All-insulation contact finger type single-phase voltage transformer with fuse

Abstract

The utility model relates to high-voltage measurement or relay protection equipment of an electric power system, in particular to an all-insulation contact finger type single-phase voltage transformer with a fuse. Comprising a main insulator and a transformer body sealed in the main insulator, the top of the main insulator is provided with a transversely arranged insulating cylinder, a fuse is sealed in the insulating cylinder, one end of the fuse is connected with a primary lead of the transformer body, and the end part of the insulating cylinder is provided with a contact finger device in contact with the other end of the fuse. The utility model has the advantages of small volume, large capacity, reasonable structure, flexible installation, easy maintenance and reliable insulation, and can be widely used in cooperation with novel switch cabinets and old-fashioned switch cabinets.

Description

Technical Field

[0001] The utility model relates to high-voltage measurement or relay protection equipment for an electric power system, in particular to a fully insulated finger-type single-phase voltage transformer with a fuse. Background Art

[0002] Voltage transformer is a device for measuring voltage and electric energy in power system or electrical control system. In order to realize miniaturization of switch cabinet and convenient overhaul and maintenance, voltage transformer switch cabinet is usually adopted. The existing voltage transformer switch cabinet is mainly composed of cabinet body, single-phase voltage transformer, insulating pillar, external fuse, contact arm, plum blossom contact, etc. There are many components, complex installation, complicated overhaul, many quality control points, high cost, unreliable insulation and other problems. Utility Model Content

[0003] In view of the above problems, the purpose of the utility model is to provide a fully insulated finger-type single-phase voltage transformer with fuse to meet the needs of new switch cabinets and solve the problems of existing voltage transformer switch cabinets with many components, complex installation, complicated maintenance, many quality control points and high cost.

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

[0005] The utility model provides a fully insulated contact finger type single-phase voltage transformer with a fuse, comprising a main insulator and a voltage device body sealed in the main insulator, a transversely arranged insulating cylinder is provided on the top of the main insulator, a fuse is sealed in the insulating cylinder, one end of the fuse is connected to a primary lead of the voltage device body, and a contact finger device contacting the other end of the fuse is provided at the end of the insulating cylinder.

[0006] A fuse top plate is provided at the blind end of the insulating cylinder. The fuse top plate is wrapped around one end of the fuse, and a threading hole is provided at the center of the fuse top plate.

[0007] A shielding net is arranged between the outer surface of the fuse and the inner wall of the insulating cylinder.

[0008] The finger contact device includes a finger contact lock bolt, a finger contact lock shell, a spring and a finger contact lock head, wherein one end of the finger contact lock shell is fixedly connected to the finger contact lock bolt, and the other end is slidably connected to the finger contact lock head, the spring is accommodated in the finger contact lock shell, and the two ends are respectively abutted against the finger contact lock head and the finger contact lock bolt, the finger contact lock shell is connected to the end of the insulating cylinder, and the finger contact lock bolt is in contact with the fuse.

[0009] The contact finger lock bolt is threadedly connected to the contact finger lock housing, and the contact finger lock housing is connected to the insulating cylinder through a threaded sleeve bolt.

[0010] The insulating cylinder is a cantilever structure extending forward horizontally, and the cantilever section of the insulating cylinder is cylindrical, and the rear portion of the insulating cylinder located above the main insulator is a square structure.

[0011] The insulating cylinder and the main insulator are an integrated structure cast by epoxy resin. The main insulator is a rectangular parallelepiped structure with grooves provided at the lower left and right sides. A mounting base plate is provided at the bottom of the main insulator.

[0012] The voltage device body comprises an iron core, a secondary winding, a primary winding and an insulating frame, wherein the secondary winding is wound on the iron core, and the primary winding is wound on the insulating frame and then integrally sheathed on the outside of the secondary winding.

[0013] A primary N terminal is provided on the top of the main insulator, and the primary N terminal is connected to a primary lead of the primary winding.

[0014] A secondary connection platform is provided at the front bottom of the main insulator, and a secondary connection terminal of the secondary winding is embedded in the secondary connection platform. A secondary protective cover is provided above the secondary connection platform; a grounding terminal is provided at the rear bottom of the main insulator.

