49 results about "Phase selection" patented technology

The invention relates to the technical field of electric power, in particular to a vacuum circuit breaker and a phase selection closing control method, and the vacuum circuit breaker comprises a hybrid electromagnetic mechanism and a vacuum arc-extinguishing chamber; the hybrid electromagnetic mechanism comprises a permanent magnet closing assembly and an electromagnetic repulsion opening assembly, the permanent magnet closing assembly comprises double coils and a T-shaped movable iron core which are arranged in parallel, and a discharge loop is formed to drive a movable contact of the vacuum arc-extinguishing chamber to complete a closing action and maintain a closing state; the electromagnetic repulsion opening assembly comprises a static coil panel and a moving coil panel which are coaxially and oppositely arranged to form a reverse current repulsion loop so as to drive a moving contact of the vacuum arc-extinguishing chamber to complete an opening action and maintain an opening state, and the moving coil panel is connected with a T-shaped moving iron core of the permanent magnet closing assembly through an insulating guide rod; the vacuum arc-extinguishing chamber comprises a driving connecting rod, a moving contact and a static contact, one end of the driving connecting rod is connected with the moving contact, and the other end of the driving connecting rod is connected with the insulating guide rod. Therefore, the opening and closing speed of the vacuum circuit breaker is improved.

An active transmission type intelligent metasurface and a matching circuit applied to the intelligent metasurface, the circuit comprising: a receiving antenna for receiving an electromagnetic wave signal; a power amplification unit for amplifying the electromagnetic wave signal received by the receiving antenna; a phase coupling unit for modulating the amplified electromagnetic wave signal into electromagnetic wave signals with various phase differences; a phase selection unit for selecting an electromagnetic wave signal with a required phase difference from the electromagnetic wave signals with various phase differences; and a radiation antenna for radiating the electromagnetic wave signal with the corresponding phase difference; the intelligent metasurface comprises a plurality of active transmission intelligent metasurface units arranged periodically to form an N*M array, and each active transmission intelligent metasurface unit in the array comprises an active transmission circuit. The present application realizes the active amplification function which the existing transmission RIS structure does not have and has the 2-bit phase control function, and the present application has low design complexity, low deployment cost and good system performance.

The present application relates to the technical field of electrified railway control, and discloses a phase control closing method and a heavy haul locomotive circuit breaker, the method comprising: step one, establishing equivalent mathematical models for the heavy haul locomotive, traction substation, AT substation and traction network; step two, establishing a vehicle-network-station simulation model based on a MATALB / Simulink simulation platform; step three, obtaining the influence of different line loads on phase selection closing according to the vehicle-network-station simulation model; and step four, determining a phase control closing scheme and conducting test verification. The phase control closing and opening method of the heavy haul locomotive circuit breaker with the above structure can establish equivalent mathematical models for the heavy haul locomotive, traction substation, AT substation and traction network, and then establish a vehicle-network-station simulation model, analyze the influence of different line loads on phase selection closing, and determine a phase selection closing scheme according to the breakdown characteristics of the circuit breaker and the analysis results. The phase selection closing scheme determined through test verification can achieve the purpose of reducing the overvoltage of the closing system.

The application discloses a transformer on-load tap changer based on a phase selection technology and a gear switching method, which comprises a main circuit and a transition circuit connected with transformer winding taps, the main circuit comprises gear selection circuit and on-off circuit connected in sequence, the gear selection circuit comprises at least four relays for switching the working gear of the transformer; the on-off circuit is composed of vacuum circuit breaker VCB2, diode D2 and vacuum circuit breaker VCB4 connected in series; the transition circuit is formed by transition resistor R, vacuum circuit breaker VCB1 and diode D1 connected in parallel, and vacuum circuit breaker VCB3 connected in sequence, the transition circuit cooperates with the main circuit to realize the arcless switching of the transformer gear; all the vacuum circuit breakers are controlled to act by permanent magnet operating mechanisms, and the permanent magnet operating mechanisms are used to drive the vacuum circuit breakers to realize the fast on-off according to the voltage phase signal. The application controls the action of the vacuum circuit breaker by the phase selection technology and the conduction and cutoff characteristics of the diode, reduces the generation of arc, and prolongs the electric life.

