10kv~20kv distribution line with lightning arrester intelligent insulator

Abstract

The application relates to the technical field of power equipment, and discloses a 10kV-20kV power distribution line intelligent insulator with a lightning arrester, which comprises an insulator, an upper metal head arranged at the upper end of the insulator, a lower metal head arranged at the lower end of the insulator, and a lightning arrester body arranged in the hollow interior of the insulator and penetrating through the insulator; one end of the lightning arrester body is connected in conduction with the upper metal head, the other end of the lightning arrester body is connected in conduction with the lower metal head, and a lightning stroke counter, a failure alarm and a signal transmitter are arranged on the lower metal head. The lightning arrester and the insulator are combined into one in the application, the line structure is simplified, the installation and use are facilitated, the lightning stroke counter, the failure alarm and the signal transmitter are integrated, lightning stroke information, insulator damage conditions and real-time load data on each phase conductor can be sent to a control center in time, intelligent power distribution network construction is realized, and subsequent operation and maintenance are facilitated.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to a smart insulator with surge arrester for 10kV to 20kV distribution lines. Background Technology

[0002] Lightning strikes are among the most severe natural disasters. They have numerous and serious impacts on power distribution lines. 10kV to 20kV distribution lines directly serve users; when struck by lightning, the powerful surge can cause overvoltage, leading to short circuits, tripping protection circuit breakers, and frequent power outages. This reduces user satisfaction and affects power quality. More seriously, if the lightning surge waves generated after a lightning strike travel along transmission and distribution lines into substations, they pose a significant threat to substation equipment, potentially causing widespread power outages and severely impacting social production and residents' lives. Furthermore, lightning strikes can create lightning voltage within substations, potentially causing transformer insulation breakdown due to high-voltage lines. Therefore, the impact of lightning strikes on power distribution lines is substantial and cannot be ignored; effective lightning protection measures are necessary to ensure the safe, reliable, and stable operation of the power system.

[0003] Surge arresters are commonly used protective devices to protect electrical equipment on power distribution lines from high transient overvoltages caused by lightning strikes. Typically, surge arresters are installed on the crossarm of a tower, located on one side of an insulator. The insulator supports the overhead power line conductors, and the arrester's leads connect to the conductors on the insulator. This structure has several drawbacks. First, the surge arrester and insulator occupy excessive space on the crossarm, and their complex structure makes installation and maintenance inconvenient. Second, if the insulator is damaged by a breakdown, or if the arrester's leads become loose or detached, the insulator and arrester will fail, and this failure is difficult to detect, leaving the power distribution line without reliable lightning protection. Summary of the Invention

[0004] Based on the above, the purpose of this invention is to provide a smart insulator with surge arrester for 10kV to 20kV distribution lines, optimize the structure of existing insulators and surge arresters, and solve the problems existing in the existing structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A smart insulator with surge arrester for 10kV to 20kV distribution lines includes an insulator body, an upper metal head for fixing the distribution line conductors at the upper end of the insulator body, a lower metal head for fixing and conducting with a crossarm at the lower end of the insulator body, a hollow interior of the insulator body through which a surge arrester body is inserted, one end of the surge arrester body being connected to the upper metal head and conducting, and the other end of the surge arrester body being connected to the lower metal head and conducting.

[0007] The lower metal head is equipped with a lightning strike counter, a failure alarm, and a signal transmitter. The lightning strike counter is used to monitor and record the number of discharge actions and lightning strike parameters of the surge arrester body. The failure alarm is used to sound an alarm when the insulator loses its insulation function or the surge arrester body fails and short-circuits. The signal transmitter is used to transmit the collected information from the lightning strike counter, the alarm signal from the failure alarm, and the real-time load data on each phase conductor of the power distribution line to the control center.

[0008] As an optional solution, a current transformer is installed in the lower metal head. The induction coil of the current transformer generates induced voltage and induced current through electromagnetic coupling with the power distribution line conductor, thereby powering the lightning strike counter, failure alarm and signal transmitter.

[0009] As an optional solution, the signal transmitter has a built-in lithium battery, which powers the signal transmitter when the current transformer does not generate induced voltage or induced current.

[0010] As an optional solution, a thermistor connected to the fault alarm signal is installed at the bottom of the inner wall of the insulator. The thermistor is used to collect the heat generated when the lightning current passes through the surge arrester body, and to collect the abnormal heat generated by the power frequency follow current when the insulator loses its insulation function or the surge arrester body fails and short-circuits, and to issue an action command. The action command is used to trigger the fault alarm.

