A test voltage transformer for GIS

Abstract

The application relates to a test voltage transformer for GIS, characterized by comprising a basin type insulator, a conductive tube, a shell, a body part, an inflation valve, a test terminal box, a PT terminal box, a base and an explosion-proof sheet; the structure of the transformer is adopted to realize the power and the function of the transformer, the volume of the transformer is reduced, the transformer is suitable for small range power supply, the manufacturing cost of the transformer is reduced, a larger transformation ratio can be realized, the high-voltage coil of the body part adopts a pagoda structure and has the advantages of uniform voltage distribution and good insulation performance, the low-voltage winding adopts a layer type transposition structure and is additionally provided with an air channel to reduce the winding loss and improve the heat dissipation performance, compared with an oil-immersed transformer, the risk of flammability is reduced; the test terminal box is increased to be used for connecting a test voltage source, and a capacitor voltage divider is arranged in the test terminal box to be used for measuring the test voltage during the test; the voltage transformer can be used as a conventional transformer and can also meet the requirement of PVT test.

Description

Technical Field

[0001] This invention relates to the field of voltage transformers for GIS, and more particularly to a test voltage transformer for GIS. Background Technology

[0002] Generally speaking, a transformer is a device that changes AC voltage or current by utilizing electromagnetic induction. Traditional transformers typically use oil-immersed insulation, which has disadvantages such as large size, heavy structure, easy aging, fire hazard, poor resistance to electromagnetic interference, low electrical insulation strength, high core loss, high partial discharge, and high equipment cost. Moreover, it is not suitable for small-scale power supply. Therefore, we need to invent a gas-insulated transformer that is small in size, has a reasonable structural layout, low manufacturing cost, and is suitable for small-scale power supply.

[0003] Furthermore, conventional gas-insulated transformers for small-scale power supply cannot meet the requirements for GIS testing. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a test voltage transformer for GIS, which can solve the problem that conventional voltage transformers do not have a capacitor divider structure and cannot meet the requirements for GIS testing.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a test voltage transformer for GIS, the innovation of which is: including a basin-type insulator, a conductive tube, a shell, transformer body components, an air filling valve, a test junction box, a PT junction box, a base, and an explosion-proof sheet; The top of the housing is provided with a basin-type insulator, and the bottom of the basin-type insulator is fixed to the top of the housing by a cap; a test junction box and a PT junction box are provided on the side wall of the housing; a capacitor voltage divider is provided inside the test junction box; the conductive tube is arranged vertically and the bottom end of the conductive tube is connected to the body component, and the top end of the conductive tube is connected to the basin-type insulator. The inflation valve is located on the side wall of the housing and is used to fill the housing with gas. The transformer body is mounted on the base. The transformer body includes a high-voltage coil, a low-voltage coil, an iron core, a side shield, and a bottom shield. The high-voltage coil is sleeved on the outside of the low-voltage coil, and the low-voltage coil is sleeved on the outside of the iron core. The side shields are located at both ends of the iron core, and the bottom shield is located below the iron core. The iron core is fixed inside the housing by an iron core clamp. The outer circular surface of the high-voltage coil is an inclined surface that gradually decreases from the inside to the outside. The high-voltage coil is connected to the basin-type insulator. The explosion-proof plate is located at the bottom of the housing.

[0006] Furthermore, the high-voltage coil is wound on a high-voltage insulating cylinder, the high-voltage insulating cylinder is sleeved on the outside of the low-voltage coil, the low-voltage coil is wound on the outside of the low-voltage insulating cylinder, the low-voltage insulating cylinder is sleeved on the outside of the iron core, and the low-voltage coil is a helical winding.

[0007] Furthermore, the bottom shield is fixed to the core clamp.

[0008] The advantages of this invention are: 1) The test voltage transformer for GIS in this invention has a novel structure. It achieves the power and function of a transformer using the structure of a transformer, reducing the size of the transformer, making it suitable for small-scale power supply, reducing the manufacturing cost of the transformer, and achieving a larger transformation ratio. The high-voltage coil with a pagoda structure in the transformer body has the advantages of uniform voltage distribution and good insulation performance. The low-voltage winding adopts a layered transposition structure and adds air ducts to reduce winding losses and improve heat dissipation performance, reducing the risk of flammability compared with oil-immersed transformers. By adding a test junction box for connecting the test voltage source, and setting a capacitive voltage divider in the test junction box for measuring the test voltage during testing, this voltage transformer can be used as a conventional transformer and can also meet the testing requirements of PVT. Attached Figure Description

[0009] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0010] Figure 1 This is a schematic diagram of the structure of a test voltage transformer for GIS according to the present invention.

