143results about "Connection to earth" patented technology

An anchor for components of a lightning protection system may rely on a bonding agent, such as an adhesive, needing time for curing, drying, or otherwise setting (increasing in adhesion, strength, mechanical stability, or any combination thereof) by remaining in place while setting. The anchor may be suspended by a lip extending horizontally past an edge (plane of intersection of two planar surfaces) where a base plate is adhered to a vertical surface and the lip rests, registers in translation, and squares in rotation against a horizontal surface sharing an edge or fold (corner, bend) with the vertical surface. Once set sufficiently, the adhesive supports loads in shear (along plane of adhesion) and tension (perpendicular to plane of adhesion) imposed by brackets holding a cable, point, or both at each base plate.

The invention relates to the technical field of lightning arresters, in particular to a lightning arrester protection device which comprises a composite post insulator, two lightning arresters symmetrically arranged on an upper support and electrically connected with a cable through the upper support, and the two ends of the composite post insulator are provided with a lower support and an upper support respectively. The lower support is provided with a monitoring assembly electrically connected with the lightning arresters and used for monitoring leakage current of the lightning arresters, and the lower support is provided with a switching assembly connected with the monitoring assembly. When the leakage current is abnormal, the switching assembly can timely isolate the faulty lightning arrester and put the other lightning arrester into use, power supply reliability and system safety are guaranteed, fault expansion is avoided, the monitoring assembly monitors the leakage current in real time, early warning is achieved, accurate switching is achieved, the misoperation risk is reduced, fault positioning is clear, and the service life of the lightning arrester is prolonged.

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 relates to the field of overvoltage protectors, and discloses a line overvoltage protector with a disconnecting device, which comprises a mounting rack, the mounting rack is arranged below a high-voltage line, the top surface of the mounting rack is in threaded connection with a protector body, and the top surface of the mounting rack is in threaded connection with a lightning arrester. A mounting block is fixed to the bottom face of the mounting frame, a containing hole is formed in the bottom face of the mounting block and corresponds to the output end of the lightning arrester, an electromagnet is fixed to the top face of the inner wall of the containing hole and electrically connected with the lightning arrester, and a disconnector is arranged on the inner wall of the containing hole in a clamped mode. And an iron ring is fixed at the top end of the disconnector. According to the invention, through cooperation of the electromagnet and the electric push rod, the disconnector can rapidly and completely disconnect a circuit during action, the protector body is prevented from continuously absorbing energy after action, the protector body is prevented from being damaged, and meanwhile, the safety of protected equipment is also ensured.

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.

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.

The invention relates to a construction method for a grounding down lead system of a new energy storage power station, which is based on the construction of a main grounding grid and is used for reasonably connecting a lightning rod, a framework, a lightning arrester bracket, a main transformer, a tubular bus, a GIS (Gas Insulated Switchgear) and a brim voltage-sharing belt in the energy storage power station with the main grounding grid so as to exert the function of protecting related electrical equipment in the energy storage power station. Comprising the following steps that S1, a lightning rod, a framework, a lightning arrester support, a main transformer, a tubular bus, a GIS and a brim voltage-sharing belt are connected to a main grounding grid; s2, providing centralized grounding devices, and respectively arranging the centralized grounding devices at positions adjacent to a lightning rod, a main transformer and a tubular bus; on the basis that related electrical equipment of the energy storage power station is connected to the main grounding grid, the centralized grounding device is arranged for the lightning rod, the main transformer and the tubular bus, so that the current dispersing area is increased, the grounding efficiency of a grounding down lead system of the energy storage power station is improved, the potential difference among multiple equipment of the energy storage power station is reduced, and point position balance of the whole station is ensured; and safe operation of electrical equipment is ensured.

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.

