Low-voltage voltage transformer with opening angle

Abstract

The utility model relates to the technical field of high-voltage measurement or relay protection equipment of an electric power system, in particular to a low-voltage voltage transformer with an opening angle. Comprising iron cores, a coil, a base, an upper clamping piece and wiring assemblies, the two iron cores are sleeved with the coil, the bottoms of the two iron cores are connected with the base, the tops of the two iron cores are connected with the upper clamping piece, the front side and the rear side of the upper clamping piece are connected with the two wiring assemblies respectively, and the two wiring assemblies are provided with a secondary wiring terminal and a primary wiring terminal respectively. Each wiring assembly comprises a wiring frame and a connecting insert arranged on the wiring frame, the wiring frame is connected with the upper clamping piece, the secondary wiring terminal and the primary wiring terminal are arranged on the connecting inserts of the two wiring assemblies respectively, and the primary lead and the secondary lead of the coil are connected with the connecting inserts. The utility model has the advantages of small volume, novel structure, complete function, convenient installation, stable insulation, safe operation and easy maintenance, and can be widely used in cooperation with novel switch cabinets.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage measurement or relay protection equipment of an electric power system, in particular to a low-voltage voltage transformer with an opening angle. Background Art

[0002] Voltage transformers mainly play measurement and protection functions in power systems or electrical control systems. In order to realize the measurement and protection functions of power systems, voltage transformers with measurement and protection windings are usually used. At present, voltage transformers in low-voltage power systems generally only have measurement windings. Low-voltage power systems have problems such as unstable opening angle voltage, lack of relay protection function, and easy damage. In view of the urgent need to solve the current problems and adapt to the new low-voltage power system, it is urgent to provide a low-voltage voltage transformer with an opening angle. Utility Model Content

[0003] In view of the above problems, the purpose of the utility model is to provide a low-voltage voltage transformer with an opening angle to meet the needs of new power systems and solve the problems of unstable opening angle voltage, lack of relay protection function, and easy damage in low-voltage power systems.

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

[0005] The utility model provides a low-voltage voltage transformer with an opening angle, comprising an iron core, a coil, a base, an upper clamp and a wiring assembly, wherein the coil is sleeved on two iron cores to form a coil body, the bottom of the coil body is connected to the base, the top is connected to the upper clamp, the front and rear sides of the upper clamp are respectively connected to two groups of wiring assemblies, and the two groups of wiring assemblies are respectively provided with secondary wiring terminals and primary wiring terminals.

[0006] The wiring assembly includes a wiring frame and a connecting insert arranged on the wiring frame, wherein the wiring frame is connected to the upper clamp, the secondary wiring terminals and the primary wiring terminals are respectively arranged on the connecting inserts in the two groups of the wiring assemblies, and the primary lead and the secondary lead of the coil are connected to the connecting insert.

[0007] The wiring frame is made of ABS plastic material.

[0008] The upper clamp includes an upper clamp plate, the left and right sides of the upper clamp plate are provided with downwardly bent upper clamp outer arc edges, the middle part of the upper clamp plate is provided with two downwardly bent upper clamp inner arc edges, and the adjacent upper clamp plates and upper clamp inner arc edges are used to position the top of an iron core.

[0009] Two upper clamp connecting ear plates are respectively arranged on the front and rear sides of the upper clamp flat plate, and the two upper clamp connecting ear plates are used to connect the wiring assembly.

[0010] The base comprises a base body, the top left and right sides of the base body are provided with base outer arc edges that are bent upwards, the middle part of the base body is provided with two base inner arc edges that are bent upwards, and the adjacent base outer arc edges and base inner arc edges are used to position the bottom of the iron core;

[0011] Two base side plates are arranged on the front and rear sides of the base body, and the two base side plates are used to limit the front and rear sides of the two iron cores.

[0012] The coil includes an insulating frame, a secondary winding and a primary winding, wherein the insulating frame is a hollow cubic structure and an annular groove is provided on the side wall. The secondary winding and the primary winding are wound from the inside to the outside in the annular groove on the outside of the insulating frame, and the top of the insulating frame is provided with a plurality of threading holes for the primary lead and the secondary lead to pass through.

