Inflatable cabinet and system

Abstract

The present invention provides an inflatable cabinet and system, belonging to the technical field of electrical equipment; the inflatable cabinet includes a cabinet body, a busbar room, a switch room and a circuit breaker room are arranged in the cabinet body, the busbar room is used to set the busbar, the switch room is used to set the switch, and the circuit breaker room is used to set the circuit breaker pole. The present invention also includes a three-position switch, the three-position switch is fixedly arranged in the cabinet body through a side-mounted insulator, the three-position switch is directly connected to the circuit breaker pole installed in the circuit breaker room through a copper bar, and the busbar room, the switch room and the circuit breaker room are sealed in the same gas chamber through the three-position switch. The present invention can effectively solve the technical problems in the prior art that the switch cabinet adopts a compartment sleeve to connect the three-position switch and the circuit breaker, resulting in a complex gas box structure and high gas box processing cost.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to an inflatable cabinet and a system. Background Art

[0002] The gas-filled cabinet is a new generation of switchgear, i.e., indoor AC high-voltage gas-insulated metal-enclosed switchgear. The main switch can use either a permanent magnetic mechanism vacuum circuit breaker or a spring mechanism vacuum circuit breaker. The whole cabinet adopts a combination of air insulation and sulfur hexafluoride gas compartment, and has the following characteristics: compact structure, easy expansion, and suitable for distribution automation. The cabinet has a solid structure and good air tightness. Each functional unit is an independent module and easy to assemble. It is equipped with an independent pressure relief channel to maximize personal safety and equipment operation.

[0003] There are three types of main busbars for inflatable cabinets: top connection, side connection, and on-site busbar connection with vacuum inflating. In terms of manufacturing and installation process requirements, on-site busbar connection is easy to achieve, followed by top connection, and side connection has the highest requirements; in terms of cost, on-site busbar connection has the lowest cost, followed by side connection, and top connection has the highest requirements; in terms of product quality control, top connection is the best, followed by side connection, and on-site busbar connection has the lowest cost.

[0004] A variety of inflatable cabinet structures are disclosed in the prior art. For example, the utility model with announcement number: CN219739745U discloses a 40.5kV high-current inflatable cabinet structure, including a double-group knife isolating switch assembly, a cabinet and a heat dissipation assembly, wherein the double-group knife isolating switch assembly is arranged in the cabinet, and the heat dissipation assembly is arranged on the cabinet; the cabinet includes a first box body part, a second box body part and a third box body part, the second box body part is arranged between the first box body part and the third box body part, and the double-group knife isolating switch assembly is arranged in the second box body part; in this scheme, by arranging an internal heat dissipation part, the temperature on the pole can be quickly taken away, so that the pole is always used within a safe range, and at the same time, the first heat dissipation fin group, the second heat dissipation fin group and the third heat dissipation fin group can accelerate the heat radiation efficiency of the entire cabinet, and 4 sets of fans are installed to enhance air circulation, so that the whole cabinet can better exchange heat with the surrounding environment, thereby achieving the product temperature rise reaching the standard value.

[0005] The inflatable cabinets in the prior art have the following disadvantages:

[0006] First, the gas filling cabinet in the prior art is fixed with a three-position switch. Currently, the TGP-40.5 switch cabinet uses a compartment sleeve to connect the three-position switch and the circuit breaker, which results in a complex gas box structure and high gas box processing cost.

[0007] Second, the current transformer in the existing inflatable cabinet is installed in the cable room, and the cable head is above the current transformer. The current transformer cannot protect the cable head. When a fault occurs at the cable head during the operation of the power grid system, it is easy to cause a power outage in the entire system.

[0008] Third, the current transformer in the existing inflatable cabinet is installed in the cable room, and the cable head is above the current transformer. The current transformer cannot protect the cable head. When a fault occurs at the cable head during the operation of the power grid system, the insulation of the overlapping part between the cable head and the inner cone is damaged, forming an arc, causing combustion or even explosion, thereby causing damage to the cabinet and even safety accidents.

[0009] Fourth, in the PT solution with line in the gas cabinet, the PT current transformer is installed on the top of the gas box. Considering transportation factors, it often has to be installed on the project site. During the installation process, the operating space is small, the PT current transformer is heavy, and the PT current transformer is inconvenient and difficult to install.

[0010] Fifth, after the overall assembly of the inflatable cabinet is completed, if the circuit breaker sealed pole needs to be replaced, the operating space is small and the sealed pole is heavy, making replacement difficult. Summary of the invention

[0011] The purpose of the present invention is to provide an inflatable cabinet and system, which can effectively solve the technical problem that the switch cabinet in the prior art uses a compartment sleeve to connect a three-position switch and a circuit breaker, resulting in a complex gas box structure and high gas box processing cost.