The invention discloses a large-view-field polarization detection super lens based on an instrument matrix, and relates to the technical field of micro-nano optics and polarization detection. Comprising four sub-lens structures. A secondary phase distribution and global optimal phase screening strategy is adopted in the structural design, and a calibration method based on an instrument matrix is provided. According to the structure, different polarization components are spatially separated and focused, and polarization response of a system at different incident angles is accurately calibrated by using an instrument matrix, so that polarization detection in a large view field range of 120 degrees is realized. The invention has the characteristics of super compactness and high precision, and can be used for designing polarization detection, polarization imaging and the like in a large view field range.

The invention discloses a phase rotator in a spread spectrum clock generator and the spread spectrum clock generator, relates to the technical field of clock spread spectrum, and aims to solve the problems that the phase rotator of the spread spectrum clock generator in the prior art is not suitable for high-frequency signals and is high in power consumption. The phase rotator comprises a coarse adjustment loop and a fine adjustment loop. The coarse adjustment loop is connected with the fine adjustment loop; the coarse tuning loop is used for performing first phase segmentation on an input high-frequency differential clock signal to obtain multiple paths of modulation phase signals, and selecting a target single-path modulation phase signal from the multiple paths of modulation phase signals based on a phase selection signal; and the fine adjustment loop is used for performing second phase segmentation on the target single-path modulation phase signal to obtain multiple paths of high-resolution phase signals, and selecting the target single-path high-resolution phase signal from the multiple paths of high-resolution phase signals based on the phase selection signal. The invention is used for realizing the processing of the clock spread spectrum generator on the high-frequency clock signal and reducing the power consumption.

The application discloses a phase selector switch, which has multiple phases, each phase comprising a vacuum interrupter, a magnetic control mechanism and a transmission mechanism, the vacuum interrupter comprising a moving contact and a stationary contact, the magnetic control mechanism comprising a moving iron core and a stationary iron core, and the transmission mechanism comprising a connecting rod assembly, a breaking spring and an overtravel spring; the first end of the connecting rod assembly is rigidly connected to the moving contact, the second end of the connecting rod assembly is connected to the moving iron core in a follow-up mode, and the second end of the connecting rod assembly passes through the stationary iron core and the moving iron core, and the breaking spring and the overtravel spring are arranged in the middle section of the connecting rod assembly. The application has the beneficial effect that the connecting rod assembly passes through the magnetic control mechanism, so that an overtravel distance is formed between the connecting rod assembly and the magnetic control mechanism, and the overtravel value of the contact overtravel spring after the factory delivery can be observed and measured, and the wear condition of the vacuum interrupter contact in the phase selector switch can be found in time in the later period.

The embodiment of the invention discloses a transmission link control system and a transmission link control method. The system comprises: at least two sending links; wherein any sending link comprises a multi-phase generation circuit and a phase selection circuit of a frequency division clock; the multi-phase generation circuit is used for generating at least two clock sending phases and sending all the clock sending phases to the phase selection circuit; and the phase selection circuit receives all the clock sending phases sent by the multi-phase generation circuit, determines a target phase according to all the clock sending phases, and sends the target phase to the multi-phase generation circuit, so that the multi-phase generation circuit generates a synchronous clock signal according to the target phase. According to the embodiment of the invention, the time sequence deviation skew of the sending modules among different links is effectively and accurately controlled, the algorithm precision is improved, the calibration judgment time is shortened, and a solid foundation is laid for realizing accurate link synchronization and ensuring the correctness of received data.

The application discloses a method, medium and system for determining the closing speed of a phase-selected vacuum switch for closing a capacitive load, comprising: repeatedly performing multiple closing experiments on the fast vacuum switch at different closing speeds and at different closing phases under a power frequency voltage; collecting the minimum pre-breakdown voltage and the power frequency voltage corresponding to the closing process of each closing speed; drawing the curve of the minimum pre-breakdown voltage corresponding to each closing speed of the fast vacuum switch changing with time and the curve of the power frequency voltage changing with time; if the closing process corresponding to at least one closing speed meets a first preset requirement, selecting the smallest closing speed as the lower limit of the closing speed of the fast vacuum switch; and the first preset requirement is that the slope of the curve of the minimum pre-breakdown voltage changing with time is greater than the slope of the curve of the power frequency voltage changing with time at the same time. The application determines the minimum closing speed, and reduces the pre-breakdown high-frequency inrush current in the process of closing the capacitive load by the vacuum switch.

