Coil with concave surface structure for improving shape of surface electrode

Abstract

The invention discloses a coil with a concave surface structure for improving the shape of a surface electrode, and particularly relates to the field of transformer manufacturing, the coil comprises a coil, the surface of the coil is of a concave surface structure, and an inner diameter filler strip is arranged in the middle of the coil; the highest potential part of the coil is located in the center of the coil, the inner diameter filler strips are sequentially decreased from the middle of the coil to the ends of the coil to form a concave surface structure of the coil electrode, the higher potential part is located at the bottom of the concave surface, and the lower potential part is located at the top of the concave surface. According to the invention, a coil form with a middle outgoing line is adopted, specific electric field intensity distribution is obtained through electric field calculation, then electric field margins are calculated for different positions, and different insulation distances are respectively given for different potential distributions of the coil according to different electric field margins, so that the surface shape of the coil is close to a concave surface shape, and the insulation margins are increased; the space utilization rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer manufacturing, and more particularly to a coil with a concave structure to improve the shape of surface electrodes. Background Art

[0002] The coil is one of the most important components of the transformer and is the circuit part of the transformer; it is also one of the locations with the highest voltage in the transformer.

[0003] In addition, in order to increase space utilization and improve the electrode shape on the coil surface, high-voltage transformers often adopt a planar shape for the coil surface. However, due to the large voltage difference between the beginning and the end of the coil, although the surface is a planar structure, the initial field strength on the surface is not uniform, resulting in uneven margin distribution at different positions of the main insulation structure and low space utilization. Summary of the invention

[0004] The present invention provides a coil with a concave structure to improve the surface electrode shape, and the problem to be solved is: the existing coil surface adopts a planar shape, but due to the large pressure difference between the beginning and the end of the coil, although its surface is a planar structure, its surface initial field strength is not uniform, resulting in uneven margin distribution at different positions of the main insulation structure and low space utilization.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a coil with a concave structure to improve the shape of the surface electrode, comprising: a coil, the surface of the coil is a concave structure, that is, it gradually becomes higher from the middle to the outside, and the concave structure does not penetrate the coil, and the edge of the concave structure does not spread to the edge of the coil, but spreads evenly outward from the center point of the coil.

[0006] In a preferred embodiment, an inner diameter pad is provided in the middle of the coil;

[0007] The highest potential part of the coil is in the middle of the coil, and the inner diameter pads decrease gradually from the middle of the coil to the end of the coil to form a concave structure of the coil electrode. The higher the potential, the lower the potential is at the bottom of the concave surface, and the lower the potential, the higher the potential is at the top of the concave surface.

[0008] In a preferred embodiment, the inner diameter pad is in the shape of a cuboid, and the concave surface of the concave structure of the coil is a non-smooth concave surface.

[0009] In a preferred embodiment, the insulation distance between the coil and the electrode is two-thirds L.

[0010] The beneficial effects of the present invention are:

[0011] The present invention adopts a coil form with a middle outlet, obtains a specific electric field strength distribution through electric field calculation, and then calculates the electric field margin for different positions, and gives different insulation distances for different potential distributions of the coil according to different electric field margins, so that the surface shape of the coil approaches a concave shape, increases the insulation margin, and increases space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the original planar coil.

[0013] Figure 2 It is a schematic diagram of the concave coil structure of the present invention.

[0014] The accompanying drawings are marked as follows: 1, coil; 2, inner diameter pad. DETAILED DESCRIPTION

[0015] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0016] Refer to the instruction manual Figure 1 to Figure 2 , a coil with a concave structure to improve the shape of the surface electrode, comprising: a coil 1, the surface of the coil 1 is a concave structure, and an inner diameter pad 2 is arranged in the middle of the coil 1;

[0017] The highest potential part of coil 1 is in the middle of the coil, and the inner diameter pad 2 decreases gradually from the middle of coil 1 to the end of coil 1 to form a concave structure of the electrode of coil 1. The higher the potential, the closer it is to the bottom of the concave surface, and the lower the potential, the closer it is to the top of the concave surface.

[0018] It should be noted that by designing the surface of the coil 1 into a concave structure, the position with higher potential is at the bottom of the concave surface, and the position with lower potential is at the top of the concave surface, so that the electric field distribution on the surface of the coil 1 can be more uniform, reducing the concentration effect of the electric field. The improved surface field strength distribution helps to reduce the peak value of the electric field strength, so that the electric field strength on the surface of the coil 1 is reduced by about 15%, reducing the risk of arc discharge and breakdown caused by electric field concentration.

[0019] It should also be noted that by setting different insulation distances for positions with different potentials, that is, setting a larger insulation distance at the bottom of the concave surface and a smaller insulation distance at the top of the concave surface, the insulation distance between the surface of the coil 1 and the surrounding environment can be increased, and the insulation margin can be increased by about 10%. By improving the insulation margin, a larger insulation distance can reduce the risk of arc breakdown and insulation failure, and improve the reliability and safety of the coil 1.

[0020] It should also be noted that by adopting a pancake-shaped coil 1 and a coil 1 with a middle outlet, the internal space of the transformer can be effectively utilized. The coil 1 presents a concave structure, so that the space occupied by the coil 1 itself is relatively small, thereby providing more available space inside the transformer, which is helpful to design a more compact and efficient transformer structure and improve the power density and overall performance of the transformer.

[0021] Furthermore, the insulation distance between the coil 1 and other electrodes is two-thirds L.

[0022] It should be noted that L is the main insulation distance between the original coil and the other electrodes, which is the existing distance or the preset distance during the test of this embodiment, and the length of the distance can be selected from the range recorded in the prior art; the surface of the coil 1 is designed to be a concave structure, so that the potential at the bottom of the concave is higher, and the potential at the top of the concave is lower, the main insulation distance can be mainly placed at the bottom of the concave, and the insulation distance at the top of the concave can be relatively small. On the premise of ensuring the insulation requirements, 1 / 3 of the main insulation distance of the coil 1 can be saved, thereby improving the utilization rate of the insulating material.

[0023] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A coil with a concave structure to improve the shape of the surface electrode, characterized in that: include: The coil (1) has a concave surface structure, that is, it gradually becomes higher from the middle to the outside, and the concave structure does not penetrate the coil (1), and the edge of the concave structure does not spread to the edge of the coil, but spreads evenly outward from the center point of the coil (1).

2. A coil with a concave structure to improve the shape of the surface electrode according to claim 1, characterized in that: An inner diameter pad (2) is arranged in the middle of the coil (1); The highest potential position of the coil (1) is located in the middle of the coil, and the inner diameter pad (2) decreases from the middle of the coil (1) to the end of the coil (1) to form a concave structure of the coil (1) electrode, wherein the position with higher potential is located at the bottom of the concave surface, and the position with lower potential is located at the top of the concave surface.

3. A coil with a concave structure to improve the surface electrode shape according to claim 2, characterized in that: The inner diameter pad (2) is in the shape of a rectangular parallelepiped, and the concave surface of the concave surface structure of the coil (1) is a non-smooth concave surface.

4. The coil with a concave structure to improve the surface electrode shape according to claim 1, characterized in that: The insulation distance between the coil (1) and the electrode is two thirds L.

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