Shielding plate and processing method thereof

Abstract

The present application relates to a kind of shielding plate and its processing method, the effect is to improve the electric field inside transformer, belong to transformer technical field.The technical scheme is: the core (11) is placed into paperboard core placement slot, after the bottom (7), core (11), cover (9) are assembled together, multiple binding holes (10) are evenly punched in the position of four peripheral edges, and the rope is sequentially threaded through the binding hole (10) to be bound, the bottom, core and cover after assembly are bent as a whole, and are shallowly bent to U type, and the shielding plate is completed.The beneficial effects of the present application are: the shielding plate is arranged between upper iron yoke lower part and winding, can effectively uniform electric field, reduce loss.

Description

Technical Field

[0001] This invention relates to a shielding plate and its processing method, which is used to improve the internal electric field of a transformer and belongs to the field of transformer technology. Background Technology

[0002] In transformers, shielding plates are used on the outside of the core, on the upper part of the lower yoke, on the lower part of the lower yoke, or on the outside of the magnetic shield of the oil tank. They serve to shield the sharp corners of the core and prevent sharp-corner discharge. These shielding plates are generally large, with length and width ranging from two to four meters depending on the voltage level of the transformer.

[0003] There is a voltage difference between the lower part of the upper yoke in the core of the converter transformer and the end of the coil winding. Long-term operation will increase transformer losses and reduce the life of insulation components. Due to the special nature of this location, a special shielding plate with a different structure from the traditional shielding plate is required. This shielding plate can uniformly distribute the electric field and reduce losses. Summary of the Invention

[0004] The purpose of this invention is to provide a shielding plate and its processing method, which is placed between the lower part of the upper yoke and the winding, and can effectively uniformize the electric field, reduce losses, and solve the problems existing in the background technology.

[0005] The technical solution of this invention is:

[0006] A method for processing a shielding plate, characterized in that the shielding plate being processed consists of three parts: a base, a core, and a cover, and includes the following steps:

[0007] ① Lay double-sided adhesive paper on both sides of the cardboard core. First, wrap two layers of cable paper strips around the edges of the cardboard core. Then, stick semi-conductive paper on the outside of the double-sided adhesive paper. The semi-conductive paper completely wraps the cardboard core and the cable paper strips. After hot pressing, lay copper strip on the semi-conductive paper and fix it with hot adhesive tape. Lead out the end of the copper strip and connect it to the lead wire. The core is now complete.

[0008] ② The bottom is made of cardboard, and cardboard strips are glued to the edge of the bottom as a frame, forming a cardboard core placement groove inside the frame;

[0009] ③ The lid is made of cardboard of the same size as the bottom;

[0010] ④ Place the core into the cardboard core placement slot. After assembling the bottom, core, and cover together, punch multiple binding holes evenly around the edges. Use rope to tie the parts through the binding holes one by one. Fold the assembled bottom, core, and cover together into a shallow U-shape. The shielding board is now complete.

[0011] Furthermore, after wrapping a layer of corner rings around the edges of the core made in step ①, it is placed into the cardboard core placement slot. The corner rings can protect the core from damage.

[0012] Furthermore, multiple binding holes are evenly punched at the edges of the bottom, the frame, and the cover.

[0013] A shielding plate structure consists of three parts: a bottom, a core, and a cover. The core includes a cardboard core, adhesive paper, semi-conductive paper, copper strip, cable strips, and leads. The cardboard core is a rectangular cardboard. Double-sided adhesive paper is laid on both the front and back of the cardboard core. Two layers of cable strips are wrapped around the edges of the cardboard core. Semi-conductive paper is glued to the outside of the double-sided adhesive paper. The semi-conductive paper completely wraps the cardboard core and the cable strips. After hot pressing, copper strip is laid on the semi-conductive paper and fixed with hot adhesive tape. The end of the copper strip is led out and connected to the leads.

