138 results about "Lightning surges" patented technology

The invention discloses an information acquisition and transmission system of track control equipment, which relates to the technical field of track traffic intelligent monitoring and comprises an intelligent sensing terminal, an edge intelligent analysis node, a safety communication module, a central control platform, a digital twin diagnosis center and a predictive maintenance engine. According to the invention, the intelligent sensing terminal integrates various sensors, adopts a permalloy shielding cavity to isolate external electromagnetic interference, is equipped with a three-stage lightning protection circuit to realize microsecond-stage lightning surge protection, can stably collect parameters of track control equipment in a severe environment, is internally provided with a lightweight LSTM model, carries out preliminary filtering analysis on original data, and is used for monitoring the parameters of the track control equipment. The device operation state can be dynamically identified, the sampling strategy can be adjusted, the basic sampling frequency is maintained in the stable state to reduce power consumption, the sampling frequency is improved by 10 times and the sensor gain is enhanced in the early warning or emergency state, all analysis decisions are completed at the local millisecond level without depending on the cloud, and the real-time performance and accuracy of data processing are effectively improved.

The invention discloses a hail early warning method and system based on lightning jump and a support vector machine, and the method comprises the steps: obtaining a combined reflectivity factor, a vertical integral liquid water content and echo top height data through radar networking data, recognizing a severe convective echo region, and calculating a lightning time change rate and a standard deviation thereof; a potential hail event is screened in combination with a lightning jump increase condition, a vertical integral liquid water content maximum value VILmax, a jump increase GVIL and a density VILD are further extracted as feature parameters, and the feature parameters are input into a support vector machine classification model based on historical sample training for secondary judgment, so that the false alarm rate of a traditional 2 sigma algorithm is effectively reduced, and the hail early warning accuracy is improved.

A power feeding device that is connected to a Faraday cage containing a flight vehicle via a conductor and supplies lightning power generated from a lightning surge that has struck to a battery of the flight vehicle, and a ground line that connects the power feeding device and a ground surface are provided, the power feeding device includes a capacitor connected in series between the Faraday cage and the ground line, a lightning arrester connected in parallel to the capacitor, and a step-down converter that steps down a terminal voltage of the capacitor charged by the lightning surge to generate lightning power and supplies the generated lightning power to the battery.

The invention discloses a method and system for evaluating lightning stroke inhibition energy of a 10kV overhead transmission line, and relates to the technical field of lightning protection of overhead transmission lines, and the method comprises the steps: collecting the data of the overhead transmission line, and constructing a partial element equivalent circuit model of a short lead and a multi-conductor transmission line model of a long lead; the method comprises the following steps: for an overhead transmission line system with a long lead and a short lead simultaneously, carrying out hybrid modeling on the long lead and the short lead, and analyzing lightning surge of a distribution network overhead transmission line; and the optimal lightning arrester configuration scheme is determined by performing simulation evaluation on different configuration schemes. According to the hybrid modeling method, the multi-conductor transmission line equation of the long wire and the partial element equivalent circuit model of the short wire are combined, propagation of lightning stroke surge is accurately analyzed, the lightning protection performance of the system is improved, the overall cost is reduced, and efficient and economical lightning protection is achieved.

The invention relates to the technical field of intelligent sensing thunder and lightning interceptors, in particular to an intelligent thunder and lightning interceptor and a lightning surge pulse protection method, and the method comprises the steps: measuring a thunder and lightning current sequence when thunder and lightning occur through a thunder and lightning current recorder, dividing the thunder and lightning current sequence to obtain thunder and lightning current subsequences, and calculating the thunder and lightning change rate of each thunder and lightning current; determining the lightning magnetic field deviation degree of each lightning current based on the difference between the lightning change rates of each lightning current and the adjacent lightning current and the average value of the lightning change rates of all lightning currents in the lightning current sub-sequence, and obtaining the lightning magnetic field interference intensity of each lightning current by combining the difference between each lightning current and the average value of the left and right adjacent lightning currents. Calculating a lightning magnetic field correction coefficient of each lightning current, and correcting each lightning current in the lightning current sub-sequence; and intercepting thunder and lightning by adopting a thunder and lightning interceptor according to the corrected amplitude spectrum and energy spectrum of the thunder and lightning wave. The lightning current data precision can be improved, and the lightning interception accuracy is ensured.

