Voltage transformer for electric locomotive

Abstract

The utility model relates to high-voltage measurement or relay protection equipment of an electric locomotive contact power supply system, in particular to a voltage transformer for an electric locomotive. Comprising a main insulator and a transformer body sealed in the main insulator, the lower portion of the main insulator is of a square structure, the front end and the rear end of the square structure are each provided with a protruding structure with the width gradually reduced, the upper portion of the main insulator is of a pagoda-shaped structure, and the top of the pagoda-shaped structure is provided with a primary wiring terminal. A secondary junction box is arranged at the bottom of the front end of the main insulator, a secondary wiring terminal is arranged in the secondary junction box, and the secondary wiring terminal is connected with the miniature circuit breaker assembly through a cable. The device is stable in insulation, strong in anti-interference capability, high in measurement precision, moisture-proof, waterproof, maintenance-free, small in size, simple in structure and totally closed, can greatly improve the reliability of power supply, and can be widely applied to various types of electric locomotives or newly designed types of locomotives.

Description

Technical Field

[0001] The utility model relates to high-voltage measuring or relay protection equipment for a contact power supply system of an electric locomotive, in particular to a voltage transformer for an electric locomotive. Background Art

[0002] Indoor voltage transformers are devices for measuring voltage, real-time monitoring or relay protection in the power supply system of electric locomotives. The current status of indoor voltage transformers used in electric locomotives: most of them rely on imported voltage transformers with oil-paper insulation and magnetic bottle insulation or dry resin insulation voltage transformers; their disadvantages: because the product operation is always in a dynamic operation and frequent network voltage fluctuation environment, oil-immersed voltage transformers often have problems such as oil leakage, poor anti-interference ability, poor measurement accuracy, moisture-absorbing oil deterioration, and unstable insulation. Or dry resin insulation voltage transformers are extremely easy to be unsuitable for my country's railway environmental conditions, and often have unreliable insulation and prone to fog flash, requiring frequent maintenance and inspection work; in addition, the product is heavy, large in size, inconvenient to install, and has a low service life. These have always been a problem that has plagued electric locomotive maintenance personnel, and are also urgent issues to be solved in the localization and electrification of electric locomotives. Utility Model Content

[0003] In view of the above problems, the purpose of the utility model is to provide a voltage transformer for electric locomotives to solve the problems of existing electric locomotive indoor oil-immersed voltage transformers, such as easy oil leakage, poor anti-interference ability, poor measurement accuracy, hygroscopic oil deterioration, unstable insulation, short service life, complex maintenance (repair) and installation.

[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 electric locomotives, comprising a main insulator and a voltage body sealed in the main insulator, wherein the lower part of the main insulator is a square structure, and the front and rear ends of the square structure are both provided with convex structures with gradually shrinking widths, the upper part of the main insulator is a pagoda-shaped structure, the top of the pagoda-shaped structure is provided with a primary wiring terminal, the front bottom of the main insulator is provided with a secondary wiring box, the secondary wiring box is provided with a secondary wiring terminal, and the secondary wiring terminal is connected to a miniature circuit breaker assembly through a cable.

[0006] The voltage device body includes an iron core, a secondary winding and a primary winding, wherein the secondary winding and the primary winding are concentrically wound on the iron core from the inside to the outside, the primary winding is connected to the primary terminal through a spring-shaped primary lead, and the secondary winding is connected to the secondary terminal through a secondary lead.

[0007] The primary winding adopts a stepped structure formed by winding a plurality of enameled round copper wires in parallel into one turn in two stages, and the number of turns of the two stages decreases from the inside to the outside, and the number of turns of each layer in the same stage is the same.

[0008] The protruding structure comprises two symmetrically arranged two-stage inclined surfaces and vertical surfaces located at the ends of the two two-stage inclined surfaces, wherein the tops of the two two-stage inclined surfaces are connected through a semicircular top transition.

[0009] Main shed skirts are symmetrically arranged on the raised structures at the front and rear ends of the lower part of the main insulator.

[0010] The front and rear sides of the lower part of the pagoda-shaped structure are symmetrically provided with auxiliary umbrella skirts of arc structure, and the upper part of the pagoda-shaped structure is provided with a top umbrella skirt of an annular structure.

[0011] The lower parts of the left and right side surfaces of the main insulator are provided with grooves, and strip-shaped bottom umbrella skirts are arranged in the grooves.

[0012] A base is provided at the bottom of the main insulator, and a grounding terminal is provided on the base and is located at the rear side of the main insulator.

