194 results about "Single-phase electric power" patented technology

The invention belongs to the technical field of power grids, and particularly relates to a hydrogen fuel cell grid-connected inverter fault test and ride-through method. Comprising the following steps: S1, simulating three-phase symmetrical voltage drop, inter-phase voltage drop and single-phase voltage drop of a power grid through a low-voltage fault generation device; s2, collecting the voltage of a power grid through a high-precision voltage sensor, and when the voltage of the power grid drops, judging whether the system needs to carry out low-voltage ride through at the moment according to a distributed energy low-voltage ride through curve; and S3, when the system needs to carry out low-voltage ride-through, a dual-second-order generalized integrator pre-filtering phase-locked loop (DSOGI-PLL) is combined with grid-connected point voltage full-feedback compensation, negative-sequence components generated by symmetric and asymmetric drop of the power grid voltage are eliminated, and current impact suppression and negative-sequence current elimination are realized. The problem of power grid synchronization under the condition of power grid voltage drop is finally solved.

The invention relates to the technical field of electric energy metering error compensation, in particular to an electric energy metering error compensation method, device and system, and the method comprises the steps: collecting a single-phase electric energy signal of a secondary side of a power grid transformer, and uniformly dividing the single-phase electric energy signal into each section of metering signal sequence; calculating high-frequency unsteady-state energy to quantify distortion by extracting first-order and second-order quasi-steady-state components of a metering signal sequence; meanwhile, impact pulses in the dynamic components are recognized, impact characteristics are analyzed through clustering, and the nonlinear impact disturbance degree is comprehensively calculated; the fundamental wave separation strength of each section of metering signal sequence is calculated, the initial step length factor of the LMS filtering algorithm is dynamically adjusted, effective separation of fundamental waves and distortion signals is achieved, and therefore electric energy metering error compensation is completed. The method aims at solving the problem that the metering precision of a traditional fixed step length factor is reduced under the power grid nonlinear load high permeability working condition, and the accuracy and reliability of electric energy metering are ensured.

The invention relates to a multi-structure self-adaptive electric energy meter non-power-cut replacement device and a use method. The multi-structure self-adaptive electric energy meter non-power-cut replacement device comprises a control host connected with a single-phase electric meter; the wire inlet side and the wire outlet side of the single-phase electric meter are respectively connected with switches of the same type or different types, the switch of the wire inlet side is connected with a power supply side socket of the control host through a wire inlet electricity taking module, the switch of the wire outlet side is connected with a user side socket of the control host through a wire outlet electricity taking module, and the control host and the single-phase electric meter form a parallel bypass; the lower part of the single-phase ammeter is provided with a connection terminal area, the connection terminal area is provided with four ammeter buses which are arranged at intervals, and each ammeter bus is locked with the single-phase ammeter through a wire locking screw. The connection terminal area is detachably connected with a short circuit module, the short circuit module is connected with the control host and the locking wire screw, the adjacent ammeter buses are locked or loosened by adjusting the locking wire screw, the single-phase ammeter is seamlessly switched from an original circuit to a parallel bypass, and meanwhile the passing electric quantity is continuously metered.

An electrical conductor monitoring system for single or multi-phase conductors is described. The monitoring system may be configured to monitor the health of a conduction system based on multi-phase sequences and / or current magnitude and angle vectors of multi-phase or single-phase current. In one example, the monitoring system includes an insulation health monitoring system having an input and output measurement devices, the input measurement device disposed at an input end of the electrical distribution system and structured to measure three-phase input currents, the output measurement device disposed at an output end of the electrical distribution system and structured to measure three-phase output currents; and a monitoring device communicatively coupled to the measurement devices and structured to receive the three-phase input and output currents from the measurement devices and determine a state of the insulation system based on the three-phase input and output currents. Other embodiments are described.