The invention relates to the technical field of multi-column lightning arresters, in particular to a multi-column lightning arrester parallel matching method, which comprises the following steps of S1, performing aging screening and energy tolerance testing on zinc oxide resistor discs of the same batch; s2, measuring the direct-current reference voltage Uref of the resistor discs, the leakage current I0 under 0.75 Uref, the impact residual voltage UL under the lightning wave and the operation residual voltage US under the operation wave one by one; s3, screening the resistor discs for three times; and S4, high-low matching is carried out by taking the operation residual voltage US as a main matching basis, so that the operation residual voltage deviation of each column of series resistor disc group is smaller than a first preset value, and the direct current reference voltage numerical value deviation is smaller than a second preset value. The strict screening process ensures the consistency of the performance of the resistor discs, and the reasonable grouping mode makes the electrical performance of each column resistor disc group more balanced, thereby achieving the effect of improving the operating wave endurance capability and the current sharing characteristic of the multi-column lightning arrester, and reducing the probability of faults caused by uneven current distribution of the MOV.

The invention relates to the technical field of SPD lightning protection, in particular to an intelligent SPD lightning protection detection system. The system comprises a data acquisition module used for acquiring leakage current, voltage and temperature of a piezoresistor; the lightning protection analysis module is used for analyzing the dispersion degree of the leakage current of the piezoresistor and the change trend of the leakage current, and determining the damage degree of the piezoresistor in combination with the temperature range of the piezoresistor and the dispersion degree of all elements in the leakage current coupling sequence; the method comprises the following steps of: analyzing the complexity and the voltage change trend of abrupt change data in the voltage of the varistors, and combining the similarity of the voltage change trends between the varistors connected in parallel to determine the voltage anomaly of the varistors; and the lightning protection detection module is used for judging the lightning protection detection precision at the current moment. According to the invention, the problem that the SPD lightning protection detection system cannot prevent lightning surge and power frequency voltage from damaging electrical equipment is solved, and the reliability of the SPD lightning protection detection system is improved.

The embodiment of the utility model discloses a lightning stroke surge protection circuit and a circuit board, and relates to the field of protection circuits, and the lightning stroke surge protection circuit comprises a lightning stroke surge protection module, a rectification filtering module, a residual voltage protection module and a load module. Wherein the power supply input end is connected with the input end of the lightning stroke surge protection module, the output end of the lightning stroke surge protection module is connected with the input end of the rectification filtering module, and the lightning stroke surge protection module absorbs lightning stroke surge voltage input from the power supply input end to obtain first reduced voltage; the first step-down voltage is transmitted to the rectification filtering module through the output end of the lightning stroke surge protection module. By adopting the embodiment of the invention, a good protection effect can be provided when lightning surge occurs in the circuit, and the accuracy is higher.

According to the electrical system surge test modeling method and the terminal provided by the invention, the lightning surge interference source model, the equipment port and impulse voltage conduction path model, the equipment insulation cooperation model and the lightning protection device model are established to perform simulation test on the response behavior of the lightning surge interference of the low-voltage electrical system; according to the invention, flow evaluation is carried out on selection of lightning protection measures and lightning protection devices of the system so as to analyze whether the lightning protection measures are appropriate after an electrical system is connected to a power distribution network, whether main facilities and equipment are damaged after lightning stroke, whether major safety consequences are generated, and whether selection of the lightning protection devices is reasonable. Damage to equipment in an actual test is avoided, and a basis is provided for lightning protection design of an electrical system; and a lightning protection device model of the surge protector is established by using a controlled voltage source principle, and voltage protection level parameters of the surge protector are output according to a current value, so that the voltage-sensitive and clamping characteristics of the real surge protector during action are simulated.