[0013] The miniature circuit breaker assembly comprises a shell, an upper cover, a miniature circuit breaker and a guide rail, wherein the guide rail is arranged at the bottom of the shell, the miniature circuit breaker is slidably connected to the guide rail, the upper cover is arranged at the top of the shell, and an assembly waterproof cable connector connected to the miniature circuit breaker is provided on the side wall of the shell.

[0014] The main insulator is cast with epoxy resin and the voltage device body to form an integrated structure.

[0015] The utility model has the following advantages and beneficial effects:

[0016] 1. High measurement accuracy and strong resistance to overvoltage impact interference. The utility model adopts optimized electric field design and is made of high-quality iron core materials. It has high measurement accuracy. The primary winding is wound with multiple enameled round copper wires, the interlayer field strength becomes smaller, and the primary lead is set in a spring shape, which has strong resistance to primary overvoltage impact and anti-interference ability.

[0017] 2. Fully enclosed, moisture-proof and waterproof, maintenance-free: The utility model can be directly installed in the internal distribution cabinet of the electric locomotive. The primary and secondary coils are vacuum-cast with epoxy resin materials to form a fully enclosed structure. The secondary outlet adopts a waterproof cable connector design, which is waterproof and moisture-proof during use, eliminating the need for regular maintenance and simplifying the maintenance (repair) work intensity;

[0018] 3. Small size, easy to install, high mechanical strength: The utility model adopts epoxy resin vacuum casting to form an integrated structure. The product is small in size and light in weight. It can be flexibly installed in the power distribution cabinet of the electric locomotive. It has high mechanical strength and can effectively ensure that the product is resistant to vibration and impact during the dynamic operation of the electric locomotive, and has high fatigue strength;

[0019] 4. Secondary fuse protection: The utility model adopts a miniature circuit breaker assembly provided with a miniature circuit breaker secondary fuse protection to ensure safe operation of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the internal structure of a voltage transformer for electric locomotives according to the utility model;

[0021] Figure 2 This is a front view of the external structure of the voltage transformer for electric locomotives of the utility model;

[0022] Figure 3 for Figure 2 Left view of;

[0023] Figure 4 for Figure 2 A top view of

[0024] Figure 5 It is a structural schematic diagram of the miniature circuit breaker in the utility model;

[0025] Figure 6 for Figure 5 Top view of the .

[0026] In the figure: 1. iron core; 2. secondary winding; 3. primary winding; 4. primary terminal; 5. main insulator; 6. base; 7. secondary terminal; 8. secondary junction box; 9. grounding terminal; 10. top shed; 11. main shed; 12. miniature circuit breaker assembly; 13. assembly waterproof cable connector; 14. secondary cover; 15. secondary rubber pad; 16. primary lead; 17. auxiliary shed; 18. outlet waterproof cable connector; 19. bottom shed; 20. upper cover; 21. housing; 22. miniature circuit breaker; 23. guide rail. DETAILED DESCRIPTION

[0027] 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.

[0028] like Figures 1 to 4 As shown, the utility model provides a voltage transformer for electric locomotives, including a main insulator 5 and a voltage body sealed in the main insulator 5, wherein the lower part of the main insulator 5 is a square structure, and the front and rear ends of the square structure are provided with a convex structure with a gradually shrinking width, the upper part of the main insulator 5 is a pagoda-shaped structure, and the top of the pagoda-shaped structure is provided with a primary terminal 4, and the front bottom of the main insulator 5 is provided with a secondary junction box 8, and the secondary junction box 8 is provided with a secondary terminal 7, and the secondary terminal 7 is connected to the miniature circuit breaker assembly 12 through a cable.

[0029] like Figure 1As shown, in an embodiment of the utility model, the voltage device body includes an iron core 1, a secondary winding 2 and a primary winding 3, wherein 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 terminal 4 through a spring-shaped primary lead 16, and the secondary winding 2 is connected to the secondary terminal 7 through a secondary lead.

[0030] In the embodiment of the utility model, the primary winding 3 adopts a stepped structure in which a plurality of enameled round copper wires are arranged side by side as one turn and wound in two stages, and the number of turns of the two stages decreases from the inside to the outside, and the number of turns of each layer in the same stage is the same.

