751 results about "Secondary circuit" patented technology

The invention discloses a DC voltage divider parameter anomaly detection method based on harmonic characteristics, and the method comprises the steps: deploying an isolation type voltage sensor at a bus of a DC power transmission system, carrying out the voltage sampling through combining with an ADC, carrying out the data buffering and preprocessing, extracting a fundamental wave component and a target harmonic component through the fast Fourier transform, and calculating the harmonic distortion rate. And constructing a low-voltage arm capacitance and harmonic distortion rate model based on a voltage divider secondary circuit equivalent circuit and an energy distribution principle, and calibrating the low-voltage arm capacitance and harmonic distortion rate model. And designing a multi-objective optimization scheduling algorithm based on energy storage capacity and capacitance characteristics, and realizing dynamic power distribution and harmonic suppression of the system. And after abnormal triggering, the system automatically loads a capacitance compensation coefficient, adaptively adjusts algorithm parameters in combination with a measurement loop PI control link, reduces a harmonic amplification effect, and ensures that a measurement error is within an acceptable range. Harmonic monitoring precision and capacitance compensation optimization capability of the direct-current power transmission system are effectively improved, and stable operation of the system is guaranteed.

The invention relates to an electrical equipment fault monitoring and positioning method and system based on data analysis, and belongs to the technical field of electrical equipment monitoring. The method comprises the following steps: sensing a transient traveling wave signal of a fault current by adopting a traveling wave detection technology to determine an initial fault area; acquiring state data of the secondary equipment in the fault area through mapping of the secondary equipment in the fault area; constructing a secondary loop connection model based on the configuration file, and designing an action sequence rule base to verify the action logic and time sequence matching of a regional data centralized protection device, a circuit breaker and a communication link in real time; based on logic verification, action triggering conditions are extracted to be fused with the regional data set; and inputting the fault feature vector into a classification model for fault identification by obtaining the classification model. According to the invention, through traveling wave detection, EEMD decomposition, data synchronization and logic verification, feature information related to the fault is accurately extracted, and through data fusion and real-time learning, the fault identification precision and efficiency are improved.

The invention discloses an airport ground air conditioning unit multi-system energy-saving control method and system, and the method comprises the steps: collecting refrigerant flow data, temperature monitoring data and load demand data of an airport air conditioning system, recognizing a phase change boundary, extracting a gas-liquid conversion point, and carrying out enthalpy value coupling in combination with superheat degree distribution to generate a phase change energy field; identifying heat transfer bottleneck points based on the phase change energy field, generating an equivalent thermal resistance network, and extracting heat capacity characteristic parameters to construct a thermal response path diagram; refrigerant shunting analysis is carried out to extract primary and secondary loops, and an optimal distribution point is identified to generate a load balance matrix; reconstructing a compressor adjusting curve, and identifying a high-efficiency operation interval to generate a frequency conversion adjusting sequence; determining an energy storage window period, and obtaining a dynamic buffer threshold to construct a peak clipping and valley filling instruction set; and an execution deviation track is monitored, the optimal convergence path is recognized, self-adaptive correction is conducted, an energy-saving control instruction is generated, and intelligent multi-system coordination efficient energy-saving control over the airport ground air conditioning unit is achieved.

The invention discloses a current transformer real-time state diagnosis system based on Internet of Things, which relates to the technical field of electrical equipment state diagnosis and comprises a reference construction module, a disturbance excitation module, a modeling identification module, a driving unwrapping module, a self-adaptive setting module and a closed-loop control module, in the operation process of a secondary winding loop of the current transformer, a nanosecond time synchronization reference is established, a phase reference baseline is locked, current vector trajectories are continuously collected based on the time synchronization reference and the phase reference baseline, and a discrete phase residual image is constructed. According to the method, through high-precision time synchronization, phase disturbance excitation, sparse modeling identification, driving unwrapping and self-adaptive setting control, hysteresis oscillation of the secondary circuit of the current transformer is accurately identified and suppressed, the fault diagnosis accuracy and the system stability are remarkably improved, and the limitation of a traditional method in the aspects of identification sensitivity and response capability is broken through.

