Device for inhibiting lightning flashover tripping of insulator of power transmission line

Abstract

The invention provides a device for inhibiting lightning flashover tripping of an insulator of a power transmission line, which relates to the technical field of lightning protection of power transmission lines and comprises a high-frequency filter, a low-wave impedance channel and a phase-change material electric field energy absorber, the high-frequency filter is arranged on one side, close to a tower, of the overhead lightning conductor and is used for carrying out wave blocking on lightning current generated by lightning stroke; the low-wave impedance channel is connected with the input end of the phase-change material electric field energy absorber through a coaxial cable and used for guiding lightning current into the phase-change material electric field energy absorber. The phase-change material electric field energy absorber is arranged at the position, close to the ground, of the tower, the output end of the phase-change material electric field energy absorber is connected with the tower and then grounded, and the phase-change material electric field energy absorber is used for absorbing electric field energy of lightning current. The operation reliability of the power system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of lightning protection for power transmission lines, and in particular to a device for suppressing lightning flashover tripping of insulators of power transmission lines. Background Art

[0002] Overhead transmission lines are in contact with transmission conductors through insulators to ensure electrical insulation of the conductors from the surrounding environment, and the insulators are fixed to supporting towers. However, these lines may generate electromagnetic interference to the surrounding environment, and existing overhead transmission lines are vulnerable to lightning strikes, which can easily lead to flashover short circuits and tripping between phases and ground, and in extreme cases may even cause fires.

[0003] In the existing transmission line lightning protection system, lightning arresters are the main lightning protection means. However, in DC transmission lines, due to the high cost of DC lightning arresters, they are usually not installed throughout the line, and the design of high-voltage lightning arresters generally includes gaps, which are usually located between the lightning arrester and the conductor. This gap design may cause polarity effects when the dielectric impedance discharges, thereby significantly reducing the action sensitivity of the lightning arrester, which in turn leads to the fact that in the case of lightning strikes, although the insulator may have flashed over, the lightning arrester fails to respond in time or does not act at all.

[0004] Therefore, a transmission line protection device that can effectively guide electric field energy and reduce the impact of lightning strikes on power transmission needs to be studied urgently. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned prior art, the present invention provides a device for suppressing lightning flashover tripping of transmission line insulators, which solves the technical problem that the prior art relies on lightning arresters to effectively guide the electric field energy generated by lightning strikes, resulting in an impact on power transmission and causing flashover of insulators.

[0006] The present invention provides a device for suppressing lightning flashover tripping of transmission line insulators, comprising: a high-frequency filter, a low-wave impedance channel and a phase-change material electric field energy absorber;

[0007] The high-frequency filter is arranged on a side of the overhead lightning protection line close to the pole tower, and the high-frequency filter is used to block the lightning current generated by the lightning strike;

[0008] The first end of the low-wave impedance channel is connected to an end of the high-frequency filter away from the pole tower, the second end of the low-wave impedance channel is connected to the input end of the phase change material electric field energy absorber, and the low-wave impedance channel is used to introduce lightning current into the phase change material electric field energy absorber;

[0009] The phase change material electric field energy absorber is arranged at a pole tower close to the ground, and the output end of the phase change material electric field energy absorber is connected to the pole tower and then grounded, so as to absorb the electric field energy of the lightning current and convert and output the electric field energy.

[0010] Optionally, the high-frequency filter includes a high-permeability iron core, and the high-permeability iron core is sleeved on the outer wall of the overhead lightning protection line.

[0011] Optionally, the high permeability iron core is a circular ring structure with an opening.

[0012] Optionally, the phase change material electric field energy absorber is an RC resistor-capacitor pulse absorber with a high dielectric constant.

[0013] Optionally, the low-impedance channel is a high-voltage-resistant low-impedance high-frequency coaxial communication cable.

[0014] Optionally, an inductor is provided on the overhead lightning arrester, and the inductor is connected in series with the high-frequency filter.

[0015] Optionally, a three-phase conductor is connected between two adjacent pole towers, and the overhead lightning protection line is connected to the three-phase conductor via a first capacitor.

