Aerial plug type anti-interference high-capacity three-phase integrated current transformer

Abstract

The invention belongs to the technical field of current transformers, and mainly provides an aviation plug type anti-interference high-capacity three-phase integrated current transformer. The problem that an existing mutual inductor is not accurate enough in detection is solved. Comprising a shell, the shell is fixedly connected with a shell cover, the shell is provided with an aviation plug connector, shielding layers are arranged on the inner side of the shell and the inner side of the shell cover, three iron cores are arranged in the shell, wires are wound around the iron cores, the shell and the shell cover are each provided with two first sliding frames, and the first sliding frames are arranged on the shell cover. The shell and the shell cover are fixedly connected with a plurality of first telescopic rods, and the first sliding frame is fixedly connected with three clamping plates. According to the invention, the cable is clamped by the plurality of clamping plates, so that the cable is located in the center of the threading hole, and the difference of magnetic fields near the cable is reduced, thereby reducing the error when the device detects the current in the cable, and improving the accuracy when the device detects the current in the cable.

Description

Technical Field

[0001] The invention relates to the technical field of current transformers, and in particular to an aviation plug-in type anti-interference large-capacity three-phase integrated current transformer. Background Art

[0002] The aviation plug-in anti-interference large-capacity three-phase integrated current transformer is a specially designed electrical device suitable for application scenarios with high requirements on signal quality and installation efficiency. This type of current transformer can not only accurately measure large currents, but also has good anti-electromagnetic interference performance, and can achieve quick and easy electrical connection through aviation plugs (aviation plugs). It can convert large currents in the power system into smaller secondary currents for easy measurement, protection and control. This type of transformer is usually installed in high-voltage or medium-voltage power systems to monitor the current flowing through transmission lines or distribution systems. Compared with a single independent transformer, the three-phase integrated transformer integrates three transformers in one housing, reducing installation space and cost, and simplifying the installation process.

[0003] When the above-mentioned type of mutual inductor is in use, the cable needs to be passed through the wire threading hole of the mutual inductor, so that the electromagnetic field generated by the current in the cable produces electromagnetic induction with the iron core, and then the iron core and the winding thereon produce electromagnetic induction, and then the current in the winding is detected, and then the current in the cable is calculated based on the current in the winding. The diameter of the existing mutual inductor wire threading hole is larger than the cable diameter to facilitate the cable to pass through, but this will cause the cable to be in a different position in the wire threading hole, and then cause different magnetic fluxes passing through the iron core. At this time, the current data detected by the mutual inductor will be different, affecting the accuracy of the mutual inductor detection. Summary of the invention

[0004] In order to overcome the shortcoming of the existing current transformer that the detection is not accurate enough, the present invention provides an aerial plug-in type anti-interference large-capacity three-phase integrated current transformer.

[0005] The technical solution is as follows: A large-capacity three-phase integrated current transformer with anti-interference by aviation plug-in type, comprising: a shell, the shell is fixedly connected to a shell cover, the shell is provided with an aviation plug connector, the inner side of the shell and the inner side of the shell cover are both provided with a shielding layer, three iron cores are provided in the shell, the iron cores are wound with wires, the shell and the shell cover are each provided with two first sliding frames, the shell and the shell cover are both fixedly connected to a plurality of first telescopic rods, the telescopic ends of the first telescopic rods are slidably connected to the adjacent first sliding frames, and the first sliding frames are fixedly connected to three clamping plates.

[0006] Preferably, the clamping plate is provided with a groove to increase the friction between the clamping plate and the wire.

[0007] Preferably, the groove of the clamping plate has a triangular cross section.

[0008] Preferably, the shell is slidably connected to a second sliding frame distributed symmetrically around the center, the first sliding frame is slidably connected to the adjacent second sliding frame, the shell is fixed with a fixing part, the fixing part is rotatably connected to a rotating part, and both of the second sliding frames are connected to the rotating part through rack and pinion transmission.

[0009] Preferably, the fixing member is slidably connected to a first limiting member, a first spring is arranged between the first limiting member and the fixing member, the rotating member is provided with a plurality of first limiting grooves evenly distributed circumferentially, and the first limiting member is inserted into adjacent first limiting grooves on the rotating member to limit it.

