Coil wiring structure and dry-type transformer

Abstract

The utility model discloses a coil wiring structure and a dry-type transformer, the coil wiring structure comprises a dry-type transformer coil and an insulating gland, the dry-type transformer coil is provided with a binding post, and the binding post is used for fixedly connecting a cable; the insulation gland is detachably installed on the dry-type transformer coil, the insulation gland and the dry-type transformer coil define a terminal groove and an installation hole, the binding post is located in the terminal groove, the installation hole is communicated with the terminal groove, the installation hole is used for allowing a cable to penetrate through, and the insulation gland is used for being matched with the dry-type transformer coil to clamp and fix the cable. According to the coil wiring structure provided by the utility model, the cable installation requirement can be reduced, and the connection between the dry-type transformer coil and the cable is firmer.

Description

Technical Field

[0001] This utility model relates to the field of dry-type transformer technology, and in particular to a coil wiring structure and a dry-type transformer. Background Technology

[0002] In existing dry-type transformers, the coil wiring structure generally includes a T-shaped plug sleeve, a fixing nut, and several sealing components. The terminals on the coil, the cable, and the fixing nut are inserted one-to-one into the three ports of the T-shaped plug sleeve. The fixing nut is screwed to the terminal and fixes the cable end to the terminal. Although this wiring structure is convenient to install, it has high installation requirements. It requires precise fit between the T-shaped plug sleeve and the cable, and the cable has high dimensional accuracy requirements. If the cable does not meet the requirements, it may lead to difficulty in insertion and removal or poor contact. In addition, the connection between the cable and the coil is not reliable enough. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a coil wiring structure that can reduce cable installation requirements and make the connection between the dry-type transformer coil and the cable more reliable.

[0004] This utility model also proposes a dry-type transformer with the above-mentioned coil wiring structure.

[0005] According to a first aspect of the present invention, a coil wiring structure includes a dry-type transformer coil and an insulating cover. The dry-type transformer coil is provided with a terminal post for fixing a cable. The insulating cover is detachably installed on the dry-type transformer coil. The insulating cover and the dry-type transformer coil enclose a terminal slot and a mounting hole. The terminal post is located in the terminal slot. The mounting hole communicates with the terminal slot and is used for a cable to pass through. The insulating cover is used to cooperate with the dry-type transformer coil to clamp and fix the cable.

[0006] The coil wiring structure according to the present invention has at least the following beneficial effects: When connecting cables, the coil wiring structure provided by the present invention can first be fixedly connected to the cable through the terminal block, and then the insulating cover cooperates with the dry-type transformer coil to further clamp and fix the cable and form a cover and protection at the connection between the terminal block and the cable. As a result, the cable installation requirements can be reduced and the connection between the dry-type transformer coil and the cable can be made more reliable.

[0007] According to some embodiments of the present invention, a boss is provided on the outer periphery of the dry-type transformer coil, the terminal block is disposed on the boss, the insulating cover is detachably installed on the boss, and the sealing structure is disposed between the insulating cover and the boss.

[0008] According to some embodiments of the present invention, the sealing structure includes a first sealing groove and a first sealing protrusion that cooperate with each other, a second sealing groove and a second sealing protrusion that cooperate with each other, and a third sealing groove and a third sealing protrusion that cooperate with each other. One of the first sealing groove and the first sealing protrusion is disposed on the insulating cover and the other is disposed on the boss. The first sealing protrusion is embedded in the first sealing groove. The first sealing protrusion and the first sealing groove are located on the side of the terminal groove away from the mounting hole. The length of the first sealing groove is along the radial direction of the mounting hole. One of the second sealing groove and the second sealing protrusion is disposed on the insulating cover and the other is disposed on the boss. One of the third sealing groove and the third sealing protrusion is disposed on the insulating cover and the other is disposed on the boss. The second sealing protrusion and the third sealing protrusion are both disposed along the axial direction of the mounting hole, and the terminal groove and the mounting hole are both located between the second sealing protrusion and the third sealing protrusion.

[0009] According to some embodiments of the present invention, the coil wiring structure includes a sealing member, which is used to sleeve the cable and block the entrance of the mounting hole.

[0010] According to some embodiments of the present invention, the sealing member includes two insulating open gaskets. When the two open gaskets are sleeved on the cable, the two open gaskets overlap and abut against each other, and the opening directions of the two open gaskets are opposite to each other.

[0011] According to some embodiments of the present invention, the open gasket is connected to the insulating cover by a flexible insulating strip.

[0012] According to some embodiments of the present invention, the flexible insulating strip is installed on the insulating cover by insulating bolts.

