19 results about "Nonlinear resistor" patented technology

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 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.

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 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 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.

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.

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.

The invention discloses a zinc oxide lightning arrester with a modular structure, and belongs to the technical field of zinc oxide lightning arresters, and the zinc oxide lightning arrester comprises a silicone rubber jacket assembly, the upper end and the lower end of the silicone rubber jacket assembly are respectively clamped with a first end cap and a second end cap; one end of the bracket is fixedly connected with the outer wall of the second end cap; the insulating sleeve part is fixedly embedded into the silicone rubber jacket assembly and is wrapped by the silicone rubber jacket assembly, an upper electrode and a lower electrode are arranged at the upper end and the lower end of an inner cavity of the insulating sleeve part respectively, and a plurality of nonlinear resistor discs are arranged between the upper electrode and the lower electrode and located in the insulating sleeve part. According to the invention, the dual maintenance convenience that the inner core of the lightning arrester can be pulled out and the shell can be split is realized, when the internal valve plate needs to be overhauled or replaced, the whole insulating sleeve part, the electrode and the valve plate can be integrally pulled out only by dismounting the end cap, the problem that the whole machine needs to be scrapped once the internal valve plate of a traditional product is aged or damped is solved, and the working efficiency is improved. And the whole life cycle operation and maintenance cost is obviously reduced.

The application discloses a self-rectifying ZnO thin film memristor and a preparation method thereof. The device resistance change layer is composed of binary metal oxide ZnO, the bottom electrode is composed of ITO, and the metal top electrode is composed of W. The ZnO thin film resistance change layer of the device is prepared by using a simple and efficient glue uniformity method process, and the top electrode of the device is designed by using a magnetron sputtering film coating technology. The application has important application potential in the high-density three-dimensional integration of the device in the aspect of the device architecture physical layer without additionally introducing a series rectifier device and a nonlinear resistor. In the aspect of the device performance, the high-density storage of the multi-resistance state of a single device storage unit can be realized by orderly regulating an applied physical field, and the self-rectifying multi-value resistance change storage has the characteristics of high stability and non-volatility, and therefore has important application prospects in the next generation of non-volatile high-density memories.

The invention relates to a holder (100) for a mobile device (200). Due to the wide variation of devices, conventional mounting devices that seek to hold many different devices have become complex and expensive. By providing rotatable edge clamps (110, 115) along with one or more serpentine extension resistances (120), a region of nonlinear resistance is provided to separate the first edge clamp (110) and the second edge clamp (115). This has the advantage of a lower rate of increase in separation resistance at greater separation distances compared to using a linear element, such as a coil spring.

The invention discloses a transient electroluminescence integrated automatic test system and method based on FPGA control, and the system comprises an FPGA module, a high-speed ADDA module, an optical detector and an upper computer, is used for carrying out the transient electroluminescence test of an LED device, obtains the actual measurement TREL data of the device through the test system, and carries out the testing of the TREL data. The method comprises the following steps: establishing a non-linear resistor element, establishing a parallel circuit of the non-linear resistor element and a parallel plate capacitor as a physical model of the LED device, obtaining a transient response current curve of the non-linear resistor element, then establishing a numerical simulation function, and performing numerical fitting by using the transient response current curve and actually measured TREL data to finally obtain a TREL curve; the time sequence precision and the test efficiency are remarkably improved, the carrier recombination kinetic parameters and the evolution law thereof in the transient process are obtained by adopting a transient current and transient electroluminescence combined analysis method, the limitation that the current dynamics is neglected in the traditional TREL curve analysis is broken through, and the TREL analysis can more accurately and comprehensively reflect the device characteristics.

The utility model discloses a non-linear resistance testing system, and relates to the technical field of resistance testing, the non-linear resistance testing system comprises a resistance measuring module and an analysis module which are connected with each other, and the resistance measuring module comprises a capacitor charging and discharging unit. The discharging control unit is selectively connected with the capacitor charging and discharging unit; the voltage stabilization output unit is connected with the discharging control unit; the capacitor charging and discharging unit is also selectively connected with the charging power supply, the voltage stabilization output unit is also connected with the resistor to be tested, and the analysis module is also connected with the resistor to be tested. The discharging control unit is used for controlling the discharging process of the capacitor charging and discharging unit, so that the capacitor charging and discharging unit discharges in a stepped characteristic mode, the synchronization time redundancy of voltage sampling and current sampling is increased, and then the accuracy of nonlinear resistance testing is improved.

The application relates to the field of electric locomotive arresters, in particular to a locomotive linear combination gap arrester and a detection method thereof. The arrester comprises a shell, the shell comprises an upper fitting, a lower flange and an insulating shell connected between the upper fitting and the lower flange, a nonlinear resistor, a linear resistor and a plurality of gap copper platforms are arranged in the insulating shell, the linear resistor is in contact and is connected in series between the plurality of gap copper platforms, so as to separate the adjacent gap copper platforms to form a breakdown gap, and the nonlinear resistor is connected in series with the gap copper platforms. The application has the effects of guaranteeing overall thermal stability, reducing residual voltage level and improving protection level.

The application belongs to the technical field of electric heating hydrate deposit development, and particularly relates to a method for constructing a hydrate-containing porous medium resistivity model considering the form of dissociation gas. The method introduces a bubble characteristic index to introduce the form of dissociation gas into resistivity calculation, quantitatively corrects the deviation of pore conduction rules caused by the evolution of the form of dissociation gas, and effectively improves the accuracy of reservoir saturation evaluation and dynamic monitoring in the process of hydrate exploitation by constructing a nonlinear resistivity model containing a correction term of the form of dissociation gas.

The present application mainly relates to a nonlinear resistive strain sensor. The nonlinear resistive strain sensor comprises an elastic substrate and conductive substances, and the conductive substances are uniformly distributed on the elastic substrate. When the elastic substrate is stretched, the length of the elastic substrate correspondingly increases, and the density of the conductive substances on the elastic substrate decreases, thereby changing the overall resistance of the nonlinear resistive strain sensor. In this way, the nonlinear resistive strain sensor of the present application has nonlinear highly-sensitive resistive strain performance.