4693 results about "Low voltage" patented technology

The invention provides a test method and device for a motor active short-circuit relay, and a storage medium. The method includes the steps: performing the zero speed detection of a motor after a motor controller completes a low-voltage power-on operation, wherein when the motor controller is powered down, a first relay and a second relay are both switched on; controlling the second relay to be turned on if the motor passes the zero speed detection, and injecting a first excitation signal at the control ends of a first phase winding and a third phase winding through the motor controller; performing injection detection of the first excitation signal to determine whether the first excitation signal is successfully injected or not; controlling the first relay to be turned on if the first excitation signal is successfully injected, and obtaining a voltage across two ends of the first relay; and judging whether the power-on test of the first relay is successful or not according to the voltage across two ends of the first relay. The method can realize the turn-on test of the short-circuit relay, and ensures the reliability of the active short-circuit function of the vehicle motor duringdriving.

The invention relates to the technical field of intelligent power distribution system state monitoring, in particular to a cable connection state online monitoring method for a low-voltage cable branch box, which comprises the following steps of: applying a disturbance excitation signal to a connection node of the cable branch box, and acquiring transient voltage, current and phase response parameters of the node in different excitation periods; establishing a mapping relation between the node electrical characteristics and the connection state; performing dynamic reference calibration on the acquired signals based on a multi-node space-time coupling matrix to form an adaptive judgment reference of electrical coupling between nodes; a connection degradation sensitive index is extracted through feature sequence differential calculation, a connection state quantitative evaluation result is generated, and real-time updating and anomaly recognition are carried out according to the state change trend; according to the method, the problems of misjudgment and delay caused by a monitoring mode depending on indirect parameters such as temperature and current are solved, high environmental adaptability and degradation identification precision are achieved, and the operation safety and monitoring reliability of the low-voltage power distribution system are greatly improved.

The invention relates to a low-voltage motor insulation resistance online monitoring and early warning method, system and device and a medium. The method comprises the following steps: firstly, acquiring multi-dimensional operation data through a data acquisition link to form an original monitoring data set; preprocessing the original monitoring data set, and focusing core information through dimension reduction processing to obtain a key parameter set; and then inputting the key parameter set into a dynamic correlation model constructed based on a long short-term memory network, and outputting a prediction result of the variation trend of the insulation resistance value along with time and the deterioration degree quantification. And finally, carrying out early warning analysis based on a prediction result, and generating early warning fault features in combination with a real degradation judgment process. According to the method, the insulation resistance trend and the degradation degree are accurately predicted, the defect of insufficient real-time performance of off-line detection is overcome, the accuracy and the pertinence of fault early warning are improved, and equipment shutdown and safety risks caused by insulation faults are effectively reduced.

The invention discloses a fault ride-through test method for an offshore wind power flexible direct output system, and the method comprises the steps: building a fault equivalent circuit of the offshore wind power flexible direct output system, analyzing the operation characteristics of an AC power grid side under a low-voltage fault, and determining the incidence relation between the DC side excess energy and the power grid voltage drop; establishing a model representing each component in the fault equivalent circuit, wherein the components at least comprise a machine-side converter, a grid-side converter, a direct-current capacitor and an unloading resistor; when a low-voltage fault of an alternating-current power grid side is detected, executing the following cooperative control based on the model: synchronously starting unloading resistance control and reactive power support control, wherein an unloading resistor dissipates excess energy of a direct-current side through a direct-current chopper; the grid-side converter injects a capacitive reactive current which is deeply matched with the voltage drop of the power grid so as to improve the voltage of a grid-connected point; and if the direct-current voltage continuously exceeds the preset threshold value, starting power prompt drop control, and reducing the output power of the unit according to a gradient until the system recovers to be stable.

The invention discloses a low-voltage cabinet fault prediction method and system based on artificial intelligence, and relates to the technical field of low-voltage electrical equipment state monitoring, and the method comprises the steps: obtaining operation data, such as current and voltage, collected by a sensor in a low-voltage cabinet; a multi-dimensional tensor structure containing spatial topological codes is constructed through preprocessing such as normalization; inputting a fault prediction model to obtain fault type probability and trend evaluation parameters, and generating a dominant abnormal factor index set through an interpretable module; analyzing a root cause path by using a fault causal knowledge graph in combination with the data, and determining a fault evolution chain; and finally generating interpretable early warning prediction information. The technical problems that a traditional low-voltage cabinet fault detection mode is difficult to process multi-dimensional complex data, cannot efficiently mine key fault information and is difficult to accurately predict are solved, the prediction model is constructed by using the deep learning technology, and then efficient processing of the multi-dimensional complex data of the low-voltage cabinet and deep mining of the key fault information are achieved. The technical effect of accurate fault prediction is achieved.

