152results about How to "Ensure power supply security" patented technology

The invention discloses a method and a system for supplying power to a mobile terminal. In the method, two power supply channels 1 and 2 of a programmable power supply are used for supplying power supply voltages needed by a battery terminal and a charging terminal of the mobile terminal when the mobile terminal works normally. The method particularly comprises the following steps that: the character that the charging terminal of the mobile terminal also generates startup current when the loaded power supply voltage is insufficient is utilized, and before electricity is supplied to the mobile terminal formally, whether a power supply terminal of the mobile terminal is correctly connected is judged by outputting a test voltage in advance and detecting the startup current, so the power supply safety of the mobile terminal is ensured, the problem that the mobile terminal is damaged due to reverse connection of the power supply terminal is avoided, furthermore, the generation of fault machines is reduced, the production cost is reduced, and the first pass yield rate of production is improved. The method for power supply has a simple design, can provide conveniences for a line operator to make judgments, and is suitable for popularization and application in related mobile products such as mobile phones, MP4 and the like.

The invention discloses an online monitoring and pre-warning protection method and system for a high-voltage switch cabinet. The method comprises the following steps of collecting and storing temperature data of each busbar or contact of the high-voltage switch cabinet and transmitting the temperature data to a monitoring controller; receiving the temperature data by the monitoring server, generating a temperature curve of each busbar or contact within a preset time period, and carrying out wavelet packet transform denoising on the temperature curve; obtaining an unequal interval temperature sequence of each busbar or contact within the preset time period according to the denoised temperature curve; establishing a second-order difference equation for predicting temperature, fitting the second-order difference equation through utilization of the unequal interval temperature sequence, calculating a coefficient of the second-order difference equation through a least square principle, thereby obtaining a temperature prediction formula of each contact or busbar; and obtaining a predicted temperature value of each busbar or contact after preset time according to the temperature prediction formula, and when the predicted temperature value is greater than an alarm threshold value, generating alarm prompt.

The invention discloses a method for over-speed protection of a turbine under the load shedding working condition, which comprises the following steps that: (1) when the load of a unit is more than or equal to 30 percent of rated load and a generator oil switch is switched off, over-speed protection control (OPC) acts, and when the rotating speed of the turbine is less than the rated rotating speed, the OPC resets; and (2) when the rotating speed of the turbine is more than or equal to 103 percent of the rated rotating speed, the OPC acts, and when the rotating speed of the turbine is less than the rated rotating speed, the OPC resets. By the technical scheme, for a turbo generator unit with a fully opened intermediate regulating valve under the load shedding working condition, the OPC action frequency can be effectively reduced and secondary acceleration over-speed can be avoided under the load shedding working condition; and for a unit of which the intermediate regulating valve participates in regulating under the load shedding working condition, the rotating speed of the unit is stabilized as soon as possible. Therefore, the technical scheme has important significance for ensuring the safe and stable running of the turbo generator unit and safe power supply of a power grid.

The invention provides a method for controlling a load-shedding working condition of a supercritical unit. The method comprises the following steps of: when the load-shedding working condition is detected, starting an ignition system and operating a set quantity of powdering systems; reducing the total coal quantity of a boiler to rated fuel quantity for maintaining pressure and combustion stability, and supplying water of which the quantity corresponds to the total coal quantity; and opening a high-pressure bypass and a low-pressure bypass, adjusting the openness of the high-pressure bypass and the openness of the low-pressure bypass according to a unit load, and controlling the pressure of the boiler to return to a normal state. Moreover, the invention also provides a system corresponding to the method. By the method and the system for controlling the load-shedding working condition of the supercritical unit, when the load-shedding working condition of a generator unit occurs, steam in the boiler is scientifically and reasonably discharged by bypass control, the boiler can safely and stably operate, stress damage to the metal of the unit is reduced, and safety in power supplying of a power grid is ensured.

