Voltage transformer for railway switch cabinet

Abstract

The utility model relates to an electrified railway line measurement and control device, in particular to a voltage transformer for a railway switch cabinet. Comprising a main insulator and a transformer body sealed in the main insulator, a primary high-voltage terminal is arranged at the top of the main insulator, a secondary wiring platform is arranged at the bottom of the front end of the main insulator, and a secondary wiring terminal is arranged on the secondary wiring platform; the transformer body comprises an iron core, a secondary winding and a primary winding, the secondary winding and the primary winding are concentrically wound on the iron core from inside to outside, the primary winding is connected with the primary high-voltage terminal through a primary lead, the primary lead is spiral, and the secondary winding is connected with the secondary wiring terminal through a secondary lead. The utility model has the characteristics of small volume, flexible installation, reliable insulation and overvoltage impact resistance, is completely suitable for being used in an electrified railway environment, and integrally improves the manufacturing level of railway line electrical equipment.

Description

Technical Field

[0001] The utility model relates to an electric railway line measurement and control device, in particular to a voltage transformer for railway switch cabinets. Background Art

[0002] The electrified railway line converts three-phase 110KV (or 220KV) high-voltage AC into two single-phase 27.5KV AC, and then transmits electricity to the railway contact network to supply traction power. The voltage transformer on the line is an electrical device that connects the primary and secondary, and is mainly used as a power source for line measurement and control devices in electrified railway lines. Its design level is in the 1970s in China. The structural form is a semi-enclosed structure with exposed iron core. The product is large in size and poor in insulation reliability. Based on the working conditions of the railway line, there are many dirt accumulation, moisture, condensation, grounding faults, high operating overvoltage, frequent overvoltage, and often prone to pollution flashover, insulation breakdown discharge and other faults. Therefore, in order to further improve the reliability of railway traction power supply, it is necessary to develop a voltage transformer suitable for railway line switchgear to improve the overall manufacturing level of railway line equipment. Utility Model Content

[0003] In view of the above problems, the purpose of the utility model is to provide a voltage transformer for railway switch cabinet to solve the problems of pollution flashover, insulation breakdown and discharge in high-voltage voltage transformers due to the special environment of existing railway lines.

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

[0005] The utility model provides a voltage transformer for railway switch cabinet, comprising a main insulator and a voltage body sealed in the main insulator, wherein a primary high-voltage terminal is arranged on the top of the main insulator, a secondary wiring platform is arranged on the front bottom of the main insulator, and a secondary wiring terminal is arranged on the secondary wiring platform; the voltage body comprises an iron core, a secondary winding and a primary winding, the secondary winding and the primary winding are concentrically wound on the iron core from inside to outside, the primary winding is connected to the primary high-voltage terminal through a primary lead wire, the primary lead wire is spiral, and the secondary winding is connected to the secondary wiring terminal through the secondary lead wire.

[0006] The primary winding is a tower-shaped structure formed by winding a plurality of enameled round copper wires in parallel into a turn in multiple stages, and the number of turns of the multiple stages decreases from the inside to the outside, and the number of turns of each layer in the same stage is the same.

[0007] The upper end of the primary lead is wound around the upper middle portion of the primary high-voltage terminal.

[0008] The primary high-voltage terminal is arranged on a primary truncated cone provided on the top of the main insulator, and the primary truncated cone transitions to the main insulator in an arc.

[0009] The front and rear end surfaces of the main insulator are symmetrically arranged stepped protrusion structures with gradually shrinking widths.

[0010] The stepped protrusion structure includes two symmetrically arranged two-stage inclined surfaces and vertical planes located at the ends of the two two-stage inclined surfaces, wherein the upper ends of the two two-stage inclined surfaces are connected through a semicircular top transition.

[0011] The lower parts of the left and right sides of the main insulator are both provided with grooves.

[0012] The main insulator is an integrated structure formed by vacuum casting of epoxy resin and the voltage device body.

[0013] The main insulator is installed on a bottom plate, and a grounding terminal is provided on the bottom plate at the rear side of the main insulator.

[0014] The secondary wiring platform is provided with a wiring protection cover.

[0015] The advantages and beneficial effects of the utility model are:

[0016] 1. Small size, light weight, and full functions: The utility model adopts a rolled iron core and multiple enameled round copper wires to wind the primary winding. It has a compact structure, small size, full functions, and optimized structural design. It is particularly suitable for use with new voltage transformers in railway switch cabinets.

[0017] 2. Uniform distribution of electric field and protection against overvoltage: The primary winding of the utility model is a tower-shaped structure in which a plurality of enameled round copper wires are arranged side by side as one turn and wound in multiple stages, and the number of turns of the multiple stages decreases from the inside to the outside. The number of turns of each layer in the same stage is the same, the number of turns of each layer decreases, the field strength between layers becomes smaller, and the electric field is evenly distributed; and the primary winding lead is wound in a spiral shape, which has a high overvoltage resistance capability and can be applied to any high-altitude area of ​​the railway line. There will be no insulation breakdown damage when operating under long-term overvoltage conditions;

[0018] 3. Cracking resistance and high mechanical strength: The utility model is designed with high-performance epoxy resin materials to ensure that the product has sufficient mechanical strength and performance to ensure that the product will not deteriorate and deteriorate. It is suitable for various environmental conditions along the railway and ensures that the product will not have resin cracking and insulation failure.

