly connected with a third gas transmission pipe 28. The third gas transmission pipe 28 is communicated with the gap between the gas pushing member 26 and the plugging member 25. The third gas transmission pipe 28 is fixedly connected and communicated with the four-way joint 21. The third gas transmission pipe 28 is used to send the gas between the gas pushing member 26 and the plugging member 25 into the four-way joint 21, enabling the stored excess gas to be cooled again by the cooling member 201 on the right side of the air pump 20. A pressure relief valve is provided within the third gas transmission pipe 28.

[0021] The above settings can achieve: when it is necessary to cool the air box 2, the user starts the air pump 20 and the cooling member 201 through the control panel. The air pump 20 extracts the gas in the air box 2 through the four-way joint 21 and the first gas transmission pipe 22, making the gas enter the cooling member 201 from the air outlet of the air pump 20, and after being cooled by the cooling member 201, it is transported into the air supply housing 24. The air supply housing 24 sends the cooled gas into the second gas transmission pipe 23, and the second gas transmission pipe 23 sends the cooled gas back into the air box 2 to achieve the circulating cooling within the air box 2.

[0022] During the process of cooling the inside of the air box 2, the temperature sensor inside the air box 2 monitors the temperature inside it. When the temperature inside the air box 2 rises abnormally, the temperature sensor inside the air box 2 detects this situation and transmits an electrical signal to the control panel. The control panel then transmits the electrical signal to the electric push rod 27, and the electric push rod 27 pulls the air pushing member 26 downward. During the downward movement of the air pushing member 26, the upper side inside the air supply shell 24 is in a negative pressure environment. Under the action of the negative pressure environment, the blocking member 25 is driven to move downward synchronously (the compression spring is pressed during the movement of the blocking member 25), so that the blocking member 25 releases the blockage of the upper side inside the air supply shell 24. Thus, under the action of the downward movement of the air pushing member 26, part of the gas entering the upper side inside the air supply shell 24 then enters the gap between the air pushing member 26 and the blocking member 25, thereby reducing the amount of gas entering the second gas transmission pipe 23. Finally, the second gas transmission pipe 23 sends less gas into the air box 2 than the extraction amount of the first gas transmission pipe 22, achieving the effect of "the extraction amount is greater than the intake amount".

[0023] During the process of changing the intake amount inside the air box 2, part of the gas is stored in the gap between the air pushing member 26 and the blocking member 25 by the air supply shell 24. When the temperature sensor inside the air box 2 detects that the temperature inside it has returned to normal, the control panel transmits an electrical signal to the electric push rod 27, and the electric push rod 27 controls its telescopic part to drive the air pushing member 26 to move upward. During the upward movement of the air pushing member 26, the pressure between it and the blocking member 25 is increased, so that the blocking member 25 is preferentially reset and blocks the upper side inside the air supply shell 24, making the upper and lower sides inside the air supply shell 24 no longer communicate with each other.

[0024] After the blocking member 25 is reset, the air pushing member 26 continues to move upward and continues to squeeze the gas between it and the blocking member 25. When the gas exceeds the threshold of the pressure relief valve inside the air pushing member 26, the gas breaks through the restriction of the pressure relief valve inside the air pushing member 26 and thus enters the third gas transmission pipe 28. It is transported by the third gas transmission pipe 28 to the four-way joint 21, and then re-enters the air pump 20 and the cooling member 201, so that the gas is cooled by the cooling member 201 again. Subsequently, it enters the air box 2 through the upper side inside the air supply shell 24 and the second gas transmission pipe 23 to keep the pressure inside the air box 2 stable.

[0025] After the electric push rod 27 drives the air pushing member 26 to reset, the electric push rod 27 stops working. At this time, the pressure relief valve inside the air pushing member 26 is in a closed state.

