CN206040407U - Transformer magnetic leakage control shielding structure - Google Patents

Abstract

A transformer magnetic flux leakage control shielding structure, comprising a clip magnetic shield arranged on the web of a transformer clip, a strip-shaped magnetic shield arranged on the upper part of the main empty passage between two transformer columns, and arranged on the inner wall of the transformer oil tank and the inside of the box cover The shielding structure of the fuel tank and the copper shielding of the tank cover, and the L-shaped copper plate arranged at the edge of the upper and lower joints and connected with the shielding structure of the fuel tank and the copper shielding of the tank cover. The utility model proposes a transformer flux leakage control shielding structure, which can control the flux leakage to the greatest extent, reduce loss, avoid local overheating, and ensure safe operation of the transformer.

Description

A Transformer Flux Leakage Control Shielding Structure

technical field

The utility model relates to the technical field of transformer manufacturing, in particular to a transformer flux leakage control shielding structure.

Background technique

With the rapid development of the power system, UHV and large-capacity transformers are widely used. As the capacity of the transformer increases, the magnetic flux leakage increases significantly. The strong magnetic field leakage causes the local temperature inside the transformer to rise and the loss increases; when the temperature is greater than the expected value, local overheating will occur, which will accelerate the aging of the transformer oil. It begins to decompose; sometimes it will cause problems such as local overheating along the box, which will affect the normal operation of the transformer. Therefore, how to effectively control magnetic flux leakage and ensure the safe operation of transformers has become a problem that transformer factories need to solve.

Contents of the invention

In view of the above problems, the utility model provides a transformer flux leakage control shielding structure.

In order to solve the above problems, the technical solution adopted by the utility model is: a transformer magnetic flux leakage control shielding structure, including a clip magnetic shield arranged on the web of the transformer clip, a Bar-shaped magnetic shielding, the oil tank shielding structure and the copper shielding of the tank cover arranged on the inner wall of the transformer oil tank and the inner side of the tank cover, and the L-shaped copper plate arranged at the edge of the upper and lower joints and connected to the shielding structure of the oil tank and the copper shielding of the box cover.

The clamp magnetic shield is used to shield the clamp to avoid local overheating of the clamp; the strip magnetic shield is used to control the inter-column magnetic flux leakage and avoid the influence of the inter-column magnetic flux leakage on the box wall and box edge. The magnetic flux density at the end of the body is selected; the copper shield of the tank cover can shield the tank cover to avoid local overheating due to magnetic flux leakage; the L-shaped copper plate connected to the shielding structure of the fuel tank and the copper shield of the tank cover is installed at the edge of the upper and lower joints to avoid Fuel tank and tank edge are locally overheated.

The magnetic shield of the clamp is facing the main channel and covers the web area of the clamp except the belt seat, one side is attached to the web of the clamp, and the other side is attached to the core lamination.

An insulator is provided between the magnetic shield of the clamp and the web of the clamp to ensure reliable insulation between the two.

The magnetic shield of the clip is fixed on the web of the clip through fasteners, and the thickness of the magnetic shield can be selected according to the magnetic flux density at the end of the body.

The end of the magnetic shield of the clip is provided with a round copper rod to avoid partial discharge at the sharp corner of the shield end.

The strip-shaped magnetic shield is fixed by pressing blocks buckled up and down, and the pressing block is provided with a notch, and the strip-shaped magnetic shield is snapped into the notch.

The shielding structure of the fuel tank is fixed by a bent plate arranged on the tank wall, including a copper shield arranged on the inner wall of the fuel tank and a magnetic shield arranged on the surface of the copper shield, and the magnetic shield is connected to the web of the clamp through a separate lead-out line .

The magnetic shielding is wrapped from the inside to the outside through paper slots and cardboards, and bound with lay-off glass ribbons to ensure reliable insulation.

Elastic glue sticks are arranged between the L-shaped copper plates, and the elasticity of the glue sticks is used to ensure that the two L-shaped copper plates are in good contact, so as to avoid overheating due to partial concentration of the connecting bolts of the upper and lower sections of the transformer and the edge of the box due to magnetic flux leakage.

The clamp magnetic shield and strip magnetic shield are respectively connected to the web of the clamp through separate lead wires to ensure reliable grounding.

The utility model proposes a transformer flux leakage control shielding structure, which can control the flux leakage to the greatest extent, reduce loss, avoid local overheating, and ensure safe operation of the transformer.

Description of drawings

Figure 1 is a schematic diagram of the transformer flux leakage control structure;

Figure 2 is a schematic diagram of the installation of the clamp magnetic shield;

Fig. 3 is A-A sectional view of Fig. 2;

Figure 4 is a schematic diagram of the installation of a strip magnetic shield;

Fig. 5 is the B-B sectional view of Fig. 4;

Figure 6 is a schematic diagram of the installation of the shielding structure of the fuel tank;

Fig. 7 is the C-C sectional view of Fig. 6;

Figure 8 is a schematic diagram of the installation of copper shielding on the box cover;

Fig. 9 is a D-direction expanded view of Fig. 8;

Figure 10 is a schematic diagram of the installation of an L-shaped copper plate.

