740results about "Base element modifications" patented technology

The invention relates to the technical field of capacitance compensation matching, in particular to a dynamic tuning capacitance compensation matching method and system for a transformer simulation test. The method comprises the following steps: before a test is started, establishing a digital twin model based on parameters of a transformer to be tested, identifying a systematic measurement error source caused by inherent characteristics of a system through simulation, and generating error source correction parameters; in the test period, voltage and current original waveforms containing electrical disturbance in a test loop are obtained in real time through high-frequency synchronous sampling; a mixed disturbance separation model is used, the collected original waveform and the generated error source correction parameters are used as input, and random measurement disturbance components caused by load dynamic changes are calculated and separated in real time; and based on the separated disturbance component, driving a dynamic capacitance compensation module to generate a compensatory electric signal which is equal to the disturbance component in size and opposite to the disturbance component in phase, and injecting the compensatory electric signal into a test loop so as to realize active disturbance cancellation. According to the invention, the measurement precision of the transformer simulation test can be improved.

The invention discloses a target impedance simulation circuit, an element parameter determination method and an impedance simulation jig. The target impedance analog circuit comprises a plurality of RC modules, wherein each RC module comprises a resistor unit and a capacitor unit which are connected in series; part or all of the RC modules are connected in parallel to simulate impedance data of a to-be-measured target. According to the technical scheme provided by the invention, the RC module is adopted to simulate the impedance value, so that the impedance behavior characteristics of the specified object under different frequencies can be accurately simulated, and the device can be flexibly and repeatedly used.

The invention provides an automatic testing device for an electrical interface of hardware equipment, which comprises a core control unit, an AT32F415CBT7 single chip microcomputer, an RS232 serial port testing interface and an RS485 serial port testing interface, the test unit comprises eight paths of optical coupling isolation switching value input / output interfaces, a test module power supply input interface, a 24V power supply input interface of equipment to be tested, a state indication LED module and a vacancy detection module which are respectively used for host communication and equipment test, and a travel switch is adopted to detect the occupation state of the test unit, wherein the 24V power supply input interface of the equipment to be tested is powered by an ejector pin. According to the invention, the efficiency and accuracy of hardware equipment interface function testing can be improved, the labor cost is reduced, and batch detection requirements are met.

The invention relates to a current measuring apparatus for redundant measurement of an electric current (I) with a low-resistance current measuring resistor (1) for current measurement according to the four-lead technique and with a magnetic field sensor (14). The invention provides that the electric current (I) to be measured in the current measuring apparatus is divided into a main current path with a main current (I1) and a secondary current path with a secondary current (I2), the main current path and the secondary current path together forming a parallel circuit. The low-resistance current measuring resistor (1) is arranged in the main current path and has the main current (I1) flowing through it, while the magnetic field sensor (14) is arranged in the secondary current path and measures the secondary current (I2).

The invention relates to a Hall thruster discharge disturbance acquisition device and a Hall thruster discharge disturbance acquisition method, which are used for solving the technical problems of relatively low accuracy and reliability of an acquisition result of a Hall thruster discharge disturbance acquisition device in the prior art. According to the Hall thruster discharge disturbance acquisition device provided by the invention, the oscilloscope is used for measuring voltage and current changes of anode and cathode ignition, when the changes exceed a preset value, an acquisition triggering signal is sent to the high-speed camera while electric signal acquisition is automatically triggered, and the high-speed camera synchronously acquires an optical signal; and dual acquisition of photoelectric signals is realized.

The invention discloses a method for monitoring the insulation state of a stator winding of an injection unit based on neutral point harmonic frequency sweeping. The invention provides an active online monitoring method based on harmonic injection for stator winding insulation of a full-power variable-speed pumped storage unit. A common-mode loop is constructed for a motor stator winding of a network side transformer neutral point ungrounded system through a motor neutral point grounded transformer, and therefore online monitoring of the insulation state of a motor stator is achieved. In order to solve the measurement problem of the full-power variable-speed pumped storage unit under the large-current working condition, a neutral point outgoing line current detection technology is adopted. A machine end large current interference area is avoided, monitoring is carried out on the primary side of the grounding transformer, transmission errors are avoided, and the measurement precision and reliability of insulation monitoring signals are remarkably improved. According to the invention, harmonic injection is carried out by avoiding an inherent common-mode component of a unit, a monitorable leakage current signal is enhanced, and the accuracy of insulation equivalent capacitance calculation is ensured.

