20results about How to "Restore power" patented technology

The invention discloses a transformer fault intelligent diagnosis method and system, and the method comprises the steps: reading a longitudinal differential protection action switching value from transformer fault recording, according to the fault recording information, calculating rated current of each side of the transformer, longitudinal three-phase differential current amplitude, voltage and current amplitude of each side and zero-sequence voltage and zero-sequence current amplitude of each side; and combining different criteria to intelligently identify fault types such as a non-internal fault, a three-phase symmetric fault, a single-phase earth fault, a two-phase earth fault, a two-phase interphase short circuit and an interturn fault of the transformer, and fault sides and fault phases. According to the invention, the fault type and the fault position of the transformer can be rapidly and automatically positioned, manual fault analysis is assisted or replaced, and an intelligent automatic solution is provided for accident handling of the transformer fault in an engineering field.

The invention relates to a snowflake-type power distribution network self-healing processing logic optimization method, system and device and a medium, and belongs to the technical field of power system automation, and the method comprises the following steps: constructing a protection cooperation rule of snowflake-type power distribution network self-healing logic and a low-voltage photovoltaic grid-connected circuit breaker; optimizing the centralized logic of the master station; and constructing a distributed rapid self-healing logic based on the protection cooperation rule and the optimized master station centralized logic so as to optimize the self-healing processing logic of the snowflake type power distribution network. According to the invention, by introducing the direction signal and the direction relay, the problem that the relay protection system misjudges the fault current of multiple power supply ends is effectively solved, and wrong circuit breaker tripping events are reduced. The optimized fault processing logic can isolate a fault area more quickly, power supply to a non-fault area is recovered, and the reliability and stability of a power grid are improved.

The invention provides a fault positioning method and device for a box-type substation, and the method comprises the steps: obtaining a topological structure of the box-type substation, and recognizing all switch nodes and terminal equipment nodes; according to the current flow direction and the electric energy transmission path, establishing a directed graph model of the box-type substation; a sensor array is deployed on the switch node and the terminal equipment, electrical parameters of a deployment area are monitored in real time, fault detection and signal analysis are carried out according to a set threshold value, and a fault signal is determined; according to the current flow direction in the topological structure and a fault signal in the sensor data, analyzing the current flow direction at the fault moment, determining a monitoring area where the fault signal is located, and preliminarily positioning a fault area; and according to the change rate of the voltage and the current of the preliminarily positioned fault area, the distance from the fault point to the nearest sensor is calculated by combining cable parameters and transmission delay, the fault position is accurately positioned, and rapid and accurate positioning of the fault is realized.

The invention discloses a backup power supply automatic switching control method and system based on voltage double criteria, and the method is applied to a transformer substation, and comprises the steps: enabling a backup power supply automatic switching safety intertripping device to collect a voltage signal, a protection action signal and a switching signal of a corresponding low-voltage side bus; judging according to the voltage signal of the low-voltage side bus, the protection action signal and the switching signal, generating a logic state signal, and sending the logic state signal to other spare power automatic switching safety intertripping devices of the transformer substation and corresponding spare power automatic switching safety intertripping devices of other transformer substations; the backup power automatic switching safety intertripping device performs comprehensive logic judgment according to the voltage signal, the protection action signal and the switching signal of the backup power automatic switching safety intertripping device and the received logic state signal, and determines backup power automatic switching operation modes under different power supply modes; the method can ensure the reliability of power supply.

The present disclosure relates to a method, system, device and medium for optimizing the self-healing processing logic of a snowflake-type distribution network, and belongs to the field of power system automation technology. The method comprises the following steps: constructing the protection coordination rules of the snowflake-type distribution network self-healing logic and the low-voltage photovoltaic grid-connected circuit breaker; optimizing the master station centralized logic; constructing a distributed fast self-healing logic based on the protection coordination rules and the optimized master station centralized logic to optimize the self-healing processing logic of the snowflake-type distribution network. The present disclosure effectively solves the problem of the relay protection system misjudging the fault current of multiple power supply terminals by introducing directional signals and directional relays, and reduces the erroneous circuit breaker tripping events. The optimized fault processing logic can isolate the fault area more quickly, restore power supply to the non-fault area, and improve the reliability and stability of the power grid.

