Current transformer and production process thereof

Abstract

The invention belongs to the technical field of current transformers, and particularly relates to a current transformer and a production technology thereof.The current transformer comprises a primary winding, the lower end of the primary winding is sleeved with a plurality of secondary windings, an isolation plate is arranged between every two adjacent secondary windings, one end of each isolation plate is fixed to the primary winding, and the other end of each isolation plate is inserted into a groove in the inner side of a shell; epoxy resin is poured in the shell, after the epoxy resin is cured, the lower end of the primary winding and the secondary windings are packaged in the shell, the epoxy resin serves as insulation, and the voltage transformer is suitable for current and electric energy measurement and relay protection in an electric power system with the rated voltage of 66kV and the rated frequency of 50Hz. The oil-free and gas-free SF6 gas insulation device has the advantages of being oil-free, gas-free, flame-retardant, explosion-proof, maintenance-free, high in safety and reliability and the like, is pollution-free to the environment, is a similar product for replacing domestic and external oil insulation and SF6 gas insulation, and is suitable for being used for current and electric energy measurement and relay protection in an electric power system.

Description

Technical Field

[0001] The invention belongs to the technical field of current transformers, and in particular relates to a current transformer and a production process thereof. Background Art

[0002] At present, the current transformers used in 66kV power grids are still mainly oil-immersed current transformers, accounting for more than 50% of the total number of high-voltage transformers in the power grid. Oil-immersed current transformers have been around for a long time, and users are very familiar with their usage and maintenance points. They are also cheap and are still widely used in the earlier power grids. However, this type of transformer is large in size, requires a lot of maintenance, and is prone to fire and explosion. Therefore, oil-immersed products are rarely used in new power grids, and are replaced by high-voltage SF6 gas-insulated current transformers.

[0003] At present, most of the SF6 current transformer composite hollow bushing inner shielding used in substations still adopts a double inner shielding design with complex process, and the shielding structure of the secondary winding is complex and there are potential dangers in transportation. This design is very difficult in terms of process and installation, and an insulating support needs to be added as a support for the middle inner shield, which greatly increases the cost. Summary of the invention

[0004] The object of the present invention is to provide a current transformer and a production process thereof to solve the problems in the prior art. The specific technical scheme is as follows:

[0005] A current transformer comprises a primary winding, wherein a plurality of secondary windings are sleeved on the lower end of the primary winding, an isolation plate is arranged between two adjacent secondary windings, one end of the isolation plate is fixed on the primary winding, and the other end of the isolation plate is inserted into a groove on the inner side of an outer shell, epoxy resin is poured into the outer shell, and after the epoxy resin is cured, the lower end of the primary winding and the plurality of secondary windings are encapsulated in the outer shell.

[0006] Furthermore, two bases are fixed at the lower end of the shell, a shrink shell is fixed at the upper end of the shell, a sealing ring 1 is arranged between the shell and the shrink shell, a composite insulating sleeve is fixed at the upper end of the shrink shell, and a sealing ring 2 is arranged between the shrink shell and the composite insulating sleeve.

[0007] Furthermore, a secondary output terminal box is provided on the side of the shell, the secondary output terminal box is connected to the inside of the shell, a secondary terminal is fixed at the lower end of the secondary output terminal box, the secondary winding and the secondary terminal are connected by a metal wire, the secondary output terminal box is threadedly connected to the fastening screw, and a plug-in box is plugged into the lower end of the secondary output terminal box.

[0008] Furthermore, the upper end of the composite insulating sleeve is fixedly connected to the upper shell through a connecting flange, and the upper end of the upper shell is rotatably connected to an upper cover, the upper cover is provided with a long groove, and the upper end of the long groove is provided with a rainproof boss.

[0009] Furthermore, a gear rod is rotatably connected in the upper shell, and two metal support plates are fixed in the upper shell, and the two metal support plates are respectively located on the upper and lower sides of the gear rod. Two rack plates are slidably connected in the two metal support plates, and the two rack plates are meshed with the gears of the gear rod for transmission. The rack plate is fixedly connected to the primary terminal, and the primary terminal is slidably connected to the metal support plate, and the two ends of the primary winding are respectively connected to the two metal support plates through two metal wires.

[0010] Furthermore, the rotation connection between the gear rod and the upper shell is sealed by a packing.

