Structure for preventing operation short circuit of secondary side of electric furnace transformer

Abstract

A structure for preventing operation short circuit of a secondary side of an electric furnace transformer comprises wire inlet end bus copper bars and wire outlet end bus copper bars, the wire inlet end bus copper bars and the wire outlet end bus copper bars are sequentially and alternately arranged, and the wire inlet end bus copper bars and the wire outlet end bus copper bars are connected with coil outlet heads of a secondary side winding through wiring terminals. The wire inlet end bus copper bar and the wire outlet end bus copper bar are both connected with the water-cooling terminal connecting plate through soft copper strips, and an insulating plate is fixedly arranged at the position, located at the uniform horizontal height with the soft copper strip on the opposite side, of the bus copper bar so that insulation can be kept between the bus copper bar and the adjacent bus copper bar when the soft copper strip is distorted and deformed due to a magnetic field in the running process of the soft copper strip. And the insulating plate does not cover the outer surface of the copper busbar in a large range, so that the influence of the arrangement of the insulating plate on heat dissipation is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a structure for preventing short - circuit of the secondary side of an electric furnace transformer during operation. Background Technique

[0002] Electric furnace transformers are widely used in industries such as metallurgy, machinery, and electronics. They are devices used to control the heating of industrial electric furnaces. As the capacity of electric furnace transformers increases, the current passing through the lead wires of their secondary side windings continuously increases, and the secondary - side current of electric furnace transformers usually reaches more than 50,000 amperes.

[0003] On the secondary side of existing circuit transformers, in order to reduce magnetic leakage loss, the busbar and flexible copper strip generally need to be arranged alternately at the inlet and outlet ends. At the same time, the iron core and the body are tightly arranged, resulting in low utilization rate of the internal space of the oil tank, small space available for internal lead wire operation of the transformer, complex lead wire structure and large volume. It is often necessary to reduce the distance between the flexible copper strip and the busbar, generally requiring the distance ≤ 100 mm. After the inlet and outlet ends are energized during operation, a suction force is generated under the action of electrodynamic force, and the distance between the flexible copper strip and the busbar will be further reduced, thus serious accidents such as discharge and short - circuit will occur.

[0004] To solve the problem of secondary - side short - circuit, the traditional method is to cast the busbar with insulating materials such as resin to form an insulating layer on the outer surface of the busbar. However, this method requires processing at the connection of the busbar to avoid forming an insulating layer on the surface of the connection, which affects the connection between the busbar and the flexible copper strip. The processing and preparation of the busbar are difficult, the use cost is high, and the formed insulating layer on the surface is extremely likely to affect heat dissipation. Content of the Utility Model

[0005] To solve the technical problems of the existing methods for preventing short - circuit of the secondary side of circuit transformers in the above - mentioned background technique, which are difficult to process, high in use cost and affect heat dissipation, the utility model provides a structure for preventing short - circuit of the secondary side of an electric furnace transformer during operation.

[0006] The technical solution of the utility model is as follows:

[0007] The utility model provides a structure for preventing short - circuit in the secondary side operation of an electric furnace transformer, including: an incoming - line end busbar and an outgoing - line end busbar. The incoming - line end busbar and the outgoing - line end busbar are arranged alternately in sequence. Both the incoming - line end busbar and the outgoing - line end busbar are connected to the coil leads of the secondary - side winding through terminal blocks. Both the incoming - line end busbar and the outgoing - line end busbar are connected to a water - cooled terminal connecting plate through flexible copper strips. At the position where the flexible copper strip on the busbar is at the same horizontal height as its opposite - side flexible copper strip, an insulating plate is fixedly arranged to keep insulation between the adjacent busbars when the flexible copper strip is distorted and deformed due to the magnetic field during operation, preventing short - circuit in the secondary side operation. The insulating plate does not cover a large area of the outer surface of the busbar, effectively reducing the influence of the setting of the insulating plate on heat dissipation.

[0008] Preferably, each incoming - line end busbar and an adjacent outgoing - line end busbar form a group. The flexible copper strips on the incoming - line end busbar and the outgoing - line end busbar of the same group are arranged staggeredly up and down to reduce leakage magnetic loss.

