Novel groove structure of electrostatic ring insulation ring of transformer coil

Abstract

The utility model discloses a novel transformer coil static ring insulation ring groove structure, which relates to the transformer field, and comprises an insulation ring main body, the insulation ring main body comprises an insulation ring head and an insulation ring tail, the insulation ring head is provided with a welding groove, the insulation ring head is also provided with a copper brush wire groove, and the insulation ring tail is provided with a copper brush wire groove. According to the novel structure provided by the utility model, the grooving position is arranged at the same height of the circumference, so that grooving on the end face of the non-winding side is avoided. Compared with an original structure, the structure has the advantages that the chamfer on the outer diameter side of the end is guaranteed, compared with the original structure, the chamfer on the outer diameter side is effectively enlarged, the shape of an end electrode of the electrostatic ring is better guaranteed, the electric field distribution of the end of the coil is effectively improved, the initial field intensity of the end of the coil is effectively reduced, and the insulation margin is increased.

Description

Technical Field

[0001] The utility model relates to the field of transformers, in particular to a novel slot structure of an insulating ring of an electrostatic ring of a transformer coil. Background Art

[0002] In power transformers, due to the uneven distribution of electric field near the ends of coil windings, the insulation strength of the winding ends is reduced, which makes discharge more likely and damages the transformer. In order to improve the electric field distribution near the winding end segments, an electrostatic ring is placed at the winding ends. Its function is to make the uneven electric field at the winding ends uniform, so as to improve the insulation strength of the ends.

[0003] For the electrostatic ring with smaller radial direction, the ring glass fiber is used as its skeleton, and the copper braided wire, aluminum foil corrugated paper and insulation layer are wrapped. In order to improve the electrode shape, the copper braided wire will be transformed into copper brush wire at the lead-out part. The equipotential line will be connected to the winding working line as the electrostatic ring lead-out line to ensure that the electrostatic ring potential is the same as the coil end wire potential, which plays a role in improving the electric field at the winding end.

[0004] Due to the different shapes of copper braided wire and copper brush wire, the depth and width of the grooves at the corresponding parts and the transition welding parts of the two wires are also different. In the past, the transformer electrostatic ring insulation ring would start from the non-winding side end face of the electrostatic ring, pass through a transition distance, and then extend downward to a certain height to open a full circle of grooves to place copper braided wire and copper brush wire. In the actual production process in the workshop, because the grooves for placing copper braided wire and copper brush wire are not on the same circumference, the lathe cannot be processed, and manual processing is required within a range of the narrow end. The processing is difficult, the processing accuracy is not easy to guarantee, and the processing time is too long. How to solve this problem has become a new problem faced in the product design process.

[0005] Therefore, it is necessary to propose a new slot structure of the electrostatic ring insulation ring of the transformer coil to solve the above problems. Utility Model Content

[0006] The utility model aims to provide a novel slot structure of an insulating ring of an electrostatic ring of a transformer coil to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new groove structure of an insulating ring of an electrostatic ring of a transformer coil, comprising an insulating ring body, the insulating ring body comprising an insulating ring head and an insulating ring tail, the insulating ring head being provided with a welding groove, the insulating ring head being provided with a copper brush wire groove, the insulating ring head having a long end face of the insulating ring on a side away from the insulating ring tail, the copper brush wire groove being located on a side close to the long end face of the insulating ring, and the welding groove and the copper brush wire groove being internally connected.

[0008] Preferably, a copper braided wire placement groove is provided on the insulating ring tail, and the side of the insulating ring tail away from the copper brush wire groove has a short end face of the insulating ring, one end of the copper braided wire placement groove is connected to the short end face of the insulating ring, and the end of the copper braided wire placement groove away from the short end face of the insulating ring is connected to the welding groove, and the welding groove, copper brush wire groove and copper braided wire placement groove are all located on the same circumferential plane.

[0009] Preferably, the welding groove, the copper brush wire groove, and the copper braided wire placement groove all have an upper wall, a lower wall and a side wall, and the upper wall, the lower wall and the side wall are all arranged to be planes.

[0010] Preferably, the insulating ring body has an insulating ring inclined surface on the side adjacent to the long end face of the insulating ring, the insulating ring body has an insulating ring plane on the side away from the insulating ring inclined surface, and the welding groove, copper brush wire groove, and copper braided wire placement groove are all located on the side of the insulating ring body close to the insulating ring plane.

[0011] Preferably, the depth of the welding groove is 6 mm, the depth of the copper brush wire groove is 10 mm, the depth of the copper braided wire placement groove is 1 mm, and the heights of the welding groove, copper brush wire groove, and copper braided wire placement groove are all equal.

