240results about "Phase sequence/synchronism indication" patented technology

The invention discloses an intelligent distribution network nuclear phase method and system based on GPS clock synchronization, and relates to the field of power system distribution network operation and maintenance. The intelligent distribution network nuclear phase method and system based on GPS clock synchronization comprise a nuclear phase source reference unit, a non-contact nuclear phase terminal and a cloud server system. According to the intelligent distribution network nuclear phase method and system based on GPS clock synchronization, three-phase voltage waveforms are continuously collected through a nuclear phase source reference unit, and reference waves are formed through GPS clock synchronization, time label adding and cloud real-time synchronization; a non-contact phase checking terminal is used for collecting three-phase voltage waveforms of a measuring end, GPS clock synchronization, time label adding and data packaging are carried out and uploaded to a cloud end, then a cloud server system is used for intercepting the voltage waveforms of the same time period through a GPS clock to carry out phase checking and phase difference analysis, and then feedback signals are generated according to the analysis result and a phase difference threshold value. The single-person non-contact operation is realized, the safety is high, the precision is high, and the nuclear phase structure can be stored.

The invention relates to the field of phasing instruments, in particular to an airborne wireless phase checking and phasing instrument which comprises an unmanned aerial vehicle, a host and a detector (composed of an X detector and a Y detector), a 4.3-inch 65K-color LCD color screen is selected for the host, the phase, frequency, phase sequence, phase checking results and dynamic vector diagram indication can be displayed on the same screen, and a voice prompt module is arranged in the host. The device can be used inside or outside a transformer substation and is not affected by topographic conditions.

The invention discloses a phase sequence detection method and device for an inverter electric meter, computer equipment and a storage medium, and the method comprises the steps: controlling a first phase of an inverter to operate according to a set power in response to a phase sequence detection request, the first phase comprising at least one of an R phase, an S phase and a T phase, the set power comprises at least one of first set power of the R phase, second set power of the S phase and third set power of the T phase, and the first set power, the second set power and the third set power are different from one another; acquiring electric meter power of a second phase electrically connected with the first phase in the electric meter; the second phase comprises at least one of an R phase, an S phase and a T phase; and determining a phase sequence detection result between the first phase and the second phase according to the set power of the first phase and the electric meter power of the second phase. According to the embodiment of the invention, the three-phase imbalance work of the inverter is controlled to realize automatic detection.

The invention provides a current phase sequence automatic identification method and system, and the method comprises the steps: collecting a three-phase current signal, preprocessing the three-phase current signal, and inputting the preprocessed three-phase current signal to a spatial-temporal feature extraction model; the model extracts the depth time sequence features of each phase through a plurality of parallel one-dimensional convolutional neural networks, and fuses the depth time sequence features by using an attention mechanism to capture the dynamic relevance between the phases and generate a space-time fusion feature vector; inputting the space-time fusion feature vector into a pre-trained generative adversarial network, and calculating a deviation degree between the space-time fusion feature vector and a normal state to obtain an abnormal score; and if the abnormal score exceeds a threshold value, judging that the phase sequence is abnormal, further starting a diagnosis classifier to determine an abnormal type, and finally generating and outputting a phase sequence adjustment control signal corresponding to the type. According to the method, the problems of low recognition accuracy and insufficient intelligence of a traditional method under complex working conditions are solved, and high-robustness monitoring and active closed-loop correction of the phase sequence are realized.

The invention belongs to the technical field of power grids, and relates to a voltage and current phase sequence recognition device based on single-phase voltage sampling and others, the phase sequence recognition device comprises a device power supply unit, a voltage sampling unit, three current detection units and a data processing unit, the device power supply unit is connected in parallel with the voltage sampling unit, and the three current detection units are connected in parallel with the data processing unit. The voltage sampling unit carries out voltage sampling on any phase line in the three-phase four-wire system power grid, the three current detection units carry out current sampling on each phase line of the three-phase four-wire system power grid, and the data processing unit reconstructs voltage signals of the other two phases according to voltage sampling models and current sampling signals. And identifying the phase sequence of the voltage and the current of the three-phase four-wire system power grid. According to the invention, the phase sequence identification of the three-phase line voltage and the three-phase current can be carried out only by sampling the single-phase voltage signal and the three-phase current signal, and the method has the characteristics of fast phase sequence identification speed and high efficiency, and also has the characteristics of simple installation, convenient use and plug-and-play.

