63 results about "Nonlinear resistor" patented technology

A method for battery power management based on battery nonlinearity characterization and compensation using a nonlinear resistor-capacitor (RC) equivalent circuit model (ECM) may include: measuring a current, a terminal voltage, and a temperature of a battery; implementing the nonlinear RC ECM comprising fixed, logarithmically spaced time constants and current dependent resistances and capacitances; constraining resistances of the nonlinear RC ECM to be nonnegative and performing a nonlinearity characterization procedure using the nonlinear RC ECM configured to characterize variations of a battery impedance with current amplitudes over a range of frequencies and create ECM parameter variations with current amplitudes by fitting impedance variations by nonlinear RC ECMs; performing online estimation of the nonlinear RC ECM using a battery current and a terminal voltage of the battery over time; and modifying the online estimated nonlinear RC ECM using ECM parameter variations to compensate for nonlinearity of the battery.

The invention discloses a state evaluation and fault early warning method and system based on superconducting current limiter modeling, an electromagnetic heat multi-physical field coupling model of a superconducting current limiter is constructed based on finite element software, and the method comprises the following steps: constructing a three-dimensional geometric structure of a solenoid-shaped superconducting current limiter, and setting a peripheral electromagnetic environment boundary; establishing an electromagnetic field control equation based on a Maxwell equation set and the nonlinear resistivity characteristic of the superconducting material, and coupling a solid heat transfer control equation to form a multi-physical field interaction model; optimizing grid division to balance calculation precision and solving efficiency; body parameters of the superconducting current limiter including the initial critical current Ic0 and the critical temperature Tc and working condition parameters including the environment temperature and the transmission current It are input, the parameters are dynamically adjusted according to the actual operation scene, and the voltage U at the two ends during normal operation is calculated through a model; by collecting voltage measured values Up at the two ends of the superconducting current limiter during actual operation in real time, whether the voltage measured values Up exceed a threshold value set according to the voltage U or not is judged, and an early warning mechanism is triggered.

The invention discloses a current transformer secondary open circuit protector, which relates to the technical field of power protection and comprises a first current transformer, a second current transformer, a central processing unit, a nonlinear resistor and a switch. The switch is connected to a tested circuit through a primary winding in the first current transformer; the central processing unit is used for sensing whether the primary side circuit of the second current transformer is open or not, the central processing unit is further used for outputting an action signal according to a signal sensed by the second current transformer, and the action signal is used for controlling the switch to be switched on; the non-linear resistor is connected in parallel between the primary winding of the first current transformer and the ground wire, and the non-linear resistor is used for limiting overvoltage generated when the primary side of the current transformer is open-circuited. And the overvoltage generated during the secondary open circuit of the protected circuit is limited.

The invention discloses a resonance elimination method and system based on a PT primary side neutral point connected with a zinc oxide nonlinear resistor, and belongs to the technical field of ferromagnetic resonance suppression in an electric power system. The method comprises the following steps: collecting a real-time zero-sequence voltage amplitude and a real-time zero-sequence current amplitude; obtaining the maximum real-time signal frequency; judging the relationship between the maximum real-time signal frequency and a signal frequency threshold value so as to identify the type of ferromagnetic resonance; and according to the type of the ferromagnetic resonance, selecting and controlling the disconnection or connection of the zinc oxide nonlinear resistor so as to suppress the ferromagnetic resonance. Two zinc oxide non-linear resistance valve plates with different volt-ampere characteristics are connected to the neutral point of the primary side of the PT, the zero-sequence voltage and the zero-sequence current are combined to comprehensively judge and control the power electronic switch to input one resistor, and the purpose of effective resonance elimination is achieved.