[0016] Optionally, the three-phase conductor includes an A-phase conductor, a B-phase conductor and a C-phase conductor arranged in sequence from the top of the tower to the bottom of the tower, and insulators are provided at both ends of the A-phase conductor, the B-phase conductor and the C-phase conductor;

[0017] The overhead lightning protection line is connected to the A-phase conductor via the first capacitor, and a second capacitor is connected between the B-phase conductor and the C-phase conductor.

[0018] Optionally, both ends of the overhead lightning protection line are connected to adjacent pole towers through the high-frequency filter, and each pole tower is provided with the phase change material electric field energy absorber close to the ground, and each phase change material electric field energy absorber is connected to the high-frequency filter connected to the corresponding pole tower through the low-wave impedance channel.

[0019] Optionally, the device further comprises an energy recovery and utilization system;

[0020] The energy recovery and utilization system is connected to the phase change material electric field energy absorber and is used for recovering and utilizing the energy absorbed by the phase change material electric field energy absorber.

[0021] The device for suppressing lightning flashover tripping of transmission line insulators provided by the present invention installs and fixes a high-frequency filter on one side of the overhead lightning arrester close to the pole tower, blocks the lightning current generated by lightning strikes, effectively prevents lightning currents from entering the power system, and reduces the impact of lightning strikes on transmission lines; then guides the lightning current to be transmitted to the phase change material electric field energy absorber through a low wave impedance channel, avoids the lightning current from propagating along other paths, and reduces the risk of flashover of insulators; the phase change material electric field energy absorber converts the electric field energy in the lightning current and releases it safely, reducing the impact and damage to power equipment. The above device can effectively absorb and process lightning currents, reduce the probability of flashover phenomena and transmission line tripping caused by lightning strikes in insulators in the power system, and improve the operational stability of the power system.

[0022] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0023] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 A schematic structural diagram of a device for suppressing lightning flashover tripping of an insulator of a transmission line in an embodiment provided in the present application;

[0026] Figure 2 A schematic diagram of the structure of a high-frequency filter in a device for suppressing lightning flashover tripping of insulators of a transmission line in an embodiment provided in the present application.

[0027] In the figure:

[0028] 1. High-frequency filter; 101. High-permeability iron core; 2. Low wave impedance channel; 3. Phase change material electric field energy absorber; 4. Overhead lightning arrester; 5. Pole tower; 6. A-phase conductor; 7. B-phase conductor; 8. C-phase conductor; 9. Insulator;

[0029] L1, inductor; C1, first capacitor; C2, second capacitor; Cj, distributed capacitor;

[0030] I1, first current; I2, second current; I3, third current; I4, fourth current. DETAILED DESCRIPTION

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The present invention provides a device for suppressing lightning flashover tripping of insulators of power transmission lines, such as Figure 1 As shown, it includes a high-frequency filter 1, a low-wave impedance channel 2 and a phase change material electric field energy absorber 3; the high-frequency filter 1 is arranged on the side of the overhead lightning protection line 4 close to the pole tower 5, and the high-frequency filter 1 is used to block the lightning current generated by the lightning strike; the first end of the low-wave impedance channel 2 is connected to the end of the high-frequency filter 1 away from the pole tower 5, and the second end of the low-wave impedance channel 2 is connected to the input end of the phase change material electric field energy absorber 3, and the low-wave impedance channel 2 is used to introduce the lightning current into the phase change material electric field energy absorber 3; the phase change material electric field energy absorber 3 is arranged near the ground of the pole tower 5, and the output end of the phase change material electric field energy absorber 3 is connected to the pole tower 5 and then grounded, so as to absorb the electric field energy of the lightning current, and convert and output the electric field energy.

