Disc-type tap changer for single-phase on-column transformer

Abstract

The utility model provides a disc type tap changer for single -phase pole -on type transformer, including insulating seat and the rotating shaft of being located in the inside of insulating seat, the lower end edge of insulating seat is equipped with a group of fixed contact along the circumference interval, corresponding, the lower end of rotating shaft is equipped with the movable contact of using with fixed contact, the top of rotating shaft is equipped with operating handle, the upper end of insulating seat is equipped with gear disc, the lower end edge interval of insulating seat is equipped with two mounting arms, the end of mounting arm uses mounting plate, is equipped with mounting hole on mounting plate. When using, tap changer is installed on the transformer oil tank wall, the end of the outgoing line of high -low voltage winding is connected to the bottom terminal of high -low voltage bushing, and the intermediate part is disconnected to form two terminal crimps, and is fixed on the corresponding mounting plate through bolt, thereby make in the process of transformer transportation, the outgoing line of high -low voltage winding can be in stable position, and it is not easy to shake violently after stress and lead to breakage.

Description

Technical Field

[0001] This utility model relates to the field of tap changer technology, specifically to a disc tap changer for a single-phase pole-mounted transformer. Background Technology

[0002] A single-phase pole-mounted transformer is a transformer installed on a utility pole or tower to reduce the high voltage (usually 10kV or 20kV) of a power distribution line to a low voltage (usually 220V / 380V) that can be directly used by the user. A single-phase pole-mounted transformer mainly consists of the transformer body, oil tank, high-voltage and low-voltage bushings, and tap changers. The transformer body is immersed in an oil tank filled with transformer oil; it includes an iron core made of laminated silicon steel sheets, and high-voltage and low-voltage windings wound around the iron core. The high-voltage and low-voltage bushings are fixed to the oil tank cover and are used to connect the high-voltage and low-voltage windings inside the transformer to the external high-voltage and low-voltage lines. In existing technology, the leads of the high-voltage and low-voltage windings inside the transformer are directly connected to the bottom terminals of the high-voltage and low-voltage bushings. During the transportation of transformers, they are susceptible to vibration due to road conditions and other human factors. Since the leads are suspended, they are prone to breakage due to violent shaking after being subjected to vibration, which affects the subsequent use of the transformer. Utility Model Content

[0003] This invention provides a disc-type tap changer for single-phase pole-mounted transformers to overcome the aforementioned problems in the prior art. The disc-type tap changer for single-phase pole-mounted transformers of this invention improves upon existing disc-type tap changers by providing two mounting arms at the lower edge of the tap changer's insulating base, and mounting plates at the ends of these arms. In use, the tap changer is mounted on the transformer tank wall, and the ends of the high-voltage and low-voltage winding leads are connected to the bottom terminals of the high-voltage and low-voltage bushings, with the middle section disconnected to form two terminals, which are then bolted to the corresponding mounting plates. This ensures that during transformer transportation, the high-voltage and low-voltage winding leads remain in a stable position, preventing them from breaking due to violent shaking under stress.

[0004] The technical solution of this application is as follows:

[0005] A disc tap changer for a single-phase pole-mounted transformer includes an insulating base and a rotating shaft inside the insulating base. A set of fixed contacts is spaced circumferentially along the lower edge of the insulating base. Correspondingly, a moving contact for use with the fixed contacts is located at the lower end of the rotating shaft. An operating handle is located at the top of the rotating shaft. A position plate is located at the upper end of the insulating base. Two mounting members are spaced apart along the lower edge of the insulating base, used for mounting the leads of the high-voltage and low-voltage windings, respectively. Each mounting member includes a mounting arm fixed to the lower end of the insulating base and a mounting plate located at the end of the mounting arm. Mounting holes are provided on the mounting plate.

[0006] Compared with existing technologies, the disc-type tap changer for single-phase pole-mounted transformers of this invention improves upon existing disc-type tap changers. Two mounting arms are provided at the lower edge of the tap changer's insulating base, and mounting plates with mounting holes are provided at the ends of the mounting arms. In use, the tap changer is installed on the transformer tank wall, and the ends of the high-voltage and low-voltage winding leads are connected to the bottom terminals of the high-voltage and low-voltage bushings. The middle section is disconnected to form two terminals, which are then fixed to the corresponding mounting plates with bolts. This ensures that the high-voltage and low-voltage winding leads remain in a stable position during transformer transportation, preventing them from breaking due to violent shaking under stress.

[0007] As an optimization, in the aforementioned disc tap changer for a single-phase pole-mounted transformer, a partition is provided on the mounting arm, inside the mounting plate. This increases the creepage distance between the mounting plate and the stationary contacts, improves insulation strength, prevents creepage, and thus ensures the safe and reliable operation of the transformer.

[0008] As an optimization, in the aforementioned disc tap changer for a single-phase pole-mounted transformer, the mounting arm is Z-shaped, and both sides of the mounting arm fold inward to form reinforcing edges. This enhances the structural strength of the mounting arm. Furthermore, the two mounting arms are at an angle of 120–150°. This ensures a fixed height for the lead wires and reduces the lateral space occupied by the mounting components.

