High-voltage tapping structure for dry-type distribution transformer

Abstract

The utility model belongs to the technical field of transformers, and particularly relates to a high-voltage tapping structure for a dry-type distribution transformer, which comprises a tapping panel fixedly connected to a winding shell of the transformer and wiring insulators, mounting holes for mounting the wiring insulators are formed in the upper end and the lower end of the tapping panel, and the wiring insulators are arranged in the mounting holes. The wiring insulator is fixedly connected with a lead of a high-voltage coil on the winding, sealing paint is filled between the wiring insulator and the mounting hole, and the wiring insulator of a finished product and the lead of the high-voltage coil on the winding are fixedly connected, serve as head and tail terminals of the high-voltage coil, are embedded into the coil and are molded by casting along with resin. While the head and tail terminals are heightened, the strength of the terminals is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformers, and in particular relates to a high-voltage tapping structure for a dry-type distribution transformer. Background Art

[0002] Dry-type transformers are widely used in locations such as local lighting, high-rise buildings, airports, and CNC machinery at ports. Simply put, a dry-type transformer is one whose core and windings are not immersed in insulating oil. Cooling methods include natural air cooling (AN) and forced air cooling (AF). With natural air cooling, the transformer can operate continuously at rated capacity for extended periods. With forced air cooling, the transformer's output capacity can be increased by 50%. They are suitable for intermittent overload operation or emergency overload operation. However, due to the significant increase in load loss and impedance voltage during overload, which results in uneconomical operation, prolonged continuous overload operation should be avoided.

[0003] The high-voltage tapping start and end of the dry-type distribution transformer need to ensure the creepage distance between the terminals and the tapping area terminals, as well as the creepage distance between the pads and pressure pins at both ends of the coil. The shortcomings and deficiencies in the existing technology: when the voltage is high or the coil height is low, there will be a situation where the safety creepage distance requirements cannot be guaranteed. Generally, the creepage distance is increased by raising the head and tail terminals, or moving the tapping area to the opposite side of the head and tail ends. The former has a limited range of height increase. Excessively high head terminals will lead to insufficient strength, easy to break, and bubbles are likely to appear during casting, resulting in product appearance defects; the latter will increase the complexity of the production process, increase the number of steps, and increase the amount of resin used. Moreover, when the coil height is further reduced, the effective safety creepage distance cannot be guaranteed. For this reason, an improved high-voltage tapping structure for dry-type distribution transformers has been designed. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a high-voltage tapping structure for a dry-type distribution transformer, so as to solve the above-mentioned problems in the background technology.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A high-voltage tapping structure for a dry-type distribution transformer includes a tapping panel, which is fixedly connected to the winding housing of the transformer, and a wiring insulator. The tapping panel has mounting holes at the upper and lower ends for mounting the wiring insulators. The wiring insulator is fixedly connected to the lead of the high-voltage coil on the winding, and the space between the wiring insulator and the mounting hole is filled with sealing paint.

[0007] By adopting the above structural design, the high-voltage tapping structure of the dry-type distribution transformer includes a tapping panel, which is fixedly connected to the winding housing of the transformer, and also includes a wiring insulator. The finished wiring insulator is fixedly connected to the lead of the high-voltage coil on the winding, serving as the head and tail terminals of the high-voltage coil, embedded in the coil, and accompanied by resin casting. This increases the height of the head and tail terminals while ensuring the strength of the terminals.

[0008] Furthermore, the connection insulator is provided with a continuous sawtooth insulator shed along its length direction.

[0009] Furthermore, the insulator shed is a hollow glass fiber reinforced plastic shed, and the insulator shed is made of three-dimensional glass fiber fabric impregnated with epoxy resin.

[0010] By adopting the above structural design, since the insulator on the wiring insulator itself has an umbrella skirt, the creepage distance is greatly increased within a limited range, which can fully meet the creepage distance requirements of voltage levels of 35kV and below.

[0011] Furthermore, it also includes a protection frame, which is fixedly connected to the tap panel, and the wiring insulator is located inside the protection frame.

[0012] Furthermore, a threaded connection hole is provided at the end of the wiring insulator, and the protection frame is in the shape of an "X" and is fixedly connected to the wiring insulator and the tapping panel by bolts.

[0013] Furthermore, the sealing coating is resin or glass glue.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The high-voltage tapping structure of the dry-type distribution transformer includes a tapping panel fixedly connected to the transformer winding housing, and a wiring insulator. The finished wiring insulator is fixedly connected to the lead wire of the high-voltage coil on the winding, serving as the head and tail terminals of the high-voltage coil. The insulator is embedded in the coil and is molded by resin casting, which increases the height of the head and tail terminals while ensuring the strength of the terminals.