The invention discloses a photovoltaic power generation cabinet with a leakage protection function and a working method thereof, and relates to the technical field of leakage protection. Comprising the following steps that a leakage current dynamic reference model is established based on photovoltaic system operation environment parameters and historical data, and the environment parameters at least comprise illumination intensity, environment temperature and component open-circuit voltage; time domain, frequency domain and time-frequency domain joint analysis is carried out based on direct current side and alternating current side leakage current information, and multi-dimensional feature vectors including a waveform distortion rate, a high-frequency harmonic energy ratio and a transient energy entropy value are extracted; according to the method, the leakage current dynamic reference model based on the environmental parameters is constructed, the electric leakage risk can be accurately evaluated in real time in the operation of the photovoltaic system by means of time-frequency domain conjoint analysis and multi-dimensional feature vector extraction, differentiated protection strategies are automatically executed according to risk scores, and in order to improve the detection accuracy, the method is simple and convenient to operate. The system adopts self-adaptive notch filtering and FIR low-pass filtering, so that high precision can be kept even in extreme environments such as lightning surge and the like.

The invention relates to the field of explosion-proof electrical technology, and discloses an intrinsically safe output Ethernet transmission circuit, which comprises an Ethernet physical layer transceiver chip U6, a network transformer U7, an electrostatic protection diode D17, an electrostatic protection diode D18, voltage stabilizing diodes D13-16, capacitors C46-62, resistors R42-45, resistors R59-65, thick film resistors R74-77, fuses F1-4, a safety Y capacitor CY1, an inductor L2, a gas discharge tube TV1, a gas discharge tube TV2 and an RJ45 connector RJ1. The intrinsically safe output Ethernet transmission circuit provided by the invention realizes 3000V voltage isolation, has the characteristics of low cost and easiness in implementation, not only has strong anti-interference and lightning surge protection capabilities and stable transmission performance, but also is easy to calculate and check intrinsically safe parameters through multi-stage isolation and current-limiting and voltage-limiting protection, and has a wide application prospect. And multiple key problems in intrinsic safety Ethernet transmission are effectively solved.

The utility model discloses a lightning surge counting and monitoring device with a remote data uploading function. The lightning surge counting and monitoring device comprises a main control circuit board, a display control circuit board and a display module which are packaged in an outer shell, the display control circuit board is electrically connected to the main control circuit board; the display module is electrically connected to the display control circuit board and is exposed from the upper surface of the outer shell; the first end of the main control circuit board is provided with a power supply wiring terminal and a sensor wiring terminal, and the second end of the main control circuit board is provided with a communication wiring terminal. The device can record the number of lightning strokes and display the number of lightning strokes through the display module, and can also upload the number of lightning strokes, time and other data to a maintenance platform in a remote communication mode, so that maintenance personnel can know the state of the system in time. Maintenance personnel can assess and maintain the damage degree of the lightning surge protection device conveniently, the safety of an electric power system can be improved, and the risk assessment capability of the electric power system is enhanced.

The present invention discloses a transmission tower line simulation method, apparatus, device, and storage medium. A partial element equivalent circuit method is used to establish a partial element equivalent circuit model for a first subsystem consisting of a lightning channel, a tower, and overhead line segments directly connected to the tower. A one-dimensional time-domain finite difference method is used to establish a multi-conductor transmission line model for a second subsystem consisting of overhead line segments not directly connected to the tower. Interface node analysis equations are established between the first and second subsystems to jointly solve for the node voltages and branch currents of a high-voltage overhead transmission line system with a grounding wire. This method addresses the technical problems of large errors in tower surge assessments caused by traditional transmission tower models that fail to consider the mutual coupling between the lightning channel, tower, and transmission line, and inaccurate analysis of lightning surge impacts caused by the TEM-based MTL model's inability to accurately capture the true propagation behavior of electromagnetic waves on transmission line towers during lightning strikes.

A test circuit for verifying the lightning protection capability of a signal surge protector, comprising a lightning surge generator and a signal surge protector, characterized in that: it also comprises a chip 74LS00, a battery, a light emitting diode, and an inductor, wherein the A end and the B end of the chip 74LS00 are connected to the protected line terminals Y1 and Y2 of the signal surge protector, the VCC end thereof is connected to the positive electrode of the battery 4‑1, the Y end thereof and the GND end thereof are respectively connected to the positive electrode and the negative electrode of the light emitting diode, and the positive and negative electrodes of the battery 4‑2 are respectively connected to the line terminals X1 and X2 of the signal surge protector through the inductors 6‑1 and 6‑2. The circuit utilizes the low-priced chip 74LS00 to simulate the protected device of the signal surge protector, verifies the protection capability of the signal surge protector by the quality of the chip, has the characteristics of remarkable effect, economy and practicality, and is suitable for verifying the ability of the signal surge protector to protect the back-end equipment, especially the precision electronic equipment.