[0011] A production process of a current transformer, applied to a current transformer as described in any one of the above, comprises the following steps:

[0012] S1. The prepared secondary winding is set on the prepared primary winding, the assembled primary winding and secondary winding are placed in the housing, and the secondary winding is connected to the secondary terminal by a metal wire;

[0013] S2. Pour epoxy resin into the housing through a pouring device. Fill the housing and the secondary outlet terminal box with epoxy resin. After the epoxy resin solidifies, encapsulate the lower end of the primary winding and multiple secondary windings in the housing:

[0014] S3. Install the composite insulating bushing on the outer shell. The upper shell is fixed to the upper end of the composite insulating bushing through a connecting flange. Two primary terminals are arranged in the upper shell. Both ends of the primary winding are connected to the two primary terminals through two metal support plates respectively.

[0015] Further, the casting equipment includes a carrying component, a clamping component and an annular opening and closing casting component;

[0016] The carrying component includes motor 1. Starting motor 1 drives rotating rod 1 and rotating rod 2 to rotate, drives belt 1 and belt 2 to rotate, places the current transformer on belt 1 and belt 2, and the two bases at the lower end of the current transformer are pressed on belt 1 and belt 2 respectively, and the current transformer is moved above the clamping component.

[0017] Furthermore, the clamping component includes motor 2, which drives gear 2 to rotate, drives two racks 2 to move to both sides respectively, drives two clamps to respectively press against the inner sides of two bases, starts cylinder 2, drives the push rod forward, and drives both ends of the push rod forward in the inclined groove, drives the upper plate to move up, drives the two bases to move up through the clamp, drives the current transformer to move up, so that belt 1 and belt 2 are separated from the two bases respectively, starts motor 3, drives the eccentric block to rotate, drives the middle plate to vibrate, drives the current transformer to vibrate, and can discharge bubbles when pouring epoxy resin in the outer shell through the annular opening and closing casting component.

[0018] Further, the annular opening and closing casting component includes a cylinder three, which is fixed on the bracket two, and the cylinder three is started, and the output end of the cylinder three pushes the shell to move forward on the bracket two, the push rod is inserted into the shell, and the extrusion slide bar moves in the shell, driving the spring two to be compressed, driving the two rotating rods one to rotate, driving the two bending rods to move together, driving the two rotating rods two to rotate, driving the two arc plates to move together, and after the ends of the two arc plates are merged, the primary winding is surrounded, and the lower ends of the multiple casting pipes are located at the upper end of the shell, and the pump body is started, and the epoxy resin in the storage tank is poured into the shell through the connecting pipe two, the pump body, the connecting pipe, the bending pipe and the multiple casting pipes;

[0019] When the slide rod moves in the shell, it drives gear three to rotate, drives the moving rod to slide in the shell, drives slide rod two to slide in the shell, drives two sets of rotating rods three to rotate, drives two sets of sliding blocks to meet and slide in the shell, drives two sets of moving rod one to meet and slide, drives two sets of moving rod two to meet and slide, drives two sets of clamps to meet and move, and the two sets of clamps clamp the middle part of the primary winding.

[0020] The advantages of the present invention are:

[0021] Epoxy resin is poured into the shell. After the epoxy resin is cured, the primary winding and the secondary winding are encapsulated in the shell, and the epoxy resin is used as insulation. It is suitable for current, electric energy measurement and relay protection in the power system with a rated voltage of 66kV and a rated frequency of 50Hz. Compared with oil-immersed and gas-type voltage transformers with the same functional use, it has the advantages of oil-free, gas-free, flame-retardant, explosion-proof, maintenance-free, high safety and reliability, and no pollution to the environment. It is a similar product that can replace domestic and foreign oil insulation and SF6 gas insulation. The product is suitable for power systems for current, electric energy measurement and relay protection, and has broad application prospects and good social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The overall structure of the current transformer of the present invention is shown in FIG. Figure 1 ;

[0023] Figure 2 The overall structure of the current transformer of the present invention is shown in FIG. Figure 2 ;

[0024] Figure 3 for Figure 2 A partial enlarged view of the middle part;

[0025] Figure 4 The shell structure of the present invention is shown in FIG. Figure 1 ;

[0026] Figure 5 The shell structure of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0028] Figure 7 The upper shell structure of the present invention is shown in FIG. Figure 1 ;

[0029] Figure 8 The upper shell structure of the present invention is shown in FIG. Figure 2 ;

[0030] Fig. 9 The upper shell structure of the present invention is shown in FIG. Figure 3 ;

[0031] Fig.10 The upper shell structure of the present invention is shown in FIG. Figure 4 ;

[0032] Fig.11 The present invention is a flow chart of the production process of the current transformer;

[0033] Fig.12 It is a schematic diagram of the structure of the pouring equipment of the present invention;

[0034] Fig.13 It is a schematic diagram of the structure of the carrier component of the present invention;