[0035] The device for suppressing lightning flashover tripping of transmission line insulators provided by the present invention installs and fixes the high-frequency filter 1 on the side of the overhead lightning conductor 4 close to the pole tower 5, blocks the lightning current generated by the lightning strike, effectively prevents the lightning current from entering the power system, and reduces the impact of the lightning strike on the transmission line; then guides the lightning current to the phase change material electric field energy absorber 3 through the low wave impedance channel 2, avoids the lightning current from propagating along other paths, and reduces the risk of flashover of the insulator 9; the phase change material electric field energy absorber 3 converts the electric field energy in the lightning current and releases it safely, reducing the impact and damage to the power equipment. The above device can effectively absorb and process lightning current, reduce the probability of flashover caused by lightning strikes on insulators 9 in the power system and the tripping of the transmission line, and improve the operational stability of the power system.

[0036] Specifically, in the above embodiment, if Figure 2 As shown, the high frequency filter 1 comprises a high magnetic permeability iron core 101 , and the high magnetic permeability iron core 101 is sleeved on the outer wall of the overhead lightning protection line 4 .

[0037] Furthermore, the high permeability iron core 101 is a circular ring structure with an opening.

[0038] Among them, the high-frequency filter 1 specifically includes a high-permeability iron core 101, whose magnetic permeability μ>500. The high-permeability iron core 101 is a circular ring structure, which is wrapped around the outer wall of the overhead lightning conductor 4 after opening, so as to increase the electromagnetic impedance under magnetic induction and suppress the current flowing to the pole tower 5 under high frequency, so that the current value is reduced as much as possible. Its inductance is required to be>50μH.

[0039] In this embodiment, the high permeability iron core 101 can significantly enhance the concentration effect of the magnetic field, so that the high-frequency filter 1 can more effectively block the high-frequency components in the lightning current, which helps to reduce the chance of lightning current entering the power system, thereby protecting other key components from damage; the high permeability iron core 101 is designed as a circular ring structure with an opening, which can be conveniently installed on the existing overhead lightning protection line 4, and the opening design can reduce the eddy current effect generated inside the iron core to a certain extent, reduce energy loss, and improve filtering efficiency.

[0040] Specifically, in the above embodiment, the phase change material electric field energy absorber 3 is an RC resistor-capacitor pulse absorber with a high dielectric constant.

[0041] The electric field energy absorbed by the phase change material electric field energy absorber 3 is greater than 5×10 4 joule.

[0042] In this embodiment, the RC resistor-capacitor pulse absorber can respond quickly to instantaneous high voltage and current changes, and effectively absorb the electric field energy in lightning strikes or other transient events; the use of high dielectric constant materials can increase the energy storage capacity of the capacitor, store more energy in the same volume, and thus more efficiently handle high-intensity energy impacts; by reasonably configuring resistance parameters and capacitance parameters, the RC resistor-capacitor pulse absorber can smooth the input transient waveform, reduce the impact of spike voltage on subsequent circuits, provide more stable output characteristics when processing energy, and avoid system instability caused by energy fluctuations; ultimately, by converting and processing the electric field energy of the lightning current, the stability of the power system operation is maintained.

[0043] Specifically, in the above embodiment, the low wave impedance channel 2 is a low wave impedance high frequency coaxial communication cable that can withstand high voltage.

[0044] The wave impedance value of the low wave impedance channel 2 is required to be Z<100Ω, and the high voltage withstand voltage value is greater than 100kV.

[0045] In this embodiment, the low wave impedance characteristics of the communication cable ensure that the resistance encountered by the lightning current during the transmission process is minimized, so that the lightning current can be efficiently transmitted from the high-frequency filter 1 to the phase change material electric field energy absorber 3, reducing energy loss and improving the overall operating efficiency of the power system. In addition, due to the low wave impedance, the characteristic impedance of the load end can be better matched, thereby reducing signal reflection and standing wave phenomena, and ensuring stable energy transmission; the high-voltage resistance characteristics of the communication cable enable the cable to work safely under extreme conditions, will not be broken down or damaged due to high voltage, and can cope with transient high-energy events such as lightning strikes. At the same time, the high-voltage resistance characteristics enhance the safety of the entire device.

[0046] Specifically, in the above embodiment, the overhead lightning protection line 4 is provided with an inductor L1 , and the inductor L1 is connected in series with the high-frequency filter 1 .