[0012] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0013] An inflatable cabinet comprises a cabinet body, wherein a busbar chamber, a switch chamber and a circuit breaker chamber are arranged in the cabinet body, wherein the busbar chamber is used to arrange a busbar, the switch chamber is used to arrange a switch, and the circuit breaker chamber is used to arrange a circuit breaker pole. The invention also comprises a three-position switch, wherein the three-position switch is fixedly arranged in the cabinet body through a side-mounted insulator, and the three-position switch is directly connected to the circuit breaker pole installed in the circuit breaker chamber through a copper busbar. The busbar chamber, the switch chamber and the circuit breaker chamber are sealed in the same gas chamber by the arranged three-position switch.

[0014] Furthermore, the overlapping surface of the copper busbar is provided with a plating structure.

[0015] The plating structure is a silver layer, and the copper busbar overlap surface is embossed after being silver plated.

[0016] Furthermore, pads are provided at the overlapping surfaces of the copper busbars, and the contact area is increased by the provided pads.

[0017] The busbar comprises a busbar body and an extended busbar bushing, both ends of the busbar body are provided with the extended busbar bushing, and the cross-section of the busbar body is a D-shaped structure.

[0018] Furthermore, in actual use, a static contact of an isolating switch is also provided on the busbar body.

[0019] In actual use, the traditional busbar of the inflatable cabinet adopts a copper bar structure, which is a wide and thin structure. It is fastened with bolts when overlapped with the extended busbar sleeve. Due to the thin characteristics of the copper bar, its fastening bolts and nuts are exposed, and its irregular tip will form a local high electric field for the electric field of the entire busbar system, thereby affecting the insulation of the product. Based on the busbar copper bar, this application has made adaptive improvements, and improved the rectangular cross-section of the copper bar into a letter "D" shaped structure. In the electric field, the structure has a more uniform electric field and no special local high electric field exists.

[0020] For further optimization, a shielded isolating switch is also provided in the cabinet, and the shielded isolating switch includes a moving knife support frame of the isolating switch, a moving knife contact spring and a moving contact. The two ends of the moving knife support frame of the isolating switch are circular structures, and a clearance opening is provided on the side of the moving knife support frame of the isolating switch, and a through groove perpendicular to the clearance opening is provided on the side of the moving knife support frame of the isolating switch. A support block is provided in the moving knife support frame of the isolating switch, and there are several moving contacts, which are installed in the moving knife support frame of the isolating switch. The moving contacts are slidably installed on both sides of the support block, and the two ends of the spring are respectively connected to the moving contacts located at the two ends of the support block. Under the action of the spring, the moving contact moves toward the center position of the support block.

[0021] To ensure tighter contact and improve the conduction effect. The isolating switch moving knife support frame is used to connect with the insulating main shaft in the cabinet.

[0022] The knife-type isolating switch in the prior art mainly consists of a bracket, a contact spring, a support block, and a moving knife conductor; the contact spring, support block, and moving knife of the structure extend out of the bracket. Due to the presence of tip burrs and irregular chamfers on the spring, support block, moving knife and other components, this structure is very likely to form a local tip electric field in a high-voltage electric field, resulting in tip discharge and reducing the insulation performance of the product. In the present application, the bracket of the isolating switch is optimized and extended, and is rounded and polished. The moving knife head adopts a ball head structure. The improved structure places the spring, support block, and moving contact in the moving knife support frame of the isolating switch; the end of the moving knife support frame of the isolating switch is an arc-shaped structure, which can optimize the electric field and effectively improve the electric field uniformity of the isolating switch.

[0023] Among them, bolt shielding rings are provided at both ends of the copper bar, countersunk holes are provided on the bolt shielding rings, the copper bar includes a first copper bar and a second copper bar, the first copper bar and the second copper bar are respectively located on both sides of the conductor and are in close contact with the conductor, the bolt shielding rings are located on both sides of the first copper bar and the second copper bar and correspond to the side surfaces of the first copper bar and the second copper bar respectively, and the bolt shielding rings located on both sides of the first copper bar and the second copper bar are connected by bolts.

[0024] Furthermore, a plurality of climbing-enhancing sheds are arranged on the insulating main shaft, wherein the insulating main shaft is a hexagonal shaft structure.

[0025] In actual use, the climbing-enhancing parachute skirts are connected to form an integrated structure.

[0026] Furthermore, a cable room is provided in the cabinet, the cable room is located below the circuit breaker room, a mounting plate is provided between the cable room and the circuit breaker room, a sinking sleeve is fixedly provided on the mounting plate, an inner cone sleeve is provided inside the sinking sleeve, and a current transformer is movably provided outside the sinking sleeve.