[0035] Fig.14 The clamping component structure of the present invention is schematically shown in FIG. Figure 1 ;

[0036] Fig.15 The clamping component structure of the present invention is schematically shown in FIG. Figure 2 ;

[0037] Fig.16 The clamping component structure of the present invention is schematically shown in FIG. Figure 3 ;

[0038] Fig.17 The structure of the annular opening and closing casting component of the present invention is schematically shown. Figure 1 ;

[0039] Fig.18 The structure of the annular opening and closing casting component of the present invention is schematically shown. Figure 2 ;

[0040] Fig.19 The structure of the annular opening and closing casting component of the present invention is schematically shown. Figure 3 ;

[0041] Fig. 20 The structure of the annular opening and closing casting component of the present invention is schematically shown. Figure 4 ;

[0042] Description of the markings in the figure:

[0043] Shell 1; base 2; primary winding 3; sealing ring 14; secondary winding 5; isolation plate 6; shrink shell 7; composite insulating sleeve 8; secondary outlet terminal box 9; secondary terminal 10; fastening screw 11; plug box 12; connecting flange 13; upper shell 14; upper cover 15; long groove 16; rainproof boss 17; gear rod 18; metal support plate 19; rack plate 20; primary terminal 21; left support plate 22; motor 1 23; rotating rod 1 24; belt 1 25; rotating rod 2 26; belt 2 27; right support plate 28; slide plate 29; pulley 30; cylinder 1 31; motor 2 32; upper plate 33; gear two 34; rack two 35; splint 36; cylinder two 37; push rod 38; inclined slot 39; middle plate 40; bottom plate 41; spring one 42; motor three 43; eccentric block 44; bracket one 45; bracket two 46; cylinder three 47; shell 48; push rod 49; slide rod 50; spring two 51; rotating rod one 52; rotating rod two 53; bending rod 54; arc plate 55; pouring pipe 56; bending pipe 57; connecting pipe 58; pump body 59; gear three 60; moving rod 61; sliding rod two 62; rotating rod three 63; slider 64; moving rod one 65; moving rod two 66; splint 67. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] Embodiment 1

[0047] like Figure 1-Figure 20 As shown, a current transformer comprises a primary winding 3, a plurality of secondary windings 5 ​​are sleeved on the lower end of the primary winding 3, an isolation plate 6 is provided between two adjacent secondary windings 5, one end of the isolation plate 6 is fixed on the primary winding 3, and the other end of the isolation plate 6 is plugged into a groove on the inner side of a housing 1, epoxy resin is poured into the housing 1, and after the epoxy resin is cured, the lower end of the primary winding 3 and the plurality of secondary windings 5 ​​are encapsulated in the housing 1;

[0048] The working principle of the above technical solution is as follows: the isolation plate 6 has a magnetic isolation effect to prevent magnetic interference between two adjacent secondary windings 5. In addition, by inserting the isolation plate 6 into the groove on the inner side of the shell 1, the primary winding 3 and the secondary winding 5 can be suspended and fixed in the shell 1, which is convenient for pouring epoxy resin into the shell 1. After the epoxy resin is cured, the primary winding 3 and the secondary winding 5 are encapsulated in the shell 1. The epoxy resin is used as insulation and is suitable for current, electric energy measurement and relay protection in power systems with a rated voltage of 66kV and a rated frequency of 50Hz. Compared with oil-immersed and gas-type voltage transformers with the same functional purposes, it has the advantages of oil-free, gas-free, flame-retardant, explosion-proof, maintenance-free, high safety and reliability, and no pollution to the environment. It is a similar product that replaces domestic and foreign oil insulation and SF6 gas insulation. The product is suitable for power systems for current, electric energy measurement and relay protection, and has broad application prospects and good social and economic benefits.

[0049] Embodiment 2

[0050] like Figure 1-Figure 20 As shown, two bases 2 are fixed at the lower end of the shell 1, a shrink shell 7 is fixed at the upper end of the shell 1, a sealing ring 1 4 is provided between the shell 1 and the shrink shell 7, a composite insulating sleeve 8 is fixed at the upper end of the shrink shell 7, and a sealing ring 2 is provided between the shrink shell 7 and the composite insulating sleeve 8;

[0051] The working principle of the above technical solution is as follows: the two bases 2 are used to conveniently fix the current transformer at a preset position, and the sealing ring 1 4 and the sealing ring 2 shell increase the sealing performance of the current transformer.