The invention discloses a comprehensive testing device for a high-voltage circuit breaker, and the device comprises a main control module which is connected with a power control module, a secondary detection module, a jump sampling module, and an auxiliary power module. The secondary detection module is respectively connected with the jump sampling module, the port protection module and the heavy load connector; the auxiliary power supply module is connected with the power supply control module and the jump sampling module. The port protection module is connected with the time test port. The power supply control module is connected with the jump sampling module, the heavy load connector, the sensor port, the external synchronization port and the return resistance test port. The invention further discloses a comprehensive testing method for the high-voltage circuit breaker. According to the comprehensive testing device, the functions of circuit breaker mechanical characteristic testing, circuit breaker secondary loop detection and circuit breaker loop resistance testing are integrated into the same device, the circuit breaker can be detected only by completing wiring between the circuit breaker and the comprehensive testing device, operation is convenient, and the testing result is accurate and is not affected by the personnel level.

The invention discloses a low-voltage power distribution anti-misoperation device which comprises an anti-reverse power transmission module, an anti-misoperation module, a power regulation anti-misoperation auxiliary module, an interaction control screen and a state logic switching module. The invention discloses a low-voltage power distribution anti-misoperation method and device, and the method and device can effectively eliminate the above problems through an anti-reverse power transmission module, an anti-misoperation module and a power adjustment anti-misoperation auxiliary module, have the functions of preventing reverse power transmission and preventing power failure of a user caused by manual operation, and have a locking function when a line does not meet a loop closing condition. On the basis that an original secondary loop is provided with three locks and two keys, three heat reverse connection points are added, the device keeps the original three-lock and two-key protection function of a power supply company, and the intelligent heat reverse loop closing operation function is achieved. Therefore, the five-prevention function under the condition that the electric operation cannot be realized due to the defects of the device or the electrical secondary circuit can be met.

The invention discloses a bidirectional CLLC resonant converter with a wide input and output voltage range, and relates to the technical field of bidirectional DC / DC converters in the field of switching power supplies. According to the bidirectional CLLC resonant converter, bidirectional switching bridge arms are added to a primary circuit and a secondary circuit in a conversion main circuit respectively; the control circuit performs pulse frequency control on a switching tube in the LLC resonant network and also performs duty ratio control on the bidirectional switching bridge arm circuit, so that the gain range of the resonant converter can be further widened on the basis of performing pulse frequency control on the LLC resonant network, and meanwhile, the whole-process soft switching can be realized, and the reliability of the resonant converter is improved. And the efficiency of the converter is improved.

A safety circuit for a high-voltage electrical traction system comprising a plurality of electric machines. The safety circuit comprises a primary high voltage interlock loop (HVIL) circuit configured to be connected to a battery and for each of the plurality of electric machines, a secondary high voltage interlock loop (HVIL) circuit, wherein each secondary HVIL-circuit is controlled by a corresponding switch unit configured to break the secondary HVIL-circuit if a fault in a corresponding electric machine is detected, and wherein the switch unit comprises a trigger device configured to break the primary HVIL-circuit if the switch unit is opened.

A method and circuit for controlling a bidirectional resonant direct-current converter are provided. The method includes obtaining an input and / or output electrical parameter of the converter; determining respective delay time periods of bridge arms in the secondary circuit based on the input and / or output electrical parameter and a desired gain of the converter; determining a switching frequency to be greater than a resonant frequency of the resonant tank based on the input and / or output electrical parameter and a preset reference signal; and turning off, in response to a secondary resonant current of the converter reaching zero, corresponding switching transistors of the switching transistors in the secondary circuit immediately after the respective delay time periods starting from a zero-crossing point; and turning on other switching transistors complementary to the turned-off switching transistors in the secondary circuit immediately after a dead time.

The invention discloses a 24-hour uninterrupted electric energy monitoring method for secondary circuit voltage drop, relates to the technical field of electric energy metering, and solves the problems that errors exist in electric energy metering and fault early warning and positioning are not timely. The method comprises the following steps: 1, carrying out on-site investigation on a monitoring position, and determining the position and the number of monitoring points; 2, carrying out 24-hour uninterrupted on-line real-time metering or detection on a detected point by arranging an abnormal mode self-identification module; 3, electric energy data of the electric power system is monitored in real time through a secondary circuit electric energy monitoring module, and the secondary circuit electric energy monitoring module comprises the steps that 4, voltage and current signals output by a monitoring point are collected through an LoRa / NB-IoT module, the monitored data information is transmitted to a monitoring center or a cloud platform in real time at a transmission interval less than or equal to 1 minute; according to the invention, the electric energy monitoring capability is greatly improved.

