248 results about "Lightning surges" patented technology

A modular lightning surge protection apparatus is applied to a single-phase three-wire power system with a line, a neutral, and a ground. The modular lightning surge protection apparatus includes a substrate, a surge protection unit, a first temperature fuse, and a second temperature fuse. The surge protection unit has a first surge protection element, a second surge protection element, and a third surge protection element to form a wye connection or a delta connection structure. Furthermore, the surge protection unit, the first temperature fuse, and the second temperature fuse are electrically connected on the substrate to form a small-scale modular circuit integration structure.

The network filtering circuit includes a cable side for connection with a network cable, a physical side for connection with a mother board, and a plurality of transmission channels connected between the cable side and the physical side. Each of the transmission channels includes an isolation transformer with a primary coil connected with the cable side and a secondary coil coupling with the primary coil. A common mode choke has two first ends connected to the physical side and two opposite second ends. A pair of capacitors series connection with the corresponding second ends and are connected between the secondary coil and the common mode choke. The primary coil has a first center tap directly connected to a ground node.

The invention discloses a direct current power supply input reverse irrigation prevention circuit and method. The circuit comprises a reverse connection prevention circuit, a soft start circuit and a sampling control circuit. The reverse connection prevention circuit comprises a reverse connection prevention metal oxide semiconductor field effect transistor MOSFET. The slow start circuit comprises a slow start MOSFET. The sampling control circuit samples voltage between the drain and the source of the slow start MOSFET. When the voltage between the drain and the source of the slow start MOSFET is less than the reference voltage, the reverse connection prevention MOSFET is controlled to switch off. According to the invention, current reverse irrigation is avoided when input short circuit occurs or input voltage rapidly drops; when a DC / DC converter uses a full bridge circuit, the increasing of the voltage stress of the secondary synchronous rectifier MOSFET drain and source of the converter and the damage of the MOSFET are avoided; when reverse lightning surge occurs in an input port, current reverse irrigation is avoided; and power supply output power-off caused by module input capacitor power-off is avoided.

The invention discloses a lightning surge generator. By arranging a quick sampling circuit for synchronously acquiring voltage and current waveform data of surge pulse in an instrument, the test data can be intuitively and quickly analyzed, integration of test and analysis is realized, the operation is more convenient, and meanwhile, the cost of a test instrument is reduced. By intelligently designing a control unit, the tested voltage and current waveform data are compared with the limit value of the tested equipment to automatically screen unmatched products, so the test efficiency is greatly improved. The control unit can also control sequential increment of the surge pulse according to a certain step length, so that the surge resistant level of the tested equipment can be accurately positioned, a minimum breakdown voltage can be found, great damage to the tested equipment can also be avoided, and the safety is higher.

A lightning arrestor (1) for flowing the thunder surge current due to lightning strike (7) to the ground comprises a steel pipe (3), a conductor (4) coaxially disposed in the steel pipe (3), an a filler (10) placed between the steel pipe (3) and the conductor (4) and having a conductivity. With this, the thunder surge current flowing through the lightning arrestor (1) is divided. The low-frequency component flows through the conductor (4), and the high-frequency component flows through the steel pipe (3) outside the conductor (4) and the filler (10).

A lightning surge detector 1 includes a first terminal unit 3 connected to a ground-side terminal unit of a surge protective device, a second terminal unit 4 connected with a ground wire, a conducting coupling bar 5 adapted to couple the first terminal unit 1 and the second terminal unit 4, a detection coil 7 placed in a vicinity of the conducting coupling bar 5 and adapted to detect a lightning surge current flowing through the conducting coupling bar 5, a waveform processing unit adapted to stretch a voltage waveform of the detected lightning surge current and thereby output a waveform-modified voltage, a computation control unit adapted to produce a calculation result of the lightning surge current from the waveform-modified voltage, and a display unit 40 adapted to display the calculation result, wherein all the above components are unitized by being housed in a casing 2.

The present invention discloses a 10kV power distribution tower grounding impulse response curve testing device which comprises an impulse current wave generation module, a dual-channel transient voltage waveform collection module for collecting a transient response voltage waveform, a data analyzing and processing module which is connected to the dual-channel transient voltage waveform collection module and is used for drawing an impulse response curve according to the collected transient response voltage waveform, a data storage module which is respectively connected to the dual-channel transient voltage waveform collection module and the data analyzing and processing module and is used for storing the transient response voltage waveform and the impulse response curve, a data transmission module which is connected to the data storage module and is used for transmitting the data stored in the data storage module, and a client which is respectively connected to the impulse current wave generation module and the data transmission module. According to the 10kV power distribution tower grounding impulse response curve testing device, in the condition of no power cut and no tower grounding excavation, the grounding characteristic of the tower grounding in a lightning surge or transient short-circuit fault condition can be obtained.