[0013] According to some embodiments of the present invention, the insulating cover and the boss can cooperate to clamp the shed of the extruded cable.

[0014] According to some embodiments of this utility model, the terminal block is used to fix the cable by a wire clamping bolt.

[0015] The dry-type transformer according to a second aspect of the present invention includes the above-described coil wiring structure.

[0016] The dry-type transformer according to the present invention has at least the following beneficial effects: by adopting the above-mentioned coil wiring structure, the cable installation requirements can be reduced, and the connection between the dry-type transformer coil and the cable can be made more reliable.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the coil wiring structure according to an embodiment of the present utility model;

[0020] Figure 2 for Figure 1 A cross-sectional view of the coil wiring structure is shown;

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 for Figure 2 Sectional view at section BB.

[0023] Figure label:

[0024] Dry-type transformer coil 100, terminal block 110, boss 120, first sealing groove 121, second sealing groove 122, third sealing groove 123, insulating cover 200, first sealing protrusion 210, second sealing protrusion 220, third sealing protrusion 230, terminal groove 310, mounting hole 320, sealing part 400, opening gasket 410, flexible insulating tape 510, insulating bolt 520, wire clamping bolt 600, cable 700, shed 710. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They 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 be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0029] In existing dry-type transformers, precise fit between the T-type plug and the cable 700 is required, and the specifications, dimensions, and quality of the cable 700 are subject to high requirements. If the cable 700 does not meet the requirements, it may lead to difficulty in plugging and unplugging or poor contact. Furthermore, the high installation requirements of the cable 700 lead to higher costs for coil wiring. In addition, the T-type plug mainly serves as insulation and protection. Therefore, the cable 700 is only connected to the fixed terminal 110 by fixing bolts, and the connection between the cable 700 and the coil is not reliable enough.

[0030] Reference Figures 1 to 3 According to a first aspect embodiment of the present invention, the coil wiring structure includes a dry-type transformer coil 100 and an insulating cover 200. The dry-type transformer coil 100 is provided with a terminal post 110 for fixing and connecting a cable 700. The insulating cover 200 is detachably installed on the dry-type transformer coil 100. The insulating cover 200 and the dry-type transformer coil 100 enclose a terminal groove 310 and a mounting hole 320. The terminal post 110 is located in the terminal groove 310. The mounting hole 320 communicates with the terminal groove 310 and is used for the cable 700 to pass through. The insulating cover 200 is used to cooperate with the dry-type transformer coil 100 to clamp and fix the cable 700.

[0031] In the specific implementation process, the connection between terminal 110 and cable 700 can adopt the existing method. Of course, terminal 110 can also be fixedly connected to cable 700 in other ways. For example, terminal 110 can fix cable 700 by wire clamping bolt 600. The above two connection methods between terminal 110 and cable 700 also have lower installation requirements for cable 700.

[0032] Compared to existing technologies where cable 700 requires precise mating with a T-type plug sleeve, the method of clamping and fixing cable 700 with insulating cap 200 and dry-type transformer coil 100 has lower requirements for cable 700 specifications, dimensions, and quality, lower installation requirements, and wider applicability. Specifically, the mating between insulating cap 200 and dry-type transformer coil 100 provides protective covering at the connection point between terminal 110 and cable 700, while further securing cable 700, making the connection between cable 700 and dry-type transformer coil 100 more reliable and reducing the possibility of poor contact.

[0033] In traditional dry-type transformers, the terminals 110 of the transformer coil 100 are directly exposed to the air, and the connection between the terminals 110 and the grounding metal part of the dry-type transformer is entirely insulated by air. The terminals 110 need to be sufficiently tall to ensure adequate insulation distance between them, resulting in a large overall size for the dry-type transformer, with the size increasing with higher voltage levels. The coil wiring structure provided by this invention insulates and seals the connection between the terminals 110 and the cable. This reduces the distance between the terminals 110 and the grounding metal part while ensuring adequate insulation, thereby reducing the overall size of the dry-type transformer, lowering product costs and installation space requirements, and enhancing the market competitiveness of high-voltage dry-type transformers.

[0034] Therefore, when connecting the cable 700, the coil wiring structure provided by this utility model can first be fixedly connected to the cable 700 through the terminal block 110, and then the insulating cover 200 cooperates with the dry-type transformer coil 100 to further clamp and fix the cable 700 and form a cover and protection at the connection between the terminal block 110 and the cable 700. This can reduce the installation requirements of the cable 700, reduce the wiring cost, and make the connection between the dry-type transformer coil 100 and the cable 700 more reliable.

