951results about "Continuity testing" patented technology

The invention discloses a precise positioning method of an automatic transmission conductor breaking device, and relates to the technical field of line detection, and the method comprises the following steps: obtaining eddy current detection signal data of the surface of a transmission conductor; performing sliding window segmentation processing on the eddy current detection signal data, and extracting a transient impedance sequence; the transient impedance sequence is processed through a phase sensitive demodulation circuit, and impedance real part information and impedance imaginary part information are separated; impedance real part information features are extracted, impedance imaginary part information frequency domain energy is deconstructed, and an impedance track feature vector is generated; and carrying out space segmentation on the impedance track feature vector, and calculating defect position information and severity level based on the offset of the track center point. The problem that an existing wire detection technology is insufficient in automation level and difficult to meet the requirement for accurate defect positioning of an automatic wire breaking device is solved.

The invention discloses a rectifier bridge arm fault identification method and system circuit based on multi-characteristic current waveform analysis, and relates to the technical field of rectifier bridge arm fault identification, and the method comprises the steps: collecting a current signal of an AC input side of a rectifier bridge through a current sensor, and obtaining an original current time domain waveform after filtering conditioning; performing period division on the original current time domain waveform based on a voltage synchronization signal, and outputting a positive half-cycle conduction interval and a negative half-cycle conduction interval in each power frequency period; in each power frequency period, performing square integral operation on the current waveforms of the positive half-cycle conduction interval and the negative half-cycle conduction interval to obtain a positive half-cycle energy value and a negative half-cycle energy value, and calculating an energy unbalance degree; and windowing fast Fourier transform is carried out on the original current time domain waveform, amplitudes and phases of third, fifth and seventh characteristic harmonics are extracted to form a harmonic characteristic vector, the vector is matched with a pre-stored bridge arm fault harmonic fingerprint template, and the matching degree of each fault type is obtained.

The embodiment of the invention provides an electronic lead sealing strip and a detection method based on the electronic lead sealing strip, the electronic lead sealing strip comprises a shell, a first lock cylinder, a second lock cylinder, a pressure detection module and a control module, the first lock cylinder, the second lock cylinder, the pressure detection module and the control module are arranged in the shell, and the first lock cylinder and the second lock cylinder are arranged in parallel; a pressure detection module is arranged at the vertical position of the first lock cylinder, and the first lock cylinder is further connected with a connecting line. The control module is connected with the first lock cylinder, the second lock cylinder and the pressure detection module. And under the condition that the connecting wire is inserted into the second lock cylinder and is stably installed, the control module determines the connecting state of the connecting wire by judging a loop of the first lock cylinder and the second lock cylinder and / or a pressure value collected by the pressure detection module. Whether the electronic lead sealing strip is cut off or not is judged according to the detected pressure value, and the reliability of the electronic lead sealing strip is improved.

The invention relates to the technical field of fault prediction and health management, and discloses a membrane envelope wire breakage detection method, which comprises the following steps: constructing a static impedance reference model containing viscoelastic characteristics, and extracting a time constant representing the physical relaxation velocity of an insulating material; performing phase correction operation on the instruction motion attitude coordinate by using the instant motion velocity vector and the time constant to obtain an equivalent physical attitude coordinate; and querying theoretical electrical characteristic parameters in the static impedance reference model by using the equivalent physical attitude coordinates, and carrying out difference calculation on the theoretical electrical characteristic parameters and the measured values to calculate a residual error characteristic sequence so as to evaluate the health factors. And due to measurement reference deviation caused by viscoelasticity lag of the high polymer material, accurate capture and trend prediction of weak early damage signals are realized.

The invention provides a fan blade lightning protection conduction testing method and system based on machine learning, and relates to the technical field of lightning protection conduction testing, and the method comprises the steps: carrying out the current testing of a fan blade lightning protection system through a multi-channel MOS tube control circuit; performing multi-dimensional feature extraction and local feature analysis on the current response data; carrying out feature enhancement and defect identification based on the local feature sequence, and carrying out multistage clustering on an identification result; and performing global health analysis and defect traceability of lightning protection conduction performance on the fan blade lightning protection system according to a defect classification result, generating a defect attribution point location for monitoring, performing feedback optimization on a multi-channel MOS tube control circuit, and constructing a test optimization closed loop. According to the invention, the technical problem that the lightning protection conduction test efficiency is low due to the fact that the static conduction test is difficult to identify early hidden defects in the prior art is solved, the current test is carried out through the multi-channel MOS tube control circuit, and the lightning protection conduction test efficiency is improved.