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

[0016] Small partial discharge and fuse protection: The utility model is provided with a shielding net on the outside of the fuse and a bowl-shaped fuse top plate at the rear end to shield the fuse within the high-voltage electric field, and the product has small partial discharge; once the fuse protection device is installed, the overcurrent phenomenon in the line can be effectively cut off, and the transformer is protected from damage.

[0017] Small size, large capacity, reasonable structure: The utility model adopts R-type C-shaped iron core, optimizes the structural design, and the product structure is more compact, small in size, large in capacity, and more suitable for supporting use with new switch cabinets;

[0018] Easy installation and maintenance: The primary wiring terminal of the utility model is set as a finger device. When the product is installed and used, it is only necessary to insert the transformer into the switch cabinet according to the phase sequence, without the need to install other numerous electrical accessories, which effectively saves the assembly time of the switch cabinet; the primary N terminal is set at the top of the product, which is convenient for grounding, making it easier to repair and no special maintenance work is required;

[0019] Stable insulation and safe operation: The utility model is integrally cast from epoxy resin material, with reliable insulation. It integrates the fuse and the contact device, saves a lot of electrical connection components, effectively avoids many quality risks in design, and ensures safer operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1This is a schematic diagram of the internal structure of a fully insulated finger-type single-phase voltage transformer with a fuse according to the utility model;

[0021] Figure 2 This is a front view of the external structure of a fully insulated finger-type single-phase voltage transformer with a fuse 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. insulation frame; 5. primary N terminal; 6. fuse top plate; 7. fuse; 8. contact device; 9. contact lock bolt; 10. contact lock shell; 11. spring; 12. contact lock head; 13. secondary protective cover; 14. secondary wiring platform; 15. installation base plate; 16. grounding terminal; 17. voltage body; 18. groove; 19. screw bolt; 20. main insulator; 21. shielding net; 22. insulation cylinder. 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 fully insulated contact finger type single-phase voltage transformer with fuse, comprising a main insulator 20 and a voltage body 17 sealed in the main insulator 20, a transversely arranged insulating cylinder 22 is provided on the top of the main insulator 20, a fuse 7 is sealed in the insulating cylinder 22, one end of the fuse 7 is connected to the primary lead of the voltage body 17, and a contact finger device 8 contacting the other end of the fuse 7 is provided at the end of the insulating cylinder 22.

[0027] like Figures 1 to 4 As shown, in the embodiment of the utility model, the insulating tube 22 and the main insulator 20 are an integrated structure cast by epoxy resin, the main insulator 20 is a rectangular structure with four oblique angles, and grooves 18 are provided at the lower left and right sides, and a mounting base plate 15 is provided at the bottom of the main insulator 20.

[0028] Furthermore, the insulating cylinder 22 is a cantilever structure extending horizontally forward, and the cantilever section of the insulating cylinder 22 is cylindrical, and the rear portion of the insulating cylinder 22 located above the main insulator 20 is a square structure.

[0029] like Figure 1As shown, in the embodiment of the utility model, a fuse top plate 6 is provided at the blind end of the insulating tube 22. The fuse top plate 6 is a bowl-shaped structure and is wrapped around one end of the fuse 7. A threading hole is provided in the center of the fuse top plate 6.

[0030] Furthermore, a shielding net 21 is provided between the outer surface of the fuse 7 and the inner wall of the insulating tube 22 .

[0031] like Figure 1 As shown, in the embodiment of the utility model, the finger contact device 8 includes a finger contact bolt 9, a finger contact lock shell 10, a spring 11 and a finger contact lock head 12, wherein one end of the finger contact lock shell 10 is fixedly connected to the finger contact bolt 9, and the other end is slidably connected to the finger contact lock head 12. Specifically, one end of the finger contact lock head 12 is slidably connected to the inner wall of the finger contact lock shell 10, and the other end is passed through the finger contact lock shell 10. The spring 11 is accommodated in the finger contact lock shell 10, and the two ends are respectively abutted against the finger contact lock head 12 and the finger contact bolt 9, the finger contact lock shell 10 is connected to the end of the insulating cylinder 22, and the finger contact bolt 9 is in contact with the fuse 7.

