On-load tap changer for energy-saving protection of power distribution system

Abstract

The utility model discloses a kind of on-load tap changer for energy-saving protection of distribution system, including the main body of on-load tap changer, main body has insulating cylinder and movable contact, fixed contact is provided on insulating cylinder, fixed contact is provided with the binding post for connecting transformer cable, elastic cylindrical protective cover is sleeved on binding post, the both ends of protective cover are respectively sealed with binding post and transformer cable Connection, so that the connection part of protective cover sealingly wraps transformer cable and binding post.The utility model is sealedly wrapped in its inside by protective cover, the connection part of binding post and transformer cable, can effectively resist the influence caused by oxidation corrosion, damp pollution and dust accumulation, greatly improve the conduction reliability and insulation safety between transformer and on-load tap changer connection, reduce the probability of equipment failure.

Description

Technical Field

[0001] This utility model belongs to the field of on-load tap changer technology, and particularly relates to an on-load tap changer for energy-saving protection of power distribution systems. Background Technology

[0002] In power distribution systems, on-load tap changers automatically adjust the tap positions of dry-type transformers under load to ensure that the transformer's output voltage remains stable near the load's rated voltage, achieving energy savings and protecting electrical equipment. On-load tap changers can switch transformer taps under load when the grid voltage fluctuates, ensuring that user electrical equipment operates at its set rated voltage, thus providing benefits such as energy saving, safety, economy, increased production, and significantly extended equipment lifespan.

[0003] The patent with publication number CN221352594U discloses an on-load tap changer whose fixed contact wiring part is exposed to the air for a long time, which will cause oxidation corrosion, moisture pollution and dust accumulation, damaging the conductivity reliability and insulation safety of the connection between the wiring part and the transformer, and may cause poor contact, insulation failure or even short circuit faults, affecting the normal operation of the equipment.

[0004] Therefore, it is necessary to improve the on-load tap changers in the existing technology. Utility Model Content

[0005] The purpose of this utility model is to overcome the defects in the existing technology and provide an on-load tap changer for energy-saving protection of power distribution systems, which improves the connection stability between the on-load tap changer and the transformer.

[0006] To achieve the above objectives, the specific technical solution of the on-load tap changer for energy-saving protection of power distribution systems of this utility model is as follows: An on-load tap changer for energy-saving protection in a power distribution system includes a main body of the on-load tap changer. The main body has an insulating cylinder and a moving contact. A fixed contact is provided on the insulating cylinder. A stud for connecting a transformer cable is provided on the fixed contact. An elastic cylindrical protective cover is fitted on the stud. The two ends of the protective cover are respectively sealed to the stud and the transformer cable, so that the protective cover seals and covers the connection part between the transformer cable and the stud.

[0007] Preferably, a contact seat is fixedly connected to the insulating cylinder, and the contact seat has a mounting hole extending radially along the insulating cylinder, and the wiring stud is coaxially disposed through the mounting hole.

[0008] Preferably, the fixed contact has a flat structure, the moving contact has a contact groove that matches the fixed contact, and the contact seat has a positioning groove on one end face inside the insulating cylinder, the positioning groove being inserted into the fixed contact.

[0009] Preferably, the end of the transformer cable is provided with a cold-pressed terminal, and a nut is threaded onto the terminal block to fix the cold-pressed terminal and the terminal block.

[0010] Preferably, an elastic washer and two nuts are sequentially arranged on the wiring stud in the axial direction away from the contact seat, the cold-pressed terminal is disposed between the two nuts, and the end of the protective cover is detachably connected to the elastic washer.

[0011] Preferably, the elastic pad includes two disc springs circumferentially fixedly connected to its four edges, the two disc springs being spaced apart along the axial direction of the elastic pad, and an annular clamping portion being provided at the end opening of the protective cover, the clamping portion being disposed between the two disc springs.

[0012] Preferably, a plurality of rigid heat-conducting elements are embedded inside the clamping part, and the heat-conducting elements extend radially to the outside of the clamping part.