The application discloses a novel lung lobe-shaped magnetic shielding partial discharge detection device and a detection method. The device comprises an isolation transformer, a bushing, a detection electrode and a partial discharge instrument. A single-phase power supply is connected with a reactor in parallel, and then connected with an input end of the isolation transformer. One end of an output end of the isolation transformer is connected with the bushing, and then connected with the detection electrode. The other end of the output end of the isolation transformer is grounded. A grounding end of a to-be-detected lung lobe-shaped magnetic shielding is grounded, and the grounding end of the to-be-detected lung lobe-shaped magnetic shielding is connected with the partial discharge instrument. The to-be-detected lung lobe-shaped magnetic shielding and the detection electrode are correspondingly arranged to form an equivalent capacitor and are coupled and connected. The application can be used to determine whether there is a defect in the lung lobe-shaped magnetic shielding by performing a partial discharge test on the lung lobe-shaped magnetic shielding before the lung lobe-shaped magnetic shielding is assembled into a transformer. The application has the characteristics of high test efficiency and low applied voltage, and greatly improves the first-time pass rate of the transformer product provided with the lung lobe-shaped magnetic shielding.

The utility model discloses a damping single-phase electronic electric energy meter box, which comprises an electric energy meter box module, and the electric energy meter box module comprises a box body frame. The convenient disassembly and assembly module comprises a guide groove formed in the center of the front face of the inner wall of the box body frame, a guide block is slidably arranged in the guide groove, the front face of the guide block is sleeved with a mounting plate, sliding grooves are formed in the two opposite sides of the inner wall of the guide groove, and sliding blocks are fixedly arranged on the upper portions of the two sides of the guide block; the sliding rod extends into the sliding groove and abuts against the lower end; the device further comprises a damping module, the damping module comprises movable grooves symmetrically formed in the ends of the two opposite sides of the inner wall of the box body frame, micro hydraulic dampers are arranged at the rear ends of the inner walls of the movable grooves, one ends of the micro hydraulic dampers are sleeved with movable blocks, and movable plates are fixed to one ends of the multiple movable blocks. The electric energy meter can be conveniently disassembled and assembled at a low position, time and labor are saved, simplicity and convenience are achieved, use is convenient, requirements are met, and the use effect is improved.

An electrical converter may include AC terminals, a first and second DC terminal, and converter modules. Each of the converter modules has an AC node. The second DC terminal forms a common node of the converter modules. A connection between the AC nodes of the converter modules and the AC terminals is reconfigurable allowing the electrical converter to operate according to a first mode of operation converting between a first AC signal having a first plurality of phase voltages and the DC signal, in which the converter modules are grouped in first groups, and according to a second mode of operation converting between a second AC signal having a single-phase voltage and the DC signal, in which the converter modules are rearranged in second groups. The electrical converter is configured to operate multiple converter modules assigned to a same group of the first groups and the second groups in parallel.

The application discloses a kind of wind power variable pitch system power grid fault detection method, system, terminal and medium, it is related to wind power generation technical field, its technical scheme main point is: by obtaining three-phase line voltage value detected by pitch driver, and based on the cosine law relationship between line voltage and phase voltage Mapping relationship is established, without increasing any external hardware voltage measurement module, only using the line voltage detection capability that driver has inside, i.e. By setting upper and lower threshold and comparing with line voltage, according to the preset judgment logic, it can be identified whether there is single-phase voltage anomaly in power grid and locate abnormal phase.Cose law reveals the inherent vector relationship between line voltage and phase voltage, when a certain phase voltage drops or rises, the two line voltages containing the phase will change simultaneously, while the third line voltage remains unchanged, by comparing the relative size of the three line voltages and the threshold, the abnormal phase can be uniquely determined.