[0013] The upper clamp, the base and the two iron cores are fastened together through a throat hoop.

[0014] The iron core is a C-shaped coiled iron core with an opening in the middle.

[0015] The upper clamp and the base are both made of metal and are manufactured by one-step stamping.

[0016] The advantages and beneficial effects of the utility model are:

[0017] 1. Small size, novel structure, and complete functions: The coil and wiring rack, connecting insert, upper clamp, and base of the utility model are assembled by the throat clamp. The product structure is more novel and unique, the function is more complete, and it integrates measurement and protection in one, which is more suitable for the use of new low-voltage voltage transformers;

[0018] 2. Easy installation and maintenance: The connection insert of the utility model is designed to be embedded in the wiring rack. When the product is installed and used, it is only necessary to insert the transformer into the switch cabinet, connect it to the primary high-voltage line, and fix the bolts through the base holes, which effectively saves the assembly and maintenance time of the switch cabinet and does not require special maintenance work;

[0019] 3. Stable insulation and safe operation: The insulating skeleton of the utility model is made of vacuum varnish and the surface is coated with gray insulating paint, which makes the transformer insulation reliable and ensures the safe operation of the product. It avoids the occurrence of unstable opening angle voltage, lack of relay protection function and easy damage from the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of the low-voltage voltage transformer with an opening angle of the utility model;

[0021] Figure 2 It is a side view of the low-voltage voltage transformer with an opening angle of the utility model;

[0022] Figure 3 It is a structural schematic diagram of the insulating skeleton in the utility model;

[0023] Figure 4 for Figure 3 A top view of

[0024] Figure 5 This is the front view of the wiring rack in the utility model;

[0025] Figure 6 for Figure 5 Left view of

[0026] Figure 7 for Figure 5 A top view of

[0027] Figure 8 This is the front view of the base in the utility model;

[0028] Fig. 9 for Figure 8 Side view of

[0029] Fig.10 for Figure 8 A top view of

[0030] Fig.11 This is a front view of the upper clamp in the utility model;

[0031] Fig.12 for Fig.11 Top view of the .

[0032] In the figure: 1. iron core; 2. secondary winding; 3. primary winding; 4. insulating frame; 41. threading hole; 5. base; 51. base side plate; 52. base body; 53. outer arc edge of base; 54. base side limit plate; 55. inner arc edge of base; 6. secondary wiring terminal; 7. upper clamp; 71. upper clamp flat plate; 72. outer arc edge of upper clamp; 73. inner arc edge of upper clamp; 74. upper clamp connecting ear plate; 8. terminal frame; 9. connecting insert; 10. fixing screw; 11. throat clamp; 12. connecting screw. DETAILED DESCRIPTION

[0033] 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.

[0034] like Figure 1 , Figure 2As shown, the utility model provides a low-voltage voltage transformer with an opening angle, comprising an iron core 1, a coil, a base 5, an upper clamp 7 and a wiring assembly, wherein the coil is sleeved on two iron cores 1 to form a coil body, the bottom of the coil body is connected to the base 5, and the top is connected to the upper clamp 7, and the front and rear sides of the upper clamp 7 are respectively connected to two groups of wiring assemblies, and the two groups of wiring assemblies are respectively provided with secondary wiring terminals 6 and primary wiring terminals.

[0035] like Figure 1 , Figure 3 , Figure 4 As shown, in the embodiment of the utility model, the coil includes an insulating skeleton 4, a secondary winding 2 and a primary winding 3, wherein the insulating skeleton 4 is a hollow cubic structure, and an annular groove is provided on the side wall, the secondary winding 2 and the primary winding 3 are concentrically wound from the inside to the outside in the annular groove on the outside of the insulating skeleton 4, and a threading hole 41 is provided on the top of the insulating skeleton 4 to facilitate the wiring of the primary and secondary leads. The primary lead of the primary winding 3 and the secondary lead of the secondary winding 2 are led out from the threading hole 41 and are connected to the primary terminal and the secondary terminal 6 respectively. The cubic structure of the insulating skeleton 4 ensures that the insulation distance between the primary and secondary terminals to the ground is uniform. Specifically, the iron core 1 is a C-shaped coiled iron core with an opening in the middle, which is convenient for assembly.