The present application relates to the technical field of power system relay protection, and especially to a mixed precision quantization method for single-phase ground fault line selection, comprising the following steps: S1, fault line selection data set preparation and basic model training; S2, channel level sensitivity evaluation; S3, channel sensitivity grading and prior construction; S4, mixed precision bit width proportion sequential search; S5, actor-critic reinforcement learning based bit width allocation; and S6, quantization perception training and parameter updating. The mixed precision quantization method for single-phase ground fault line selection realizes the target of "precision loss ≤ 3%, compression ratio ≥ 4 times, and inference time ≤ 200 ms" of the fault phase selection model through the design of "unbalanced sample enhancement-channel level sensitivity evaluation-reinforcement learning bit width allocation-quantization perception training-deployment adaptation verification", meets the real-time deployment needs of the power distribution network edge device, and improves the accuracy and timeliness of single-phase ground fault phase selection.

High linearity harmonic rejection mixers are disclosed herein. In certain embodiments, a mixer operates to mix a signal received at an input with a local oscillator signal from a local oscillator. The mixer includes a plurality of in-phase (I) signal paths and a plurality of quadrature-phase (Q) signals paths that are selectively activated by a plurality of clock signal phases of the local oscillator signal. For example, each clock signal phase selects a corresponding I signal path and Q signal path that are active for that clock signal phase. The mixer is implemented such that a total absolute current of the I signal path and the Q signal path is substantially constant for each of the clock signal phases.

The application discloses a fault phase selection method suitable for a high-voltage transmission line of a high-proportion new energy system, and comprises the following steps: S1, calculating the phase voltage and phase-to-phase voltage amplitude of a protection installation, the phase compensation voltage and phase-to-phase compensation voltage variation, and the zero sequence current amplitude; S2, if the zero sequence current amplitude is greater than a threshold value, entering S3; otherwise, entering S5; S3, if the intermediate value and the minimum value of the phase voltage amplitude meet a preset condition, determining that a single-phase ground fault occurs in the phase corresponding to the minimum value; otherwise, entering S4; S4, if the two phases corresponding to the minimum value of the phase-to-phase compensation voltage variation are different from the phase corresponding to the maximum value of the phase compensation voltage variation, and the preset condition is met, determining that a single-phase ground fault occurs in the phase corresponding to the maximum value; otherwise, determining that a two-phase ground fault occurs in the two phases corresponding to the minimum value of the phase-to-phase voltage amplitude of the protection installation; and S5, determining that a multi-phase fault occurs in the power grid. The single-phase fault and the multi-phase fault can be accurately distinguished.

The invention provides a harmonic wave testing device, a harmonic wave testing system and a harmonic wave testing method, the harmonic wave testing device comprises a coupler and a phase selector, the coupler is connected with an input port and an output port and is used for inputting a harmonic wave signal of a device to be tested to the harmonic wave testing device and then transmitting the harmonic wave signal out of the harmonic wave testing device. The phase selector includes a change-over switch and a plurality of transmission lines. One end of the change-over switch is connected with the coupler, the other end of the change-over switch comprises a plurality of change-over ports, any one of the plurality of change-over ports is connected with a transmission line, and the lengths of the transmission lines connected with at least two change-over ports are different. Different transmission lines in the phase selector can be selected to be connected to the test channel by controlling the change-over switch, so that the phase of the reflection coefficient of the input port is adjusted, and the harmonic test parameters of the harmonic test system are enriched. The switching speed is fast, the harmonic testing device does not need to be calibrated, and the performance is stable.

The invention relates to the technical field of state monitoring and fault diagnosis, in particular to an automatic detection system and method for a phase selection closing device based on an intelligent algorithm, and the method comprises the steps: a multi-mode sensing module applies an active excitation signal and obtains an active mechanical response signal when the device is in a standby state, and obtains a passive operation signal when the device is in a closing operation; the feature extraction module extracts active mechanical features and passive dynamic features respectively, and the active mechanical features and the passive dynamic features are spliced into target feature vectors; the deviation prediction module establishes an explicit degradation equation through a symbolic regression algorithm, inputs a target feature vector to obtain predicted closing time deviation and outputs abnormal early warning; and after receiving the early warning, the diagnostic analysis module deduces a device fault source based on a target feature vector and a Bayesian causal network. According to the invention, active harmonic detection is adopted when the device is in a standby state, and passive dynamic monitoring is carried out when the device is switched on, so that effective separation of pure mechanical characteristics and electromechanical coupling dynamic characteristics of equipment is realized.