[0032] Specifically, the contact finger lock bolt 9 is threadedly connected to the contact finger lock housing 10, and the contact finger lock housing 10 is threadedly connected to the insulating cylinder 22 through the threaded sleeve bolt 19, so as to achieve flexible wiring with the high-voltage end of the switch cabinet.

[0033] like Figure 1 As shown, in the embodiment of the utility model, the voltage body 17 includes an iron core 1, a secondary winding 2, a primary winding 3 and an insulating frame 4, wherein the secondary winding 2 is wound on the iron core 1, and the primary winding 3 is wound on the insulating frame 4 and then integrally sheathed on the outside of the secondary winding 2. Preferably, the iron core 1 is an R-type C-type iron core.

[0034] Furthermore, a primary N terminal 5 is provided on the top of the main insulator 20, and the primary N terminal 5 is connected to the primary lead of the primary winding 3. Specifically, the primary N terminal 5 is located at the rear end of the insulating cylinder 22 and is lower than the insulating cylinder 22, so as to facilitate the grounding of the primary N terminal.

[0035] Furthermore, a secondary terminal block 14 is provided at the front bottom of the main insulator 20 , and a secondary terminal block 14 is embedded with a secondary terminal of the secondary winding 2 . A secondary protective cover 13 is provided on the secondary terminal block 14 . A grounding terminal 16 is provided at the rear bottom of the main insulator 20 .

[0036] The utility model provides a fully insulated finger-type single-phase voltage transformer with a fuse, and the preparation process thereof is as follows:

[0037] The secondary winding 2 and the primary winding 3 are concentrically wound on the core column of the iron core 1 using a special winding device, and after insulation and buffering wrapping, the voltage body 17 is formed. After vacuum drying, the voltage body 17 is fixed in the casting mold using embedded nuts and iron core clamps, and then the primary winding terminal and the mold core mold are connected, and then the secondary wiring is connected, and the insulation distance is adjusted. It is formed by vacuum casting and curing with epoxy resin, and finally installed as a whole on a mounting base plate 15; then it becomes: the main insulator 20 is symmetrical, and the front end of the insulating cylinder 22 that seals the primary fuse 7 is cylindrical, and the rear end transitions to a square horizontal arrangement. It is not only used as the installation insulation of the fuse 7 to ensure that there is a uniform electric field around it, but also the main insulating transition piece of the primary terminal, with sufficient mechanical strength. The insulating cylinder 22 has a built-in fuse 7, and a shielding net 21 is arranged on the outside of the fuse 7. The fuse top plate 6 is arranged at the rear end to shield the high-voltage electric field of the fuse 7, and the product has a small partial discharge. The main insulator 20 is symmetrical, and square grooves 18 are provided at the bottom of the left and right sides to ensure uniform insulation distance and facilitate handling. The secondary wiring platform 14 is located in the center of the lower front part, which is convenient for secondary wiring arrangement during use and fixed lead-out of secondary lead cables; the bottom of the main insulator 20 is connected to the mounting base plate 15, and the bottom of the rear side of the main insulator 20 is provided with a grounding terminal 16, which is convenient for grounding, further improving the electrical insulation distance and the insulation distance relative to the ground, and improving the level of insulation products; a secondary protective cover 13 is provided on the top of the secondary wiring platform 14, which has dustproof and waterproof functions. The secondary protective cover 13 is made of transparent material and has lead-sealed screws on it, which has the purpose of preventing electricity theft.

[0038] When in use, first install the fuse 7 into the insulating tube 22, then fix the assembled nut bolt 19 to the front end of the insulating tube 22, use the mounting base plate 15 of the transformer to install it on the chassis of the switch cabinet according to the phase sequence according to the design, the finger device 8 is in close contact according to the phase sequence, and finally the secondary line cable is connected, and the secondary anti-theft protection cover is installed, and the assembly of the grounding voltage transformer with fuse is completed.