The present invention discloses an insulator structure with comprehensive protection function, which belongs to the technical field of overhead line arresters. By respectively arranging a multi-gap lightning protection component and a current limiting component at both ends of the insulator body, and utilizing the nonlinear resistance characteristics of the current limiting component, the insulator structure can present a low resistance characteristic when being acted upon by an overvoltage, and present a high resistance characteristic under the subsequent power frequency current, thereby helping the lightning protection component to well realize the discharge of overcurrent and the blocking of power frequency current, and ensure the protection performance of the insulator structure. The insulator structure with comprehensive protection function of the present invention has a simple structure, is easy to set up and maintain, and utilizes the corresponding arrangement of the current limiting component and the lightning protection component, so that the insulator structure can present a good insulation effect and protection effect when being acted upon by an overvoltage of a distribution line or a lightning overvoltage, so that the insulator structure has strong environmental adaptability, can adapt to transmission lines in various environments, and has good application prospects and promotion value.

The embodiment of the invention provides a unit excitation de-excitation system and method, and the system comprises a controller which is used for controlling the trigger angle of a three-phase full-control bridge to be switched from a rectification state to an inversion state during normal shutdown so as to achieve inversion de-excitation, and recognizing a fault signal and triggering a de-excitation switch during accidental shutdown; the three-phase full-control bridge is electrically connected to an excitation winding of the generator and is configured to provide rectification or inversion voltage under the control of the controller; the field suppression switch is connected in series in the excitation loop and is configured to respond to a signal of the controller to disconnect the excitation loop during accidental shutdown; the non-linear resistor is connected to the excitation winding in parallel and is configured to absorb residual energy in the rotor when the field suppression switch is switched off; and the protection device is configured to monitor the excitation current and voltage in real time and trigger a protection action when an abnormality is detected. Energy waste of traditional resistor de-excitation is avoided, reliable de-excitation can still be ensured under the extreme fault condition, and the rotor is prevented from being damaged due to overheating.

The application mainly relates to a nonlinear resistance strain sensor. The nonlinear resistance strain sensor comprises an elastic base and a conductive substance, and the conductive substance is uniformly distributed on the elastic base. When the elastic base is pulled, the length of the elastic base is correspondingly lengthened, the density of the conductive substance on the elastic base is reduced, and the overall resistance is changed. In the above manner, the nonlinear resistance strain sensor has the nonlinear high-sensitivity resistance strain performance.

The utility model belongs to the technical field of electric power and electric appliances, and discloses reliable closing and opening switch equipment, which comprises a controller, an A-phase Spark module, a B-phase Spark module, a C-phase Spark module, a first circuit breaker, a second circuit breaker, a third circuit breaker, a first nonlinear resistor, a second nonlinear resistor, a third nonlinear resistor and a cabinet body, an A-phase Spark module and a first nonlinear resistor are connected in parallel in a first circuit breaker, a B-phase Spark module and a second nonlinear resistor are connected in parallel in a second circuit breaker, and a C-phase Spark module and a third nonlinear resistor are connected in parallel in a third circuit breaker. And the A-phase Spark module, the B-phase Spark module and the C-phase Spark module are controlled through the controller, so that inrush current suppression during switching on is realized. Meanwhile, through a first nonlinear resistor, a second nonlinear resistor and a third nonlinear resistor, energy absorption during opening is realized. And the reliability of the whole switching-on and switching-off switch equipment is improved.

The invention discloses a voltage distribution measurement method based on a nonlinear resistance network. According to the method, a physical grid model composed of a linear resistor and a nonlinear current source is constructed, and a node voltage model equation is established by taking a grid original point as a potential reference point. Two-dimensional measurement data are subjected to dimensionality reduction to form a univariate function by utilizing network physical symmetry, and efficient calculation is realized by combining an FPGA (Field Programmable Gate Array) pipeline architecture. And when the detected voltage value is lower than-15V, starting a cut-off protection mechanism to force the clamping voltage and closing the current source. And finally, a voltage change curve and a two-dimensional thermodynamic diagram are generated through a visualization module, and voltage distribution is visually reflected. The method solves the problems of large error, poor real-time performance and circuit oscillation of a traditional measurement method, is suitable for nonlinear resistance network voltage monitoring in the fields of condensed state physics, plasma control and the like, and has the advantages of high measurement precision, high response speed, reliable hardware protection and the like.