The application discloses a non-isolated flexible interconnection equipment control method and system, and belongs to the technical field of power system distribution network fault control. The method comprises the following steps: starting fault detection based on zero sequence voltage ratio; distinguishing the fault side and the healthy side through zero sequence instantaneous power; inputting a zero sequence suppression strategy of the healthy side converter to eliminate cross-zone interference; injecting a 300Hz high-frequency signal into the fault side converter to realize parameter-independent fault phase selection; switching a proportional-resonance controller based on the phase selection result to execute an arc extinction strategy, controlling the neutral point voltage to be the negative value of the fault phase voltage, and reducing the fault point voltage to below 0.2kV. The application breaks through the limitation of traditional arc extinction devices relying on the neutral point, solves the zero sequence transmission problem of the non-isolated topology, realizes the full-automatic and rapid disposal of single-phase grounding faults, and has a 100% arc extinction success rate, and is suitable for intelligent distribution network construction.

The invention discloses a circuit breaker phase selection closing state detection method and device based on multi-mode signal analysis. The method comprises the steps that when it is monitored that the circuit breaker executes a phase selection closing action, voltage and current waveforms in the process that the circuit breaker executes the phase selection closing action are acquired; performing multi-mode signal analysis on voltage and current waveforms in the process of executing phase selection closing, and determining a voltage abrupt change value of each phase and a current abrupt change value of each phase; and when the voltage abrupt change value of each phase or the current abrupt change value of each phase is judged to meet the electrical quantity assessment condition, determining that the phase selection closing state of the circuit breaker is normal. Therefore, the method is rapid, accurate and good in practicability.

The invention relates to the technical field of relay protection, in particular to a distance protection method and device for creating fault states based on active regulation and control of a current converter and a medium, and aims at a single-phase earth fault and an interphase fault, two fault states are created in a mode of changing a positive sequence electrical quantity reference value of the current converter by utilizing high controllability of the current converter. Calculating equivalent positive-sequence impedance of an opposite-end system by using the characteristics that the zero-sequence network characteristics during a single-phase earth fault and the negative-sequence network characteristics during an inter-phase fault do not change along with a converter control strategy and combining fault boundary conditions; substituting into a fault loop equation, eliminating transition resistance in the equation, forming a quadratic unary equation only containing a fault distance unknown quantity, and solving to obtain a fault distance; and the distance protection device suitable for the converter access system is constructed by combining the direction element and the phase selection element. According to the method, the problem that a traditional distance protection algorithm is easily influenced by transition resistance and parameters in a converter access system can be effectively solved.

A fault phase selection method based on a high-frequency break variable comprises the following steps: after a protection element starting criterion is satisfied, extracting three-phase fault component voltage data 2.5 ms before and after a protection installation position starting moment, calculating break variable voltage of each phase at the protection installation position, and then obtaining a phase selection coefficient of each phase and zero-sequence and positive-sequence break variable voltage; grounding judgment, three-phase short circuit judgment and two-phase short circuit judgment are sequentially carried out, and fault phase selection is achieved. The method can quickly and reliably act, only needs to extract data 2.5 ms after a fault to carry out fault identification, and is high in protection speed and sensitivity.

Systems and techniques are provided for a polar transmitter using a reduced frequency modulation (FM) range. Baseband complex data can be converted into magnitude and phase components by a cartesian-to-polar conversion module. For each respective phase of the phase component, a phase selection can be determined from a plurality of phase selection candidates and used to generate a phase select parameter and a modified phase for the respective phase. A set of clock signals includes a clock signal with a frequency controlled by the modified phase, and one or more shifted clock signals with phase shifts relative to the clock signal. An input clock signal can be selected from the set using the phase select parameter. A power amplifier can be driven by the magnitude component according to the input clock signal to generate a RF signal for transmission by the polar transmitter on a wireless medium.

The application discloses a phase selection method based on a new zero sequence direction element and a new zero sequence current bipolarization criterion, and comprises the following steps: calculating zero sequence voltage and zero sequence current according to three-phase voltage vectors and three-phase current vectors at a protection installation point; calculating zero sequence compensation voltage, ground compensation voltage and phase-to-phase compensation voltage according to the zero sequence voltage, the zero sequence current and preset high-resistance distance protection setting values; determining a fault direction of the protection installation point according to the zero sequence voltage, the zero sequence current and a preset new zero sequence direction element criterion; in the case that the fault direction is a positive direction fault, determining a fault phase according to the three-phase current vectors and a preset sequence current absolute value phase selection element criterion; and determining a phase selection result according to the fault phase, the zero sequence compensation voltage, the ground compensation voltage, the phase-to-phase compensation voltage, a ground fault criterion based on a compensation voltage amplitude of a healthy phase, a zero sequence current phase selection criterion of phase compensation voltage polarization and a zero sequence current phase selection criterion of phase-to-phase compensation voltage polarization.