The invention discloses a nuclear power plant secondary side cleanliness evaluation and radiation shielding method. The method comprises the following steps that S1, whole secondary circuit system equipment of a steam generator is washed; s2, full-coverage cleanliness inspection is carried out in the range from a filter screen of the electric main water feeding pump system to the secondary side of the steam generator, and meanwhile, if foreign matter is found, a cleaning tool is used for picking up the foreign matter; s3, evaluating the cleanliness condition, and if the cleanliness is qualified, ending; if the cleanliness is not qualified, returning to the step S1; s4, if the foreign matter falls off after the steam generator runs, stopping the equipment, and filling the secondary side of the steam generator with water to a preset position for reducing the radiation dose; and S5, picking up foreign matters by using a cleaning tool. Full-coverage cleanliness inspection is carried out in the range from the filter screen of the electric main feed pump system to the secondary side of the steam generator, effective verification of the secondary loop foreign matter flushing effect and radiation shielding when necessary are achieved, and foreign matter remaining on the secondary side of the steam generator is avoided.

The invention provides a secondary side open circuit monitoring and protection system of a current transformer, which relates to the field of current transformers and comprises an open circuit monitoring module, an open circuit protection execution module, a signal output module and a monitoring terminal, in the real-time mode, when the secondary side loop of the current transformer has an open-circuit fault, the open-circuit monitoring module can quickly and accurately identify that the voltage value of the secondary side is abnormally increased, and once the voltage value exceeds a preset open-circuit voltage threshold value, a control signal is immediately output. The open circuit protection execution module responds to the control signal and automatically switches on a first wiring terminal and a second wiring terminal on the secondary side of the current transformer, so that a secondary side loop is effectively switched on again, potential safety hazards such as high-voltage discharge and rapid heating caused by open circuit are avoided, and an execution action signal is output at the same time. The system is also provided with a signal output module, and the signal output module can respond to an execution action signal and output an open circuit monitoring signal, thereby achieving the real-time monitoring of an open circuit fault.

The embodiment of the invention provides a multi-output isolated power supply, which comprises a power transformer comprising a single primary side coil and a single secondary side coil; a switch driving circuit coupled to the primary coil to output a driving voltage to the primary coil based on the input voltage; a rectification circuit coupled to the secondary coil and configured to rectify a voltage across the secondary coil to output a first DC voltage at a first rectified voltage output end and a second DC voltage at a second rectified voltage output end; and an output unit coupled to the first rectified voltage output terminal and the second rectified voltage output terminal, the output unit comprising one or more low dropout linear regulator circuits, where an output terminal of a predetermined low dropout linear regulator circuit is coupled to the secondary circuit ground, the output unit is configured to output at least one positive voltage and at least one negative voltage with a voltage at an output terminal of a predetermined low dropout linear regulator circuit as a reference.

An AC-AC converter is provided. The AC-AC converter includes a primary circuit, a secondary circuit, a transformer, a resonant tank, and a controller. The primary circuit includes four bidirectional switches, each including upper and lower switches connected back-to-back and capable of operating in four quadrants in a voltage-current plane. The first and fourth bidirectional switches operate synchronously, and the second and third bidirectional switches operate synchronously. When the input voltage is greater than a predefined threshold voltage, the first and second lower switches are maintained in an on state, and the first and second upper switches operate with PWM signals and are complementary to each other. When the input voltage is smaller than an additive inverse of the predefined threshold voltage, the first and second upper switches are maintained in the on state, and the first and second lower switches operate with PWM signals and are complementary to each other.

A power stage includes a control device and a power transistor, the control device comprising a primary circuit comprising: a control module able to generate a control current, a primary circuit malfunction detector able to detect a malfunction, a pulse transformer comprising a primary winding connected to the primary circuit, comprising a secondary winding connected to the secondary circuit, magnetically coupled to the primary winding and able to generate, from the control current, an induced pulse current making it possible to drive the power transistor, a secondary circuit comprising: a power and fault detection controller able to detect a malfunction of the secondary circuit or of the power transistor, the power and fault detection controller being able to communicate the malfunction of the secondary circuit or of the power transistor to the primary circuit malfunction detector.