[0031] like Figures 2 to 4 As shown, in the embodiment of the utility model, the raised structures at the front and rear ends of the lower part of the main insulator 5 are symmetrically arranged, and each includes two symmetrically arranged two-stage inclined surfaces and vertical surfaces located at the ends of the two two-stage inclined surfaces, wherein the tops of the two two-stage inclined surfaces are connected by a semicircular top transition.

[0032] Furthermore, main sheds 11 are symmetrically arranged on the raised structures at the front and rear ends of the lower part of the main insulator 5. Auxiliary sheds 17 of arc-shaped structures are symmetrically arranged on the front and rear sides of the lower part of the pagoda-shaped structure, and a top shed 10 of annular structure is arranged on the upper part of the pagoda-shaped structure. Grooves are arranged at the lower part of the left and right sides of the main insulator 5, and strip-shaped bottom sheds 19 are arranged in the grooves.

[0033] Furthermore, the main insulator 5 is cast with epoxy resin and the transformer body as an integrated structure. A base 6 is provided at the bottom of the main insulator 5, and a grounding terminal 9 is provided on the base 6 and is located at the rear side of the main insulator 5. The main shed 11 and the auxiliary shed 17 of the main insulator 5 are both provided in the front and rear and are arranged symmetrically, and the bottom shed 19 is provided on the left and right sides, which is also symmetrical, so as to increase the surface creepage distance.

[0034] like Figure 5 , Figure 6 As shown, in the embodiment of the utility model, the miniature circuit breaker assembly 12 includes a housing 20, an upper cover 21, a miniature circuit breaker 22 and a guide rail 23, wherein the guide rail 23 is arranged at the bottom of the housing 21, the miniature circuit breaker 22 is slidably connected to the guide rail 23, the upper cover 20 is arranged at the top of the housing 21, and the side wall of the housing 21 is provided with an assembly waterproof cable connector 13 connected to the miniature circuit breaker 22. The miniature circuit breaker 22 can slide left and right on the guide rail 23, which is convenient for secondary wiring and has a fuse protection function. The assembly waterproof cable connector 13 is connected to the outlet hole waterproof cable connector 18 of the secondary junction box 8 through a cable, which is convenient for wiring.

[0035] The utility model provides a voltage transformer for electric locomotive, and its preparation process is:

[0036] The secondary winding 2 and the primary winding 3 are concentrically wound on an insulating frame and then mounted on the core column of the iron core 1. The primary winding 3 adopts a stepped structure in which a plurality of enameled round copper wires are arranged side by side as a turn and are wound in two stages. The number of turns of the two stages decreases step by step from the inside to the outside. The number of turns of each layer in the same stage is the same, the interlayer field strength becomes smaller, the electric field distribution is uniform, and the partial discharge of the product is small. After insulation and buffering wrapping, it is fixed in a casting mold, and the primary lead 16 between the primary terminal 4 and the primary winding 3 is connected. The primary lead 16 is spring-shaped and has strong resistance to primary overvoltage impact and anti-interference capabilities. Finally, epoxy resin is vacuum cast and solidified to form a core 1, a secondary winding 2, a primary winding 3, a primary lead 16, The primary terminal 4, the secondary junction box 8, and the secondary terminal 7 are the main insulator 5; the main insulator 5 is designed with a pagoda-shaped top shed 10 with equal spacing insulation from top to bottom, and a front-to-back symmetrical main shed 11 is arranged on the outer side of the lower part of the main insulator 5 that seals the voltage body. A front-to-back symmetrical auxiliary shed 17 is designed between the top shed 10 and the main shed 11 to increase the creepage distance. The transformer as a whole adopts an epoxy resin vacuum casting as an integrated structure, and the optimized structural design ensures uniform insulation distance. The main body of the main insulator 5 is a semicircular arch in the middle with a front-to-back semicircular step-type transition, and bottom sheds 19 are arranged in the grooves at the lower left and right sides, which not only makes the internal secondary low-voltage electric field strength evenly distributed, but also effectively increases the surface creepage distance of the product. The integrated structure is integrally mounted on a square base 6. The outlet hole of the secondary junction box 8 is designed to be equipped with a waterproof cable connector 18 and is connected to the miniature circuit breaker assembly 12, which not only ensures that the secondary terminal has waterproof and moisture-proof functions, but also facilitates reliable connection of external cables and secondary fuse protection function; finally, the whole is installed on a square base 6, which is convenient for overall installation in the internal distribution cabinet of the electric locomotive.