The invention belongs to the technical field of new energy automobiles, and particularly relates to a new energy automobile high-voltage system safety overhaul whole-process monitoring and early warning system which comprises a vehicle end safety state sensing module, a maintenance end local electricity verification module, a whole-process state fusion decision module and a grading early warning and operation locking module. The vehicle end safety state sensing module is arranged on a new energy vehicle and is used for acquiring a multi-dimensional safety state signal of a high-voltage system and carrying out cross comparison and consistency verification on the multi-dimensional safety state signal, a residual voltage value measured by the maintenance end local electricity verification module and a voltage attenuation curve; according to the method, high-confidence judgment on the real power-off state of the high-voltage system is realized, the misjudgment risk caused by vehicle-mounted signal misinformation, communication delay or sensor failure is effectively avoided, and the accuracy and reliability of safety state confirmation before maintenance are remarkably improved.

A continuity detector for determining the continuity of a Unit Under Test (UUT). The detector comprises a housing defining an interior volume, an electronics package disposed within the interior volume defined by the housing assembly, a first test contact and a second test contact to interface with the electrical wire or harness assembly, a precision resistance standard disposed within the housing and electrically coupled to the electronics package, and a power source disposed within the housing assembly. The first test contact and the second test contact are external to the interior volume. The first test contact and the second test contact are electrically coupled to the electronics package. The electronics package comprising a resistance measurement device and a comparator circuit. The comparator circuit is configured to determine if the resistance of the UUT is greater than, less than, or equal to the resistance of the resistance standard.

The invention discloses a three-level inverter open-circuit fault diagnosis method based on fault feature vector prediction, and the method comprises the steps: reconstructing a theoretical stator current through reference current based on a motor steady-state model, and introducing an amplitude per-unit algorithm to calculate a current residual error, thereby recognizing the fault, and locking a fault phase; collecting a system state at the moment of fault triggering, deducing a modulation switch sequence in a future detection period on line by using a reference voltage vector time sequence prediction model, and generating a dynamic reference value of theoretical action times of each switch state; performing real-time statistics on the actually-measured cutoff times of the fault phase in different switch states by using an edge triggering mechanism, and constructing an actually-measured feature vector; and determining a fault device by calculating the minimum distance between the actual measurement vector and each fault modal theoretical feature. The method can effectively eliminate the influence of the rotating speed and load change of the motor on the diagnosis threshold, solves the problem that the fault features of the inner tube and the clamping diode are overlapped and are difficult to distinguish, and improves the robustness and accuracy of fault diagnosis.

This invention discloses a highly generalizable method for diagnosing open-circuit faults in multi-transistor converters of motor drive systems. This method addresses open-circuit faults in power devices caused by overcurrent surges, poor heat dissipation, and other factors, preventing damage to the motor and power grid equipment caused by output current distortion and increased torque ripple. The method analyzes the retention characteristics of the positive and negative regions of the three-phase stator current under steady-state operating conditions to construct a fault location function, and combines auxiliary variables to accurately distinguish between single-power and dual-power device open-circuit faults. This invention enables rapid location and accurate identification of complex open-circuit faults such as those in opposite phases on the same side or in opposite phases on opposite sides. It offers advantages such as high diagnostic accuracy, strong ability to distinguish mixed faults, and non-invasiveness, making it suitable for motor drive systems with high requirements for operational reliability and fault tolerance.

The invention provides an airplane radio frequency cable in-situ detection system and method.The airplane radio frequency cable in-situ detection system comprises a display control terminal, a signal generation unit, a directional coupler, a self-adaptive filtering unit, a multi-parameter analysis unit and an intelligent diagnosis unit.The display control terminal is connected with the signal generation unit and the intelligent diagnosis unit through network cables; the low delay of signal transmission between the modules is ensured; the signal generation unit, the directional coupler, the self-adaptive filtering unit and the multi-parameter analysis unit are connected through low-loss radio frequency cables, so that high fidelity in a radio frequency signal transmission process is ensured; and the multi-parameter analysis unit is connected with the intelligent diagnosis unit through a network, so that the real-time performance and stability of data transmission are ensured.

The utility model relates to an electrode inspection auxiliary device, in particular to an inspection tool for an intraoperative test electrode. An intraoperative test electrode inspection tool comprises a conductive socket, a first conductive column, a second conductive column and a conductive control assembly. And a plurality of jacks corresponding to the copper needles in the connecting joint are arranged in the conductive socket. The number of the first conductive columns is multiple, and each first conductive column is electrically connected with one jack. The number of the second conductive columns is multiple, and each second conductive column is arranged corresponding to the contact on the electrode tip of the test electrode. The conductive control assembly is electrically connected with the second conductive columns and used for controlling the second conductive columns to make contact with or be disconnected from the contacts of the electrode tips. Through the arrangement, the situation that data cannot be measured or the platinum-iridium alloy wire is broken due to the fact that the platinum-iridium alloy wire of the test electrode is too thin and too soft in an operation can be avoided. Only one person is needed for operation during measurement, manpower is saved, and the measurement efficiency is improved.