The present invention discloses a nanocrystalline current transformer with DC component resistance and a method for using the same, comprising: a current transformer having a magnetic core hole extending from front to back in the middle of the front side of the current transformer. The device is provided with a secondary-side disconnection detection and protection mechanism, which effectively prevents the internal magnetic field imbalance of the transformer caused by the disconnection of the secondary circuit, avoids the core magnetic flux saturation and the generation of potential high electromotive force, thereby protecting the transformer itself and peripheral equipment, and reducing the risk of power system failures such as fire or short circuit. At the same time, a live conductor centering fixing mechanism is provided to ensure the stable centering position of the conductor in the transformer core hole, optimize the magnetic field distribution, reduce magnetic leakage, significantly improve the accuracy and stability of current measurement, and reduce measurement fluctuations introduced by conductor shaking, providing more accurate data support for harmonic analysis, fault detection, and power quality monitoring of the power system.

The invention belongs to the technical field of switching power supplies, and provides a multi-output flyback converter with a low cross regulation rate, which comprises a primary side loop comprising a switching tube and a primary side winding of a transformer, and the switching tube is used for controlling the energy transfer of the transformer; the secondary loop comprises a main output loop, a first secondary output loop and a second secondary output loop, the main output loop comprises a secondary winding of the transformer, and the secondary winding of the first secondary output loop is led out from the secondary winding of the main output loop through a tap; a secondary winding of the second secondary output loop is connected with an inductor; two ends of the inductor are connected with an energy absorption loop in parallel; and the feedback control loop is used for acquiring the sampling voltage of the main output loop, comparing the sampling voltage with the reference voltage, and controlling the output voltage of multi-path output by controlling the duty ratio of a switching tube. According to the flyback converter, the low cross adjustment rate of multi-path output of the flyback converter is realized, and mutual interference among the multi-path output is avoided.

The invention discloses an all-in-one power supply device, a power assembly and an electric vehicle, and relates to the technical field of new energy automobiles. The all-in-one power supply device comprises a vehicle-mounted charger circuit, a three-phase inverter circuit and a switch unit. The vehicle-mounted charger circuit comprises a primary side circuit, a resonant cavity and a secondary side circuit, the primary side circuit is used for converting alternating current output by an alternating current power supply into direct current, the primary side circuit is further used for carrying out power conversion on the direct current together with the resonant cavity and the secondary side circuit, and the secondary side circuit is used for charging a power battery of an electric vehicle. The three-phase inverter circuit is used for receiving power supplied by the power battery and supplying power to a driving motor of the electric vehicle. And the switch unit is used for selectively conducting connection between the middle points of the two bridge arms of the secondary circuit and the resonant cavity or between the middle points of the two bridge arms of the three-phase inverter circuit. The secondary side circuit of the single-stage vehicle-mounted charger is reused to supply power to the driving motor, reuse of a high-specification power tube is achieved, power density is improved, the size and weight of the all-in-one power supply device are reduced, and cost is saved.

The embodiment of the invention discloses a pressure control method and system for a once-through steam generator of a nuclear reactor, and relates to the technical field of nuclear power. Determining power deviation according to the operation power and the secondary circuit load; according to the power deviation, the rated power corresponding to the nuclear reactor and the rated feed water flow corresponding to the once-through steam generator in the nuclear reactor, pressure regulation information is determined; and adjusting the pressure of the once-through steam generator according to the pressure adjusting information. According to the embodiment of the invention, a PID controller is not needed in the process of determining the pressure regulation information, but the pressure regulation information determined based on the power deviation directly acts on the feed water flow regulation valve, so that rapid and accurate OTSG pressure control can be realized.

The invention discloses a zero-sequence current acquisition and analysis device and method for a power secondary circuit, and belongs to the field of power systems. The device comprises a current transformer, a temperature sensor, a front-end analog filter, an ADC, a rear-end digital filter, a self-adaptive wave trap, a processor and an alarm. Wherein the output end of the current transformer is connected to the processor through the front-end analog filter, the ADC and the rear-end digital filter in sequence; and the processor is also respectively connected with the temperature sensor and the alarm. According to the invention, real-time acquisition and early warning of the zero-sequence current are realized, and high precision and stability of an acquisition result in a full temperature range are ensured at the same time.