The invention discloses an element importance degree evaluation method and device suitable for fault repair, terminal equipment and a storage medium, when a power supply coefficient of a power supply element is obtained, the direct power supply capability of the power supply element on a load element is considered, and the influence of the load element with a high importance degree value on the power supply reliability of the power supply element is also considered; and based on the power supply coefficient, the performance parameter and the ideal solution set, obtaining an importance evaluation result of the power supply element, and further obtaining a fault repair priority of the power supply element. The actual power supply effect of the power supply elements in the power grid and the power supply reliability of the important load elements are considered, so that the power supply elements with the maximum power supply reliability for the important load elements are higher in corresponding fault repair priority, and it is ensured that when the power grid breaks down or the load fluctuates, the power supply reliability of the power supply elements is higher. Important load elements related to the power supply elements with high importance can continuously obtain preferential power supply, and the overall power supply capability and reliability of the power grid are guaranteed.

The utility model discloses a terminal structure and a distributed DTU power distribution terminal, and relates to the technical field of power monitoring and control, and the terminal structure comprises a fixed plugging unit which comprises a fixed cylinder and a plugging assembly; the connecting and embedding unit comprises a connecting cylinder and an embedding cylinder; the intelligent power distribution unit comprises a terminal housing, a terminal board, a mainboard system, a power supply assembly, a signal lamp, a display and a button. The beneficial effects of the utility model are that the connection cylinder is matched with the embedding cylinder to realize tight clamping of a wire and ensure the connection stability of the wire, and the fixed plugging unit is matched with the connection cylinder to realize the connection strength of a wire joint and equipment and ensure the current transmission effect; through multi-interface information acquisition and cooperation with an LINUX system to develop and process data, the device has the functions of relay protection, safety, local feeder automation, intelligent distribution and the like, the network type local distribution function can be met through peer-to-peer communication between devices, and rapid fault point positioning, fault isolation and power supply recovery are achieved.

The present invention discloses a power failure detection and power supply protection circuit, comprising: a sampling module, a comparison module, a switch module and a control module. The sampling module samples the input end of the circuit and outputs a sampled voltage; the comparison module compares the sampled voltage with a reference voltage, and outputs a switch control signal from a first output end and a result feedback signal from a second output end according to the comparison result; the switch module controls the connection relationship between the first output end and the input end according to the switch control signal, and outputs a latch control signal through the second output end; the comparison module is also used to determine whether to enter a latched state according to the latch control signal; the control module is used to output a reset signal once at a preset interval when the result feedback signal indicates that the power supply fails; the reset signal is used to release the latched state of the comparison module. The present invention can restore power supply in time on the basis of ensuring power supply safety, and realize reliable power supply of the power supply.

The present invention relates to the field of substation equipment fault location, and discloses a GIS equipment fault rapid location system and method. The system includes a signal acquisition module, a protection action behavior analysis and diagnosis module, and an ultra-high frequency partial discharge online monitoring module. The present invention analyzes and diagnoses the tripping information of the equipment in the station, outputs the GIS fault time, phase difference and location range information to the GIS ultra-high frequency online monitoring system, and retrieves the amplitude and discharge rate signals of the GIS ultra-high frequency sensor within the corresponding time, corresponding phase and corresponding location range through a dual-mode synchronous clock module. The GIS gas chamber with the greatest possibility of fault is determined by a signal strength amplitude location method. On the one hand, the number of GIS ultra-high frequency sensors retrieved is reduced, and on the other hand, the influence of interference signals is avoided, which significantly improves the positioning accuracy and efficiency of GIS equipment.

The embodiment of the invention discloses a distributed power supply system self-healing control method. According to the scheme, when the power supply system breaks down, the power distribution terminal configured for the power supply switch at the downstream of the fault point controls the power supply switch connected with the power distribution terminal to be switched off, an isolation success signal is generated, and the isolation success signal is sent to the power distribution terminal configured for each interconnection switch; the power distribution terminal configured for each interconnection switch receives the isolation success signal, and sends power switch characteristic data of the power point switch and interconnection switch characteristic data of the interconnection switch to the power distribution terminal configured for the fault isolation switch, so that the fault isolation switch determines a target interconnection switch capable of realizing an optimal self-healing path; and the serial number of the target interconnection switch is sent to the power distribution terminal configured by each interconnection switch, so that the power distribution terminal configured by the interconnection switch consistent with the serial number of the target interconnection switch controls the interconnection switch connected with the power distribution terminal to be switched on, and power supply of a non-fault area of the power supply system is recovered.

