Electrostatic ring special for closed wound core transformer

Abstract

The electrostatic ring special for the closed wound core transformer comprises a first ring chip and a second ring chip, steps are formed at the end of the first ring chip and the end of the second ring chip, and the adjacent steps are in lap joint in a matched mode and connected through rivets. The first ring chip and the second ring chip are connected to form an electrostatic ring core body, the electrostatic ring core body is sequentially provided with a connecting wire, a shielding belt and heat-resistant crepe paper, the problem that an existing closed-ring-shaped ring core is not suitable for a closed wound core transformer is solved, the split type electrostatic ring core body is designed, the structure is simple, the cost is low, and the production efficiency is high. The first ring chip and the second ring chip with steps at the end parts are fixed at the two ends of the closed wound core in a lap joint manner to form the electrostatic ring core body, and meanwhile, the split type electrostatic ring core body can be arranged on a coil winding of the closed wound core, so that the potential distribution of the winding at the end parts is relatively uniform, and the impact insulation strength of the winding is improved; and meanwhile, the electric field distribution at the end part of the coil is also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrostatic rings, in particular to an electrostatic ring specially used for a closed wound core transformer. Background Art

[0002] The core of the conventional electrostatic ring is made into a closed ring, and then the connecting wires are arranged on the ring core, the lead wires are welded, and finally the shielding layer and heat-resistant crepe paper are wrapped. After the conventional electrostatic ring is completed, it is a whole closed ring structure. For stacked core or open wound core transformers, since the silicon steel sheet of the iron yoke on the core has not been inserted before the electrostatic ring is installed, the core window is open, and the electrostatic ring can be placed directly after the coil is pressed.

[0003] For the closed wound core transformer, the core is a closed core made of silicon steel strips, and the upper iron yoke cannot be removed. Obviously, due to the closed core, conventional electrostatic rings are not suitable for this structure. Utility Model Content

[0004] The utility model aims to provide an electrostatic ring specially used for a closed wound core transformer, which is connected by overlapping a split first ring chip and a second ring chip, and the first ring chip and the second ring chip are respectively plugged into the two sides of the wound core, so that the first ring chip and the second ring chip form a closed electrostatic ring, and the electrostatic ring is placed on the coil winding, so that the potential distribution of the end winding is more uniform, the impact insulation strength of the winding is improved, and the electric field distribution at the end of the coil is also improved.

[0005] The utility model provides the following technical solution: an electrostatic ring specially used for a closed-end wound core transformer, comprising a first ring chip and a second ring chip, the ends of the first ring chip and the second ring chip are both formed with steps, and adjacent steps are overlapped and connected by rivets, the first ring chip and the second ring chip are connected to form an electrostatic ring core body, and the electrostatic ring core body is sequentially provided with a connecting wire, a shielding tape and a heat-resistant crepe paper.

[0006] In one embodiment, a first groove is provided on the radial outer surface of the first ring core sheet to form an electrostatic ring with wires extending from the axial outer diameter side, and the lead-out end of the connecting wire extends into the first groove.

[0007] In another embodiment, a second groove is provided on the radial inner wall of the first ring core sheet to form an electrostatic ring with wires extending from the axial inner diameter side, and the lead-out end of the connecting wire extends into the second groove.

[0008] In order to fix the lead-out end of the connecting wire, the lead-out end of the connecting wire is wrapped with heat-resistant crepe paper, and a shrinkable polyester tube is tied tightly on the first groove to tighten the lead-out end of the connecting wire in the first groove.

[0009] The lead-out end of the connecting wire is wrapped with heat-resistant crepe paper, and a shrinkable polyester tube is tied tightly on the second groove to tighten the lead-out end of the connecting wire in the second groove.

[0010] In order to position the shielding tape, a thinned end is formed in the middle of the second ring core sheet, and the shielding tape is wrapped starting from the thinned end.

