Zero sequence current transformer

Abstract

The utility model discloses a zero sequence current transformer which comprises a lower shell and an upper shell, side blocks are arranged on the two sides of the lower shell, corner rods are arranged on the two sides of the upper shell, and the corner rods are inserted into the side blocks. Positioning mechanisms are oppositely arranged on the two sides of the lower portion of the lower shell and used for stabilizing the lower shell, each positioning mechanism comprises a reinforcing plate, supporting legs are bent at the bottom of the reinforcing plate, extending plates are symmetrically arranged on the two sides of the reinforcing plate, bent plates are arranged at the tail ends of the extending plates, three through holes penetrate through the surface of the reinforcing plate, and bolts penetrate through the through holes. The reinforcing plates are installed on the two sides of the lower shell, and the bottom of the lower shell is supported on the upper surfaces of the supporting blocks, so that the effect of preliminarily positioning the lower shell can be achieved, the lower shell can be quickly and accurately positioned at a preset position, and the problems of position deviation and dislocation are avoided. Due to the fact that the supporting block provides a preliminary positioning function, installation personnel do not need to carry out complex adjustment and calibration work and only need to simply place the lower shell on the supporting block.

Description

Technical Field

[0001] The utility model belongs to the technical field of current transformers, and particularly relates to a zero-sequence current transformer. Background Art

[0002] The zero-sequence current transformer is a single-turn through-type current transformer. When a zero-sequence grounding current is generated in the power system (electric shock or leakage fault), the zero-sequence current is output on the secondary side of the transformer, and is used in cooperation with a relay protection device or a signal to make the device components act, so as to achieve protection or monitoring (cut off the power supply, alarm, etc.). For any circuit with good insulation, the vector sum of the current flowing in and out of the circuit should always be zero. If people find that the vector sum of the current flowing through a certain circuit is not zero, it can be determined that there is a residual current in the circuit.

[0003] At present, the zero-sequence current transformer is not convenient for the transformer to be disassembled for maintenance, and the disassembly method is relatively difficult, which is not conducive to the staff to replace, disassemble and install. At the same time, there is a lack of positioning during the installation of the transformer, and it is more troublesome for the staff to carry out complex adjustment and calibration. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a zero-sequence current transformer to solve the problems of installation, disassembly and positioning installation in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A zero-sequence current transformer includes a lower housing and an upper housing. Side blocks are provided on both sides of the lower housing, and corner rods are provided on both sides of the upper housing, and the corner rods are inserted into the side blocks; positioning mechanisms are provided on both sides below the lower housing, and the positioning mechanisms are used to stabilize the lower housing.

[0007] Further, the positioning mechanism includes a reinforcement plate. A support foot is bent at the bottom of the reinforcement plate. Extension plates are symmetrically arranged on both sides of the reinforcement plate. A bent plate is provided at the tail end of the extension plate. Three through holes are penetrated on the surface of the reinforcement plate, and bolts are installed through the through holes. The reinforcement plate is installed on both sides of the lower housing.

[0008] Further, a support block is fixed on one side of the reinforcement plate, and the upper part of the support block is in an arc structure that fits the outer arc of the lower housing. The support block provides a preliminary positioning function. The installer does not need to carry out complex adjustment and calibration work, and only needs to simply place the lower housing on the support block.

[0009] Further, a winding belt is wound around the extension plate and the side block. By winding the winding belt around the extension plate and the side block, the installation position of the lower housing can be balanced and strengthened. The winding method of the winding belt can provide additional fixing force, making the connection between the lower housing and the extension plate and the side block tighter and more stable.

[0010] Further, a fixing block is provided on the other side of the reinforcing plate. A rotating block is hinged to the fixing block. An auxiliary block is vertically provided above the rotating block. A positioning nut is threadedly connected to the auxiliary block. Through the support of the support block and the extrusion of the positioning nut, the lower housing is doubly fixed, further improving the stability effect. The extrusion effect of the positioning nut can ensure the close fit between the lower housing and the support block, thereby improving the installation accuracy.