[0013] Preferably, the clamping part is circumferentially fixedly connected to an annular sealing part, and the sealing part is in sealing contact with the outer wall of the insulating cylinder.

[0014] Preferably, the front end of the protective cover is provided with a thickened narrow opening, the inner diameter of which is smaller than the outer diameter of the transformer cable.

[0015] The on-load tap changer for energy-saving protection of power distribution systems of this utility model has the following advantages: the connection between the wiring stud and the transformer cable is sealed and wrapped inside the protective cover, which can effectively resist the effects of oxidation corrosion, moisture pollution and dust accumulation, greatly improve the conductivity reliability and insulation safety of the connection between the transformer and the on-load tap changer, and reduce the probability of equipment failure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the on-load tap changer of this utility model; Figure 2 This is a schematic diagram of the internal structure of the on-load tap changer of this utility model; Figure 3 This is a schematic diagram of the structure of the insulating cylinder of this utility model; Figure 4 This is a schematic diagram of the connection structure between the wiring stud and the transformer cable of this utility model; Figure 5This is a schematic diagram of the structure of the elastic gasket of this utility model; Figure 6 This is a schematic diagram of the structure of the fixed contact of this utility model; Figure 7 This is a schematic diagram of the structure of the protective cover of this utility model; The markings in the diagram are as follows: 1. Main body; 2. Elastic gasket; 3. Insulating cylinder; 5. Protective cover; 6. Transformer cable; 7. Nut; 8. Moving contact; 201. Disc spring; 301. Contact seat; 302. Mounting hole; 303. Positioning groove; 401. Fixed contact; 402. Wiring stud; 501. Narrowing opening; 502. Clamping part; 503. Sealing part; 504. Heat-conducting component; 601. Cold-pressed terminal. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0018] The terms "top surface," "bottom surface," and "full surface" refer to the normal operating state of the on-load tap changer and are used only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model.

[0019] like Figure 1-4 As shown, an on-load tap changer for energy-saving protection of a power distribution system includes a main body 1 of the on-load tap changer. The main body 1 has an insulating cylinder 3 and a moving contact 8. A fixed contact 401 is provided on the insulating cylinder 3. A stud 402 for connecting a transformer cable 6 is provided on the fixed contact 401. An elastic cylindrical protective cover 5 is sleeved on the stud 402. The two ends of the protective cover 5 are respectively sealed to the stud 402 and the transformer cable 6, so that the protective cover 5 seals and wraps the connection part between the transformer cable 6 and the stud 402.

[0020] The aforementioned on-load tap changer can connect to a transformer in a power distribution system. By automatically adjusting the different tap positions of the dry-type transformer under load, it ensures that the transformer's output voltage remains stable near the load's rated voltage. This achieves on-load voltage regulation, harmonic mitigation, three-phase balance, and intelligent optimization, protecting production equipment within the power grid system, extending equipment life, reducing failure rates, and simultaneously reducing line losses, energy conservation, and carbon reduction. The transformer cable 6 extends from the tap positions of the transformer at different tap positions and connects to the corresponding studs 402 of the fixed contacts 401. Adjusting the transformer tap position is achieved by rotating the moving contact 8 to connect with different fixed contacts 401. The protective cover 5 is made of rubber, providing good elasticity and a good seal when connected to the studs 402 and transformer cable 6. The protective cover 5 seals the connection between the transformer cable 6 and the studs 402, preventing corrosion from moisture, dust, and other debris. This ensures the cleanliness of the connection when used outdoors, maintains the stability of the electrical connection between the on-load tap changer and the transformer, and reduces equipment failure rates.

[0021] Further improvements include, for example Figure 2 , 3 As shown in Figure 6, a contact seat 301 is fixedly connected to the insulating cylinder 3. The contact seat 301 has a mounting hole 302 extending radially along the insulating cylinder 3. The wiring stud 402 is coaxially inserted through the mounting hole 302. The fixed contact 401 has a flat structure. The moving contact 8 has a contact groove that matches the fixed contact 401. A positioning groove 303 is provided on one end face of the contact seat 301 inside the insulating cylinder 3. The positioning groove 303 is inserted into the fixed contact 401.