[0011] Compared with the prior art, the beneficial effect achieved by the utility model is as follows: by setting the first ring chip and the second ring chip, the steps formed at the end are overlapped to form a closed electrostatic ring core, and the electrostatic ring core is a split type, which enables the first ring chip and the second ring chip to be respectively inserted on both sides of the iron core and connected on the coil. The electrostatic ring makes the potential distribution of the end winding more uniform, improves the impact insulation strength of the winding, and also improves the electric field distribution at the end of the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0013] Figure 1 It is a schematic diagram of the structure of the first ring chip and the second ring chip of the utility model;

[0014] Figure 2 This is a schematic diagram of the connection structure between the first ring chip and the second ring chip of the utility model;

[0015] Figure 3 It is a schematic diagram of the winding structure of the electrostatic ring core of the utility model;

[0016] Figure 4 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 5 The utility model Figure 4 A partial enlarged schematic diagram of the middle A area;

[0018] Figure 6 This is a structural diagram of the coil axial outer diameter side wire outlet of the utility model;

[0019] Figure 7 This is a structural diagram of the coil axial inner diameter side wire outlet of the second embodiment of the utility model;

[0020] Figure 8 This is a structural diagram of the radially extending wires of the coil of the third embodiment of the present utility model;

[0021] In the figure: 1, first ring chip; 11, first groove; 12, second groove; 2, second ring chip; 21, thinned end; 3, step; 4, rivet; 5, connecting wire; 6, shielding tape; 7, heat-resistant crepe paper; 8, lead-out end; 9, shrink polyester tube. DETAILED DESCRIPTION

[0022] 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.

[0023] Embodiment 1

[0024] See also Figure 1 and Figure 2 The utility model provides a technical solution: an electrostatic ring specially used for a closed wound core transformer, comprising a first ring chip 1 and a second ring chip 2, the first ring chip 1 and the second ring chip 2 are laminated paper formed by lathe processing, the ends of the first ring chip 1 and the second ring chip 2 are both formed with steps 3, and one step of the adjacent steps 3 is facing upward and the other step is facing downward, which can cooperate with each other to overlap and then connect the first ring chip 1 and the second ring chip 2 together through rivets 4, the first ring chip 1 and the second ring chip 2 are connected to form an electrostatic ring core body, the first ring chip 1 and the second ring chip 2 can be respectively located on both sides of the wound core, and the two are connected together by rivets, the first ring chip 1 and the second ring chip 2 are connected and passed through the wound core to be arranged on the coil, so that the end winding potential distribution is more uniform, the impact insulation strength of the winding is improved, and the electric field distribution at the end of the coil is also improved, and the electrostatic ring core body is sequentially provided with a connecting wire 5, a shielding tape 6 and a heat-resistant crepe paper 7.

[0025] like Figure 3 , 4 As shown in Figure 6, a first groove 11 is provided on the radial outer surface of the first ring chip 1 to form an electrostatic ring with the wire exiting on the axial outer diameter side. The lead-out end 8 of the connecting wire 5 extends into the first groove 11. The first groove 11 is used to embed the lead-out end 8 of the connecting wire 5 to position the lead-out end 8. In the electrostatic ring with the wire exiting on the axial outer diameter side, the connecting wire 5 is wound around the outer circumference of the electrostatic ring core.

[0026] like Figure 4 and 5 As shown, the lead-out end 8 of the connecting wire 5 is wrapped with heat-resistant crepe paper 7, and a shrinkable polyester tube 9 is tied tightly on the first groove 11. The lead-out end 8 of the connecting wire 5 is tightened in the first groove 11, and the lead-out end 8 is shrunk and positioned by shrinking the polyester tube 9.

[0027] A thinned end 21 is formed in the middle of the second ring core sheet 2 , and the shielding tape 6 is wrapped around the thinned end 21 to position the end of the shielding tape 6 to prevent it from sliding on the second ring core sheet 2 .

[0028] Embodiment 2

[0029] like Figure 7 As shown, other structures are the same as those in Example 1, except that a second groove 12 is provided on the radial inner wall of the first ring chip 1 to form an electrostatic ring with the wire exiting from the axial inner diameter side, and the lead end 8 of the connecting wire 5 extends into the second groove 12. In the electrostatic ring with the wire exiting from the axial inner diameter side, the connecting wire 5 is arranged in a circle along the inner circumference of the electrostatic ring core.