The utility model relates to an electricity larceny prevention mutual inductor which comprises a base, a secondary junction box and a mutual inductor set, the mutual inductor set comprises two single-phase current mutual inductors and two single-phase voltage mutual inductors, and the mutual inductors are sequentially connected through connecting copper bars or wires; a terminal strip and a secondary binding post are arranged in the secondary junction box, lugs are arranged on the two sides in the secondary junction box, and internal threaded holes and internal threading holes are formed in the lugs; a concave lug is arranged on the inner side of a box cover of the secondary junction box, an outer threaded hole and an outer threading hole are arranged on the concave lug, the box cover is detachably fixed on the secondary junction box in the mode that the inner threaded hole and the outer threaded hole are fixed through screws, and a lead sealing anti-theft rope is arranged between the inner threading hole and the outer threading hole in a penetrating mode. According to the mutual inductor capable of preventing electricity larceny, the secondary junction box end is structurally optimized, private connection and electricity larceny can be effectively prevented in the mode that lead sealing is conducted firstly and then cover closing and fixing are conducted, meanwhile, the modular combination mode is adopted, a certain single-phase mutual inductor is convenient to disassemble, assemble, maintain and replace, and the use and maintenance cost is reduced.

The utility model belongs to the field of voltage transformers, and particularly relates to an outdoor secondary cast aluminum junction box single-phase voltage transformer. A secondary connecting terminal is arranged at the bottom of the side wall of a shell; a cast aluminum junction box is arranged at the bottom of the side wall of the shell; the secondary connection terminal is led out from the cast aluminum junction box, and the cast aluminum junction box is connected with the shell through a cast aluminum junction box fixing bolt. And the shell is formed by vacuum casting of outdoor epoxy resin. A fully-closed and fully-insulated structure is adopted, shielding treatment is carried out inside the structure, and the primary coil, the secondary coil and the iron core are packaged inside the shell. The voltage transformer is simple in structure, easy to install, good in safety, high in secondary protection level, low in material consumption and low in equipment cost, the safety of the voltage transformer is improved, the protection level can reach IP55, and the partial discharge level meets the international requirement.

This invention relates to the field of single-phase power regulation technology, and more particularly to a multifunctional single-phase power regulator, comprising: a main circuit module for connecting the power supply and load and setting power regulation devices in series; an internal power supply and voltage regulation module that draws power from the main circuit and performs current limiting, rectification, and voltage regulation; a control and regulation module that generates control signals based on input signals and main circuit parameters under its power supply; a trigger suppression and synchronous start module that prohibits triggering before the power supply is stable or synchronization conditions are met; a protection monitoring module for monitoring main circuit parameters and prohibiting triggering in case of abnormalities; and a heat dissipation and maintenance module with an independent disassembly and assembly structure. In this invention, by drawing power from the main circuit and uniformly supplying power to the control and trigger modules for coordinated operation, control conditions are synchronously established when the main circuit is turned on, thereby improving the problem of false triggering and inconsistent start-up that easily occurs in traditional single-phase power regulators due to asynchronous power supply between the main control and the main circuit.

1. The name of the design product: single-phase electric energy meter calibrator. 2. The use of the design product: used for measuring the voltage, current, electric energy pulse and other signals of the electric energy meter, calculating the measurement error of the detected electric energy meter, and used for electric energy meter calibration. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: design 1 perspective view 1. 5. Design 1 is designated as the basic design. 6. Other circumstances that need to be explained: design 1 and design 2 are similar designs.

The application discloses a method for anti-electricity stealing based on abnormal connection of user single-phase electric meter, and relates to the technical field of electric power metering, which comprises the following steps: installing sampling units on the incoming line side and the outgoing line side of the user single-phase electric meter, synchronously collecting single-phase voltage, current, neutral line current and temperature and humidity signals of the meter box, and generating synchronous electrical data sequences through standardization and time stamp alignment. Single-phase voltage and current fundamental phase angles are calculated based on voltage and current instantaneous value sequences, and a phase angle difference map is constructed. The effective value of the neutral line current is calculated, and an abnormal flag sequence is generated in combination with a normal load reference range. The environmental temperature and humidity abnormal fluctuation period is extracted. The above-processed features are input into a connection mode recognition model to identify suspected electricity stealing connection mode categories, improve the accuracy of meter connection abnormality recognition, and reduce misjudgment. The method can effectively identify meter connection abnormalities and improve the accuracy of electricity stealing identification.