[0036] like Figures 5 to 7 As shown, in the embodiment of the utility model, the wiring assembly includes a wiring frame 8 and a connecting insert 9 arranged on the wiring frame 8, wherein the wiring frame 8 is connected to the upper clamp 7, the secondary wiring terminals 6 and the primary wiring terminals are respectively arranged on the connecting inserts 9 in the two groups of wiring assemblies, and the primary lead wire and the secondary lead wire of the coil are connected to the connecting insert 9. Specifically, the wiring frame 8 is a plastic shell structure with partitions made of ABS plastic material, with unique wiring and more reliable insulation.

[0037] like Figures 8 to 10 As shown, in the embodiment of the utility model, the base 5 includes a base body 52, and the top left and right sides of the base body 52 are provided with base outer arc edges 53 that are bent upward, and the middle part of the base body 52 is provided with two base inner arc edges 55 that are bent upward, and the adjacent base outer arc edges 53 and base inner arc edges 55 are arranged oppositely, and are used to position the bottom two sides of an iron core 1. Further, two base side plates 51 are provided on the front and rear sides of the base body 52, and the two base side plates 51 are used to limit the front and rear sides of the two iron cores 1.

[0038] like Figure 11 to Figure 12As shown, in the embodiment of the utility model, the upper clamp 7 includes an upper clamp flat plate 71, and the left and right sides of the upper clamp flat plate 71 are provided with upper clamp outer arc edges 72 bent downward, and the middle part of the upper clamp flat plate 71 is provided with two upper clamp inner arc edges 73 bent downward, and the adjacent upper clamp flat plates 71 and upper clamp inner arc edges 73 are arranged relatively to each other, and are used to position the two sides of the top of an iron core 1.

[0039] Furthermore, two upper clamp connecting ear plates 74 are provided on the front and rear sides of the upper clamp flat plate 71 , and the two upper clamp connecting ear plates 74 are used to connect with the wiring frame 8 in the wiring assembly.

[0040] In the embodiment of the utility model, the upper clamp 7, the base 5 and the two cores 1 are fastened together by the throat clamp 11, and the structure is more solid. The upper clamp 7 and the base 5 are made of metal, and are made by stamping one-time molding. The contour design ensures the mechanical strength of the product during installation and use.

[0041] The utility model provides a low-voltage voltage transformer with an opening angle, and the assembly method thereof is as follows:

[0042] The secondary winding 2 and the primary winding 3 are concentrically wound on the insulating frame 4 by a winding device to form a coil, ensuring that the primary and secondary insulation distances to the ground are uniform. After vacuum varnishing, the core columns of the two iron cores 1 pass through the insulating frame 4 to form a coil body, which is placed on the base 5. The upper clamp 7 is set on the top. The upper clamp 7, the coil body and the base 5 are fastened and assembled by the throat clamp 11 to form a low-voltage voltage transformer with exposed iron core. The secondary winding 2 is inside the primary winding 3. The secondary winding 2 is divided into two windings, measurement and protection, which are wound in sequence. It can not only measure the line voltage, but also detect the problem of unbalanced voltage in the open triangle in the power line. The primary and secondary leads pass through the threading holes 41 on both sides of the insulating frame 4 and are connected to the connection inserts 9 on the wiring frame 8 to maintain reliable electrical connection.

[0043] When using the product, you only need to insert the transformer into the switch cabinet according to the phase sequence, fix the bolts through the base holes, tighten the fixing bolts of the primary wiring terminals, and connect the secondary wiring terminals. There is no need to install other electrical accessories. The voltage transformer assembly work is completed, which effectively saves the assembly time of the switch cabinet. The product is easier to overhaul and does not require special maintenance work.

