70results about How to "Improve lightning resistance" patented technology

A solid state power controller (SSPC) often contains electronic circuitry which could be damaged or upset by the excessive transient voltages induced by the lightning and SSPC could result in undesirable (or nuisance) trips due to lightning strikes. The present invention is intended to address the “nuisance trip” issue, by relying on the lightning indicative signals to distinguish between the transient current surge due to the lightning strike and that due to the circuit fault in the power distribution channel. The present invention utilizes either the break-down current in a transient voltage suppression (TVS) device, or a voltage signal at the output of the SSPC as the indication of lightning strike, to avoid nuisance trips.

The invention discloses a lightning protection power cable, which comprises a power transmission cable core and a coating layer for coating the cable core, wherein the coating layer comprises a shielding layer which shields the cable core, an outer tape layer which coats the shielding layer, an outer sheath which coats the outer tape layer, and a grounding layer which is arranged between the cable core and the shielding layer. In the lightning protection power cable, the grounding layer is arranged to improve the lightning protection capacity of the power cable, namely, the grounding layer conducts thunder and light entering the cable into the ground at the moment when a lightning fire occurs so as to ensure the security of the power cable and base station equipment connected with the power cable.

The invention discloses a high-conductivity composite carbon fiber and a preparation method thereof, and belongs to composite carbon fibers and a preparation method thereof. The high-conductivity composite carbon fiber provided by the invention consists of carbon fibers as well as metal coatings and graphene coatings, which are sequentially adhered on the surfaces of the carbon fibers from bottom to top; the carbon fibers are carbon fiber yarns, carbon fiber bundles, carbon fiber cloth, carbon fiber paper or carbon fiber fabrics; the metal coatings are a metal copper coating, a metal nickel coating or a metal iridium coating; and the thicknesses of the metal coatings are 50-500nm. The composite carbon fiber prepared by the invention has excellent conductivity and heat conductivity, can conduct or dissipate lightning stroke energy rapidly, and improves the thunder stroke resistant capability of the carbon fiber material.

The invention discloses a self-supporting lightning-proof power cable. The power cable comprises a power transmission cable core, a covering layer for covering the cable core and a suspension wire connected with the covering layer, wherein the covering layer comprises a shielding layer for shielding the cable core, an external tape layer for covering the shielding layer, an external sheath for covering the external tape layer and a grounding layer arranged between the cable core and the shielding layer. The lightning-proof capacity of the power cable is increased by arranging the grounding layer, namely the grounding layer instantaneously conducts the lightning entering the cable into ground to ensure the safety of the power cable and base station equipment connected with the power cable when the lightning strike occurs.

The invention discloses a mini super surface-mounted fuse protector. The mini super surface-mounted fuse protector comprises a melt, at least two cavity plates, at least two substrates, end electrodesand fillers. The melt is provided with a low-overload striking point and at least two high-interruption striking points. The high-interruption striking points are connected with the low-overload striking point in series, and are arranged on two sides of the low-overload striking point. The cavity plates are provided with cavities. The substrates are stacked on the upper side and the lower side ofeach cavity plate. The end electrodes are electrically connected with the melt, and are arranged on the substrates and / or the cavity plates. The cavities are filled with the fillers, namely powder materials in different sizes. The low-overload striking point and the high-interruption striking points are located at corresponding positions of the cavities. The invention further provides a manufacture method of the surface-mounted fuse protector. The mini super surface-mounted fuse protector has the advantages that consumer electronic circuits for civil use can be protected under various overload conditions, and hidden danger such as shell smoking, crack or explosion is avoided.

A solid state power controller (SSPC) often contains electronic circuitry which could be damaged or upset by the excessive transient voltages induced by the lightning and SSPC could result in undesirable (or nuisance) trips due to lightning strikes. The present invention is intended to address the “nuisance trip” issue, by relying on the lightning indicative signals to distinguish between the transient current surge due to the lightning strike and that due to the circuit fault in the power distribution channel. The present invention utilizes either the break-down current in a transient voltage suppression (TVS) device, or a voltage signal at the output of the SSPC as the indication of lightning strike, to avoid nuisance trips.

By means of a simple structure, lightning resistance is improved without increasing the level of fluid noise due to a lightning discharge member provided on a surface of a wind turbine blade. A wind turbine rotor blade lightning discharger, in which a diverter strip serving as a lightning discharge member protrudes from a surface of a wind turbine blade that extends in a radial direction from a rotor head supported in a freely rotatable manner, includes a noise suppressing structure that suppresses the generation of a Karman vortex, which causes noise, on the downstream side of the diverter strip with respect to an airflow that flows at the surface of the wind turbine blade during rotation of the wind turbine rotor blade.