[0016] 2. Because the insulator on the wiring insulator itself has an umbrella skirt, the creepage distance is greatly increased within a limited range, which can fully meet the creepage distance requirements of voltage levels of 35kV and below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of an embodiment of a high-voltage tapping structure for a dry-type distribution transformer of the utility model (viewing angle 1);

[0018] Figure 2This is a structural schematic diagram of an embodiment of a high-voltage tapping structure for a dry-type distribution transformer of the utility model (viewpoint 2);

[0019] Figure 3 This is a structural schematic diagram of an embodiment of a high-voltage tapping structure for a dry-type distribution transformer of the utility model (viewing angle three);

[0020] Figure 4 This is a structural schematic diagram of an embodiment of a high-voltage tapping structure for a dry-type distribution transformer of the utility model (viewing angle 4);

[0021] The reference numerals in the drawings of the specification include:

[0022] A branching panel (1), a mounting hole (11), a wiring insulator (2), a threaded connection hole (21), a protection frame (3), a bolt (4), a wiring terminal (5), a sealing coating (6), and a lead wire (7). DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0024] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0025] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] In the description of this utility model, unless otherwise expressly specified or limited, when the term "connection" or the like appears to indicate a connection relationship between components, such term should be understood in a broad sense. 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 internal communication between two components or an interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0027] Example 1:

[0028] like Figure 1-4 As shown, the utility model. Specifically, a high-voltage tapping structure for a dry-type distribution transformer includes a tapping panel 1, which is fixedly connected to the winding housing of the transformer, and also includes a wiring insulator 2. The tapping panel 1 has mounting holes 11 at the upper and lower ends for mounting the wiring insulator 2. The wiring insulator 2 is fixedly connected to the lead 7 of the high-voltage coil on the winding, and a sealing coating 6 is filled between the wiring insulator 2 and the mounting hole 11. By adopting the above structural design, the high-voltage tapping structure of the dry-type distribution transformer includes a tapping panel 1, which is fixedly connected to the winding housing of the transformer, and also includes a wiring insulator 2. The finished wiring insulator 2 is fixedly connected to the lead 7 of the high-voltage coil on the winding, and serves as the head and tail terminals of the high-voltage coil, which are embedded in the coil and accompanied by resin casting molding. While increasing the height of the head and tail terminals, the strength of the terminals is ensured.

[0029] In this embodiment, the terminal insulator 2 is provided with a continuous, serrated insulator shed along its length. The insulator shed is a hollow fiberglass reinforced plastic shed made of three-dimensional fiberglass fabric impregnated with epoxy resin. This structural design, due to the inherent sheds on the terminal insulator 2, significantly increases creepage distance within a limited range, fully meeting creepage distance requirements for voltage levels of 35 kV and below.

[0030] In this embodiment, a protection frame 3 is further included. The protection frame 3 is fixedly connected to the tapping panel 1 , and the wiring insulator 2 is located inside the protection frame 3 .

[0031] In this embodiment, a threaded connection hole 21 is formed at the end of the wiring insulator 2 , and the protection frame 3 is in the shape of a Chinese numeral 5 . The protection frame 3 is fixedly connected to the wiring insulator 2 and the tapping panel 1 by bolts 4 .

[0032] In this embodiment, the sealing coating 6 is resin or glass glue.

[0033] The above are only embodiments of the present invention, and the circuits, electronic components and modules involved are all prior art, which can be fully implemented by those skilled in the art. It is needless to say that the content protected by this application does not involve improvements to software and methods. Common knowledge such as the specific structures and characteristics known in the scheme are not described in detail here. Ordinary technicians in the field are aware of all common technical knowledge in the technical field to which the utility model belongs before the application date or priority date, can obtain all prior art in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the field can improve and implement this scheme based on their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the utility model, several variations and improvements can be made, which should also be regarded as the scope of protection of the utility model. These will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A high-voltage tapping structure for a dry-type distribution transformer, comprising a tapping panel (1), wherein the tapping panel (1) is fixedly connected to a winding housing of the transformer, and is characterized in that: The invention also includes a wiring insulator (2), and mounting holes (11) for mounting the wiring insulator (2) are provided at the upper and lower ends of the panel of the tapping panel (1). The wiring insulator (2) is fixedly connected to the lead wire (7) of the high-voltage coil on the winding, and a sealing coating (6) is filled between the wiring insulator (2) and the mounting hole (11).

2. A high-voltage tapping structure for a dry-type distribution transformer according to claim 1, characterized in that: The connection insulator (2) is provided with a continuous sawtooth insulator shed along its length direction.

3. A high-voltage tapping structure for a dry-type distribution transformer according to claim 2, characterized in that: The insulator shed is a hollow glass fiber reinforced plastic shed, and the insulator shed is made of three-dimensional glass fiber fabric impregnated with epoxy resin.

4. The high-voltage tapping structure for a dry-type distribution transformer according to claim 1, characterized in that: It also includes a protection frame (3), which is fixedly connected to the tapping panel (1), and the wiring insulator (2) is located inside the protection frame (3).

5. A high voltage tapping structure for a dry-type distribution transformer according to claim 4, characterized in that: A threaded connection hole (21) is provided at the end of the wiring insulator (2); the protection frame (3) is in the shape of a letter "X"; the protection frame (3) is fixedly connected to the wiring insulator (2) and the tapping panel (1) via bolts (4).

6. A high-voltage tapping structure for a dry-type distribution transformer according to claim 5, characterized in that: The sealing coating (6) is resin or glass glue.

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