The invention provides a satellite thermal vacuum test ground power supply system. A solar simulation array converts a three-phase alternating current into a constant current source for providing a charging power supply to a satellite; a launching control platform carries out on-off control and state monitoring on a charging link and simultaneously collects voltages of storage batteries and platform buses on the satellite; an external transit cable network divides the charging power supply into two paths, wherein one path is connected to sliding rings of the satellite through a flange disk and an internal transit cable network, and then output power is connected to a diverter and a charge and discharge regulator of the satellite through sliding ring channels; and the other path is connected to a pull-off plug through the flange disk and the internal transit cable network, and then output power is connected to the diverter and the charge and discharge regulator through pull-off plug channels, so that standby channels are available for supplying power to the satellite when the sliding rings break down, the battery discharge depth of the satellite does not exceed a designed value, and a thermal vacuum simulation test can be continued. The satellite thermal vacuum test ground power supply system is simple in structure, an existing system is changed a little, and proved by experiments, the method is reasonable and feasible.

The invention relates to a self-healing method of 110kV transformer station hand-in-hand power supply, aiming at performing network reconstruction to recover power supply when power failure occurs in a plurality of main transformers at the same time for a 110kV transformer station hand-in-hand power supply loop. The self-healing method of 110kV transformer station hand-in-hand power supply includes the following steps: 1) constructing a 110kV transformer station hand-in-hand power supply self-healing system; 2) utilizing the self-healing system to acquire a breaker position signal, an alternating current and voltage and a line protection motion semaphore of each 110kV line on the whole loop in real time; and 3) when power failure occurs in the plurality of main transformers at the same time because the 110kV transformer station hand-in-hand power supply loop malfunctions, and when segmental auto-switching in the 110kV transformer station fails to actuate, making a decision and sending out a control command to perform network reconstruction by the self-healing system, isolating the position where the fault occurs to guarantee power supply. Compared with the prior art, the self-healing method of 110kV transformer station hand-in-hand power supply has the advantages of guaranteeing safety of power supply, and being adaptive to various fault types.

The invention provides an explosion-proof equipment test system under the action of an explosion multi-physics field, the damage characteristics of the explosion multi-physics field can be tested at the same time, and data support is provided for accurate evaluation of the explosion-proof performance of the explosion-proof equipment. The test system comprises a test platform, an explosion transient optical test unit, a shock wave overpressure test unit, an explosion driving fragment test unit, an explosion mechanical work test unit, an explosion seismic wave test unit, an explosion transient temperature field test unit, an explosion noise test unit, an explosive and to-be-tested explosion-proof equipment. The test platform comprises a mounting platform, a base, a support frame and an annular target, the table top of the mounting platform is used as a test plate for placing the explosive and explosion-proof equipment to be tested, and the explosion-proof equipment covers the explosive; the annular target is of a semicircular structure formed by connecting more than two arc-shaped authentication targets in sequence; the annular target is supported on the mounting platform through the support frame so that the explosive on the mounting platform is positioned at the circle center of the annular target.

The invention relates to the technical field of rail construction and aims to provide a subway contact network abrasion measuring method and system based on a 3D structured light camera. The method comprises the following steps: S1, scanning the bottom contour of a contact line, obtaining a contact line contour image and executing S2; S2, de-noising and smoothing the acquired contact line contourimage and executing S3; S3, judging whether a contact line is a rigid line or not according to contact line contour data in the contact line contour image, if so, executing S5, and if not, executing S4; S4, adding a plurality of auxiliary points to two ends of the contact line contour respectively, constructing curvature mutation, and executing S5; S5, screening feature points representing a contour edge of the contact line, and executing S6; and S6, calculating an abrasion angle of the contact line. The method and the system has the advantages that traction power supply safety is ensured, manpower and time cost is saved, and working efficiency is improved.

