A type of transformer surge arrester

Abstract

This utility model provides a transformer-type surge arrester, relating to the field of surge arrester technology. It includes an arrester body, one end of which passes through a mounting housing and is fixedly connected to a cable head connection plate within the housing. An insulated wire passes through the mounting housing. The cable head connection plate is connected to one end of a grounding rod, and the other end of the grounding rod extends out of the mounting housing. A piercing clamp is also provided on the cable head connection plate. This utility model simplifies the installation process, eliminating the need to strip the insulation layer of the insulated wire; connection is achieved directly through the piercing clamp, reducing the steps of wire stripping and crimping in traditional wiring, thus lowering installation complexity. This utility model ensures connection reliability; tightening the piercing clamp guarantees both the mechanical connection's strength and good electrical contact, preventing operational failures due to poor contact and reducing potential failure points.

Description

Technical Field

[0001] This utility model mainly relates to the field of surge arrester technology, specifically to a variable-platform surge arrester. Background Technology

[0002] In power distribution systems, transformers serve as critical nodes for power distribution and conversion, and their operational safety directly impacts the stability of the entire power grid. With the rapid advancement of insulation improvements in distribution lines, pole-mounted transformer areas commonly face numerous problems: multiple points of failure in connection components such as switches, surge arresters, coupling clamps, and supports; poor insulation safety protection conditions; complex installation procedures; high maintenance difficulty and cost; and unfavorable conditions for live-line work. These issues not only affect the stable operation of the power distribution system but also hinder the improvement of power grid operation and maintenance efficiency.

[0003] Traditional transformer surge protection devices have several limitations in addressing the aforementioned issues: Early devices relied heavily on binding wires or ordinary clamps to secure the insulated conductors to the surge arrester. This not only resulted in poor compatibility with small conductors of 16 square millimeters and below, but also made them prone to loosening or damage due to uneven fixing force. Furthermore, they lacked an integrated structural design with the surge arrester. The conductor supports required additional post insulators, increasing the device's size and installation complexity. Additionally, the dispersed connections of multiple components resulted in insufficient mechanical strength, making them susceptible to displacement under conditions of strong winds and vibration, thus affecting protection stability.

[0004] Regarding the reliability of electrical connections, traditional wiring requires stripping the insulation layer of the insulated wires before connecting them to the surge arrester via crimp terminals. The wire stripping process can easily damage the conductor, and the crimping quality depends on manual operation. If the crimping is not secure, it can lead to increased contact resistance, causing localized overheating during operation and becoming a potential hazard. In addition, the exposed conductors after the insulation layer is removed are susceptible to corrosion from rainwater and dust, leading to the risk of leakage or short circuits, especially in humid and dusty environments where insulation safety is difficult to guarantee. Utility Model Content

[0005] 1. The technical problem to be solved by the utility model:

[0006] This utility model provides a variable-platform surge arrester to solve the technical problems existing in the background art.

[0007] 2. Technical Solution:

[0008] To achieve the above objectives, the technical solution provided by this utility model is as follows: a transformer-type surge arrester, comprising a surge arrester body, one end of which passes through the mounting housing and is fixedly connected to a cable head connection plate inside the mounting housing, an insulated conductor passing through the mounting housing, one end of the cable head connection plate being connected to a grounding rod, the other end of the grounding rod extending out of the mounting housing, and a piercing clamp provided on the cable head connection plate, the piercing end of the piercing clamp piercing the insulation layer of the insulated conductor along the radial direction of the insulated conductor, thereby making the piercing clamp in close contact with the conductor portion of the insulated conductor through the piercing action, realizing current transmission between the insulated conductor and the cable head connection plate.

[0009] Preferably, a grounding rod cover is fitted onto the outer side of the grounding rod. The grounding rod cover is semi-enclosed and is rotatably mounted on the grounding rod via a hinge.

[0010] Preferably, the end of the surge arrester body furthest from the mounting housing is connected to the disconnector.

[0011] Preferably, both ends of the cable head connecting plate are connected to the cable head connecting plate by a connecting bolt II, and the surge arrester body is connected to the cable head connecting plate by a plurality of connecting bolts I.