The invention discloses a same-time-sequence multi-pulse lightning protection box. The same-time-sequence multi-pulse lightning protection box comprises a lightning protection module, a sampling circuit, a detection circuit and a display panel which are connected in sequence, wherein the sampling circuit comprises an EMC (Electro Magnetic Compatibility) strong electromagnetism restraining circuit, a signal acquisition circuit and a strong electromagnetism isolating restraining circuit. When a low-voltage power supply circuit is subjected to lightning electromagnetic pulse impact, a lightning overvoltage signal is generated on the low-voltage power supply circuit and is applied to the lightning protection module, the lightning protection module is used for transmitting one path of the lightning overvoltage signal to the EMC strong electromagnetism restraining circuit, and the other path of the lightning overvoltage signal is connected with a PE (Provider Edge) end, so that lightning is conducted into the ground; the EMC strong electromagnetism restraining circuit is used for limiting the rising gradient and amplitude of the generated lightning overvoltage signal and transmitting the processed signal to the signal acquisition circuit; the signal acquisition circuit is used for acquiring a signal and transmitting the acquired signal to the strong electromagnetism isolating restraining circuit; and the strong electromagnetism isolating restraining circuit is used for isolating the signal, transmitting the processed signal to the detection circuit, and accurately transmitting the processed signal to the display circuit panel, so that man-machine information exchange is completed.

This invention provides one device and method to realize E1 and T1 interface backup, which can realize same function of the interface signal board and backup board, wherein, the main interface board and backup one front insert board adopts Y type of cable for wire connection with outer E1 or T1 composed of relay; when the main interface board or backup is false or damaged, it selects proper main interface signal board or backup interface single board through relay to realize circuit connection.

The present invention relates to the technical field of electrolytes, in particular to a high-sparking and anti-lightning electrolyte for an aluminum electrolytic capacitor and a preparation method therefor. The electrolyte comprises the following raw materials in parts by weight: 1.5-2.5 parts of ammonium dodecanedioate, 0.8-1.2 parts of ammonium sebacate, 5-9 parts of sorbitol, 4-6 parts of boracic acid, 4-6 parts of diethylene glycol monobutyl ether, 1-2 parts of polyvinyl alcohol, 0.4-0.6 part of p-nitrobenzyl alcohol, 0.1-0.3 part of ammonium hypophosphite, 6-10 parts of ethylene glycol nano silica sol and 60-80 parts of glycol. The electrolyte is prepared by means of interaction among the raw materials and by strictly controlling a weight proportion of the raw materials; the sparking voltage of the prepared electrolyte can reach 590 V and the conductivity rate of the prepared electrolyte can reach 0.5 ms / cm; and the electrolyte has good electrochemical properties, has the advantages of high sparking voltage, lightning resistance and the like, and can be applied to manufacturing of the aluminum electrolytic capacitors.

The invention discloses a fan blade lightning stroke current simulation method and system based on multi-physics field coupling, and belongs to the field of wind power generation equipment protection, and the method comprises the steps: building a three-dimensional geometric model of a fan blade; defining a multi-physical field environment including an electromagnetic field, a thermal field and a stress field; setting lightning stroke points on the three-dimensional geometric model according to lightning parameters; calculating electromagnetic distribution, temperature distribution and stress distribution in the blade in the lightning stroke process along the lightning propagation channel by using the electromagnetic field, the thermal field and the stress field based on the lightning stroke point, the lightning stroke basic information and the lightning attenuation rate; and constructing a lightning stroke current simulation result according to the electromagnetic distribution, the temperature distribution and the stress distribution, and performing visual display. The technical problem that the blade lightning protection design is insufficient due to the fact that the influence of lightning stroke on the multi-physical field interaction of the fan blade cannot be comprehensively and accurately simulated and analyzed in the prior art is solved.