The invention discloses a device and a method for testing electrical parameters of a nonlinear resistor, the device comprises an industrial control computer, an isolation sampling circuit and an output module, and the industrial control computer comprises a man-machine interaction module and a data processing module; wherein the man-machine interaction module is used for receiving an instruction comprising a test item, a test mode and a set test parameter of a non-linear resistor electrical parameter test, and displaying test data and a test result in real time; the output module is used for outputting corresponding test voltage and / or test current to the nonlinear resistor based on the instruction received by the man-machine interaction module; the isolation sampling circuit is used for collecting test data of the nonlinear resistor under the current test in an electrical isolation mode; and the data processing module is used for processing the test data and generating a test result. According to the device, high-precision and anti-interference electrical parameter measurement of the nonlinear resistor can be realized, and the diversity of test contents and the accuracy of test results are improved.

The present application provides a multi-port hybrid DC circuit breaker and its control method. The multi-port hybrid DC circuit breaker includes at least two current-carrying branches, at least two commutation branches and a breaking branch. The current-carrying branch includes a first fast mechanical switch and a unidirectional commutation switch connected in series. One ends of the current-carrying branches are connected to each other to form a DC bus; the commutation branch includes a diode upper arm and a diode lower arm connected in series in the same direction. The other end of each current-carrying branch is correspondingly connected to the midpoint of each commutation branch to form a port; the breaking branch includes a unidirectional breaking switch and a non-linear resistor connected in parallel. The breaking branch and the commutation branch are connected in parallel to form a first common bus and a second common bus.

The invention provides a current breaking device and a control method thereof. The current breaking device comprises a main branch circuit, the main branch circuit comprises at least two groups of through-flow units which are connected in series, and each through-flow unit comprises a first mechanical switch and a first non-linear resistor which are connected in parallel; the transfer branch circuit is connected with the main branch circuit in parallel, and the transfer branch circuit comprises an oscillation capacitor; the isolation branch circuit is connected with the main branch circuit in series, and the isolation branch circuit comprises a second mechanical switch; the oscillation inductor and the power electronic unit are connected in series in a parallel loop of the main branch and the transfer branch, the oscillation inductor is connected in series in the main branch or the transfer branch, and the power electronic unit is connected in series in the main branch or the transfer branch.

The present invention provides a lightning arrester with a fixed series gap, comprising a first conductive block (10), a first electrode (21), an insulating member (31), a second conductive block (32), a second electrode (22), a nonlinear resistor (33), an end conductor (40), a plurality of support rods (50) and an insulating jacket (60). The first conductive block, the insulating member, the second conductive block, the nonlinear resistor and the end conductor are stacked in sequence along an assembly direction (A). The support rod extends along the assembly direction. One end of the support rod is connected to the first conductive block, and the other end is connected to the end conductor. A plurality of support rods are arranged around the insulating member, the second conductive block and the nonlinear resistor in a circumferential direction perpendicular to the assembly direction. The insulating jacket is wrapped around the circumferential outer side of the first conductive block, the insulating member, the second conductive block, the nonlinear resistor and the end conductor. The support rod is embedded in the insulating jacket. The lightning arrester with a fixed series gap has a high structural strength.

The present application provides a current breaking device and a control method therefor. The current breaking device comprises: a main branch, wherein the main branch comprises at least two current-conducting units connected in series, and each current-conducting unit comprises a first mechanical switch and a first nonlinear resistor are connected in parallel; a transfer branch, wherein the transfer branch is connected in parallel to the main branch, and the transfer branch comprises an oscillation capacitor; an isolation branch, wherein the isolation branch is connected to the main branch in series, and the isolation branch comprises a second mechanical switch; and an oscillation inductor and a power electronics unit, connected in series in a parallel loop of the main branch and the transfer branch, wherein the oscillation inductor is connected in series within the main branch or within the transfer branch, and the power electronics unit is connected in series within the main branch or within the transfer branch.