An electric vehicle charger according to an embodiment of the present invention comprises an electric vehicle charging controller comprising an inlet comprising: an earthing pin coupled to a coupler and configured to connect a first earthing line connected to a first earthing power source in an electric vehicle power supply device and a second earthing line connected to a second earthing power source in an electric vehicle; a first signal pin coupled to the coupler and configured to connect a first signal line in the electric vehicle power supply device and a first signal line in the electric vehicle; and a second signal pin coupled to the coupler and configured to connect a second signal line in the electric vehicle power supply device and a second signal line in the electric vehicle, and a sensing unit connected to the electric vehicle power supply device through a third signal line and a fourth signal line so as to receive a third signal and a fourth signal. The inlet comprises a signal unit disposed between the second signal line and the third signal line, and configured to generate a second signal and then transmit same to the electric vehicle charging controller. The sensing unit comprises: a first processing unit electrically connected to the electric vehicle power supply device through the third signal line and the fourth signal line, and configured to receive the third signal and the fourth signal from the electric vehicle power supply device; a second processing unit for receiving the third signal and the fourth signal that a first sensing unit has received, and then transmitting same to a control unit; and an insulation unit for electrically isolating the first processing unit and the second processing unit from each other.

A terminal (14) for electrically connecting conductors (20) to an equipotential bonding bar (12) is described, comprising a connection section (42) for mechanical connection to the equipotential bonding bar (12) and a plurality of connections (18) for conductors (20). The terminal (14) has a one-piece spring unit (26) which has a base (28) and a plurality of spring arms (30) for resiliently clamping the conductors (20). At least two spring arms (30) of the plurality of spring arms (30) are provided on a first side (32) of the base (28), and at least two spring arms (30) of the plurality of spring arms (30) are provided on a second side (34) of the base (28), which is opposite the first side (32). Furthermore, an assembly (10) and a method for producing a spring unit (26) for a terminal (14) are described.

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.

A lightning protection device of a tethered balloon communication system, comprising: a lightning protection net, a shielding layer, a protection circuit; the lightning protection net wraps the tethered balloon; the shielding layer is installed outside the communication module and the communication line of the tethered balloon and is connected with the lightning protection net; the protection circuit is connected inside the communication module and is used for protecting common mode and differential mode interference caused by lightning; the lightning protection net arranged outside the tethered balloon, the shielding layer and the protection circuit arranged inside the communication module are designed according to the characteristics of the communication system in the tethered balloon, the communication module and the communication line are treated in all directions, the damage caused by lightning to the communication module of the tethered balloon and the radiation and conduction interference in the lightning process are effectively reduced, the normal work of the communication module in the lightning process is ensured, and the accuracy and reliability of data transmission are ensured.

A live-line working, fully insulated, separable gapless surge arrester device comprises: a piercing, detachable insulated clamp, a high-voltage lead, a lightweight insulating cavity, an upper contact, an upper insulated waterproof piston ring, the arrester body, a lower insulated waterproof piston ring, an insulating sheath, a contact ring, a contact piece fixing ring, a contact piece, an elastic tension spring, a metal bracket, an insulating bracket, a disconnector connection bracket, a disconnector, a disconnector itself, and a lead wire connection terminal. It is mainly used for overvoltage protection of power distribution lines. The insulated operating rod allows for live-line installation and removal of the arrester body and disconnector, improving installation and maintenance efficiency. The disconnector temporarily isolates power frequency current and clearly indicates the fault point, reducing losses caused by power outages due to grounding short circuits. The disconnector connection bracket facilitates live-line separation and replacement of the disconnector. The device is fully insulated, improving the insulation process of the line. The piercing, detachable insulated clamp facilitates live-line installation and removal, eliminating the need to strip the insulation from the conductor, thus improving installation efficiency and line insulation.

The invention provides a 10kV power distribution network overhead insulated wire breakage prevention device. The 10kV power distribution network overhead insulated wire breakage prevention device comprises a lightning protection filter, an insulated wire guide binding wire and a 10kV insulated wire. The insulated wire guides the binding wire to be wound on the surface of an insulating layer of the 10kV insulated wire, and one end of the insulated wire is connected with the upper end of the lightning protection filter; and the lower end of the lightning protection filter is connected with a grounding grid through a ceramic resistor. According to the invention, the binding wire is guided to wind the surface of the insulating layer of the 10 kV overhead cable through the overhead insulated wire, so that the high-frequency component of lightning current is guided to be discharged from the filter preferentially, and the high-frequency component of the lightning current is absorbed through the bipolar plate effect in the filter and the high-frequency absorption effect of the barium titanate phase-change material. The high-current arc striking effect on the insulated wire under lightning stroke can be effectively improved, the wave head voltage of steep waves of lightning current is rapidly reduced, and lightning stroke trip-out faults caused by disconnection of the insulated wire of a distribution line and lightning stroke flashover under lightning stroke are reduced.