The application discloses a kind of three-phase unbalance treatment method, system, equipment and medium, belong to power quality treatment technical field, method includes: acquisition electrical parameter solution adjustment value;Single-phase electric energy is converted into direct current buffer storage;According to synchronous phase reconstruction distribution, the direct current electric energy is generated compensation current injection power grid.The system includes parameter acquisition and solution module, electric energy conversion and buffer module, reconstruction distribution module, compensation injection module.The application establishes target current solution logic by coupling three-phase unbalance degree and single-phase grid-connected feedback, utilizes direct current link to absorb single-phase fluctuation energy, and continuously injects three-phase compensation current in phase synchronous mode.The strategy will random single-phase power supply be converted into treatment tool, realizes cross-phase active reconstruction and smooth impact-free grid connection.

The utility model discloses an alternating-current variable-frequency power supply capable of realizing three-phase-to-single-phase full-power output, which comprises a main board, a slow starting module, a three-phase EMI (Electro-Magnetic Interference) filter, an R-phase output isolation transformer, an S-phase output isolation transformer, a T-phase output isolation transformer and a three-to-single interlocking switching contactor, the main board is provided with an output voltage sampling end pin, an output current sampling end pin, an SPP-107, an operation panel removing end pin, a driving signal end pin and a slow start removing end pin, and the main board is connected with the slow start module through the slow start removing end pin. The power supply does not need to additionally purchase single-phase power supply equipment and can be directly switched; compared with a voltage regulator scheme, a variable-frequency power supply is used for supplying power and is isolated from a mains supply power grid, so that the anti-interference performance is improved; an interlocking mechanism is arranged between the single phase and the three phases, so that the single-phase output and the three-phase output are prevented from being mistakenly connected, and the tested equipment is prevented from being damaged.

The application discloses a single-phase electronic electric energy meter and relates to the technical field of electric energy meters.The single-phase electronic electric energy meter is provided with a wiring rack, when wiring work needs to be performed on a plurality of wire bodies, the wire bodies can be inserted into corresponding rectangular assembly racks, then the arc-shaped locking pieces are moved downward by pressing the locking slide rods, the wire bodies are locked with the wiring copper sheets, the locking of the wire bodies is completed through the cooperation of the concave limiting racks and the locking racks, the locking work on the end portions of the wire bodies is cancelled by pulling the unlocking end heads upward through the cooperation of the slide rods and other components, the wire bodies and the wiring copper sheets can be conveniently replaced, wiring effect can be ensured, wiring and wire removal work can be conveniently performed on wire bodies of different sizes, and the assembly convenience and the subsequent maintenance convenience of the equipment are improved.

1. The name of the design product: single-phase electronic electric energy meter. 2. The use of the design product: for electric energy measurement, data analysis, data transmission and remote control. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

1. The name of the design product: three-wire branch module for lighting. 2. The use of the design product: used for making branch joints when three wires are used for power distribution, leading out phase, zero and ground single-phase power supply for lighting lamps. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.

A multi-phase circuit control method includes following steps: generating a first control signal and a second control signal to a first phase circuit respectively by a controller; generating a third control signal and a fourth control signal to a second phase circuit respectively by controller; outputting a two-phase voltage to a output terminal of a power conversion device by first phase circuit and second phase circuit; changing a duty cycle of third control signal to turn off a first switch of a primary side circuit and a rectifier side circuit of second phase circuit by controller when controller is configured to detect that output voltage is lower than a first preset voltage; changing a duty cycle of fourth control signal to conduct a second switch of a primary side circuit and a rectifier side circuit of second phase circuit; and outputting a single-phase voltage to output terminal.