The invention relates to the technical field of locomotive line detection, in particular to a line detection system and device for a locomotive main transformer, and the system comprises a transformer which comprises an input side and an output side, the input side is used for being connected with a power supply, the output side comprises an end a and an end n, the end a is used for being connected with the end A of the main transformer, and the end n is used for being connected with the end X of the main transformer; the end a is connected with an over-current relay; the input side is connected with a conduction test loop, an operation test loop and an overload test loop; the conduction test loop is used for testing the conduction states of the main transformer, the a end and the n end; the operation test loop is used for carrying out power supply detection on the main transformer; when the transformer is in overload operation, the overcurrent relay drives the overload test loop to be conducted; therefore, through the arrangement of the conduction test loop, the operation test loop and the overload test loop, the conduction state, the power supply condition and the overload condition of the main transformer line can be rapidly detected, and cumbersome connection and disconnection operation is not needed.

The application discloses a kind of three-phase rectifier multiple switch tube open-circuit fault diagnosis methods based on voltage deviation, belong to power electronic converter fault diagnosis technical field.Method includes: obtaining relevant signal for diagnosis;According to three-phase voltage, three-phase current, three-phase inductance value, three-phase equivalent resistance value and switching period, the actual value of three-phase line voltage is calculated;According to DC voltage and the duty cycle of switch tube on three-phase bridge arm, the expected value of three-phase line voltage is calculated;Difference is obtained between the expected value and actual value of three-phase line voltage;The deviation value of three-phase line voltage is compared with first preset threshold and second preset threshold, to determine the polarity of the deviation value of three-phase line voltage;Wherein, first preset threshold is less than second preset threshold;The polarity of the deviation value of three-phase line voltage is combined with voltage phase, to determine fault switch tube.The application can quickly diagnose for various situations of multiple switch tube fault, including single switch fault, two switch tubes in succession fault, two switch tubes simultaneous fault.

The utility model relates to a power-off switch detection device which comprises a detection water tank and an air belt joint, a reciprocating cylinder is installed on the inner side of the detection water tank through an installation stand column, the telescopic end of the reciprocating cylinder is connected with a cylinder straight joint, and a power-off switch fixing support is installed at the lower end of the installation stand column. According to the utility model, the reciprocating cylinder controls the power-off switch to be continuously switched on and off on the power-off switch fixing support, so that whether the touch sense and the pressing force of a key or an operation part of a mechanical structure of the power-off switch are appropriate, whether the mechanical action is smooth and sensitive and the like can be effectively detected; in addition, connectivity of the power-off switch circuit can be detected, whether short circuit or open circuit exists or not can be detected, timely alarm and automatic shutdown can be realized when the power-off switch signal cable detects that the power-off switch is abnormal, and the service life limit of the power-off switch can be effectively detected.

The invention relates to a quick open and short circuit test dichotomy between any points of an IC wafer disc. A wafer bonding pad test channel is established based on a case board card framework, a test point TP corresponding to a wafer bonding pad is connected to N test unit board cards through a switch matrix, a connector and a carrier, and a power supply and communication link is formed by a backboard and a core control board. Each test unit board card executes an in-board dichotomy test and uploads an in-board open / short circuit initial determination result; the core control board executes an inter-board dichotomy grouping test on each slot position to determine a target board card set; and the test points TP of any two target board cards are divided into blocks and are positioned to the minimum block, point-to-point scanning is executed in the minimum block, and an open-short circuit positioning result is output. The method gives consideration to the configurable number of board cards and the multi-layer bipartite convergence path, and is suitable for the rapid open-short circuit positioning scene of the high-order-of-magnitude wafer bonding pad.

The present application relates to the field of rail train traction system circuit fault diagnosis, and discloses a kind of open-circuit fault diagnosis method and system of train traction converter, the method comprises: build orthogonal auto-encoder to construct the association between sensor sampling data Association graph, construct orthogonal projection loss function to guide the encoder to fit out orthogonal mapping, improve the explainability of encoder;Build the association relationship graph optimization model based on nearest neighbor optimization strategy, delete the neighbor node far away to accurately describe the association between data, and prevent model overfitting;Association relationship graph is converted into association relationship matrix, constructs graph convolution network, uses association relationship matrix in network forward propagation, trains graph convolution network, and carries out fault diagnosis based on the network after training is completed. Supervised association relationship graph construction can be realized, and the fault diagnosis accuracy of traction motor is improved.