The invention belongs to the technical field of aerospace, and discloses an aviation electrical system insulation detection device which comprises a shell and an overall frame serving as the insulation detection device. The display screen is used for displaying measurement data in real time; the function key group integrates the functions of measurement mode switching, data retention and insulation test starting; according to the conversion assembly, through the linkage design of the rotating disc and the rotating switch, the problem that functions cannot be switched when the two hands of a traditional insulation detection device are occupied is thoroughly solved, a worker only needs to rotate the rotating disc with the hand of supporting equipment, the rotating switch can be driven through the driving mechanism, switching of insulation test voltage gears is completed with one hand, and the working efficiency is improved. Compared with a traditional device which needs to frequently put down a connecting line and manually rotate a switch, the design simplifies the operation steps from three steps to one step, shortens the single function switching time, and remarkably improves the efficiency and safety of high-altitude operation or narrow space detection.

The invention discloses a formation and capacity grading parallel detection system based on a high-voltage direct-current bus. A press device comprises a direct-current switch and at least one set of pull-out type charging and discharging probe module. And the input end of the direct-current switch is connected with the output end of the PCS equipment. Each charging and discharging probe module adopts a pull-out structure and comprises a mechanical frame, and a high-voltage direct-current bus, a bidirectional conversion module and a probe assembly which are integrally mounted in the mechanical frame; the high-voltage direct-current bus input end is connected with the direct-current switch output end; the bidirectional conversion module comprises two stages of conversion units; the first conversion unit is used for reducing the first voltage of the high-voltage direct-current bus into the second voltage or reversely increasing the voltage; the second conversion unit reduces the second voltage to the voltage required by charging and discharging of the battery or boosts the second voltage; the probe assembly is connected to the output end of the second conversion unit. The system is compact in structure, high in charging and discharging efficiency and convenient to maintain, and cables are saved.

Systems and Methods for capacitance testing of a unit under test with parasitic capacitance directed to a guard rail. The system includes test points, wherein the plurality of test points are divided into at least two groups; a stimulus source; a first group guard relay electrically connected to each of the test points in a first; a second group guard relay electrically connected to each of the test points in a second; a guard rail coupled to the first group guard relay and the second group guard relay; a first group return relay electrically connected to each of the test points in a first group; a second group return relay electrically connected to each of the test points in a second group; a current measurement rail coupled to the first group return relay and the second group return relay; a current meter coupled to the measurement rail; and a controller.

According to the radio frequency device strong electromagnetic pulse damage on-line monitoring method and system, the incident power, the output power and the reflection power of the tested radio frequency device are monitored in real time, then whether the tested radio frequency device is damaged or not is judged through comprehensive comparison and analysis, and the function of monitoring the state of the tested radio frequency device on line in real time is achieved. The device is used for monitoring the damage state of the radio frequency device under the strong electromagnetic pulse injection test in real time, the test efficiency is improved, the damage probability to the strong electromagnetic pulse injection source after the radio frequency device is damaged is reduced, and the test range of a traditional off-line measurement method of the test is expanded. The device is used for on-line damage monitoring during the strong electromagnetic pulse injection test of the radio frequency device, the test efficiency can be improved, test equipment can be protected, the defects of traditional off-line detection can be overcome, and the device has important significance in carrying out the strong electromagnetic pulse injection effect test of the radio frequency device and obtaining the damage threshold value of the radio frequency device.

