Transformer with totally-enclosed incoming and outgoing lines

Abstract

The utility model relates to the technical field of transformers, in particular to a totally-enclosed incoming and outgoing line transformer, which comprises a transformer main body, and a three-phase common box basin-type insulator, a neutral point basin-type insulator and a high-voltage basin-type insulator are adopted on the transformer main body to replace bushings for outgoing lines of a conventional transformer. And the outer ends of the three-phase common box basin-type insulator, the neutral point basin-type insulator and the high-voltage basin-type insulator are respectively provided with a low-voltage transition ascending flanged base, a neutral point transition ascending flanged base and a high-voltage transition ascending flanged base. According to the device, the basin-type insulators are adopted to replace bushings of incoming and outgoing lines of a conventional transformer, and the size of the basin-type insulators is much smaller than that of the bushings of the transformer, so that the basin-type insulators do not need to be disassembled in the transportation process, the field workload is reduced, and various quality problems and hidden dangers occurring in the disassembly and assembly process can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a transformer with fully enclosed input and output lines. Background Art

[0002] A power transformer is a static electrical device used to convert a given AC voltage and current into one or more different voltages and currents at the same frequency. Typically consisting of two or more windings, this device converts the AC voltage and current of one system into the voltage and current of another system at the same frequency through electromagnetic induction to transmit electrical energy. The low-voltage side of the power transformer uses the principle of electromagnetic induction to transmit electrical energy from the high-voltage side to the outside via a low-pressure oil-air bushing, where it is then transmitted via overhead lines to other electrical equipment. However, existing technologies have the following shortcomings: 1. The live parts of the bushing's external wiring terminals are far from the outside world; 2. They are significantly affected by the natural environment, such as rain, snow, and strong winds; 3. They are significantly affected by small animals such as birds, snakes, and rodents; 4. The space for wiring is limited due to factors such as discharge, magnetic flux leakage, and the location of other electrical components; 5. The transformer bushing is large, requiring disassembly during transportation and subsequent assembly on site; 6. The connection between the on-site GIS, GIL, and gas-insulated neutral grounding device and the transformer bushing requires a transition busbar, which increases the overall size of the power plant equipment. Therefore, we propose a fully enclosed transformer with incoming and outgoing lines to address these issues. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a transformer with fully enclosed input and output lines.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A fully enclosed transformer with incoming and outgoing lines includes a transformer main body. The transformer main body uses three-phase common box pot-type insulators, neutral point pot-type insulators and high-voltage pot-type insulators to replace the bushings used for conventional transformer outgoing lines. The outer ends of the three-phase common box pot-type insulators, neutral point pot-type insulators and high-voltage pot-type insulators are respectively provided with a low-voltage transition riser, a neutral point transition riser and a high-voltage transition riser. The transformer main body is made of aluminum alloy material with high strength and good corrosion resistance.

[0006] As a preferred technical solution of the present invention, the three-phase common-box pot-type insulator, neutral point pot-type insulator and high-voltage pot-type insulator are all formed by epoxy resin casting with metal flange rings and central metal inserts.

[0007] As a preferred technical solution of the present invention, the low-voltage transition elevation seat, the neutral point transition elevation seat, and the high-voltage transition elevation seat are directly connected to the GIL, GIS, and the gas-insulated neutral point grounding device.

[0008] As an optimal technical solution of the present invention, the three-phase common-box pot-type insulator, neutral point pot-type insulator and high-voltage pot-type insulator are connected to the transformer leads on the inner sides by bolts, and are movably connected to the GIS, GIL and gas-insulated neutral point grounding device on the outer sides by spring contacts.

[0009] As a preferred technical solution of the present invention, the three-phase common-box pot-type insulator, neutral point pot-type insulator and high-voltage pot-type insulator are used in an environment where the insulating medium is transformer oil and sulfur hexafluoride gas.

[0010] As an optimal technical solution of the present invention, partial discharge monitoring interfaces are provided on the three-phase common-box pot-type insulator, the neutral point pot-type insulator and the high-voltage pot-type insulator, which can monitor the partial discharge information inside the transformer online.

[0011] As an optimal technical solution of the utility model,

[0012] The beneficial effects of the utility model are:

[0013] 1. This device provides a full insulation solution, and the equipment operation is highly safe;

[0014] 2. This device is beneficial to the design of substation outgoing lines. It only needs to meet the mechanical distance to the outside, and has little demand for external space.

[0015] 3. The device is fully enclosed with inlet and outlet lines, so it is not affected by small animals such as birds, snakes, and mice, and is not affected by the natural environment such as rain, snow, and strong winds.

[0016] 4. The size of the pot-type insulator used in this device is consistent with the interface of GIS and GIL, and no transition flange or pipe nut is required when connecting with GIS and GIL;

[0017] 5. This device uses pot-type insulators to replace the bushings of conventional transformer inlets and outlets. The size of the pot-type insulators is much smaller than that of the transformer bushings. They do not need to be removed during transportation, which reduces the workload on site and can also reduce various quality problems and hidden dangers caused by the disassembly and assembly process.

