248 results about "Lightning surges" patented technology

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).

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.

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 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 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 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 relates to a central vertical grounding leading-down method for a composite pole tower and the pole tower thereof. An earth wire cross arm is made of metal material, a grounded leading-down wire is led out of the center of the earth wire cross arm, and the grounded leading-down wire is vertically led down from the right center of the composite pole tower and connected to the ground; and if the lower part of a tower body is provided with a steel pipe, the grounded leading-down wire can be directly connected on the steel pipe and grounded. By using the insulating strength of the tower wall of the composite pole tower, the lightning surge resistant insulating strength of a circuit is enhanced, the grounded leading-down wire is prevented from being short-circuited with the tower body of the composite pole tower, and the insulating effect of the composite tower body is exerted; and because the grounded leading-down wire passes through the inner side of the pole tower, the grounded leading-down wire exposed outside is prevented from being damaged by external force such as strong wind and the like, the pole tower has a simple structure, and the method is easy to implement.