[0009] As an optimization, in the aforementioned disc-type tap changer for a single-phase pole-mounted transformer, the mounting plate is L-shaped, comprising two vertically distributed mounting portions, each with a mounting hole. This allows the lead wires to be fixed to the corresponding mounting portions according to actual wiring requirements. Furthermore, reinforcing ribs are provided on the concave surface of the mounting plate to increase its structural strength and rigidity.

[0010] As an optimization, in the aforementioned disc-type tap changer for a single-phase pole-mounted transformer, the mounting component is integrally formed with the insulating base. This results in a simpler structure and easier manufacturing.

[0011] As an optimization, in the aforementioned disc-type tap changer for a single-phase pole-mounted transformer, the tap position disc has a set of position holes spaced circumferentially, and correspondingly, the operating handle has a limiting pin that cooperates with the position holes. Thus, the operating handle can be limited by the cooperation of the limiting pin and the tap position disc, preventing damage to the tap changer due to incomplete or excessive shifting. Furthermore, the tap position disc is fitted over the insulating base and secured with a nut. This facilitates assembly and ensures high installation stability. Further, the inner circumferential surface of the tap position disc has a positioning protrusion, and correspondingly, the outer circumferential surface of the insulating base has a positioning groove. Therefore, when installing the tap position disc, aligning the positioning protrusion with the positioning groove, fitting the tap position disc over the insulating base, and then securing it with the nut makes operation very convenient. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a disc tap changer for a single-phase pole-mounted transformer in an embodiment of this application;

[0013] Figure 2 yes Figure 1 A schematic diagram of the bottom of the disc tap changer in the diagram;

[0014] Figure 3 This is a schematic diagram of the structure of the insulating base in the embodiments of this application;

[0015] Figure 4 This is an assembly diagram of the operating handle, rotating shaft, and moving contact in an embodiment of this application;

[0016] Figure 5 This is a schematic diagram of the gear shift panel in the embodiments of this application.

[0017] The markings in the attached diagram are as follows: 1-Insulating base, 101-Positioning groove; 2-Rotating shaft; 3-Fixed contact; 4-Moving contact; 5-Operating handle; 6-Gate plate, 61-Positioning protrusion, 601-Gate hole; 7-Mounting component, 71-Mounting arm, 72-Mounting plate, 73-Partition plate, 74-Reinforcing edge, 75-Reinforcing rib, 701-Mounting hole; 8-Limiting pin; 9-Nut. Detailed Implementation

[0018] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings, but this should not be construed as limiting the present utility model. Contents not described in detail in the following embodiments are all common knowledge in the art.

[0019] To prevent the high and low voltage winding leads from breaking due to shaking caused by external forces during the transportation of single-phase pole-mounted transformers, the applicant has improved the existing disc tap changer by installing two mounting brackets on the lower edge of the tap changer's insulating base to fix the high and low voltage winding leads in a stable position.

[0020] See Figures 1 to 4 The disc tap changer for a single-phase pole-mounted transformer of this application includes an insulating base 1 and a rotating shaft 2 disposed inside the insulating base 1. A set of fixed contacts 3 are spaced circumferentially along the lower edge of the insulating base 1. Correspondingly, a moving contact 4 for use with the fixed contacts 3 is disposed at the lower end of the rotating shaft 2. An operating handle 5 (which can be fixed with screws) is disposed at the top of the rotating shaft 2. A stop plate 6 is disposed at the upper end of the insulating base 1. Two mounting members 7 are spaced apart along the lower edge of the insulating base 1, respectively used for mounting the leads of the high-voltage and low-voltage windings. The mounting member 7 includes a mounting arm 71 fixed to the lower end of the insulating base 1 and a mounting plate 72 disposed at the end of the mounting arm 71. A mounting hole 701 is provided on the mounting plate 72. In use, the tap changer is installed on the transformer tank wall, and the ends of the leads of the high-voltage and low-voltage windings are respectively connected to the bottom terminals of the high-voltage and low-voltage bushings. The middle parts of the two leads are broken to form two terminals, which are fixed to the corresponding mounting plates 701 by bolts.

[0021] Example (see) Figure 3 and Figure 5 ):

[0022] In this embodiment, a partition 73 is provided on the mounting arm 71, located inside the mounting plate 72. This increases the creepage distance between the mounting plate 72 and the fixed contact 3, improves insulation strength, prevents creepage, and thus ensures the safe and reliable operation of the transformer.

[0023] In this embodiment, the mounting arm 71 is Z-shaped, and both sides of the mounting arm 71 are folded inward to form reinforcing edges 74. This enhances the structural strength of the mounting arm 71. Furthermore, the angle α between the two mounting arms 71 is 120°. On the one hand, this ensures a fixed height for the lead wire; on the other hand, it reduces the lateral space occupied by the mounting component 7.