The invention relates to the technical field of charge and discharge detection, and discloses a multichannel EIS charge and discharge in-situ test system and method, and the system comprises a DC charge and discharge module which is used for carrying out the constant-current, constant-voltage or cyclic charge and discharge test of a battery; the alternating current impedance test module is connected in parallel with the direct current charging and discharging module and is used for applying an alternating current disturbance signal to the battery and collecting impedance response in the charging and discharging process; and the unified clock module is used for providing a synchronous triggering reference signal for the direct current charging and discharging module and the alternating current impedance test module. The direct current charging and discharging module and the alternating current impedance test module are designed to be of a parallel connection normally-connected structure, no relay switching is needed, continuous and uninterrupted online EIS test in the charging and discharging process is achieved, contact resistance drift and transient errors caused by physical circuit switching in a traditional scheme are effectively avoided, and the reliability of the EIS test is improved. And the stability and repeatability of the test are obviously improved.

The invention relates to a program-controlled resistor card and a program-controlled resistor smooth control method and device thereof. The method comprises the following steps: acquiring a resistor card code combination corresponding to a current resistance value and a target resistance value; a difference mask is calculated through an XOR operation, and a relay set needing to be changed is identified; on the basis of a greedy algorithm strategy, a relay enabling the instantaneous resistance value to be closest to a target value is selected from the difference mask identification set in a successive single-step switching mode for operation; iteratively executing switching and state updating until the difference mask is zero; and finally outputting a switching completion signal. The device comprises a state acquisition module, a difference analysis module, a switching decision module and a driving execution module, realizes smooth transition in a resistance change process through ordered single-step relay switching control, effectively avoids extreme states such as an open circuit or a short circuit, remarkably improves switching precision and system reliability, and is suitable for the fields of precision test measurement and automatic control.

The invention belongs to the technical field of nuclear power, and particularly relates to a ground capacitance measurement method based on series capacitance and high-frequency signal injection. In order to solve the problem that a traditional signal injection method cannot accurately calculate the ground capacitance level of a power distribution network, the invention provides a ground capacitance measurement method based on a series capacitor and high-frequency signal injection. The leakage inductance of the voltage transformer is accurately measured by injecting the high-frequency signal, so that a resonance point is convenient to find during frequency sweeping, and the resonance point measured during frequency sweeping is more accurate.

The invention relates to an intelligent testing device for a repeating high-power intermediate relay, which comprises a programmable direct-current excitation power supply module for providing starting voltage for the intermediate relay, and is characterized in that the intermediate relay is respectively connected with a high-precision power measurement module and a high-speed action time acquisition module; the high-precision power measurement module and the high-speed action time acquisition module are both connected with the intelligent criterion analysis module, and the intelligent criterion analysis module is connected with the man-machine interaction and communication module. The intelligent testing device for the intermediate relay is compact in structure, convenient to use and accurate in measurement, has intelligent analysis capability, supports various relay brands and models, is compatible with a 220V / 110V system, has good universality and expansibility, can be widely applied to occasions such as acceptance inspection, field maintenance and troubleshooting of a relay protection device, and has wide application prospects. Therefore, the reliability and safety of the operation of the power equipment are improved.

The invention discloses a fault current calculation method and system for a high-voltage alternating-current submarine cable grounding system and a storage medium, and the method comprises the following steps: enabling a power supply device and an electric device to be equivalent to an impedance and series voltage source combination and a load impedance based on the Thevenin equivalence theorem; in combination with the double-end grounding characteristic, a submarine cable loop is equivalent according to a pi type, and a three-phase equivalent circuit is constructed; determining a fault phase, and dividing the submarine cable as a left side and a right side by a fault point; a voltage loop equation is listed based on the Kirchhoff theorem, and a matrix recursion rule is deduced in combination with a double-side elimination principle. And establishing an analytic relationship between the main sections of the submarine cables at the power side and the short-circuit side and the fault circulating current according to a recursion rule. And with a fault point current equation as a boundary condition, left sheath fault circulation distribution is solved simultaneously. And repeating the steps on the right side to obtain right side distribution so as to obtain fault phase whole-line distribution. According to the method, the circulation distribution can be accurately calculated, the fault analysis accuracy and efficiency are improved, and support is provided for submarine cable operation and maintenance and the like.