[0011] Further, a rubber head is provided at the bottom end of the positioning nut. By rotating the positioning nut, the positioning nut is extruded on the inner surface of the lower housing, and the rubber head will produce elastic deformation, increasing the contact area with the inner surface of the lower housing, thereby improving the stable support effect on the lower housing. At the same time, it can also prevent damage to the inner surface of the lower housing caused by the extrusion force of the positioning nut.

[0012] The technical solution of the present utility model has the following beneficial effects:

[0013] 1. The bottom of the lower housing is supported on the upper surface of the support block, which can play a role in initially positioning the lower housing, enabling it to be quickly and accurately positioned at the predetermined position, avoiding problems of position deviation and misalignment. Since the support block provides the initial positioning function, installers do not need to perform complex adjustment and calibration work, and only need to simply place the lower housing on the support block. This not only saves installation time, but also reduces the operation difficulty and improves the installation efficiency.

[0014] 2. The rotating block flips upward. By tightening the positioning nut on the auxiliary block, the positioning nut will be extruded on the surface of the lower housing, providing a downward extrusion force. Combining with the supporting force of the support block, it not only enhances the stability of the structure, but also improves the strength of the structure. Through the support of the support block and the extrusion of the positioning nut, the lower housing is doubly fixed, further improving the stability effect. The extrusion effect of the positioning nut can ensure the close fit between the lower housing and the support block, thereby improving the installation accuracy.

[0015] 3. When disassembling the upper housing, only need to loosen the nut below the corner rod, and then the upper housing can be disassembled. For the disassembly of the lower housing, remove the winding belt, loosen the positioning nut, flip the rotating block, and slightly loosen the bolt, then the lower housing can be directly taken out, and the undismantled reinforcing plate can facilitate the subsequent reassembly of the lower housing. The installation is convenient and easy to disassemble. Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for the description of the embodiments will be briefly introduced below.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0018] Figure 2 It is a schematic plan view of the present utility model.

[0019] Figure 3 It is a schematic diagram of the positioning mechanism structure of the present utility model.

[0020] Figure 4 It is an enlarged view of part A of the present utility model.

[0021] Figure 5 It is an overall sectional view of the present utility model.

[0022] Reference numerals: 10, lower housing; 11, upper housing; 12, side blocks; 13, corner rods; 14, reinforcement plates; 15, support feet; 16, extension plates; 17, bent plates; 18, support blocks; 19, through holes; 20, bolts; 21, fixing blocks; 22, rotating blocks; 23, auxiliary blocks; 24, positioning nuts; 25, rubber heads; 26, winding tapes. Specific embodiments

[0023] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model.

[0024] Embodiment 1:

[0025] Refer to Figure 1 and Figure 2 , a zero-sequence current transformer, comprising a lower housing 10 and an upper housing 11. Side blocks 12 are provided on both sides of the lower housing 10, and corner rods 13 are provided on both sides of the upper housing 11, wherein the corner rods 13 are inserted into the side blocks 12;

[0026] In the above solution, the lower housing 10 and the upper housing 11 are aligned and spliced for installation. The corner rod 13 is inserted into the side block 12. A threaded structure is provided at the bottom end of the corner rod 13. When the corner rod 13 is inserted into the side block 12, it is tightened with a nut below the corner rod 13 to reinforce the assembly of the lower housing 10 and the upper housing 11. Inserting the corner rod 13 into the side block 12 can achieve precise position positioning and installation to ensure the relative position between the lower housing 10 and the upper housing 11 is accurate, thereby improving the stability of the entire structure. The plug-in positioning method simplifies the assembly process, making the connection between components faster and more convenient. At the same time, it reduces errors and faults caused by improper assembly and improves the installation efficiency.

[0027] Reference Figure 1 , there are positioning mechanisms on both sides below the lower housing 10, and the positioning mechanisms are used to stabilize the lower housing 10. The positioning mechanism includes a reinforcement plate 14. A support foot 15 is bent at the bottom of the reinforcement plate 14. Extension plates 16 are symmetrically arranged on both sides of the reinforcement plate 14. A bent plate 17 is provided at the end of the extension plate 16. Three through holes 19 penetrate the surface of the reinforcement plate 14, and bolts 20 are installed through the through holes 19. The reinforcement plate 14 is installed on both sides of the lower housing 10.

