An electrical connection structure between a pluggable bushing for a transformer and a bushing base

Abstract

The present invention discloses an electrical connection structure between a pluggable bushing and a bushing base for a transformer, which relates to the technical field of transformers. It includes a bushing base end. A cable-passing bushing is installed on the bushing base end, and a connecting copper bar is installed inside the cable-passing bushing. One end of the connecting copper bar is welded to the bushing base end, and a connecting cable is welded to the other end of the connecting copper bar. The other end of the connecting cable extends into the cable-passing bushing and is welded to a conductive rod. In the present invention, a connecting copper bar slightly higher than the bushing base is welded to the bushing base end, and then a connecting cable connecting the upper conductive rod of the cable-passing bushing is welded above the connecting copper bar, realizing the electrical connection structure between the pluggable bushing and the bushing base. Compared with the existing watchband finger contact connection method, it can not only avoid potential safety hazards caused by damage to the watchband fingers during installation, but also has a stronger current-carrying capacity and is applicable to large-capacity transformers.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and specifically to an electrical connection structure between a plug-in type bushing for a transformer and a bushing base. Background Art

[0002] With the development of society, the electricity consumption has increased rapidly, and the load of each substation is getting larger and larger. When accessories such as transformer bushings fail, the repair and replacement time is particularly crucial for the safe and economical operation of the substation. At present, the oil end of the transformer oil-air bushing is directly installed inside the transformer oil tank. When the bushing fails, multiple steps such as draining the oil from the transformer body, replacing the bushing, evacuating, injecting oil, hot oil circulation, and static placement are required, which takes a lot of time (for a 110 kV transformer, the time required is not less than 144 hours). Currently, when the above situation occurs, the oil part of the plug-in type oil-air bushing can be separated from the transformer oil tank through a bushing base, so that the inner cavity of the plug-in type oil-air bushing base of the transformer and the inner cavity of the transformer oil tank form two independent cavities. When replacing a faulty bushing, only the bushing needs to be changed, the inner cavity of the bushing base is refilled with oil, and it is statically placed for a short time, and the transformer can be put back into operation, greatly shortening the time for the transformer to be put back into operation.

[0003] However, the existing electrical connection structure between the plug-in type oil-air bushing and the bushing base is connected through strap finger contacts, and the strap finger contacts have the following disadvantages: 1. When the installation of the bushing is deviated, it is easy to cause damage to the strap finger contacts, resulting in potential safety hazards; 2. The current-carrying capacity of the strap finger contacts is weak and not suitable for large-capacity transformers. Summary of the Invention

[0004] The purpose of the present invention is to provide an electrical connection structure between a plug-in type bushing for a transformer and a bushing base to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An electrical connection structure between a plug-in type bushing for a transformer and a bushing base includes a bushing base end. A cable-passing bushing is installed on the bushing base end. A connecting copper bar is installed inside the cable-passing bushing. One end of the connecting copper bar is welded to the bushing base end, and the other end of the connecting copper bar is welded with a connecting cable. The other end of the connecting cable extends into the cable-passing bushing and is welded with a conductive rod.

[0007] As a further solution of the present invention: A bushing base insulating cylinder that matches is fixedly sleeved on the cable-passing bushing.

[0008] As a further solution of the present invention: A bushing base flange is also fixedly sleeved on the cable-passing bushing.

[0009] As a further solution of the present invention: the connecting copper bar is fixedly connected to the end of the bushing base by phosphor bronze welding.

[0010] As a further solution of the present invention: the connecting cable is fixedly connected to the connecting copper bar by phosphor bronze welding.

[0011] As a further solution of the present invention: the conductive rod is fixedly connected to the connecting cable by phosphor bronze welding.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] In the present invention, a connecting copper bar slightly higher than the bushing base is welded to the end of the bushing base, and then a connecting cable connecting the upper conductive rod of the cable-through bushing is welded above the connecting copper bar, realizing the electrical connection structure between the plug-in bushing and the bushing base. Compared with the existing watchband finger connection method, it can not only avoid potential safety hazards caused by damage to the watchband fingers during installation, but also has stronger current-carrying capacity and is suitable for large-capacity transformers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present invention;

[0015] Figure 2 is a schematic cross-sectional structural diagram of the present invention.