[0011] As an optional solution, the upper metal head includes an upper pressure plate and a lower pressure plate. The lower pressure plate is fixedly connected to the insulator. The lower pressure plate and the upper pressure plate are respectively provided with a cavity. The lower pressure plate is provided with a first fixing bolt on both sides of the cavity. The first fixing bolt passes through the upper pressure plate. The first fixing bolt is provided with a first fixing nut for locking the upper pressure plate and the lower pressure plate. When the upper pressure plate and the lower pressure plate are locked, the two cavities cooperate to clamp the power distribution line conductor.

[0012] As an alternative, a spring pressure plate is provided between the cavity and the power distribution line conductor. The spring pressure plate is corrugated and arranged along the inner wall of the cavity. A second fixing bolt is inserted through the spring pressure plate and fixed to the cavity. The spring pressure plate is used to eliminate the vibration of the power distribution line conductor under wind force and to avoid the occurrence of longitudinal tension imbalance caused by thermal expansion and contraction.

[0013] As an alternative, a third fixing bolt is provided on the lower metal head, which passes through the crossarm, and a second fixing nut is provided on the third fixing bolt for locking the lower metal head to the crossarm.

[0014] The beneficial effects of this invention are:

[0015] The 10kV to 20kV distribution line uses a smart insulator with surge arrester, which combines the surge arrester and the insulator into one, simplifying the line structure and facilitating installation and use. It also integrates a lightning strike counter, a failure alarm, and a signal transmitter, which can promptly send lightning strike information, damage status of the smart insulator with surge arrester, and real-time load data on each phase conductor to the control center, realizing the construction of an intelligent distribution network and facilitating subsequent operation and maintenance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a smart insulator with surge arrester for 10kV to 20kV power distribution lines provided in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the upper metal head fixing the power distribution line conductor in a smart insulator with surge arrester for 10kV to 20kV power distribution lines provided in an embodiment of the present invention.

[0018] In the attached image:

[0019] 1. Insulator; 2. Upper metal head; 21. Upper pressure plate; 22. Lower pressure plate; 23. Cavity; 24. First fixing bolt; 25. First fixing nut; 26. Spring pressure plate; 27. Second fixing bolt; 3. Lower metal head; 31. Third fixing bolt; 32. Second fixing nut; 4. Surge arrester body; 5. Lightning strike counter; 6. Failure alarm; 7. Signal transmitter; 8. Power distribution line conductor; 9. Crossarm; 10. Current transformer. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, 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. Therefore, they should not be construed as limitations on the present invention.

[0024] Furthermore, the terms "first" and "second" are merely used to distinguish between different terms in description and do not have any special meaning.

[0025] Please see Figure 1 and Figure 2 As shown, this embodiment provides a smart insulator with surge arrester for 10kV to 20kV distribution lines, including an insulator 1. The upper end of the insulator 1 is provided with an upper metal head 2 for fixing the distribution line conductor 8, and the lower end of the insulator 1 is provided with a lower metal head 3 for fixing and conducting with a crossarm 9. The interior of the insulator 1 is hollow and a surge arrester body 4 is inserted through it. One end of the surge arrester body 4 is connected to the upper metal head 2 and conducting, and the other end of the surge arrester body 4 is connected to the lower metal head 3 and conducting.

[0026] Specifically, the lower metal head 3 is equipped with a lightning strike counter 5, a failure alarm 6, and a signal transmitter 7. The lightning strike counter 5 is used to monitor and record the number of discharge actions and lightning strike parameters of the surge arrester body 4. The failure alarm 6 is used to sound an alarm when the insulator 1 loses its insulation function or the surge arrester body 4 fails and short-circuits. The signal transmitter 7 is used to transmit the collected information from the lightning strike counter 5, the alarm signal from the failure alarm 6, and the real-time load data on each phase conductor of the power distribution line conductor 8 to the control center.

[0027] This changes the traditional structure of surge arresters and insulators, combining them into one unit, simplifying the line structure, facilitating installation and use, and integrating a lightning strike counter 5, a failure alarm 6, and a signal transmitter 7. This allows for timely transmission of lightning strike information, insulator damage status, and real-time load data on each phase conductor to the control center, enabling the construction of an intelligent distribution network and facilitating subsequent operation and maintenance.

[0028] Among them, the lightning strike counter 5, the failure alarm 6, and the signal transmitter 7 are all existing functional devices, and their specific structures and principles will not be described in detail.