The invention discloses a thunder-proof power driving LED lamp. The thunder-proof linear power driving LED lamp comprises a thunder prevention module, a rectifying module and a linear power driving light emitting diode illumination module, wherein the thunder prevention module is used for limiting lightning transient surge current which passes through the LED lamp when a lightning stroke is occurred to the LED lamp, the rectifying module is used for rectifying alternating current and outputting pulsatile direct current, the linear power driving light emitting diode illumination module comprises N constant-current optical units which are used for regulating the pulsatile direct current output from the rectifying module into constant current source, responding to the lightning transient surge current and averaging the lightning transient surge current simultaneously. The ACLEDs module in the thunder-proof linear power driving LED lamp only comprises the constant-current optical modules rather than bridge rectifiers; when the lightning stroke is occurred to the lamp in the door or out of door, the response speed of each ACLEDs module to the lightning transient surge current is approximately consistent so that the lightning transient surge current is divided uniformly, and the weak thunder-proof link is eliminated. When the linear power driving LED lamp is used in the door, the thunder prevention module can be omitted so as to save cost.

The invention relates to a lightning stroke-resistant optical fibre composite overhead ground wire, which comprises aluminium-covered steel wires and an optical unit by taking a stainless steel tube as a sleeve, wherein the optical unit comprises an optical fibre; the optical fibre is in the stainless steel tube; the aluminium-covered steel wires and the optical unit form a layered stranded structure; the aluminium-covered steel wires comprise first aluminium-covered steel wires, second aluminium-covered steel wires and third aluminium-covered steel wires; the layered stranded structure comprises a central layer, a first layer and a second layer; the first aluminium-covered steel wires are in the central line; the first layer is composed of the second aluminium-covered steel wires and the optical unit; and the second layer has eleven third aluminium-covered steel wires. The lightning stroke-resistant optical fibre composite overhead ground wire disclosed by the invention is mainly used for constructing an optical fibre communication network of a power system and has the functions, such as lightning protection, flow division, optical fibre communication and the like, at the same time; furthermore, the lightning stroke-resistant optical fibre composite overhead ground wire has good lightning stroke-resistant performance and can be applied to areas with high thunderstorm.

The invention discloses a single chip microcomputer-based lightening protection online detection integrated box, which comprises a box body, a box cover, a first PCB and a second PCB, wherein the first PCB is provided with a power input terminal, a 10-mode power supply protection circuit, an RC anti-harmonic interference circuit and a single chip microcomputer power supply circuit; the second PCB is provided with a single chip microcomputer, an OLCD screen display circuit connected to the single chip microcomputer, a power supply indicating circuit, a data collecting and processing circuit, an RS485 data transceiver circuit, an external lightening protection module degradation detection circuit, a query button and a sound-light alarm circuit; and the power supply input terminal is used for being connected to a three-phase power supply of a low-voltage power system. By the single chip microcomputer-based lightening protection online detection integrated box, the lightning resistance and the anti-jamming capability of computer room equipment of the low-voltage power system are improved; the safe operation reliability of the equipment is improved; the damage rate of the computer room equipment of the low-voltage power system is reduced; the operation and maintenance cost of a building user is reduced; and good social benefits and economic benefits are generated.

A planar Schottky barrier diode comprises an N-type heavily-doped silicon substrate, an N-type light-doped epitaxial layer, a P-type heavily-doped loop region, a thin oxide layer, a field oxide layer, a Schottky barrier layer and multiple layers of metal and is characterized in that a P-type light-doped loop region is arranged in the N-type light-doped epitaxial layer outside the P-type heavily-doped loop region, the thin oxide layer is arranged on the P-type heavily-doped loop region and the P-type light-doped loop region, the field oxide layer is arranged on a part of the P-type light-doped loop region and on a part of the N-type light-doped epitaxial layer outside the P-type light-doped loop region, and the Schottky barrier layer is formed on a part of the P-type heavily-doped loop region and on a part of the N-type light-doped epitaxial layer. With the diode disclosed by the invention, the pressure resistant efficiency of the P-type heavily-doped loop region can be effectively improved, the surface field of a Schottkey barrier region can be further enhanced by reducing the junction depth of the P-type heavily-doped loop region, so that the lightning resistance ability of the planar Schottkey barrier is improved, the positive conducted voltage drop can be reduced, and the positive surge capability is improved.

The invention discloses a connector, which comprises an outer shell, an inner shell, a cable and an electronic module, wherein the front end of the outer shell is suitable for being buckled to a connecting seat; the inner shell is accommodated in the outer shell; the cable extends into the inner shell; and the electronic module is electrically connected with conductor cores of the cable. The cable includes an outer shielding layer which wraps the conductor cores and is electrically isolated from the conductor cores, and the outer shielding layer is suitable for being electrically connected to the connecting seat. The cable further includes an inner shielding layer which is located between the conductor cores and the outer shielding layer and is electrically isolated from the conductor cores and the outer shielding layer, and the inner shielding layer is suitable for being electrically connected to a metal housing of the electronic module. In the invention, the inner shielding layer of the cable can be grounded through the metal housing of the electronic module, and the outer shielding layer of the cable can be grounded through the connecting seat, thereby effectively improving the lightning resistance of the whole connector, and improving the outdoor use safety performance of the connector.