The invention provides a ship emergency power source system based on solar power generation. According to the system, under good light conditions, a lithium battery pack is charged through a solar power generation device and inverted through a two-way photovoltaic inverter after being fully charged, and then the lithium battery pack is connected into a ship main electric network on a ship emergency switchboard (2); when the light conditions are poor or the solar power generation device fails, the ship main electric network is rectified through the two-way photovoltaic inverter and then used for charging the lithium battery pack to ensure the reliability of the lithium battery pack serving as a ship emergency power source; when the ship main electric network is powered off, failure of the ship main electric network is automatically detected through the system, and the emergency power source supplies electricity to emergency loads through the ship emergency switchboard to achieve energy conservation and emission reduction. While solar energy (clean energy) is used sufficiently, voltage stabilization and energy storage functions of lithium ion batteries in the system are brought into play, and not only are fuel consumption and exhaust emission reduced, but also a diesel oil emergency power generation unit can be replaced.

The invention discloses a live detection system for DC cable leakage current. The DC cable leakage current live detection system comprises a micro-current sensor, a difference amplification and filtering module, an A/D module, a DSP control circuit, a display module and a communication module; the micro-current sensor transmits a detected current analog signal to the difference amplification and filtering module; the difference amplification and filtering module generates an amplified analog signal and transmits the amplified analog signal to the A/D module; the A/D module transmits a digital signal to the DSP control circuit; the DSP control circuit processes the digital signal to generate a control signal and a transmission signal; the control signal is fed back to the difference amplification and filtering module; the DSP control circuit displays the transmission signal through the display module; and the DSP control circuit performs communication on the transmission signal through the communication module. The live detection system can effectively and reliably detect an insulation state of a DC cable system and can guarantee power supply safety of a power grid.

The embodiment of the invention discloses a banked battery and a voltage balancing method thereof. The banked battery comprises a power bus and at least two batteries, wherein each battery comprises abattery cell, an even voltage charging module, a charging switch, a discharging switch and a battery management device, wherein the battery management device is connected with the battery cell, and is used for acquiring the voltage state of each battery; if the voltage state of each battery is a discharging requiring state, the battery management device of the battery controls the discharging switch to discharge through the power bus; if the voltage state of each battery is a charging requiring state, the battery management device of the battery controls the charging switch to charge throughthe power bus; and when the charging current is larger than a first current threshold value, the even voltage charging module is controlled to charge through the power bus. According to the technicalscheme, the problem of influence on the charging/discharging capacity of the batteries due to severe heating of the batteries caused by over large charging/discharging current under voltage imbalanceamong the batteries in an existing banked battery is imbalanced is solved.

The invention relates to a commutation opportunity determination method and a commutation system for three-phase unbalanced commutation. The method comprises the steps of converting a multi-objectiveoptimization problem into a single-objective optimization model through a constraint method, solving an optimal solution set of the single-objective optimization model in combination with a genetic algorithm and a simulated annealing algorithm, determining an optimal solution in the optimal solution set, determining the optimal solution as a commutation opportunity, and determining a to-be-switched load and a switching sequence thereof based on the commutation opportunity so as to carry out switching. According to the method, multiple targets are converted into one target, the calculation efficiency is improved, the number of generated current optimal solutions is controlled by adjusting breakpoints of constraint conditions, and high objectivity is achieved. Secondly, through combination of a genetic algorithm and a simulated annealing algorithm, a global optimal solution can be rapidly and accurately obtained, safety risks caused by three-phase imbalance are effectively avoided, and the level of power grid operation planning is improved. In addition, three-phase imbalance states of transformers of different types and different capacities can be analyzed, and the application rangeis wide.

The invention provides an active early warning type external force damage prevention dangerous point management and control method of a power transmission and distribution line. The method comprises the following steps of S01, performing safety distance monitoring on an external force damage dangerous point near the power transmission and distribution line through an on-site comprehensive monitoring terminal; S02, establishing a danger source dynamic management library, and forming a regional external damage prevention danger source dynamic distribution diagram; S03, through an external forcedamage dangerous point management and control system, monitoring a working state of an inspector in real time; and S04, establishing a dynamic remote monitoring platform, and performing comprehensiveanalysis on the monitoring data information so as to perform pre-judgment and pre-control on an external damage accident of a key region. A frequency of external force damage accidents of the power line can be reduced, safe operation of a power grid is better maintained, and safe operation and an intelligent management level of the power transmission and distribution line are further improved.