[0010] Preferably, the first limiting member is provided with an inclined surface, so as to enable the first limiting member to limit the rotating member in one direction.

[0011] Preferably, it also includes: second limiting members, the number of which is the same as the number of the first sliding frames, the second limiting members are slidably connected to the adjacent first sliding frames, a second spring is arranged between the second limiting members and the first sliding frame, the second sliding frame is provided with a plurality of second limiting grooves, and the first sliding frame is slidably connected to a sliding rod fixed to the adjacent second limiting member.

[0012] Preferably, a second telescopic rod is provided between the first sliding frames slidably connected to the same second sliding frame, a fixed end and a telescopic end of the second telescopic rod are respectively fixedly connected to adjacent sliding rods, and a connecting rod is fixedly connected between two second telescopic rods.

[0013] Preferably, it also includes: three first shielding parts, all of which are fixed to the shell, the first shielding parts wrap the adjacent iron cores, the first shielding parts are connected to the ground wire, the first shielding parts are electrically connected to symmetrically distributed second shielding parts, and the second shielding parts are fixed to the adjacent clamping plate on the side away from the adjacent first shielding parts.

[0014] Preferably, the shell is filled with an insulating medium for insulating the shell, the shell cover and the wires on the iron core.

[0015] The beneficial effects of the present invention are as follows: the present invention clamps the cable by means of a plurality of clamps, so that the cable is located in the central position of the threading hole, and the difference in the magnetic field near the cable is reduced, thereby reducing the error of the device in detecting the current in the cable, improving the accuracy of the device in detecting the current in the cable, and improving the convenience of the device when connecting through the aviation plug connector, and utilizing the shielding layer to improve the device's anti-interference ability to the magnetic field in the environment.

[0016] The present invention straightens the portion of the cable near the threading hole to adjust the shape of the cable, thereby reducing the difference in magnetic field caused by different cable shapes, and further reducing the error of the device when detecting the current in the cable.

[0017] The present invention shields the portion of the cable near the threading hole by the first shielding member and the second shielding member, thereby shielding the electromagnetic field generated by the current flowing in the cable, reducing the mutual influence of the electromagnetic fields between the cables, and further improving the accuracy of the device in detecting the current in the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a three-dimensional structural cross-sectional view of the housing and the housing cover of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the first sliding frame and the clamping plate of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the rotating member and the first limiting member of the present invention; Figure 5 It is a three-dimensional structural cross-sectional view of the fixed part and the rotating part of the present invention.

[0019] Explanation of the accompanying drawings: 1-shell, 2-shell cover, 3-iron core, 4-first telescopic rod, 5-first sliding frame, 6-clamp, 7-second sliding frame, 8-fixed part, 9-rotating part, 10-first limiting part, 11-second limiting part, 12-sliding rod, 13-second telescopic rod, 14-first shielding part, 15-second shielding part. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0021] A large-capacity, plug-in, anti-interference, three-phase integrated current transformer, such as Figure 1-Figure 3As shown, the housing 1 includes a housing 1, a housing cover 2 is fixedly connected to the housing 1, an aviation plug connector is provided on the housing 1, shielding layers are provided on the inner side of the housing 1 and the inner side of the housing cover 2, three iron cores 3 are provided in the housing 1, and wires are wound around the iron cores 3, the housing 1 and the housing cover 2 are each provided with two first sliding frames 5, the housing 1 and the housing cover 2 are both fixedly connected with a plurality of first telescopic rods 4, the telescopic ends of the first telescopic rods 4 are slidably connected with the adjacent first sliding frames 5, and the first sliding frames 5 are fixedly connected with three clamping plates 6. The clamping plates 6 are provided with grooves for increasing the friction between them and the wires.

