Elbow head base grounding type voltage transformer
By designing a compact elbow ground -seat grounding voltage transformer, the existing voltage transformers occupy the problem of large space and tedious installation and maintenance, and realize multiple advantages such as miniaturization, easy installation and high insulation.
Patent Information
- Application Number
- CN202420204944.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-29
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-01-29
AI Technical Summary
The existing voltage transformers take up a large space, are cumbersome to install and maintain, and lack grounding products with high voltage safety function.
Design a kind of elbow -seat grounding voltage transformer, adopts American elbow connection, compact structure, built -in high -voltage fuse, the main insulation is poured by epoxy resin materials, and semi -conductive paint is sprayed on the outer surface. Essence
A voltage transformer with small volume, light weight, and fully functional function, easy to install, easy maintenance, stable insulation, small bureau volume, safe operation, and self -current limit protection function.
Smart Images
Figure CN222421536U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to high-voltage measurement or relay protection equipment for an electric power system, in particular to an elbow-seat grounding type voltage transformer. Background Art
[0002] Voltage transformers are devices for measuring voltage and electric energy in power systems or electrical control systems. The products must have their own high-voltage fuse function to meet the requirements of supporting automation equipment. However, there are currently no grounding products with this performance in the industry. Although existing dry-type products can be equipped with additional fuse devices, this will cause the overall structure to be too large and increase equipment costs, while adding a lot of difficulties to later equipment maintenance. Ordinary voltage transformers have the disadvantages of large size, complex installation, and maintenance requirements, so the switch cabinets produced in conjunction with them also have the defects of large size and high cost. Utility Model Content
[0003] In view of the above problems, the purpose of the utility model is to provide an elbow-grounded voltage transformer to solve the problems of the existing voltage transformer that it occupies a large space and has complicated installation and maintenance.
[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0005] The utility model provides an elbow-seat grounded voltage transformer, comprising a mounting base, a main insulator and a voltage body, wherein the voltage body is sealed in the main insulator, a layer of semi-conductive paint is sprayed on the outer surface of the main insulator, the main insulator is arranged on the mounting base, a primary elbow is arranged at the front of the top of the main insulator, the primary elbow is arranged along the front-to-back direction, and the front end extends to the outside of the main insulator, the primary elbow is provided with an inner cavity for installing a primary high-voltage fuse, a primary terminal is provided at the bottom of the inner cavity along the depth direction, a shielding structure is provided at the front of the inner cavity of the primary elbow, a secondary wiring platform with a lateral opening is provided at the bottom of the front end of the main insulator, the lateral opening of the secondary wiring platform is sealed by a secondary cover plate, and a secondary wiring terminal is provided in the secondary wiring platform.
[0006] The shielding structure includes a shielding ring and a primary terminal shielding net which are concentrically arranged and have an insulation distance. The shielding ring is made of an embedded nut welded on a metal ring and sprayed with semi-conductive paint on the outside, wherein the metal ring is located in the middle of the inner cavity of the primary elbow, and the end of the embedded nut is exposed to the outside of the main insulator and in contact with the semi-conductive paint; the primary terminal shielding net includes a cylindrical wire mesh and an annular metal part connected to the end of the cylindrical wire mesh, an annular groove is provided on the outer circumference of the annular metal part, the cylindrical wire mesh is located at the front end of the inner cavity of the primary elbow, and the annular metal part is exposed to the outside of the front end of the primary elbow.
[0007] The front part of the primary elbow is in the shape of a truncated cone, the rear part of the primary elbow is a semi-cylindrical protrusion located on the top of the main insulator, and the rear end of the semi-cylindrical protrusion transitions to the main insulator through an inclined surface.
[0008] A primary high-voltage fuse is sealed in the inner cavity of the primary elbow, one end of the primary high-voltage fuse is in contact with the primary terminal through a spring, and the other end is connected to a primary high-voltage cable plug; the front end surface of the main insulator is provided with buckles on both sides of the primary elbow, and the buckles are used to fix the primary high-voltage cable plug.
[0009] The voltage device body includes a primary winding, a secondary winding and an iron core, 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 wound in stages, and a layer of electrostatic screen is wound outside each coil, and the width of each electrostatic screen is greater than the width of the insulating paper between the layers of that stage.
[0010] The electrostatic screen is made of capacitor composite paper with silicone strips sandwiched on both sides and covered with semi-conductive crepe paper. The electrostatic screen is thin in the middle and has circular protrusions on both sides.