The invention relates to the technical field of intelligent power grids, in particular to a low-voltage draw-out type switch cabinet which comprises a cabinet body, a power grid arranged on the inner side wall of the cabinet body, a heat dissipation plate arranged on the inner side wall of the cabinet body, a plurality of static contacts arranged on the inner side wall of the cabinet body and a cleaning mechanism arranged on the inner side wall of the cabinet body and used for cleaning the power grid. The cleaning mechanism comprises two first electric sliding rails arranged on the inner side wall of the cabinet body, according to the low-voltage draw-out type switch cabinet, the overturning plate is driven by the first motor to rotate at multiple angles, the spraying head can evenly cover the outer corners of the cabinet body after the insect repellent is atomized, reptiles are dispersed from the source, and the low-voltage draw-out type switch cabinet is convenient to use. The cleaning mechanism can be quickly started, heat dissipation blocking and equipment faults caused by accumulation of dead insects are prevented, and it is guaranteed that the low-voltage draw-out type switch cabinet is always kept in a safe and stable working state in long-term operation.

The invention discloses a voltage acquisition circuit, an alternating current power supply, a voltage acquisition method, a voltage acquisition device and a medium. A far-end sampling unit; the in-phase input end of the first comparison unit is connected with the near-end sampling unit, and the inverted input end is grounded; the in-phase input end of the second comparison unit is connected with the far-end sampling unit, and the inverted input end is grounded; the input end of the XOR unit is connected with the output ends of the first comparison unit and the second comparison unit; the in-phase input end of the third comparison unit is connected with the output end of the XOR unit, the inverted input end inputs reference voltage, and the reference voltage is smaller than half of the power supply voltage; the control unit is used for judging that far-end sensing sampling is abnormal when the difference effective value of the voltages output by the near-end sampling unit and the far-end sampling unit is smaller than the preset compensation voltage and the abnormal comparison voltage output by the third comparison unit is 1. According to the invention, when the AC power supply outputs low voltage, the conditions of disconnection and reverse connection of the far-end induction sampling can be identified.

The present disclosure provides a gate driving circuit and a display panel. by the control of one of the fourth node, the output end of the second output module, and the first node of the shift register of the next stage, the voltage regulating module may utilize a low voltage signal to stabilize or reduce the gate voltage of the second transistor, so that the second transistor is stable or preferably in the cut-off state to reduce the leakage current. In this way, voltage level of the second gate driving signal can be maintained at a high voltage level or a pulse amplitude.

A heterojunction device having at least three terminals, the at least three terminals comprising a high voltage terminal, a low voltage terminal and a control terminal. The heterojunction device further comprises at least one main power heterojunction transistor, an auxiliary gate circuit comprising at least one first low-voltage heterojunction transistor, a pull-down circuit comprising a capacitor and a charging path for the capacitor. The heterojunction device further comprises at least one monolithically integrated component, wherein the capacitor is configured to provide an internal rail voltage for the at least one monolithically integrated component.

Systems and methods for operating a vehicle power system are described. The vehicle power system includes an inverter and an electric machine. Switches and a diode are arranged in a way that allows a traction battery to be charged by either a lower voltage charger or a higher voltage charger. Additionally, the switches and diode allow the vehicle power system to heat the traction battery so that the traction battery may operate in a desired temperature range.

The embodiment of the invention discloses a bidirectional switching device. The bidirectional switching device comprises a control node, a first load node, a second load node, a main substrate, a main transistor and a substrate potential modulation circuit, the main transistor is a bidirectional conduction transistor and comprises a first gate terminal, a first main electrode terminal, a second main electrode terminal and a first main substrate terminal, the first gate terminal is connected to the control node, and the second gate terminal is connected to the second load node. The first main electrode terminal is connected to a first load node, the second main electrode terminal is connected to a second load node, and the first main substrate terminal is connected to the main substrate. The substrate potential modulation circuit adjusts the substrate potential of the bidirectional switching device to be always basically consistent with the lower voltage in the voltages at the first main electrode terminal and the second main electrode terminal according to the signals in the first main electrode terminal and the second main electrode terminal. Therefore, the potential floating of the main substrate can be effectively inhibited, and the stability and the performance consistency of the device are improved.