[0016] In the figure: 1. End of the bushing base; 2. Connecting copper bar; 3. Connecting cable; 4. Conductive rod; 5. Cable-through bushing; 6. Insulating cylinder of the bushing base; 7. Flange of the bushing base. DETAILED DESCRIPTION OF THE INVENTION

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] Please refer to Figures 1 - 2 , in the embodiment of the present invention, an electrical connection structure between a plug-in bushing and a bushing base for a transformer includes an end 1 of the bushing base. A cable-through bushing 5 is installed at the end 1 of the bushing base. A connecting copper bar 2 is installed inside the cable-through bushing 5. One end of the connecting copper bar 2 is welded to the end 1 of the bushing base. The connecting copper bar 2 is fixedly connected to the end 1 of the bushing base by phosphor bronze welding. The other end of the connecting copper bar 2 is welded with a connecting cable 3. The connecting cable 3 is fixedly connected to the connecting copper bar 2 by phosphor bronze welding. The other end of the connecting cable 3 extends to the cable-through bushing 5 and is welded with a conductive rod 4. The conductive rod 4 is fixedly connected to the connecting cable 3 by phosphor bronze welding.

[0019] It should be noted that: A connecting copper bar 2 slightly higher than the sleeve base is welded to the end of the sleeve base 1 of this device, and then a connecting cable 3 connecting the upper conductive rod 4 of the cable-through sleeve 5 is welded above the connecting copper bar 2 to achieve the electrical connection structure between the pluggable sleeve and the sleeve base. Compared with the existing strap finger connection method, it can not only avoid potential safety hazards caused by damage to the strap fingers during installation, but also has a stronger current-carrying capacity and is applicable to large-capacity transformers. In this device, the connecting copper bar 2 is fixedly connected to the end of the sleeve base 1 by phosphor bronze welding, and the connecting cable 3 is fixedly connected to the connecting copper bar 2 by phosphor bronze welding. All weldings use phosphor bronze welding, which can make the connection parts fully fused. Therefore, there will be no problems such as overheating of the current-carrying parts or damage to the joints at the connection parts, making it safer to use. Moreover, the manufacturing cost of this device is lower and it is suitable for popularization.

[0020] Reference Figure 1 and Figure 2 As shown, a sleeve base insulating cylinder 6 that matches is fixedly sleeved on the cable-through sleeve 5. By setting the sleeve base insulating cylinder 6, the insulation performance of the device is improved and it is safer to use.

[0021] Reference Figure 1 and Figure 2 As shown, a sleeve base flange 7 is also fixedly sleeved on the cable-through sleeve 5. By setting the sleeve base flange 7, the installation and fixation of the device are facilitated.

Claims

1. A pluggable bushing and bushing base electrical connection structure for a transformer, including a bushing base end (1), characterized in that, A cable-passing bushing (5) is installed at the end of the bushing base (1). A connecting copper bar (2) is installed inside the cable-passing bushing (5). One end of the connecting copper bar (2) is welded to the end of the bushing base (1), and the other end of the connecting copper bar (2) is welded with a connecting cable (3). The other end of the connecting cable (3) extends to the cable-passing bushing (5) and is welded with a conductive rod (4).

2. The electrical connection structure between the pluggable bushing and the bushing base for a transformer according to claim 1, characterized in that, A matching insulating cylinder of the bushing base (6) is fixedly sleeved on the cable-passing bushing (5).

3. A pluggable bushing and bushing base electrical connection structure for a transformer according to claim 1, characterized in that, A flange of the bushing base (7) is also fixedly sleeved on the cable-passing bushing (5).

4. The electrical connection structure between the pluggable bushing and the bushing base for a transformer according to claim 1, characterized in that, The connecting copper bar (2) is fixedly connected to the end of the bushing base (1) by phosphor bronze welding.

5. An electrical connection structure between a pluggable bushing and a bushing base for a transformer according to claim 1, characterized in that, The connecting copper bar (2) is fixedly connected to the connecting cable (3) by phosphor bronze welding.

6. The electrical connection structure between the pluggable bushing and the bushing base for a transformer according to claim 1, characterized in that, The conductive rod (4) is fixedly connected to the connecting cable (3) by phosphor bronze welding.

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