[0044] The utility model of low-voltage voltage transformer with an opening angle is made of vacuum varnish and the surface is sprayed with gray insulating paint, so that the transformer is reliably insulated and the safe operation of the product is ensured. It is used for voltage measurement and protection, and the occurrence of failures caused by unstable voltage at the opening angle and lack of relay protection function is avoided from the structural point of view. The product adopts an exposed iron core structure, and the primary and secondary terminals are arranged symmetrically front and back using wiring racks. The primary and secondary wiring terminals are arranged on both sides of the iron core. The high and low voltage terminals of the product maintain a sufficient insulation distance. The product structure is more novel and unique, and the functions are more complete. It integrates measurement and protection. It has the advantages of small size, novel structure, complete functions, easy installation, stable insulation, safe operation, and easy maintenance. It can be widely used in new switch cabinets.

[0045] 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 low voltage voltage transformer with an opening angle, characterized in that: The invention comprises an iron core (1), a coil, a base (5), an upper clamp (7) and a wiring assembly, wherein the coil is sleeved on two iron cores (1) to form a coil body, the bottom of the coil body is connected to the base (5), and the top is connected to the upper clamp (7), the front and rear sides of the upper clamp (7) are respectively connected to two groups of wiring assemblies, and the two groups of wiring assemblies are respectively provided with secondary wiring terminals (6) and primary wiring terminals.

2. The low-voltage voltage transformer with an opening angle according to claim 1, characterized in that: The wiring assembly comprises a wiring frame (8) and a connecting insert (9) arranged on the wiring frame (8), wherein the wiring frame (8) is connected to the upper clamp (7), the secondary wiring terminals (6) and the primary wiring terminals are respectively arranged on the connecting inserts (9) in two groups of the wiring assembly, and the primary lead wire and the secondary lead wire of the coil are connected to the connecting insert (9).

3. The low-voltage voltage transformer with an opening angle according to claim 2, characterized in that: The wiring frame (8) is made of ABS plastic material.

4. The low-voltage voltage transformer with an opening angle according to claim 1, characterized in that: The upper clamp (7) comprises an upper clamp plate (71), the left and right sides of the upper clamp plate (71) are provided with upper clamp outer arc edges (72) bent downwards, the middle part of the upper clamp plate (71) is provided with two upper clamp inner arc edges (73) bent downwards, and the adjacent upper clamp plates (71) and upper clamp inner arc edges (73) are used to position the top of an iron core (1).

5. The low-voltage voltage transformer with an opening angle according to claim 4, characterized in that: Two upper clamping piece connecting ear plates (74) are provided on the front and rear sides of the upper clamping piece flat plate (71), and the two upper clamping piece connecting ear plates (74) are used to connect the wiring assembly.

6. The low-voltage voltage transformer with an opening angle according to claim 1, characterized in that: The base (5) comprises a base body (52), the top left and right sides of the base body (52) are provided with base outer arc edges (53) that are bent upwards, the middle part of the base body (52) is provided with two base inner arc edges (55) that are bent upwards, and the adjacent base outer arc edges (53) and base inner arc edges (55) are used to position the bottom of the iron core (1); Two base side plates (51) are provided on the front and rear sides of the base body (52), and the two base side plates (51) are used to limit the front and rear sides of the two iron cores (1).

7. The low-voltage voltage transformer with an opening angle according to claim 1, characterized in that: The coil comprises an insulating frame (4), a secondary winding (2) and a primary winding (3), wherein the insulating frame (4) is a hollow cubic structure and an annular groove is provided on the side wall, the secondary winding (2) and the primary winding (3) are wound from the inside to the outside in the annular groove on the outside of the insulating frame (4), and the top of the insulating frame (4) is provided with a plurality of threading holes (41) for the primary lead wire and the secondary lead wire to pass through.

8. The low-voltage voltage transformer with an opening angle according to claim 1, characterized in that: The upper clamp (7), the base (5) and the two iron cores (1) are fastened together via a throat clamp (11).

9. The low-voltage voltage transformer with an opening angle according to claim 1, characterized in that: The iron core (1) is a C-shaped coiled iron core with an opening in the middle.

10. The low-voltage voltage transformer with an opening angle according to claim 1, characterized in that: The upper clamp (7) and the base (5) are both made of metal and are manufactured by one-step stamping.

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