[0028] In the above solution, the top end of the reinforcement plate 14 is arc-shaped to fit the inner diameter of the lower housing 10 to prevent the reinforcement plate 14 from protruding and affecting the wire threading of the current transformer. First, the two reinforcement plates 14 are attached to both sides of the lower housing 10. Then, the bolts 20 are passed through the through holes 19 to connect the two reinforcement plates 14 together. Nuts are tightly installed at the other end of the bolts 20, so that the lower housing 10 is clamped by the reinforcement plates 14 and the lower housing 10 is stabilized between the reinforcement plates 14. An elliptical groove is provided on the surface of the support foot 15. The support foot 15 is attached to the ground or the installation table, and bolts are installed on the elliptical groove to fix the position of the reinforcement plate 14. Holes are provided on the surface of the bent plate 17, and the bending angle of the bent plate 17 is 90°. In this way, the bent plate 17 can be attached to the side wall. Bolts or nuts are installed in the holes on the surface of the bent plate 17 to further stabilize the position of the reinforcement plate 14 and improve the stability of the current transformer on the reinforcement plate 14.

[0029] Further reference Figure 3, a support block 18 is fixed on one side of the reinforcement plate 14, and the upper part of the support block 18 is in an arc structure that fits the outer arc of the lower housing 10. When placing and installing the lower housing 10 between the reinforcement plates 14, the bottom of the lower housing 10 is supported on the upper surface of the support block 18, which can play a role in initially positioning the lower housing 10, enabling it to be quickly and accurately positioned at the predetermined position, avoiding problems of position deviation and misalignment. Since the support block 18 provides the initial positioning function, the installer does not need to perform complex adjustment and calibration work, and only needs to simply place the lower housing 10 on the support block 18. This not only saves installation time, but also reduces the operation difficulty and improves the installation efficiency. The arc design of the support block 18 can evenly distribute the pressure at the bottom of the lower housing 10, avoiding damage or deformation caused by excessive single-point force.

[0030] Further reference Figure 1 , a winding band 26 is wound around the extension plate 16 and the side block 12. By winding the winding band 26 around the extension plate 16 and the side block 12, the installation position of the reinforced lower housing 10 can be balanced. The winding method of the winding band 26 can provide additional fixing force, making the connection between the lower housing 10 and the extension plate 16 and the side block 12 tighter and more stable. This enhanced stability helps prevent the lower housing 10 from moving or tilting during installation or use, thus ensuring the stability of the entire structure. Or the winding band 26 is an elastic band.

[0031] Further reference Figure 1 and Figure 4 , a fixing block 21 is provided on the other side of the reinforcement plate 14, a rotating block 22 is hinged to the fixing block 21, an auxiliary block 23 is vertically provided above the rotating block 22, and a positioning nut 24 is threadedly connected to the auxiliary block 23.

[0032] In the above solution, after the bolt 20 and the winding band 26 are installed, the rotating block 22 is turned upwards, and by tightening the positioning nut 24 on the auxiliary block 23, the positioning nut 24 will squeeze on the surface of the lower housing 10, providing a downward squeezing force. Combining with the supporting force of the support block 18, not only the stability of the structure is enhanced, but also the strength of the structure is improved. Through the support of the support block 18 and the squeezing of the positioning nut 24, the lower housing 10 is doubly fixed, further improving the stability effect. The squeezing effect of the positioning nut 24 can ensure the close fit between the lower housing 10 and the support block 18, thereby improving the installation accuracy.

[0033] Further reference Figure 4, a rubber head 25 is provided at the bottom end of the positioning nut 24. By rotating the positioning nut 24, the positioning nut 24 is pressed against the inner surface of the lower housing 10, and the rubber head 25 will undergo elastic deformation, increasing the contact area with the inner surface of the lower housing 10, thereby improving the stable support effect on the lower housing 10. At the same time, it can also prevent damage to the inner surface of the lower housing 10 caused by the extrusion force of the positioning nut 24.

[0034] In summary, when disassembling the upper housing 11, only the nut below the corner rod 13 needs to be loosened, and the upper housing 11 can be disassembled. For the disassembly of the lower housing 10, remove the winding belt 26, loosen the positioning nut 24, flip the rotating block 26, and slightly loosen the bolt 20, so that the lower housing 10 can be directly taken out. The unremoved reinforcement plate 14 can facilitate the subsequent reassembly of the lower housing 10, with convenient installation and easy disassembly.