[0022] In the above scheme, the aim is to reduce the difference in magnetic field near the cable, thereby reducing the error of the device in detecting the current in the cable. The aviation plug connector is used to connect the device to external measurement and protection equipment, and the shielding layer is used to shield the interference of the external electromagnetic field on the inside of the device. The shell 1 and the shell cover 2 are both provided with threading holes for the cable to pass through. The three threading holes are evenly distributed. The iron core 3 is made of high-quality performance materials with high magnetic permeability and low loss. There are four first telescopic rods 4 in the figure, two on each of the shell 1 and the shell cover 2. Each telescopic end of the first telescopic rod 4 is slidably connected to a first sliding frame 5. The clamping plate 6 is an arc-shaped plate, and the inner diameter of the clamping plate 6 is equal to the inner diameter of the threading hole.

[0023] Further, such as Figure 1 , Figure 3-Figure 5 As shown, the shell 1 is slidably connected to the second sliding frames 7 which are centrally symmetrically distributed, the first sliding frame 5 is slidably connected to the adjacent second sliding frames 7, the shell 1 is fixed with a fixing member 8, the fixing member 8 is rotatably connected to a rotating member 9, and both second sliding frames 7 are connected to the rotating member 9 through rack and pinion transmission.

[0024] In the above scheme, the purpose is to make several clamping plates 6 move synchronously, so that the center between two adjacent clamping plates 6 is always on the axis of the threading hole, so as to ensure that the cable is in the center of the threading hole. The fixed member 8 is annular, the rotating member 9 is located at the center of the fixed member 8, and the two second sliding frames 7 are respectively located on the left and right sides of the rotating member 9, so that the two second sliding frames 7 can only move in opposite directions and move synchronously.

[0025] Further, such as Figure 1 , Figure 4 and Figure 5 As shown, the fixing member 8 is slidably connected with the first limiting member 10, a first spring is arranged between the first limiting member 10 and the fixing member 8, the rotating member 9 is provided with a plurality of first limiting grooves evenly distributed in the circumferential direction, and the first limiting member 10 is inserted into the adjacent first limiting grooves on the rotating member 9 to limit it. The first limiting member 10 is provided with an inclined surface, which is used to enable the first limiting member 10 to limit the rotating member 9 in one direction.

[0026] In the above scheme, the purpose is to limit the rotation member 9 so that the clamping plate 6 can keep clamping the cable. The first limiter 10 is composed of a wedge block, a baffle and a straight rod. The baffle portion of the first limiter 10 is used to provide an installation position for the first spring. The straight rod portion of the first limiter 10 is provided with two arc rods for easy operation. The first limiter 10 limits the rotation member 9 in one direction, so that the clamping plate 6 does not need to operate the first limiter 10 when clamping the cable, thereby improving the convenience of the device during operation.

[0027] When using the device, first install the device near the cable that needs to detect the current, and connect the device to the external measuring device through the aviation plug connector, then pass the cable through the threading hole, and then move the two second sliding frames 7 towards each other, the two second sliding frames 7 respectively drive the adjacent first sliding frames 5 to move, the first sliding frame 5 drives the clamping plate 6 thereon to move, and the two adjacent clamping plates 6 clamp the cable, so as to position the cable so that the cable is in the central position of the threading hole, reduce the difference in the magnetic field near the cable, and thus improve the accuracy of the device in detecting the cable current. When the two second sliding frames 7 move, the second sliding frames 7 drive the rotating member through the rack gear 9 rotates, and the rotating member 9 squeezes the first limiting member 10 when rotating, so that the first limiting member 10 moves downward and compresses the adjacent first spring. When the second sliding frame 7 stops moving, the first limiting member 10 is inserted into the adjacent first limiting groove on the rotating member 9 under the action of the adjacent first spring, thereby limiting the rotating member 9 and maintaining the clamping force of the clamping plate 6 on the cable. When disassembling the device, first pull the first limiting member 10 downward to release the limiting of the rotating member 9, and then move the two second sliding frames 7 in the opposite direction to release the clamping force of the second sliding frame 7 transmission clamping plate 6 on the cable, then take the cable out of the threading hole, and finally disassemble the device.

[0028] When the existing current transformer is used, the cable passing through the threading hole is in a bent state due to reasons such as redundancy. Different bending states of the cables will lead to different electromagnetic fields near the cables, thus affecting the current transformer's detection of the cable current.