[0026] With the use of the ring main unit, there will inevitably be uncontrollable factors such as mutual friction between internal parts of the gas tank, resulting in collisions, equipment vibrations, and thermal expansion and contraction friction. These problems will inevitably generate metal particle pollutants. The metal particles float in the gas or adhere to the outer surface of the conductor, the inner surface of the gas tank, etc., and are likely to form protruding small discharge tips on the electrode surface, leading to uneven electric fields. Secondly, under the action of the electric field force, the metal particles will move, pile up together to form discharge tips, or line up to shorten the distance between the poles, ultimately resulting in a serious decline in the withstand voltage of the gas insulation system. A more serious phenomenon is that the metal particles will jump or fly under the action of the alternating electric field force. When the metal particles fall near the insulator or adhere to the surface of the insulator, the surface flashover voltage of the insulator will be significantly reduced, causing flashover on the surface of the insulator and reducing the insulation level of the ring main unit. To solve the above problems, the present invention adopts the method of setting a particle catcher to collect the metal particles and restrict the movement state of the metal particles.

[0027] Embodiment 2 A compact ring main unit based on particle control technology disclosed in this embodiment is further improved on the basis of Embodiment 1.

[0028] As Figures 3-6 、 Figure 8 and Figure 9 shown, the power distribution module includes a side-expanded bus coupler 3, a fixing plate 4, a fixing shell 5, an isolating contact 6, a support frame 7, a rotating rod 8, a three-position isolating earthing switch 9, a support plate 10, an earthing contact 11, a solid-sealed pole column 12, a connecting plate 13 and an outgoing line terminal 14. The side-expanded bus coupler 3, the fixing plate 4, the support frame 7, the solid-sealed pole column 12 and the connecting plate 13 are all fixedly connected inside the gas tank 2, and the above-mentioned parts are arranged in the order from top to bottom. The fixing shell 5 is fixedly connected to the fixing plate 4. The isolating contact 6 is fixedly connected inside the fixing shell 5. The support frame 7 is rotatably connected to the rotating rod 8. The rotating rod 8 is fixedly connected to the three-position isolating earthing switch 9. The outgoing line terminal 14 is fixedly connected to the connecting plate 13. In the drawings, the expanded bus coupler 3, the fixing shell 5, the isolating contact 6, the three-position isolating earthing switch 9, the earthing contact 11, the solid-sealed pole column 12 and the outgoing line terminal 14 are all three (only for illustrative purposes), and their installation positions are from top to bottom inside the gas tank 2.

[0029] As Figures 8-14As shown, a first collection shell 501 is fixedly connected to the fixed shell 5. The first collection shell 501 is used to collect metal particles around the isolating contact 6. The first collection shell 501 is a particle catcher at the isolating contact 6. A fixing frame 502 is fixedly connected inside the first collection shell 501. The fixing frame 502 is slidably connected with a pressing plate 504 and a spring is arranged between them. A shrinking member 503 is fixedly connected between the fixing frame 502 and the pressing plate 504. The shrinking member 503 is a fireproof and flame-retardant cloth. The shrinking member 503 is used to make metal particles adhere to it. The shape of the fixing frame 502 projected on the horizontal plane is U-shaped. The first collection shell 501, the fixing frame 502 and the pressing plate 504 are all made of metal. A second collection shell 1101 for collecting metal particles around the grounding contact 11 is fixedly connected to the support plate 10. The second collection shell 1101 is a particle catcher at the isolating contact 6. Both the first collection shell 501 and the second collection shell 1101 are thin-walled metal structures. The shape of the first collection shell 501 projected on the horizontal plane is an isosceles trapezoid. The second collection shell 1101 is an isosceles trapezoid when viewed from front to back. The included angle formed by the extended lines of the two waists of the isosceles trapezoid of the first collection shell 501 is greater than 4°. The included angle formed by the extended lines of the two waists of the isosceles trapezoid of the second collection shell 1101 is greater than 4°. The side walls at the front part inside the first collection shell 501 and the side walls at the upper part inside the second collection shell 1101 are both provided with brim structures, so that both the first collection shell 501 and the second collection shell 1101 have the characteristics of a trap, making it easy for metal particles to enter and difficult to escape. An arc surface is arranged at the bottom inside the first collection shell 501 for collecting metal particles. The included angle between the rear side and the lower side of the second collection shell 1101 is less than 88° for collecting metal particles. A third collection shell 15 for covering the side of the solid-sealed pole column 12 close to the support plate 10 is fixedly connected to the support frame 7. The third collection shell 15 and the sealing partition plate on the air box 2 cooperate to form a closed box structure. The third collection shell 15 is a particle catcher at the solid-sealed pole column 12, used to shield the front side of the solid-sealed pole column 12. A fourth collection shell 16 for collecting metal particles inside it is fixedly connected to the bottom inside the air box 2. The fourth collection shell 16 and the sealing partition plate on the air box 2 cooperate to form a closed box structure. The fourth collection shell 16 is a particle catcher at the bottom inside the air box 2. The cross-section of the fourth collection shell 16 is a right trapezoid. The height on the right side of the fourth collection shell 16 is higher than that on the left side. A number of grid holes are arranged on the upper side of the fourth collection shell 16. The grid holes are used to guide the metal particles inside the air box 2 into the fourth collection shell 16. When the metal particles do not fall into the fourth collection shell 16 through the grid holes on the fourth collection shell 16, due to the inclination of the fourth collection shell 16, the metal particles slide down due to gravity to the adjacent grid holes and finally fall into the fourth collection shell 16. A guiding member 17 is fixedly connected inside the grid holes of the fourth collection shell 16. The cross-sectional area of the upper part of the guiding member 17 is larger than that of the lower part, imitating the principle of a fishing cage, so that the metal particles can easily fall into the fourth collection shell 16 along the guiding member 17 and are difficult to escape.