[0027] The sinking sleeve is fixed on the mounting plate by welding.

[0028] Furthermore, the current transformer is movably installed on the outside of the sinking sleeve through an adjusting mechanism.

[0029] Further optimization, the adjustment mechanism includes a support plate, a screw and a threaded sleeve, the support plate is slidably mounted on the mounting plate, the threaded sleeve is mounted on the support plate, the screw is rotatably mounted on the screw and cooperates with the threaded sleeve, after the screw is rotated, the support plate can be close to or away from the mounting plate, and the current transformer is fixedly mounted on the support plate. In actual use, the position of the current transformer can be adjusted by adjusting the position of the support plate, so that the installation height of the current transformer can be adjusted, so that the cable can be within the protection range of the current transformer when inserted into the inner cone bushing.

[0030] Furthermore, in actual use, nitrogen is used to charge the gas charging cabinet. In the present application, the nitrogen is dried and then sealed in the gas charging cabinet as the insulating medium of the primary main circuit. Nitrogen has stable chemical properties, is easy to obtain, has no greenhouse effect, and its decomposition products are non-toxic and will not cause secondary harm to operators after arcing occurs in the switchgear.

[0031] Among them, further in the present application, the circuit breaker pole is disassembled and assembled using a circuit breaker pole auxiliary tooling, including a bottom plate, a top plate and a pole guard plate, a driving mechanism is arranged between the bottom plate and the top plate, the driving mechanism is used to drive the top plate close to or away from the bottom plate, the pole guard plate is fixedly arranged on the top plate, and a roller is arranged on the bottom plate.

[0032] Furthermore, the driving mechanism is a hydraulic driving mechanism or a pneumatic driving mechanism, and specifically may be: a hydraulic cylinder or a pneumatic cylinder.

[0033] The driving mechanism includes a double-headed screw, two groups of first support frames and two groups of second support frames, the first support frame and the second support frame each include a first support rod and a second support rod, the first support rod and the second support rod are connected by a rotating shaft, the upper end of the first support rod is hinged to the top plate, the lower end of the second support rod is hinged to the bottom plate, a threaded hole is provided on the rotating shaft, and the two ends of the double-headed screw are respectively matched with the rotating shafts in the first support frame and the second support frame. In actual use, the driving of the top plate is achieved by rotating the double-headed screw.

[0034] In actual use, the driving mechanism may also be a jack.

[0035] In actual use:

[0036] 1) Place the auxiliary tooling under the circuit breaker pole to be removed;

[0037] 2) Shake the lifting jack to raise the top plate until it contacts the circuit breaker pole.

[0038] 3) Remove the fixing bolts of the circuit breaker pole;

[0039] 4) Reduce the height of tooling;

[0040] 5) Use the bottom plate roller to transport the circuit breaker pole to the rear inspection and assembly hole of the gas box;

[0041] 6) Remove the faulty circuit breaker pole;

[0042] To install a new circuit breaker pole, perform the above steps in reverse.

[0043] Furthermore, a PT current transformer is provided on the box body, and the PT current transformer is installed using the following auxiliary installation structure;

[0044] Among them, the auxiliary installation structure includes a first bracket and a second bracket, the second bracket is vertically installed on the side of the first bracket, the first bracket and the second bracket are both used to be fixedly connected to the cabinet body, a supporting slide is arranged on the second bracket, the supporting slide is slidably installed on the second bracket, and a movable pulley assembly is arranged on the supporting slide.

[0045] In actual use, the PT current transformer is hoisted by means of a movable pulley assembly, so that after the PT current transformer reaches a suitable position, the position is adjusted by moving the supporting slide plate.

[0046] Furthermore, in actual use, a free first driving unit is provided on the second bracket, and the first driving unit is used to drive the supporting slide plate to slide on the second bracket.

[0047] Furthermore, the supporting slide plate is slidably mounted on the second bracket via a sliding assembly.

[0048] Furthermore, the movable pulley assembly is specifically an electric hoist or a hand hoist.

[0049] Furthermore, the first bracket includes parallel columns and a plurality of first beams connecting the columns. The columns are slidably connected to the second bracket, and a plurality of second beams connected to the cabinet are arranged on the columns.

[0050] Furthermore, the second bracket includes a plurality of third beams and a plurality of fourth beams, and the third beams and the fourth beams are spliced ​​to form the second bracket.

[0051] Furthermore, in actual use, the mobile pulley assembly is slidably installed on the supporting slide, so that the mobile pulley assembly can move on the supporting slide to achieve position adjustment during the lifting process.