[0018] 6. This device is equipped with a transition riser on the outside of the basin-type insulation. The on-site GIS, GIL and gas-insulated neutral point grounding device pipe mother only need to be connected to the transition riser flange, which is convenient for installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a schematic diagram of the structure of a fully enclosed input and output transformer proposed by the utility model from a top view;

[0020] Figure 2 This is a schematic diagram of the main structure of a fully enclosed input and output transformer proposed by the utility model;

[0021] Figure 3 This is a structural diagram of a three-phase common-box pot-type insulator in a fully enclosed transformer with incoming and outgoing lines proposed by the utility model;

[0022] Figure 4 This is a structural diagram illustrating the connection between the internal leads of the transformer and the pot-type insulator.

[0023] In the figure: 1. Three-phase common box pot-type insulator; 2. Low-voltage transition riser; 3. Neutral point pot-type insulator; 4. Neutral point transition riser; 5. High-voltage pot-type insulator; 6. High-voltage transition riser; 7. Terminal block; 8. Shielding cover. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Reference Figure 1-4 A fully enclosed transformer with incoming and outgoing lines includes a transformer main body. The transformer main body uses three-phase common box pot-type insulator 1, neutral point pot-type insulator 3 and high-voltage pot-type insulator 5 to replace the bushing or cable terminal used for conventional transformer outgoing lines. The three-phase common box pot-type insulator 1, neutral point pot-type insulator 3 and high-voltage pot-type insulator 5 are all formed by epoxy resin casting with metal flange rings and central metal inserts.

[0026] Among them, the three-phase common-box pot-type insulator 1, the neutral point pot-type insulator 3, and the high-voltage pot-type insulator 5 are used in an insulating medium composed of transformer oil and sulfur hexafluoride gas. The three-phase common-box pot-type insulator 1, the neutral point pot-type insulator 3, and the high-voltage pot-type insulator 5 are connected to the transformer leads on the inside with bolts, and are flexibly connected to the GIS, GIL, and gas-insulated neutral-point grounding device on the outside with spring contacts. At the same time, partial discharge monitoring interfaces are provided on the three-phase common-box pot-type insulator 1, the neutral point pot-type insulator 3, and the high-voltage pot-type insulator 5 to enable online monitoring of partial discharge information within the transformer.

[0027] Secondly, the outer ends of the three-phase common-box pot-type insulator 1, the neutral point pot-type insulator 3 and the high-voltage pot-type insulator 5 are respectively provided with a low-voltage transition riser 2, a neutral point transition riser 4 and a high-voltage transition riser 6, which are made of aluminum alloy material with high strength and good corrosion resistance. The low-voltage transition riser 2, the neutral point transition riser 4 and the high-voltage transition riser 6 are directly connected to the GIL, GIS and the gas-insulated neutral point grounding device.

[0028] In this embodiment, a pot-type insulator replaces the conventional transformer inlet and outlet bushings and cable terminals. A transition riser is installed on the outside of the pot-type insulator to avoid removing the pot-type insulator fixing bolts when installing the GIS, GIL, and gas-insulated neutral grounding device on site. The internal leads of the transformer are crimped using cold-pressed pipes. A terminal block 7 is provided on the inside of the pot-type insulator. After crimping, the leads are bolted to the terminal block 7. A shielding cover 8 is installed to protect high electric field areas. Blind bolt holes are reserved on the outer conductor of the pot-type insulator. External equipment such as GIS can be connected using plug-in conductors, and their fixed ends can be directly installed on the outer conductor of the pot-type insulator.

[0029] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fully enclosed inlet and outlet transformer, comprising a transformer body, characterized in that: The transformer body adopts a three-phase common box pot-type insulator (1), a neutral point pot-type insulator (3) and a high-voltage pot-type insulator (5) to replace the bushing for the conventional transformer outlet, and the outer ends of the three-phase common box pot-type insulator (1), the neutral point pot-type insulator (3) and the high-voltage pot-type insulator (5) are respectively provided with a low-voltage transition raising seat (2), a neutral point transition raising seat (4) and a high-voltage transition raising seat (6).

2. A fully enclosed transformer with input and output lines according to claim 1, characterized in that: The three-phase common-box pot-type insulator (1), the neutral point pot-type insulator (3) and the high-voltage pot-type insulator (5) are all formed by epoxy resin casting using a metal flange ring and a central metal insert.

3. A fully enclosed transformer with incoming and outgoing lines according to claim 1, characterized in that: The low-voltage transition raising seat (2), the neutral point transition raising seat (4), and the high-voltage transition raising seat (6) are directly connected to the GIL, the GIS, and the gas-insulated neutral point grounding device.

4. A fully enclosed transformer with incoming and outgoing lines according to claim 3, characterized in that: The three-phase common-box pot-type insulator (1), neutral point pot-type insulator (3) and high-voltage pot-type insulator (5) are connected to the transformer leads by bolts on the inside, and are movably connected to the GIS, GIL and gas-insulated neutral point grounding device on the outside by spring contacts.

5. The fully enclosed transformer with input and output lines according to claim 1, characterized in that: The three-phase common-box pot-type insulator (1), the neutral point pot-type insulator (3) and the high-voltage pot-type insulator (5) are used in an environment where the insulating medium is transformer oil and sulfur hexafluoride gas.

6. A fully enclosed transformer with incoming and outgoing lines according to claim 1, characterized in that The three-phase common-box pot-type insulator (1), the neutral point pot-type insulator (3) and the high-voltage pot-type insulator (5) are provided with a partial discharge monitoring interface, which can monitor the partial discharge information inside the transformer online.

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