This application relates to the field of multi-column surge arrester technology, and in particular to a method for parallel connection and grouping of multi-column surge arresters, comprising the following steps: S1, performing aging screening and energy withstand tests on zinc oxide resistors of the same batch; S2, measuring the DC reference voltage U of each resistor. ref 0.75U ref Leakage current I0 under lightning surge, residual voltage U under lightning surge L and the residual operating voltage U under the operating wave S S3, select resistors in three stages; S4, operate the residual voltage U S The primary basis for grouping is a combination of high and low voltage resistors, ensuring that the residual voltage deviation of each series-connected resistor group is less than a first preset value and the DC reference voltage deviation is less than a second preset value. This rigorous selection process guarantees the consistency of resistor performance, and the reasonable grouping method makes the electrical performance of each resistor group more balanced. This improves the operating waveform withstand capability and current sharing characteristics of the multi-column surge arrester, reducing the probability of MOV failure due to uneven current distribution.

Embodiments of the present application relate to the field of circuit, and disclose a lightning protection circuit, a circuit board assembly and an electronic device. In the present application, the conduction states of the first switch and the second switch are determined according to the voltage of the first end of the first switch and the voltage of the second end of the second switch, but the conduction states of the first switch and the second switch must be opposite, and when the first switch is on and the second switch is off, the second polarity capacitor works; when the first switch is off and the second switch is on, the first polarity capacitor works; so that no matter which end of the lightning protection circuit receives a larger level of lightning surge, the residual voltage can be absorbed by a larger capacity polarity capacitor, thereby protecting the external circuit; since the polarity capacitor is used, the storage capacity is large, the number of capacitors to be set is small, the lightning protection level of the lightning protection circuit is improved at a small cost and a small circuit space.

The utility model provides a switching power supply circuit based on a DM6205H chip. The switching power supply circuit comprises the DM6205H chip, an overvoltage protection module, an anti-interference module, a short-circuit protection module, a half-wave rectification module and a voltage regulation module. The overvoltage protection module is used for providing limitation of lightning surge voltage; the anti-interference module is used for suppressing differential mode interference; the short-circuit protection module is used for short-circuit protection, surge current limiting, voltage dividing, EM I interference restraining and apparent power limiting; the half-wave rectification module is used for performing half-wave rectification on an input power supply to obtain a direct current signal; and the voltage adjusting module is used for adjusting the output voltage, so that quick starting and high efficiency can be realized, meanwhile, the circuit is low in no-load power consumption, and short-circuit or over-temperature protection can be realized.

1. The name of this design product: surge protector. 2. Purpose of this design product: The product is installed at the entrance where electrical lines enter the building, at the interface of the lightning protection zone and near the protected equipment. It has overvoltage protection, overcurrent protection, and overheat protection functions, and is suitable for lightning surge protection of power lines and power equipment in low-voltage power supply systems. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

In the platform, a submarine cable penetrates through an impounding reservoir, a lifting support is arranged in the impounding reservoir and supports the submarine cable in a lifting mode to form a local suspension section, and a flow generation system is arranged in the impounding reservoir to generate uniform flow and oscillatory flow towards the local suspension section. The first temperature probe measures the first temperature of a submarine cable insulating layer of the local suspension section, the second temperature probe measures the second temperature of a conductor of the local suspension section, the fiber grating sensor measures strain parameters of the local suspension section during oscillation in water, and the ultrasonic flow meter is arranged in the reservoir to measure the flow velocity. The feed-through transformer is arranged around the submarine cable outside the reservoir so as to conduct current to the submarine cable through electromagnetic induction, and the lightning surge generator is connected with the submarine cable outside the reservoir so as to generate overvoltage on a submarine cable conductor. The oscilloscope is connected with the submarine cable outside the reservoir to monitor the waveform of the overvoltage and the voltage waveform sensed by the shielding layer of the submarine cable.