[0011] Figure 2 This is a circuit diagram of the test junction box and PT junction box for a GIS test voltage transformer according to the present invention.

[0012] Figure 3 This is a partial cross-sectional view of the body components of a test voltage transformer for GIS according to the present invention. Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0015] like Figures 1 to 3 The GIS test voltage transformer shown includes a basin insulator 1, a conductive tube 2, a housing 3, a transformer body component 4, an air filling valve 5, a test junction box 6, a PT junction box 7, a base 8, and an explosion-proof sheet 9. A basin-type insulator 1 is provided at the top of the housing 3, and the bottom of the basin-type insulator 1 is fixed to the top of the housing 3 through a cap; a test junction box 6 and a PT junction box 7 are provided on the side wall of the housing 3; a capacitor voltage divider is provided inside the test junction box 7; a conductive tube 2 is arranged in a vertical direction and the bottom end of the conductive tube 2 is connected to the body component 4, and the top end of the conductive tube 2 is connected to the basin-type insulator 1. The inflation valve 5 is located on the side wall of the housing and is used to fill the housing 3 with gas. The transformer body component 4 is mounted on the base. The transformer body includes a high-voltage coil 41, a low-voltage coil 42, an iron core 43, a side shield 44, and a bottom shield 45. The high-voltage coil 41 is sleeved on the outside of the low-voltage coil 42, and the low-voltage coil 42 is sleeved on the outside of the iron core 43. The side shield 44 is located at both ends of the iron core, and the bottom shield 45 is located below the iron core 43. The iron core 43 is fixed in the housing by the iron core clamp 46. The outer circular surface of the high-voltage coil 41 is an inclined surface that gradually decreases from the inside to the outside. The high-voltage coil 41 is connected to the basin insulator 1. The explosion-proof plate 9 is located at the bottom of the housing 3.

[0016] The high-voltage coil 41 is wound on the high-voltage insulating cylinder, which is sleeved on the outside of the low-voltage coil 42. The low-voltage coil 42 is wound on the outside of the low-voltage insulating cylinder, which is sleeved on the outside of the iron core 43. The low-voltage coil 42 is a spiral winding.

[0017] The bottom shield 45 is fixed on the core clamp 46.

[0018] The working principle of this invention is as follows: The GIS test voltage transformer has a novel structure, achieving the power and function of a transformer through the structure of a transformer, reducing the transformer's size, making it suitable for small-scale power supply, lowering the transformer's manufacturing cost, and simultaneously achieving a larger transformation ratio; the high-voltage coil with a pagoda structure in the transformer body has the advantages of uniform voltage distribution and good insulation performance, while the low-voltage winding adopts a layered transposition structure and adds air ducts to reduce winding losses and improve heat dissipation performance, reducing the risk of flammability compared to oil-immersed transformers; by adding a test junction box for connecting the test voltage source, and installing a capacitive voltage divider inside the test junction box for measuring the test voltage during testing; this voltage transformer can be used as a conventional transformer and can also meet the testing requirements of PVT.

[0019] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A test voltage transformer for GIS, characterized in that: Includes basin-type insulators, conductive tubes, housings, core components, inflation valves, test junction boxes, PT junction boxes, bases, and explosion-proof sheets; The top of the housing is provided with a basin-type insulator, and the bottom of the basin-type insulator is fixed to the top of the housing by a cap; a test junction box and a PT junction box are provided on the side wall of the housing; a capacitor voltage divider is provided inside the test junction box; the conductive tube is arranged vertically and the bottom end of the conductive tube is connected to the body component, and the top end of the conductive tube is connected to the basin-type insulator. The inflation valve is located on the side wall of the housing and is used to fill the housing with gas. The transformer body is mounted on the base. The transformer body includes a high-voltage coil, a low-voltage coil, an iron core, a side shield, and a bottom shield. The high-voltage coil is sleeved on the outside of the low-voltage coil, and the low-voltage coil is sleeved on the outside of the iron core. The side shields are located at both ends of the iron core, and the bottom shield is located below the iron core. The iron core is fixed inside the housing by an iron core clamp. The outer circular surface of the high-voltage coil is an inclined surface that gradually decreases from the inside to the outside. The high-voltage coil is connected to the basin-type insulator. The explosion-proof plate is installed at the bottom of the housing; The high-voltage coil is wound on a high-voltage insulating cylinder, which is sleeved on the outside of the low-voltage coil. The low-voltage coil is wound on the outside of the low-voltage insulating cylinder, which is sleeved on the outside of the iron core. The low-voltage coil is a helical winding.

2. The test voltage transformer for GIS according to claim 1, characterized in that: The bottom shield is fixed to the core clamp.

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