The application discloses a kind of temperature field simulation calculation method and device based on transformer model, by obtaining and according to transformer parameter, transformer three-dimensional one-grade model is constructed, wherein the transformer three-dimensional one-grade model includes core, single-phase winding and oil tank;Based on the model single-phase current of the transformer three-dimensional one-grade model is calculated, the model single-phase current calculated is input into the transformer three-dimensional one-grade model, and the single-phase loss density of transformer is obtained;The model simulation parameter of transformer is set, according to the model simulation parameter and the single-phase loss density, the transformer three-dimensional one-grade model is iterated and simulated, and the transformer temperature field simulation result is obtained.Compared with prior art, the technical scheme of the present application simplifies the existing transformer model, solves the problem of large amount of calculation, difficult mesh partitioning and long calculation time in the existing three-dimensional full model, and can improve the simulation calculation efficiency of transformer three-dimensional one-grade model.

The invention discloses an early warning method, device and system for an electricity stealing behavior of a single-phase ammeter, a medium and a product, and belongs to the field of power systems, and the method comprises the steps: obtaining the first live line current, the first zero line current and the electricity utilization condition of a plurality of single-phase ammeters in a to-be-detected region; determining a plurality of first electricity larceny risk users based on each first live wire current and each first zero wire current, determining a plurality of second electricity larceny risk users based on each first electricity larceny risk user, and calculating current characteristics of each first electricity larceny risk user and each second electricity larceny risk user, determining a plurality of third electricity larceny risk users based on the current characteristics, and inputting the electricity consumption conditions corresponding to the third electricity larceny risk users into a preset electricity larceny evaluation model to obtain a plurality of electricity larceny scores; and determining a target electricity stealing user based on each electricity stealing score, and performing early warning on electricity stealing of a single-phase ammeter of the target electricity stealing user. According to the invention, the early warning efficiency and accuracy of the electricity stealing behavior of the single-phase ammeter can be improved.

1. The name of the design product: electronic single-phase electric energy meter PCB board. 2. The use of the design product: used for single-phase electric energy meter, PCB board with electric energy metering, communication and storage functions. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: front view. 5. The design product is a thin product, omitting the left view; the design product is a thin product, omitting the right view; the design product is a thin product, omitting the top view; the design product is a thin product, omitting the bottom view.

The application discloses a control system of a three-phase alternating-current brake controlled by a single-phase power supply on a crown block, and relates to crown block control technology. The control system comprises an uninterruptible power supply, a frequency converter and a control module. The uninterruptible power supply is used for outputting 220V alternating-current power when the crown block is powered off; the frequency converter is used for receiving 220V alternating-current power output by the uninterruptible power supply and outputting 380V three-phase alternating-current power to a control loop of a hoist brake; the control module is used for collecting an electric quantity value reserved by the uninterruptible power supply; when the electric quantity value is lower than a set electric quantity threshold value, a trigger signal for forcibly starting the hoist brake is preset; then the lowest relative height of a heavy object is collected, and when the lowest relative height of the heavy object is greater than a set suspension safety height, the trigger signal is output to forcibly start the hoist brake to release the brake of the hoist machine and lower the heavy object. The application can safely and quickly electrically control the hoist brake when the crown block is powered off, lower the heavy object to a safe position, and effectively prevent the occurrence of equipment and personal safety accidents.

The invention discloses a control circuit, a control method and an operation control device of an air conditioning system and an air conditioner. The control circuit of the air conditioning system comprises a three-phase power supply port; the three-phase PFC module is connected with the three-phase power supply port, and the three-phase PFC module comprises a first positive bus and a first negative bus; the single-phase power supply module is connected with the single-phase power supply port through a switch component, the single-phase power supply port is any one of the three-phase power supply ports, and the single-phase power supply module comprises a second positive bus and a second negative bus; wherein the first positive bus is connected with the second positive bus through the first diode, and the first negative bus is connected with the second negative bus through the second diode. When the compressor operates abnormally, the energy value fed back to the first positive bus and the first negative bus by the compressor is absorbed through the first diode and the second diode, the bus voltage is prevented from rising and overshooting, the stability of the bus voltage is improved, meanwhile, the power device module is prevented from being damaged by overhigh bus voltage, and the service life of the control circuit is prolonged.