[0014] The bottom is a rectangular cardboard, and cardboard strips are glued to the edges of the bottom as a frame, with cardboard core placement grooves formed inside the frame;

[0015] The cover is a rectangular cardboard with the same dimensions as the bottom;

[0016] The core is placed in the cardboard core placement groove. After the bottom, core and cover are assembled together, multiple binding holes are evenly provided at the edge. The rope is passed through the binding holes in sequence for binding. The assembled bottom, core and cover are bent into a U-shape.

[0017] Furthermore, the lead wire extends outward from the bottom edge.

[0018] Furthermore, a corner ring is wrapped around the perimeter of the core to protect the cable paper strips at the perimeter of the core.

[0019] The beneficial effects of this invention are: the shielding plate is placed between the lower part of the upper yoke and the winding, which can effectively uniformize the electric field and reduce losses. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the cardboard core structure according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the semiconductive paper structure according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the mounting structure of the cardboard, semi-conductive paper, and copper strip according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the core structure according to an embodiment of the present invention;

[0024] Figure 5 for Figure 4 Schematic diagram of the upper end section of the AA direction core;

[0025] Figure 6 for Figure 4 Schematic diagram of the lower end section of the AA direction core;

[0026] Figure 7 This is a schematic diagram of the bottom structure of an embodiment of the present invention (after the core is placed);

[0027] Figure 8 This is a schematic diagram of the cover structure according to an embodiment of the present invention;

[0028] In the diagram: 1. Cardboard core; 2. Semi-conductive paper; 3. Copper strip; 4. Corner ring; 5. Cable strip; 6. Lead wire; 7. Bottom; 8. Frame; 9. Cover; 10. Binding hole; 11. Core. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] See attached document Figure 1-8 This embodiment provides a method for processing a shielding plate, which is characterized in that the shielding plate being processed consists of three parts: a base 7, a core 11, and a cover 9, and includes the following steps:

[0031] ① Lay double-sided adhesive paper on both sides of the 0.5mm thick cardboard core 1. First, wrap two layers of cable paper strips 5 around the edges of the cardboard core 1. Then, stick semi-conductive paper 2 on the outside of the double-sided adhesive paper. The semi-conductive paper 2 completely wraps the cardboard core 1 and the cable paper strips 5. After hot pressing, lay copper strip 3 on the semi-conductive paper 2 and fix it with hot adhesive tape. Lead out the end of the copper strip 3 and connect it to the lead wire 6. The core is now made. Wrap a corner ring around the edges of the core. The corner ring can protect the core from damage.

[0032] ② The bottom 7 is made of 1.0mm thick cardboard. A 1.0mm thick cardboard strip is glued to the edge of the bottom 7 as a frame 8. The inside of the frame 8 forms a cardboard core placement groove.

[0033] ③ The lid (9) is made of 1.0mm thick cardboard of the same size as the bottom.

[0034] ④ Place the core wrapped with a corner ring into the cardboard core placement slot, cover it with the top cover 9, and after assembling the bottom, core and cover together, make multiple binding holes evenly around the edges. Use cotton rope to tie and fix it by passing through the binding holes one by one. Fold the assembled bottom, core and cover together into a shallow fold to form a U shape. The shielding plate is now complete.

[0035] See attached document Figure 1-8This embodiment provides a shielding plate structure, which is a long and thin strip shape and consists of three parts: a base 7, a core 11, and a cover 9. The core 11 includes a cardboard core 1, adhesive tape and semi-conductive paper 2, copper strip 3, cable strips 5, and lead wires 6. The cardboard core 1 is a rectangular cardboard with a thickness of 0.5mm. Double-sided adhesive tape is laid on both sides of the cardboard core 1. Two layers of cable strips 5 are wrapped around the edges of the cardboard core 1 to make it smooth and ensure the shielding effect. Semi-conductive paper 2 is glued to the outside of the double-sided adhesive tape. The semi-conductive paper 2 completely wraps the cardboard core 1 and the cable strips 5. After hot pressing, copper strip 3 is laid on the semi-conductive paper 2 and fixed with hot adhesive tape. The end of the copper strip 3 is led out and connected to the lead wires 6. A corner ring is wrapped around the edges of the core to protect the cable strips at the edges of the core.