The invention provides a transformer substation field maintenance and repairing real-time communication system. The system comprises a cloud electric power information processing unit, a monitoring center service area and transformer substation maintenance areas; the monitoring center service area comprises a monitoring center communication module, a monitoring center host, a monitoring area imageacquisition module, a monitoring area sound acquisition module and a monitoring center display module; and the monitoring center host, transformer substation maintenance hosts, an electric power transmission and transformation equipment maintenance host and a terminal maintenance host achieve communication connection to transmit data through the cloud electric power information processing unit. The cloud electric power information processing unit is built in an area information communication channel according to the working task and the working demand, conducts transmission management on image information and sound information, enables monitoring personnel in the monitoring center service area to be like directing operation in the field in person and acquire field operation information inreal time, guides operation and ensures the operation safety; and on the basis of data information saved by the cloud electric power information processing unit, experience can be provided for laterwork.

The embodiments of the invention provide a current backflow prevention circuit and an intelligent door lock system and belongs to the field of electronic equipment. The current backflow prevention circuit comprises a first current backflow prevention module, boost circuits and second current backflow prevention modules; the first current backflow prevention module comprises a first MOS transistorand a first control unit; each second current backflow prevention module comprises a second MOS transistor and a second control unit; the first current backflow prevention module is connected with a first power supply; the second current backflow prevention modules are connected with a second power supply; the first control unit can control the conduction or cut-off of the first MOS transistor according to the output voltage of the second power supply, so that backflow current can be prevented from being generated between the first power supply and the boost circuits; each second control unitcan control the conduction or cut-off of the corresponding second MOS transistor according to the output voltage of the second power supply, so that backflow current can be prevented from being generated between the second power supply and the boost circuits. With the current backflow prevention circuit and the intelligent door lock system of the invention adopted, current backflow caused by different potentials of multiple paths of power supplies can be avoided, energy consumption can be reduced, and the charging safety of equipment is ensured.

The invention relates to a spare power automatic switching device, in particular to an intelligent intertripping load spare power automatic switching device, and belongs to the technical field of power system relay protection. According to the technical scheme, the intelligent intertripping load spare power automatic switching device comprises a first voltage transformer, a second voltage transformer, a first current transformer and a second current transformer, wherein the first voltage transformer is used for collecting the voltage of a first 10 KV bus section, the second voltage transformer is used for collecting the voltage of a second 10 KV bus section, the first current transformer is used for collecting the current of an outgoing line connected to the first 10 KV bus section, and the second current transformer is used for collecting the current of an outgoing line connected to the second 10 KV bus section; the first voltage transformer, the second voltage transformer, the first current transformer and the second current transformer are all connected with a load spare power automatic switching device body. The intelligent intertripping load spare power automatic switching device is compact in structure and convenient to operate, can collect transformer loads and outgoing line loads in real time, can guarantee the safe and reliable spare power automatic switching movement, and can guarantee continuous power supply and power supply safety of a user.

The invention relates to a leakage blocking protective circuit. The leakage blocking protective circuit comprises a detection comparison module (A), a detection time-delay module (B), a blocking circuit module (C) and a signal output module (D), wherein an input end of the detection comparison module (A) is connected with a peripheral detected equipment insulation resistor so as to detect insulation performance of the detected equipment insulation resistor, comparing a detected equipment insulation resistor value and an insulation critical value and then outputting the detected equipment insulation resistor value. The detection time-delay module (B) is connected with an output end of the detection comparison module (A) so as to prolong detection time of the detection comparison module (A). The blocking circuit module (C) is connected with the output end of the detection comparison module (A) and feeds back output signals of the detection comparison module to the input end of the detection comparison module (A) to form blocking. The signal output module (D) is connected with the detection time-delay module (B) so as to output passive contact signals to ban power transmission to a major loop of the detected equipment and to achieve leakage of electricity blocking protection of the detected equipment. The leakage blocking protective circuit can output the passive contact blocking signals and guarantee security of power supply.