[0009] Preferably, the insulating plates on the incoming - line end busbar and the outgoing - line end busbar of the same group are arranged staggeredly up and down to effectively isolate the contact between the opposite - side flexible copper strip and the adjacent busbar.

[0010] Preferably, the insulating plates and the flexible copper strips are alternately arranged on the same incoming - line end busbar, and the insulating plates and the flexible copper strips are alternately arranged on the same outgoing - line end busbar, effectively reducing the coverage of the insulating plate on the busbar.

[0011] Preferably, the width of the insulating plate is not less than the width of its opposite - side flexible copper strip, effectively isolating the contact between the flexible copper strip and its opposite - side busbar. In addition, the insulating plate does not cover a large area of the outer surface of the busbar, effectively reducing the influence of the setting of the insulating plate on heat dissipation.

[0012] Preferably, the insulating plate and the corresponding busbar are fixedly connected through an insulating shrinkage tape to ensure the effectiveness of insulation and avoid damage to the busbar.

[0013] It can be seen from the above technical solutions that the advantages of the utility model are as follows:

[0014] 1. At the position where the flexible copper strip on the busbar is at the same horizontal height as its opposite - side flexible copper strip, an insulating plate is fixedly arranged to keep insulation between the adjacent busbars when the flexible copper strip is distorted and deformed due to the magnetic field during operation, preventing short - circuit in the secondary side operation. The insulating plate does not cover a large area of the outer surface of the busbar, effectively reducing the influence of the setting of the insulating plate on heat dissipation.

[0015] 2. The insulating plates and flexible copper strips are alternately arranged on the same incoming line busbar, and the insulating plates and flexible copper strips are alternately arranged on the same outgoing line busbar, effectively reducing the coverage of the insulating plates on the busbar.

[0016] 3. The width of the insulating plate is not less than the width of the flexible copper strip on its opposite side, effectively isolating the contact between the flexible copper strip and the busbar on its opposite side. In addition, the insulating plate does not cover a large area of the outer surface of the busbar, effectively reducing the impact of the installation of the insulating plate on heat dissipation.

[0017] 4. The insulating plate and the corresponding busbar are fixedly connected through an insulating shrink tape to ensure the effectiveness of insulation and avoid damage to the busbar. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a front view structural schematic diagram of the incoming and outgoing line busbars and flexible copper strips arranged alternately according to one or more embodiments of the present invention;

[0020] Figure 2 It is a top view structural schematic diagram of the structure for preventing short - circuit operation of the secondary side of a circuit transformer according to one or more embodiments of the present invention;

[0021] Figure 3 It is Figure 2 a partial enlarged structural schematic diagram in the K direction of the shown structure;

[0022] Figure 4 It is Figure 2 a partial enlarged structural schematic diagram in the P direction of the shown structure;

[0023] The components represented by the reference numerals in the drawings are:

[0024] 1. Wiring terminal; 2. Incoming line busbar; 3. Outgoing line busbar; 4. Flexible copper strip; 5. Water - cooled terminal connecting plate; 6. Insulating plate. Detailed Embodiments

[0025] In order to make the objectives, features, and advantages of the present utility model more obvious and understandable, the technical solutions in the present utility model will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this patent.

[0026] In a typical embodiment of the present utility model, as Figures 1 - 4 shown, a structure for preventing short - circuit in the secondary side operation of an electric furnace transformer is proposed, including: an incoming - line end busbar 2 and an outgoing - line end busbar 3. The incoming - line end busbar 2 and the outgoing - line end busbar 3 are alternately arranged in sequence. Both the incoming - line end busbar 2 and the outgoing - line end busbar 3 are connected to the coil leads of the secondary - side winding through terminal blocks 1.

[0027] As Figure 1 、 Figure 2 shown, each incoming - line end busbar 2 and an adjacent outgoing - line end busbar 3 form a group. The incoming - line end busbar 2 and the outgoing - line end busbar 3 in the same group are both connected to a water - cooled terminal connecting plate 5 through flexible copper strips 4.

[0028] Among them, the flexible copper strips 4 on the incoming - line end busbar 2 and the flexible copper strips 4 on the outgoing - line end busbar 3 in the same group are arranged vertically staggered to reduce leakage magnetic losses.