The invention relates to the technical field of alternating current filter phase selection opening fixed value optimization, in particular to a conventional direct current converter station alternating current filter phase selection opening target angle optimization method based on harmonic analysis. Comprising the following steps: extracting harmonic components in real time; selecting a characteristic harmonic current or a main characteristic harmonic current; according to the invention, the method can dynamically optimize the opening time according to the harmonic current condition monitored in real time, and compared with a fixed opening strategy, the method can better adapt to the harmonic characteristic change of the filter under different working conditions, and can improve the harmonic characteristic change of the filter under different working conditions. The accuracy and reliability of the opening operation are improved, and the problem of reignition and rebreakdown caused by early arc extinguishing under the condition that the opening distance of the contact of the circuit breaker is insufficient can be effectively avoided through adaptive adjustment, so that the service life of the circuit breaker is prolonged, and the safety and reliability of a power system are improved.

The application provides an equalizer and a chip, and relates to the field of artificial intelligence chips. The equalizer comprises a first-stage receiving circuit, which comprises a pre-stage amplification sub-circuit, a dynamic locking sub-circuit and a phase selection sub-circuit. The input end of the pre-stage amplification sub-circuit is electrically connected with the signal input end of the first-stage receiving circuit, the first output end of the pre-stage amplification sub-circuit is electrically connected with the first input end of the dynamic locking sub-circuit, the second output end of the pre-stage amplification sub-circuit is electrically connected with the second input end of the dynamic locking sub-circuit, the first output end of the dynamic locking sub-circuit is electrically connected with the first input end of the phase selection sub-circuit, the second output end of the dynamic locking sub-circuit is electrically connected with the second input end of the phase selection sub-circuit, and the first output end and the second output end of the phase selection sub-circuit are electrically connected with the signal output end of the first-stage receiving circuit. The application aims at improving the problems of large occupied area and high power consumption of the existing equalizer.

The application discloses a magnetic control mechanism, which comprises a shell, a static iron core, a dynamic iron core and a coil. The static iron core is arranged on the inner side of one end of the shell. The dynamic iron core is arranged in the shell and is matched with the static iron core. The coil is connected with the inner side of one end of the shell and is matched with the static iron core, so that the static iron core is locked in the shell. The coil is matched with the static iron core and the dynamic iron core. The application also discloses a phase selection switch. The application has the advantages that the static iron core and the dynamic iron core can be kept in the state of being attracted to each other by residual magnetism after the excitation current of the coil disappears, so that the closing state can be maintained without continuously inputting current into the coil by an external power supply, thereby saving energy. Meanwhile, the magnetic control mechanism is stable and has relatively low cost.

The method and system for selecting phases for single-phase grounding faults in distribution networks based on transient phase voltages calculates the integral of the squares of the analytical values ​​of the three-phase voltages after the fault in the first cycle, using this integral as the first-dimensional criterion. Based on the zero-sequence equivalent network parameters of the distribution network, second-dimensional and third-dimensional criters are established. Among the three surfaces constructed using the first, second, and third-dimensional criters, the phase corresponding to the lowest-level surface is selected as the phase selection result for the single-phase grounding fault in the distribution network. The first and second distance differences between the lowest-level surface and the other two surfaces are calculated respectively. When both the first and second distance differences are negative, the phase selection result is deemed correct, enabling phase selection for single-phase grounding faults in the distribution network within one cycle.

The invention discloses a self-recognition analysis method, device and equipment for a phase selection closing phase angle of a converter station, and the method comprises the steps: automatically recognizing a phase selection closing waveform through a waveform file, and recognizing a current abrupt change position, a voltage abrupt change position, a voltage zero crossing point position and a reference voltage peak value position of the phase selection closing waveform; and the phase-selection closing phase angle of the AC filter and the converter transformer is identified based on the identified data, so that accurate identification of the phase-selection closing waveform and accurate calculation of the phase-selection closing phase angle are realized, the accuracy and timeliness of evaluation of the phase-selection closing effect of the converter station are improved, the professional requirement on evaluation workers is reduced, and the evaluation efficiency is improved. The evaluation workload is reduced, the efficiency and quality of evaluation work are improved, effective technical support is provided for evaluation of the converter station phase selection switching-on effect, and safe and stable operation of an extra-high voltage direct current transmission system is guaranteed.