The invention discloses a control system of a remote-control ice-melting short-circuit switch of a wind power current collection line, relates to the technical field of disaster prevention and reduction of a power system, and designs an effective control system on the basis of a mechanical structure of the ice-melting short-circuit switch to realize remote signaling, remote measurement and remote control functions and video monitoring of the state of a high-voltage isolation switch. Normal and stable operation of the ice melting equipment is ensured, and the ice melting efficiency of the wind power plant current collection line is practically improved; the control system is high in reliability, high in intelligent degree, capable of achieving quick and convenient ice melting of the current collection line and preventing switch live-line electric misoperation and live-line manual misoperation, extremely high in safety and suitable for large-area application and popularization.

The invention discloses a semiconductor discharge tube, a manufacturing method thereof and an overvoltage protection device. The semiconductor discharge tube comprises two doping structures and a substrate with a first conduction type, the first side of the substrate and the second side of the substrate are respectively provided with a doping structure; wherein the first side of the substrate is opposite to the second side of the substrate; the doped structure comprises a first doped region with a second conductive type, a second doped region with the second conductive type and at least one third doped region with the first conductive type; the second doped region is located in the first doped region, and the concentration of doped ions in the second doped region is far greater than the concentration of doped ions in the first doped region; the third doped region is located in the second doped region. According to the semiconductor discharge tube, the manufacturing method thereof and the overvoltage protection device, the voltage resistance of the semiconductor discharge tube can be improved, and the voltage locking range of the semiconductor discharge tube can be expanded.

The invention discloses an aluminum cladding steel wire, which comprises a steel core and the aluminum cladding coated on its periphery. The external contour on the cross section of the aluminum cladding is provided with an upper and a lower sideline in concentric circles, as well as the left sideline with flanged edge and the right sideline with emargination. Taking the center of the said concentric circles as the center, the left sideline turns a central angle of alpha to table its flanged edge with the emargination of the right sideline. Another aluminum cladding steel wire can also be adopted, which comprises a steel core and the aluminum cladding coated on its periphery. The external contour on the cross section of the aluminum cladding is provided with an upper and a lower sideline in concentric circles, as well as the left and right sidelines with emargination or the left and right sidelines with flanged edge. The left and right sidelines with emargination or the left and right sidelines with flanged edge are all arc lines or break lines, which are symmetrical by the joint line connecting the midpoints of the upper and lower sidelines. The neighboring two units of the invention are matched by their concave and convex. After they concentrically intertwist with each other, the interstice between each two neighboring aluminum cladding steel wires is small with high compactedness and has long service life avoiding corrosion cause by hydrops.

The invention discloses a high-altitude collector ring which comprises an inner ring, an outer ring, a power ring and a lightning discharge ring. The inner ring is axially and radially positioned through a deep groove ball bearing and via the outer ring, the inner ring is in sliding connection with the outer ring through a thrust cylindrical roller bearing, and an optical fiber rotating joint is arranged at the top of the inner ring. The middle part of the optical fiber rotary joint is connected with a middle end cover through a bolt, the bottom of the optical fiber rotary joint is rotationally connected with a middle baffle plate in a pulling and inserting manner, and a power ring electric brush welding wire penetrates through the middle end cover and is connected to a device base and thephotoelectric connector. According to the invention, the size of a product is reduced, the weight of the product is reduced, the maintainability of the product is realized, the lightning stroke resistance of the product is improved, the normal operation of the product after lightning stroke is ensured, the service life of the product is prolonged, and the working intensity of the product in a severe environment is increased.

The invention relates to the technical field of LED power supply driving, a wire-to-wire lightning protection circuit with low clamping voltage is disclosed. The circuit is provided with a first varistor, a second varistor, a common-mode inductor and a discharge tube, the first varistor being connected in series with the discharge tube between a fire line and a neutral line or between a fire lineand a fire line, and between a first homonymous terminal and a second homonymous terminal of the common-mode inductor, and the second varistor being connected between a first anonymous terminal and asecond anonymous terminal of the common-mode inductor, and the second varistor being connected between the first anonymous terminal and the second anonymous terminal of the common-mode inductor. The invention has the advantages that: When transient inrush currents occur, at this time, that clamp voltage after the conduction of both ends of the serie combined first varistor + discharge tube is substantially lower than the clamp voltage after the conduction of the second varistor. The clamping voltage of the present application is lower than a design in which a varistor is provided at the frontend of the common-mode inductor, which can suppress transient surge more effectively, improve lightning protection capability of the power supply, and achieve the purpose of more effectively protecting the power supply and the lamp board.