The invention discloses a composite film, a photoelectric device and a display device.The composite film comprises an electronic function layer and a composite function layer which are stacked, the composite function layer comprises a first function unit and a second function unit, and the first function unit and the second function unit are arranged on one side of the electronic function layer side by side; the thickness of the first functional unit is equal to that of the second functional unit, and the first functional unit comprises an NPN layer and a first nonlinear resistance layer which are stacked; and the second functional unit comprises a PNP layer and a second nonlinear resistance layer which are stacked. The invention aims to solve the problem that the stability of the electron transmission characteristic of the existing electron transmission film is poor.

An electrical surge suppressor includes a capacitive component incorporated inside a housing and immersed in, or filled with, oil; a linear resistive component; and a non-linear resistive component connected or connectable in parallel with the linear resistive component. The surge suppressor has a monitoring circuit configured to measure at least one operating characteristic of the linear and / or non-linear resistive and capacitive components and an auxiliary power supply integrated within the capacitive component to provide an auxiliary supply voltage to the monitoring circuit. The capacitive component is connected in series with the parallel connected linear and non-linear resistive components and connected to a phase contact; the phase contact is connected or connectable to the load circuit; and the capacitive component is configured to provide a high impedance connection to the linear and non-linear resistive components, at nominal power supply frequencies and, during switching transients, to provide a low impedance to a combined resistive impedance of the linear and non-linear resistive components effectively into the load circuit.

This utility model relates to a surge arrester that is easy to disassemble, comprising several surge arrester units, with adjacent surge arrester units detachably connected via a threaded structure. Each surge arrester unit includes: a connecting cylinder with a silicone rubber shed on its outer side; a nonlinear resistor element detachably installed inside the connecting cylinder; the uppermost and lowermost surge arrester units are respectively detachably connected to an upper connecting seat and a lower connecting seat; a mating part is integrally formed at the lower end of the connecting cylinder, and the mating part has external threads on its outer side; the inner walls of adjacent connecting cylinders have internal threads adapted to the external threads, achieving detachable connection through thread engagement. This easily disassembled surge arrester, due to its detachable structural design, allows for replacement of only the damaged component or the corresponding surge arrester unit when components such as the silicone rubber shed or the nonlinear resistor element are damaged, without replacing the entire surge arrester, significantly reducing maintenance costs and material waste.

The invention belongs to the field of power system overvoltage protectors, and discloses a three-phase combined overvoltage protector which comprises a plurality of phase units and a plurality of ground units, each phase unit and each ground unit comprise a nonlinear resistor and a discharge gap which are connected in series, and a lead is arranged at one end, away from the nonlinear resistor, of each discharge gap; the discharge gap comprises a second metal sheet connected with the non-linear resistor, and a second electrode, an electrode support body and a gasket are sequentially arranged at one end, far away from the non-linear resistor, of the second metal sheet; an insulating cylinder is arranged in the electrode supporting body, a first electrode is arranged at one end, close to the gasket, of the insulating cylinder and located outside the electrode supporting body, a first metal sheet and a net-shaped metal sheet are sequentially arranged at one end, away from the gasket, of the first electrode, and a spring is arranged between the first metal sheet and the net-shaped metal sheet. According to the invention, accidents caused by overheat of the overvoltage protector due to overhigh continuous discharge temperature can be prevented.

The present application provides a driver amplifier circuit. The driver amplifier circuit includes a nonlinear differential amplifier and a nonlinear resistor connected across the output terminals of the differential amplifier. The nonlinear resistor has a resistance value that increases as the magnitude of the differential voltage across the nonlinear resistor increases. A transmitter may include the driver amplifier.

The application discloses a modeling method for calculating an arc reignition model during a pantograph lowering process of a motor train unit based on PSCAD, considers an overvoltage factor, finds that the arc generated during the pantograph lowering process can cause a high overvoltage result, and establishes a simulation model for the situation. The simulation model modeling method proposed in the scheme is different from the prior art, and aims to propose a modeling method for simulating the arc reignition development and change process and the overvoltage evolution process during the pantograph lowering process of the motor train unit. The main function is to judge the arc reignition extinction condition in real time and calculate the arc resistance in real time according to the pantograph-catenary distance change and the voltage difference change on both sides of the pantograph, to assign the equivalent value of the calculated arc resistance RDF in the variable RLC module, and finally to simulate the pantograph-catenary arc development and change process and the overvoltage evolution process during the pantograph lowering process in the form of a series nonlinear resistance in the circuit.