The invention discloses a method and device for monitoring a burning loss hidden danger of metering equipment, and relates to the technical field of power systems. The method comprises the following steps: confirming a monitored electric energy meter corresponding to monitored metering equipment; acquiring data of a monitored electric energy meter to obtain monitored meter data, the monitored meter data including monitored meter voltage data and monitored meter current data; identifying the phase sequence of the voltage data of the monitored meter and / or the current data of the monitored meter to obtain a phase sequence identification result; according to the phase sequence identification result, extracting data corresponding to a target phase sequence from the monitored table data to obtain first phase sequence data; and according to the first phase sequence data, judging whether the metering equipment has a burning loss hidden danger or not. According to the method, the burning loss hidden danger of the metering equipment can be accurately identified, and the occurrence position of the burning loss hidden danger can be positioned.

The invention discloses an ultra-high voltage nuclear phase correction method, device and equipment based on multi-source data fusion and a medium, and relates to the technical field of power grids, and the method comprises the steps: firstly obtaining the t-th round of multi-source data and a real phase value of ultra-high voltage equipment; and inputting the multi-source data into the pre-trained neural network model to generate a correction coefficient, correcting a phase value by combining the correction coefficient and the original phase value, and calculating a phase error with a real phase value. If the phase error exceeds the error threshold value and the adjustment frequency does not exceed the adjustment frequency threshold value, adjusting the gain of the acquisition equipment amplifier according to the electric field intensity, and re-acquiring the (t + 1) th round of multi-source data; and outputting a corrected phase value if the phase error reaches the standard. In addition, the correction phase value needs to be rechecked by two persons, and when the deviation exceeds a second threshold value, intelligent contract alarm and frozen combination ring operation are triggered; time deviation and a second phase error can be obtained through the current temperature, and secondary correction is carried out on the original phase value. According to the method, the nuclear phase precision and safety of the ultrahigh-voltage equipment can be improved.

The invention relates to an ammeter phase sequence adjusting method, a computer readable storage medium, a sampling device and a grid-connected power generation system, after an inverter is connected to a grid, if it is determined that reactive current output by the inverter reaches preset reactive current, reactive current increment of the inverter is calculated, and three-phase instantaneous current of a three-phase power grid is obtained; determining a current sampling phase sequence of the electric meter based on the reactive current increment, obtaining a three-phase voltage of the inverter and performing clark conversion to obtain a first voltage component and a second voltage component, determining a voltage sampling phase sequence of the electric meter according to the first voltage component, the second voltage component and the three-phase instantaneous current, and if the current sampling phase sequence or the voltage sampling phase sequence is incorrect, determining that the three-phase instantaneous current is correct. And exchanging the corresponding relationship between the sampling data corresponding to the incorrect current sampling phase sequence or the incorrect voltage sampling phase sequence and the preset assignment data, so that the current sampling phase sequence and the voltage sampling phase sequence are matched with the phase sequence of the signal output to the three-phase power grid by the inverter. The ammeter calculation correctness is improved, and the phase sequence adjustment efficiency is improved.

The application provides a power module test method, system, device and medium. The method is applied to a chip test device, the chip test device includes a probe card, the probe card includes a plurality of phase sequence modules, and each phase sequence module is connected with a drive board. For the plurality of phase sequence modules, when it is detected that a target drive board is powered on, the target drive board reads test configuration information from the phase sequence module, the target drive board generates a first target phase sequence drive voltage based on initial phase sequence voltage information in the test configuration information, when a drive instruction is received, the target drive board generates a drive signal, and based on the drive signal, the first target phase sequence drive voltage is transmitted to the power module under test through the phase sequence module at a target pin to drive the power module under test. Therefore, no matter how the drive board is placed, the phase sequence drive voltage generated by the drive board can be accurately matched to the corresponding phase sequence of the device through the power module under test, manual operation errors are reduced, and test safety is ensured.