The invention discloses an impact current generating device for testing lightning surges. The device comprises a multi-waveform switching module for providing impact currents, a pneumatic execution module and a state feedback mechanism, wherein the pneumatic execution module comprises an air cylinder and a solenoid valve which is arranged between the air cylinder and an air source; and the multi-waveform switching module comprises a plurality of capacitors, harmonic resistor units and switch groups. Respective upper copper plates of the switch groups in a discharge circuit are fixed on a piston rod of the air cylinder, and movable touch blocks are arranged on the lower surface of the upper copper plate; respective static touch blocks of the switch groups are fixed on a base through a hemispherical rod, gaps are left between the static touch blocks and the base, and a hemispherical face at the upper end of the hemispherical rod is embedded in grooves on the lower surfaces of the static touch blocks. The state feedback mechanism comprises a connection rod and a travel switch. One end of the connection rod is placed under the upper copper plates and is higher than a plane where the static touch blocks are in, and the other end of the connection rod is mounted on the travel switch. By means of the impact current generating device, the contact adhesion and burning under large instantaneous currents is prevented, the contact performance is good, and the surface point contact or surface line contact does not exist.

The invention discloses an anti-thunder and anti-surge circuit, and relates to the technical field of lightning protection; the anti-thunder and anti-surge circuit comprises an anti-thunder circuit which is bridged between a live line and a null line of a power supply and is used for restraining lightning surge, and an anti-surge circuit which is arranged behind the anti-thunder circuit and is used for restraining continuous surge and further restraining lightning stroke residual voltage; the anti-surge circuit comprises a bridge type rectifier and a wave-eliminating circuit, wherein the inputof the bridge type rectifier is connected to the two ends of the power supply in a bridging mode; and the wave-eliminating circuit is bridged at the output end of the bridge type rectifier and is used for providing fast energy storage and discharging functions. The anti-thunder and anti-surge circuit with the current limiting function and capable of absorbing continuous surge can achieve the lightning protection effect of 12 kV, and in addition, the service life of an anti-thunder and anti-surge device is effectively prolonged, and the long-term reliability of the anti-thunder and anti-surgecircuit is effectively guaranteed.

Malfunction of an earth leakage breaker due to a lightning surge is prevented, and when a lightning arrester is short-circuited and damaged by a high-level lightning surge, a power supply short circuit is prevented.A contact 41, an overcurrent detector section 43, and a zero phase current transformer 44 are disposed in order from a power supply side to a load side, and a lightning arrester 3 is connected between the overcurrent detector section 43 and the zero phase current transformer 44.

The invention relates to a partial discharge interferometric monitoring device of a transformer. The device comprises an additional electric field generator-a lightning surge generator, an optical monitoring system comprising a He-Ne laser and a Michelson interferometer, and an interference fringe capturing device-a CCD camera; wherein the Michelson interferometer comprises a beam expander, a beamsplitter and two reflectors M1 and M2, and a tested system is put in an object optical path of the Michelson interferometer. The partial discharge interferometric monitoring device can monitor the phenomena whether power equipment has electric spark and undergoes voltage and current jump in real time and the like, so as to alarm timely to prevent the occurrence of accidents such as fire disastersand damage of equipment or electronic elements, the device can be used in the field of power electronics, can quantitatively calculate electric field strength around a device in a switching process by measuring overshoot voltage and current caused in switching process of a power electronic device, thereby providing reference for parameter selection of the electronic device and design of a protective circuit; and the device is simple in structure, is greatly lowered in cost, is not contacted and has good security.

The invention relates to a circuit of a miniature electric leakage circuit breaker. The circuit of the miniature electric leakage circuit breaker comprises a power supply circuit, and is characterized by also comprising an electric leakage signal conditioning circuit, an electric leakage detection control unit, an electric leakage detection control unit required circuit, an electric leakage testing circuit and a tripping circuit, wherein the power supply circuit is connected with the electric leakage testing circuit, the electric leakage detection control unit and the tripping circuit; the electric leakage signal conditioning circuit is connected with the electric leakage detection control unit; the electric leakage detection control unit required circuit is connected with the electric leakage detection control unit. According to the circuit of the miniature electric leakage circuit breaker provided by the invention, the withstand voltage value of the tripping circuit is increased, the lightning surge resistance is improved, and moreover, the cost performance is high; the working temperature rise of the power supply circuit is reduced, the product reliability is improved, the pulse packet resistance of a product is improved, and the false tripping phenomenon of the product is reduced. The circuit of the miniature electric leakage circuit breaker is simple in design, strong in EMC (electromagnetic compatibility) resistance, high in reliability and low in cost, and more meets the actual demand of the miniature electric leakage circuit breaker.