The invention relates to a development type single-phase earth fault real-model test device and a control method, the development type single-phase earth fault real-model test device is connected in a whole power grid and comprises a fault intelligent generation module, and the fault intelligent generation module comprises a dynamic resistance simulation unit and an intelligent switching control system. And the intelligent switching control system is used for controlling the access resistance value and the access time of the resistor in the dynamic resistance simulation unit. The dynamic resistance simulation unit structure is of a three-level resistance topology and is combined with a mixed switching matrix of a vacuum relay and a solid-state relay. The intelligent switching control system is used for realizing the switching of the resistor at a current zero crossing point, the intelligent switching control system comprises a low-power-consumption control circuit and a signal acquisition circuit, the structure is matched with the control method, the continuous or step dynamic change of the grounding resistor can be accurately simulated, the problem of transient impact in the resistor switching process is solved, and the stability of the grounding resistor is improved. And a standardized and quantifiable test platform is provided for performance assessment of power distribution network fault handling equipment.

The invention provides a multichannel platinum thermal resistor program control simulation card and method, the multichannel platinum thermal resistor program control simulation card comprises a resistor gating array, a relay driving array, a microcontroller module, a communication interface module and a power supply module, and the method comprises the following steps: inputting a temperature value in an upper computer; the upper computer carries out temperature-resistance value conversion; the upper computer sets resistance precision; the upper computer packages the resistance value data into a data packet according to a communication protocol, and the data packet is sent to a microcontroller of the lower computer after CRC verification; the microcontroller receives the data packet, analyzes the data packet according to a communication protocol after performing CRC (Cyclic Redundancy Check), and obtains resistance value data; the microcontroller performs'resistance value-I / O state 'conversion; the microcontroller sets an I / O state. The method has the beneficial effects that the integration and automation levels of test equipment are remarkably improved, and the test failure risk caused by the problems of instrument consistency and the like is reduced.

The invention discloses an efficient energy storage test system and method based on multiple modes. Two energy storage converters, two battery cabins and a transformer are included. A power grid connection circuit comprises a breaking switch. The energy management system communicates with the energy storage converter, and controls and switches a power supply mode, a drag test mode and a peak clipping and valley filling mode; the two energy storage converters are dragged oppositely to realize internal energy circulation, so that expensive high-power external load equipment is omitted, the energy utilization rate is improved, and waste is avoided; the system integrates a plurality of modes such as off-grid / grid-connected twin trawling test, electricity supplement and peak load shifting and can be seamlessly switched, so that the test requirements can be met, economic benefits can be brought to factories, and the equipment utilization rate and the investment return can be improved; the grid-connected point is provided with an anti-countercurrent device to prevent reverse power transmission to the power grid, thereby solving the potential safety hazard of grid-connected test and ensuring stable operation of the power grid; a single-cabin single-branch structural design is adopted, the system architecture is clear, the layout is compact, maintenance and expansion are convenient, and the system is suitable for limited deployment space.

The invention, which relates to the technical field of phased-array antenna testing, discloses an automatic phased-array testing system comprising a vector network analysis module, an antenna horn and servo control module, a phased-array antenna module, a testing tool module and an upper computer control module. The invention also discloses a phased array automatic test method. The method comprises the following steps: preparing before testing; configuring test parameters; executing an automatic test; processing and storing test data; and finishing the test and resetting the equipment. Full-process automatic testing is achieved through the upper computer automation unit, traditional testing time is shortened, large-scale phased array batch testing is adapted, personal errors are eliminated through the testing tool, the vector network module and the servo module, data credibility is improved, operation is simplified, data are automatically stored, a report is generated, modular design is adapted to multiple types of phased arrays, and testing efficiency is improved. And the cost is reduced, the application is wide, and better use prospects are brought.

The invention discloses a wide-range switch tube leakage current detection method and system, and relates to the technical field of semiconductor device detection, and the method comprises the steps: connecting a to-be-detected NMOS switch tube with a trans-impedance amplifier, and collecting the drain current; the trans-impedance amplifier converts drain current into an output voltage signal V. The switchable feedback resistor at least comprises two feedback branches corresponding to different ranges. When it is detected that the output voltage approaches a negative output saturation threshold, a corresponding gain range is switched; before each measurement period, an analog-to-digital converter is grounded through an analog switch, system offset voltage is sampled, and a digital compensation value of switch tube leakage current is calculated and compensated; rC low-pass filtering and software notch filtering are carried out on the compensated voltage signal, and then sampling is carried out; and comparing the sampling result with a preset threshold value, and outputting a leakage current detection result. According to the invention, the accuracy of the measurement result of the drain current of the NMOS transistor is improved, and the reliability of device performance evaluation is guaranteed.