[0035] The specific implementation process of this embodiment is as follows:

[0036] During use, the lower housing 10 and the upper housing 11 are aligned and spliced for installation. Insert the corner rod 13 into the side block 12 and tighten it with a nut below the corner rod 13 to reinforce the assembly of the lower housing 10 and the upper housing 11. Fit the two reinforcement plates 14 on both sides of the lower housing 10. Then, pass the bolt 20 through the through hole 19 to connect the two reinforcement plates 14 together, and fasten a nut at the other end of the bolt 20, so that the lower housing 10 is clamped by the reinforcement plates 14 on both sides and stabilized between the reinforcement plates 14. An elliptical groove is provided on the surface of the support foot 15. Fit the support foot 15 on the ground or the installation table, and install a bolt on the elliptical groove to fix the position of the reinforcement plate 14. Holes are provided on the surface of the bending plate 17, and the bending angle of the bending plate 17 is 90°. In this way, the bending plate 17 can be fitted on the side wall, and bolts or nuts are installed in the holes on the surface of the bending plate 17 to further stabilize the position of the reinforcement plate 14. After the bolt 20 and the winding belt 26 are installed, flip the rotating block 22 upward. By tightening the positioning nut 24 on the auxiliary block 23, the positioning nut 24 will be pressed against the surface of the lower housing 10 to provide a downward pressing force. Through the support of the support block 18 and the extrusion of the positioning nut 24, the lower housing 10 is doubly fixed, further improving the stability effect.

[0037] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Within the essence and protection scope of the present invention, various modifications or equivalent replacements can be made to the present invention. Such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present invention.

[0038] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "front", "back", "left", "right", etc. is based on the orientation or positional relationship shown in the attached drawing, or the orientation or positional relationship in which the utility model product is customarily placed during use. It is only used for facilitating the description of the present utility model 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. Therefore, these terms indicating the orientation or positional relationship should not be construed as limitations on the present utility model.

[0039] In the description of the present utility model, it should be further noted that unless otherwise clearly specified and defined, the terms "arranged" and "connected" should be understood in a broad sense. For example, these terms can represent a fixed connection, a detachable connection or an integral connection between elements; they can also represent a mechanical connection or an electrical connection; they can also represent a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of these terms in the present utility model can be understood according to specific circumstances.

Claims

1. A zero-sequence current transformer, comprising a lower housing (10) and an upper housing (11), characterized in that: On both sides of the lower housing (10), there are side blocks (12), and on both sides of the upper housing (11), there are corner rods (13), where the corner rods (13) are inserted into the side blocks (12). There are positioning mechanisms on both sides below the lower housing (10), and the positioning mechanisms are used to stabilize the lower housing (10).

2. The zero-sequence current transformer according to claim 1, characterized in that: The positioning mechanism includes a reinforcement plate (14). At the bottom of the reinforcement plate (14), there is a bent support foot (15). On both sides of the reinforcement plate (14), there are symmetric extension plates (16). At the tail end of the extension plates (16), there are bent plates (17). Three through holes (19) penetrate the surface of the reinforcement plate (14), and bolts (20) are installed through the through holes (19). The reinforcement plate (14) is installed on both sides of the lower housing (10).

3. The zero-sequence current transformer according to claim 2, wherein: On one side of the reinforcement plate (14), there is a support block (18), and the upper part of the support block (18) has an arc-shaped structure that fits the outer arc of the lower housing (10).

4. The zero-sequence current transformer according to claim 2, characterized in that: A winding belt (26) is wound around the extension plates (16) and the side blocks (12).

5. The zero-sequence current transformer according to claim 3, characterized in that: On the other side of the reinforcement plate (14), there is a fixed block (21). A rotating block (22) is hinged to the fixed block (21). Above the rotating block (22), there is a vertical auxiliary block (23), and a positioning nut (24) is threadedly connected inside the auxiliary block (23).

6. The zero-sequence current transformer according to claim 1, wherein: At the bottom end of the positioning nut (24), there is a rubber head (25).

7. The zero-sequence current transformer according to claim 4, wherein: The winding belt (26) is an elastic band.

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