[0029] Further, such as Figure 3 As shown, it also includes: second stoppers 11, the number of which is the same as that of the first sliding frames 5, the second stoppers 11 are slidably connected to the adjacent first sliding frames 5, a second spring is provided between the second stoppers 11 and the first sliding frames 5, the second sliding frame 7 is provided with a plurality of second stopper grooves, and the first sliding frame 5 is slidably connected to a sliding rod 12 fixedly connected to the adjacent second stoppers 11. The groove section of the clamping plate 6 is triangular, which is used to make the friction force of the clamping plate 6 different in the upper and lower directions.

[0030] In the above scheme, the cable near the threading hole is straightened to reduce the difference in magnetic field caused by different cable shapes. The second limiting member 11 is a wedge-shaped block to limit the first sliding frame 5 in one direction, so that the clamping plate 6 can fix the cable after straightening it. For example, when the clamping plate 6 is fixed, the resistance encountered by the cable sliding downward relative to the clamping plate 6 is greater than the resistance encountered when sliding upward, so that the device is not easy to slip when straightening the cable, and it is easier to disassemble.

[0031] Further, such as Figure 1 and Figure 3 As shown, a second telescopic rod 13 is arranged between the first sliding frames 5 slidably connected to the same second sliding frame 7 , the fixed end and the telescopic end of the second telescopic rod 13 are respectively fixed to the adjacent sliding rod 12 , and a connecting rod is fixed between the two second telescopic rods 13 .

[0032] In the above scheme, it is intended to shorten the time required for the operation of the device. The four sliding rods 12 are connected by two second telescopic rods 13 and a connecting rod, thereby operating the four sliding rods 12 simultaneously, shortening the time required for the operation of the device.

[0033] After the clamping plate 6 clamps the cable, the four first sliding frames 5 on the upper and lower sides are moved in the opposite direction. The first sliding frame 5 drives the adjacent clamping plates 6 to move, so that the clamping plates 6 straighten the cable, reducing the difference in cable shapes in different threading holes, thereby reducing the error of the device in detecting the cable current. When the first sliding frame 5 moves, the first sliding frame 5 drives the second limiter 11 to move, and the second limiter 11 is squeezed and moved by the adjacent second sliding frame 7. The second limiter 11 compresses the adjacent second spring. When the cable in the threading hole is straightened, the first sliding frame 5 stops moving. At this time, the second limiting member 11 is inserted into the adjacent second limiting groove on the adjacent second sliding frame 7 under the action of the adjacent second spring, so as to keep the cable in a straightened state. When the device is disassembled, after the clamping plate 6 releases the clamping of the cable, the connecting rod between the two second telescopic rods 13 is pulled forward, so that the connecting rod drives the two second telescopic rods 13 to move, and the two second telescopic rods 13 drive the four sliding rods 12 to move, and the sliding rods 12 drive the second limiting member 11 to move, so that the second limiting member 11 releases the limitation on the first sliding frame 5, and then the first sliding frame 5 can be reset.

[0034] Further, such as Figure 2 As shown, it also includes: three first shielding members 14, all of which are fixed to the shell 1, the first shielding members 14 wrap the adjacent iron core 3, the first shielding members 14 are connected to the ground wire, the first shielding members 14 are electrically connected to symmetrically distributed second shielding members 15, and the second shielding members 15 are fixed to the adjacent clamping plate 6 on the side away from the adjacent first shielding members 14. The shell 1 is filled with an insulating medium for insulating the wires on the iron core 3 from the shell 1 and the shell cover 2.

[0035] In the above scheme, the purpose is to shield the magnetic field of the cable near the threading hole to prevent the magnetic fields of the cables from affecting each other. The first shielding member 14 can be a metal shell or a metal mesh, and the second shielding member 15 can be a soft metal mesh. The second shielding member 15 passes through the shell 1 or the shell cover 2 to extend the shielding range. The first shielding member 14 is connected to the ground wire, so that the first shielding member 14 and the second shielding member 15 are maintained at a stable potential, improving the accuracy of the device during detection. The insulating medium in the shell 1 is used to ensure that the device maintains reliable insulation in a high voltage and high current environment, effectively preventing breakdown and flashover phenomena, and ensuring the safe operation of the power system.