[0030] The lead-out end 8 of the connecting wire 5 is wrapped with heat-resistant crepe paper 7 , and a shrinkable polyester tube 9 is fastened on the second groove 12 , so that the lead-out end 8 of the connecting wire 5 is tightened in the second groove 12 .

[0031] Embodiment 3

[0032] like Figure 8 As shown, other structures are the same as those of the first embodiment, except that no grooves are provided on the first ring chip 1, and the electrostatic ring core of this structure is a coil radially extending wire.

[0033] Due to the small operating space of the transformer body, before the electrostatic ring is placed, a part of the shielding tape and heat-resistant corrugated paper should be pre-wrapped on the electrostatic ring core to minimize the difficulty of wrapping the shielding tape and heat-resistant corrugated paper after the electrostatic ring is installed on the body.

[0034] like Figure 3 As shown, the electrostatic ring pre-packaging process is as follows:

[0035] S1. Assemble the first ring chip and the second ring chip, and check the flatness of the overlap and the concentricity of the two ring chips;

[0036] S2. When the electrostatic ring leads are on the inside, arrange the connecting wire along the inner circumference of the ring core; when the electrostatic ring leads are on the outside, arrange the connecting wire along the outer circumference of the ring core and stop at the overlap of the core. The connecting wire should not be disconnected, and a length sufficient to complete a circle of the ring core should be reserved.

[0037] S3. Start wrapping the shielding tape from the thinned end of the middle of the second ring chip and stop wrapping at the overlap of the ring core. Do not disconnect the shielding tape and leave enough length to wrap the entire ring core.

[0038] S4. Wrap the heat-resistant crepe paper on the outside of the shielding tape. The thickness of the wrapping paper shall be in accordance with the requirements of the drawing. Wrap to the overlapping part of the ring core and leave a slope to prepare for the subsequent wrapping.

[0039] S5. Disconnect the two ring cores, wrap them in plastic film and store them flat in the warehouse.

[0040] The process of installing the electrostatic ring to the transformer is as follows:

[0041] S1. Place the electrostatic ring on the device according to the outlet position of the coil, assemble the ring core, and install the fastening rivets;

[0042] S2. Wrap the connecting wire around the ring core completely, weld the lead wire, and polish the welded part with a file;

[0043] S3, continue to wrap the shielding tape to wrap the entire ring core;

[0044] S4, continue to wrap the heat-resistant crepe paper to wrap the entire ring core to the required thickness;

[0045] S5. The lead wire insulation is wrapped with crepe paper and tied tightly with a shrink polyester tube at the outlet of the electrostatic ring.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An electrostatic ring specially used for a closed wound core transformer, comprising a first ring chip and a second ring chip, characterized in that: The ends of the first ring chip and the second ring chip are both formed with steps, and adjacent steps are overlapped and connected by rivets. The first ring chip and the second ring chip are connected to form an electrostatic ring core body, and the electrostatic ring core body is sequentially provided with connecting wires, shielding tapes and heat-resistant crepe paper.

2. The electrostatic ring specially used for closed wound core transformer according to claim 1, characterized in that: A first groove is provided on the radial outer surface of the first ring core sheet to form an electrostatic ring with the wires extending from the axial outer diameter side, and the lead-out end of the connecting wire extends into the first groove.

3. The electrostatic ring specially used for closed wound core transformer according to claim 1, characterized in that: A second groove is provided on the radial inner wall of the first ring core sheet to form an electrostatic ring with the wire leading out from the axial inner diameter side, and the lead-out end of the connecting wire extends into the second groove.

4. The electrostatic ring specially used for closed wound core transformer according to claim 2, characterized in that: The lead-out end of the connecting wire is wrapped with heat-resistant crepe paper, and a shrinkable polyester tube is tied tightly on the first groove to tighten the lead-out end of the connecting wire in the first groove.

5. The electrostatic ring specially used for closed wound core transformer according to claim 3, characterized in that: The lead-out end of the connecting wire is wrapped with heat-resistant crepe paper, and a shrinkable polyester tube is tied tightly on the second groove to tighten the lead-out end of the connecting wire in the second groove.

6. The electrostatic ring specially used for closed wound core transformer according to claim 1, characterized in that: A thinned end is formed in the middle of the second ring core sheet, and the shielding tape is wrapped around the thinned end.

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