[0019] 4. Easy installation and maintenance-free product: When installing and using the utility model, you only need to fix the transformer base plate in the railway switch cabinet, and connect the primary, secondary and grounding wires, which effectively saves the assembly time of the switch cabinet; the product is simpler to overhaul, does not require regular maintenance, and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of a voltage transformer for a railway switch cabinet of the utility model;

[0021] Figure 2 This is a front view of a voltage transformer for a railway switch cabinet according to the utility model;

[0022] Figure 3 for Figure 2 Left view of

[0023] Figure 4 for Figure 2 Top view of the .

[0024] In the figure: 1- iron core; 2- secondary winding; 3- primary winding; 4- primary high-voltage terminal; 5- main insulator; 6- bottom plate; 7- secondary terminal block; 8- wiring protection cover; 9- grounding terminal; 10- voltage body; 11- groove; 12- primary lead. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 4 As shown, the utility model provides a voltage transformer for railway switch cabinet, including a main insulator 5 and a voltage body 10 sealed in the main insulator 5, wherein a primary high-voltage terminal 4 is provided on the top of the main insulator 5, a secondary wiring platform 7 is provided at the bottom of the front end of the main insulator 5, and a secondary wiring terminal is provided on the secondary wiring platform 7; the voltage body 10 includes an iron core 1, a secondary winding 2 and a primary winding 3, the secondary winding 2 and the primary winding 3 are concentrically wound on the iron core 1 from inside to outside, the primary winding 3 is connected to the primary high-voltage terminal 4 through a primary lead 12, the primary lead 12 is spiral, and the secondary winding 2 is connected to the secondary wiring terminal through the secondary lead.

[0027] In the embodiment of the utility model, the primary winding 3 is a tower-shaped structure formed by winding a plurality of enameled round copper wires in parallel as one turn in multiple stages, and the number of turns of the multiple stages decreases from the inside to the outside, and the number of turns of each layer in the same stage is the same.

[0028] Furthermore, the upper end of the primary lead 12 is wound around the middle and upper part of the primary high-voltage terminal 4, and the primary lead 12 is spirally located between the primary high-voltage terminal 4 and the primary winding 3, ensuring that the primary winding 3 is not damaged by continuous overvoltage impact, having a high overvoltage resistance, and can be applied to any high-altitude area of ​​the railway line. The primary high-voltage terminal 4 is arranged on the primary truncated cone provided on the top of the main insulator 5, and the primary truncated cone transitions with the main insulator 5 in an arc.

[0029] Specifically, the primary high-voltage terminal 4 is a plane with rounded corners, located on the upper part of the main insulator 5, to ensure smooth connection with the high-voltage electrical equipment of the system, increase the insulation level, and ensure that no dirty flashover voltage occurs.

[0030] In the embodiment of the utility model, the main insulator 5 is an integrated structure made of epoxy resin and the voltage body 10 by vacuum casting. The front and rear end surfaces of the main insulator 5 are symmetrically arranged stepped protrusion structures with gradually shrinking widths. The stepped protrusion structure includes two symmetrically arranged two-level inclined surfaces and vertical planes located at the ends of the two two-level inclined surfaces, wherein the upper ends of the two two-level inclined surfaces are connected by a semicircular top transition, which ensures uniform insulation distance and facilitates dust and other dirt to slide away smoothly and avoid maintenance. Grooves 11 are provided at the lower part of the left and right sides of the main insulator 5.

[0031] Furthermore, the main insulator 5 is mounted on the bottom plate 6, and a grounding terminal 9 is provided on the bottom plate 6 at the rear side of the main insulator 5 for user grounding to ensure reliable grounding and increase the insulation distance between the product surface and the ground to ensure safe and reliable operation of the product. A wiring protection cover 8 is provided on the secondary wiring station 7 to effectively ensure reliable sealing of the secondary wiring terminal and prevent electricity theft.

[0032] The utility model provides a voltage transformer for railway switch cabinet, and the preparation process thereof is as follows:

[0033] The secondary winding 2 and the primary winding 3 are concentrically wound on an insulating frame and then mounted on the iron core 1. The iron core 1 adopts a rolled iron core with a compact structure and a small volume. After insulation and buffer wrapping, a voltage body 10 is formed and fixed in a casting mold. The primary lead 12 is spirally arranged in the center. After adjusting the distance, the insulation is cured by vacuum casting with epoxy resin, thereby forming an integrated structure consisting of a primary terminal 4, a primary lead 12, a main insulator 5, a secondary terminal block 5, etc., and finally the whole is installed on the base plate 6.