[0022] In the above-mentioned on-load tap changer, the fixed contact 401 and the terminal stud 402 are integrally formed. When installing the fixed contact 401, firstly, the terminal stud 402 is passed from the inside of the insulating cylinder 3 to the outside through the mounting hole 302. Then, one end of the fixed contact 401 is inserted into the positioning groove 303. The positioning groove 303 restricts the rotation of the fixed contact 401 around the axis of the terminal stud 402, thereby improving the stability of the fixed contact 401 installation. Then, the nut 7 is screwed onto the terminal stud 402 from the outside of the insulating cylinder 3 to complete the installation and fixation of the fixed contact 401. At the same time, the fixed contact 401 can be easily disassembled and assembled by removing and installing the nut 7, thereby improving the convenience of equipment maintenance. When the moving contact 8 rotates, the fixed contact 401 can enter the contact groove from both sides. The contact groove can guide and limit the fixed contact 401 to improve the stability of the connection between the fixed contact 401 and the moving contact 8.

[0023] Further improvements include, for example Figure 4As shown, a cold-pressed terminal 601 is provided at the end of the transformer cable 6, and a nut 7 is threaded onto the stud 402. The cold-pressed terminal 601 and the stud 402 are fixed by the nut 7. An elastic washer 2 and two nuts 7 are arranged sequentially on the stud 402 in the axial direction away from the contact seat 301. The cold-pressed terminal 601 is located between the two nuts 7. The end of the protective cover 5 is detachably connected to the elastic washer 2.

[0024] In the above-mentioned on-load tap changer, a nut 7 near the insulating cylinder 3 is used to fix the wiring stud 402 and the fixed contact 401 to the contact seat 301. The cold-pressed terminal 601 has an opening through which the wiring stud 402 can pass. By clamping the cold-pressed terminal 601 from both sides with two nuts 7 respectively, the fixed connection between the cold-pressed terminal 601 and the wiring stud 402 can be realized, improving the firmness of the cold-pressed terminal 601 installation and the convenience of disassembly and assembly. At the same time, the elastic washer 2 generates a spring force on the nut 7 along the axial direction of the wiring stud 402, which can make the thread engagement between the nut 7 and the wiring stud 402 more firm, thereby improving the firmness of the nut 7 in fixing the fixed contact 401 and the cold-pressed terminal 601.

[0025] Further improvements include, for example Figure 5 As shown, the elastic gasket 2 includes two disc springs 201 circumferentially fixedly connected to its four edges. The two disc springs 201 are spaced apart along the axial direction of the elastic gasket 2. An annular clamping part 502 is provided at the end opening of the protective cover 5, and the clamping part 502 is disposed between the two disc springs 201. The disc springs 201 deform under the compression of the nut 7 and the contact seat 301, thereby generating elastic force. After the two disc springs 201 deform, they can clamp and fix the clamping part 502, thereby achieving clamping and fixing of the protective cover 5 and improving the convenience of disassembling and assembling the protective cover 5.