[0030] The above settings can achieve that when the three-position isolating grounding switch 9 needs to contact the isolating contact 6, the three-position isolating grounding switch 9 swings upward to make the three-position isolating grounding switch 9 contact the isolating contact 6, achieving the effect of power-off.

[0031] Before the three-position isolating grounding switch 9 contacts the isolating contact 6, it first contacts the pressing plate 504, causing the three-position isolating grounding switch 9 to press the pressing plate 504 during the gradual swinging process. The pressing plate 504 slides along the fixed frame 502 and presses the spring and the contraction member 503 (providing power for the reset of the pressing plate 504).

[0032] When the three-position isolating grounding switch 9 no longer needs to contact the isolating contact 6, the three-position isolating grounding switch 9 swings in the reverse direction to disengage from the pressing plate 504 and the isolating contact 6. The pressing plate 504 resets under the action of the spring and pulls the contraction member 503, enabling the contraction member 503 to collect the surrounding metal particles during both contraction and expansion.

[0033] When the three-position isolating grounding switch 9 needs to contact the grounding contact 11, the three-position isolating grounding switch 9 swings downward to make the three-position isolating grounding switch 9 contact the grounding contact 11. Through the above operations, the effect of releasing residual charges and preventing accidental power-on from causing harm to users and equipment is achieved.

[0034] When the three-position isolating grounding switch 9 no longer needs to contact the grounding contact 11, the three-position isolating grounding switch 9 swings back to its original position to disengage from the grounding contact 11.

[0035] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited by the above embodiments.

Claims

1. A compact ring main unit based on particle control technology, comprising a cabinet body (1), an air box (2), a plurality of partition plates, a power distribution module and a temperature sensor. The cabinet body (1) is fixedly connected to the air box (2), and the plurality of partition plates and the power distribution module are respectively detachably connected to the cabinet body (1) and the air box (2). The power distribution module is located in the air box (2), and the temperature sensor is fixedly connected in the air box (2), characterized in that, A pressure reducing component for reducing the pressure inside the air box (2) is provided inside the cabinet body (1). The pressure reducing component includes an air pump (20), a cooling component (201), a four-way joint (21), a first air pipe (22), a second air pipe (23) and an air supply shell (24). The air pump (20) and the cooling component (201) are connected and both are fixedly connected inside the cabinet body (1). The four-way joint (21) is connected to the air inlet of the air pump (20). The first air pipe (22) is fixedly connected and communicated with the four-way joint (21). The cooling component (201) is fixedly connected and communicated with the air supply shell (24). The second air pipe (23) is fixedly connected and communicated with the air supply shell (24). Both the first air pipe (22) and the second air pipe (23) are communicated with the inside of the air box (2). An adjusting component for adjusting the gas flow mode inside the air supply shell (24) is provided inside the cabinet body (1).

