226results about "Discharge by conduction/dissipation" patented technology

The invention provides a fault indication device of a lightning arrester and the lightning arrester. The fault indication device comprises a target resistor, a low-melting-point alloy, a counterweight and a shell, the target resistor, the low-melting-point alloy and the counter weight are all located in the shell; the first end of the target resistor is connected with a shell of the lightning arrester, the second end of the target resistor is grounded, the upper end of the low-melting-point alloy is in fixed contact with the target resistor, and the lower end of the low-melting-point alloy is connected with the balance weight; the shell comprises a visual subarea at the bottom; the target resistor generates different heat according to the magnitude of the leakage current of the lightning arrester, and when the temperature of the target resistor is higher than the melting point temperature of the low-melting-point alloy, the low-melting-point alloy is melted, and the counterweight falls into the visual partition. According to the device, by triggering melting of the low-melting-point alloy, advanced visual early warning can be provided before the lightning arrester breaks down, and the problem that fault indication of the lightning arrester is not timely is solved.

The invention relates to the technical field of lightning protection, in particular to a positioning clamp for an ancient building lightning protection device, which comprises a mounting seat, a plurality of support frames are rotatably connected to the mounting seat, a cornice clamp mechanism is rotatably connected to one end of each support frame, and a protective seat is movably clamped to one support frame. A mounting frame is rotationally connected in the protection seat, a lightning rod is rotationally connected in the mounting frame, a retracting and releasing mechanism is rotationally connected to the inner wall of one end of the mounting frame, and an arc-shaped brush plate is arranged in the mounting frame in a sliding fit mode. The lightning protection device is installed on the ancient building pavilion, has higher adaptability, stability and attractiveness, can accurately adapt to a cornice structure, avoids damage to a building, improves installation convenience, improves safety and stability of the lightning protection device, and ensures the lightning protection effect of the pavilion and building integrity.

The present application provides a regional lightning protection method, device, equipment and readable storage medium. The present application can determine the geographical environment parameters and geometric shape parameters of the target protection area; and further determine the regional area of ​​the target protection area based on the geographical environment parameters and geometric shape parameters of the target protection area; and can also determine the lightning strike path of the target protection area; so that the protection range of the target protection area can be determined based on the lightning strike path of the target protection area and the regional area of ​​the target protection area; after determining the protection range of the target protection area, a plurality of target lightning protection devices can be further installed within the protection range of the target protection area to protect the target protection area from lightning strikes.

The embodiment of the invention provides a power transmission line combined protection device, and relates to the technical field of power transmission line protection devices, and the power transmission line combined protection device comprises a support which is provided with a first wiring piece, a second wiring piece and a third wiring piece which are used for being connected with a power transmission line; the fuse is arranged on the support, one end of the fuse is electrically connected to the first wiring piece, and the other end of the fuse is electrically connected to the second wiring piece; the lightning arrester is arranged on the support, one end of the lightning arrester is electrically connected to the first wiring piece, and the other end of the lightning arrester is electrically connected to the third wiring piece. According to the power transmission line combined protection device provided by the embodiment of the invention, the problem that the installation effect of a protection device in the prior art is relatively poor is solved.

The invention belongs to the field of lightning arresters, particularly relates to a rapid replacement device and a rapid disassembly method for a line lightning arrester, and provides the following scheme aiming at the problems that an existing line lightning arrester usually needs to use various tools, the disassembly process is also complicated, each fastener needs to be disassembled step by step, and the fasteners may loosen. The lightning arrester comprises a lightning arrester body and a mounting frame, a fixed outer cylinder is fixedly embedded in the mounting frame, a mounting top plate is fixedly mounted at the bottom of the lightning arrester body, and two limiting vertical plates which are symmetrically arranged are slidably connected to the bottom of the mounting top plate. According to the technical scheme, by arranging the rotary limiting disc and mutual cooperation of all the components, when the mounting top plate can be quickly inserted into the fixed outer cylinder to complete mounting and dismounting, the mounting top plate can be directly pulled out finally by rotating the rotary limiting disc, driving a series of components to act and releasing all clamping and limiting states, and the whole process is easy to operate and does not need additional tools.