[0052] In addition, the present invention also discloses an electrical system, including a gas charging cabinet, wherein the gas charging cabinet is the gas charging cabinet described above.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] The three-position switch of the present invention is fixedly arranged in the cabinet through a side-mounted insulator, and the three-position switch is directly connected to the circuit breaker pole through a copper busbar. The present invention can realize that the busbar room, switch room, and circuit breaker room are sealed in the same air chamber, simplifying the gas box structure, facilitating production and processing, and reducing costs. The present invention can realize the current transformer to protect the cable head. When a fault occurs at the cable head during the operation of the power grid system, the cabinet at that time will be cut off first, and the normal power supply of other cabinets in the system will not be affected. The tooling disclosed in the present invention can be used to hoist and install the PT current transformer, which is convenient for the installer to complete the assembly smoothly. The tooling is not only simple in structure, easy to manufacture, and low in cost, but also can effectively improve work efficiency and reduce work intensity. At the same time, the present invention can also realize convenient disassembly and assembly of the circuit breaker pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0056] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0057] Figure 2 The figure is a schematic diagram of the positional relationship between the side-mounted insulator and the three-position switch of the present invention.

[0058] Figure 3 It is a schematic diagram of the positional relationship between the inner cone casing and the sinking sleeve of the present invention.

[0059] Figure 4 It is a schematic diagram of the connection relationship between the cable and the inner cone sleeve of the present invention.

[0060] Figure 5 This is a schematic diagram of the installation relationship between the climbing-enhancing shed and the insulating main shaft of the present invention.

[0061] Figure 6 It is a schematic structural diagram of the shielded isolating switch of the present invention.

[0062] Figure 7 For the present invention Figure 6 Side view of.

[0063] Figure 8 For the present invention Figure 6 Top view of the .

[0064] Fig. 9 It is a schematic diagram of the structure of the busbar of the present invention.

[0065] Fig.10 For the present invention Fig. 9 Top view of the .

[0066] Fig.11 It is a schematic diagram of the overall structure of the circuit breaker pole auxiliary tooling of the present invention.

[0067] Fig.12 It is a schematic diagram of the overall structure of the auxiliary installation structure of the present invention.

[0068] Reference numerals:

[0069] 101 cabinet, 102 busbar room, 103 switch room, 104 circuit breaker room, 105 busbar, 106 three-position switch, 107 side-mounted insulator, 108 copper bar, 109 circuit breaker pole, 110 cable room, 111 current transformer, 112 mounting plate, 113 sinking sleeve, 114 inner cone bushing, 115 adjustment mechanism, 116 busbar body, 117 extended busbar bushing, 118 isolating switch static contact, 119 isolating switch moving knife support frame, 120 moving knife contact spring, 121 moving contact, 122 through slot, 123 make way, 124 bolt Shielding ring, 125 first copper bar, 126 second copper bar, 127 climbing skirt, 128 insulating main shaft, 129 bottom plate, 130 top plate, 131 pole guard plate, 132 driving mechanism, 133 first support frame, 134 second support frame, 135 first support rod, 136 third cross beam, 137 fourth cross beam, 138 second support rod, 139 rotating shaft, 140 double-headed screw, 141 first bracket, 142 second bracket, 143 electric hoist, 144 supporting slide plate, 145 sliding assembly, 146 column, 147 first cross beam, 148 second cross beam. DETAILED DESCRIPTION

[0070] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature. Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0071] See also Figure 1-Figure 2 The present embodiment discloses an inflatable cabinet, including a cabinet 101, wherein a busbar chamber 102, a switch chamber 103 and a circuit breaker chamber 104 are arranged in the cabinet 101, wherein the busbar chamber 102 is used to arrange a busbar 105, the switch chamber 103 is used to arrange a switch, and the circuit breaker chamber 104 is used to arrange a circuit breaker pole 109. The present embodiment also includes a three-position switch 106, wherein the three-position switch 106 is fixedly arranged in the cabinet 101 through a side-mounted insulator 107, and the three-position switch 106 is directly connected to the circuit breaker pole 109 installed in the circuit breaker chamber 104 through a copper bus 108. The busbar chamber 102, the switch chamber 103 and the circuit breaker chamber 104 can be sealed in the same gas chamber by the arrangement of the three-position switch 106.

[0072] Furthermore, the overlapping surface of the copper busbar 108 is provided with a coating structure, which is a silver layer, and the overlapping surface of the copper busbar 108 is embossed after being silver-plated.

[0073] Furthermore, pads are provided at the overlapping surfaces of the copper busbar 108 to increase the contact area.