[0024] In this embodiment, the mounting plate 72 is L-shaped and includes two vertically distributed mounting portions, each with a mounting hole 701. The lead wire can then be fixed to the corresponding mounting portion according to actual wiring requirements. Furthermore, the concave surface of the mounting plate 72 is provided with reinforcing ribs 75 to increase the structural strength and rigidity of the mounting plate.

[0025] In this embodiment, the mounting arm 71, mounting plate 72, partition 73, reinforcing edge 74, reinforcing rib 75, and insulating base 1 are integrally formed. This results in a simple structure that is easy to manufacture.

[0026] In this embodiment, the lower edge of the insulating base 1 is provided with 6 fixed contacts 3 (a, b, c, d, e, f) spaced circumferentially; the tap changer has 5 positions; the moving contact 4 is in position 1 when it contacts ab, position 2 when it contacts bc, position 3 when it contacts cd, position 4 when it contacts de, and position 5 when it contacts ef.

[0027] In this embodiment, the gear shift disk 6 has five gear shift holes 601 spaced circumferentially (with corresponding gear shift markings next to each hole 601), and the operating handle 5 has a limiting pin 8 that cooperates with the gear shift holes 601. Thus, the operating handle 5 can be limited by the cooperation of the limiting pin 8 and the gear shift disk 6, preventing damage to the tap changer due to incomplete or excessive gear shifting. Furthermore, the gear shift disk 6 is fitted over the insulating base 1 and secured with a nut 9. This facilitates assembly and ensures a high degree of installation stability. Furthermore, the inner circumferential surface of the gear shift disk 6 has a positioning protrusion 61, and correspondingly, the outer circumferential surface of the insulating base 1 has a positioning groove 101. Therefore, when installing the gear shift disk 6, the positioning protrusion 61 is aligned with the positioning groove 101, allowing the gear shift disk 6 to fit over the insulating base 1, and then it is secured with the nut 9, making the operation very convenient.

[0028] The foregoing general description of the utility model and its specific embodiments should not be construed as limiting the technical solution of the utility model. Those skilled in the art, based on the disclosure of this application, can add, reduce, or combine the disclosed technical features in the foregoing general description and / or specific embodiments (including examples) without departing from the constituent elements of the utility model, to form other technical solutions within the protection scope of this application.

Claims

1. A disc tap changer for a single-phase pole-mounted transformer, comprising an insulating base (1) and a rotating shaft (2) disposed inside the insulating base (1); a set of fixed contacts (3) are provided circumferentially at intervals along the lower edge of the insulating base (1), and correspondingly, a moving contact (4) for use with the fixed contacts (3) is provided at the lower end of the rotating shaft (2); an operating handle (5) is provided at the top of the rotating shaft (2); and a position plate (6) is provided at the upper end of the insulating base (1); characterized in that: The lower edge of the insulating base (1) is provided with two mounting parts (7) for mounting the lead wires of the high and low voltage windings respectively; the mounting part (7) includes a mounting arm (71) fixed to the lower end of the insulating base (1) and a mounting plate (72) provided at the end of the mounting arm (71); the mounting plate (72) is provided with mounting holes (701).

2. The disc-type tap changer for a single-phase on- column transformer according to claim 1, characterized in that: On the mounting arm (71), inside the mounting plate (72), there is a partition (73).

3. The disc-type tap changer for a single-phase on- column transformer according to claim 2, characterized in that: The mounting arm (71) is Z-shaped, and the two sides of the mounting arm (71) are folded inward to form a reinforcing edge (74).

4. The disc-type tap changer for a single-phase on- column transformer according to claim 3, characterized in that: The two mounting arms (71) are at an angle of 120 to 150 degrees.

5. The disc type tap changer for a single-phase on- column transformer according to claim 2, characterized in that: The mounting plate (72) is L-shaped and includes two vertically distributed mounting parts, each of which has a mounting hole (701).

6. The disc-type tap changer for a single-phase on- column transformer according to claim 5, characterized in that: The mounting plate (72) has reinforcing ribs (75) on its concave surface.

7. A disc type tap changer for a single phase on- pole transformer according to claim 6, characterized in that: The mounting component (7) is integrally formed with the insulating base (1).

8. The disc type tap changer for a single-phase on- column transformer according to claim 1, characterized in that: The gear shift plate (6) is provided with a set of gear shift holes (601) spaced circumferentially, and the operating handle (5) is provided with a limiting pin (8) that works in conjunction with the gear shift holes (601).

9. A disc type tap changer for a single phase on- pole transformer according to claim 8, characterized in that: The gear shift plate (6) is sleeved on the outside of the insulating base (1) and locked in place by a nut (9).

10. A disc type tap changer for a single phase on- pole transformer as claimed in claim 9, characterized in that: The gear shift plate (6) has a positioning protrusion (61) on its inner circumferential surface, and correspondingly, the insulating seat (1) has a positioning groove (101) on its outer circumferential surface.

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