[0012] Preferably, the mounting housing is assembled from a front housing and a rear housing. Each of the front housing and the rear housing is provided with a connecting flap at one end near the surge arrester body. The connecting flaps are connected to each other by rivets, and an insulating sleeve is provided on the connecting flap.

[0013] Preferably, the mounting housing has an inlet / outlet hole at each of its left and right ends, through which the insulated wire passes. The mounting housing has a connecting groove at its upper end, through which the surge arrester body passes and enters the mounting housing. The mounting housing has a protective cover at its lower end, and the piercing clamp is located inside the protective cover.

[0014] Preferably, a positioning block is provided inside the front housing, and a positioning groove that cooperates with the positioning block is provided inside the rear housing.

[0015] Preferably, the piercing clamp is made of copper, and the piercing clamp includes a connecting cylinder with a clearance groove for the insulated wire to pass through. One end of the piercing clamp is connected to the cable head connecting plate by a connecting bolt, and the other end of the piercing clamp is threaded with an adjusting bolt. A piercing head is provided at the end of the adjusting bolt near the clearance groove.

[0016] 3. Beneficial effects:

[0017] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0018] This invention uses a piercing clamp to fix the insulated conductor, and combines this with the connection between the cable head connecting plate and the surge arrester body to form a stable mechanical structure, making the insulated conductor and the surge arrester body an integral unit. The piercing clamp pierces the insulation layer of the insulated conductor, achieving an electrical connection between the conductor and the clamp. The cable head connecting plate then connects the piercing clamp to the surge arrester body, forming an electrical path of "insulated conductor → piercing clamp → connecting plate → surge arrester body". When an overvoltage occurs in the system, this path can introduce the overvoltage into the zinc oxide resistor inside the surge arrester, using its nonlinear characteristics to limit the residual voltage (e.g., residual voltage of lightning impulse current ≤ 50kV), thus protecting the power distribution equipment.

[0019] This invention simplifies the installation process, eliminating the need to strip the insulation layer of the insulated wires and achieving connection directly through the piercing clamp. This reduces the steps of wire stripping and crimping in traditional wiring, lowering installation complexity. This invention ensures connection reliability; tightening the piercing clamp guarantees both a secure mechanical connection and good electrical contact, preventing operational malfunctions caused by poor contact and reducing potential failure points. This invention integrates the insulated wires, piercing clamps, and surge arrester body into a single unit via a cable head connecting plate, reducing the potential hazards of multiple connection points in traditional distributed structures, improving insulation safety protection, and ensuring safety. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the puncture clamp structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the connecting groove structure of this utility model;

[0024] Figure 5 This is a schematic diagram of the positioning groove structure of this utility model;

[0025] Figure 6 This is a schematic diagram of the separator structure of this utility model.

[0026] Figure label:

[0027] 1. Surge arrester body; 2. Mounting housing; 21. Front housing; 22. Rear housing; 23. Connecting plate; 24. Rivet; 25. Inlet / outlet hole; 26. Connecting groove; 27. Protective cover; 28. Positioning groove; 29. ​​Positioning block; 3. Insulated wire; 4. Grounding rod; 5. Grounding rod cover; 6. Disconnector; 7. Cable head connecting plate; 71. Connecting bolt one; 72. Connecting bolt two; 8. Piercing clamp; 81. Connecting cylinder; 82. Clearance groove; 83. Connecting bolt three; 84. Adjusting bolt; 85. Piercing head. Detailed Implementation

[0028] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element 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 of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] It should be noted that the structures not described in this utility model are the same as or can be implemented using existing technology, and will not be elaborated here, as they do not involve the design points and improvement directions of this utility model. Example

[0033] See attached document Figures 1-6 A type of surge arrester includes a surge arrester body 1. One end of the surge arrester body 1 passes through the mounting housing 2 and is fixedly connected to a cable head connection plate 7 inside the mounting housing 2. An insulated conductor 3 is installed through the mounting housing 2. One end of the cable head connection plate 7 is connected to a grounding rod 4. The other end of the grounding rod 4 extends out of the mounting housing 2. A piercing clamp 8 is also provided on the cable head connection plate 7. The piercing end of the piercing clamp 8 pierces the insulation layer of the insulated conductor 3 radially. Through the piercing action, the piercing clamp 8 makes close contact with the conductor part of the insulated conductor 3, realizing the current transmission between the insulated conductor 3 and the cable head connection plate 7.