An earthing connection device for an earthing system of an offshore structure includes at least one earthing connector configured to be inserted in an underwater ground in an installed state of the earthing connection device. At least one electrical connector is electrically connected to the at least one earthing connector. The least one electrical connector is configured to connect the electrical connector with at least one armoring wire of at least one armoring layer of the submarine cable.

The present invention relates to a lightning protection device for a wind turbine generator set based on lightning current dissipation, comprising a wind turbine blade, a hub, and an output shaft disposed at the rear end of the hub. A main pin is disposed at the end of the wind turbine blade, the conductive end of the main pin being connected to a blade lightning protection grounding wire, one branch end of the blade lightning protection grounding wire being connected to a grounding downlead disposed in the hub, and the other branch end of the blade lightning protection grounding wire being connected to an energy storage assembly. A drive assembly is disposed within the wind turbine blade for universal rotation of the main pin using wind energy, the drive assembly comprising a drive sleeve, a first metal clamping block disposed at the end of the drive sleeve, a second metal clamping block disposed within the first metal clamping block, and a tapered block disposed at the end of the second metal clamping block. This lightning protection device for a wind turbine generator set based on lightning current dissipation can effectively discharge lightning current to the ground, reducing the thermal effect of lightning current. Furthermore, it facilitates receiving lightning from multiple directions, has a wide lightning absorption range, and exhibits excellent anti-interference performance.

The invention provides a shock insulation support and thunder and lightning protection integrated structure, and relates to the technical field of constructional engineering, the shock insulation support and thunder and lightning protection integrated structure comprises a lower connecting steel plate, the upper surface of the lower connecting steel plate is fixedly connected with a shock absorption laminated layer, the center of the shock absorption laminated layer is provided with a trigger mechanism, and the upper surface of the shock absorption laminated layer is fixedly connected with a lower supporting plate; a connecting mechanism is arranged at the edge of the upper surface of the lower supporting plate, a rotating shaft is rotationally connected to the center of the lower supporting plate, an inner rotating plate is fixedly connected to the middle of the outer surface of the rotating shaft, the vibration amplitude is accurately recognized through a trigger mechanism, the connecting mechanism is linked to unlock a clamping assembly, and the relative position of the upper supporting plate and the lower supporting plate can be flexibly adjusted; and the inner rotating plate is driven to turn to the stress side and is matched with the supporting mechanism to form transverse and longitudinal double reinforced supporting, and the effects that the building transverse movement amount can be effectively limited, support dislocation is avoided, and the structural safety under high-intensity earthquakes is remarkably improved are achieved.

The invention discloses a lightning protection type outdoor switch cabinet, relates to the field of switch cabinets, and solves the problem that a lightning rod of an existing switch cabinet is difficult to overhaul, the lightning protection type outdoor switch cabinet comprises a switch cabinet body and a mounting plate mounted on the outer side of the switch cabinet body, a mounting box is mounted on the inner side of the mounting plate, and the lightning rod is arranged on the inner side of the mounting box; the top of the switch cabinet body and the top of the mounting box are provided with mobile through holes, the bottom of the lightning rod is provided with a lead, and one end of the lead is provided with a grounding grid. The positioning mechanism is used for moving and storing the lightning rod, and the positioning mechanism is mounted on the inner side of the mounting box; according to the invention, the lightning rod can be collected into the switch cabinet body through the position adjusting mechanism, thereby facilitating the maintenance of a worker without climbing, enabling the lightning rod to move upwards to the top of the switch cabinet body through the moving through holes in the installation box and the switch cabinet body, and guaranteeing the protection of the lightning rod on the switch cabinet body. Therefore, the effect of improving the maintenance safety of the lightning rod is achieved.