[0035] Reference Figure 1 and Figure 2 According to some embodiments of this utility model, a boss 120 protrudes from the outer periphery of the dry-type transformer coil 100, a terminal block 110 is disposed on the boss 120, and an insulating cover 200 is detachably installed on the boss 120. A sealing structure is provided between the insulating cover 200 and the boss 120. The outer periphery of the dry-type transformer coil 100 is usually circular. The boss 120 provides a flat surface for the installation of the insulating cover 200, making the installation of the insulating cover 200 more convenient. In addition, the boss 120 can also provide a position for the sealing structure.

[0036] Reference Figures 2 to 4According to some embodiments of the present invention, the sealing structure includes a first sealing groove 121 and a first sealing protrusion 210 that cooperate with each other, a second sealing groove 122 and a second sealing protrusion 220 that cooperate with each other, and a third sealing groove 123 and a third sealing protrusion 230 that cooperate with each other. One of the first sealing groove 121 and the first sealing protrusion 210 is disposed on the insulating cover 200 and the other is disposed on the protrusion 120. The first sealing protrusion 210 is embedded in the first sealing groove 121. The first sealing protrusion 210 and the first sealing groove 121 are located in the terminal groove 310 away from the mounting hole. On one side of mounting hole 320, the length of the first sealing groove 121 is along the radial direction of the mounting hole 320. One of the second sealing groove 122 and the second sealing protrusion 220 is disposed on the insulating cover 200, and the other on the protrusion 120. One of the third sealing groove 123 and the third sealing protrusion 230 is disposed on the insulating cover 200, and the other on the protrusion 120. Both the second sealing protrusion 220 and the third sealing protrusion 230 are disposed along the axial direction of the mounting hole 320, and the terminal groove 310 and the mounting hole 320 are both located between the second sealing protrusion 220 and the third sealing protrusion 230. Therefore, through the above-described sealing structure, the sealing performance between the insulating cover 200 and the wiring portion can be improved, and the unevenness between the insulating cover 200 and the wiring portion increases the creepage distance of current on the surfaces of the insulating cover 200 and the wiring portion, thereby improving the insulation capability.

[0037] In some embodiments, the insulating cover 200 can be detachably snapped onto the boss 120 via the aforementioned sealing structure. Of course, in other embodiments, the insulating cover 200 and the boss 120 can also be fixedly connected by bolts, or the insulating cover 200 and the boss 120 can be bonded together with an insulating curing adhesive; when the insulating cover 200 needs to be disassembled, the curing adhesive can be scraped off.

[0038] In the specific implementation process, when the insulating cover 200 and the wiring part cooperate to clamp and fix the cable 700, the cable 700 and the hole wall of the mounting hole 320 are squeezed against each other, which can seal the mounting hole 320 to a certain extent.

[0039] It should be noted that the above-mentioned sealing structure can also adopt other configuration methods. For example, the sealing structure includes an insulating gasket, which is flexible or elastic. The insulating cover 200 and the wiring part enclose each other to form a sealing channel, and the insulating gasket is located in the sealing channel.

[0040] Reference Figure 2 and Figure 3 According to some embodiments of the present invention, the coil wiring structure further includes a sealing member 400, which is used to sleeve the cable 700 and block the entrance of the mounting hole 320. The sealing member 400 further seals the entrance of the mounting hole 320.

[0041] Reference Figure 2 and Figure 3 According to some embodiments of this utility model, the sealing member 400 includes two insulating open gaskets 410. When the two open gaskets 410 are fitted onto the cable 700, the two open gaskets 410 overlap and abut against each other, and the opening directions of the two open gaskets 410 are staggered. With the above arrangement, the open gaskets 410 can be fitted into the cable 700 radially through the openings of the open gaskets 410, making installation simple and quick.

[0042] Reference Figure 1 and Figure 2 According to some embodiments of the present invention, the open gasket 410 is connected to the insulating cover 200 by a flexible insulating strip 510 to prevent the open gasket 410 from falling off and being lost.

[0043] Reference Figure 1 and Figure 2 According to some embodiments of this utility model, the flexible insulating tape 510 is installed on the insulating cover 200 by insulating bolts 520, thus facilitating the installation of the flexible insulating tape 510. Of course, in other embodiments, the flexible insulating tape 510 can also be glued to the insulating cover 200.

[0044] Reference Figure 2 and Figure 3 According to some embodiments of this utility model, the insulating cap 200 and the boss 120 can cooperate to clamp the umbel 710 of the extruded cable 700. In specific implementation, the end of the cable 700 is provided with the umbel 710, making the outer periphery of the end of the cable 700 uneven, so as to increase the creepage distance of the current on the end surface of the cable 700. In addition, each protrusion of the umbel 710 is usually flexible. The insulating cap 200 and the boss 120 can cooperate to clamp the umbel 710 of the extruded cable 700, so that the umbel 710 can effectively close the mounting hole 320, improving the insulation sealing performance. Moreover, the setting of the umbel 710 means that the outer diameter of the main body of the cable 700 is smaller than that of the mounting hole 320, and the outer diameter of the umbel 710 is larger than that of the mounting hole 320, further reducing the requirements for the dimensional accuracy of the cable 700. This makes the installation requirements of the cable 700 lower while improving the insulation sealing performance.

