330kV autotransformer neutral point insulation wrapping structure

Abstract

The utility model discloses a 330kV self-coupling transformer neutral point insulation wrapping structure, which relates to an insulation creepage distance in a transformer, is used for a 330kV self-coupling transformer neutral point, and comprises a mutual inductor, a bakelite cylinder is arranged in the mutual inductor, corrugated boards and auxiliary insulators are alternately arranged in the bakelite cylinder, a bushing lead is arranged in the center of the inside of the bakelite cylinder, and the bushing lead is arranged in the middle of the inside of the bakelite cylinder. The upper end and the lower end of the corrugated board and the upper end and the lower end of the auxiliary insulator are provided with crawling paths, and a crawling path is arranged between the bushing lead and the mutual inductor. The insulation performance of the low-cost corrugated board, the insulation material and the bakelite cylinder structure is improved. The corrugated boards and the insulating layers wrap the leads in a staggered manner, so that the creepage distance is increased; and the bakelite cylinder is tightly filled to enhance stability. And the overall stability and reliability are improved by newly added parts. The design solves the insulation problem, simplifies the structure, reduces the size and reduces the cost. And inner and outer double-layer guarantee improves the insulation safety.

Description

Technical Field

[0001] This utility model relates to the internal insulation creepage distance of a transformer, used for the neutral point of a 330kV autotransformer, specifically a neutral point insulation wrapping structure for a 330kV autotransformer. Background Technology

[0002] Currently, the neutral point of the 330kV autotransformer is led out from the bushing in a three-phase common manner. When all three phases in the bushing are equipped with current transformers, there is an insulation problem between the current transformers and the neutral point lead-out line into the bushing. In order to increase the creepage distance, corrugated cardboard and insulating cardboard can be layered at different heights.

[0003] Corrugated cardboard and insulation are low-cost and do not require additional internal cavity dimensions. After wrapping the corrugated cardboard and insulation, fill the bakelite tube of the current transformer and then install the whole unit into the current transformer. The installation method is simple, which not only controls the insulation problem but also solves the problem of fixing the bushing lead wire, thus saving costs. Summary of the Invention

[0004] The purpose of this invention is to provide a 330kV autotransformer neutral point insulation wrapping structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A 300kV autotransformer neutral point insulation wrapping structure includes a current transformer. A bakelite cylinder is disposed inside the current transformer. Corrugated cardboard and insulation are alternately arranged inside the bakelite cylinder. An inlet tube lead is disposed at the center of the inside of the bakelite cylinder. The upper and lower ends of the corrugated cardboard and insulation are staggered. There are crawling paths at the upper and lower ends of the corrugated cardboard and insulation. There is a crawling path from the inlet tube lead to the current transformer.

[0007] In a preferred embodiment, the corrugated cardboard and the insulating wrapping are arranged to fill the bakelite tube, and the corrugated cardboard and the insulating layer are arranged in staggered layers around the lead wire of the inlet sleeve.

[0008] In a preferred embodiment, the outermost layer of the bakelite tube is corrugated cardboard, and the innermost layer of the bakelite tube is insulated.

[0009] In a preferred embodiment, the lead wire of the insert tube is wrapped with an insulating sleeve.

[0010] In a preferred embodiment, the corrugated cardboard and the outer insulating surface are provided with a retaining ring.

[0011] In a preferred embodiment, an insulating support frame is provided between the bakelite cylinder and the current transformer.

[0012] In a preferred embodiment, the height difference between the corrugated cardboard and the insulated end increases the creep path of the bushing lead to the transformer.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. Corrugated cardboard with insulation: Low material cost, no need to increase the internal cavity size, and by wrapping the lead wire in layers of varying heights, the creepage distance can be effectively increased and the insulation performance can be improved.

[0015] 2. Bakelite tube: filled with corrugated cardboard and insulated to form a tight wrapping structure, increasing the overall mechanical strength and stability.

[0016] 3. Insulation support frame: Located between the bakelite cylinder and the current transformer, it supports and fixes the bakelite cylinder to prevent it from moving or deforming during operation.

[0017] 4. Fixing rings: Used to secure the corrugated cardboard and insulation in place, ensuring they do not shift during installation and use.

[0018] 5. Insulating sleeve: Wrapped around the lead wire entering the sleeve, providing additional physical protection against damage.

[0019] 6. Insulation wrapping: This addresses the insulation issue of the current transformer's lead wire into the neutral point bushing.

[0020] 7. Cost savings: The structure is simple, using corrugated cardboard and insulated bakelite tubes combined into one unit, without the need to increase internal dimensions.

[0021] 8. Enhanced Insulation Performance: The innermost layer of insulation is in direct contact with the bushing lead, providing the first line of electrical isolation and effectively preventing current leakage or short circuits. The outer corrugated cardboard layer serves as the second line of defense, further increasing the creepage distance through its unique textured structure. This dual protection enhances the overall insulation safety.