The invention provides an IGCT-based hybrid commutation converter valve and a valve assembly thereof. The influence on the performance of the converter valve due to the fact that the consistency of IGCT devices is difficult to guarantee can be reduced and even avoided. In order to solve the technical problem, the hybrid commutation converter valve provided by the invention comprises a valve assembly, the valve assembly comprises a plurality of gate commutation thyristors which are sequentially arranged along a first direction, the valve assembly further comprises a radiator row, and the radiator row comprises a plurality of radiators which are sequentially arranged along the first direction; each gate commutated thyristor is clamped between two adjacent radiators; the valve assembly further comprises a lightning arrester assembly, the lightning arrester assembly comprises lightning arrester units, and each lightning arrester unit comprises a lightning arrester or a plurality of lightning arresters connected in parallel. Each lightning arrester unit is connected with two adjacent radiators in the radiator row so as to be connected with the gate commutated thyristor between the two adjacent radiators in parallel, and each gate commutated thyristor is connected with one corresponding lightning arrester unit in parallel.

Disclosed in the present invention is a surface-mounted lightning protection strip on a parapet, comprising a rectangular insertion slot formed on one side of the top of a marble plate; a through communicating hole is formed in one end of the top of the rectangular insertion slot, and galvanized flat steel is inserted to the inner wall of the rectangular insertion slot; a concrete test block is placed at the top of the communicating hole, a central through hole being penetratingly formed in the center of the concrete test block; positioning clamping slots are formed in the four sides of the concrete test block, and a rectangular positioning frame is fixed to the bottom of the concrete test block; symmetrically-distributed L-shaped hanging plates are welded to the outer wall of one side of the rectangular positioning frame, and a fixing plate is welded to the outer wall of the other side of the rectangular positioning frame. In the present invention, during lightning protection, a round-steel lightning protection strip is used for rapid lightning protection, a lightning rod is snap-fitted and mounted at the top of the round-steel lightning protection strip to further improve the lightning protection effect, and a triangular support structure at the bottom has sufficient stability, thus avoiding inclination of the lightning rod after fixation.

The present invention belongs to the technical field of conductor erection of overhead distribution lines, and specifically relates to a conductor erection structure and method for overhead distribution lines of 10kV and below, wherein the conductor erection structure comprises a conductor, the outer part of the conductor is wrapped with armor, the armor comprises a protective sleeve, and a discharge tip is rotatably arranged in the protective sleeve; a traction head and a connector are respectively arranged at both ends of the conductor, and the traction head is connected to an insulator on a pole tower through a joint; a rotation control mechanism for controlling the rotation of the discharge tip is arranged on the connector, and in the process of controlling the rotation of the discharge tip by the rotation control mechanism, the axis of the discharge tip and the axis of the conductor are in the same plane, and an elastic support rod is also arranged in the protective sleeve, a rotating shaft is rotatably installed on the elastic support rod, a conductive mounting seat is sleeved on the rotating shaft, and the discharge tip is installed on the conductive mounting seat. The present invention can effectively slow down the wear speed of the conductor, and make the conductor have lightning protection performance, thereby improving the service life and safety of the conductor.

According to the lightning counterattack prevention system for the unmanned aerial vehicle nest on the power transmission line iron tower, the nest shell is in insulated connection with the iron tower, the voltage generated when lightning current is discharged to the nest can be directly reduced, the counterattack probability is reduced, meanwhile, a grounding terminal is arranged in a matched mode, the shell is directly connected with a down lead of an iron tower footing, and if redundant lightning current exists, the lightning counterattack probability is reduced. And the down lead is continuously released, so that the safety of the nest is ensured.