[0052] Embodiment 3

[0053] like Figure 1-Figure 20 As shown, a secondary outlet terminal box 9 is provided on the side of the housing 1, the secondary outlet terminal box 9 is communicated with the inside of the housing 1, a secondary terminal 10 is fixed at the lower end of the secondary outlet terminal box 9, the secondary winding 5 is connected to the secondary terminal 10 through a metal wire, the secondary outlet terminal box 9 is threadedly connected with a fastening screw 11, and a plug-in box 12 is plugged into the lower end of the secondary outlet terminal box 9;

[0054] The working principle of the above technical solution is: plug the wire of the test instrument between the secondary terminal 10 and the fastening screw 11, rotate the fastening screw 11, shorten the distance between the secondary terminal 10 and the fastening screw 11, clamp the wire of the test instrument between the secondary terminal 10 and the fastening screw 11, the wire of the test instrument is electrically connected to the secondary terminal 10, plug the plug-in box 12 into the lower end of the secondary outlet terminal box 9, and prevent rain from falling on the secondary terminal 10;

[0055] In addition, the secondary outlet terminal box 9 is connected to the inside of the housing 1 . When epoxy resin is poured into the housing 1 , the epoxy resin fills the secondary outlet terminal box 9 , which can better prevent rainwater from penetrating and causing a short circuit between the secondary terminals 10 .

[0056] Embodiment 4

[0057] like Figure 1-Figure 20 As shown, the upper end of the composite insulating sleeve 8 is fixedly connected to the upper shell 14 through a connecting flange 13, and the upper end of the upper shell 14 is rotatably connected to an upper cover 15, and a long groove 16 is provided on the upper cover 15, and a rainproof boss 17 is provided on the upper end of the long groove 16;

[0058] The upper shell 14 is rotatably connected with a gear rod 18, and two metal support plates 19 are fixed in the upper shell 14. The two metal support plates 19 are respectively located at the upper and lower sides of the gear rod 18. Two rack plates 20 are respectively slidably connected in the two metal support plates 19. Both rack plates 20 are gear-engaged with the gear rod 18 for transmission. The rack plates 20 are fixedly connected to the primary terminal 21, and the primary terminal 21 is slidably connected to the metal support plates 19. The two ends of the primary winding 3 are respectively connected to the two metal support plates 19 through two metal wires;

[0059] The rotation connection between the gear rod 18 and the upper shell 14 is sealed by a packing;

[0060] The working principle of the above technical solution: the upper shell 14, the upper cover 15, the gear rod 18 and the rack plate 20 are all made of insulating materials, and the two ends of the primary winding 3 are electrically connected to the two metal support plates 19 through two metal wires, and the two metal support plates 19 are electrically connected to the two primary terminals 21 respectively;

[0061] Rotate the gear rod 18 to drive the two rack plates 20 to move in opposite directions, drive the two primary terminals 21 to move in opposite directions, and the front ends of the two primary terminals 21 are respectively moved out from the two ends of the upper shell 14, and the external wires to be tested are respectively connected to the two primary terminals 21, and the gear rod 18 is rotated counterclockwise to drive the two rack plates 20 to move together, and drive the two primary terminals 21 to move into the upper shell 14, and rotate the upper cover 15 to block the outlet of the primary terminal 21 on the upper shell 14, and the external wires to be tested are stuck in the long groove 16. The rain shielding boss 17 prevents rainwater from entering the upper shell 14 from the long groove 16. By hiding the primary terminal 21 in the upper shell 14, it can prevent the upper end of the upper cover 15 from being exposed to rainwater and not penetrating along the product surface to the primary terminal, thereby enhancing the insulation effect and being very popular among users.

[0062] Embodiment 5

[0063] like Figure 1-Figure 20 As shown, a production process of a current transformer, applied to a current transformer as described in any one of the above items, comprises the following steps:

[0064] S1. The prepared secondary winding 5 is set on the prepared primary winding 3, the assembled primary winding 3 and the secondary winding 5 are placed in the housing 1, and the secondary winding 5 is connected to the secondary terminal 10 by a metal wire;

[0065] S2. Pour epoxy resin into the housing 1 through a pouring device, fill the housing 1 and the secondary outlet terminal box 9 with epoxy resin, and after the epoxy resin is cured, encapsulate the lower end of the primary winding 3 and the plurality of secondary windings 5 ​​in the housing 1:

[0066] S3. The composite insulating sleeve 8 is mounted on the housing 1, the upper shell 14 is fixed to the upper end of the composite insulating sleeve 8 through the connecting flange 13, the upper shell 14 is provided with two primary terminals 21, and both ends of the primary winding 3 are connected to the two primary terminals 21 through two metal support plates 19;