The invention discloses an intelligent safety electric instrument linkage management and control system of a gas station and an application method thereof. The system comprises a power monitoring unit, an oil gas monitoring unit, an atmospheric environment monitoring unit, a lightning surge monitoring unit, a communication unit, an electric instrument linkage main control unit and a management andcontrol platform. The management and control platform includes a remote control host and a monitoring device which are used for monitoring and controlling operation of a power system; the control host is connected with the communication unit through a wireless signal and acquires e control information of the electric instrument linkage main control unit via the communication unit. The electric instrument linkage main control unit is connected with the power monitoring unit, the oil gas monitoring unit, the lightning surge monitoring unit and the atmospheric environment monitoring unit throughRS485 interfaces. The electric instrument linkage main control unit uploads information of all the units to a remote control host server through the communication unit and stores the information in amain memory; and the control host displays the information through the monitoring device and carries out displaying and alarming on various conditions.

The invention provides a protection circuit for a lightning surge. The protection circuit is formed by connecting a first bleeder circuit with a noise filtering circuit; the first bleeder circuit is formed by connecting a voltage dependent resistor MOV1 with a resistor R1, wherein the resistor R1 is connected to the position behind the voltage dependent resistor MOV1 in series; the voltage dependent resistor MOV1 is used for providing a low-resistance bleeder channel for impulse currents generated by the lightning surge; the resistor R1 is used for increasing input impedance, so that more impulse currents are bled by the voltage dependent resistor MOV1; the noise filtering circuit is formed by connecting a differential mode inductor L1 with a safety capacitor CX, wherein the differential mode inductor L1 is connected to the position in front of the safety capacitor CX in series; when the lightning surge generates the impulse currents, the noise filtering circuit is used for further filtering residual voltage peaks of the first bleeder circuit; when noise of a next-stage circuit is transmitted forwards, the noise filtering circuit is used for filtering the noise of the next-stage circuit. Compared with the prior art, the protection circuit has the advantages that damage of the lighting surge to a switch power supply in actual use is significantly reduced, and the electromagnetic compatibility (EMI) performance of the switch power supply can be improved.

A surge protective system has a plinth for wiring and is connected between a plurality of line side wires and a ground wire. A plurality of surge protective devices (SPDs) and one surge detector are disposed in parallel and detachably fitted into and attached to the plinth. The plinth has a wiring metal fitting for connecting the plurality of SPDs and the one surge detector. When a lightning surge current enters into the surge protective system from the line side wires, the lightning surge current flows to the surge detector through the SPDs, a 1st plinth contact part in the wiring metal fitting, a connection part and a 2nd plinth contact part. The lightning surge current flowing to the surge detector is discharged to the ground through the ground wire.

The invention relates to a toothed disc type wind power generation lightning arrester. The lightning arrester is characterized in that the lightning arrester comprises an external toothed disc and an internal toothed disc positioned in the center of the external toothed disc; the external toothed disc and the internal toothed disc are oppositely provided with sharp teeth which can achieve a point discharge effect toward the side of the moving gap; the center of the internal toothed disc is provided with a hole through which a main shaft of a fan passes; one toothed disc is fixed on a wheel boss of the fan and synchronously rotates along with the wheel boss, and the toothed disc fixed on the wheel boss is electrically connected with a lightning receiving needle fixed on a fan blade; and the other toothed disc is fixed at the front end of a cabin shell and directly connected with a ground wire. By the matching of the sharp teeth of the moving gap of the internal toothed disc and the external toothed disc, the lightning guided by the lightning receiving needle fixed on the fan blade forms the point discharge phenomenon in the sharp tooth structure between the internal toothed disc and the external toothed disc and is quickly and directly discharged to the ground, so that the electric generator or other units avoid lightning surge damage to the maximum extent.

The invention relates to a test piece failure distinguishing system and a test piece failure distinguishing method for a lightning surge test. The test piece failure distinguishing system comprises a lightning surge testing device, a pulse peak detecting device, a control unit and an upper computer; the pulse peak detecting device is connected with the lightning surge testing device; the control unit is connected with the pulse peak detecting device and the lightning surge testing device through buses; the upper computer is connected with the control unit; when the lightning surge test is performed, the pulse peak detecting device is started by the control unit to detect peak current and peak voltage which are born by a test piece; the control unit acquires the detected peak current and the detected peak voltage from the pulse peak detecting device, transmits the peak current and the peak voltage to the upper computer, judges the peak current and the peak voltage, controls the lightning surge testing device to stop the test and simultaneously gives an alarm if the peak current is higher than threshold current; and the upper computer automatically generates a test report according to the peak current and the peak voltage. Compared with the prior art, the test piece failure distinguishing system and the test piece failure distinguishing method for the lightning surge test have the advantages that whether the test piece fails or not can be quickly distinguished, and practicality is high.