[0034] A grounding rod cover 5 is installed on the outside of the grounding rod 4. The grounding rod cover 5 is semi-enclosed and is mounted on the grounding rod 4 by means of a hinge.

[0035] Both ends of the cable head connecting plate 7 are connected to the cable head connecting plate 7 by a connecting bolt 2 72, and the surge arrester body 1 is connected to the cable head connecting plate 7 by a number of connecting bolts 1 71.

[0036] The mounting housing 2 is composed of a front housing 21 and a rear housing 22. Both the front housing 21 and the rear housing 22 are provided with a connecting page 23 at one end near the arrester body 1. The connecting pages 23 are connected by rivets 24 and are provided with an insulating sleeve.

[0037] An inlet / outlet hole 25 is provided at each of the left and right ends of the mounting housing 2. The insulated wire 3 passes through the inlet / outlet hole 25 and passes through the mounting housing 2. A connecting groove 26 is provided at the upper end of the mounting housing 2. The surge arrester body 1 passes through the connecting groove 26 and enters the mounting housing 2. A protective cover 27 is provided at the lower end of the mounting housing 2. The piercing clamp 8 is located inside the protective cover 27.

[0038] A positioning block 29 is provided inside the front housing 21, and a positioning groove 28 that cooperates with the positioning block 29 is provided inside the rear housing 22.

[0039] The piercing clamp 8 is made of copper and includes a connecting cylinder 81. The connecting cylinder 81 has a clearance groove 82 for the insulated wire 3 to pass through. One end of the piercing clamp 8 is connected to the cable head connecting plate 7 by a connecting bolt 83. The other end of the piercing clamp 8 is threaded with an adjusting bolt 84. A piercing head 85 is provided at the end of the adjusting bolt 84 near the clearance groove 82.

[0040] Example 2 differs from Example 1 in that the end of the surge arrester body 1 furthest from the mounting housing 2 is connected to the disconnector 6.

[0041] Working principle:

[0042] This utility model is specifically designed for insulated conductors of 16 square millimeters and below, offering strong targeting and ensuring the stability and safety of small-diameter conductor connections. The insulated conductor 3 passes through the inlet / outlet hole 25 of the mounting housing 2 and is fixed by the piercing clamp 8—the clearance groove 82 of the piercing clamp 8 accommodates the insulated conductor 3. A torque wrench is used to tighten the adjusting bolt 84 to 10 N·m. After the adjusting bolt 84 is tightened, the piercing head 85 pierces the insulation layer of the insulated conductor 3 radially, making close contact with the conductor. Since the connecting cylinder 81 is connected to the cable head connecting plate 7 via connecting bolt 83, a stable mechanical and electrical connection is formed. At this time, the surge arrester body 1 is fixed to the cable head connecting plate 7 via connecting bolt 71, and is in a high-resistance state, allowing only microampere-level leakage current to pass through, acting as an insulator and not affecting the normal power supply of the line. The front housing 21 and rear housing 22 of the housing 2 are spliced ​​together by the positioning block 29 and the positioning groove 28. The connecting page 23 is fixed by the rivet 24, which encloses and protects the internal components such as the cable head connecting plate 7 and the piercing clamp 8. The insulating sheath and protective cover 27 further enhance the insulation and protection. The semi-enclosed grounding rod cover 5 on the outside of the grounding rod 4 is in a closed state, protecting the grounding rod 4 from the influence of the external environment.

[0043] When the system encounters an overvoltage (lightning impulse or switching overvoltage), the protection mechanism is immediately activated. If the overvoltage value exceeds the starting voltage of the surge arrester body 1, the zinc oxide resistor inside it rapidly changes to a low-resistance state due to its nonlinear characteristics. The large current generated by the overvoltage flows through the surge arrester body 1 into the cable head connection plate 7. The current then splits into two paths: one path flows back in reverse along the path "insulated wire 3 → piercing clamp 8 → cable head connection plate 7 → surge arrester body 1" through the conductor contact point between the piercing clamp 8 and the insulated wire 3, balancing the line voltage; the other path flows through the grounding rod 4 connected to the cable head connection plate 7, introducing the large current to the ground and quickly releasing the overvoltage energy. During this process, the high-strength core and composite jacket (bending strength ≥1kN) of the surge arrester body 1 continuously support the insulated wire 3, ensuring the stability of the mechanical structure, while the enclosed structure and insulating components of the mounting housing 2 prevent current leakage or short-circuit risks.