[0067] The working principle of the above technical solution is as follows: the prepared secondary winding 5 is sleeved on the prepared primary winding 3, the assembled primary winding 3 and secondary winding 5 are placed in the housing 1, the secondary winding 5 is connected to the secondary terminal 10 through a metal wire, epoxy resin is poured into the housing 1 through a pouring device, the epoxy resin fills the housing 1 and the secondary outlet terminal box 9, after the epoxy resin is cured, the lower end of the primary winding 3 and multiple secondary windings 5 ​​are encapsulated in the housing 1, and the epoxy resin is used as insulation. It is suitable for current, electric energy measurement and relay protection in a power system with a rated voltage of 66kV and a rated frequency of 50Hz. Compared with oil-immersed and gas-type voltage transformers with the same functional purposes, it has the advantages of being oil-free, gas-free, flame-retardant, explosion-proof, maintenance-free, safe and reliable, and has no pollution to the environment. The composite insulating sleeve 8 is installed on the housing 1, and the upper shell 14 is fixed to the upper end of the composite insulating sleeve 8 through the connecting flange 13. Two primary terminals 21 are arranged in the upper shell 14. The two ends of the primary winding 3 are respectively connected to the two primary terminals 21 through two metal support plates 19. The two primary terminals 21 are hidden in the upper shell 14, which can prevent the upper end of the upper cover 15 from being penetrated along the product surface to the primary terminal when being exposed to rain, thereby enhancing the insulation effect.

[0068] Embodiment 6

[0069] like Figure 1-Figure 20 As shown, the casting equipment includes a carrying component, a clamping component and a ring-shaped opening and closing casting component;

[0070] The carrying component includes a motor 23, which is fixed on the left support plate 22, and the output end of the motor 23 is connected to a rotating rod 24, which is connected to a belt 25 in transmission cooperation, and the rotating rod 24 is connected to a rotating rod 26 in sliding cooperation, and the rotating rod 26 is connected to a belt 27 in transmission cooperation, and the rotating rod 26 is connected to a right support plate 28 in rotation, and the right support plate 28 is fixedly connected to a slide plate 29, and a pulley 30 is connected to the lower end of the left support plate 22 in rotation, and the pulley 30 rotates on the slide plate 29, and the right support plate 28 is fixedly connected to a cylinder 31, and the output end of the cylinder 31 is connected to the left support plate 22, and the current transformer is placed on the belt 25 and the belt 27, and the two bases 2 at the lower end of the current transformer are pressed on the belt 25 and the belt 27 respectively, and the motor 23 is started to drive the rotating rod 24 and the rotating rod 26 to rotate, and the belt 25 and the belt 27 are driven to rotate, and the current transformer is moved above the clamping component;

[0071] The working principle of the above technical solution is as follows: the secondary winding 5 and the isolation plate 6 are installed on the primary winding 3, the assembled primary winding 3, the secondary winding 5 and the isolation plate 6 are placed in the housing 1, the above assembled part of the current transformer is placed on the belt 1 25 and the belt 2 27, the two bases 2 at the lower end of the housing 1 are pressed on the belt 1 25 and the belt 2 27 respectively, the motor 1 23 is started, the rotating rod 1 24 is driven to rotate, the rotating rod 26 is driven to rotate, the belt 1 25 and the belt 2 27 are driven to rotate, and the current transformer is driven to move forward, the current transformer moves to the top of the clamping component, the clamping component clamps the current transformer, the annular opening and closing casting component casts epoxy resin into the housing 1, the casted current transformer continues to move forward for drying, and the rear current transformer moves and continues to move to the top of the clamping component for epoxy resin casting, the automation degree is high, and the epoxy resin casting efficiency is fast;

[0072] Start the cylinder 1 31, thereby changing the distance between the left support plate 22 and the right support plate 28, driving the sliding between the rotating rod 1 24 and the rotating rod 26, driving the pulley 30 to rotate on the slide plate 29, thereby adapting to the transportation of current transformers of different sizes.