The invention discloses an active power distribution network fault recovery method and device, equipment and a storage medium, relates to the technical field of power systems and automation thereof, can accurately identify fault properties on the basis of identifying the fault types, and improves the power supply reliability and adaptability of a power distribution network under new energy access. The method comprises the following steps: acquiring fault point current information and / or fault point voltage information output by a distributed power supply in an island state of the active power distribution network; fault type identification is carried out on the fault point according to the fault point current information and / or the fault point voltage information, fault types are obtained, and the fault types at least comprise a low-resistance grounding short circuit fault, a high-resistance grounding short circuit fault and an interphase short circuit fault; carrying out fault property identification on the fault category to obtain a fault continuous feature; and determining a fault recovery strategy according to the fault type and the fault continuous characteristic, and carrying out fault recovery on the active power distribution network through the fault recovery strategy.

The present invention discloses a method for judging a short-circuit fault in a distribution network based on a phase voltage amplitude variation at a load end, comprising the following steps: S1, installing a voltage monitoring device at the load end, collecting phase voltage data in real time, and generating a voltage amplitude variation; S2, preprocessing the data, eliminating noise interference, and generating preprocessed voltage variation data; S3, using a high-order statistical spectrum subtraction method to analyze the preprocessed data, identifying abnormal components in the signal, and preliminarily judging a short-circuit fault; S4, confirming and recording the abnormal position through a quantum tunneling effect detection algorithm; S5, using a generalized maximum entropy principle to perform time series analysis and confirm the fault; S6, accurately locating the fault point based on the zero scattering theory; S7, classifying the fault type according to the minimum entropy productivity principle; S8, dynamically adjusting the fault isolation scheme based on generalized predictive control. The present invention improves the accuracy and response speed of fault detection, and is suitable for fault diagnosis and processing of complex power systems.

The invention belongs to the technical field of power distribution network phase-to-phase fault direction identification, and particularly relates to a fault discrimination phase transient state quantity selection method suitable for phase-to-phase fault direction identification. The method comprises the following steps: S1, measuring the voltage and current at a protection position, and if the voltage and current meet duset / dtgt; [delta] 1 or diset / dtgt; delta 2, protection starting; s2, three-phase fault voltage and current at a protection position are collected, and a three-phase current detail coefficient is calculated; and S3, calculating the modulus maximum of the detail coefficient of each phase of current, obtaining the modulus maximum of the detail coefficient of the three-phase current in the data window, determining a fault discrimination phase, and identifying a fault by using the sampling data of the fault discrimination phase. The method provided by the invention is easy to implement, can reliably judge the fault direction under the condition of interphase short circuit, does not depend on power supply characteristics, only needs single-end electrical quantity, is not limited by communication channels, and has good generalization performance.

The invention discloses an automatic feeder detection system which comprises a power distribution network equivalent model construction unit, a fault feature analysis unit, a real-time data acquisition unit, a real-time data transmission unit, a fault identification unit, a fault positioning unit, a result output unit, an automatic feeder isolation unit and a power supply recovery unit. The power distribution network equivalent model construction unit is used for constructing an equivalent model, the fault feature analysis unit analyzes fault types and features, the real-time data acquisition unit acquires real-time data, the real-time data transmission unit transmits the data to the fault identification unit, and the fault identification unit detects faults. The fault positioning unit determines the position of a fault point, the result output unit outputs a result, the automatic feeder isolation unit takes isolation measures for the fault, and the power supply recovery unit performs power supply recovery; faults can be quickly found and positioned, the fault positions are timely isolated, power supply is recovered, the safety and stability of the power distribution network are improved, and the operation quality of the power distribution network is ensured.

The invention discloses a delay preprocessing rapid breaker and an arc-free breaking control circuit and method, the breaker is used for a direct current circuit, and the arc-free breaking control circuit and method apply the breaker. The breaker comprises a direct current input end, a direct current output end and a conductive path which can be communicated with the direct current input end and the direct current output end; the conductive path is provided with a first open circuit and a second open circuit; the first open circuit is provided with a preprocessing structure which is controlled by a preprocessing control signal or a conduction control signal to conduct the first open circuit at a high resistance value or a low resistance value; the second open circuit is provided with an on-off structure which is conducted in a natural state and is controlled by an on-off control signal to disconnect the second open circuit. According to the scheme, the novel breaker is provided, the breaker can conduct pretreatment breaking before main breaking, the voltage at the two ends of a main breaking line is reduced, therefore, electric arcs are avoided, and rapid breaking is achieved.