The invention discloses a combined type lightning arrester based on a disc-shaped multi-gap arc extinguishing and lightning protection device, in particular to a lightning arrester applied to overheadlines above 10KV. The structure of the invention is as follows: upper and lower connecting fittings are respectively arranged on the upper and lower parts of the insulating support rod, the upper spherical electrode is connected with the upper connecting fittings, the lower spherical electrode is connected with the lower connecting fittings, a first, second,.. N-th disk-shaped multi-gap arc extinguishing lightning protection device is serially connected between the upper connecting fittings and the lower connecting fittings, N is a natural number, 1 <= N <= 8. The lightning current is elongated, elongated and ejected to extinguish the electric arc, thereby avoiding the occurrence of inter-phase short circuit fault and reducing the counterattack probability caused by lightning strike lightning protection wire; and the lightning current is elongated, elongated and ejected. Strong ability to withstand lightning surge, large flow capacity, high security; Good consistency of discharge gapsize; Simple structure; The special multi-gap arc will not be reignited because of the rapid recovery of dielectric insulation after the power frequency continues to flow through the zero-extinguishing arc.

The invention relates to a novel surge protection device. The novel surge protection device mainly comprises a current sensor, a relay, a current blocker, a linkage mechanism, a lightning protection element and a breaking switch. The lightning protection element is connected with the breaking switch in series, the current blocker works in cooperation with the current sensor and the relay, the breaking switch is controlled through a bypass, lightning surges can be discharged normally, power frequency currents of more than 3A can be switched off, and the novel surge protection device is safe and reliable. The novel surge protection device is convenient to mount, the dead zone of an existing SPD overcurrent protection mode is avoided, and high reliability is achieved.

A lightning surge protection circuit according to the present invention is a serial circuit of a surge absorber (1) and a diode (2), and a terminal of the surge absorber (1) corresponding to the cathode of a diode is connected to the cathode of the diode (2). The lightning surge protection circuit according to the present invention is used in such a way that a terminal of the surge absorber (1) corresponding to the anode of a diode is grounded, and the anode of the diode (2) is connected to a power supply line of a product such as an LNB or a SW-BOX. A varistor (6) may be used instead of the surge absorber (1), and a capacitor (4, 7) may be used instead of the diode (2).

The invention discloses a surge protector which can solve the surge caused by load switching in power system (Switching Surge) or the surge caused by that lightning directly or indirectly hits on buildings (Lightning Surge), so as to further protect electric products from being damaged by the surge. The surge protector is provided with a body which is provided with a hollow space; wherein, a channel penetrates the wall surface of the hollow space and leads to outside; two terminal electrodes away form each other are tortuously arranged in the hollow space from the outside. When the surge is produced, the hollow space, the channel and the outside form an electric release and discharging path to protect a load circuit from lightning or static electricity and the surge.

This invention relates to the technical field of optical communication, and specifically relates to an electrical port module. The electrical port module comprises at least one first-stage protection circuit, a network interface socket, a network transformer, a second-grade protection circuit and a network card physical interface chip; the network interface socket, the network transformer, the second-grade protection circuit and the network card physical interface chip are electrically connected in sequence; the network transformer is used for isolating the network interface socket and the network card physical interface chip; the first-stage protection circuit is electrically connected between the center tap of the first end of the network transformer and the ground, and is used for limiting common mode surge signals received from the network interface socket; and the second-grade protection circuit is arranged between the positive end and the negative end of a differential signal line of the second end of the network transformer, and is used for limiting difference mode surge signals received from the network interface socket. The electrical port module is prevented from being damaged by lightning surge signals received from the network interface socket; and thus, the reliability of the whole module is improved.

The invention relates to an anti-lightning surge circuit of a switching power supply. The anti-lightning surge circuit comprises an inactive absorbing network, which is connected between a rectifying circuit and a filter capacitor of the switching power supply, wherein when lightning surge happens, the generated surge current is released through the inactive absorbing network; and when lightning surge does not happen, the inactive absorbing network does not work. According to the anti-lightning surge circuit of the switching power supply, the circuit structure is simple and effective, the anti-lightning surge ability of the power supply is improved, and the reliability of the power supply is increased.