[0034] Specifically, the primary winding 3 is a tower-shaped structure formed by winding a plurality of enameled round copper wires in parallel into a turn in multiple stages, and the number of turns of the multiple stages decreases from the inside to the outside, and the number of turns of each layer in the same stage is the same. As the number of turns of each layer decreases, the field strength between the layers becomes smaller, and the electric field is evenly distributed;

[0035] Furthermore, the primary lead 12 is an enameled round copper wire that is spirally wound from bottom to top and arranged in the middle and upper part of the primary winding 3 to the primary high-voltage terminal 4 to ensure that the primary coil is not damaged by continuous overvoltage impact; the main insulator 5 that seals the voltage body 10 is wide in the middle and scaled into a semicircular arch at both ends, with recessed grooves at the bottom of the left and right sides, and the front and rear ends slide down, which is conducive to the smooth sliding of dust and other dirt. The secondary wiring station 7 is an integral structure cast as a whole, located in the front and lower part of the main insulator 5, and a wiring protection cover 8 is arranged above the secondary wiring station 7, which can effectively ensure the reliable sealing of the secondary wiring terminal and prevent electricity theft. A grounding terminal 9 is arranged at the end of the bottom plate 6 to facilitate user grounding and ensure reliable grounding; the grounding terminal 9 is located at the lower rear end of the main insulator 5 to increase the insulation distance of the product surface to the ground.

[0036] When in use, it is only necessary to fix the transformer base plate in the railway switch cabinet, and then connect the primary terminal 4, the secondary end of the secondary terminal block 7 and the grounding terminal 9, and the installation of the voltage transformer for the railway switch cabinet is completed, which can effectively save the assembly time of the switch cabinet.

[0037] The utility model provides a voltage transformer for railway switch cabinet, which adopts epoxy resin vacuum casting insulation to form an integrated structure, ensuring that the product has sufficient mechanical strength performance and that the product will not decline and deteriorate. The utility model is mainly used for measurement and protection of line measurement and control devices in electrified railway lines, and has the characteristics of small size, flexible installation, reliable insulation, and resistance to overvoltage impact. It is completely suitable for use in electrified railway environments and improves the overall manufacturing level of railway line electrical equipment.

[0038] The above description is only an implementation method of the utility model and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the utility model are included in the protection scope of the utility model.

Claims

1. A voltage transformer for railway switch cabinet, characterized in that: The invention comprises a main insulator (5) and a voltage body (10) sealed in the main insulator (5), wherein a primary high-voltage terminal (4) is provided at the top of the main insulator (5), a secondary wiring platform (7) is provided at the front bottom of the main insulator (5), and a secondary wiring terminal is provided on the secondary wiring platform (7); the voltage body (10) comprises an iron core (1), a secondary winding (2) and a primary winding (3), the secondary winding (2) and the primary winding (3) are concentrically wound on the iron core (1) from the inside to the outside, the primary winding (3) is connected to the primary high-voltage terminal (4) through a primary lead wire (12), the primary lead wire (12) is spiral, and the secondary winding (2) is connected to the secondary wiring terminal through the secondary lead wire.

2. The voltage transformer for railway switch cabinet according to claim 1, characterized in that: The primary winding (3) is a tower-shaped structure formed by winding a plurality of enameled round copper wires in parallel into a turn in multiple stages, wherein the number of turns decreases from the inside to the outside, and the number of turns of each layer in the same stage is the same.

3. The voltage transformer for railway switch cabinet according to claim 1, characterized in that: The upper end of the primary lead wire (12) is wound around the upper middle portion of the primary high-voltage terminal (4).

4. The voltage transformer for railway switch cabinet according to claim 1, characterized in that: The primary high-voltage terminal (4) is arranged on a primary truncated cone provided on the top of the main insulator (5), and the primary truncated cone transitions to the main insulator (5) in an arc.

5. The voltage transformer for railway switch cabinet according to claim 1, characterized in that: The front and rear end surfaces of the main insulator (5) are symmetrically arranged stepped protrusion structures with gradually shrinking widths.

6. The voltage transformer for railway switch cabinet according to claim 5, characterized in that: The stepped protrusion structure includes two symmetrically arranged two-stage inclined surfaces and vertical planes located at the ends of the two two-stage inclined surfaces, wherein the upper ends of the two two-stage inclined surfaces are connected through a semicircular top transition.

7. The voltage transformer for railway switch cabinet according to claim 5, characterized in that: The lower parts of the left and right sides of the main insulator (5) are both provided with grooves (11).

8. The voltage transformer for railway switch cabinet according to claim 5, characterized in that: The main insulator (5) is an integrated structure formed by vacuum casting of epoxy resin and the voltage device body (10).

9. The voltage transformer for railway switch cabinet according to claim 1, characterized in that: The main insulator (5) is mounted on a base plate (6), and a grounding terminal (9) is provided on the base plate (6) and is located at the rear side of the main insulator (5).

10. The voltage transformer for railway switch cabinet according to claim 1, characterized in that: The secondary wiring platform (7) is provided with a wiring protection cover (8).

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