The invention belongs to the technical field of phase checking instruments, and particularly relates to a phase checking instrument with a phase checking function for a 10-kilovolt ring main unit switch. Comprising a mobile acquisition device and a handheld nuclear phase host, the mobile acquisition device comprises a mobile chassis, the mobile chassis is provided with a main supporting vertical plate, the main supporting vertical plate is provided with a lifting driving assembly, the lifting driving assembly is connected with a lifting mobile side plate, and the lifting mobile side plate is provided with a telescopic driving assembly. The telescopic driving assembly is connected with a telescopic moving side plate, the telescopic moving side plate is provided with a spacing adjusting assembly, the spacing adjusting assembly is connected with two mounting sleeves, the mounting sleeves are internally connected with acquisition emitters, and the acquisition emitters are used for performing signal acquisition on the ring main unit through acquisition points on the ring main unit; the collected information is wirelessly sent to the handheld nuclear phase host; the ring main unit phase checking device can effectively assist workers in phase checking operation of the ring main unit, labor is saved, operation efficiency is improved, and high efficiency of phase checking operation and accuracy of results are guaranteed.

The embodiment of the invention provides a low-voltage transformer area user phase determination method and device, equipment and a medium. The method comprises the following steps: firstly, acquiring a first power supply radius of a power user in a target low-voltage transformer area and first three-phase voltage data of the power user in a first preset duration; determining a second power supply radius of the at least one three-phase user and third three-phase voltage data corresponding to the at least one single-phase user, and then determining a user proportion value corresponding to a target three-phase user of which the second power supply radius of the at least one three-phase user is greater than a first preset threshold value; and finally, determining the phase of the at least one single-phase user according to the third three-phase voltage data corresponding to the at least one single-phase user, the user proportion value and a second preset threshold. According to the method provided by the invention, the determination of the user phase of the low-voltage transformer area is realized, and the identification efficiency and the identification accuracy of the user phase are improved.

The utility model is suitable for the technical field of phase checking instruments, and provides a portable intelligent phase checking instrument, which comprises an insulating rod and a signal transmitter matched with the phase checking instrument, one end of the signal transmitter is provided with a socket matched with the insulating rod in a threaded manner, and the other end of the signal transmitter is provided with a clamping unit. The clamping unit comprises two pincer handles which are arranged in a crossed mode, two pincer heads installed at the ends of the pincer handles and a driving unit for driving the two pincer handles to rotate in a crossed mode, the two pincer handles are rotationally installed in the signal transmitter through an installation shaft, arc-shaped grooves are symmetrically formed in the two pincer heads, and contact ends are arranged in the arc-shaped grooves. When the driving unit in the clamping unit drives the two clamp handles to rotate crosswise, the driving unit can drive the two clamp heads to clamp the line to be subjected to phase checking and enable the contact end to be in stable contact with the line, so that compared with contact with an electric power line in a contact hook mode in the prior art, the influence of strong wind weather on the detection of the phase checking instrument does not need to be worried, and the detection efficiency is improved. And the use and the operation of the nuclear phase instrument are convenient.

A system for discovering the topology and phases of a power distribution system is provided. For example, a group of meters connected to the power distribution system can process sensor data acquired at the meters and generate descriptors based on the processed data, sending the descriptors to a headend system. The headend system can, after receiving descriptors from the individual meters in the system, group the meters to generate groups by applying a clustering algorithm to the descriptors of these meters. The headend system can also compare the current group with past groups to determine the confidence level of the current group, and assign segment identifiers or phase identifiers, or both, to one or more meters based on the confidence level.