An optimized PLP placement method for plateau and mountain wind farms is provided. Starting from the outermost wind turbines, it measures turbine parameters. Firstly, install the first PLP to safeguard the outermost ones. Then, combine its parameters with those of the tallest turbine near the center to set up the second PLP, protecting turbines within a connection range. Next, use the previous step's parameters and those of the tallest turbine in the vertical area of the first two PLPs' plane to install the third PLP, shielding turbines in the area formed by three points. Repeat until covering the whole farm. Many cases prove its reliability, economy and suitability for wide application in optimizing PLP placement.

The invention discloses an offshore wind power plant lightning arrester dynamic configuration method based on multi-overvoltage cooperative suppression, and belongs to the field of offshore wind power plant lightning arrester configuration, and the method comprises the following steps: S1, obtaining an offshore lightning parameter statistical result; s2, establishing an offshore wind turbine lightning stroke electromagnetic transient simulation model, and obtaining a critical lightning current corresponding to an overvoltage insulation tolerance level on a cable in the offshore wind turbine; s3, calculating to obtain an overvoltage tolerance probability; and S4, on the premise of considering the requirements of an operator, evaluating the lightning protection effects of various lightning arrester configuration schemes based on the overvoltage tolerance probability, and obtaining an optimal lightning arrester configuration scheme. By adopting the dynamic configuration method of the offshore wind plant lightning arrester based on multi-overvoltage collaborative suppression, through quantification of lightning randomness, multi-index collaborative evaluation and cost-lightning protection effect balance, the limitation of a traditional method is solved, and a scientific, flexible and practical decision-making tool is provided for configuration of the offshore wind plant lightning arrester.

The invention relates to the technical field of prefabricated building construction, and particularly discloses a lightning protection downlead connecting structure in a prefabricated building and a construction method thereof.The lightning protection downlead connecting structure comprises a first clamping plate, a threaded rod is fixedly arranged on the first clamping plate, a nut is installed on the threaded rod in a threaded mode, a second clamping plate is slidably installed on the threaded rod, and a fixed clamping groove is formed in the first clamping plate; a movable clamping groove matched with the fixed clamping groove is formed in the second clamping plate, a rubber corrugated pipe is arranged in the fixed clamping groove, a connecting piece is installed between the corrugated pipe and the fixed clamping groove, metal plugging plates are fixedly arranged at the two ends of the corrugated pipe, a rubber elastic piece is arranged between the two plugging plates, a cavity is formed in the elastic piece, and conductive liquid is contained in the corrugated pipe. Through cooperation of the corrugated pipe, the elastic piece, the conductive liquid and the plugging plate, when the round steel downleads vibrate, the plugging plate is tightly attached to the end faces of the corresponding round steel downleads, current transmission between every two adjacent round steel downleads is not affected, the lightning discharge probability is reduced, and safety is improved.

The invention discloses a power system overvoltage protection device, and belongs to the technical field of power overvoltage protection. An overvoltage protection device of a power system comprises a main lightning arrester, a standby lightning arrester and a supporting frame used for bearing the main lightning arrester and the standby lightning arrester, the standby lightning arrester is detachably connected with the supporting frame through a second separation assembly, a first separation assembly is arranged on the lower portion of the main lightning arrester, and a second separation assembly is arranged on the lower portion of the standby lightning arrester. The first separating assembly is detachably connected to the second separating assembly through the connecting assembly. According to the invention, through the arrangement of the standby lightning arrester, the standby lightning arrester can be temporarily used as the main lightning arrester on the top of the standby lightning arrester after the main lightning arrester breaks down and then falls off through the first separation assembly, so that the vacuum period of protection is reduced; therefore, the problem that in the prior art, a drop-type lightning arrester for overvoltage protection has a protection vacuum period after a fault is solved.