[0074] Furthermore, a columnar heat sink block is provided on the copper busbar, and the purpose of heat dissipation can be effectively achieved through the provision of the columnar heat sink block.

[0075] Furthermore, the cabinet 101 is provided with a top sealing plate and a rear sealing plate, and the top sealing plate and the rear sealing plate are made of aluminum plates. After the stainless steel plates are replaced with aluminum plates, the heat dissipation efficiency can be greatly improved and the heat circulation during the operation of the switch can be accelerated.

[0076] Furthermore, a base is provided at the bottom of the cabinet 101, and heat dissipation holes are provided on the base. The provided base can accelerate the circulation of air and improve the heat dissipation effect.

[0077] Furthermore, in actual use, a plurality of toothed heat dissipation plates are provided on the top sealing plate and the rear sealing plate.

[0078] In the prior art, a compartment bushing is used to connect the three-position switch 106 and the circuit breaker. In the present application, a side-mounted insulator 107 is used for fixing, and the three-position switch 106 is directly connected to the circuit breaker pole 109 through a copper bar 108. The advantage of this embodiment is that the busbar chamber 102, the switch chamber 103, and the circuit breaker chamber 104 can be sealed in the same gas chamber, which simplifies the gas box structure, is easy to produce and process, and reduces costs.

[0079] Furthermore, in some preferred implementation cases, since the current transformer 111 in the gas-filled cabinet is installed in the cable room 110, the cable head is above the current transformer 111, and the current transformer 111 cannot protect the cable head. When a fault occurs at the cable head during the operation of the power grid system, it is easy to cause a power outage in the entire system. At the same time, the current transformer 111 in the existing gas-filled cabinet is installed in the cable room 110, and the cable head is above the current transformer 111. The current transformer 111 cannot protect the cable head. When a fault occurs at the cable head during the operation of the power grid system, the insulation of the overlapped part of the cable head and the inner cone (inner cone casing 114) is destroyed, forming an arc, causing combustion, or even explosion, thereby causing damage to the cabinet 101, or even a safety accident.

[0080] To solve the above technical problems, see Figure 3-Figure 5 In some preferred implementation cases, a cable chamber 110 is provided in the cabinet 101, and the cable chamber 110 is located below the circuit breaker chamber 104. A mounting plate 112 is provided between the cable chamber 110 and the circuit breaker chamber 104, and a sinking sleeve 113 is fixedly provided on the mounting plate 112, an inner cone sleeve 114 is provided inside the sinking sleeve 113, and a current transformer 111 is movably provided outside the sinking sleeve 113.

[0081] The sinking sleeve 113 is fixed on the mounting plate 112 by welding.

[0082] Furthermore, the current transformer 111 is movably installed outside the sinking sleeve 113 through the adjustment mechanism 115 .

[0083] Furthermore, in actual use, the adjustment mechanism 115 includes a support plate, a screw and a threaded sleeve. The support plate is slidably mounted on the mounting plate 112, the threaded sleeve is mounted on the support plate, the screw is rotatably mounted on the screw and cooperates with the threaded sleeve, and after the screw is rotated, the support plate can be close to or away from the mounting plate 112, and the current transformer 111 is fixedly mounted on the support plate. In actual use, the position of the current transformer 111 can be adjusted by adjusting the position of the support plate, so that the installation height of the current transformer 111 can be adjusted, so that the cable can be within the protection range of the current transformer 111 when inserted into the inner cone bushing 114.

[0084] In this embodiment, the installation position of the current transformer 111 is adjusted by the adjustment mechanism 115, so that the current transformer 111 can protect the cable head. When a fault occurs at the cable head during the operation of the power grid system, the cabinet 101 at that time is powered off first, and the normal power supply of other cabinets 101 in the system is not affected. The current transformer 111 can protect the cable head. When the current transformer 111 detects a fault at the cable head, the cabinet 101 is powered off first, and arcing can be avoided, thereby improving the safety of use.

[0085] Further, in some preferred implementation cases, see Figure 6-Figure 10 The busbar 105 includes a busbar body 116 and an extended busbar bushing 117. The extended busbar bushing 117 is disposed at both ends of the busbar body 116. The cross-section of the busbar body 116 is a D-shaped structure.

[0086] Furthermore, in some preferred implementation cases, a disconnector static contact 118 is also provided on the busbar body 116 .

[0087] In actual use, the traditional inflatable cabinet busbar 105 adopts a copper bar 108 structure, which is a wide and thin structure. It is fastened with bolts when overlapped with the extended busbar sleeve 117. Due to the thin characteristics of the copper bar 108, its fastening bolts and nuts are exposed, and its irregular tip will form a local high electric field for the electric field of the entire busbar 105 system, thereby affecting the insulation of the product. Based on the copper bar 108 of the busbar 105, the present application has made adaptive improvements, and the rectangular cross-section of the copper bar 108 has been improved to a letter "D" shaped structure. In the electric field, the structure has a more uniform electric field and no special local high electric field exists.