[0037] Furthermore, the secondary junction box 8 and the overall structure are cast in epoxy resin as an integrated structure, located at the front side and below the main insulator 5, with a certain mechanical strength, and the secondary rubber pad 15 and the secondary cover plate 14 are fixed with lead-sealed screws, so that the secondary wiring seal is more reliable and has an anti-electricity theft function. The outlet hole waterproof cable connector 18 of the secondary junction box 8 is located on both sides, and the internal secondary wiring terminal 7 is connected to the miniature circuit breaker assembly 12, the secondary seal is reliable, and the single miniature circuit breaker assembly 12 can be flexibly installed.

[0038] The utility model provides a voltage transformer for electric locomotives, which is a new product designed in full accordance with national standards and railway standards. It adopts a rolled iron core and uses the electromagnetic conversion principle to enable the secondary voltage to accurately reflect the change of the measured primary voltage and transmit it to the secondary control device; the product can be directly installed in the electric locomotive line for voltage measurement and relay protection. The utility model has stable insulation, strong anti-interference ability, high measurement accuracy, moisture-proof and waterproof, maintenance-free, small size, simple structure, fully enclosed, and can greatly improve the reliability of power supply. It can be widely used in various types of electric locomotives or newly designed locomotives, and realizes the electrical programming, standardization, oil-free and localization of the electric locomotive electrical system.

[0039] 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 electric locomotive, characterized in that: The invention comprises a main insulator (5) and a voltage body sealed in the main insulator (5), wherein the lower part of the main insulator (5) is a square structure, and the front and rear ends of the square structure are provided with a convex structure with a gradually shrinking width, the upper part of the main insulator (5) is a pagoda-shaped structure, and the top of the pagoda-shaped structure is provided with a primary wiring terminal (4), and the front bottom of the main insulator (5) is provided with a secondary wiring box (8), and the secondary wiring box (8) is provided with a secondary wiring terminal (7), and the secondary wiring terminal (7) is connected to the miniature circuit breaker assembly (12) through a cable.

2. The voltage transformer for electric locomotive according to claim 1, characterized in that: The voltage transformer body comprises an iron core (1), a secondary winding (2) and a primary winding (3), wherein 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 terminal (4) via a spring-shaped primary lead (16), and the secondary winding (2) is connected to the secondary terminal (7) via a secondary lead.

3. The voltage transformer for electric locomotive according to claim 2, characterized in that: The primary winding (3) adopts a stepped structure formed by winding a plurality of enameled round copper wires in parallel into one turn in two stages, and the number of turns of the two stages decreases from the inside to the outside, and the number of turns of each layer in the same stage is the same.

4. The voltage transformer for electric locomotive according to claim 1, characterized in that: The protruding structure comprises two symmetrically arranged two-stage inclined surfaces and vertical surfaces located at the ends of the two two-stage inclined surfaces, wherein the tops of the two two-stage inclined surfaces are connected through a semicircular top transition.

5. The voltage transformer for electric locomotive according to claim 1, characterized in that: Main shed skirts (11) are symmetrically arranged on the raised structures at the front and rear ends of the lower part of the main insulator (5).

6. The voltage transformer for electric locomotive according to claim 1, characterized in that: The front and rear sides of the lower part of the pagoda-shaped structure are symmetrically provided with auxiliary umbrella skirts (17) of arc structure, and the upper part of the pagoda-shaped structure is provided with a top umbrella skirt (10) of annular structure.

7. The voltage transformer for electric locomotive according to claim 1, characterized in that: The lower parts of the left and right side surfaces of the main insulator (5) are provided with grooves, and strip-shaped bottom umbrella skirts (19) are provided in the grooves.

8. The voltage transformer for electric locomotive according to claim 1, characterized in that: A base (6) is provided at the bottom of the main insulator (5), and a grounding terminal (9) is provided on the base (6) and is located at the rear side of the main insulator (5).

9. The voltage transformer for electric locomotive according to claim 1, characterized in that: The miniature circuit breaker assembly (12) comprises a housing (21), an upper cover (20), a miniature circuit breaker (22) and a guide rail (23), wherein the guide rail (23) is arranged at the bottom of the housing (21), the miniature circuit breaker (22) is slidably connected to the guide rail (23), the upper cover (20) is arranged at the top of the housing (21), and an assembly waterproof cable connector (13) connected to the miniature circuit breaker (22) is provided on the side wall of the housing (21).

10. The voltage transformer for electric locomotive according to claim 1, characterized in that: The main insulator (5) is cast with epoxy resin and the voltage device body to form an integrated structure.

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