The invention discloses a double-range current measurement system based on a solid-state relay, and relates to the technical field of current measurement. The system comprises a closed-loop Hall current sensor, a first shunt resistor, a second shunt resistor, a solid state relay (SSR), a Hall conditioning IC and an external controller. Two shunt resistors with different resistance values are dynamically switched through a solid-state relay, and compatibility of low-current high-precision measurement and high-current wide-range measurement is achieved. The method solves the problems that the precision and range of an existing single-range sensor are difficult to consider, double sensors are high in cost, mechanical relays have defects and the like, has the advantages of low cost, high reliability, good measurement precision and the like, and is suitable for wide-dynamic-range current measurement scenes such as an energy storage system and the like.

The invention relates to an electrical performance test system, in particular to an electromagnetic valve electrical performance test system. The equipment main control unit comprises a main control computer, and a display and a communication bus module which are connected with the main control computer; the communication bus module comprises an RS232 interface module and a network communication interface module; the test unit comprises a coil resistance test unit, an electrical parameter test unit and a plurality of voltage and current detection units which are connected with the network communication interface module, and a test circuit switching module which is connected with the RS232 interface module and the equipment main control unit; the coil resistance test unit and the electrical parameter test unit are connected with the test circuit switching module. And the voltage and current detection unit and the test circuit switching module are connected with the plurality of electromagnetic valves. Compared with the existing test equipment, different test equipment does not need to be replaced according to different test items, so that the test efficiency is improved, and the labor intensity of workers is reduced.

The invention belongs to the technical field of smart home, and particularly discloses a non-intrusive household electrical appliance identification and monitoring method and system, and the method comprises the steps: collecting an output current signal of a total patch board in real time through a current collection device disposed on a power line of the total patch board, and converting the output current signal into a discrete digital signal; dividing the discretized digital signal into a plurality of time windows; calculating a maximum adjacent difference peak value for the discrete signals in each time window; extracting transient auxiliary features and steady auxiliary features in each time window; and inputting the frequency domain harmonic features, the maximum adjacent difference peak value, the transient auxiliary features and the steady-state auxiliary features extracted in all the time windows into a trained electric appliance identification model to obtain the working state of each household electrical appliance on the total patch board. The method can focus on the waveform characteristics at the critical moment, obtains the fingerprints of transient operation of the electric appliances, and can accurately distinguish the electric appliances with similar steady-state power but different starting characteristics.

The invention discloses a comprehensive diagnosis method for clamping, separating and clamping faults of a contactor for a traction converter, is used for solving the technical problem that faults are likely to be misreported in the prior art, and belongs to the technical field of converter fault diagnosis. The detection loop adopts a normally-open auxiliary switch parallel connection mode to feed back the state of the contactor, so that the false alarm rate of the contactor clamping failure can be reduced; the detection loop adopts a normally-open auxiliary switch series connection mode to feed back the contactor state, so that the clamping fault false alarm rate of the contactor can be reduced; the control unit adds a reset condition control strategy to reduce the fault false alarm rate; the control strategy that the control unit detects the state of the auxiliary switch of the contactor and detects whether the voltage and current values in the loop meet the threshold value can reduce the fault false alarm rate. The accuracy of fault diagnosis of the contactor for the traction converter is improved, the fault level is reduced to the maximum extent, meanwhile, the comprehensive diagnosis method is simple in judgment logic, the occupancy rate of computing resources of a control unit is low, and the overall performance of a traction system and the operation efficiency of a locomotive are improved.