The invention relates to the technical field of lightning protection devices, in particular to an extensible assembly type steel structure for ancient pagoda lightning protection, which comprises a bottom box and further comprises a shear fork frame, the shear fork frame is eccentrically arranged on the bottom box, the shear fork frame is of an arc-shaped structure when stretching out and drawing back, and a hydraulic cylinder for driving the shear fork frame to stretch out and draw back is arranged in the bottom box. According to the extensible assembly type steel structure for anti-thunder protection of the ancient tower, the shear shank is eccentrically connected, under the action of the hydraulic cylinder, lateral curve extension of the shear shank can be achieved, when the shear shank extends to the maximum degree, the top ejector rod is in a vertical state and serves as a lightning rod, the ancient tower is prevented from being struck by lightning, and the service life of the ancient tower is prolonged. The defect that the original structure and appearance of the ancient tower are possibly damaged due to the fact that existing lightning protection measures need to be arranged on the tower body foundation is overcome, instant judgment can be conducted according to weather conditions, flexibility is high, and the defect that the existing lightning protection measures cannot be dismantled once being arranged is overcome.

The invention describes a lightning receptor assembly (1) for a wind turbine rotor blade (20), comprising a receptor unit (10R, 10B) comprising a receptor base (10B) for installation in the rotor blade interior (200) and a receptor (10R) for placement at an outer surface (20S) of the rotor blade (20); a threaded connector (11) to form a mechanical connection between the receptor (10R) and the receptor base (10B); and a conductive band (12) adapted to extend over the outer surface (20S) of the rotor blade (20) and to form an electrical connection to the receptor unit (10R, 10B) without requiring removal of the receptor (10R) from the receptor base (10B). The invention further describes a wind turbine (2) and a method of preforming a maintenance procedure on a lightning receptor assembly (1) of a rotor blade (20) of a wind turbine (2).

The invention discloses a lightning arrester for an air duct of a circulating water cooling tower. The lightning arrester comprises an L-shaped support, a lightning strip fixing piece, a vibration reduction piece, an elastic support and a lightning strip assembly. The L-shaped support comprises a first arm part and a second arm part which are perpendicular to each other, the longitudinal extension length of the first arm part is larger than the transverse extension length of the second arm part, the second arm part is fixedly connected with the air duct, and an elastic support is arranged between the second arm part and the air duct; one side, far away from the air duct, of the first arm part is fixedly connected with a vibration reduction part, the other end of the vibration reduction part is fixedly connected with a lightning strip fixing part, and the lightning strip fixing part is in a sleeve shape; the lightning protection belt assembly comprises lightning protection belts and conductive hinges, the lightning protection belts are connected with the lightning protection belt fixing pieces, and the segments of the lightning protection belts are connected through the conductive hinges. A triple vibration reduction structure is formed through the L-shaped support, the elastic support and the vibration reduction piece, vibration transmission generated during operation of the fan is effectively isolated, and the problem of metal fatigue fracture caused by traditional rigid connection is solved.

The invention discloses an uninterruptible power lightning arrester automatic installation tool based on an insulating rod operation method, and relates to the technical field of electrical equipment installation tools. Comprising a drainage wire clamp mounting mechanism, a power supply electric control mechanism, a lifting distance adjustment assisting mechanism, a lightning arrester holding claw mechanism and a lightning arrester connecting piece. A voice control module is embedded into the power supply electric control mechanism, so that single-person remote operation is realized; the lightning arrester connecting piece can adapt to various insulators and cross arms, and can be fixed without dismantling the insulators; the lifting distance adjusting power-assisted mechanism is matched with a moving roller through an electric push rod to realize position and height adjustment; the lightning arrester holding claw mechanism can avoid umbrella skirts to stably clamp different types of lightning arresters; the drainage wire clamp installation mechanism completes installation of a drainage wire clamp and bolt tightening. The device is high in adaptability and convenient and efficient to operate, can work in a non-power-off state, guarantees stable power supply, improves the installation quality and efficiency, reduces the labor intensity and the safety risk, and effectively overcomes many defects of an existing installation tool.