[0011] The main insulator is cast with epoxy resin and the voltage body as an integral structure. The main insulator is a cubic structure, and grooves are symmetrically arranged near the bottom on the left and right sides. The grooves are through the front and back directions. The top surface of the main insulator and the left and right sides are transitioned through side slopes, and the top surface of the main insulator and the rear side are transitioned through rear end slopes. A layer of semi-conductive paint is sprayed on the outer surface of the main insulator.
[0012] A primary grounding N terminal is arranged in the secondary wiring board.
[0013] A grounding terminal is arranged beside the secondary wiring platform, and the grounding terminal is arranged on the installation bottom plate. A wire protection clamp nut is arranged at the secondary outlet position of the secondary wiring platform, and the wire protection clamp nut is threadedly connected to the wire protection clamp.
[0014] The utility model has the following advantages and beneficial effects:
[0015] 1. Small size, light weight, full functions: This utility model adopts American elbow connection, compact structure, small size, full functions, optimized structural design, especially suitable for the use of new grounding voltage transformer supporting switch cabinet;
[0016] 2. Easy installation and maintenance: When installing and using the utility model, you only need to install the transformer in the switch cabinet according to the phase sequence, which effectively saves the assembly time of the switch cabinet; the product maintenance is simpler and no special maintenance work is required;
[0017] 3. Stable insulation, small partial discharge and safe operation: The utility model is integrally cast with epoxy resin material, and the insulation is reliable; the primary terminal is equipped with a shielding ring, a primary terminal shielding net, an electrostatic screen and a semi-conductive paint, which work together to achieve a better shielding effect and small partial discharge; the primary high-voltage terminal elbow seat fully sealed design effectively reduces the size of the switch cabinet, effectively avoids many quality risks from the design, and ensures safer operation.
[0018] 4. Self-current limiting protection and integrated elbow seat: The primary high-voltage terminal of the utility model adopts an American elbow connection, which is fixed and sealed reliably. The high-voltage current limiting fuse is concentrically installed inside the elbow, which is fully insulated and sealed, and is easy to install and replace. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is the internal structure diagram of a elbow-type grounding voltage transformer of the utility model.
[0020] Figure 2 This is a front view of an elbow-type grounding voltage transformer of the utility model;
[0021] Figure 3 for Figure 2 Left view of;
[0022] Figure 4 for Figure 2 Top view of the .
[0023] In the figure: 1. primary winding; 2. electrostatic screen; 3. voltage body; 4. main insulator; 5. secondary terminal block; 6. mounting base plate; 7. secondary terminal; 8. grounding terminal; 9. secondary cover plate; 10. primary terminal; 11. shielding ring; 12. embedded nut; 13. primary terminal shielding net; 14. wire clamp nut; 15. wire clamp; 16. rear end inclined surface; 17. primary elbow; 18. spring; 19. semi-cylindrical protrusion; 20. buckle; 21. groove. DETAILED DESCRIPTION
[0024] 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.
[0025] like Figure 1-4As shown, the utility model provides an elbow-seat grounded voltage transformer, comprising a mounting base plate 6, a main insulator 4 and a voltage body 3, wherein the voltage body 3 is sealed in the main insulator 4, a layer of semi-conductive paint is sprayed on the outer surface of the main insulator 4, the main insulator 4 is arranged on the mounting base plate 6, a primary elbow 17 is provided at the front of the top of the main insulator 4, the primary elbow 17 is arranged along the front-to-back direction, and the front end extends to the outside of the main insulator 4, the primary elbow 17 is provided with an inner cavity for installing a primary high-voltage fuse, a primary terminal 10 is provided at the bottom of the inner cavity along the depth direction, a shielding structure is provided at the front of the inner cavity of the primary elbow 17, a secondary wiring station 5 with a lateral opening is provided at the bottom of the front end of the main insulator 4, the lateral opening of the secondary wiring station 5 is sealed by a secondary cover plate 9, and a secondary wiring terminal 7 is provided in the secondary wiring station 5.
[0026] like Figures 1 to 4 As shown, in the embodiment of the utility model, the front part of the primary elbow 17 is in the shape of a frustum, the rear part of the primary elbow 17 is a semi-cylindrical protrusion 19 located on the top of the main insulator 4, and the rear end of the semi-cylindrical protrusion 19 transitions to the main insulator 4 through an inclined surface.