[0073] Embodiment 7

[0074] like Figure 1-Figure 20As shown, the clamping component includes a motor 2 32, which is fixed at the lower end of the upper plate 33, and the output end of the motor 2 32 is connected to the gear 2 34. There are two racks 2 35 on both sides of the gear 2 34 for gear meshing transmission. The ends of the two racks 2 35 are fixedly connected to the two clamping plates 36 respectively. The lower end of the upper plate 33 is slidably connected to the middle plate 40 through a pillar, the middle plate 40 is fixedly connected to the cylinder 2 37, and the output end of the cylinder 2 37 is fixedly connected to the push rod 38. Bevel grooves 39 are provided on both sides of the upper plate 33, and both ends of the push rod 38 slide in the bevel grooves 39. The lower end of the middle plate 40 is fixedly connected to one end of the spring 1 42, and the other end of the spring 1 42 is fixedly connected to the bottom plate 41. The bottom of the middle plate 40 is fixed with a motor 3 43, and the motor 3 The output end of the machine 3 43 is connected to the eccentric block 44, the motor 2 32 is started, the gear 2 34 is driven to rotate, the two racks 2 35 are driven to move to both sides respectively, the two clamping plates 36 are driven to respectively abut against the inner sides of the two bases 2, the cylinder 2 37 is started, the push rod 38 is driven to move forward, the two ends of the push rod 38 are moved forward in the inclined slot 39, the upper plate 33 is driven to move upward, the two bases 2 are driven to move upward through the clamping plate 36, the current transformer is driven to move upward, so that the belt 1 25 and the belt 2 27 are separated from the two bases 2 respectively, the motor 3 43 is started, the eccentric block 44 is driven to rotate, the middle plate 40 is driven to vibrate, the current transformer is driven to vibrate, and bubbles can be discharged when the epoxy resin is poured in the housing 1 through the annular opening and closing casting component;

[0075] The working principle of the above technical solution is as follows: when the current transformer is carried to the upper end of the upper plate 33, the motor 2 32 is started to drive the gear 2 34 to rotate, drive the two racks 2 35 to move to both sides respectively, drive the two clamping plates 36 to respectively abut against the inner sides of the two bases 2, start the cylinder 2 37, drive the push rod 38 to move forward, and the two ends of the push rod 38 move forward in the inclined groove 39, drive the upper plate 33 to move upward, so that the current transformer is separated from the belt 1 25 and the belt 2 27, so as to prevent the current transformer from causing damage to the belt 1 25 and the belt 2 27 when vibrating in the later stage;

[0076] Start the motor 3 43, drive the eccentric block 44 to rotate, drive the middle plate 40 to vibrate, drive the upper plate 33 to vibrate, drive the two clamping plates 36 to vibrate, drive the current transformer to vibrate, and when pouring epoxy resin in the shell 1 through the annular opening and closing casting component, the bubbles can be discharged to prevent the epoxy resin from not being able to completely fill the shell 1, and there will be gaps in the shell 1, resulting in poor insulation effect.

[0077] Embodiment 8

[0078] like Figure 1-Figure 20As shown, the annular opening and closing casting component includes a cylinder three 47, and the cylinder three 47 is fixed on the bracket two 46. The lower end of the bracket two 46 is slidably connected with the bracket one 45. The output end of the cylinder three 47 is connected to the shell 48, and the shell 48 slides on the bracket two 46. A push rod 49 is fixed at the front end of the bracket two 46. A sliding rod 50 is slidably connected in the shell 48. A spring two 51 is provided between the sliding rod 50 and the inner wall of the shell 48. There are two rotating rods one 52 on both sides of the sliding rod 50 for meshing transmission. One end of the rotating rod one 52 and the rotating rod two 53 are both rotated on the shell 48, and the other ends of the rotating rod one 52 and the rotating rod two 53 are both rotatably connected with the bending rod 54. The bending rod 54 is fixedly connected to the arc plate 55. A plurality of casting pipes 56 are fixed on the arc plate 55. The plurality of casting pipes 56 are all connected with the bending pipe 57. The bending pipe 57 is connected to one end of the pump body 59 through the connecting pipe 58, and the other end of the pump body 59 is connected to the storage tank through the connecting pipe two.

[0079] The slide bar 50 is meshed with the gear 3 60 for transmission, the gear 3 60 rotates in the housing 48, the gear 3 60 is meshed with the moving rod 61 for transmission, the moving rod 61 is fixedly connected with the slide bar 2 62, the moving rod 61 and the slide bar 2 62 both slide in the housing 48, the slide bar 2 62 is rotatably connected with one end of the rotating rod 3 63, the other end of the rotating rod 3 63 is rotatably connected to the slider 64, the slider 64 slides in the housing 48, the slider 64 is fixedly connected with the moving rod 1 65, the moving rod 1 65 is slidably connected with the moving rod 2 66, a nut is threadedly connected to the moving rod 2 66, and a clamping plate 67 is fixed to the end of the moving rod 2 66;