2. The compact ring main unit based on particle control technology according to claim 1, characterized in that, The adjusting component includes a blocking component (25), a gas pushing component (26) and an electric push rod (27). The blocking component (25) is in limit sealing sliding connection with the air supply shell (24), and a compression spring is arranged between the two. The gas pushing component (26) is in sealing sliding inside the air supply shell (24). The electric push rod (27) is fixedly connected inside the cabinet body (1). The telescopic end of the electric push rod (27) is fixedly connected to the gas pushing component (26). There is a gap between the gas pushing component (26) and the blocking component (25).

3. A compact ring main unit based on particle control technology according to claim 2, characterized in that The gas pushing component (26) is fixedly connected with a third air pipe (28). The third air pipe (28) is communicated with the gap between the gas pushing component (26) and the blocking component (25). The third air pipe (28) is fixedly connected and communicated with the four-way joint (21). A pressure relief valve is arranged inside the third air pipe (28).

4. A compact ring main unit based on particle control technology according to claim 1, characterized in that The power distribution module includes a side expansion bus coupler (3), a fixing plate (4), a fixing shell (5), an isolating contact (6), a support frame (7), a rotating rod (8), a three-position isolating earthing switch (9), a support plate (10), an earthing contact (11), a solid-sealed pole column (12), a connecting plate (13) and an outgoing line head (14). The side expansion bus coupler (3), the fixing plate (4), the support frame (7), the solid-sealed pole column (12) and the connecting plate (13) are all fixedly connected inside the air box (2), and the above parts are arranged in order from top to bottom. The fixing shell (5) is fixedly connected to the fixing plate (4). The isolating contact (6) is fixedly connected inside the fixing shell (5). The support frame (7) is rotatably connected to the rotating rod (8). The rotating rod (8) is fixedly connected to the three-position isolating earthing switch (9). The outgoing line head (14) is fixedly connected to the connecting plate (13).

5. A compact ring main unit based on particle control technology according to claim 4, characterized in that, The fixing shell (5) is fixedly connected with a first collection shell (501). The first collection shell (501) is used for collecting metal particles around the isolating contact (6).

6. A compact ring main unit based on particle control technology according to claim 5, characterized in that, A fixing frame (502) is fixedly connected inside the first collection shell (501). The fixing frame (502) is slidably connected with a pressing plate (504), and a spring is arranged between them. A contraction member (503) is fixedly connected between the fixing frame (502) and the pressing plate (504).

7. A compact ring main unit based on particle control technology according to claim 4, characterized in that The support plate (10) is fixedly connected with a second collection shell (1101) for collecting metal particles around the grounding contact (11).

8. A compact ring main unit based on particle control technology according to claim 7, characterized in that, The support frame (7) is fixedly connected with a third collection shell (15) for covering one side of the solid-sealed pole column (12) close to the support plate (10). The third collection shell (15) and the sealing partition plate on the air box (2) cooperate to form a closed box structure.

9. A compact ring main unit based on particle control technology according to claim 8, characterized in that, A fourth collection shell (16) for collecting metal particles inside it is fixedly connected to the bottom inside the air box (2). The cross section of the fourth collection shell (16) is trapezoidal. A plurality of grid holes are arranged on the upper side of the fourth collection shell (16), and a guiding member (17) is fixedly connected in the grid holes of the fourth collection shell (16).

10. A compact ring main unit based on particle control technology according to claim 9, characterized in that, The cross-sectional area of the upper part of the guiding member (17) is larger than that of the lower part.

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