The invention relates to the technical field of aluminum electrolytic capacitor manufacturing, in particular to an anti-lightning aluminum electrolytic capacitor and a manufacturing method thereof.The anti-lightning aluminum electrolytic capacitor comprises an anode foil, a cathode foil, electrolytic paper, electrolyte, a rubber plug, a guide pin and an aluminum shell, the guide pin is riveted to the surfaces of the anode foil and the cathode foil, and the anode foil and the cathode foil are isolated through the electrolytic paper; and winding to form a capacitor core package, infiltrating the core package by the electrolyte, filling the core package into an aluminum shell, sealing the aluminum shell by a rubber plug to form an aluminum electrolytic capacitor, and aging the capacitor to obtain a finished product. According to the anti-lightning aluminum electrolytic capacitor and the manufacturing method thereof provided by the invention, the high-conductivity covering film and the optimized positive foil structure are adopted, so that the anti-lightning aluminum electrolytic capacitor has relatively high compression strength and anti-lightning capability, stable performance can be kept when the anti-lightning aluminum electrolytic capacitor is subjected to strong current impact such as lightning stroke, and the reliability and the safety of electronic equipment are improved.

The invention provides an airfield runway foreign object recognition image processing device and method. The device comprises a high-definition webcam, an FPGA connected with the high-definition webcam and a console connected with the FPGA. The position information of a foreign object in an airfield runway is acquired through a radar, and according to the position information of the foreign object, the optical axis of the high-definition webcam arranged outside the airfield runway turns to the area of the foreign object; the high-definition webcam carries out video acquisition on the area of the foreign object, a processing module calculates the gray mean value of the received current frame of image, and according to the gray mean value, whether a laser lighting unit needs to be turned onis judged; besides, according to the position information of the foreign object, the area of the foreign object on the image is marked; and the image is restored through an atmospheric turbulence image restoration algorithm. Thus, clear restoration of degraded images under moderate and weak atmospheric turbulences can be realized, and the environmental adaptability of the airport runway foreign object detection system can be improved.

The invention relates to a switching power supply capable of resisting 20 KV lightning strokes. The switching power supply mainly comprises a lightning resistant surge circuit and a main circuit of the switching power supply, wherein the lightning resistant surge circuit comprises a voltage dependent resistor VR1, a thermistor NTC, a fuse F1, a common mode filtering noise inductor L1 which are connected in series sequentially to form a loop; the front end of the inductor L1 is connected in parallel with the series circuit of resistors (R23 and R24), and is connected in parallel with the a capacitor CX; the rear end of the inductor L1 is connected in parallel with small-dimension voltage dependent resistor VR2; resistors (R26 and R27) are connected in parallel with two ends of the inductor L1; the rear end of the lightning resistant surge circuit is connected with a rectifying module of the main circuit; the transformer unit of the main circuit is used for reducing leakage current on between the primary side and the secondary side of the power supply according to an internal shielding method and an external shield method. The switching power supply can resist the 20 KV lightning strokes, and the lightning resistant surge circuit can effectively protect the power supply without impacting stable output of the power supply.

The invention discloses a solar railway signal lamp, which comprises a thin-film solar panel, a solar storage battery, a solar controller, a light-emitting diode (LED) light source, a lamp box, a power supply, a lamp shade and a signal lamp circuit board, wherein the thin-film solar panel, the solar controller and the solar storage battery form a solar power supply system; the LED light source is arranged on the signal lamp circuit board; the storage battery is connected with the signal lamp circuit board; a light outlet of the LED light source is provided with an optical lens; a lightning protection device is arranged in the lamp box; the solar storage battery, the LED light source and the signal lamp circuit board are arranged in the lightning protection device; the lightning protection device adopts a porcelain foreign body, so the lightning stoke resistance and impact resistance of the lightning protection device can be enhanced; the LED light source and the signal lamp circuit board are bonded by heat conducting silica gel; and the rear side of the lamp box is provided with heat dissipating air vents, so the heat of the signal lamp can be dissipated timely, and the service life of the signal lamp is prolonged.

