Coil with concave surface structure for improving shape of surface electrode

Abstract

The utility model discloses a coil with a concave surface structure for improving the shape of a surface electrode, which particularly relates to the field of transformer manufacturing and 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 utility model, a coil form with a wire outgoing from the middle part 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 utility model relates to transformer manufacturing technical field more specifically, the utility model relates to a kind of coil of concave structure improves surface electrode shape. BACKGROUND

[0002] Coil is one of the most important components of transformer, which is the circuit part of transformer; it is also one of the positions with the highest voltage in transformer.

[0003] In addition, in order to increase the space utilization rate and improve the shape of the surface electrode of the coil, the surface of the coil is often in a planar shape. However, due to the large pressure difference between the beginning and the end of the coil, the surface of the coil is not uniform in the initial field strength, which causes uneven distribution of the margin of the main insulation structure at different positions and low space utilization rate. SUMMARY

[0004] The coil provided by the utility model has a concave structure to improve the shape of the surface electrode. The problem to be solved is that the surface of the existing coil is in a planar shape. However, due to the large pressure difference between the beginning and the end of the coil, the surface of the coil is not uniform in the initial field strength, which causes uneven distribution of the margin of the main insulation structure at different positions and low space utilization rate.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a coil with a concave structure to improve the shape of the surface electrode, comprising: a coil, the surface of the coil is in a concave structure, and an inner diameter pad strip is arranged at the central part of the coil;

[0006] The highest potential part of the coil is at the central part of the coil, and the inner diameter pad strip gradually decreases from the middle part of the coil to the end part of the coil to form a concave structure of the coil electrode. The higher the potential is, the more the position is at the bottom of the concave surface. The lower the potential is, the more the position is at the top of the concave surface.

[0007] In a preferred embodiment, the insulation distance between the coil and other electrodes is two-thirds of L.

[0008] The utility model has the advantages of:

[0009] The utility model adopts a coil with a wire outlet at the middle part. The specific electric field intensity distribution is obtained through electric field calculation, and then the electric field margin is calculated for different positions. Different insulation distances are given according to the different electric field margins of different potential distributions of the coil, so that the shape of the coil surface tends to be concave, the insulation margin is increased, and the space utilization rate is increased. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 It is a schematic diagram of the original planar coil.

[0011] Fig. 2The utility model discloses a concave coil structure schematic diagram.

[0012] The figure mark is: 1, coil, 2, inner diameter pad strip. PREFERRED EMBODIMENT

[0013] It is necessary to point out that the following embodiment is only used to further illustrate the application and can not be understood as limiting the scope of the application, and the skilled in the art can make some non-essential improvements and adjustments to the application according to the above application content.

[0014] Refer to the description attached Figs. 1-2 A coil with a concave structure to improve the shape of the surface electrode, comprising: coil 1, the surface of coil 1 is a concave structure, and an inner diameter pad strip 2 is arranged at the central part of coil 1; the inner diameter pad strip 2 is in the shape of a cuboid, and the concave surface of the concave structure of the coil 1 is a non-smooth concave surface

[0015] The highest potential part of coil 1 is at the central part of the coil, and the inner diameter pad strip 2 gradually decreases from the middle part of coil 1 to the end part of coil 1 to form the concave structure of the electrode of coil 1, and the higher the potential position is, the more it is at the bottom of the concave surface, and the lower the potential position is, the more it is at the top of the concave surface.

[0016] It should be noted that by designing the surface of coil 1 as 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, which can make the electric field distribution on the surface of coil 1 more uniform, reduce the concentration effect of the electric field, and improve the surface field strength distribution to help reduce the peak value of the electric field strength, so that the surface electric field strength of coil 1 is reduced by about 15%, and the risk of arc discharge and breakdown caused by electric field concentration is reduced.

[0017] It should be further noted that by setting different insulation distances for positions with different potentials, i.e. 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 coil 1 and the surrounding environment can be increased, the insulation margin can be increased by about 10%, the insulation margin is improved, the larger insulation distance can reduce the risk of arc breakdown and insulation failure, and the reliability and safety of coil 1 are improved.

[0018] In addition, it should be further noted that by adopting the pie-type coil 1 and the coil 1 with the middle outgoing line, the internal space of the transformer can be effectively utilized, the coil 1 presents a concave structure, the space occupied by the coil 1 itself is relatively small, and therefore more available space is provided inside the transformer, which helps to design a more compact and efficient transformer structure and improve the power density and overall performance of the transformer.

[0019] Further, the insulation distance between coil 1 and other electrodes is two-thirds L.

[0020] It should be noted that L is the main insulation distance between the original coil and other electrodes, which is the existing distance or the preset distance during the test of the embodiment, and the length of the distance can be selected in the range described in the prior art; the surface of the coil 1 is designed as a concave structure, the potential at the bottom of the concave surface is higher, and the potential at the top of the concave surface is lower, the main insulation distance can be mainly placed at the bottom of the concave surface, and the insulation distance at the top of the concave surface can be relatively small, the utilization rate of the insulation material can be improved under the premise of guaranteeing the insulation requirement.

[0021] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. A concave structure improved surface electrode shape coil, characterized by, The utility model relates to a kind of coil electrode, including: Coil (1), the surface of coil (1) is concave structure, and the central part of coil (1) is provided with inner diameter pad strip (2); The highest potential part of the coil (1) is in the central part of coil, and the inner diameter pad strip (2) of the middle part of the coil (1) to the end of the coil (1) is sequentially decreased, to form the concave structure of the electrode of the coil (1), the position of higher potential is more in the bottom of concave surface, the position of lower potential is more in the top of concave surface.

2. A concave structure improved surface electrode shape coil according to claim 1, characterized by: The insulation distance between the coil (1) and other electrodes is two-thirds L.

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