[0036] The bottom 7 is a rectangular cardboard with a thickness of 1.0mm. A strip of cardboard with a thickness of 1.0mm is glued to the edge of the bottom 7 as a frame 8. A cardboard core placement groove is formed inside the frame 8.

[0037] The cover 9 is a rectangular cardboard with a thickness of 1.0 mm and the same size as the bottom.

[0038] The core is placed in the cardboard core placement groove. After the bottom, core and cover are assembled together, multiple binding holes are evenly provided at the edge. The rope is passed through the binding holes in sequence for binding. The assembled bottom, core and cover are bent into a U-shape.

[0039] The lead wire 6 extends outward from the frame 8 of the bottom 7.

[0040] By placing the shielding plate of the present invention between the lower part of the upper yoke and the winding, the internal electric field of the converter transformer can be improved and the electrical stability increased.

Claims

1. A method for processing a shielding plate, characterized in that: The shielding plate being processed consists of three parts: a base (7), a core (11), and a cover (9), and includes the following steps: ① Lay double-sided adhesive paper on the front and back of the cardboard core (1). First, wrap two layers of cable paper strips (5) around the edges of the cardboard core (1). Then, stick semi-conductive paper (2) on the outside of the double-sided adhesive paper. The semi-conductive paper (2) completely wraps the cardboard core (1) and the cable paper strips (5). After hot pressing, lay copper strip (3) on the semi-conductive paper (2) and fix it with hot adhesive tape. Lead out the end of the copper strip (3) and connect it with the lead wire (6). The core is now complete. ②The bottom (7) is made of cardboard. Cardboard strips are glued to the edge of the bottom (7) as a frame (8). A cardboard core placement groove is formed inside the frame (8); ③The lid (9) is a cardboard of the same size as the bottom; ④ Wrap a corner ring (4) around the edges of the completed core and place it in the cardboard core placement slot. Assemble the bottom, core and cover together. Make multiple binding holes (10) evenly on the edges of the bottom (7), the frame (8) and the cover (9). Tie the bottom, core and cover together with rope through the binding holes. Fold the assembled bottom, core and cover into a U-shape. The shielding plate is now complete.

2. A shielding plate structure, characterized in that: It consists of three parts: bottom (7), core (11), and cover (9); The core (11) includes a cardboard core (1), adhesive paper and semi-conductive paper (2), copper strip (3), cable strip (5) and lead wire (6). The cardboard core (1) is a rectangular cardboard. Double-sided adhesive paper is laid on both the front and back of the cardboard core (1). Two layers of cable strip (5) are wrapped around the edges of the cardboard core (1). Semi-conductive paper (2) is pasted on the outside of the double-sided adhesive paper. The semi-conductive paper (2) completely wraps the cardboard core (1) and the cable strip (5). After hot pressing, copper strip (3) is laid on the semi-conductive paper (2) and fixed with hot adhesive tape. The end of the copper strip (3) is led out and connected to the lead wire (6). A corner ring (4) is wrapped around the edges of the core (11). The bottom (7) is a rectangular cardboard, and cardboard strips are glued to the edge of the bottom (7) as a frame (8). A cardboard core placement groove is formed inside the frame (8); the lead wire (6) extends from the frame (8) of the bottom (7) to the outside; The cover (9) is a rectangular cardboard of the same size as the bottom; The core is placed in the cardboard core placement groove. After the bottom, core and cover are assembled together, multiple binding holes are evenly provided at the edge. The rope is passed through the binding holes in sequence for binding. The assembled bottom, core and cover are bent into a U-shape.

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