The invention relates to the technical field of LED lamp manufacturing, and provides an anti-lightning surge driver light engine device in order to solve the technical problem that an existing small-size lamp product is insufficient in lightning surge resistance, the anti-lightning surge driver light engine device comprises an overcurrent protection circuit, an overvoltage protection circuit and an EMC circuit, the overcurrent protection circuit is connected to a phase line circuit in series, and the overvoltage protection circuit is connected to the EMC circuit in series. The power supply is cut off when current is abnormal; the overvoltage protection circuit is arranged between the phase line circuit and the zero line circuit and is used for absorbing transient overvoltage; the EMC circuit is arranged at the rear stage of overcurrent protection and is used for inhibiting electromagnetic interference; the overcurrent protection circuit comprises a first safety resistor, a second safety resistor, a first thermistor and a second thermistor, and the overvoltage protection circuit comprises a first piezoresistor which is connected between the first safety resistor and a zero line circuit; the second piezoresistor is connected between the second safety resistor and the zero line circuit; and the third piezoresistor is connected between the post-stage of the overcurrent protection circuit and the zero line circuit.

The application provides a surge test modeling method and terminal for an electrical system, which establishes a lightning surge interference source model, a device port and an impulse voltage conduction path model, a device insulation coordination model and a lightning protection device model, is used for simulating and testing the response behavior of lightning surge interference of a low-voltage electrical system, realizes process evaluation of lightning protection measures and lightning protection device selection of the system to analyze whether the lightning protection measures of the electrical system connected to a power distribution network are appropriate, whether main facilities and devices will be damaged after a lightning stroke, whether significant safety consequences will be caused and whether the selection of lightning protection devices is reasonable, avoids damage to the devices in actual tests, provides a basis for the design of lightning protection of the electrical system, and uses the principle of a controlled voltage source to establish a lightning protection device model of a surge protection device and make the voltage protection level parameter of the surge protection device output according to a current value, so that the voltage protection level parameter reaches the voltage resistance and clamping characteristics of the surge protection device when the surge protection device acts.

Embodiments of the present invention disclose a semiconductor discharge tube, a manufacturing method thereof, and an overvoltage protection device. Among them, the manufacturing method of the semiconductor discharge tube includes: in any device unit region of a semiconductor substrate, forming a first diffusion region and a second diffusion region of a second conductivity type separated by a body region of a first conductivity type on the semiconductor substrate; forming a groove on one side of the semiconductor substrate where the first diffusion region is provided; diffusing into the semiconductor substrate along the groove to form a third diffusion region of the first conductivity type, and the third diffusion regions are all in contact with the first diffusion region and the body region of the semiconductor substrate; forming a fourth diffusion region of the first conductivity type in the first diffusion region, and the third diffusion region and the fourth diffusion region are spaced apart; forming corresponding first conductive blocks, wherein the first conductive blocks are electrically connected to the first diffusion region and the fourth diffusion region. The technical solution provided by the embodiments of the present invention can reduce the residual voltage during lightning surges.

A lightning protection device for protecting a DC power supply device from a lightning surge current includes: a positive-electrode-side lightning arrester connected between a positive-electrode-side power cable of the DC power supply device and a ground point; and a negative-electrode-side lightning arrester connected between a negative-electrode-side power cable of the DC power supply device and the ground point, in which a difference in operating voltage between the positive-electrode-side lightning arrester and the negative-electrode-side lightning arrester is equal to or more than a reference value.

This invention discloses a surge protection circuit for gallium nitride (GaN) power devices in a power factor correction (PFC) circuit, aiming to solve the problems of insufficient surge resistance of GaN power devices and the high residual voltage of existing surge protection schemes, which easily leads to overvoltage breakdown of GaN power devices. A surge suppression unit is set between the rectifier circuit and the PFC main circuit. The surge suppression unit adopts a common-mode inductor containing a first coil L2A and a second coil L2B, coupled with a varistor VR4 in series, and is paired with capacitors C1 and C2 to form a π-type filter. Under normal operating conditions, it performs voltage filtering. During a lightning surge, VR4 breaks down, generating a surge current in L2A. The second coil L2B couples to generate a reverse electromotive force to offset the surge voltage, reducing the residual voltage at the input of the PFC main circuit. A primary protection unit assists in surge suppression. The PFC main circuit adopts a Boost topology and GaN power devices. This circuit has a simple structure, low cost, and high reliability, and is suitable for surge protection of outdoor GaN power supplies such as LED streetlights.