[0088] The knife-type isolating switch in the prior art mainly consists of a bracket, a contact spring, a support block, and a movable knife conductor; the contact spring, the support block, and the movable knife extend out of the bracket. Due to the presence of tip burrs and irregular chamfers on the spring, the support block, the movable knife and other components, it is very easy to form a local tip electric field in a high voltage electric field, thereby causing tip discharge and reducing the insulation performance of the product.

[0089] Furthermore, in some preferred implementation cases, a shielded isolating switch is also provided in the cabinet 101, and the shielded isolating switch includes an isolating switch moving blade support frame 119, a moving blade contact spring 120 and a moving contact 121. The two ends of the isolating switch moving blade support frame 119 are circular structures, and the side of the isolating switch moving blade support frame 119 is provided with a clearance opening, and the side of the isolating switch moving blade support frame 119 is provided with a through groove 122 perpendicular to the clearance opening 123. A support block is provided in the isolating switch moving blade support frame 119, and there are several moving contacts 121, which are installed in the isolating switch moving blade support frame 119. The moving contact 121 is slidably installed on both sides of the support block, and the two ends of the spring are respectively connected to the moving contacts 121 located at the two ends of the support block. Under the action of the spring, the moving contact 121 moves toward the center of the support block to ensure that it is more closely connected during contact and improve the conduction effect. The isolating switch moving blade support frame 119 is used to connect with the insulating main shaft 128 in the cabinet 101.

[0090] In the present application, the bracket of the isolating switch is optimized and extended, and is rounded and polished. The moving knife head adopts a ball head structure. The improved structure places the spring, support block, and moving contact 121 in the isolating switch moving knife support frame 119; the end of the isolating switch moving knife support frame 119 is an arc-shaped structure, which can achieve optimization of the electric field and effectively improve the electric field uniformity of the isolating switch.

[0091] Furthermore, in some preferred implementation cases, bolt shielding rings 124 are provided at both ends of the copper bar 108, countersunk holes are provided on the bolt shielding rings 124, the copper bar 108 includes a first copper bar 125 and a second copper bar 126, the first copper bar 125 and the second copper bar 126 are respectively located on both sides of the conductor and are in close contact with the conductor, the bolt shielding rings 124 are located on both sides of the first copper bar 125 and the second copper bar 126 and correspond to the sides of the first copper bar 125 and the second copper bar 126 respectively, and the bolt shielding rings 124 located on both sides of the first copper bar 125 and the second copper bar 126 are connected by bolts. Since the traditional copper busbar 108 overlaps and the copper busbar 108 and the casing are overlapped and directly connected by bolts, the bolt heads, spring flat washers, nuts, etc. will form sharp burrs after tightening, thereby affecting the conductor electric field of the entire main circuit; the present application adopts an overlapping shielding ring structure, and at the same time uses locking bolts to connect the copper busbar 108 and the conductor. After the connection is completed, the bolt heads and spring flat washers are completely embedded in the countersunk holes in the shielding ring, which can effectively improve the uniformity of the entire electric field.

[0092] Furthermore, a plurality of climbing-enhancing sheds 127 are provided on the insulating main shaft 128. The insulating main shaft 128 is a hexagonal shaft structure.

[0093] In actual use, the climbing sheds 127 are connected to form an integrated structure. The insulation capacity of the conventional isolating switch transmission shaft is mainly determined by the insulation performance of the material itself and the surface of the material. In the present application, the insulating shaft 128 is improved. By setting a number of climbing sheds 127 structures, the surface insulation performance of the transmission shaft can be greatly increased, and the risk of surface insulation failure of the conventional insulating shaft 128 due to factors such as dirt is reduced.

[0094] Furthermore, in actual use, nitrogen is used to charge the gas charging cabinet. In the present application, the nitrogen is dried and then sealed in the gas charging cabinet as the insulating medium of the primary main circuit. Nitrogen has stable chemical properties, is easy to obtain, has no greenhouse effect, and its decomposition products are non-toxic and will not cause secondary harm to operators after arcing occurs in the switchgear.