[0047] In this embodiment, the inductor L1 also has a high impedance to high-frequency current, which can further suppress the high-frequency component in the lightning current. When the inductor L1 is connected in series with the high-frequency filter 1, the two work together to more effectively block the high-frequency lightning current from entering the power system; among them, the inductor L1 can smooth the rapid changes in current, reduce the impact of peak current in lightning current on the system, enhance the filtering effect of the entire circuit, make the current more stable, effectively protect the power equipment from high-frequency interference and transient voltage, and help the subsequent energy absorption and conversion process.

[0048] Specifically, in the above embodiment, a three-phase conductor is connected between two adjacent towers 5, and the overhead lightning protection line 4 is connected to the three-phase conductor via the first capacitor C1.

[0049] Furthermore, the three-phase conductor includes an A-phase conductor 6, a B-phase conductor 7 and a C-phase conductor 8 arranged in sequence from the top of the tower 5 to the bottom of the tower 5, and insulators 9 are provided at both ends of the A-phase conductor 6, the B-phase conductor 7 and the C-phase conductor 8; the overhead lightning arrester 4 is connected to the A-phase conductor 6 through a first capacitor C1, and a second capacitor C2 is connected between the B-phase conductor 7 and the C-phase conductor 8.

[0050] In this embodiment, specifically combined with Figure 1 The direction of the current when a lightning strike occurs is described. When a lightning strike occurs, the lightning strike point is on the overhead lightning conductor 4. After the lightning current passes through the inductor L1, a first current I1 is formed. After the first current I1 is subjected to the wave blocking effect of the high-frequency filter 1, a fourth current I4 is formed in one branch, which flows into the phase change material electric field energy absorber 3 through the low wave impedance channel 2. In the other branch, a small amount of the third current I3 flows through the high-frequency filter 1 and then flows into the ground through the tower 5. Considering that a first capacitor C1 is also connected between the overhead lightning conductor 4 and the A-phase conductor 6, the high-frequency component in the lightning current is coupled to the A-phase conductor 6, that is, the second current I2 in the figure flows on the A-phase conductor 6, and at the same time, there is a certain space induction current flowing through the B-phase conductor 7 and the C-phase conductor 8.

[0051] There is a physical property called distributed capacitance Cj between the terminals of the insulator 9 , and the distributed capacitance Cj is caused by the material and structure of the insulator 9 itself, and manifests itself as the effect of a capacitor in electrical engineering.

[0052] Specifically, in the above embodiment, both ends of the overhead lightning protection line 4 are connected to the adjacent pole towers 5 through the high-frequency filter 1, and each pole tower 5 is provided with a phase change material electric field energy absorber 3 near the ground, and each phase change material electric field energy absorber 3 is connected to the high-frequency filter 1 connected to the corresponding pole tower 5 through a low wave impedance channel 2.

[0053] In this embodiment, high-frequency filters 1 are provided at both ends of the overhead lightning protection line 4, and each pole tower 5 is configured with a low-wave impedance channel 2 and a phase change material electric field energy absorber 3, so that the lightning current can be more evenly dispersed to each pole tower 5, avoiding excessive pressure on a single point and reducing the risk of local failures; by efficiently managing and dispersing the lightning current, the probability of insulator 9 flashover and other electrical failures caused by lightning strikes is reduced, and the continuity and reliability of power supply are improved.

[0054] Specifically, in the above embodiment, the device also includes an energy recovery and utilization system; the energy recovery and utilization system is connected to the phase change material electric field energy absorber 3, and is used to recover and utilize the energy absorbed by the phase change material electric field energy absorber 3.

[0055] In this embodiment, the main function of the phase change material electric field energy absorber 3 is to absorb the electric field energy in lightning current or other transient high-energy events and convert it into heat energy or other forms of energy, thereby protecting the power system from damage. In addition to directly discharging the energy to the ground, it can also be connected to other devices for further processing or utilization of the energy; in this application, the phase change material electric field energy absorber 3 can be connected to an energy recovery and utilization system. The energy recovery and utilization system can specifically be an energy storage device, such as a battery energy storage system, which can temporarily store the absorbed energy and release it later as needed; it can be a heat energy recovery and utilization system, such as a heat exchanger or a thermoelectric generator; it can also be a cooling system, such as a heat sink or a fan or a liquid cooling device.