The invention discloses a lightning protection surge protection device based on household appliances, and belongs to the technical field of lightning protection. The protector main body is divided into two parts, the first part comprises an integrated plug and a leakage current protector, the second part is provided with an MOV surge protection module and an overvoltage and undervoltage module, and the two parts are connected through a cable and are adaptive to various household electric equipment. The protector is further integrated with a ground shortage detection module, a power output relay, a piezoresistor, a filtering module and a resistance-capacitance voltage reduction module, the response time of the MOV surge protection module reaches 25 ns, and lightning stroke current can be rapidly discharged; the overvoltage and undervoltage module is matched with a TL431 voltage reference device through an LM339 voltage comparison chip to realize overvoltage and undervoltage detection and power supply control; the ground lacking detection module is provided with a red light for indication to timely warn grounding hidden dangers. The lightning protection device can effectively reduce the damage of lightning stroke to personnel and equipment, deals with voltage fluctuation, and is simple and convenient to install and high in safety.

The present invention discloses a circuit for reducing lightning surge current, comprising a common mode filter module, a bridge rectifier DB1 connected to the common mode filter module, and a capacitor CE1, wherein the bridge rectifier DB1 is connected in parallel with the capacitor CE1 and then connected to a load, the common mode filter module comprises a common mode filter L1, and a coil arranged on the common mode filter, a varistor RV1 is connected between the common mode filter L1 and the alternating current, and the varistor RV1 is connected to the coil, and the present invention significantly reduces the lightning surge current of the entire circuit by adding a coil on the common mode filter and then connecting the varistor, and adding the coil and the varistor not only has low cost, but also effectively reduces the lightning surge current stress, avoids damage to the entire circuit, and increases the lightning surge resistance of electrical equipment.

Embodiments of this application provide a power control circuit and a control method thereof, applied to the energy field. The power control circuit includes an alternating current power supply module, a power module, and a control module. The power module includes a bridgeless power factor correction circuit. A sampling module in the alternating current power supply module samples a current signal output by an alternating current power supply or the power module, and outputs an obtained sampled signal to the control module. The control module controls on and off of a switch element in the alternating current power supply module based on the received sampled signal, and the control module switches off the switch element when the sampled signal includes a lightning surge signal, to avoid damage to the switch element. In addition, the control module is further configured to perform current metering on the sampled signal, so that the power control circuit including the bridgeless power factor correction circuit achieves a plurality of functions including switch control, lightning protection, and current metering simultaneously.

The invention discloses an intelligent lightning protection detection system, and belongs to the technical field of lightning protection detection. The system comprises a lightning protection grounding isolation device, a lightning protection counterattack box, a grounding resistance monitor, a surge monitor and a monitoring platform. The lightning protection grounding isolation device adopts an isolation type grouping grounding technology, realizes independent operation of working grounding, protection grounding and lightning protection grounding through a grounding isolation suppressor, and has multiple monitoring functions; the lightning protection counterattack box is connected in series between the signal ground or the working ground and the lightning protection grounding line, and discharges lightning surge in a directional manner; the grounding resistance monitor measures the resistance by using a precise three-wire method; the surge monitor collects lightning current parameters and records events; the monitoring platform manages data in a centralized manner, and provides real-time alarm, historical query and remote monitoring. The system improves the lightning protection effect, achieves the real-time comprehensive monitoring, is convenient in data management, is energy-saving and environment-friendly, and is high in compatibility.

The invention belongs to the technical field of equipment power utilization protection, and discloses a protection device and a protection method for preventing lightning stroke damage, and the protection device comprises an overvoltage protector which is connected with a power supply line, then is grounded, and is used for limiting transient overvoltage and discharging surge current; and the fuse is connected in series in a loop where the electric equipment is located and cuts off the loop where the electric equipment is located when the residual current exceeds the steady-state working current of the electric equipment, and the electric equipment takes the electric energy from the power supply line. According to the invention, electrical equipment can be effectively protected from being damaged by lightning surge current and residual current, long-term stable operation of the equipment is ensured, specifically, the current can be cut off in time through a quick response mechanism of the fuse, overload or short circuit of the equipment is avoided, and the safety and reliability of the equipment are improved.