[0080] Start the cylinder 3 47, the output end of the cylinder 3 47 pushes the housing 48 to move forward on the bracket 2 46, the push rod 49 is inserted into the housing 48, the extrusion slide rod 50 moves in the housing 48, the spring 2 51 is compressed, the two rotating rods 1 52 are rotated, the two curved rods 54 are moved together, the two rotating rods 2 53 are rotated, the two arc plates 55 are moved together, and the ends of the two arc plates 55 are combined to surround the primary winding 3, the lower ends of the multiple casting pipes 56 are located at the upper end of the housing 1, the pump body 59 is started, and the epoxy resin in the storage tank is poured into the housing 1 through the connecting pipe 2, the pump body 59, the connecting pipe 58, the curved pipe 57 and the multiple casting pipes 56;

[0081] When the slide bar 50 moves in the housing 48, it drives the gear 3 60 to rotate, drives the moving rod 61 to slide in the housing 48, drives the slide bar 2 62 to slide in the housing 48, drives the two sets of rotating rods 3 63 to rotate, drives the two sets of sliders 64 to meet and slide in the housing 48, drives the two sets of moving rods 1 65 to meet and slide, drives the two sets of moving rods 2 66 to meet and slide, drives the two sets of clamping plates 67 to meet and move, and the two sets of clamping plates 67 clamp the middle part of the primary winding 3;

[0082] The working principle of the above technical solution is as follows: the cylinder 3 47 is started, the output end of the cylinder 3 47 pushes the shell 48 to move forward on the bracket 2 46, the push rod 49 is inserted into the shell 48, the extrusion slide rod 50 moves in the shell 48, the spring 2 51 is compressed, the two rotating rods 1 52 are rotated, the two bending rods 54 are moved together, the two rotating rods 2 53 are rotated, the two arc plates 55 are moved together, and the ends of the two arc plates 55 are merged to surround the primary winding 3, and multiple pouring pipes 56 are formed in a ring shape and enclosed at the upper end of the shell 1. The multiple pouring pipes 56 pour into the shell 1 at the same time to improve the pouring efficiency;

[0083] After the pouring is completed, the cylinder 3 47 is started again, and the output end of the cylinder 3 47 pulls the housing 48 to move backward on the bracket 2 46, and the push rod 49 is separated from the slide rod 50. Under the elastic force of the spring 2 51, the slide rod 50 is driven to move forward in the housing 48, driving the rotating rod 1 52 and the rotating rod 2 53 to rotate, driving the two bent rods 54 to move to both ends, and the housing 48 continues to move backward, driving the arc plate 55 and the multiple casting tubes 56 to move backward, and the cast current transformer moves forward, and the second circuit transformer moves to the top of the upper plate 33 for epoxy resin pouring;

[0084] When the slide bar 50 moves in the shell 48, it drives the gear three 60 to rotate, drives the moving rod 61 to slide in the shell 48, drives the slide bar two 62 to slide in the shell 48, drives the two groups of rotating rods three 63 to rotate, drives the two groups of sliders 64 to meet and slide in the shell 48, drives the two groups of moving rods one 65 to meet and slide, drives the two groups of moving rods two 66 to meet and slide, drives the two groups of clamps 67 to meet and move, the two groups of clamps 67 clamp the middle part of the primary winding 3, when multiple casting tubes 56 move to the top of the shell 1, the clamps 67 clamp the middle part of the primary winding 3, prevent the primary winding 3 from tilting when the current transformer is cast, and ensure the structural neatness of the current transformer.

[0085] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A current transformer, characterized in that: The invention comprises a primary winding (3), wherein a plurality of secondary windings (5) are sleeved on the lower end of the primary winding (3), an isolation plate (6) is provided between two adjacent secondary windings (5), one end of the isolation plate (6) is fixed on the primary winding (3), and the other end of the isolation plate (6) is inserted into a groove on the inner side of an outer shell (1), epoxy resin is poured into the outer shell (1), and after the epoxy resin is cured, the lower end of the primary winding (3) and the plurality of secondary windings (5) are encapsulated in the outer shell (1).

2. A current transformer according to claim 1, characterized in that: Two bases (2) are fixed at the lower end of the outer shell (1), a shrinkable shell (7) is fixed at the upper end of the outer shell (1), a sealing ring (4) is provided between the outer shell (1) and the shrinkable shell (7), a composite insulating sleeve (8) is fixed at the upper end of the shrinkable shell (7), and a sealing ring (2) is provided between the shrinkable shell (7) and the composite insulating sleeve (8).