[0056] The theoretical basis for the use of the lightning flashover tripping device for suppressing the transmission line insulator provided by the present application is as follows: first, when the lightning strikes the center of the shielding distance of the overhead lightning arrester 4, the simplified calculation of the high-frequency component coupled to the phase conductor is as follows: in a branch inductive channel, that is, the inductive reactance value XL of the ground wire is calculated. According to the "Building Lightning Protection Design Code", the inductance value of the grounding down conductor is L=1.89μH / M. When the shielding distance is 1 / 2 of the ground wire length, that is, S=150M, the ground wire inductance is L=1.89x150=283μH, and the lightning frequency negative ground flash (when the frequency is 250kHz), the ground wire inductance is XL=2πfL=2πx250x103x283x10 -6 =444Ω, that is, the high-frequency impedance XL between the lightning current from the lightning strike point to the entrance of the low-wave impedance channel 2 is 444Ω, and the impedance value X at the power frequency is only about 0.5Ω; and for the other branch capacitive channel, according to the "Power System Design Manual", the equivalent distributed capacitance per unit length between the ground wire of the overhead lightning arrester 4 and the A-phase conductor 6 is C 0 =0.01374μF, when the tower distance is 300M, the first capacitor C1=0.3x0.01374=0.0041μF=4.1nF; and the distributed capacitance at both ends of the insulator 9 is Cj=13.5x15=200PF. Based on this, the impedance value of the capacitive channel is actually composed of the first capacitor C1 and the distributed capacitance Cj in series. The distributed equivalent capacitance value of these two capacitors in series is still the smaller one, that is, C=200PF, then the impedance of the capacitive channel XC=1 / 2πfc, when the lightning current frequency is still f=250kHz, XC=3333Ω.

[0057] After the above calculation, the inductive impedance value of the branch inductive channel is XL=444Ω; the capacitive impedance value of the branch capacitive channel is XC=3333Ω, and the difference between the two is only 7.5 times; assuming that when lightning strikes the center of the overhead lightning arrester 4, the lightning current corresponding to the breakdown conductor under different arrangements of the overhead lightning arrester 4 and the overvoltage value are as shown in the following table, when the current is 50kA, U1=1201kV, at this time, when the amplitude of the high-frequency voltage component flowing through the insulator 9 is set to 15% of U1, that is, U1.1=180.2kV, the high-frequency impact current Ij flowing through the insulator 9 is I1.1 / XC=54A, so the high-frequency component current Ij flowing through the insulator 9, that is, the high-frequency current between the phase conductor and the tower 5 reaches 54A, which will cause flashover discharge of the insulator 9 and trigger power frequency continuous current, thereby causing the line to trip.

[0058] Lightning current amplitude (kA) Single lightning conductor Double lightning protection line 25 633.3 600.6 50 1266.5 1201.2 75 1899.8 1801.9 100 2533.0 2402.5 125 3100.4 3003.1 150 3235.7 3603.7 175 3639.0 4135.9 200 4184.1 4527.7 225 4271.2 4724.5

[0059] Table 1

[0060] Table 1 shows the overvoltage value generated at the top of the tower when lightning strikes the top of a single lightning conductor and a double lightning conductor tower. It can be seen from the above calculation that when lightning strikes the center of the lightning conductor shielding distance, it should be considered that after the high-frequency electric field of lightning is coupled to the phase conductor, the high-frequency current of 50A will cause high-frequency leakage current, which will cause the insulator 9 to be broken down and cause a line tripping fault. After the device provided by the present application is installed, the equivalent capacitance C of the device provided by the present application is ≥25μF, and when the frequency f=250kHz, the equivalent capacitive reactance XC4=1 / 2πfc=0.025Ω of the fourth current I4 is less than XC=3333Ω, so the lightning current will turn to the low wave impedance channel 2 to prevent the lightning current from flowing to the three-phase conductor.