[0027] like Figure 1 As shown, in an embodiment of the utility model, the shielding structure includes a shielding ring 11 and a primary terminal shielding net 13 which are concentrically arranged and have an insulation distance. The shielding ring 11 is formed by welding an embedded nut 12 on a metal ring and spraying a semi-conductive paint on the outside, wherein the metal ring is located in the middle of the inner cavity of the primary elbow 17, and the end of the embedded nut 12 is exposed to the outside of the main insulator 4 and is in contact with the semi-conductive paint; the primary terminal shielding net 13 includes a cylindrical wire mesh and an annular metal part connected to the end of the cylindrical wire mesh, an annular groove is provided on the outer circumference of the annular metal part, the cylindrical wire mesh is located at the front end of the inner cavity of the primary elbow 17, and the annular metal part is exposed to the outside of the front end of the primary elbow 17.
[0028] In the embodiment of the utility model, a primary high-voltage fuse is sealed in the inner cavity of the primary elbow 17, one end of the primary high-voltage fuse is in contact with the primary terminal 10 through a spring 18, and the other end is connected to a primary high-voltage cable plug; the front end surface of the main insulator 4 is provided with buckles 20 on both sides of the primary elbow 17, and the buckles 20 are used to fix the primary high-voltage cable plug, such as Figure 3 shown.
[0029] like Figure 1 As shown, in the embodiment of the utility model, the voltage body 3 includes a primary winding 1, a secondary winding and an iron core, wherein the secondary winding and the primary winding 1 are concentrically wound on the iron core from the inside to the outside, the primary winding 1 is graded, and a layer of electrostatic screen 2 is wound around the outside of each coil, and the width of each electrostatic screen 2 is greater than the width of the insulating paper between the layers of that level.
[0030] Specifically, the electrostatic screen 2 is made of capacitor composite paper with silicone strips sandwiched on both sides and covered with semi-conductive crepe paper. The electrostatic screen 2 is thin in the middle and has circular protrusions on both sides.
[0031] like Figures 1 to 4 As shown, in the embodiment of the utility model, the main insulator 4 is cast with epoxy resin and the voltage body 3 as an integrated structure. The main insulator 4 is a cubic structure, and grooves 21 are symmetrically provided near the bottom on the left and right sides. The grooves 21 are through in the front-to-back direction. The top surface of the main insulator 4 and the left and right sides are transitioned through the side bevels, and the top surface of the main insulator 4 and the rear side are transitioned through the rear bevel 16. Preferably, the width of the rear bevel 16 is greater than the width of the side bevel. The main insulator 4 is evenly sprayed with a layer of semi-conductive paint except for the inner and outer surfaces of the primary elbow 17 and the inner cavity of the secondary terminal 5, and the semi-conductive paint is in contact with the embedded nut 12.
[0032] Furthermore, a primary grounding N terminal is provided inside the secondary wiring station 5 to facilitate the grounding of the primary low-voltage terminal. A grounding terminal 8 is provided next to the secondary wiring station 5, and the grounding terminal 8 is provided on the mounting base plate 6 to facilitate the grounding of the base plate. A wire clamp nut 14 is provided at the secondary outlet position of the secondary wiring station 5, and the wire clamp nut 14 is threadedly connected to the wire clamp 15, such as Figures 2 to 4 shown.