[0039] The fully insulated finger-type single-phase voltage transformer with fuse provided by the utility model is a new product designed in full accordance with national standards and technical requirements of voltage transformer switch cabinets. It adopts rolled R-type C-shaped iron core and uses the electromagnetic conversion principle to make the secondary voltage accurately reflect the change of the primary voltage, and is used as voltage measurement and relay protection. The product is made of epoxy resin vacuum casting, and has the advantages of small size, large capacity, reasonable structure, flexible installation, easy maintenance, and reliable insulation. It can be widely used in new switch cabinets and old switch cabinets.

[0040] 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 fully insulated finger-type single-phase voltage transformer with fuse, characterized in that: The invention comprises a main insulator (20) and a voltage body (17) sealed in the main insulator (20), wherein a transversely arranged insulating cylinder (22) is provided on the top of the main insulator (20), a fuse (7) is sealed in the insulating cylinder (22), one end of the fuse (7) is connected to a primary lead of the voltage body (17), and a contact finger device (8) is provided at the end of the insulating cylinder (22) for contacting the other end of the fuse (7); A fuse top plate (6) is provided at the blind end of the insulating cylinder (22), the fuse top plate (6) is wrapped around one end of the fuse (7), and a threading hole is provided at the center of the fuse top plate (6); A shielding net (21) is provided between the outer surface of the fuse (7) and the inner wall of the insulating cylinder (22).

2. The fully insulated contact finger type single-phase voltage transformer with fuse according to claim 1, characterized in that: The finger contact device (8) comprises a finger contact bolt (9), a finger contact bolt housing (10), a spring (11) and a finger contact lock head (12), wherein one end of the finger contact bolt housing (10) is fixedly connected to the finger contact bolt (9), and the other end is slidably connected to the finger contact lock head (12); the spring (11) is accommodated in the finger contact bolt housing (10), and the two ends thereof are respectively in contact with the finger contact lock head (12) and the finger contact bolt (9); the finger contact bolt housing (10) is connected to the end of the insulating cylinder (22), and the finger contact bolt (9) is in contact with the fuse (7).

3. The fully insulated contact finger type single-phase voltage transformer with fuse according to claim 2, characterized in that: The finger lock bolt (9) is threadedly connected to the finger lock housing (10), and the finger lock housing (10) is connected to the insulating cylinder (22) via a threaded bolt (19).

4. The fully insulated contact finger type single-phase voltage transformer with fuse according to claim 1, characterized in that: The insulating cylinder (22) is a cantilever structure extending horizontally forward, and the cantilever section of the insulating cylinder (22) is cylindrical, and the rear portion of the insulating cylinder (22) located above the main insulator (20) is a square structure.

5. The fully insulated contact finger type single-phase voltage transformer with fuse according to claim 4, characterized in that: The insulating cylinder (22) and the main insulator (20) are an integrated structure cast with epoxy resin. The main insulator (20) is a rectangular parallelepiped structure with grooves (18) provided at the lower left and right sides. A mounting base plate (15) is provided at the bottom of the main insulator (20).

6. The fully insulated contact finger type single-phase voltage transformer with fuse according to claim 1, characterized in that: The voltage device body (17) comprises an iron core (1), a secondary winding (2), a primary winding (3) and an insulating frame (4), wherein the secondary winding (2) is wound on the iron core (1), and the primary winding (3) is wound on the insulating frame (4) and then integrally sheathed on the outside of the secondary winding (2).

7. The fully insulated contact finger type single-phase voltage transformer with fuse according to claim 6, characterized in that: A primary N terminal (5) is provided on the top of the main insulator (20), and the primary N terminal (5) is connected to a primary lead of the primary winding (3).

8. The fully insulated contact finger type single-phase voltage transformer with fuse according to claim 6, characterized in that: A secondary wiring platform (14) is provided at the front bottom of the main insulator (20), a secondary wiring terminal of the secondary winding (2) is embedded in the secondary wiring platform (14), and a secondary protective cover (13) is provided on the upper surface of the secondary wiring platform (14); a grounding terminal (16) is provided at the rear bottom of the main insulator (20).

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