[0061] Those skilled in the art will appreciate that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present application. Those skilled in the art will appreciate that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the description of the implementation scenario, or can be changed accordingly and located in one or more devices different from the present implementation scenario. The modules of the above-mentioned implementation scenario can be combined into one module, or can be further split into multiple submodules.

[0062] The above serial numbers of this application are only for description and do not represent the advantages and disadvantages of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of this application, but this application is not limited to them, and any changes that can be thought of by technicians in this field should fall within the scope of protection of this application.

Claims

1. A device for suppressing lightning flashover tripping of transmission line insulators, characterized in that: include: A high frequency filter (1), a low wave impedance channel (2) and a phase change material electric field energy absorber (3); The high-frequency filter (1) is arranged on a side of the overhead lightning protection line (4) close to the pole tower (5), and the high-frequency filter (1) is used to block the lightning current generated by a lightning strike; The first end of the low-wave impedance channel (2) is connected to an end of the high-frequency filter (1) away from the pole tower (5), and the second end of the low-wave impedance channel (2) is connected to the input end of the phase change material electric field energy absorber (3). The low-wave impedance channel (2) is used to guide the lightning current into the phase change material electric field energy absorber (3); The phase change material electric field energy absorber (3) is arranged on a pole tower (5) close to the ground, and the output end of the phase change material electric field energy absorber (3) is connected to the pole tower (5) and then grounded, so as to absorb the electric field energy of the lightning current and convert and output the electric field energy.

2. The device for suppressing lightning flashover tripping of transmission line insulators according to claim 1 is characterized in that: The high-frequency filter (1) comprises a high-permeability iron core (101), and the high-permeability iron core (101) is sleeved on the outer wall of the overhead lightning protection line (4).

3. The device for suppressing lightning flashover tripping of transmission line insulators according to claim 2, characterized in that: The high magnetic permeability iron core (101) is a circular ring structure with an opening.

4. The device for suppressing lightning flashover tripping of transmission line insulators according to claim 1, characterized in that: The phase change material electric field energy absorber (3) is an RC resistor-capacitor pulse absorber with a high dielectric constant.

5. The device for suppressing lightning flashover tripping of transmission line insulators according to claim 1, characterized in that: The low wave impedance channel (2) is a high-voltage-resistant low wave impedance high-frequency coaxial communication cable.

6. The device for suppressing lightning flashover tripping of transmission line insulators according to claim 1, characterized in that: An inductor is provided on the overhead lightning protection line (4), and the inductor is connected in series with the high-frequency filter (1).

7. The device for suppressing lightning flashover tripping of transmission line insulators according to claim 1, characterized in that: A three-phase conductor is connected between two adjacent pole towers (5), and the overhead lightning protection line (4) is connected to the three-phase conductor via a first capacitor.

8. The device for suppressing lightning flashover tripping of transmission line insulators according to claim 7, characterized in that: The three-phase conductor comprises an A-phase conductor (6), a B-phase conductor (7) and a C-phase conductor (8) which are arranged in sequence from the top of the pole tower (5) to the bottom of the pole tower (5), and insulators (9) are provided at both ends of the A-phase conductor (6), the B-phase conductor (7) and the C-phase conductor (8); The overhead lightning protection line (4) is connected to the A-phase conductor (6) via the first capacitor, and a second capacitor is connected between the B-phase conductor (7) and the C-phase conductor (8).

9. The device for suppressing lightning flashover tripping of transmission line insulators according to claim 1, characterized in that: Both ends of the overhead lightning protection line (4) are connected to adjacent pole towers (5) via the high-frequency filter (1), and each pole tower (5) is provided with a phase change material electric field energy absorber (3) near the ground, and each phase change material electric field energy absorber (3) is connected to the high-frequency filter (1) connected to the corresponding pole tower (5) via the low-wave impedance channel (2).

10. The device for suppressing lightning flashover tripping of transmission line insulators according to claim 1, characterized in that: The device also includes an energy recovery and utilization system; The energy recovery and utilization system is connected to the phase change material electric field energy absorber (3) and is used to recover and utilize the energy absorbed by the phase change material electric field energy absorber (3).

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