A blade (200) for a wind turbine (10) comprises a lightning protection system and a non-conductive outer surface (201). The lightning protection system comprises an internal downlead (31) for conducting lightning current to the base portion (21) of the blade (200). The lightning protection system further comprises one or more exposed lightning receptors (400) located on the suction side (26) or the pressure side (25) of the blade (200) at the spanwise location of the blade (200), extending through the outer surface (201) of the blade (200) and electrically connected to the inner downlead (31). For one or more lightning receptors (400), the lightning receptors (400) are arranged on one or more points (X) on the other side of the suction side (26) or the pressure side (25) of the blade (200) at spanwise positions corresponding to the lightning receptors (400), and the lightning receptors (400) are arranged on the other side of the suction side (26) or the pressure side (25) of the blade (200). The total breakdown voltage along any path of lightning from any of the one or more points (X) to the lightning receptor (400) via the interior of the blade (200) is greater than the total breakdown voltage along an indirect path from that point (X) to the lightning receptor (400) around the exterior surface (201) of the blade (400).

The invention discloses a lightning protection metal roof structure which comprises a roof purline, a roof waterproof roll located on the roof purline and a metal roof board located on the roof waterproof roll. The metal roof panel is fixed on the roof purline through a fixing seat of a roof panel rib, and a lightning conductor structure is connected between the fixing seat and the roof purline; the lightning conductor structure comprises an upper-section lightning conductor located on a roof waterproof coiled material, a lower-section lightning conductor located below the roof waterproof coiled material and a conversion piece arranged on the roof waterproof coiled material in a penetrating mode, and the upper-section lightning conductor and the lower-section lightning conductor are connected through the conversion piece, so that punching on the upper surface of a roof board is avoided; lossless installation is guaranteed, damage to a waterproof layer of the roof panel is effectively avoided, and therefore the requirement for lightning protection and grounding of the metal roof is met, and meanwhile the waterproof requirement of the metal roof structure is met.

The present invention provides a lightning arrester installation device, specifically: including: a fixing mechanism, a connecting mechanism arranged on the fixing mechanism, wherein the fixing mechanism includes a main seat, and an impactor arranged on the main seat; the connecting mechanism includes a bracket assembly, and a guide rail assembly arranged on the fixing mechanism; the bracket assembly can ensure the stability of the upper and lower clamping plates during the installation process; the clamping assembly can effectively clamp lightning arresters of multiple sizes through three-point positioning; the guide rail assembly can ensure that the bracket assembly remains in a centered position during the installation process and does not deviate to the sides, thereby ensuring the installation quality of the lightning arrester; the present invention has a smart structure, is easy to use, reduces the labor burden of operators, and greatly improves work efficiency.

The present invention discloses an integrated liftable meteorological tower platform, comprising: a platform, the platform comprising a base plate, a sleeve provided on the base plate, a first telescopic cylinder and a plurality of columns fixed to the bottom wall inside the sleeve, a second slide plate and a first slide plate interposed between the plurality of columns, a top wall of the sleeve circumferentially provided with an annular groove, an annular slide rail embedded in the annular groove, a slide end of the annular slide rail extending out of the annular groove and connected to a third telescopic cylinder, an output end of the third telescopic cylinder fixedly connected to a first curved plate, a surface of the first curved plate fixedly connected to a plurality of protrusions; a wind rod comprising a rod body, the bottom surface of the rod body fixedly connected to the top surface of the second slide plate, the bottom surface of the rod body vertically provided with a plurality of slide grooves, the side wall of the rod body provided with a plurality of limit grooves, a cavity within the rod body, and an air pump installed in the cavity. The present invention eliminates the need for manual labor when adjusting the height of the wind rod, reduces safety hazards, improves work efficiency, and simultaneously improves the stability of the wind rod installation.