The invention discloses an ancient building lightning protection system and method based on a lightning early warning device, and belongs to the technical field of lightning protection systems, and the system comprises a sensing layer, a decision layer, an execution layer and a digital twin platform. The sensing layer collects multi-mode environmental parameters through an annular atmospheric electric field monitoring array, a broadband electromagnetic pulse sensor and a meteorological sensor. The decision-making layer fuses data and outputs four levels of risk levels through the risk prediction model of the ancient building LSTM combined attention mechanism, and generates a protection instruction; and the execution layer adopts a bionic hidden lightning receiving device (hidden in a non-working state), a passive corona field lightning driving device and a multi-stage historic building SPD, and responds according to a grading strategy. The digital twin platform constructs a high-precision model, and realizes data visualization and protection strategy simulation optimization. Passive lightning protection is converted into active intelligent protection, the situation that a traditional device destroys the style and appearance of an ancient building is avoided, secondary damage caused by lightning stroke is reduced, self-learning optimization can be achieved, and the requirements for safety and cultural relic protection are met.

The invention relates to the technical field of lightning rods, in particular to a lightning rod with a monitoring and early warning function, which comprises a bracket assembly, a rotating assembly movably connected to the bracket assembly, a needle body assembly connected to the rotating assembly and a control assembly connected to the rotating assembly. The concave face is the windward side, the convex face is the leeward side through the arc-shaped driving plate, meanwhile, continuous rotating torque is formed on the upwind side by means of resistance difference and on the downwind side by means of the lift force effect, and through the arc-shaped structure, the plate can generate one-way rotating force no matter how the wind direction changes, clamping stagnation is avoided, and the wind direction can be controlled to be stable. According to the lightning rod, the driving plate can rotate to improve the stability of the rod body assembly in the rotating process, meanwhile, the airflow can be guided by the driving plate in the rotating process of the driving plate through the multiple flow guide strips, so that the rotating efficiency of the whole driving plate is improved, and the lightning rod can be guided to the state perpendicular to the wind direction by wind power in the using process.

The application discloses a lifting type independent lightning protection device, which comprises a lifting mast arranged vertically and a supporting column, an unlocking cylinder connected with each locking pin control is arranged in the lifting mast, a control box and a gas pump are arranged in the supporting column, the gas pump is connected with the lifting mast control, a lightning rod body is detachably arranged on the top of the unlocking cylinder, a guide shaft is coaxially connected between the lightning rod body and the unlocking cylinder, a piston assembly is arranged on the guide shaft, and a self-locking device is arranged on the outside of the abutting position of the mounting seat and the piston assembly. The application has the advantages of simple structure, convenient disassembly, stable connection, flexible lifting adjustment of the lightning protection device, and convenient rapid installation, maintenance and repair.

The present invention provides a wind turbine blade shell part for a wind turbine blade, the blade shell part comprising: a structural element providing structural strength to the blade shell part and comprising carbon fibres embedded in a polymer matrix; a lightning receptor exposed at an outer surface of the blade shell part and extending towards the structural element; and an electrically conductive adhesive attaching the lightning receptor to the structural element. A method for manufacturing such a blade shell part is also provided.(FIG. 8C)

The application discloses an OPGW distribution line lightning attracting protection device and a use method thereof, wherein the device comprises a composite insulator umbrella skirt, a lightning attracting rod fixed on the composite insulator umbrella skirt, a lightning guiding rod matched with the lightning attracting rod and a connecting mechanism. The connecting mechanism comprises an adjusting assembly. The adjusting assembly comprises an insulating porcelain seat fixedly connected at the bottom end of the composite insulator umbrella skirt. A U-shaped guide rail is fixedly connected to the side surface of the insulating porcelain seat. An end seat is movably connected to the inner side of the U-shaped guide rail, and clamping grooves are formed in the two sides of the inner wall of the U-shaped guide rail. Clamping edges are arranged on the two sides of the surface of the end seat. The two clamping edges are slidably connected in the same side clamping groove, and the connection between the clamping edges and the clamping groove is lockable. The lightning guiding rod is fixedly connected to the end seat. In use, the connection between the clamping plate and the clamping groove is only unlocked, and then the gap distance between the lightning guiding rod and the lightning attracting rod can be adjusted by pushing the end seat to move, so that the adjusting efficiency is better than that of continuous screwing adjustment.

