Secondary terminal board for mutual inductor

Abstract

The secondary terminal board comprises a wiring screw rod, a terminal board mold box and mixed resin, internal threaded holes are symmetrically formed in the two ends of the wiring screw rod, the internal threaded holes in the two ends are mutually independent and are not communicated, and at least three first bosses are arranged between the internal threaded holes in the two ends; at least two grooves are formed between the first bosses on the two sides, the outer side of one end of the wiring screw is a milled plane, a plurality of screw hole sites are formed in the two faces of the terminal plate mold box at equal intervals in the circumferential direction, and a plurality of wiring characters are correspondingly arranged on the front face of the terminal plate mold box and located below the screw hole sites. A plurality of number characters are correspondingly arranged on the back face of the terminal board mold box and located below the screw rod hole sites, after the wiring screw rods are installed in the screw rod hole sites, mixed resin is poured into the terminal board mold box, the mixed resin and the wiring screw rods form an integral structure after being placed and solidified, the mixed resin is demolded from the terminal board mold box, and the secondary terminal board is formed. The device has the characteristics of good sealing performance and small size.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage electrical equipment technology, specifically to a secondary terminal block for a current transformer. Background Technology

[0002] In modern power systems, voltage transformers and current transformers are key devices widely used in various voltage and current measurement scenarios. They provide indispensable data support for the stable operation, accurate measurement, and reliable protection of power systems. In order to accurately transmit the electrical signals collected by the transformers to secondary metering, measurement, and protection devices, it is necessary to connect them to other devices through secondary terminals to the secondary terminal block.

[0003] However, the existing secondary terminal blocks commonly use two structures: cable casting type and screw-pressed sealing ring. Among them, the cable casting type terminal block uses single-strand and multi-strand cables. Single-strand cables are relatively hard and difficult to wire, causing inconvenience to operators. Although multi-strand cables solve the problem of difficult wiring, there is a risk of oil leakage between the strands. To prevent oil leakage, it is often necessary to add a partition in the middle, which increases the production process and cost, and also reduces production efficiency.

[0004] The screw-press sealing ring structure terminal board has extremely high requirements for assembly quality. The assembly process is complicated, which increases labor costs and extends the production cycle. In addition, the sealing gasket is prone to aging and damage during long-term use, which can lead to oil leakage, resulting in a decrease in sealing performance and, in severe cases, affecting electrical insulation performance.

[0005] Therefore, it is necessary to design a secondary terminal block for current transformers that has good sealing performance and small size. Utility Model Content

[0006] The purpose of this utility model is to provide a secondary terminal block for current transformers to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a secondary terminal board for a current transformer, comprising a wiring screw, a terminal board mold box, and a mixed resin. The wiring screw has symmetrically arranged internal threaded holes at both ends, which are independent and not connected. At least three first bosses are arranged between the two ends of the internal threaded holes, and at least two grooves are arranged between the first bosses on both sides. One end of the wiring screw has a milled surface on its outer side. The terminal board mold box has a plurality of screw holes equidistantly arranged on both sides in a circumferential direction. A plurality of wiring characters are correspondingly arranged on the front side of the terminal board mold box below the screw holes, and a plurality of quantity characters are correspondingly arranged on the back side of the terminal board mold box below the screw holes. The wiring characters and quantity characters are matched and correspondingly arranged to identify the function and position of each wiring screw. After the wiring screw is installed in the screw hole, the mixed resin is poured into the terminal board mold box. After the mixed resin is placed and cured, it forms an integral structure with the wiring screw and is demolded from the terminal board mold box to form a secondary terminal board.

[0008] According to the above technical solution, the terminal board mold box has an inner ring on both inner sides, and a second boss is provided at the center line of the inner ring. The wiring screw is symmetrically arranged on both sides of each second boss in the radial direction. The wiring character and the quantity character are respectively provided on the front and back of the terminal board mold box above the wiring screw located on both sides of the second boss. A plurality of radial bosses are equidistantly arranged on both sides of the terminal board mold box in the circumferential direction. The radial bosses are arranged at equal angles with the wiring screws and are connected to the inner ring.

[0009] According to the above technical solution, the terminal board mold box is provided with outer ring bands at both ends for fixed installation with retaining rings.

[0010] According to the above technical solution, the wiring characters and the quantity characters are concave on the terminal block mold box.

[0011] According to the above technical solution, the mixed resin is composed of epoxy resin and aluminum oxide mixed in a certain proportion, and the mixed resin is grayish-white in color.

[0012] According to the above technical solution, the first boss and the groove cooperate to form a fixing structure to prevent the wiring screw from shifting relative to the cured mixed resin.