[0036] The present invention provides a thought and method. There are many methods and ways to implement the technical solution. The above is only the preferred implementation mode of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. A large-capacity three-phase integrated current transformer with aviation plug-in and anti-interference, characterized in that: Included are: A shell (1), the shell (1) being fixedly connected to a shell cover (2), the shell (1) being provided with an aviation plug connector, the inner side of the shell (1) and the inner side of the shell cover (2) being provided with a shielding layer, three iron cores (3) being provided in the shell (1), the iron cores (3) being wound with wires, the shell (1) and the shell cover (2) being respectively provided with two first sliding frames (5), the shell (1) and the shell cover (2) being fixedly connected to a plurality of first telescopic rods (4), the telescopic ends of the first telescopic rods (4) being slidably connected to adjacent first sliding frames (5), and the first sliding frames (5) being fixedly connected to three clamping plates (6).

2. The large-capacity, three-phase integrated current transformer with aviation plug-in and anti-interference according to claim 1 is characterized in that: The clamping plate (6) is provided with a groove for increasing the friction between the clamping plate (6) and the wire.

3. The large-capacity, three-phase integrated current transformer with aviation plug-in and anti-interference according to claim 2 is characterized in that: The groove of the clamping plate (6) has a triangular cross section.

4. The large-capacity, three-phase integrated current transformer with aviation plug-in and anti-interference according to claim 1 is characterized in that: The housing (1) is slidably connected to a second sliding frame (7) that is centrally symmetrically distributed; the first sliding frame (5) is slidably connected to an adjacent second sliding frame (7); the housing (1) is fixedly connected to a fixing member (8); the fixing member (8) is rotatably connected to a rotating member (9); and both of the second sliding frames (7) are connected to the rotating member (9) via a rack and pinion transmission.

5. The large-capacity, three-phase integrated current transformer with aviation plug-in and anti-interference according to claim 4 is characterized in that: The fixing member (8) is slidably connected to a first limiting member (10), a first spring is provided between the first limiting member (10) and the fixing member (8), the rotating member (9) is provided with a plurality of first limiting grooves evenly distributed in the circumferential direction, and the first limiting member (10) is inserted into adjacent first limiting grooves on the rotating member (9) to limit the rotating member (9).

6. The large-capacity, three-phase integrated current transformer with aviation plug-in and anti-interference according to claim 5 is characterized in that: The first limiting member (10) is provided with an inclined surface, which is used to enable the first limiting member (10) to limit the rotating member (9) in one direction.

7. The large-capacity, three-phase integrated current transformer with aviation plug-in and anti-interference according to claim 4 is characterized in that: Also included are: The number of the second limiting members (11) is the same as the number of the first sliding frames (5); the second limiting members (11) are slidably connected to the adjacent first sliding frames (5); a second spring is provided between the second limiting members (11) and the first sliding frames (5); the second sliding frames (7) are provided with a plurality of second limiting grooves; the first sliding frames (5) are slidably connected to a sliding rod (12) fixedly connected to the adjacent second limiting members (11).

8. The large-capacity, three-phase integrated current transformer with aviation plug-in and anti-interference according to claim 7 is characterized in that: A second telescopic rod (13) is provided between the first sliding frame (5) slidably connected to the same second sliding frame (7); a fixed end and a telescopic end of the second telescopic rod (13) are respectively fixedly connected to adjacent sliding rods (12); and a connecting rod is fixedly connected between the two second telescopic rods (13).

9. The large-capacity, three-phase integrated current transformer with aviation plug-in and anti-interference according to claim 1 is characterized in that: Also included are: The first shielding members (14) are three in number and are all fixedly connected to the shell (1); the first shielding members (14) wrap the adjacent iron core (3); the first shielding members (14) are connected to a ground wire; the first shielding members (14) are electrically connected to symmetrically distributed second shielding members (15); the second shielding members (15) are fixedly connected to the adjacent clamping plate (6) at a side away from the adjacent first shielding member (14).

10. The large-capacity, three-phase integrated current transformer with aviation plug-in and anti-interference according to claim 9, characterized in that: The shell (1) is filled with an insulating medium for insulating the shell (1), the shell cover (2) and the conductors on the iron core (3).

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