The application discloses a current transformer disconnection detection method. The current transformer comprises a measurement transformer for measuring load current of a main circuit and an energy transformer for extracting energy from the main circuit; the temperatures of the measurement transformer and the energy transformer are monitored in real time, and the measured temperature difference between the two is compared with a standard temperature difference range corresponding to the current load current; if the measured temperature difference is within the standard temperature difference range, it is determined that the measurement transformer and the energy transformer are normal; if the measured temperature difference is higher than the standard temperature difference range, it is determined that the measurement transformer is disconnected; and if the measured temperature difference is lower than the standard temperature difference range, it is determined that the energy transformer is disconnected. The application also discloses a current transformer disconnection detection device and a circuit breaker. Compared with the prior art, the application realizes accurate detection of the disconnection fault of the energy transformer for the first time, and has low implementation cost and simple operation.

The embodiment of the invention relates to the technical field of capacitor detection, in particular to a capacitor open-circuit fault detection method, a battery system and a storage medium. According to the embodiment of the invention, the bus voltage and the candidate voltage of the candidate capacitor are sampled by using the existing voltage sensor, the candidate ratio is determined according to the bus voltage, the candidate voltage of the candidate capacitor and the target number, and the reference ratio is determined according to the target number and the number threshold value related to the battery system. And finally, a fault detection result of the candidate capacitor is obtained based on the candidate ratio and the reference ratio, so that the open-circuit fault of the single capacitor can be rapidly and accurately detected, a complex algorithm, accurate current sampling and addition of any additional hardware are not needed, the cost is low, the calculated amount is small, the requirement on the performance of a controller is low, and other control logics cannot be influenced.

The utility model relates to the technical field of mechanical engineering, and discloses a cutting and measuring integrated tool which comprises a cover plate, the top of the cover plate is fixedly connected with a fixing piece, the rear side of the top of the cover plate is fixedly connected with a connecting table, the top of the front side of the connecting table is fixedly connected with a first air cylinder, and the output end of the first air cylinder is fixedly connected with a movable plate. The bottom of the moving plate is fixedly connected with two pressing blocks, the front side of the moving plate is fixedly connected with two first testing needles, and the rear side of the top of the cover plate is fixedly connected with a second air cylinder. According to the utility model, the pneumatic scissors are used to cut off the protruding redundant metal inner core of the product, the first cylinder and the second cylinder drive the first test needle and the second test needle to test the product, and the shell and the inner core of the product are tested at the same time, so that the problems that the working efficiency is influenced and the cost is increased due to separate cutting and testing of the existing equipment are solved.

This invention relates to a testing circuit and method for e-ink screen panels, including first and second fast detection circuits and first and second detection circuits, which are composed of numerous thin-film transistors. The invention also provides a corresponding detection method. Before attaching the electronic paper film, a specific timing voltage is applied to the detection signal input terminal, and a voltage detection device can then determine whether the panel has any open or short circuit abnormalities. This method is not only accurate but also highly efficient for testing medium to large-sized display areas.

The invention discloses a three-phase voltage type PWM rectifier switch tube open-circuit fault diagnosis method, which comprises the steps of 1, implementing three-layer wavelet decomposition on an input side three-phase current historical database after a three-phase voltage type PWM rectifier power switch tube open-circuit fault by adopting a wavelet decomposition method, extracting a characteristic value corresponding to the switch tube fault and finishing normalization; and 2, performing parameter optimization on the support vector machine through an improved mouse group search algorithm, and determining an optimal penalty factor and a kernel parameter so as to carry out data training and fault diagnosis. The invention aims to analyze the waveform distortion condition of the three-phase current at the input side after the open-circuit fault of the three-phase rectifier switch tube, so as to optimize the fault characteristic quantity and realize the accurate diagnosis of the open-circuit fault of the power switch tube. According to the invention, the fault identification capability of the rectifier system under the abnormal working condition can be effectively improved, so that safe and stable operation of power electronic equipment is ensured.