[0033] The utility model provides an elbow-seat grounding voltage transformer, the manufacturing process of which is as follows:
[0034] The primary winding 1 and the secondary winding are concentrically wound on an insulating frame. The primary winding 1 is wound in stages, and each stage of the winding is added with a layer of electrostatic screen 2. The electrostatic screen 2 includes a capacitor composite paper with silicone strips on both sides and a semi-conductive corrugated paper wrapped outside. The electrostatic screen 2 is wound outside each stage of the winding. The width of each stage of the electrostatic screen 2 is greater than the width of the insulating paper between the layers of the stage to shield the high-voltage electric field of the layer. After the primary and secondary windings are wound, they are mounted on the iron core column, and after the iron core is assembled, insulated and buffered, the voltage body 3 is formed and then fixed in the casting mold. The shielding ring 11 and the primary terminal shielding net 13 are fixed. The shielding ring 11 and the primary terminal shielding net 13 are concentric and have an insulation distance between them. The shielding ring 11 is made of an embedded nut 12 welded on a circular ring and sprayed with semi-conductive paint. The primary terminal shielding net 13 is a circular metal part with a cylindrical iron wire mesh connected to the end and spot welded to shield the high-voltage electric field at the fuse end. The shielding ring 11, the electrostatic screen 2, the primary terminal shielding net 13 and the semi-conductive paint on the outer surface of the main insulator 4 work together to shield the high and low voltage electric fields, realize the effective shielding of the high and low voltage electric fields, make the electric field uniform, and reduce the amount of local discharge; then fix the primary and secondary winding inserts, adjust the insulation distance, and use epoxy resin vacuum casting and curing to form the main insulator 4. The outer surface of the main insulator 4, except for the inner and outer surfaces of the primary elbow 17 and the inner cavity of the secondary wiring station 5, is evenly sprayed with a layer of semi-conductive paint, and the semi-conductive paint is in contact with the embedded nut 12, so that the voltage on the surface of the voltage transformer is close to zero, and the surface of the voltage transformer can be safely contacted, ensuring that the voltage transformer can operate safely. The main insulator 4 is finally installed as a whole on a mounting base plate 6; the primary terminal is in the shape of a primary elbow 17, and transitions to the main insulator 4 along the rear end slope of the semicircle 19. The main insulator 4 is in the shape of a square as a whole, with a compact structure and a small size; the end of the primary elbow 17 is provided with a ring-shaped metal part with a groove, which is convenient for clamping with the matching primary high-voltage cable plug, making wiring more convenient, ensuring effective electrical contact with the primary high-voltage connecting line, and ensuring that the whole has sufficient mechanical strength; the primary elbow 17 is a hollow frustum structure, and a primary high-voltage fuse for connecting to the high-voltage cable is sealed inside it. After the primary high-voltage fuse is reliably in contact with the high-voltage cable through the spring 18, it effectively protects the product from damage when a system failure occurs. Buckles 20 are provided on both sides of the primary elbow 17, which are used as fixing parts after the high-voltage cable plug is tightly plugged into the primary elbow 17, facilitating the layout design of the high-voltage cable plug and the high-voltage cable. The secondary wiring station 5 is protruded and located at the lower side of the main insulator 4. The secondary wiring terminal 12 is located inside the secondary wiring station 5 and is fixed by a secondary cover plate 8. The secondary cover plate 8 is made of metal material and, after being matched with a sealing gasket, ensures that the secondary wiring station 5 is reliably sealed and has a waterproof function. A wire protection clamp nut 14 is provided at the secondary outlet position, and a wire protection clamp 15 with a waterproof external cable fixing is threadedly connected to ensure that the secondary cable is reliably sealed and clamped after the secondary cable wiring is completed.The top three sides of the main insulator 4 are inclined, which can effectively prevent long-term accumulation of dirt. The grooves on both sides are connected to form a square shape to increase the creepage distance to the ground surface. The overall structural layout ensures uniform insulation distance and balanced distribution of high and low voltage electric fields. The sealed secondary terminal 5 is located at the front end of the integrated structure and biased to the lower part, which increases the insulation distance of the primary terminal to the ground and facilitates secondary wiring.
[0035] When in use, first use the voltage transformer installation base plate 6 to install the voltage transformer on the switch cabinet chassis in sequence according to the phase sequence, then connect the fixed end of the primary high-voltage fuse to the primary cable plug, and then insert it into the primary elbow 17 of the transformer. After reliable contact through the spring 18, use the primary cable plug fixing piece and the metal clamp and buckle 20 to position and fix the primary cable plug. The primary grounding N end and the grounding terminal 8 are grounded together, and finally the secondary line cable is connected to the secondary terminal 7, and the secondary cover plate 9 is installed. The assembly of the elbow-grounded voltage transformer is completed.
[0036] The utility model provides an elbow-type grounding voltage transformer, which is a new product designed in full accordance with national standards and switch cabinet technical requirements. It adopts a rolled iron core and uses the electromagnetic conversion principle to enable the secondary voltage to accurately reflect the change of the primary voltage, and is used as voltage measurement and relay protection. The utility model is made of epoxy resin vacuum casting. The product has the characteristics of small size, flexible installation, stable insulation, full sealing, and maintenance-free. The elbow-type structure realizes the main functions of the ring network cabinet, such as full insulation, full sealing, small size, compact structure, fuse protection, flexible installation, maintenance-free, and safe operation, which makes the quality level of the power system ring network power supply technology take a bigger step forward.