The utility model discloses an R290 heat management system based on secondary loop integrated waste heat utilization, relates to the field of electric automobile heat management, and aims to solve the problems that a heat management system in the prior art is high in cost, large in heat transfer loss, incapable of coping with an extremely low temperature environment and insufficient in single-core refrigerating capacity. A six-way water valve and a seven-way water valve are combined with a three-way valve to form a heat management pipeline, the heat management pipeline exchanges heat with an R290 circulation pipeline, a water-cooling condenser and a chiller battery cooler can be fully operated, a system connecting pipeline and a fluid flow direction are flexible and controllable, the control precision is high, a cold air core body and a warm air core body can be connected in series during refrigeration by changing pipeline connection, and the refrigeration efficiency is improved. Therefore, double-core refrigeration is carried out, and the refrigeration capacity is high; by proportionally adjusting the cooling liquid flow of the two loops, accurate temperature control after liquid mixing is realized, temperature impact on the battery is avoided, and the heat exchange efficiency is higher.

The invention discloses a circuit breaker intelligent comprehensive detector and a detection method in the technical field of circuit breaker intelligent comprehensive detectors. The circuit breaker intelligent comprehensive detector comprises a central unit control / acquisition module, an AC voltage / current output module, an excitation signal module, a contact signal module, an insulation test module and a circuit breaker test module. The central unit control / acquisition module is respectively connected with other modules and is used for distributing instructions to each module, acquiring and conditioning test data signals and evaluating the comprehensive state of the circuit breaker; the alternating voltage / current output module is used for applying excitation to a coil of the voltage comparison relay or the current comparison relay; the excitation signal module is used for applying excitation to the relay coil and the circuit breaker coil; the contact signal module is used for testing the performance of a relay contact; the insulation test module is used for carrying out an insulation test on a secondary circuit of the circuit breaker; the circuit breaker test module is used for testing mechanical characteristics of the circuit breaker.

The utility model relates to a system device for secondary loop dosing, which relates to the field of secondary loop dosing and comprises an ammonia source end, a water source end, at least two ammonia metering devices connected in parallel and at least one dosing end. The ammonia source end is connected with at least two ammonia metering devices which are connected in parallel through a pump and a switch valve; the water source end is connected with at least two ammonia metering devices which are connected in parallel through a switch valve; the at least two ammonia metering devices which are connected in parallel are connected with at least one dosing end through a switch valve. According to the system device provided by the utility model, the dosing system of the secondary loop is redesigned, and the ammonia metering equipment connected in parallel is adopted, so that the defect of unstable operation of the secondary loop caused by fluctuation of the dosing amount in the switching process is avoided, the usability of thermodynamic system equipment is improved, the service life of the thermodynamic system equipment is prolonged, and long-term and stable operation of a power plant is ensured.

The invention relates to a system (10) for de-icing the blades (14) of the propeller (12) of an aircraft, the system comprising an H-bridge inverter device (40); a rotary transformer (22) comprising a main primary winding (26), a primary measurement winding (28), and a secondary circuit (30) delivering a secondary alternating voltage (Vs); a rectifier device (50); a de-icing device (20); a control device (60) configured to control the switching elements of the inverter device in an out-of-phase manner, using the value of the voltage (Vpm) across the terminals of the primary measurement winding, measured during a measurement interval of predetermined duration starting at the instant (t11,t33) when the inverter device switches from a controlled state to a short-circuit state.

The invention provides an online power supply switch mutual inductor fault detection method and system, a medium and a product, and relates to the technical field of online monitoring and fault diagnosis of power equipment, and the method comprises the steps: generating a synchronous triggering instruction at the zero crossing point moment of the power frequency current of a mutual inductor; in response to the instruction, injecting an excitation pulse into a secondary circuit of the mutual inductor and synchronously acquiring a feedback voltage to obtain a mixed transient signal; extracting a pure response waveform only containing a high-frequency component from the mixed transient signal to carry out multi-resolution time-frequency transformation, and calculating and outputting a multi-dimensional feature vector representing a winding state; inputting the multi-dimensional feature vector into a pre-trained neural network model for classification operation to obtain a fault classification probability of the current transformer state; and comparing the fault classification probability with a preset confidence threshold to generate a fault diagnosis result of the mutual inductor. By implementing the method, the recognition sensitivity of the system on early weak faults and high-frequency distribution parameter changes of the mutual inductor can be improved.