The invention relates to the technical field of power transmission line lightning protection, in particular to an active and passive cooperative lightning protection system and method for a power transmission line, and aims to judge whether lightning affects the power transmission line or not, perform early warning on the power transmission line with a lightning stroke risk, and execute corresponding active lightning protection measures; according to lightning activity data of an electric field and related data of previous lightning strokes of the electric field, on the other hand, the power transmission lines are divided into different risk levels, passive lightning protection measures are taken for the different power transmission lines according to the corresponding risk levels, and the passive lightning protection effect of the power transmission lines is improved; the lightning protection effect of the power transmission line is further improved, and the actual operation lightning protection requirement is met.

The present invention provides a line gap lightning arrester installation auxiliary device, wherein the support structure of the line gap lightning arrester installation auxiliary device includes a telescopic portion so that the height of the support structure can be adjusted; a first wearing structure is used for being worn by a foot and is arranged on one end of the support structure; a height adjustment structure is arranged on the support structure, and the height adjustment structure includes a driving member, a ratchet assembly and a transmission assembly. The driving member is driven and connected to the telescopic portion through the ratchet assembly and the transmission assembly. The driving member is rotatably arranged so that when the driving member rotates in a first direction, the telescopic portion is driven to extend through the ratchet assembly to adjust the height of the support structure; wherein the driving member has an abutting end, and when at least part of the support structure is tilted in a preset direction under the drive of the foot, the abutting end abuts against the working surface to rotate the driving member in the first direction. The present invention effectively solves the problem of low installation efficiency of line-type lightning arresters in the prior art.

The invention relates to the technical field of line lightning protection, in particular to an overhead transmission line lightning arrester and an installation method.The overhead transmission line lightning arrester comprises two bases used for being installed on a cross arm, and an n-shaped plate is clamped between the two bases and fixedly arranged through bolts; a first lightning arrester and a second lightning arrester which are used for lightning protection of the power transmission line are installed on the n-shaped plate, connecting plates are installed at the tops of the first lightning arrester and the second lightning arrester, and a first fixing clamp, a second fixing clamp and a wire clamp which are used for being installed on the line are installed on the connecting plates; an overhead line is arranged among the first fixing clamp, the second fixing clamp and the wire clamp in a penetrating mode, the first lightning arrester is located on the two sides of the n-shaped plate, the second lightning arrester is located in the middle of the n-shaped plate, the first lightning arrester and the second lightning arrester are connected with on-line monitoring devices on the n-shaped plate, and the lower ends of the on-line monitoring devices are connected with discharge counters. The device has the advantages of being compact in structure, convenient to replace parts and capable of stably operating for a long time in an extreme environment.

The present invention discloses an adjustable lightning arrester bracket for wind power generation equipment, which relates to the technical field of lightning protection for wind power generation equipment, and comprises a supporting body, including a supporting tube, a plurality of supporting columns in a circumferential array, a lightning arrester assembly, an adjustment base, and a limit ring; an adjustment unit, including an adjustment member, a transmission member, a steering assembly, a grounding base, a transmission assembly, a main needle, and a plurality of groups of oblique needles. The beneficial effects of the present invention are to achieve the adjustment of the angles of the main needle and the oblique needle on the wind turbine, expand the range of protection of the lightning rod, and ensure that the direction of connection between the lightning rod and the lightning is consistent, increase the rate of conducting electricity, improve safety performance, and at the same time be able to change the outer diameter of the main needle and the oblique needle, improve the ability of local lightning protection, or expand the range of lightning protection, connect the main needle with the oblique needle and the single lightning arrester in series, thereby further reducing the risk of equipment damage to improve the lightning protection capability of the equipment.