[0037] 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. An elbow-grounded voltage transformer, characterized in that: The invention comprises a mounting base plate (6), a main insulator (4) and a voltage body (3), wherein the voltage body (3) is sealed in the main insulator (4), a layer of semi-conductive paint is sprayed on the outer surface of the main insulator (4), the main insulator (4) is arranged on the mounting base plate (6), a primary elbow (17) is arranged at the front of the top of the main insulator (4), the primary elbow (17) is arranged in the front-to-back direction, and the front end extends to the outside of the main insulator (4), the primary elbow (17) is provided with an inner cavity for installing a primary high-voltage fuse, the bottom of the inner cavity along the depth direction is provided with a primary terminal (10), the front part of the inner cavity of the primary elbow (17) is provided with a shielding structure, the front bottom of the front end of the main insulator (4) is provided with a secondary wiring platform (5) with a lateral opening, the lateral opening of the secondary wiring platform (5) is sealed by a secondary cover plate (9), and a secondary wiring terminal (7) is provided in the secondary wiring platform (5).
2. The elbow-type grounding voltage transformer according to claim 1, characterized in that: The shielding structure comprises a shielding ring (11) and a primary terminal shielding net (13) which are concentrically arranged and have an insulation distance; the shielding ring (11) is formed by welding an embedded nut (12) on a metal ring and spraying a semi-conductive paint on the outside, wherein the metal ring is located in the middle of the inner cavity of the primary elbow (17), and the end of the embedded nut (12) is exposed to the outside of the main insulator (4) and is in contact with the semi-conductive paint; the primary terminal shielding net (13) comprises a cylindrical wire mesh and an annular metal part connected to the end of the cylindrical wire mesh, an annular groove is provided on the outer circumference of the annular metal part, the cylindrical wire mesh is located at the front end of the inner cavity of the primary elbow (17), and the annular metal part is exposed to the outside of the front end of the primary elbow (17).
3. The elbow-type grounding voltage transformer according to claim 1, characterized in that: The front part of the primary elbow (17) is in the shape of a truncated cone, the rear part of the primary elbow (17) is a semi-cylindrical protrusion (19) located at the top of the main insulator (4), and the rear end of the semi-cylindrical protrusion (19) transitions to the main insulator (4) through an inclined surface.
4. The elbow-type grounding voltage transformer according to claim 1, characterized in that: A primary high-voltage fuse is sealed in the inner cavity of the primary elbow (17); one end of the primary high-voltage fuse contacts the primary terminal (10) via a spring (18), and the other end is connected to a primary high-voltage cable plug; the front end surface of the main insulator (4) is provided with buckles (20) on both sides of the primary elbow (17), and the buckles (20) are used to fix the primary high-voltage cable plug.
5. The elbow-type grounding voltage transformer according to claim 1, characterized in that: The voltage device body (3) comprises a primary winding (1), a secondary winding and an iron core, wherein the secondary winding and the primary winding (1) are concentrically wound on the iron core from the inside to the outside, the primary winding (1) is wound in stages, and a layer of electrostatic screen (2) is wound outside each stage of the coil, and the width of each stage of the electrostatic screen (2) is greater than the width of the insulating paper between the layers of that stage.
6. The elbow-type grounding voltage transformer according to claim 5, characterized in that: The electrostatic screen (2) is made of capacitor composite paper with silicone strips sandwiched on both sides and covered with semi-conductive crepe paper. The electrostatic screen (2) is in the shape of a thin middle and circular protrusions on both sides.
7. The elbow-type grounding voltage transformer according to claim 1, characterized in that: The main insulator (4) is cast with epoxy resin and the voltage body (3) to form an integrated structure. The main insulator (4) is a cubic structure, and grooves (21) are symmetrically provided on the left and right sides near the bottom. The grooves (21) are through-through in the front-to-back direction. The top surface of the main insulator (4) and the left and right sides are transitioned through side bevels. The top surface of the main insulator (4) and the rear side are transitioned through a rear end bevel (16). A layer of semi-conductive paint is sprayed on the outer surface of the main insulator (4).
8. The elbow-type grounding voltage transformer according to claim 1, characterized in that: The secondary wiring station (5) is provided with a primary grounding N terminal.
9. The elbow-type grounding voltage transformer according to claim 1, characterized in that: A grounding terminal (8) is arranged beside the secondary wiring platform (5), and the grounding terminal (8) is arranged on the installation base plate (6).
10. The elbow-type grounding voltage transformer according to claim 1, characterized in that: A wire protection clamp nut (14) is provided at the secondary outlet position of the secondary wiring platform (5), and the wire protection clamp nut (14) is threadedly connected to the wire protection clamp (15).