A method, system, product, and medium for coordinated control of distributed power sources are disclosed. The method includes: real-time detection of the power output decline rate of photovoltaic power plants and wind turbines, current grid load data, power demand, and the remaining capacity and discharge power of energy storage batteries; under high-risk conditions, calculating the real-time load characteristics of each load and prioritizing all loads; isolating non-critical loads ranked in the priority order within a preset low percentage range from the main grid and issuing isolation notifications to their load sides; when insufficient power is detected, injecting electrical energy into the grid by controlling the power supply or discharge status of controllable loads; calculating the current power gap, and controlling the start-up of inactive generator units when the power gap exceeds a preset threshold. Implementing the technical solution provided in this application improves the dynamic response capability of the power grid under distributed power fluctuations and load surges.

The invention discloses a dual-power switch power distribution system, a control device and method thereof and an air conditioner, and the device comprises a main power supply and a standby power supply which are connected to a load side circuit breaker after passing through a dual-power switch system; the standby power supply is also connected to the first connecting end of the bypass system; the second connecting end of the bypass system is connected to a circuit breaker of a second-level load and a common end of the second-level load; under the condition that short-circuit faults occur between the main power supply and the load-side circuit breaker and between the standby power supply and the load-side circuit breaker, the dual-power switch system disconnects the main power supply and the standby power supply, and the bypass system controls the standby power supply to supply power to the second-level load through the circuit breaker of the second-level load. According to the scheme, the bypass system is added to the dual-power switch power distribution system, the bypass system is used for supplying power to the second-level load, namely the important load when the short-circuit fault occurs between the dual-power switch and the load circuit breaker, and the reliability of the dual-power switch power distribution system is improved.

The invention discloses a circuit and method for detecting false opening and closing of a low-voltage air switch, and relates to the technical field of power distribution network low-voltage circuit maintenance, and the circuit comprises a low-voltage air switch, an indicating lamp connected with the low-voltage air switch in parallel, and a voltmeter connected with the low-voltage air switch in parallel. The indicating lamp is connected in the control loop, is connected in parallel with an auxiliary contact of the low-voltage air switch, and is used for displaying the state of the air switch. And the voltmeter is connected in the measuring loop and is used for measuring the voltage level of the circuit. The method has the beneficial effects that the workload is effectively reduced, and the maintenance work is ensured to be completed according to quality and quantity within the time limit specified by the plan, so that the lean management is really implemented; electricity testing and safety measures can be rapidly carried out, personal risks of high falling and electric shock caused by pole climbing electricity testing and safety measures are avoided, and the working efficiency of maintenance is improved.

The invention discloses a stage illuminating lamp capable of being switched and extended conveniently, and relates to the field of stage illuminating lamps, the stage illuminating lamp comprises a sliding rail, one side of the sliding rail is connected with at least one dislocation table, the other side of the sliding rail is fixedly connected with a driving table, two driving chains with opposite movement directions are arranged in the driving table in the length direction, and the stage illuminating lamp further comprises a moving table, the moving table is used for installing a stage illuminating lamp and can slide in the sliding rail, the moving table is provided with inserting block structures matched with the two driving chains in the direction facing the driving table, and the moving table further comprises a sliding plate which can push the moving table to the dislocation table. According to the invention, the telescopic rod is utilized to temporarily move the moving table which moves to the position corresponding to the dislocation table to the dislocation table, so that the moving table is dislocated from other moving tables on the track, the switching of the arrangement and combination modes of the stage lamps on the track is conveniently realized, and the convenient switching and extension of the stage lamps are realized at lower cost.

The utility model discloses a kind of waste glass multistage vibrating screen separation devices, including climbing conveyor, sieve box and controller;The conveyor belt of the climbing conveyor is provided with strong electromagnet, strong electromagnet both sides are provided with baffle, wherein the outside of right side baffle is provided with coding chip;The climbing conveyor below located sieve box rear side is provided with metal recovery tank;First scanner and magnetic stop signal transmitter are sequentially installed in the metal recovery tank right side close to sieve box, and magnetic stop signal receiver is arranged in the metal recovery tank left side;Second scanner and magnetic recovery signal transmitter are sequentially installed in the metal recovery tank right side far from sieve box, and magnetic recovery signal receiver is arranged in the metal recovery tank left side;The utility model is through setting strong electromagnet on the conveyor belt of climbing conveyor, then carry out multilayer screening to waste glass by sieve box, effectively remove metal impurities in waste glass, and meticulous screening to glass is realized.