Comparing with prior art, the invention separates analog part of El / Tl interface from its digital part. Thus, digital part and active circuit are integrated on front plug-in board, and analog part and passive circuit are integrated on back plug-in board. Moreover, the invention supports backup for El / Tl interface. Once main front plug-in board of interface is in failure, standby front plug-in board is put into operation automatically so as to enhance reliability of interface and raise stability of system. Usually, back plug-in board is not easy to be damaged so that bound cables will not be influenced. The invention possesses advantages of raised performance for anti lightning strike, preventing event of system down.

The invention relates to the technical field of signal transmission, in particular to a communication signal transmission method and device, electronic equipment and a computer readable storage medium. The method comprises the following steps: acquiring a communication signal in a communication system; performing gain processing on the communication signal; removing an interference signal in the communication signal subjected to the gain processing; and transmitting the communication signal of which the interference signal is removed to a management system. According to the technical scheme provided by the invention, signal transmission is more stable and reliable, the stability of power line carrier communication is improved, and the signal transmission quality is further improved.

A same-time-sequence multi-pulse lightning protection box comprises a lightning protection module, a sampling circuit, a detection circuit, and a display panel connected in sequence. The sampling circuit comprises an EMC strong electromagnetism suppression circuit, a signal acquisition circuit, and a strong electromagnetism isolation and suppression circuit. When a low-voltage power supply circuit is impacted by a lightning electromagnetic pulse, a lightning overvoltage signal is generated on the low-voltage power supply circuit and is applied to the lightning protection module. The lightning protection module transmits one path of the lightning overvoltage signal to the EMC strong electromagnetism suppression circuit, and another path of the lightning overvoltage signal is connected to a PE end, so that lightning is conducted into the ground. The EMC strong electromagnetism suppression circuit limits the rising gradient and amplitude of the generated lightning overvoltage signal and transmits the processed signal to the signal acquisition circuit. The signal acquisition circuit acquires the signal and transmits the acquired signal to the strong electromagnetism isolation and suppression circuit. The strong electromagnetism isolation and suppression circuit isolates the signal, and transmits the processed signal to the detection circuit and the display circuit panel, so that man-machine information exchange is implemented.

The utility model discloses an ultra-strong lightning stroke resistant aluminum electrolytic capacitor, relates to the technical field of aluminum electrolytic capacitors, and aims to solve the problems that the lightning stroke resistant effect of an existing aluminum electrolytic capacitor is improved by generally adopting high-density electrolytic paper, although the lightning stroke resistant effect is remarkable, the electrolytic paper is physically damaged after being subjected to voltage for many times, and the service life of the aluminum electrolytic capacitor is prolonged. The conductive performance and the insulating performance of the capacitor are reduced, and the service life of the capacitor is influenced. Comprising an aluminum shell, an element is arranged in the aluminum shell, and a rubber sealing head is installed at the upper end of the element; the element is formed by winding isolation layers, a positive electrode aluminum foil and a negative electrode aluminum foil, the positive electrode aluminum foil is arranged on the outer side of the negative electrode aluminum foil, the two isolation layers are arranged on the outer wall of the positive electrode aluminum foil and the outer wall of the negative electrode aluminum foil respectively, a positive electrode guide pin is installed at one end of the positive electrode aluminum foil, and a negative electrode guide pin is installed at the other end of the negative electrode aluminum foil. And a negative electrode guide pin is mounted at one end of the negative electrode aluminum foil.

The present invention relates to the technical field of grounding protection devices for power grids, and discloses a grounding protection device for smart grids, including a telescopic bracket, two limit assemblies and a conductive bar, wherein the telescopic bracket has two telescopic ends that can move closer to or farther from each other; two limit assemblies are respectively arranged at the two telescopic ends, and the limit assembly includes two limit brackets, which are respectively arranged on both sides of the telescopic bracket and can be rotatably connected to the telescopic bracket. When the limit bracket is rotated to be perpendicular to the telescopic bracket, a limit structure is formed between the limit bracket and the telescopic bracket; the conductive bar is detachably connected to the telescopic bracket; wherein the telescopic bracket, the limit bracket and the conductive bar are all conductive and electrically connected to each other. The telescopic bracket and the limit bracket can be unfolded and folded, and there is no need to fix each component by welding. The telescopic bracket and the limit bracket extending in different directions increase the length of the grounding, which can effectively reduce the grounding resistance.