A contactor detection circuit is disclosed. [Solution] The contactor detection circuit is configured such that the output terminal of a reference voltage generation circuit is connected to the inverting input terminal of the comparator and electrically connected to the two fixed contacts of the contactor in order to input a reference voltage V1 to the inverting input terminal of the comparator. The output terminal of a sampling circuit is connected to the common-mode input terminal of the comparator and the output terminal of a waveform generator is connected to the input terminal of the sampling circuit in order to input a sampling voltage V2 to the common-mode input terminal of the comparator. A periodically changing voltage signal V3 is input to the sampling circuit. When the contactor is open, the sampling voltage V2 output by the sampling circuit is a periodic waveform, causing the comparator to output a periodic square wave signal. When the contactor is closed, the sampling voltage V2 output by the sampling circuit is higher than the reference voltage V1, causing the comparator to output a high level.

This utility model relates to a low-cost, high-efficiency network BYPASS continuity testing circuit, including a first interface module and a second interface module. The first interface module is connected to a power module, and the negative terminal of the power module is connected to the first interface module. The second interface module includes an interface LAN2 and eight second signal lines connected to the interface LAN2. Each second signal line is connected to a corresponding light-emitting diode (LED), and the second signal line is connected to the negative terminal of the corresponding LED. The positive terminals of the eight LEDs are all connected to the positive terminal of the power module. When the two ends of the network cable are inserted into the interface LAN1 and the interface LAN2 respectively, if all eight LEDs light up, it indicates that the network BYPASS is normal. If any LED does not light up, then the signal line of the other lit LEDs has an abnormality. This detection circuit is simple, low-cost, and the electronic components are easy to replace, making it highly versatile.

The application discloses a kind of based on multi-sensor information fusion's wire identification and broken wire control method and system, it is related to transmission line identification and broken wire control technical field.The method includes: the two-dimensional image data and three-dimensional point cloud data of operation environment are collected;Multi-sensor fusion model based on space-time registration is constructed, the three-dimensional point cloud data is mapped to the two-dimensional image data, and the three-dimensional space pose of target wire is solved;The end trajectory of mechanical arm is planned based on the three-dimensional space pose, controls cutting execution mechanism to align and clamps target wire;Real-time monitoring the electromechanical state parameter of cutting execution mechanism in cutting process, calculates cutting impedance based on state observer model, according to the change characteristics of cutting impedance, identifies wire fracture critical point, and executes adaptive broken wire control strategy.The application is used to solve the problem of low wire identification accuracy and mechanical arm rebound instability in high tension broken wire instant under complex operation background.

Methods, apparatuses and systems for providing offset calibration and fault monitoring are disclosed herein. An example controller component may comprise: a resistance-based bridge circuit; a signal conditioning circuit configured to condition an output of the resistance-based bridge circuit; a first diagnostic circuit coupled to the signal conditioning circuit configured to monitor an output of a first branch of the resistance-based bridge circuit; and a second diagnostic circuit coupled to the signal conditioning circuit configured to monitor an output of a second branch of the resistance-based bridge circuit.

Systems, methods, and vehicles are disclosed herein. For example, this disclosure provides for continuous and reliable communication between a battery management system (BMS) and battery sensors and battery power and isolation (BPI) in the event of a breakage. As another example, this disclosure provides for an efficient hardware-based detection method for pressure buildup and thermal events allowing, for example, the BMS to remain asleep, thereby conserving battery power and enabling quicker response times. As another example, this disclosure provides for duty cycling cores while the vehicle is sleeping to provide the BMS an opportunity to measure the actual power draw from a high-voltage (HV) battery pack.

We provide technology that enables diagnosis of multiple electric wires in a space-saving manner. [Solution] A pulse output unit 331 and a measurement and diagnosis unit 332 measure physical quantities that change depending on the state of the electric wire using a measurement method determined for each electric wire, and diagnose the state of the electric wire according to the measurement results. A selection circuit 31 connects a selected electric wire, which is an electric wire selected from a target electric wire group that is a plurality of electric wires to be diagnosed, to a TDR circuit 33. A channel control unit 333 sequentially switches the selected electric wires to individually diagnose the electric wires belonging to the target electric wire group, and when diagnosis results are obtained for all of the electric wires belonging to the target electric wire group, switches the selection circuit 31 to a state in which the TDR circuit 33 is disconnected from any of the electric wires.

A battery monitoring device monitors an assembled battery in which sets of a plurality of battery cells connected in parallel to each other are connected in series to each other, the battery monitoring device includes an acquisition unit configured to acquire a voltage of the battery cell, a controller configured to control an upper limit value of a current flowing through the battery cell, and a detection unit configured to detect, in a case where the upper limit value is higher than a predetermined value, disconnection in the assembled battery in accordance with a comparison result between the voltage acquired by the acquisition unit and a first threshold value, in which the controller is configured to control the upper limit value such that the upper limit value is equal to or less than the predetermined value when the detection unit detects the disconnection in the assembled battery.