[0026] Further improvements include, for example Figure 7As shown, multiple rigid heat-conducting elements 504 are embedded inside the clamping part 502, and the heat-conducting elements 504 extend radially to the outside of the clamping part 502; an annular sealing part 503 is fixedly connected to the outer periphery of the clamping part 502, and the sealing part 503 seals against the outer wall of the insulating cylinder 3; the front end of the protective cover 5 is provided with a thickened narrow opening 501, and the inner diameter of the narrow opening 501 is smaller than the outer diameter of the transformer cable 6. The protective cover 5, the narrowing opening 501, the clamping part 502, and the sealing part 503 are integrated into one structure. The clamping part 502, held from both sides by two disc springs 201, can securely install the protective cover 5. The clamping part 502 is made of rubber; its elasticity, combined with the disc springs 201, enhances the support for the nut 7, improving the stability of the nut 7 installation. The heat-conducting component 504 is a flat, strip-shaped structure. Placed inside the clamping part 502, it first provides support for the clamping part 502, ensuring good support. This support allows the sealing part 503 to fit tightly against the protective cover 5, thereby ensuring proper sealing. 03 The portion of the contact seat 301 located outside the insulating cylinder 3 and the terminal stud 402 are enclosed inside it. Through the sealing connection between the sealing part 503 and the insulating cylinder 3, the gap between the terminal stud 402 and the mounting hole 302 can be sealed, improving the sealing performance of the insulating cylinder 3 and preventing external moisture and dust from entering the interior of the insulating cylinder 3. The narrow opening 501, under its own elasticity, can tightly wrap the transformer cable 6 from all sides, thereby achieving a sealed connection between the protective cover 5 and the transformer cable 6. Thus, the protective cover 5 can seal the entire terminal stud 402, cold-pressed terminal 601 and contact seat 301 inside it, so as to achieve a good protective effect.

[0027] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. An on-load tap changer for energy-saving protection of a power distribution system, comprising a main body (1) of the on-load tap changer, wherein the main body (1) has an insulating cylinder (3) and a moving contact (8), characterized in that: The insulating cylinder (3) is provided with a fixed contact (401), and the fixed contact (401) is provided with a stud (402) for connecting the transformer cable (6). The stud (402) is fitted with an elastic cylindrical protective cover (5). The two ends of the protective cover (5) are respectively sealed to the stud (402) and the transformer cable (6), so that the protective cover (5) seals and wraps the connection part between the transformer cable (6) and the stud (402).

2. The on-load tap changer for energy-saving protection of power distribution systems according to claim 1, characterized in that, A contact seat (301) is fixedly connected to the insulating cylinder (3). The contact seat (301) has a mounting hole (302) extending radially along the insulating cylinder (3). The wiring stud (402) is coaxially connected through the mounting hole (302).

3. The on-load tap changer for energy-saving protection of power distribution systems according to claim 2, characterized in that, The fixed contact (401) has a flat structure, and the moving contact (8) has a contact groove that matches the fixed contact (401). The contact seat (301) has a positioning groove (303) on one end face inside the insulating cylinder (3). The positioning groove (303) is inserted into the fixed contact (401).

4. The on-load tap changer for energy-saving protection of power distribution systems according to claim 2, characterized in that, The transformer cable (6) is provided with a cold-pressed terminal (601) at its end, and a nut (7) is threaded onto the stud (402) to fix the cold-pressed terminal (601) and the stud (402).

5. The on-load tap changer for energy-saving protection of power distribution systems according to claim 4, characterized in that, An elastic washer (2) and two nuts (7) are sequentially arranged on the wiring stud (402) in the axial direction away from the contact seat (301). The cold-pressed terminal (601) is arranged between the two nuts (7). The end of the protective cover (5) is detachably connected to the elastic washer (2).

6. The on-load tap changer for energy-saving protection of power distribution systems according to claim 5, characterized in that, The elastic pad (2) includes two disc springs (201) circumferentially fixedly connected to its four edges. The two disc springs (201) are distributed at intervals along the axial direction of the elastic pad (2). The end opening of the protective cover (5) is provided with an annular clamping part (502), which is disposed between the two disc springs (201).

7. The on-load tap changer for energy-saving protection of power distribution systems according to claim 6, characterized in that, The clamping part (502) is internally embedded with a plurality of rigid heat-conducting elements (504), which extend radially from the clamping part (502) to the outside of the clamping part (502).

8. The on-load tap changer for energy-saving protection of power distribution systems according to claim 7, characterized in that, The clamping part (502) is circumferentially fixedly connected to an annular sealing part (503), and the sealing part (503) is in sealing contact with the outer wall of the insulating cylinder (3).

9. The on-load tap changer for energy-saving protection of power distribution systems according to claim 7, characterized in that, The front end of the protective cover (5) is provided with a thickened narrow opening (501), the inner diameter of which is smaller than the outer diameter of the transformer cable (6).

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