[0095] Furthermore, after the overall assembly of the inflatable cabinet is completed, if the circuit breaker pole 109 needs to be replaced, the operating space is small and the circuit breaker pole 109 is heavy, making replacement difficult. In some preferred implementation cases, auxiliary tooling for the circuit breaker pole 109 is used for disassembly and assembly, see Fig.11 , including a bottom plate 129, a top plate 130 and a pole guard plate 131, a driving mechanism 132 is arranged between the bottom plate 129 and the top plate 130, the driving mechanism 132 is used to drive the top plate 130 to approach or move away from the bottom plate 129, the pole guard plate 131 is fixedly arranged on the top plate 130, and a roller is arranged on the bottom plate 129.

[0096] Furthermore, the driving mechanism 132 is a hydraulic driving mechanism 132 or a pneumatic driving mechanism 132 , and specifically can be: a hydraulic cylinder or a pneumatic cylinder.

[0097] In this embodiment, the driving mechanism 132 includes a double-headed screw 140, two groups of first support frames 133 and two groups of second support frames 134. The first support frame 133 and the second support frame 134 both include a first support rod 135 and a second support rod 138. The first support rod 135 and the second support rod 138 are connected by a rotating shaft 139. The upper end of the first support rod 135 is hinged to the top plate 130, and the lower end of the second support rod 138 is hinged to the bottom plate 129. The rotating shaft 139 is provided with a threaded hole. The two ends of the double-headed screw 140 are respectively matched with the rotating shafts 139 in the first support frame 133 and the second support frame 134. In actual use, the driving of the top plate 130 is achieved by rotating the double-headed screw 140.

[0098] In actual use, the driving mechanism 132 may also be a jack.

[0099] In actual use:

[0100] 1) Place the auxiliary tooling under the circuit breaker pole 109 to be removed;

[0101] 2) Shake the lifting jack to raise the top plate 130 until it contacts the pole.

[0102] 3) Remove the fixing bolts of the circuit breaker pole 109;

[0103] 4) Reduce the height of tooling;

[0104] 5) The circuit breaker pole 109 is transported to the rear inspection and assembly hole of the gas box by rollers on the bottom plate 129;

[0105] 6) Remove the fault circuit breaker pole 109;

[0106] To install a new circuit breaker pole 109, just perform the above operations in reverse.

[0107] During the disassembly and assembly process of the circuit breaker pole 109, the tooling can support and transport the circuit breaker pole 109, so that the construction personnel can smoothly dismantle the circuit breaker pole 109 and replace the circuit breaker pole 109. The tooling can be raised and lowered to adjust the height, which can adapt to the disassembly and assembly of the tooling; the tooling can be easily moved, which is convenient for the transportation of the circuit breaker pole 109.

[0108] Furthermore, in actual use, a guide groove corresponding to the roller is also provided in the cabinet body to control the path and facilitate positioning operations during disassembly and assembly.

[0109] Furthermore, in some preferred implementation cases, a PT current transformer is provided on the box, and the PT current transformer is installed using the following auxiliary installation structure;

[0110] See also Fig.12 The auxiliary mounting structure includes a first bracket 141 and a second bracket 142. The second bracket 142 is vertically mounted on the side of the first bracket 141. The first bracket 141 and the second bracket 142 are both used to be fixedly connected to the cabinet 101. A supporting slide 144 is arranged on the second bracket 142. The supporting slide 144 is slidably mounted on the second bracket 142. A movable pulley assembly is arranged on the supporting slide 144.

[0111] In actual use, the PT current transformer is hoisted by means of the provided movable pulley assembly, so that after the PT current transformer reaches a suitable position, the position is adjusted by moving the supporting slide plate 144 .

[0112] Furthermore, in actual use, a first driving unit is disposed on the second bracket 142 , and the first driving unit is used to drive the supporting slide plate 144 to slide on the second bracket 142 .

[0113] Furthermore, the supporting slide plate 144 is slidably mounted on the second bracket 142 via a sliding assembly 145 .

[0114] Furthermore, the movable pulley assembly is specifically an electric hoist 143 or a hand hoist.

[0115] Furthermore, the first bracket 141 includes parallel columns 146 and a plurality of first beams 147 connecting the columns 146 . The columns 146 are slidably connected to the second bracket 142 . The columns 146 are provided with a plurality of second beams 148 connected to the cabinet 101 .

[0116] Furthermore, the second bracket 142 includes a plurality of third beams 136 and a plurality of fourth beams 137 , and the third beams 136 and the fourth beams 137 are spliced ​​to form the second bracket 142 .

[0117] Furthermore, in actual use, the mobile pulley assembly is slidably installed on the supporting slide 144, so that the mobile pulley assembly can move on the supporting slide 144 to achieve position adjustment during the lifting process.

[0118] The auxiliary installation structure can be used to hoist and install the PT current transformer, making it easy for the installer to complete the assembly smoothly. The tooling is not only simple in structure, easy to make, and low in cost, but also can effectively improve work efficiency and reduce work intensity.