[0029] In order to provide power to the lightning strike counter 5, the failure alarm 6 and the signal transmitter 7 so as to provide timely feedback on the fault situation, in some embodiments, a current transformer 10 is provided in the lower metal head 3. The induction coil of the current transformer 10 generates induced voltage and induced current through electromagnetic coupling with the power distribution line conductor 8, thereby supplying power to the lightning strike counter 5, the failure alarm 6 and the signal transmitter 7.

[0030] Since power distribution lines carry voltages of 10kV to 20kV, electricity can be easily extracted using the principle of electromagnetic coupling, eliminating the need for additional power supplies. Electromagnetic coupling technology is an existing technology and will not be discussed in detail here; however, induction power generation is feasible.

[0031] Furthermore, considering the possibility of power line breakage or current transformer 10 failure, taking signal transmitter 7 as an example, signal transmitter 7 is equipped with a built-in lithium battery. The lithium battery serves as a backup power source and can supply power to signal transmitter 7 when current transformer 10 does not generate induced voltage or induced current. Similarly, backup batteries can be equipped on lightning strike counter 5 and failure alarm 6.

[0032] To enable sensitive triggering of the failure alarm 6, in some embodiments, a thermistor connected to the signal of the failure alarm 6 is provided at the bottom of the inner wall of the insulator 1. The thermistor is used to collect the heat generated when the lightning current passes through the surge arrester body 4, and to issue an action command when abnormal heat generated by the power frequency follow current is collected when the insulator 1 loses its insulation function or the surge arrester body 4 fails and short-circuits. The action command is used to trigger the failure alarm 6 to alarm.

[0033] The abnormal heat is caused by the power frequency follow current generated on the power distribution line conductor 8 under the normal operating voltage when the insulator 1 loses its insulation function or the surge arrester body 4 fails and short-circuits.

[0034] In addition, the failure alarm 6 can send alarm information to the control center remotely, and can also eject warning flags on site to help on-site patrol personnel quickly locate the fault point for repair, greatly shortening the fault repair time and improving maintenance efficiency.

[0035] Therefore, by transmitting information between the lightning strike counter 5 and the failure alarm 6 and the control center via the signal transmitter 7, the following advantages are achieved: First, information such as the location of the lightning strike, the number of lightning strikes, and the peak value of the lightning current can be fed back. Second, the failure status of the insulators can be promptly reported to the control center to identify the fault point and improve the efficiency of power distribution line repair. Third, by using electromagnetic coupling to obtain power, the load data of the power distribution line can be directly fed back. Taking a three-phase power distribution line as an example, if one phase of the line is overloaded, the induced voltage measured by the current transformer 10 will be abnormally high. Based on this, the load on the overloaded line can be manually transferred to the underloaded line, thereby improving the transmission efficiency and stability of the entire power distribution line.

[0036] In some embodiments, the upper metal head 2 includes an upper pressure plate 21 and a lower pressure plate 22. The lower pressure plate 22 is fixedly connected to the insulator 1. The lower pressure plate 22 and the upper pressure plate 21 are respectively provided with a cavity 23. A first fixing bolt 24 is provided on the lower pressure plate 22 and on both sides of the cavity 23. The first fixing bolt 24 passes through the upper pressure plate 21. A first fixing nut 25 is provided on the first fixing bolt 24 for locking the upper pressure plate 21 and the lower pressure plate 22. When the upper pressure plate 21 and the lower pressure plate 22 are locked, the two cavities 23 cooperate to clamp the power distribution line conductor 8.

[0037] Furthermore, a spring pressure plate 26 is provided between the cavity 23 and the power distribution line conductor 8. The spring pressure plate 26 is corrugated and arranged along the inner wall of the cavity 23. A second fixing bolt 27 is provided on the spring pressure plate 26 and fixedly connected to the cavity 23. The spring pressure plate 26 is used to eliminate the vibration of the power distribution line conductor 8 under wind force and to avoid the occurrence of longitudinal tension imbalance caused by thermal expansion and contraction.

[0038] The spring pressure plate 26 here is formed by pressing stainless steel sheet in one piece. The thickness of the spring pressure plate 26 is 0.2mm to 0.3mm. The end face is wavy. The bending radius is selected according to the size of the power distribution line conductor 8. It is also necessary to consider the case where the power distribution line conductor 8 is covered with 1mm thick aluminum tape, and leave an appropriate margin.

[0039] In some embodiments, a third fixing bolt 31 is provided on the lower metal head 3, the third fixing bolt 31 passes through the crossbeam 9, and a second fixing nut 32 is provided on the third fixing bolt 31 for locking the lower metal head 3 to the crossbeam 9.