[0044] If the surge arrester body 1 malfunctions due to long-term operation (such as aging or breakdown), the disconnector 6 will play a crucial role. When the surge arrester body 1 cannot return to a high-resistance state and a continuous power frequency follow current occurs, the disconnector 6 will activate upon sensing an abnormal current or temperature change, disconnecting from the surge arrester body 1, cutting off the connection between the faulty surge arrester and the line, and preventing the fault from escalating and affecting the entire power distribution system. Simultaneously, the grounding rod cover 5 can be opened via a hinge, facilitating maintenance personnel to inspect the condition of the grounding rod 4. The detachable structure of the front housing 21 and the rear housing 22 also provides convenience for the maintenance of internal components.

[0045] In addition, for insulated wires 3 with an outer diameter of 16 square millimeters or more, it is only necessary to remove the piercing clamp 8 on the cable head connection plate 7 and use the terminal block to fix the insulated wire 3 to the cable head connection plate 7.

[0046] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A variable-type surge arrester, comprising an arrester body (1), characterized in that: One end of the surge arrester body (1) passes through the mounting housing (2) and is fixedly connected to the cable head connection plate (7) inside the mounting housing (2). The insulated wire (3) passes through the mounting housing (2). The cable head connection plate (7) is connected to one end of the grounding rod (4). The other end of the grounding rod (4) extends out of the mounting housing (2). The cable head connection plate (7) is also provided with a piercing clamp (8). The piercing end of the piercing clamp (8) pierces the insulation layer of the insulated wire (3) along the radial direction. Through the piercing action, the piercing clamp (8) makes close contact with the conductor part of the insulated wire (3) to realize the current transmission between the insulated wire (3) and the cable head connection plate (7).

2. A transformer-type surge arrester according to claim 1, characterized in that: A grounding rod cover (5) is fitted on the outside of the grounding rod (4). The grounding rod cover (5) is semi-enclosed and is mounted on the grounding rod (4) by means of a hinge.

3. A transformer-type surge arrester according to claim 1, characterized in that: The end of the surge arrester body (1) away from the mounting housing (2) is connected to the disconnector (6).

4. A transformer-type surge arrester according to claim 1, characterized in that: The two ends of the cable head connecting plate (7) are respectively connected to the cable head connecting plate (7) by a connecting bolt two (72), and the surge arrester body (1) is connected to the cable head connecting plate (7) by several connecting bolt one (71).

5. A transformer-type surge arrester according to claim 1, characterized in that: The mounting housing (2) is assembled from a front housing (21) and a rear housing (22). Both the front housing (21) and the rear housing (22) are provided with a connecting page (23) at one end near the arrester body (1). The connecting pages (23) are connected to each other by rivets (24). An insulating sleeve is provided on the connecting page (23).

6. A transformer-type surge arrester according to claim 5, characterized in that: The mounting housing (2) has an inlet / outlet hole (25) at each of its left and right ends. The insulated wire (3) passes through the inlet / outlet hole (25) through the mounting housing (2). The upper end of the mounting housing (2) has a connecting groove (26). The surge arrester body (1) passes through the connecting groove (26) and enters the mounting housing (2). The lower end of the mounting housing (2) has a protective cover (27). The piercing clamp (8) is located inside the protective cover (27).

7. A transformer-type surge arrester according to claim 6, characterized in that: The front housing (21) is provided with a positioning block (29), and the rear housing (22) is provided with a positioning groove (28) that cooperates with the positioning block (29).

8. A transformer-type surge arrester according to claim 1, characterized in that: The piercing clamp (8) is made of copper. The piercing clamp (8) includes a connecting cylinder (81). The connecting cylinder (81) has a clearance groove (82) for the insulated wire (3) to pass through. One end of the piercing clamp (8) is connected to the cable head connecting plate (7) by a connecting bolt (83). The other end of the piercing clamp (8) is threaded with an adjusting bolt (84). The adjusting bolt (84) has a piercing head (85) at one end near the clearance groove (82).

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