The invention relates to the technical field of preparation of aluminum alloy conductor materials, and particularly discloses a preparation method of an Al-Mg-Si-RE-based aluminum alloy conductor for a 10-35kV middle and low voltage cable, which comprises the following steps: adding a microalloyed intermediate alloy into an aluminum melt by adopting an addition method, stirring, smelting, refining, and casting to form, thereby obtaining the Al-Mg-Si-RE-based aluminum alloy conductor for the 10-35kV middle and low voltage cable. And performing annealing, rolling, wire drawing and aging heat treatment to obtain a final product. Wherein in the smelting stage, raw materials are completely melted at 700-750 DEG C; hexachloroethane is used as a refining agent for refining; annealing at 330-350 DEG C and preserving heat for 4-8 hours; and aging at 300 DEG C for 10 hours after deformation. In the preparation of a wire of a 10-35kV medium and low voltage power cable, the aluminum alloy wire has high conductivity of 62.1-62.5% IACS (International Annealed Copper Standard) and tensile strength of 101-117MPa by simplifying the process steps and optimizing the element ratio on the premise of ensuring the controllable raw material cost, and the mechanical property and electrical property requirements of the medium and low voltage wire are balanced.

The invention provides a high and low voltage power distribution cabinet remote operation and maintenance management and control system based on cloud computing, relates to the field of remote operation and maintenance management, and improves the accuracy and operation and maintenance efficiency of power distribution cabinet fault early warning. The method comprises the following steps: firstly, acquiring sensing data through an edge intelligent sensing module, performing multi-dimensional correlation analysis based on a static safety threshold, identifying an abnormal trend with spatial-temporal correlation, and generating a preliminary early warning; then, a cloud platform prediction decision module drives the digital twin model to carry out dynamic simulation, and a predictive maintenance strategy and a dynamic safety threshold are generated in combination with a prediction algorithm of a historical performance decline curve; and finally, the adaptive control execution module optimizes subsequent analysis by using a dynamic threshold value, and triggers a differential control action from monitoring adjustment to emergency isolation according to a strategy type. According to the invention, by constructing the closed-loop intelligent operation and maintenance architecture of cloud-side cooperation, the operation and maintenance mode transformation from passive response to active prediction is realized, and the reliability and safety of the operation of the power distribution system are significantly improved.

The invention discloses a tripping structure and a circuit breaker, and relates to the low-voltage electrical technical field. The tripping structure comprises a pushing piece, a thermal tripping piece and an electromagnetic tripping assembly, wherein the thermal tripping piece and the electromagnetic tripping assembly are respectively matched with the pushing piece; the pushing piece comprises a first driving surface and a second driving surface which are arranged at an interval; the electromagnetic tripping assembly comprises a push rod; the deformation end of the thermal tripping piece is arranged on one side, deviating from the second driving surface, of the first driving surface; the deformation end of the push rod and the deformation end of the thermal tripping piece independently drive the pushing piece to move through the first driving face, and the second driving face is used for driving the operating mechanism to unlock. According to the tripping structure, through the position arrangement of the pushing piece, the driving force of the thermal tripping piece and the electromagnetic tripping assembly can be directly transmitted to the operating mechanism through the pushing piece, and compared with the existing two-stage transmission arrangement, the tripping structure provided by the invention has the advantages that the transmission links are reduced, the transmission loss is reduced, and the transmission efficiency of the driving force is improved.

The invention relates to the technical field of crosslinked polyethylene insulated power cables, in particular to a flame-retardant and insulated low-voltage power cable and a preparation method and application thereof. The flame-retardant and insulating low-voltage power cable comprises the inner core layer, the filler layer, the belting layer, the lining layer, the metal armor layer and the outer sheath layer from inside to outside, and the multiple layers can effectively protect the inner core and endow the cable with better performance; in addition, low-density polyethylene, a furan modified polyethylene compatilizer, a reactive flame retardant, bismaleimide, dicumyl peroxide and an auxiliary are adopted to obtain the cross-linked polyethylene material for the cable outer sheath, and the cross-linked polyethylene material has excellent insulation, flame retardance, strength, toughness and repairing performance.