[0012] Technical effects and advantages of the utility model:

[0013] The new structure places the slots at the same height of the circumference, avoiding slots on the non-winding side end surface. The chamfer of the outer diameter side of the end is guaranteed. Compared with the original structure, the chamfer of the outer diameter side is effectively increased, and the shape of the end electrode of the electrostatic ring is better guaranteed, thereby effectively improving the electric field distribution at the coil end, effectively reducing the starting field strength at the coil end, and increasing the insulation margin;

[0014] The shape of the slot is changed from a beveled slot to a straight slot, which reduces the transition part and makes it easier for workshop workers to wrap the aluminum foil corrugated paper. Compared with the old structure, the new structure can reduce the possibility of displacement of the copper braided wire in the height direction of the insulating ring, ensuring good contact between it and the aluminum foil corrugated paper, and ensuring that the outer surface of the skeleton is an equipotential electrical conductor;

[0015] Compared with the traditional structure, the new structure is simpler in design and easier to process materials. While ensuring sufficient mechanical strength and short-circuit resistance of the transformer, it is easier to operate in the workshop, saving processing time to a great extent. According to actual production and manufacturing experience, the time for manufacturing an insulation ring before improvement is about 50 days, while the processing time of the new structure is only about 15 days. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the improved electrostatic ring structure of the utility model.

[0017] Figure 2It is a schematic diagram of the structure of the improved electrostatic ring of the utility model after expansion.

[0018] Figure 3 For this utility model Figure 2 Cross-sectional view at A'-A'.

[0019] Figure 4 For this utility model Figure 1 Cross-sectional view at B'-B' in the middle.

[0020] Figure 5 For this utility model Figure 1 Cross-sectional view at C'-C' in the middle.

[0021] Figure 6 This is a schematic diagram of the structure of the electrostatic ring before improvement of the utility model.

[0022] Figure 7 This is a schematic diagram of the structure of the electrostatic ring before the improvement of the utility model.

[0023] Figure 8 For this utility model Figure 7 Cross-section at AA

[0024] Fig. 9 For this utility model Figure 6 Cross-section at the middle BB

[0025] Fig.10 For this utility model Figure 6 Cross-section at CC

[0026] Fig.11 For this utility model Figure 7 Cross-section at DD

[0027] In the figure: 1. Insulating ring body; 2. Welding groove; 3. Copper brush wire groove; 4. Copper braided wire placement groove; 101. Insulating ring head; 102. Insulating ring tail; 103. Insulating ring inclined surface; 104. Insulating ring plane; 105. Insulating ring long end surface; 106. Insulating ring short end surface. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The utility model provides Figure 1-Figure 11The groove structure of a novel transformer coil electrostatic ring insulating ring shown in the figure comprises an insulating ring body 1, the insulating ring body 1 comprises an insulating ring head 101 and an insulating ring tail 102, a welding groove 2 is provided on the insulating ring head 101, a copper brush wire groove 3 is also provided on the insulating ring head 101, a copper braided wire placement groove 4 is provided on the insulating ring tail 102, the insulating ring head 101 has an insulating ring long end face 105 on the side away from the insulating ring tail 102, the insulating ring tail 102 has an insulating ring short end face 106 on the side away from the copper brush wire groove 3, and the copper brush wire groove 3 is located on the side close to the insulating ring long end face 105 The welding groove 2 and the copper brush wire groove 3 are connected internally. When in use, the insulating ring body 1 is wound around the winding end of the transformer coil, and then the copper braided wire is wound around the copper braided wire placement groove 4, and the copper brush wire is wound around the copper brush wire groove 3. Then the end of the copper braided wire and the end of the copper brush wire are welded inside the welding groove 2. The copper braided wire will transition to the copper brush wire at the lead-out portion, which can improve the shape of the electrode, so that the equipotential line is connected to the winding working line as the electrostatic ring lead-out line to ensure that the electrostatic ring potential is the same as the coil end wire potential, thereby improving the electric field at the winding end.

[0030] One end of the copper braided wire placement groove 4 is connected to the short end face 106 of the insulating ring, and the end of the copper braided wire placement groove 4 away from the short end face 106 of the insulating ring is connected to the welding groove 2. The welding groove 2, the copper brush wire groove 3, and the copper braided wire placement groove 4 are all located on the same circumferential plane. Before the improvement, there is a transition groove between the welding groove 2, the copper brush wire groove 3, and the copper braided wire placement groove 4. Figure 7 As shown, this causes the copper braided wire and the copper brush wire to be not on the same circumferential plane, and thus there is a potential difference between the potential of the electrostatic ring and the potential of the coil end, which will affect the conductive effect. Moreover, the welding groove 2, the copper brush wire groove 3, and the copper braided wire placement groove 4 are located on the same circumferential surface, making it easier to process the electrostatic ring and more efficient to manufacture.