This invention discloses a backup protection method and system for handling abnormal information interaction, belonging to the field of power system relay protection technology. Upon receiving an alarm signal from the communication channel, this invention sets corresponding action delays based on whether the alarm signal originates from multiple sources. The measured voltage and current at the protection installation point are processed with the same filter and then phase selection calculation is performed. Based on the phase selection result, the operating voltage and polarization voltage are calculated. If the polarization voltage is higher than a threshold value, the polarities of the operating voltage and polarization voltage are compared. If the polarities are different, it is an intra-zone fault, and the protection operates with a delay. If the polarization voltage is not higher than the threshold value, a system of differential equations is established. The fault distance is obtained by solving the differential equations. If the fault distance is less than the threshold value, it is an intra-zone fault, and the protection operates with a delay. This invention can handle abnormal information interaction between the local substation and adjacent substations, providing backup protection for lines and other outgoing lines between the local substation and adjacent substations, and effectively improving the safety and stability margin of the protection system.

This disclosure provides a data transmission apparatus, a data transmission method, and an electronic device. The data transmission apparatus includes a clock generation module, a phase selection module, and a data transmission module. The clock generation module is configured to sequentially generate N sampling result clock signals with uniformly distributed phases. The phase selection module is configured to determine a target sampling result clock signal based on the phase relationship between the N uniformly distributed sampling result clock signals and a second low-speed clock. The data transmission module is configured to sample source data based on the target sampling result clock signal to generate intermediate transmission data, and then sample the intermediate transmission data based on the second low-speed clock to obtain the target data. This data transmission apparatus enables efficient data transmission across clock domains, simplifies the data transmission path, has lower data transmission latency, significantly reduces chip area and power consumption, and improves data transmission reliability.

The application relates to the field of measuring electric variables, and discloses a high-voltage circuit breaker state monitoring and evaluation method and system. Whether the breaking and closing performance is normal is judged by analyzing the arc time, closing inrush current, closing resistance and phase selection function in the breaking process. Whether the phase selection function is normally operated is judged by analyzing the operation of the phase selection function. Whether the mechanical characteristics are normal is judged by analyzing the mechanical characteristic performance of the circuit breaker. Whether the insulation performance is abnormal is detected by analyzing the change of the insulation performance of the circuit breaker during operation. The electric life of the circuit breaker is more deeply analyzed by comprehensively analyzing the judgment results, and the residual electric life of the circuit breaker is evaluated by setting an electric life threshold, which is favorable for accurately identifying the specific reasons and change of the circuit breaker failure problem, effectively analyzing and evaluating the electric life in a more in-depth manner, and thus making the evaluation result of the electric life more accurate.

This invention discloses a generator current short-arc interruption device and method based on an environmentally friendly generator circuit breaker (GCB), belonging to the field of electrical equipment technology. The device includes an environmentally friendly generator circuit breaker (GCB), a first-phase selection unit, a current zero-crossing prediction module, and a phase-by-phase operation actuator. The first-phase selection unit divides the fault phase angle into intervals and selects phases with moderate asymmetry as the first-phase to avoid a surge in arc energy caused by extreme asymmetry. The current zero-crossing prediction module processes fault current sampling data and accurately identifies the ideal zero-crossing point at the end of the small half-wave. The phase-by-phase operation actuator reserves mechanical operation time to control each phase to trip near the ideal zero-crossing point, completing the short-arc interruption of the fault current. This invention, through phase-by-phase operation, optimized first-phase selection, and ideal current zero-crossing point prediction, can achieve short-arc interruption of fault currents with high asymmetry, control and reduce arc energy, and balance the speed, environmental friendliness, and reliability of fault interruption.

The application provides a de-icing system and a de-icing method. The de-icing system comprises: a rectifier transformer comprising at least two parallel rectifier modules; and a phase selector, one phase selector being connected to each rectifier module, each phase selector comprising: a positive phase selection module configured to connect the positive pole of the rectifier module to a non-de-icing phase line in a three-phase transmission line; and a negative phase selection module configured to commonly connect the negative poles of the rectifier modules to a target de-icing phase line in the three-phase transmission line; wherein the positive poles of different rectifier modules are connected to different non-de-icing phase lines, so that the direct current output by different rectifier modules flows into the target de-icing phase line through different non-de-icing phase lines at the same time, and the target de-icing phase line is de-iced. The application can select any phase as the target de-icing phase line in the line to be de-iced through the phase selector, utilize the line self-reactance to bear the voltage division and current sharing effect, realize line de-icing, and reduce the redundancy and complexity of the power transmission system.