The invention discloses an anti-condensation and humidity control system of a low-voltage switch cabinet, and relates to the technical field of environment regulation and control of low-voltage electrical equipment, and the system comprises a data collection module which collects data through a multi-region temperature and humidity sensor; the humidity prediction module is used for predicting 30-minute humidity by using a long-short-term memory neural network in combination with cabinet body parameters and historical data, and pre-evaluating the condensation risk; the anti-condensation execution module is used for starting a PTC heating device, an axial flow ventilation device or a semiconductor dehumidification device according to the prediction result; the system linkage module interacts with an electric power monitoring system and adjusts parameters of the execution device when the load is high; the parameter self-learning module is used for optimizing the prediction model and recording optimal threshold values of the device in different environments; and the safety protection module is used for monitoring the heating temperature and the condensate water level and switching an emergency strategy when a fault occurs. The system has the advantages of comprehensive monitoring, accurate prediction, cooperative operation of execution devices, adaptation to different environments and loads, reduction of condensation faults, prolongation of the service life of elements, and improvement of the operation reliability of the switch cabinet.

The invention discloses a hydro-generator excitation loss fault diagnosis method and device, and belongs to the technical field of power system relay protection, and the method comprises the following steps: collecting the phase current and line voltage of a hydro-generator terminal; the collected current and voltage data are stored in a register in sequence, and after the register is full, the last data is deleted when a new group of data is stored; calculating an instantaneous power integral according to m groups of current and voltage data in the register and solving a discrete form of the instantaneous power integral; normalizing the obtained instantaneous power integral to obtain an initial field loss fault index; eliminating average fluctuation of the initial field loss fault index to obtain a final field loss fault index; and judging the field loss fault by combining whether the final field loss fault index is smaller than a threshold value or not and a low-voltage criterion, and locking the field loss fault criterion by using a direct-current component criterion and a negative-sequence voltage criterion to avoid an external fault. The method does not depend on the operation state of the generator too much, has high sensitivity, and reduces the maloperation risk.

The invention discloses a power distribution network area low voltage prediction method, and relates to the technical field of voltage prediction, and the method comprises the steps: S1, data preprocessing; s2, establishing a GA-BP neural network load prediction model; s3, GA-BP load prediction model simulation is carried out; s4, establishing an LSTM neural network voltage prediction model; s5, performing model simulation and result analysis; and S6, voltage prediction and treatment suggestion. According to the power distribution area low voltage prediction method, firstly, a GA-BP neural network is utilized to predict area loads, influence factors such as temperature, humidity, date types and different moments in one day are fully considered, and predicted load data are utilized as input to construct an LSTM model to predict area voltages; the transformer area low voltage is effectively predicted through the GA-BP-LSTM combined model, the model is high in fitting degree and low in prediction error, the low voltage degree of a user is reflected in real time, and more information support is provided for follow-up transformer area low voltage treatment.

The invention relates to the technical field of cable fault positioning, in particular to a cable fault accurate positioning method based on multi-channel synchronous acquisition, which comprises the following steps: S1, constructing a multi-channel adaptive acquisition system which comprises a main controller, a multi-channel acquisition module, a synchronous control module and a data transmission module; s2, multi-channel data synchronous acquisition is carried out through the synchronous control module, wherein the multi-channel data comprises impedance data, temperature data, partial discharge signals and insulation resistance data; during use, through a multi-channel adaptive acquisition design, monitoring channels can be flexibly selected according to cable materials, operation years and environmental conditions, different aging fault characteristics are comprehensively covered, the fault omission ratio and the false alarm rate are reduced, different types of low-voltage cables are adapted, a synchronous scheme of constant-temperature crystal oscillator and hardware triggering is adopted, and the reliability of the system is improved. The method does not need to depend on a GPS / PTP time service module, is favorable for saving cost input, and eliminates environmental interference and single parameter false triggering.

Systems and apparatus are provided for a high-power microwave sensor using an unmanned aerial vehicle. The unmanned aerial vehicle may include a central body, at least one electric motor, and a barometric pressure feedthrough. The central body may include a first enclosure housing a plurality of low voltage components, a voltage feedthrough connector, and a second enclosure housing a plurality of high voltage components. The low voltage components may include a first signal processing system, a first radio transceiver, a flight controller, a second signal processing system, a second radio transceiver, and a navigation system. The high voltage components may include a plurality of electronic speed controllers, a power distribution module, an input power interface, and a plurality of high power filters. The components of each enclosure may be segregated such that the high voltage components do not create electromagnetic interference with the low voltage components.