[0031] The welding groove 2, copper brush wire groove 3, and copper braided wire placement groove 4 all have an upper wall, a lower wall, and a side wall, and the upper wall, the lower wall, and the side wall are all set to be planes. Before the improvement, the upper wall and the lower wall of the welding groove 2, the copper brush wire groove 3, and the copper braided wire placement groove 4 are all designed with inclined surfaces. This design makes it easy for the copper braided wire and the copper brush wire to slide after winding, which may cause the coil to deform during use and affect its anti-static effect. Therefore, after the improvement, the upper wall and the lower wall of the welding groove 2, the copper brush wire groove 3, and the copper braided wire placement groove 4 are all set to be planes. This design can reduce the transition part, making it convenient for workshop workers to wind aluminum foil corrugated paper, and compared with the old structure, the new structure can reduce the possibility of displacement of the copper braided wire in the height direction of the insulating ring, ensure good contact between it and the aluminum foil corrugated paper, and ensure that the outer surface of the skeleton is an equipotential conductor.

[0032] The insulating ring body 1 has an insulating ring inclined surface 103 on one side adjacent to the insulating ring long end face 105, and the insulating ring body 1 has an insulating ring plane 104 on the side away from the insulating ring inclined surface 103. The welding groove 2, copper brush wire groove 3, and copper braided wire placement groove 4 are all located on the side of the insulating ring body 1 close to the insulating ring plane 104. The depth of the welding groove 2 is 6 mm, the depth of the copper brush wire groove 3 is 10 mm, and the depth of the copper braided wire placement groove 4 is 1 mm. The heights of the welding groove 2, copper brush wire groove 3, and copper braided wire placement groove 4 are all equal. Because the specifications of the transformer are different, the diameters of the copper braided wire and copper brush wire wound thereon are also different. Using different depths can better cope with wires of various specifications. The insulating ring inclined surface 103 is set as an inclined surface. When the electrostatic ring is installed, the insulating ring inclined surface 103 can better fit the winding end of the transformer coil.

Claims

1. A novel slot structure of an insulating ring of an electrostatic ring of a transformer coil, comprising an insulating ring body (1), characterized in that: The insulating ring body (1) comprises an insulating ring head (101) and an insulating ring tail (102); a welding groove (2) is provided on the insulating ring head (101); a copper brush wire groove (3) is also provided on the insulating ring head (101); a side of the insulating ring head (101) away from the insulating ring tail (102) has an insulating ring long end face (105); the copper brush wire groove (3) is located on a side close to the insulating ring long end face (105); and the welding groove (2) and the copper brush wire groove (3) are internally connected.

2. The slot structure of the novel transformer coil electrostatic ring insulation ring according to claim 1 is characterized in that: The insulating ring tail (102) is provided with a copper braided wire placement groove (4), and the insulating ring tail (102) has an insulating ring short end face (106) on the side away from the copper brush wire groove (3), one end of the copper braided wire placement groove (4) is connected to the insulating ring short end face (106), and the end of the copper braided wire placement groove (4) away from the insulating ring short end face (106) is connected to the welding groove (2), and the welding groove (2), the copper brush wire groove (3) and the copper braided wire placement groove (4) are all located on the same circumferential plane.

3. The groove structure of the new transformer coil electrostatic ring insulation ring according to claim 1 is characterized by: The welding groove (2), the copper brush wire groove (3) and the copper braided wire placement groove (4) all have an upper wall, a lower wall and a side wall, and the upper wall, the lower wall and the side wall are all arranged to be planes.

4. The groove structure of the novel transformer coil electrostatic ring insulation ring according to claim 1 is characterized in that: The insulating ring body (1) has an insulating ring inclined surface (103) on one side adjacent to the insulating ring long end surface (105), the insulating ring body (1) has an insulating ring plane (104) on one side away from the insulating ring inclined surface (103), and the welding groove (2), the copper brush wire groove (3), and the copper braided wire placement groove (4) are all located on the side of the insulating ring body (1) close to the insulating ring plane (104).

5. The groove structure of the new transformer coil electrostatic ring insulation ring according to claim 4 is characterized in that: The depth of the welding groove (2) is 6 mm, the depth of the copper brush wire groove (3) is 10 mm, the depth of the copper braided wire placement groove (4) is 1 mm, and the heights of the welding groove (2), the copper brush wire groove (3) and the copper braided wire placement groove (4) are all equal.

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