[0119] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0120] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An inflatable cabinet, comprising a cabinet body, wherein a busbar chamber, a switch chamber and a circuit breaker chamber are arranged in the cabinet body, wherein the busbar chamber is used to arrange a busbar, the switch chamber is used to arrange a switch, and the circuit breaker chamber is used to arrange a circuit breaker pole, wherein: It also includes a three-position switch, which is fixedly arranged in the cabinet through a side-mounted insulator, and the three-position switch is directly connected to the circuit breaker pole installed in the circuit breaker chamber through a copper bar, so that the busbar chamber, the switch chamber and the circuit breaker chamber are sealed in the same gas chamber through the three-position switch; The copper busbar overlap surface is provided with a plating structure, a pad is provided at the copper busbar overlap surface, the contact area is increased by the pad, and a columnar heat sink is provided on the copper busbar, and the heat dissipation purpose can be achieved by the columnar heat sink; A cable room is provided in the cabinet, and the cable room is located below the circuit breaker room. A mounting plate is provided between the cable room and the circuit breaker room, and a sinking sleeve is fixedly provided on the mounting plate, and an inner cone sleeve is provided inside the sinking sleeve, and a current transformer is movably provided outside the sinking sleeve; The current transformer is movably installed on the outside of the sinking sleeve through an adjusting mechanism; The adjustment mechanism includes a support plate, a screw and a threaded sleeve. The support plate is slidably installed on the mounting plate, the threaded sleeve is installed on the support plate, the screw is rotatably installed on the screw and cooperates with the threaded sleeve. After rotating the screw, the support plate can be close to or away from the mounting plate, and the current transformer is fixedly arranged on the support plate; by adjusting the position of the support plate, the position of the current transformer can be adjusted, so that the installation height of the current transformer can be adjusted, so that the cable can be within the protection range of the current transformer when inserted into the inner cone bushing.

2. The inflatable cabinet according to claim 1, characterized in that: The busbar comprises a busbar body and an extended busbar bushing. The extended busbar bushings are arranged at both ends of the busbar body. The cross section of the busbar body is a D-shaped structure.

3. The inflatable cabinet according to claim 2, characterized in that: A shielded isolating switch is also provided in the cabinet, and the shielded isolating switch includes a moving knife support frame of the isolating switch, a moving knife contact spring and a moving contact. The two ends of the moving knife support frame of the isolating switch are circular structures, and a clearance opening is provided on the side of the moving knife support frame of the isolating switch. A through groove perpendicular to the clearance opening is provided on the side of the moving knife support frame of the isolating switch. A support block is provided in the moving knife support frame of the isolating switch. There are several moving contacts, which are installed in the moving knife support frame of the isolating switch. The moving contacts are slidably installed on both sides of the support block, and the two ends of the spring are respectively connected to the moving contacts located at the two ends of the support block. Under the action of the spring, the moving contact moves toward the center position of the support block.

4. The inflatable cabinet according to claim 3, characterized in that: Bolt shielding rings are provided at both ends of the copper bar, and countersunk holes are provided on the bolt shielding rings. The copper bar includes a first copper bar and a second copper bar. The first copper bar and the second copper bar are respectively located on both sides of the conductor and are in close contact with the conductor. The bolt shielding rings are located on both sides of the first copper bar and the second copper bar and correspond to the side surfaces of the first copper bar and the second copper bar respectively. The bolt shielding rings located on both sides of the first copper bar and the second copper bar are connected by bolts.

5. The inflatable cabinet according to claim 1, characterized in that: The circuit breaker pole is disassembled and assembled using a circuit breaker pole auxiliary tooling, which includes a bottom plate, a top plate and a pole guard plate. A driving mechanism is arranged between the bottom plate and the top plate, and the driving mechanism is used to drive the top plate close to or away from the bottom plate. The pole guard plate is fixedly arranged on the top plate, and a roller is arranged on the bottom plate.

6. The inflatable cabinet according to claim 5, characterized in that: The driving mechanism includes a double-headed screw, two groups of first support frames and two groups of second support frames, the first support frame and the second support frame each include a first support rod and a second support rod, the first support rod and the second support rod are connected by a rotating shaft, the upper end of the first support rod is hinged to the top plate, and the lower end of the second support rod is hinged to the bottom plate, a threaded hole is provided on the rotating shaft, and both ends of the double-headed screw respectively cooperate with the rotating shafts in the first support frame and the second support frame.

7. An electrical system, characterized in that: It comprises an inflatable cabinet, and the inflatable cabinet is an inflatable cabinet as described in any one of claims 1-6.

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