The invention belongs to the technical field of vehicle-mounted power supplies, and particularly relates to a driving circuit of a safety switch of a low-voltage battery, a low-voltage battery power supply system and a vehicle power system, and the driving circuit comprises a driving module, a reference end of which is used for being connected with a source electrode of the safety switch and is grounded; one end of the driving resistor is connected with the output end of the driving module, and the other end is connected with the grid of the safety switch; one end of the limiting capacitor is connected with the other end of the driving resistor, and the other end of the limiting capacitor is connected with the drain electrode of the safety switch or grounded; wherein the capacitance value of the limiting capacitor at least exceeds the capacitance value of a parasitic Miller capacitor of the safety switch with the preset first multiplying power, so that the grid current of the safety switch is limited, and the Miller plateau area of the safety switch is prolonged. The Miller platform area of the safety switch is prolonged, so that the drain current iD of the safety switch can charge the inner side capacitor in an approximate constant current mode, triggering of a reverse over-current fault is prevented, and charging of the inner side capacitor cannot be interrupted.

The invention discloses a method and device for measuring a crystal electro-optical coefficient at low voltage, and relates to the technical field of photoelectric coefficient measurement, and the method comprises the steps: employing a wavelength tunable laser as an incident light source of a crystal electro-optical coefficient detection system; before an incident light source is input into a to-be-measured laser crystal, a wave plate is added to serve as a phase compensator to generate phase delay phi 1, and meanwhile the to-be-measured laser crystal generates phase delay phi 2 under the action of direct-current voltage; when the crystal electro-optical coefficient detection system is a half-wave voltage detection system; adjusting the wavelength of the tunable laser so that 3pi / 4 is less than or equal to phi1lt; pi; when the crystal electro-optical coefficient detection system is a full-wave voltage detection system, the wavelength of the tunable laser is adjusted to enable 7pi / 4 to be smaller than or equal to phi1lt; 2pi. As the used light source is the wavelength tunable laser, phi 1 can be adjusted in a large range by changing the wavelength, so that phi 2 and the test voltage are changed, the purpose of measuring the electro-optical coefficient of the crystal at low voltage is achieved, and the test safety is improved.

The invention discloses a range-extended hybrid motorboat system and a control method, and relates to the technical field of new energy engineering, and the system comprises a man-machine interaction unit which is used for receiving an operation instruction and displaying a system state; the system control unit is used for receiving a user instruction and feedback information and issuing a control instruction to the corresponding unit; the high-low voltage unit is used for storing, converting and distributing the electric energy; and the power integration unit is used for providing a fuel power source for the range extending mode and comprises an engine, an engine controller, an electric control ISG motor, an electric control driving motor, a cooling device, a fuel tank and a liquid level sensor. The range-extended hybrid power mode of fuel power generation and motor driving is adopted, the battery is continuously charged or the electric control driving motor is directly supplied with power when the electric quantity is insufficient, energy can be quickly supplemented through refueling, the problems that a pure electric motorboat is short in endurance and inconvenient to charge are effectively solved, and the service life of the pure electric motorboat is prolonged. The advantages of low noise and zero emission of pure electric drive and long endurance of fuel power are achieved.

The invention discloses an energy-saving control method for a new-energy high-low-voltage direct-current relay. The energy-saving control method comprises the steps of analyzing a mapping relation between a silicon steel sheet stacking angle and a magnetic flux path deviation, calculating magnetic domain wall moving resistance according to magnetic domain boundary stress, determining a magnetic domain overturning speed by combining a magnetic field change rate, and measuring a hysteresis loop width parameter. Adjusting the width and frequency of the excitation current pulse according to the magnetic domain overturning frequency and the hysteresis loop offset and width to obtain an optimized excitation current pulse sequence, and determining the hysteresis loop expansion speed according to the hysteresis loop area change rate; the local high-temperature area temperature is analyzed through the iron core temperature rise rate, the local high-temperature area distribution and the magnetic domain energy dissipation data, if the local high-temperature area temperature exceeds the preset threshold value, the excitation current pulse is adjusted, stable iron core temperature rise control data is obtained, the coercive force change amplitude is determined, the magnetic hysteresis loss and the temperature rise are reduced, the stability of the relay under high-frequency switching is improved, and the reliability of the relay is improved. And the operation efficiency and reliability of the system are greatly improved.

Technology for programing NAND memory. A memory system has control circuitry that applies a low voltage (e.g., VSS) to SGS lines in one or more unselected blocks that neighbor a block that has been selected for programming. This low voltage keeps source select transistors off, which cuts off the NAND channels in the neighbor unselected block(s) from the source line. The control circuit may float the SGS lines in other unselected blocks, which allows the source line voltage to ramp up quickly to provide for a faster programming operation.