The invention provides a three-dimensional nonlinear magnetic material equivalent circuit model and a test method, and is applied to the technical field of power electronics. According to the model, a current source module applies bias current and excitation current to a nonlinear coupling packaging module; a plurality of node ports of the nonlinear coupling packaging module are connected with physical coupling nodes of a plurality of nonlinear coupling devices; the mapping sub-module maps the plurality of physical coupling nodes and the plurality of nonlinear coupling devices, constructs an analog nonlinear coupling circuit according to a connection coupling relation between the linear damping module and the plurality of nonlinear coupling devices, and responds to an applied bias current and an excitation current, so that the nonlinear coupling circuit is simulated. The analog nonlinear inductance unit is coupled to generate an analog induced voltage, and the analog induced voltage is applied to the linear damping module and other analog nonlinear devices through a plurality of node ports to reproduce a magnetic domain rotation coupling effect and an anisotropic hysteresis effect; the linear damping module responds to the analog induced voltage and reproduces a damping effect in combination with the analog nonlinear resistor unit.

The invention provides a zero-loss current limiting device based on an artificial zero-crossing technology and a device monitoring and maintenance method, and relates to a transformer fault current limiting technology, the device comprises a main switch branch, an energy absorption branch and an artificial zero-crossing branch; the main switch branch comprises a vacuum fast switch, the vacuum fast switch is connected in series between a bus of the power distribution system and the input end of the main transformer, and the vacuum fast switch is connected in parallel with a current limiting reactor; a modulation inductor is connected in series between the main switch branch and the artificial zero-crossing branch, and the energy absorption branch is connected in parallel to the artificial zero-crossing branch; the energy absorption branch comprises a plurality of zinc oxide resistors, and a nonlinear resistor module is formed by the plurality of zinc oxide resistors; the artificial zero-crossing branch comprises an energy storage unit and a trigger switch, the energy storage unit at least comprises a zero-crossing energy storage capacitor, and the zero-crossing energy storage capacitor and the trigger switch are connected in series. The zero-crossing energy storage capacitor releases electric energy to artificially produce a zero-crossing point, so that rapid opening of the vacuum rapid switch is facilitated, and short-circuit fault current limiting is realized.

The invention discloses a self-breakdown gas switch control type low-residual-voltage lightning arrester which comprises a zinc oxide lightning arrester with a nonlinear resistance characteristic, an assembly formed by connecting a linear resistor and a linear capacitor in series and in parallel, and a self-breakdown gas switch connected with the assembly in parallel. One end of the zinc oxide arrester is connected in series with one end of the linear assembly, the other end of the zinc oxide arrester is connected with high voltage, the other end of the linear assembly is grounded, and the self-breakdown gas switch is connected in parallel with two ends of the linear assembly. According to the invention, the low charge rate of the lightning arrester under the normal working condition can be ensured, so that the long-term operation life of the lightning arrester is prolonged, the reliability of the lightning arrester is improved, and the gas switch can be self-punctured more reliably under the action of the overvoltage, so that the low residual voltage is obtained, and the deep suppression of the overvoltage of a power system is realized.

The utility model discloses a kind of harmonic absorbers for electromagnetic voltage transformer, including protective cover and nonlinear resistance sheet, nonlinear resistance sheet is fixed in protective cover, further include ground side conducting plate, high voltage side conducting plate and pressing plate, the protective cover is made of metal, and one side has opening, nonlinear resistance sheet is cuboid structure, high voltage side conducting plate and ground side conducting plate are respectively located nonlinear resistance sheet upper portion and lower portion, and are fixed in protective cover by pressing plate, high voltage wiring stud is equipped on pressing plate, ground stud is equipped on protective cover. The utility model designs nonlinear resistance sheet as cuboid, greatly reduce space occupancy, adapt to outdoor narrow installation environment, and reduce contact resistance by aluminum plate conducting plate, reduce additional heating, ground stud is equipped on protective cover, it is convenient to ground directly, with the characteristics of simple structure, easy to install, safe and reliable.