The present disclosure relates to a direct-current / alternating-current conversion circuit and an energy storage and conversion apparatus. The direct-current / alternating-current conversion circuit comprises: three single-phase conversion circuits, a first end of each single-phase conversion circuit being a direct-current end, a second end of the single-phase conversion circuit being an alternating-current end, and the single-phase conversion circuit being used for mutual conversion between a direct-current current and a single-phase alternating-current current. When the second ends of the three single-phase conversion circuits are shorted, the alternating-current phases of the three single-phase conversion circuits are the same, and when the second ends of the three single-phase conversion circuits are not shorted, phase differences exist among the alternating-current phases of the three single-phase conversion circuits. The direct-current / alternating-current conversion circuit can be compatible with a three-phase power grid and a single-phase power grid, so that an energy storage device using the direct-current / alternating-current conversion circuit has good flexibility during grid connection.

1. The name of the design product: electronic single-phase AC energy meter PCB board. 2. The use of the design product: used for single-phase energy meter, PCB board with energy metering, communication and storage functions. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: front view. 5. The design product is a thin product, omitting the left view; the design product is a thin product, omitting the right view; the design product is a thin product, omitting the top view; the design product is a thin product, omitting the bottom view.

The application discloses a single-phase electric device and a method for improving starting torque of the single-phase electric device. The power output unit has a worm, which is axially displaced when the power output unit starts or stops. A worm wheel is connected with the worm and is driven to rotate by the worm. There is an idle stroke between the worm and an output shaft. After the power output unit starts, the worm drives the worm wheel to rotate relative to the output shaft to eliminate the idle stroke, and then the worm wheel is connected with the output shaft in power transmission. After the power output unit stops, the worm is axially reset and drives the worm wheel to rotate relative to the output shaft to restore the idle stroke. The method makes the motor, the worm and the worm wheel rotate before the output shaft, so that the starting torque of the output shaft is larger. The application forms the idle stroke between the worm wheel and the output shaft, and makes the motor run under no load and then outputs power from the output shaft, so that the starting torque of the single-phase electric device is improved.

The application discloses a power converter, a control method and related devices, comprising: two power conversion circuits, each of the power conversion circuits comprising a four-switch Buck-Boost circuit; the DC side of each of the power conversion circuits is used for connecting a DC source, and the AC side of each of the power conversion circuits is used for connecting a split-phase load or a single-phase power grid; and the AC side of the power converter is connected to the positive electrode of the DC side of the power converter at N points. The power converter provided by the application is a single-stage converter, and therefore has high power density and conversion efficiency, and can be applied to a single-phase scene or a split-phase scene, or simultaneously applied to a single-phase and split-phase scene.

The invention discloses an electricity larceny prevention method based on abnormal metering wiring of a user single-phase ammeter, which relates to the technical field of electric power metering and comprises the following steps of: synchronously acquiring single-phase voltage, current, neutral current and meter box temperature and humidity signals by arranging sampling units on a wire inlet side and a wire outlet side of the user single-phase ammeter; a synchronized electrical data sequence is generated by standardized and timestamp alignment. Calculating a single-phase voltage and current fundamental wave phase angle based on the voltage and current instantaneous value sequence, and constructing a phase angle difference map; calculating a neutral current effective value and generating an abnormal mark sequence in combination with a normal load reference range; and extracting the abnormal fluctuation time period of the environment temperature and humidity. And inputting the processed features into a wiring mode identification model, and judging the type of a suspected electricity stealing wiring mode, thereby improving the metering wiring abnormity identification precision and reducing misjudgment. According to the method, metering wiring abnormity can be effectively identified, and the electricity larceny judgment accuracy is improved.