The present disclosure provides an operational amplifier current noise testing device and method, relates to the technical field of operational amplifier noise testing, aims to find the position of the introduced pole by testing the input end capacitor, and compensate the influence of the introduced pole of the sampling resistance and stray capacitor through the mathematical correction method, so as to accurately measure the current noise characteristics of the operational amplifier. The device comprises: a device under test module comprising an operational amplifier to be tested and a sampling resistor, wherein the sampling resistor is used to convert the current noise at the input end of the operational amplifier into voltage noise; an auxiliary amplifier module for further amplifying the voltage noise; a capacitor testing module for testing the total input capacitance of the device under test module, the total input capacitance comprising the input capacitance of the operational amplifier itself and the stray capacitance introduced by the system; wherein after the total input capacitance is obtained, the attenuation frequency of the noise signal is corrected according to the total input capacitance to obtain the corrected noise signal.

This invention discloses a short-circuit and resistance detection device, comprising a circuit board assembly electrically connected to a rectangular connector. The circuit board assembly includes an MCU, which is electrically connected to a power supply unit, a switching unit, and a detection unit. The switching unit includes a short-circuit detection switch unit, a short-circuit detection interrupt switch unit, a resistance detection switch unit, and a resistance detection interrupt switch unit. The detection unit includes a short-circuit detection unit and a resistance detection unit. The MCU includes several PA pins and several PC pins. The PA pins include PA0 pins and PAn pins, and the PC pins include PCi pins; n=1…n, i=0…i. This invention can simultaneously detect whether any signal is short-circuited to multiple other signals, can detect the resistance of multiple products, reduces personnel requirements, improves product detection accuracy, and shortens detection time. This invention also discloses a detection method for the short-circuit and resistance detection device.

Apparatus is described including a DC electrical meter (62). The DC electrical meter (62) includes a current sensor (1), or the DC electrical meter (62) is connected to the current sensor (1). The current sensor (1) includes a busbar connector (2) including a first part (3) connected to a third part (4) via a second part (5). A material forming the second part (5) has a temperature coefficient of electrical resistance which is less than a temperature coefficient of electrical resistance of materials forming the first (3) and third (4) parts respectively. The second part (5) includes a main body (6) integrally formed with first (7a) and second (7b) connecting members. Each connecting member (7a, 7b) has a proximal end (8a, 8b) where it meets the main body (6) and a distal end (9a, 9b) electrically coupled to a respective conductive element (10a, 10b) supported on a substrate (11) and coupled to circuitry (12) configured to measure a voltage between the first (7a) and second (7b) connecting members. The current sensor (1) is configured such that when a first temperature difference (δT1) exists between the respective proximal ends (8a, 8b) of the first (7a) and second (7b) connecting members, a second temperature difference (δT2) between the respective distal ends (9a, 9b) is less than or equal to 50% of the first temperature difference (δT1).

The present application relates to the technical field of circuit, in particular to a non-mechanical touch button detection circuit and method.The non-mechanical touch button detection circuit provided by the present application comprises a plurality of external IO channels for connecting external sensors, a detection circuit main body comprising a plurality of function detection channels, at least including a capacitance detection channel and a pressure detection channel, and a programmable analog array switch configured to selectively switch any one or more of the external IO channels to the corresponding one or more function detection channels based on different detection modes, to realize multiplexing or combination of capacitance detection function, pressure detection function or capacitance and pressure fusion detection function.The present application realizes deep fusion and flexible reconstruction of capacitance detection and pressure detection through the programmable analog array switch, realizes automatic adaptation and time division multiplexing of a single chip to multiple detection modes, and improves the versatility, reliability and environmental adaptability of the touch button.

The application discloses a kind of digital primary-secondary fusion pole-mounted circuit breaker and its travelling wave ranging time method. The circuit breaker includes feeder terminal and transformer digitizing unit, the feeder terminal is connected with satellite synchronous clock, and the feeder terminal and transformer digitizing unit are connected by cable to realize the uplink communication connection from the feeder terminal to the transformer digitizing unit. In the application, the feeder terminal periodically and uniformly sends data frame to the transformer digitizing unit based on second pulse signal, the transformer digitizing unit obtains time stamp synchronized with second pulse signal based on the received data frame, and obtains travelling wave data with time stamp, thereby improving the accuracy of ranging.