[0013] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0014] (1) By setting up an integrated structure with cured mixed resin and wiring screw, the wiring screw is firmly fixed in the secondary terminal block. This integrated structure not only reduces the volume and weight of the terminal block, but also enhances the sealing of the secondary terminal block, avoids the risk of oil leakage, and effectively blocks external dust and moisture from entering the interior of the terminal block, preventing the wiring screw and internal electrical connection parts from being corroded and causing short circuit faults.

[0015] (2) By setting a milled plane, a first boss and a groove, and by sandblasting and shot blasting one side of the terminal screw, the contact area between the terminal screw and the cast mixed resin is increased. The larger contact area helps the mixed resin to better fill and wrap the terminal screw during the casting process, so that the mixed resin can be more tightly bonded to the terminal screw after curing, which enhances the connection strength and stability between the two, and at the same time strengthens the sealing performance between the terminal screw and the mixed resin, avoiding the risk of oil leakage. The milled plane further enhances the connection force between the cured mixed resin and the terminal screw, and prevents the terminal screw from rotating or detaching inside the mixed resin when the secondary terminal board is subjected to external force or electrical load. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a front structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the rear structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the wiring screw structure of this utility model;

[0020] Figure 4 This is a side view of the present invention;

[0021] In the diagram: 10. Wiring screw; 11. Internal threaded hole; 12. First boss; 13. Groove; 14. Milled surface; 20. Terminal block mold box; 21. Inner ring; 22. Second boss; 23. Radial boss; 24. Outer ring band; 30. Wiring character; 31. Quantity character. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0023] This utility model provides a technical solution: a secondary terminal block for a current transformer, comprising a wiring screw 10, a terminal block mold box 20, and a mixed resin. The wiring screw 10 has symmetrically arranged internal threaded holes 11 at both ends, which are independent and not connected. At least three first bosses 12 are arranged between the two end threaded holes 11, and at least two grooves 13 are arranged between the two side first bosses 12. One end of the wiring screw 10 has a milled surface 14 on its outer side. The terminal block mold box 20 has a plurality of screw holes equidistantly arranged on both sides in a circumferential direction. The front of the mold box 20 has several wiring characters 30 corresponding to the screw hole positions, and the back of the terminal board mold box 20 has several quantity characters 31 corresponding to the screw hole positions. The wiring characters 30 and quantity characters 31 are matched and set to identify the function and position of each wiring screw 10. After the wiring screw 10 is installed in the screw hole position, mixed resin is poured into the terminal board mold box 20. After the mixed resin is placed and cured, it forms an integral structure with the wiring screw 10 and is demolded from the terminal board mold box 20 to form a secondary terminal board.

[0024] This technical solution achieves integrated molding of the wiring screw 10 and the mixed resin, forming a structurally stable secondary terminal board. The internal threaded holes 11 at both ends of the wiring screw 10 facilitate connection with external circuits. The first boss 12, the groove 13, and the milled surface 14 increase the contact area between the wiring screw 10 and the mixed resin. The wiring characters 30 and the quantity characters 31 facilitate accurate identification of the function and position of each wiring screw 10, while not occupying insulation space and reducing the volume of the terminal board.

[0025] Furthermore, the terminal block mold box 20 has an inner ring 21 on both inner sides, and a second boss 22 is provided at the center line of the inner ring 21. Each second boss 22 has a wiring screw 10 symmetrically arranged on both sides in the radial direction. The front and back of the terminal block mold box 20 are respectively provided with wiring characters 30 and quantity characters 31 above the wiring screws 10 located on both sides of the second boss 22. The terminal block mold box 20 has a number of radial bosses 23 equidistantly arranged on both sides in the circumferential direction. The radial bosses 23 are arranged at equal angles with the wiring screws 10 and are connected to the inner ring 21.

[0026] Through this technical solution, the inner ring 21, the second boss 22 and the radial boss 23 enhance the structural strength of the cured mixed resin, optimize the stress distribution of the secondary terminal board, and can increase or decrease the number of wiring screws 10 located on both sides of the second boss 22 according to actual needs.

[0027] Furthermore, the terminal block mold box 20 is provided with outer ring bands 24 at both ends for fixed installation with retaining rings;

[0028] This technical solution facilitates the installation and fixing of the secondary terminal block with other equipment. The outer ring 24 cooperates with the retaining ring, making the installation of the secondary terminal block more convenient and secure. It can adapt to different installation environments and needs, thus enhancing the practicality of the secondary terminal block.

[0029] Furthermore, the wiring character 30 and the quantity character 31 are concave on the terminal block mold box 20;

[0030] With this technical solution, the concave wiring characters 30 and quantity characters 31 are easier to form during the casting process, are not easily worn after forming, and can maintain a clear and identifiable state for a long time, ensuring that operators can always accurately identify the corresponding information of each wiring screw 10. At the same time, the characters are integrally cast with the secondary terminal board, eliminating the need for additional character structures and reducing the volume of the secondary terminal board.