[0040] Thus, the third fixing bolt 31 and the second fixing nut 32 mechanically fix the intelligent insulator with surge arrester to the crossarm 9, and electrically divert the lightning current on the surge arrester body 4 to the crossarm 9.

[0041] With the deployment of intelligent insulators with surge arresters on 10kV to 20kV distribution lines, the signal transmitter 7 on each insulator can monitor and collect information such as load and lightning strike conditions on each distribution line in real time, and transmit it to the control center wirelessly. The control center can then promptly grasp the on-site operation status of each distribution line and each insulator location, understand its relevant health status, load status, and working status, so as to carry out operation scheduling, thereby providing key data support and decision-making basis for the construction of a smart grid.

[0042] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A smart insulator with surge arrester for 10kV~20kV power distribution lines, characterized in that, The insulator (1) is provided with an upper metal head (2) for fixing the power distribution line conductor (8) at its upper end and a lower metal head (3) for fixing and conducting with the crossarm (9) at its lower end. The insulator (1) is hollow inside and has a surge arrester body (4) inserted through it. One end of the surge arrester body (4) is connected to the upper metal head (2) and the other end of the surge arrester body (4) is connected to the lower metal head (3). The lower metal head (3) is equipped with a lightning strike counter (5), a failure alarm (6), and a signal transmitter (7). The lightning strike counter (5) is used to monitor and record the number of discharge actions and lightning strike parameters of the surge arrester body (4). The failure alarm (6) is used to sound an alarm when the insulator (1) loses its insulation function or the surge arrester body (4) fails and short-circuits. The signal transmitter (7) is used to transmit the collected information of the lightning strike counter (5), the alarm signal of the failure alarm (6), and the real-time load data on each phase conductor of the power distribution line conductor (8) to the control center.

2. The intelligent insulator with surge arrester for 10kV-20kV distribution lines according to claim 1, characterized in that, A current transformer (10) is provided in the lower metal head (3). The induction coil of the current transformer (10) is electromagnetically coupled with the power distribution line conductor (8) to generate induced voltage and induced current, thereby supplying power to the lightning strike counter (5), the failure alarm (6) and the signal transmitter (7).

3. The intelligent insulator with surge arrester for 10kV~20kV distribution lines according to claim 2, characterized in that, The signal transmitter (7) has a built-in lithium battery, which is used to power the signal transmitter (7) when the current transformer (10) does not generate induced voltage and induced current.

4. The intelligent insulator with surge arrester for 10kV-20kV distribution lines according to claim 1, characterized in that, The bottom of the inner wall of the insulator (1) is provided with a thermal pad that is connected to the fault alarm (6) for signal transmission. The thermal pad is used to collect the heat generated when the lightning current passes through the surge arrester body (4), and to collect the abnormal heat generated by the power frequency follow current when the insulator (1) loses its insulation function or the surge arrester body (4) fails and short-circuits, and to issue an action command. The action command is used to trigger the fault alarm (6) to alarm.

5. The intelligent insulator with surge arrester for 10kV-20kV distribution lines according to claim 1, characterized in that, The upper metal head (2) includes an upper pressure plate (21) and a lower pressure plate (22). The lower pressure plate (22) is fixedly connected to the insulator (1). The lower pressure plate (22) and the upper pressure plate (21) are respectively provided with cavities (23). The lower pressure plate (22) and the two sides of the cavity (23) are provided with first fixing bolts (24). The first fixing bolts (24) pass through the upper pressure plate (21). The first fixing bolts (24) are provided with first fixing nuts (25) for locking the upper pressure plate (21) and the lower pressure plate (22). When the upper pressure plate (21) and the lower pressure plate (22) are locked, the two cavities (23) cooperate to clamp the power distribution line conductor (8).

6. The intelligent insulator with surge arrester for 10kV-20kV distribution lines according to claim 5, characterized in that, A spring pressure plate (26) is provided between the cavity (23) and the power distribution line conductor (8). The spring pressure plate (26) is corrugated and arranged along the inner wall of the cavity (23). A second fixing bolt (27) is provided on the spring pressure plate (26) and fixedly connected to the cavity (23). The spring pressure plate (26) is used to eliminate the vibration of the power distribution line conductor (8) under wind force and to avoid the occurrence of longitudinal tension imbalance caused by thermal expansion and contraction.

7. The intelligent insulator with surge arrester for 10kV-20kV distribution lines according to claim 1, characterized in that, A third fixing bolt (31) is provided on the lower metal head (3), the third fixing bolt (31) passes through the crossbeam (9), and a second fixing nut (32) is provided on the third fixing bolt (31) for locking the lower metal head (3) and the crossbeam (9).

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