[0045] Reference Figure 2 and Figure 3 According to some embodiments of the present invention, the terminal block 110 fixes the cable 700 by the wire clamping bolt 600, thereby facilitating the installation between the cable 700 and the terminal block 110 and reducing the installation requirements for the cable 700.

[0046] Of course, it is conceivable that in other embodiments, the terminal 110 and the cable 700 can also be connected and fixed in other ways. For example, the terminal 110 is equipped with a stud, a nut is screwed onto the stud, the stud passes through the head of the cable 700, and the nut and the terminal 110 cooperate to clamp and fix the head of the cable 700.

[0047] According to a second aspect embodiment of the present invention, a dry-type transformer includes the coil wiring structure described above. By adopting the above-described coil wiring structure, the installation requirements of the cable 700 can be reduced, and the connection between the dry-type transformer coil 100 and the cable 700 can be made more reliable.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A coil connection structure characterized by comprising: The utility model relates to a kind of dry-type transformer coil and cable fixing structure, including: Dry-type transformer coil (100) is provided with terminal post (110), and terminal post (110) is used to fixedly connect cable (700); Insulating gland (200) is detachably installed in dry-type transformer coil (100), and insulating gland (200) and dry-type transformer coil (100) form terminal slot (310) and mounting hole (320) by enclosing, terminal post (110) is located in terminal slot (310), mounting hole (320) is communicated with terminal slot (310), and mounting hole (320) is used for cable (700) to pass through, and insulating gland (200) is used to cooperate with dry-type transformer coil (100) to hold cable (700) fixedly.

2. The coil connection structure according to claim 1, characterized by The outer periphery of the dry-type transformer coil (100) is provided with a boss (120), and the terminal post (110) is arranged on the boss (120). The insulating gland (200) is detachably installed on the boss (120), and a sealing structure is arranged between the insulating gland (200) and the boss (120).

3. The coil connection structure according to claim 2, characterized by The sealing structure includes a first sealing groove (121) and a first sealing protrusion (210) that cooperate with each other, a second sealing groove (122) and a second sealing protrusion (220) that cooperate with each other, and a third sealing groove (123) and a third sealing protrusion (230) that cooperate with each other. One of the first sealing groove (121) and the first sealing protrusion (210) is arranged on the insulating gland (200), and the other is arranged on the boss (120). The first sealing protrusion (210) is embedded in the first sealing groove (121). The first sealing protrusion (210) and the first sealing groove (121) are located on the side of the terminal slot (310) away from the mounting hole (320). The length of the first sealing groove (121) is along the radial direction of the mounting hole (320). One of the second sealing groove (122) and the second sealing protrusion (220) is arranged on the insulating gland (200), and the other is arranged on the boss (120). One of the third sealing groove (123) and the third sealing protrusion (230) is arranged on the insulating gland (200), and the other is arranged on the boss (120). The second sealing protrusion (220) and the third sealing protrusion (230) are arranged along the axis direction of the mounting hole (320). The terminal slot (310) and the mounting hole (320) are located between the second sealing protrusion (220) and the third sealing protrusion (230).

4. The coil connection structure according to any one of claims 1 to 3, characterized by The utility model includes a sealing member (400), which is used to cover the cable (700) and block the entrance of the mounting hole (320).

5. The coil connection structure according to claim 4, characterized by The sealing member (400) includes two insulating opening gaskets (410). When the two opening gaskets (410) are covered on the cable (700), the two opening gaskets (410) are stacked and abutted.

6. The coil connection structure according to claim 5, characterized by The opening gasket (410) is connected to the insulating gland (200) by a flexible insulating band (510).

7. The coil connection structure according to claim 6, characterized by The flexible insulation band (510) is mounted on the insulation cover (200) by insulation bolts (520).

8. The coil connection structure according to claim 2, characterized by The insulation cover (200) and the boss (120) can cooperate to clamp the umbrella skirt (710) of the extruded cable (700).

9. The coil connection structure according to claim 1, characterized by The terminal post (110) fixes the cable (700) by the wire pressing bolt (600).

10. Dry-type transformer, characterized in that A coil connection structure comprising a coil connection structure according to any one of claims 1 to 9.

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