[0031] Furthermore, the mixed resin is composed of epoxy resin and aluminum oxide mixed in a certain proportion, and the mixed resin is grayish-white in color;

[0032] This technical solution utilizes a mixed resin composed of epoxy resin and alumina, which exhibits excellent insulation properties and can meet the electrical performance requirements of instrument transformers.

[0033] Furthermore, the first boss 12 and the groove 13 cooperate with each other to form a fixing structure to prevent the wiring screw 10 from shifting relative to the cured mixed resin;

[0034] This technical solution effectively prevents the wiring screw 10 from shifting relative to the cured mixed resin during the use of the secondary terminal block, ensuring the stability of the wiring screw 10 position and avoiding the normal connection of the transformer secondary circuit due to the loosening or shifting of the wiring screw 10, thereby improving the reliability of the secondary terminal block.

[0035] Working principle: First, the wiring screw 10 is installed in the screw hole of the terminal board mold box 20. Then, a gray-white mixed resin composed of epoxy resin and aluminum oxide mixed in a certain proportion is poured into the terminal board mold box 20. The mixed resin fills the space inside the mold box and makes full contact with the wiring screw 10. Since the first boss 12 and the groove 13 on the wiring screw 10 cooperate with each other, the mixed resin will form a firm fixing structure with the wiring screw 10 during the curing process. After the mixed resin is cured, it is demolded from the terminal board mold box 20 to obtain the secondary terminal board.

[0036] In practical use, the wiring screw 10 is connected to the external circuit through the internal threaded holes 11 at both ends. The operator can accurately perform wiring operations according to the wiring characters 30 on the secondary terminal board. The outer ring bands 24 at both ends of the secondary terminal board can cooperate with the retaining rings to realize the installation and fixation of the secondary terminal board and the external equipment.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or specific orientation structure and operation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0038] In the description of this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this utility model, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, those skilled in the art can combine different embodiments or examples and features of different embodiments or examples described in this utility model without contradiction.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A secondary terminal block for a current transformer, comprising a wiring screw (10), a terminal block mold box (20), and a mixed resin, wherein the wiring screw (10) has symmetrically arranged internal threaded holes (11) at both ends, the internal threaded holes (11) at both ends are independent and not connected, at least three first bosses (12) are arranged between the internal threaded holes (11) at both ends, and at least two grooves (13) are arranged between the first bosses (12) on both sides, one end of the wiring screw (10) has a milled surface (14) on its outer side, and the terminal block mold box (20) has a plurality of screw holes equidistantly arranged on both sides in the circumferential direction, the front side of the terminal block mold box (20) having a milled surface (14) on its outer side. Several wiring characters (30) are correspondingly provided below the screw hole, and several quantity characters (31) are correspondingly provided on the back of the terminal board mold box (20) below the screw hole. The wiring characters (30) and the quantity characters (31) are matched and correspondingly provided to identify the function and position of each wiring screw (10). After the wiring screw (10) is installed in the screw hole, the mixed resin is poured into the terminal board mold box (20). After the mixed resin is placed and cured, it forms an integral structure with the wiring screw (10) and is demolded from the terminal board mold box (20) to form a secondary terminal board.

2. The secondary terminal block for a current transformer according to claim 1, characterized in that: The terminal board mold box (20) has an inner ring (21) on both inner sides. A second boss (22) is provided at the center line of the inner ring (21). The wiring screw (10) is symmetrically arranged on both sides of each second boss (22) along the radial direction. The wiring character (30) and the quantity character (31) are respectively provided on the front and back of the terminal board mold box (20) above the wiring screw (10) located on both sides of the second boss (22). A number of radial bosses (23) are equidistantly arranged on both sides of the terminal board mold box (20) in the circumferential direction. The radial bosses (23) are arranged at equal angles with the wiring screws (10) and the radial bosses (23) are connected to the inner ring (21).

3. A secondary terminal block for a current transformer according to claim 2, characterized in that: The terminal block mold box (20) is provided with outer ring bands (24) at both ends for fixed installation with retaining rings.

4. A secondary terminal block for a current transformer according to claim 1, characterized in that: The wiring character (30) and the quantity character (31) are concave on the terminal block mold box (20).

5. A secondary terminal block for a current transformer according to claim 1, characterized in that: The mixed resin is composed of epoxy resin and aluminum oxide mixed in a certain proportion, and the mixed resin is grayish-white in color.

6. A secondary terminal block for a current transformer according to claim 1, characterized in that: The first boss (12) and the groove (13) cooperate to form a fixing structure to prevent the wiring screw (10) from shifting relative to the cured mixed resin.

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