3. A current transformer according to claim 2, characterized in that: A secondary outlet terminal box (9) is provided on the side of the housing (1); the secondary outlet terminal box (9) is in communication with the interior of the housing (1); a secondary terminal (10) is fixed at the lower end of the secondary outlet terminal box (9); the secondary winding (5) and the secondary terminal (10) are connected via a metal wire; the secondary outlet terminal box (9) is threadedly connected to a fastening screw (11); and a plug-in box (12) is plugged into the lower end of the secondary outlet terminal box (9).

4. A current transformer according to claim 3, characterized in that: The upper end of the composite insulating sleeve (8) is fixedly connected to the upper shell (14) via a connecting flange (13); the upper end of the upper shell (14) is rotatably connected to an upper cover (15); the upper cover (15) is provided with a long groove (16); and the upper end of the long groove (16) is provided with a rainproof boss (17).

5. A current transformer according to claim 4, characterized in that: A gear rod (18) is rotatably connected in the upper shell (14), two metal support plates (19) are fixed in the upper shell (14), the two metal support plates (19) are respectively located at the upper and lower sides of the gear rod (18), two rack plates (20) are respectively slidably connected in the two metal support plates (19), the two rack plates (20) are both meshed with the gears of the gear rod (18) for transmission, the rack plates (20) are fixedly connected to the primary terminal (21), the primary terminal (21) is slidably connected to the metal support plates (19), and the two ends of the primary winding (3) are respectively connected to the two metal support plates (19) through two metal wires.

6. A current transformer according to claim 5, characterized in that: The rotation connection between the gear rod (18) and the upper shell (14) is sealed by a packing.

7. A production process for a current transformer, applied to a current transformer according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. The prepared secondary winding (5) is sleeved on the prepared primary winding (3), the assembled primary winding (3) and the secondary winding (5) are placed in the housing (1), and the secondary winding (5) is connected to the secondary terminal (10) by a metal wire; S2. Pour epoxy resin into the housing (1) through a pouring device, fill the housing (1) and the secondary outlet terminal box (9) with epoxy resin, and after the epoxy resin is cured, encapsulate the lower end of the primary winding (3) and the plurality of secondary windings (5) in the housing (1): S3. The composite insulating sleeve (8) is mounted on the housing (1), and the upper shell (14) is fixed to the upper end of the composite insulating sleeve (8) via a connecting flange (13). Two primary terminals (21) are provided in the upper shell (14), and the two ends of the primary winding (3) are respectively connected to the two primary terminals (21) via two metal support plates (19).

8. The production process of a current transformer according to claim 7, characterized in that: The pouring equipment comprises a carrying part, a clamping part and an annular opening and closing pouring part; The carrying component comprises a motor 1 (23). When the motor 1 (23) is started, the rotating rod 1 (24) and the rotating rod 2 (26) are driven to rotate, and the belt 1 (25) and the belt 2 (27) are driven to rotate. The current transformer is placed on the belt 1 (25) and the belt 2 (27). The two bases (2) at the lower end of the current transformer are pressed on the belt 1 (25) and the belt 2 (27) respectively, and the current transformer is moved above the clamping component.

9. A production process for a current transformer according to claim 8, characterized in that: The clamping component comprises a second motor (32), which starts a second cylinder (37) to drive a push rod (38) to move forward, and the two ends of the push rod (38) move forward in the inclined groove (39), driving the upper plate (33) to move upward, driving the two bases (2) to move upward through the clamping plate (36), driving the current transformer to move upward, so that the first belt (25) and the second belt (27) are separated from the two bases (2) respectively, and starting a third motor (43) to drive the eccentric block (44) to rotate, drive the middle plate (40) to vibrate, drive the current transformer to vibrate, and discharge bubbles when pouring epoxy resin in the shell (1) through the annular opening and closing casting component.

10. A production process for a current transformer according to claim 9, characterized in that: The annular opening and closing casting component comprises a cylinder three (47), which is fixed on the bracket two (46). When the cylinder three (47) is started, the output end of the cylinder three (47) pushes the shell (48) on the bracket two (46) to move forward, the push rod (49) is inserted into the shell (48), and the extrusion slide rod (50) moves in the shell (48), driving the spring two (51) to be compressed, driving the two rotating rods one (52) to rotate, and driving the two bending rods (54) to move forward. ) move together, driving the two rotating rods (53) to rotate, driving the two arc plates (55) to move together, and after the ends of the two arc plates (55) are merged, the primary winding (3) is surrounded therein, and the lower ends of the plurality of pouring pipes (56) are located at the upper end of the outer shell (1), and the pump body (59) is started, and the epoxy resin in the storage tank is poured into the outer shell (1) through the connecting pipe (2), the pump body (59), the connecting pipe (58), the bent pipe (57) and the plurality of pouring pipes (56).

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