[0029] As Figure 3 、 Figure 4 shown, on the adjacent busbars of the flexible copper strip 4 (incoming - line end busbar 2 or outgoing - line end busbar 3), at the position on the busbar opposite to the flexible copper strip 4 on its opposite side (i.e., at the position on the busbar at the same horizontal height as the flexible copper strip 4 on its opposite side), an insulating plate 6 is fixedly provided to maintain insulation between the flexible copper strip 4 and the adjacent busbar during the operation of the flexible copper strip 4 when it is distorted and deformed due to the magnetic field, preventing short - circuit in the secondary side operation.

[0030] Since the flexible copper strips 4 on the incoming - line end busbar 2 and the flexible copper strips 4 on the outgoing - line end busbar 3 in the same group are arranged vertically staggered, and the insulating plate 6 is arranged opposite to the flexible copper strip 4 on the opposite side, therefore, the insulating plates 6 on the incoming - line end busbar 2 and the insulating plates 6 on the outgoing - line end busbar 3 in the same group are also arranged vertically staggered. The insulating plates 6 and the flexible copper strips 4 on the same incoming - line end busbar 2 are alternately arranged. Similarly, the insulating plates 6 and the flexible copper strips 4 on the same outgoing - line end busbar 3 are alternately arranged.

[0031] To ensure the effectiveness of insulation, the width of the insulating plate 6 is not less than the width of the soft copper strip 4 on its opposite side, thus effectively isolating the contact between the soft copper strip 4 and the busbar on its opposite side. In addition, the insulating plate 6 does not cover a large area of the outer surface of the busbar, effectively reducing the impact of the installation of the insulating plate 6 on heat dissipation.

[0032] In this embodiment, the insulating plate 6 is made of insulating paperboard. In other embodiments, the insulating plate 6 can also be made of other insulating materials, and specific details are not limited here.

[0033] The insulating plate 6 is fixedly connected to the corresponding busbar through an insulating shrinkage band to ensure the effectiveness of insulation and avoid damaging the busbar at the same time.

[0034] It can be understood that the thickness of the insulating plate 6 needs to be designed according to the secondary-side current and the electric field strength that the incoming busbar 2, outgoing soft copper strip, outgoing busbar 3, and incoming soft copper strip can withstand. Specific details are not limited here.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A structure for preventing short - circuit in the operation of the secondary side of an electric furnace transformer, comprising: The incoming line end busbar (2) and the outgoing line end busbar (3), characterized in that the incoming line end busbar (2) and the outgoing line end busbar (3) are arranged alternately in sequence, both the incoming line end busbar (2) and the outgoing line end busbar (3) are connected to the coil leads of the secondary side winding through the terminal blocks (1), both the incoming line end busbar (2) and the outgoing line end busbar (3) are connected to the water-cooled terminal connection plate (5) through the flexible copper strips (4), and insulating plates (6) are fixedly arranged at positions on the busbar at the same horizontal height as the flexible copper strip (4) on its opposite side.

2. The structure for preventing short circuit in the operation of the secondary side of an electric furnace transformer according to claim 1, characterized in that, Each incoming line end busbar (2) and an adjacent outgoing line end busbar (3) form a group, and the flexible copper strips (4) on the incoming line end busbar (2) and the outgoing line end busbar (3) of the same group are arranged vertically staggered.

3. The structure for preventing short circuit in the secondary side operation of an electric furnace transformer according to claim 2, characterized in that, The insulating plates (6) on the incoming line end busbar (2) and the outgoing line end busbar (3) of the same group are arranged vertically staggered.

4. A structure for preventing short - circuit in the secondary side operation of an electric furnace transformer according to claim 3, characterized in that, The insulating plates (6) and the flexible copper strips (4) are arranged alternately on the same incoming line end busbar (2), and the insulating plates (6) and the flexible copper strips (4) are arranged alternately on the same outgoing line end busbar (3).

5. A structure for preventing short - circuit operation on the secondary side of an electric furnace transformer according to claim 1, characterized in that, The width of the insulating plate (6) is not less than the width of the flexible copper strip (4) on its opposite side.

6. The structure for preventing short circuit in the operation of the secondary side of an electric furnace transformer according to claim 1, characterized in that, The insulating plate (6) is fixedly connected to the corresponding busbar through an insulating shrinkage band.

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