Among them, 1. Iron core lamination, 2. Clamp web, 3. Clamp magnetic shield, 4. Transformer column, 5. Main empty channel, 6. Strip magnetic shield, 7. Copper shield, 8. Magnetic shield, 9. Upper clip, 10. Pull belt seat, 11. Round copper rod, 12. Fastener, 13. Insulator, 14. Support plate, 15. Press block, 16. Bending plate, 17. Paper slot, 18 , cardboard, 19, welding hole, 20, box edge, 21, L-shaped copper plate, 22, box cover copper shielding.

detailed description

As shown in Figure 1, a transformer flux leakage control shielding structure includes a clip magnetic shield 3 arranged on the web 2 of the transformer clip, and a strip-shaped magnetic shield arranged on the upper part of the main channel 5 between two transformer columns 4 6. The oil tank shielding structure and the tank cover copper shielding 22 arranged on the inner wall of the transformer oil tank and the inner side of the tank cover, and the L-shaped copper plate 21 connected to the oil tank shielding structure and the tank cover copper shielding 22 on the upper and lower joint tank edges 20, and the clip magnetic The shield 3 and the strip-shaped magnetic shield 6 are respectively connected to the web 2 of the clamp through separate lead wires.

As shown in Figure 2 and Figure 3, the clip magnetic shield 3 is facing the main empty channel 5, and covers the clip web area except the drawstring seat 10, one of the sides fits the clip web 2, and the other Laminated core laminations 1 are attached to the side, an insulating piece is provided between the clamp magnetic shield 3 and the clamp web 2, and is fixed on the clamp web 2 by fasteners 12, and the end of the clamp magnetic shield 3 is provided with Round copper rod 11.

As shown in FIG. 4 and FIG. 5 , the strip-shaped magnetic shield 6 is fixed by pressing blocks 15 buckled up and down, and the pressing blocks 15 are provided with notches, and the strip-shaped magnetic shields 6 are snapped into the notches.

As shown in Figure 6 and Figure 7, the shielding structure of the fuel tank is fixed by the bent plate 16 arranged on the tank wall, including the copper shield 7 arranged on the inner wall of the fuel tank and the magnetic shield 8 arranged on the surface of the copper shield 7, the magnetic shield 8 is connected to the web 2 of the clamp through a separate lead wire, and the magnetic shield 8 is wrapped through the paper slot 17 and cardboard 18 from the inside to the outside, and is bound by lay-off glass ribbons.

As shown in FIG. 8 and FIG. 9 , the copper shield 22 of the case cover is arranged on the case cover through the welding holes 19 thereon.

As shown in FIG. 10 , elastic glue sticks are arranged between the L-shaped copper plates 21 .

Claims (10)

1. A transformer flux leakage control shielding structure, characterized in that: comprise a clip magnetic shield (3) arranged on the transformer clip web (2), a main empty passage ( 5) The upper strip magnetic shield (6), the oil tank shielding structure and the tank cover copper shield (22) arranged on the inner wall of the transformer oil tank and the inner side of the tank cover, and the oil tank shielding structure and tank Cover the L-shaped copper plate (21) that the copper shield (22) is connected to. 2. A shielding structure for transformer flux leakage control according to claim 1, characterized in that: the clamp magnetic shield (3) is facing the main empty channel (5), and covers and removes the pull belt seat (10) In the area of the clip web other than the clip, one side is attached to the clip web (2), and the other side is attached to the core lamination (1). 3. A shielding structure for transformer flux leakage control according to claim 1 or 2, characterized in that an insulating piece is provided between the clamp magnetic shield (3) and the clamp web (2). 4. A transformer magnetic flux leakage control shielding structure according to claim 1 or 2, characterized in that: the clamp magnetic shield (3) is fixed to the clamp web (2) by fasteners (12) superior. 5. A shielding structure for transformer flux leakage control according to claim 1 or 2, characterized in that: a round copper rod (11) is provided at the end of the clip magnetic shield (3). 6. A transformer flux leakage control shielding structure according to claim 1, characterized in that: the strip-shaped magnetic shield (6) is fixed by pressing blocks (15) buckled up and down, and the pressing blocks (15) A notch is provided on the top, and the strip-shaped magnetic shield (6) is clamped in the notch. 7. A transformer flux leakage control shielding structure according to claim 1, characterized in that: the oil tank shielding structure includes a copper shield (7) arranged on the inner wall of the oil tank and a copper shield (7) arranged on the surface of the copper shield (7). Magnetic shielding (8). 8. A shielding structure for transformer flux leakage control according to claim 7, characterized in that: said magnetic shielding (8) is wrapped by paper slots (17) and cardboard (18) from inside to outside, and is wrapped by a weft-free Glass ribbons for tying. 9. A shielding structure for transformer flux leakage control according to claim 1, characterized in that elastic glue sticks are arranged between the L-shaped copper plates (21). 10. A shielding structure for transformer flux leakage control according to claim 1, characterized in that: the clamp magnetic shield (3) and the strip magnetic shield (6) are respectively connected to the web of the clamp by a separate lead wire (2) Connection.