An electronic power switching circuit comprising a primary circuit with two conducting rails having a first end and a second end, wherein the conducting rails at the first end are configured to be connected to the two phases of an external AC power supply and a secondary circuit with two conducting rails having a first end and a second end, wherein the conducting rails at the first end are connected to the conducting rails at the second end of the primary circuit via electromechanical relays and interposed between the conducting rails and the conducting rails, respectively, wherein said relays are electrically actuated via a control unit, where the control unit controls the switching of the relays depending on the zero crossing time of the load current and / or the power supply voltage.

The invention provides a multifunctional electric energy metering simulation device and a design method thereof, and relates to the technical field of electric power metering management, the device comprises a cabinet body, and a special transformer metering module, a load control module and a secondary loop module which are arranged on the cabinet body; the special transformer metering module comprises a three-phase intelligent electric energy meter, a special transformer acquisition terminal, a one-way switch, a combined test junction box and a terminal strip; the load control module is connected with the special transformer metering module, and the load control module comprises a terminal strip, an indicating lamp, a shunt trip switch and a voltage division button; the secondary circuit module is connected with the load control module, and the secondary circuit module comprises a voltage transformer, a current transformer, a primary wire and a secondary wire. According to the invention, through simple wiring, a real on-site metering mode of a special transformer customer can be realized, all-around training of personnel on-site skills and simulation and reproduction of various on-site faults can be realized, and the investigation and treatment capability of personnel on-site faults is improved.

The invention discloses a transformer substation secondary circuit drawing intelligent processing method and system, belongs to the technical field of electric power system digitization, and aims to solve the problems that the missing detection and false detection rate of old fuzzy drawings is high, a deep learning model lacks topological semantic understanding, full-process automation is insufficient, and structural management is lacked in conventional secondary circuit drawing processing. According to the core scheme, the method comprises the steps of segmenting an image through a U-Net network to generate masks, generating a structured topology table in combination with a primitive database, converting the structured topology table into nodes and directed edges with electrical attributes, constructing a queriable graph database integrating version management, rule check and a layout optimization algorithm, and finally generating a standard format drawing. According to the scheme, the primitive recognition and topology analysis precision is improved, deep mapping from images to electrical logic is achieved, full-process automation is achieved, version tracing and rule verification are supported, and standardized drawings are produced.

The invention relates to the technical field of new energy automobile heat management, in particular to an R290 integrated secondary loop energy efficiency improving heat management system for an electric automobile, which comprises a refrigerant side loop and a water side loop, the refrigerant side loop is filled with an R290 refrigerant and used for achieving refrigerant circulation phase-change heat exchange. The water side loop comprises a passenger compartment water loop, a battery water loop and a motor water loop; the passenger compartment water loop is filled with a coolant and is used for exchanging heat with a passenger compartment and adjusting the temperature of the passenger compartment; the battery water loop is filled with a coolant and is used for carrying out heat management on the battery and realizing absorption and transfer of battery heat; the motor water loop is filled with a coolant and is used for cooling the motor and maintaining the working temperature of the motor; the coolant in the water side loop and the R290 refrigerant in the refrigerant side loop are located in different pipelines.

The invention discloses a complete-cycle health maintenance method, system and device for secondary circuit equipment and a medium, and the method comprises the steps: obtaining the operation data of the secondary circuit equipment, and dividing the operation data into an initial data set and an incremental data set; constructing an initial health prediction model by using the initial data set, and predicting the residual service life of the secondary circuit equipment; according to an incremental learning algorithm, updating the initial health prediction model by using an incremental data set to obtain an updated health prediction model; and performing health state evaluation and residual service life prediction on the secondary circuit equipment by using the updated health prediction model, thereby realizing complete-cycle health maintenance of the secondary circuit equipment, automatically adjusting an incremental learning strategy according to the change of an equipment operation environment, and improving the adaptability of the system.