The invention relates to the technical field of wireless charging, in particular to a wireless charging system and an application method, and the system comprises m inverters, m-1 RIITs and transmitting coils at a GA end, n first rectifiers at a VA end, RIITs corresponding to n-1 first rectifiers, q second rectifiers, RIITs corresponding to q second rectifiers and receiving coils. The output ends of the n first rectifiers are connected in parallel and are used for outputting electric energy to the high-voltage battery; and the output ends of the q second rectifiers are connected in parallel and are used for outputting electric energy to the low-voltage battery. The high-voltage battery and the low-voltage battery supply energy through the receiving coil at the VA end, the charging mode can be changed by setting the working state of the rectifier, and decoupling control over charging of the high-voltage battery and the low-voltage battery is achieved. According to the invention, the size and cost of the charging structure of the VA end can be effectively reduced, and different levels of power requirements can be met by adjusting the number of inverters and rectifiers.

The invention discloses a power supply control system and method for an eVTOL low-voltage distribution box, and relates to the technical field of power supply control, and the system comprises a multi-source double-bus power supply unit, a voltage reduction unit and an output unit. The multi-source double-bus power supply unit comprises a first bus independent power supply channel and a second bus independent power supply channel, the first bus independent power supply channel and the second bus independent power supply channel are isolated based on a contactor, the first bus independent power supply channel comprises x heterogeneous power sources and x ideal diodes, and the x heterogeneous power sources comprise a high-voltage-to-low-voltage DC-DC power source, a ground power source and n lithium battery power sources. The second bus independent power supply channel comprises y paths of heterogeneous power supplies and y ideal diodes, and the y paths of heterogeneous power supplies comprise y paths of lithium battery power supplies; the step-down unit comprises m paths of DC-DC step-down converters; and the output unit comprises m ideal diodes which are connected in parallel with the output end of the DC-DC buck converter. According to the invention, the stability and quality of power supply are ensured, and airborne equipment is ensured to work in a stable voltage and current environment.

The invention discloses a negative voltage clamping circuit and method. The negative voltage clamping circuit comprises a current mirroring module which is used for providing a reference current Iref and generating a corresponding reference current according to a preset current proportion mirroring; the voltage detection module is connected with the current mirror module and the negative voltage input end of the chip and is used for detecting the voltage VS of the negative voltage input end; and the clamping control module is connected with the current mirroring module and the voltage detection module, and the clamping control module is configured to be switched on when the voltage VS of the negative voltage input end exceeds a preset clamping threshold value and clamp the voltage VS of the negative voltage input end within a preset range. According to the negative voltage clamping circuit, the change of the negative voltage input end can be monitored in real time, it is ensured that the clamping control module responds rapidly when the voltage exceeds a threshold value, the negative voltage is limited within a safe range, circuit damage or performance reduction caused by too low voltage is avoided, and therefore the stability and reliability of a chip are improved.

The invention provides a fault positioning and tracing method and device for operation information of a medium-low voltage power distribution network, and the method comprises the steps: collecting multi-source heterogeneous data through sensing nodes arranged in the medium-low voltage power distribution network, and carrying out the data processing, and forming model input data; then obtaining a current fault state classification result by using a pre-trained fusion fault detection model; then calculating the delay inequality of fault signal mutation among the sensing nodes according to the classification result, and deducing a preliminary positioning result by combining the physical space position coordinates of the nodes and the delay inequality; mapping the preliminary positioning result into an actual power distribution network topology, and combining with topological structure correction to obtain a corrected positioning result; and finally, based on a fault state classification result and a correction positioning result, matching an event with the most similar cause path from historical fault events to obtain a traceability result. Through multi-source data monitoring and fault tracing, the risk of missed judgment and misjudgment is reduced, systematic tracing is realized, and accurate decision support is provided for operation and maintenance.

This disclosure is directed to column driver circuitry of a memory device. A memory bank of the memory device may include multiple memory cells arranged along multiple column select lines and row select lines. The column driver circuitry may include column drivers coupled to the column select lines. A column driver may generate a column select signal with multiple voltage steps for accessing a target memory cell coupled to a respective column select line. The column decoder may include circuitry to adjust a voltage level and / or duration of each voltage step of the column select signal to provide a desired voltage level to a target memory cell based on a disposition of the target memory cell along a column select line. For example, the column decoder may output a higher voltage level followed by a lower voltage level to access the target memory cell. The higher voltage level and the lower voltage level may be above a threshold voltage level for accessing the target memory cell.