Power line conductors are normally shielded from direct lightning strikes by appropriately placed overhead ground wires. However, even when such overhead ground wires work as intended and intercept a strike, for a short period of time, typically a few microseconds, the shield wire is exposed to an impulse type potential rise. This could be sufficient to cause flashover of one or more line insulator strings. This is called backflash. The present invention solves this problem by providing a power transmission tower structure with an embedded ground conductor positioned in order to optimize the coupling factors to all conductors and reduce stress on all insulator strings through increased electromagnetic coupling. Use of a streamer-inhibited conductor avoids adverse effects such as radio interference and audible noise due to induced charges and improves electromagnetic coupling as a result of the reduced surge impedance of the conductor.

A lightning protection conductor clamp (10) for fixing a lightning protection or earthing conductor (12) to a reinforcing material (14) is shown. The lightning protection conductor clamp (10) comprises two clamping devices (16), each having a base (18) via which the two clamping devices (16) are connected to each other in a connection plane (E). Furthermore, each clamping device (16) has a receptacle (20) formed by a retaining leg (22), a transition section, and a spring leg (26). The receptacles (20) each have a receiving opening (28) bounded by the respective retaining leg (22) and the spring leg (26), with the receiving openings (28) each facing the connection plane (E). A lightning protection conductor clamp (110) for attaching at least one lightning protection or earthing conductor (112) to an equipotential bonding bar is also shown.

This invention provides a device for suppressing lightning flashover tripping of insulators in transmission lines, relating to the field of lightning protection technology for transmission lines. It includes a high-frequency filter, a low-impedance channel, and a phase change material (PCM) electric field energy absorber. The high-frequency filter is installed on the side of the overhead lightning protection line near the tower to block the lightning current generated by lightning strikes. The low-impedance channel is connected to the input end of the PCM electric field energy absorber via a coaxial cable to guide the lightning current to the PCM electric field energy absorber. The PCM electric field energy absorber is installed on the tower near the ground, and its output end is connected to the tower and grounded to absorb the electric field energy of the lightning current. This device can effectively reduce the tower potential and the amplitude of the lightning current, reducing the probability of flashover of insulators and transmission line tripping caused by lightning strikes in the power system, and improving the operational reliability of the power system.

A composite panel comprising a perforated metal foil for lightning strike protection, the composite panel comprising: a plurality of carbon layers; a perforated metal foil comprising a number of apertures and directly fastened to the plurality of carbon layers; and a protective layer made of a resin reinforced with fibers, the protective layer being fastened to the metal foil, wherein the perforated metal foil is embedded into the protective layer through its apertures, a free surface of the protective layer forms a top side of the composite panel, a thickness of the protective layer between the top side of the composite panel and the perforated metal foil is at least 15 micrometers, and a thickness of the perforated metal foil is not more than 30 micrometers, the plurality of apertures defines in total an open area of not more than 40% of the surface area, and a maximum distance between two opposite points on the aperture periphery is equal to or less than 3 mm.

An electric vehicle charger according to an embodiment of the present invention comprises an electric vehicle charging controller comprising an inlet comprising: an earthing pin coupled to a coupler and configured to connect a first earthing line connected to a first earthing power source in an electric vehicle power supply device and a second earthing line connected to a second earthing power source in an electric vehicle; a first signal pin coupled to the coupler and configured to connect a first signal line in the electric vehicle power supply device and a first signal line in the electric vehicle; and a second signal pin coupled to the coupler and configured to connect a second signal line in the electric vehicle power supply device and a second signal line in the electric vehicle, and a sensing unit connected to the electric vehicle power supply device through a third signal line and a fourth signal line so as to receive a third signal and a fourth signal. The inlet comprises a signal unit disposed between the second signal line and the third signal line, and configured to generate a second signal and then transmit same to the electric vehicle charging controller. The sensing unit comprises: a first processing unit electrically connected to the electric vehicle power supply device through the third signal line and the fourth signal line, and configured to receive the third signal and the fourth signal from the electric vehicle power supply device; a second processing unit for receiving the third signal and the fourth signal that a first sensing unit has received, and then transmitting same to a control unit; and an insulation unit for electrically isolating the first processing unit and the second processing unit from each other.