A driver amplifier circuit includes a non-linear differential amplifier and a non-linear resistor connected across output terminals of the differential amplifier. The non-linear resistor has a resistance value that increases as an amplitude of a differential voltage across the non-linear resistor increases.

The utility model belongs to the technical field of power and electric appliances, and discloses a surge suppression circuit breaker, which comprises a phase controller and a first phase circuit breaking mechanism, the first phase circuit breaking mechanism comprises a first operating mechanism, a first sleeve, a first contact spring, a first insulating pull rod, a first vacuum arc-extinguishing chamber, a first upper wire outlet seat, a first lower wire outlet seat, a first nonlinear resistor and a first Spark closing device; the first sleeve is divided into a first switch chamber and a first action chamber from top to bottom. The first vacuum arc-extinguishing chamber and the first nonlinear resistor are installed in the first switch chamber. The first contact spring and the first insulating pull rod are arranged in the first action chamber; and the phase controller is used for receiving phase information of external power and controlling the first Spark closing device to perform spark closing according to the phase information. According to the utility model, the control of the Spark closing device is realized through the phase controller, so that spark closing is realized through the Spark closing device, the surge is reduced, and the reliability of the whole circuit breaker is improved.

Provided is a lightning arrester operation detector capable of exhibiting required withstand voltage performance without increasing a physical size. The lightning arrester operation detector according to an embodiment is provided with: a nonlinear resistance unit capable of generating an inter-terminal voltage of a prescribed voltage or less by receiving a discharge current of a lightning arrester; a protection resistor for limiting a current flowing by the inter-terminal voltage; a light emission unit for generating, on the basis of a current flowing through the protection resistor, an optical signal corresponding to said current; and a phototransistor unit for generating a pulse signal corresponding to the operation of the lightning arrester on the basis of the optical signal.

The present application provides a current shutoff device and a control method thereof. The current shutoff device includes: a first flow branch, including at least two groups of mechanical switches and nonlinear resistors connected in parallel and connected in series; a second flow branch; a first transfer branch; a second transfer branch; an energy-consuming branch, including a nonlinear resistor, or at least two nonlinear resistors connected in series, wherein the first flow branch is connected in series with the first transfer branch to form a first bridge arm, the second flow branch is connected in series with the energy-consuming branch to form a second bridge arm, and the first bridge arm, the second bridge arm, and the second transfer branch are connected in parallel; a reactor unit and a self-excitation module unit, connected in series in a parallel loop of the first bridge arm and the second transfer branch, the reactor unit being connected in series inside the first flow branch, inside the first transfer branch, or inside the second transfer branch, and the self-excitation module unit being connected in series inside the first flow branch, inside the first transfer branch, or inside the second transfer branch.

The invention discloses an anti-pollution flashover porcelain insulator with a nonlinear resistance coating and a preparation method thereof, and relates to the technical field of insulators, the insulator comprises a steel cap, a steel foot, a porcelain insulator matrix and a nonlinear resistance coating covering the surface of the matrix. The coating is composed of an inner functional layer attached to a base body and an outer protective layer covering the inner functional layer, and a chemical cross-linked gradient transition structure is formed at the interface of the two layers through a wet-on-wet process. The inner functional layer comprises a nonlinear resistance filler and a heat-conducting insulating filler, and Joule heat generated by nonlinear work is efficiently conducted to the porcelain insulator matrix for dissipation by using a constructed phonon heat-conducting network; and thermochromic microcapsules are dispersed in the outer protective layer and are used for indicating the local overheating state of the inner layer. According to the invention, the heat sink effect of the porcelain body and the heat-conducting network are utilized to dissipate heat synergistically, so that the problem of heat collapse of the traditional nonlinear coating is effectively solved, and meanwhile, the overheating of the insulator can be visualized.