The invention relates to a circuit for enhancing the use reliability of a discrete LED (Light-Emitting Diode) light source and belongs to the technical field of LED lighting. The circuit comprises an aluminum base copper-clad plate, a discrete LED light source D11, a diode D21, a pressure-sensitive resistor R1 and a recoverable fuse R2, wherein the aluminum base copper-clad plate is divided by an insulating material and forms a positive electrode end and a negative electrode end; the discrete LED light source D11, the diode D21, the pressure-sensitive resistor R1 and the recoverable fuse R2 are fixed on the aluminum base copper-clad plate; one end of the recoverable fuse R2 is connected with the positive electrode end of the aluminum base copper-clad plate, and the other end of the recoverable fuse R2 is connected with a positive electrode of the discrete LED light source D11, a negative electrode of the diode D21 and one end of the pressure-sensitive resistor R1; and a negative electrode of the discrete LED light source D11, a positive electrode of the diode D21 and the other end of the pressure-sensitive resistor R1 are connected with the negative electrode end of the aluminum base copper-clad plate. The circuit has the advantages that the problem of light attenuation generated to LED impact as the discrete LED light source D11 suffers from lightning surge and instantaneous power-on / off in the running process is solved, and the circuit has the advantages of energy conservation, long service, environment friendliness and low maintenance cost.

The invention discloses a short-circuit protection device for a power frequency current and lightning surge automatic selection channel and relates to the technical field of lightning protection. The short-circuit protection device comprises a power supply and a power supply lightning arrester. An inlet wire terminal, a splitting or integrating device, a power frequency channel device, a lightning surge channel device and an outlet wire terminal are arranged in a machine casing. The power supply, the inlet wire terminal, the splitting or integrating device, the power frequency channel device, the outlet wire terminal and the power supply lightning arrester are connected in sequence, and the lightning surge channel device is in parallel connection with the power frequency channel device. Front-end protection of the power supply lightning arrester is achieved, the problem that dripping occurs when a power supply line is subjected to lightning hazards is solved, the lightning arrester structure is simplified, the technical requirements for a varistor are reduced, and the short-circuit protection device is suitable for front-end protection of various power supply lightning arresters and short-circuit protection of a main power supply in a frequent lightning area.

The invention relates to an Ethernet port circuit and provides an external Ethernet port lightning protection circuit, an external lightning protection device and an internal Ethernet port lightning circuit which are used for improving the lightning surge preventing capability of the traditional Ethernet port. A primary isolated transformer is added on the basis of the traditional first-stage isolated transformer to form a double isolated protection; the Ethernet port lightning protection device is added on the external Ethernet port lightning protection circuit under the condition without making any change on the traditional network equipment, so that the lightning preventing capability of the network equipment is remarkably improved, an extra grounded wire is free from being arranged and the deployment is convenient. The internal Ethernet port lightning circuit adopts the compatible design, and an RJ45 with a transformer port is used to doubly improve the lightning preventing capability while not adding the area of a printed circuit board when the lightning preventing protection needs enhancing.

The invention discloses a system and a method for measuring lightning discharge electron density in a long air gap and relates to the technical field of an electric power system. The measuring system and method are used for acquiring the electron density of a high-precision pouring, guidance and tail-jump conversion process, promoting the degree of research on a discharge physical mechanism under long air gap lightning surge and finally increasing the lightning protection capacity of the electric power system. The measuring system comprises an impulse voltage generator, a capacitive voltage divider, a measuring resistor, a plate electrode, a rod electrode, a spectrograph, an ICCD camera and an oscilloscope, wherein the rod electrode is located above the plate electrode. The measuring method is applied to the measuring system provided by the technical scheme. The measuring system and method provided by the invention are applied to the research on lightening prevention of the electric power system.

The invention discloses a lightning protection electromagnetic relay. The lightning protection electromagnetic relay is mainly composed of an electromagnetic relay body, a surge hysteresis unit, a shunting unit, a lightning early warning unit and a control unit; the relay body is used for controlling the breaking of an electric conduction loop; the surge hysteresis unit is used for delaying time for surge to arrive at the relay body; the shunting unit is used for dispersing surge current in the electric conduction loop; and the lightning early warning unit breaks the electric conduction loop before lightning occurs. Compared with the prior art, and according to the lightning protection electromagnetic relay of the invention, the whole electric conduction loop is broken through the relay, so that lightning surge can be effectively prevented from damaging electronic components in the electric conduction loop; and the lightning early warning unit is adopted, so that early warning against lightning can be performed in advance according to the surrounding environment of the relay body, and reaction time of the relay body can be prolonged, and the lightning surge can be prevented from damaging the electronic components in the electric conduction loop.