An assembly (1) of variable-pitch blades for an unfaired aircraft turbomachine, the assembly comprising a rotor (3) movable about a radial axis (X) of the turbomachine, a stator (4) fixed about said radial axis (X), and at least one lightning arrester (5). The lightning arrester (5) comprises a pin (6), at least one face of said pin (6) being in contact by friction with the rotor (3), a screw (7) radially extending from said pin (6), and a means (8) for connecting the pin (6) and the screw (7), said means (8) comprising a spring interposed between the pin (6) and the screw (7). Figure for the abbreviation: Fig 1

The invention discloses a live-line installation tool for a lightning arrester and an installation method of the live-line installation tool, and relates to the technical field of lightning arrester installation, the live-line installation tool for the lightning arrester comprises an upper cross beam, a lifting point adjusting mechanism, a traction mechanism and a tightening mechanism, and the lifting point adjusting mechanism comprises a lead screw and a lower cross beam; the top ends of the two lead screws are movably installed at the two ends of the upper cross beam in an inserted mode. The rack is driven by the lightning arrester to ascend so as to drive the winding wheel to wind the bearing rope, the ratchet wheel is clamped with the clamping block, so that the winding wheel and the bearing rope can vertically load the lightning arrester when the traction rope is not stressed, the height of a lifting point can be adjusted again when the traction rope is not stressed, the lifting point is lifted, the stroke of the lightning arrester during lifting is increased, and the hoisting efficiency is improved. Unbalanced stress on the wires on the two sides is avoided, left-right shaking of operators is avoided, the installation efficiency and the installation effect are improved, serious shaking is avoided, and the safety of the operators is improved.

The invention relates to the technical field of lightning protection equipment, and discloses a self-energy-consumption intelligent lightning arrester which comprises a stand column, a steel pipe fixedly installed on the stand column, a trigger device fixedly installed on the outer side of the steel pipe, an installation base fixedly installed on the trigger device, and a central collection needle fixedly installed on the steel pipe located in the installation base. A pressure equalizing mechanism is arranged on the mounting seat and comprises a lower mounting ring and an upper mounting ring, and the lower mounting ring and the upper mounting ring are fixedly connected through a plurality of connecting screw rods. A plurality of excitation needles are arranged on the voltage-sharing rod, so that an electric field around the voltage-sharing rod is more concentrated, the intensity of the electric field at the needle point is stronger, the air ionization effect is better, the thunder and lightning attraction capability is stronger, the opportunity of contact with thunder and lightning pilot is increased, the shielding failure possibility is reduced, fine adjustment of electric field distribution is realized, corona discharge is reduced, more discharge channels are provided, and the speed of thunder and lightning flowing into the ground is increased; and meanwhile, discharge flashover is guided between the needle bodies, so that the grading ring body is protected.

The present invention discloses a composite lightning arrester protective cover capable of live working and can be installed live; it includes a protective cover main body and a protective cylinder for wrapping the cable of the composite lightning arrester; the protective cover main body is provided with a cavity with an opening facing downward and can be sleeved into the composite lightning arrester; the protective cylinder is horizontally fixed on the right side of the protective cover main body; a first slit is respectively provided at the top and bottom of the protective cylinder along the axial direction, and a third slit with the slit opening becoming larger from right to left is provided, and a second slit coplanar with the first slit is provided at the top of the protective cover main body; a fourth slit connected to the third slit is provided on the right side of the bottom of the protective cover main body. An insulating fixture is also provided, which includes a clamping part and a fixing part detachably connected to an insulating rod; the clamping part is provided with two semicircular clamping grooves suitable for the insertion of the protective cylinder; the clamping part is provided with a third through hole located between the two clamping grooves and suitable for the passage of the cable; a cable opening suitable for the cable to move to the third through hole is provided at the bottom side of the clamping part; the fixing part is arranged on the left side of the clamping part and is fixedly connected to the clamping part.