The invention relates to a current transformer disconnection identification method, differential protection method and device for an electric reactor. The current transformer disconnection identification method includes judging whether current transformer disconnection judgment start conditions are met or not; if the starting conditions are met, judging whether the following conditions, including(1) the zero sequence current of a home terminal of the electric reactor is not zero and either phase of phase current is zero after disconnection judgment is started; (2) the zero sequence current ofthe other end of the electric reactor is zero and three phases of phase current are all not zero when the disconnection judgment is started; (3) the zero sequence current of the head end of the electric reactor is zero when the disconnection judgment is started, are met or not; determining disconnection of the current transformer for the electric reactor after a set delay time if the above conditions are met. According to the invention, whether disconnection of the current transformer occurs or not is identified according to disconnection and failure features of the current transformer. Besides, the head end voltage of the electric reactor is introduced for auxiliary judgment. Therefore, the disconnection of the current transformer can be judged accurately for the electric reactor and basis is provided for reliable action of differential protection.

The invention relates to a wireless network system, concretely relating to an MESH network system capable of adjusting power supply power automatically. The MESH network system comprises a power device and a power supply system. The power device comprises a processor module, a memory module, a peripheral equipment interface module, and a network interface module. The power supply system comprises a power supply management chip and a power supply power control module. The power supply power control module comprises a POE power transformer and an optoelectronic coupler. The power supply management chip adjusts output power of the POE power transformer according to a feedback signal. The MESH network system has the following advantages that: according to work power of each power device, the power supply system of the MESH network system adjusts power of a DC power supply automatically, the power supply is subjected to filtering, an interference signal is removed, and POE power supply security and equipment stabilization are ensured.

The invention discloses a lithium iron phosphate battery self-rescue system and method. The lithium iron phosphate battery self-rescue system comprises a charging unit, a power supply, an upper computer, a control unit, a switch matrix unit, a standby battery, an analog-to-digital conversion unit, a battery pack, a voltage sampling unit, a current sampling unit and a temperature sensor. By applying the lithium iron phosphate battery self-rescue system and method provided by the invention, the charge and operation states of the battery can be predicted according to parameters such as battery voltage, current and temperature detected in real time, the operation state of the battery can be judged, the battery pack can be self-rescued when a single battery breaks down, and a faulty battery can be replaced with the standby battery. Comprehensive depth perception of a transformer substation direct-current battery pack system can be realized, accurate and rigorous operation and maintenance protection measures are provided, stable operation of the battery pack is ensured, and power supply safety is ensured.

The invention discloses a power supply system for power system monitoring equipment. The power supply system comprises an inductive power taking module, a solar power supply module, a battery and a power management module, wherein the power management module controls a first switch to switch off when energy of the inductive power taking module or the solar power supply module is greater than energy required by a load; and the power management module controls a first switch to switch on when energy of the inductive power taking module and the solar power supply module is less than energy required by the load, so that the battery supplies power to the load. The power supply system provided by the invention adopts the power supply method of combining inductive power taking, solar power supplyand battery, preferentially uses the power of the inductive power taking module and the solar power supply module and then uses the power of the battery, thus ensures the power supply continuity, reduces the number of battery replacements, and brings convenience to the staff; in addition, due to the participation of solar power supply, the cost of power supply is reduced.

The invention discloses a distribution transformer heavy overload prediction method and system based on a Prophet-LSTM combinatorial algorithm. The method comprises the steps of obtaining and preprocessing historical load data of a distribution transformer; determining influence factors having correlation with the heavy and overload load values of the distribution transformer as characteristic factors for prediction of the distribution transformer; decomposing the load data of the distribution transformer into a trend component, a periodic component and a data mutation item component; and respectively establishing a corresponding prediction model for each component for prediction, and integrating predicted values of each component to obtain a predicted value of the load data of the distribution transformer. The invention provides a new algorithm of the distribution transformer load data cleaning and processing method, the periodicity, the missing property and the continuity of the data are considered, the data can be restored to the maximum extent, and the preprocessing precision of the data is improved.