[0022] In summary, by using low-cost corrugated cardboard and insulating materials, along with a bakelite tube structure, highly efficient insulation performance was achieved. The staggered layers of corrugated cardboard and insulating material wrapping around the bushing leads significantly increased the creepage distance; the bakelite tube filling these materials formed a tight wrap, enhancing stability; simultaneously, the newly added insulating support frame, fixing ring, and insulating bushing further strengthened the overall stability and reliability. This not only solved the insulation problem between the transformer and the neutral point bushing leads but also achieved effective cost savings by simplifying the structure and reducing internal cavity size requirements. The innermost insulating layer contacts the bushing leads, providing an electrical isolation barrier; the outer corrugated cardboard layer increases the creepage distance, providing double protection and enhancing insulation safety. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the bakelite tube of this utility model;

[0025] Figure 3 This utility model Figure 2 A magnified structural diagram of part A;

[0026] In the diagram: 1. Current transformer, 2. Bakelite cylinder, 3. Corrugated cardboard, 4. Insulation, 5. Lead wire into bushing, 6. Insulating bushing, 7. Fixing ring, 8. Insulating support frame. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1 , Figure 2 , Figure 3 A neutral point insulation wrapping structure for a 330kV autotransformer includes a current transformer 1, a bakelite cylinder 2 inside the current transformer 1, corrugated cardboard 3 and additional insulation 4 alternately arranged inside the bakelite cylinder 2, an inlet tube lead 5 is arranged at the center of the inside of the bakelite cylinder 2, the upper and lower ends of the corrugated cardboard 3 and the additional insulation 4 are staggered, and there are crawling paths at the upper and lower ends of the corrugated cardboard 3 and the additional insulation 4, and there is a crawling path from the inlet tube lead 5 to the current transformer 1.

[0029] The corrugated cardboard 3 and the insulation 4 are wrapped until the bakelite tube 2 is filled. The corrugated cardboard 3 and the insulation 4 are wrapped around the lead wire 5 of the sleeve in a staggered manner.

[0030] The outermost layer of bakelite tube 2 is corrugated cardboard 3, and the innermost layer of bakelite tube 2 is insulated 4.

[0031] The lead wire 5 is wrapped with an insulating sleeve 6.

[0032] The corrugated cardboard 3 and the insulation 4 are provided with a retaining ring 7 on the outside.

[0033] An insulating support frame 8 is provided between the bakelite cylinder 2 and the current transformer 1.

[0034] The varying heights of the corrugated cardboard 3 and the insulating end 4 increase the creep path of the bushing lead 5 to the transformer 1.

[0035] In this embodiment, the corrugated cardboard 3 and the insulation 4 are tightly wrapped until they fill the entire space of the bakelite cylinder 2, and their stacking is staggered to form an effective protective barrier for the lead wire 5. The bakelite cylinder 2 has the corrugated cardboard 3 as the outermost layer and the insulation 4 as the innermost layer, a double-layer protection strategy that is both economical and efficient. The lead wire 5 is additionally wrapped with an insulating sleeve 6, providing physical reinforcement protection. The application of the fixing ring 7 ensures the stability of the corrugated cardboard 3 and the insulation 4 during installation and use. Finally, the insulating support frame 8 added between the bakelite cylinder 2 and the current transformer 1 effectively prevents the bakelite cylinder from moving or deforming during operation, ensuring the stability of the overall structure.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A 330 kV autotransformer neutral point insulation wrapping structure comprising a transformer (1), characterized in that: The mutual inductor (1) is provided with a bakelite cylinder (2), corrugated paper boards (3) and attached insulations (4) are alternately arranged inside the bakelite cylinder (2), a lead-in sleeve lead (5) is arranged at the inside center position of the bakelite cylinder (2), the upper and lower ends of the corrugated paper boards (3) and the attached insulations (4) are staggered, the upper and lower ends of the corrugated paper boards (3) and the attached insulations (4) have crawling paths, and the lead-in sleeve lead (5) has a crawling path to the mutual inductor (1).

2. The 330 kV autotransformer neutral point insulation binding structure according to claim 1, characterized in that: The corrugated paper boards (3) and the attached insulations (4) are wrapped until the bakelite cylinder (2) is filled, and the corrugated paper boards (3) and the attached insulations (4) are wrapped outside the lead-in sleeve lead (5) in layers with staggered heights.

3. The 330 kV autotransformer neutral point insulation binding structure according to claim 1, characterized in that: The outermost layer of the bakelite cylinder (2) is the corrugated paper board (3), and the innermost layer of the bakelite cylinder (2) is the attached insulation (4).

4. The 330 kV autotransformer neutral point insulation binding structure according to claim 1, characterized in that: The lead-in sleeve lead (5) is wrapped with an insulating sleeve (6) outside.

5. The 330 kV autotransformer neutral point insulation binding structure according to claim 1, characterized in that: The corrugated paper boards (3) and the attached insulations (4) are provided with fixing rings (7) outside.

6. The 330 kV autotransformer neutral point insulation binding structure according to claim 1, characterized in that: An insulating support frame (8) is arranged between the bakelite cylinder (2) and the mutual inductor (1).

7. The 330 kV autotransformer neutral point insulation binding structure according to claim 1, characterized in that: The heights of the ends of the corrugated paper boards (3) and the attached insulations (4) are staggered, so as to increase the crawling path of the lead-in sleeve lead (5) to the mutual inductor (1).

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