The present invention belongs to the technical field of smart substations, and specifically relates to a method and system for smart phase checking in substations. The method constructs a dynamic priority evaluation model, integrates multi-source data of four basic factors: voltage phase difference, ambient temperature and humidity, equipment vibration, and historical error, and uses a fuzzy comprehensive evaluation method to calculate weights and dynamically sort them. A multi-port phase scattering model is constructed based on the substation topology, and impedance mismatch points are analyzed with the help of a Smith chart to implement two-stage optimization. A three-layer decision input set is constructed based on the optimization model, and a fuzzy logic-driven adaptive rule engine is designed to dynamically output the operating condition level and match the phase checking strategy. Multi-dimensional quality assessment is performed through real-time monitoring of indicators such as reflection coefficient, dynamically updating factor weights, optimizing fuzzy model parameters, and integrating LSTM and graph neural networks to realize abnormal pattern recognition and compensation strategy solidification, forming a self-evolving closed-loop system, and ultimately achieving a transition from precise matching to autonomous evolution in the phase checking process.

The utility model provides a non-contact current nuclear phase device, which relates to the technical field of electric power detection and comprises a three-phase cable, a coil array, a signal receiving and processing device and an upper computer. The coil array, the signal receiving and processing device and the upper computer are electrically connected in sequence, and the coil array is arranged between the signal receiving and processing device and the three-phase cable. According to the utility model, the coil array is arranged between the signal receiving and processing device and the three-phase cable, so that the sensor is prevented from being too close to the cable, the measurement condition is looser, and the installation safety of the measurement device is better guaranteed; each coil group in the coil array is provided with two magnetic core-containing coils of which the sensitive directions are perpendicular to each other, interference signals can be better eliminated, each magnetic core-containing coil contains a manganese-zinc magnetic core, the sensitivity of the coils is enhanced, smaller current can be measured, longer-distance measurement can be realized, and the installation of the measuring device is more convenient.

To provide a phase detector jig for electrically connecting a phase detector to a measurement target when measuring phase rotation of the measurement target using the phase detector, which can be easily adapted to measurement targets of various forms and enables safe and quick measurement.SOLUTION: A phase detector jig comprises a plurality of types of measurement target contact heads 1 composed of a plug-in type head to be inserted into a plurality of types of outlets and a contact-type head that can be brought into contact with terminals and conductor parts, and an adapter 2 that can be connected to a phase detector 50, where one of the plurality of types of measurement target contact heads 1 can be freely connected to and disconnected from the adapter 2.SELECTED DRAWING: Figure 1

The utility model discloses a three-phase voltage, frequency and phase sequence detection circuit, and belongs to the technical field of electric power detection. The three-phase voltage, frequency and phase sequence detection circuit comprises an MCU control unit, an A-phase detection circuit, a B-phase detection circuit and a C-phase detection circuit, wherein the A-phase detection circuit, the B-phase detection circuit and the C-phase detection circuit have the same structure. Each detection circuit comprises a voltage sampling circuit and a frequency detection circuit. According to the utility model, the operational amplifier is used for scaling down the input voltage, and the input voltage is skillfully raised to a range which can be accurately sampled by the MCU, compared with a traditional transformer detection method, the size and the weight are greatly reduced, the waveform distortion is extremely small, the characteristics of an original voltage signal are accurately reflected, and the detection precision is greatly improved. The effects of small size, light weight, low cost and high detection precision can be simultaneously achieved.

Method and system for phase detecting of hybrid wye-connected and delta-connected loads in an unbalanced power distribution system. A data-driven event-triggered phase identification algorithm is presented in which the exceeding current fluctuation events are used to build the relationship between the feeder head and the undetermined phase load and mutual information index is used to assess the dependence level of the feeder head on the undetermined phase load. The connected and non-connected phase of wye-connected and delta-connected single-phase load are determined as the phase having highest and lowest dependences of the phases of feeder head on the load, respectively.

Systems and methods, as described herein, relate to a circuit tracer transmitter including an integrated continuity test. In addition, systems and methods, as described herein, relate to communicating data over a conductor that is being tested with a circuit tracer, load continuity tester, and / or an integrated circuit tracer with load continuity tester. In addition, systems and methods, as described herein, relate an integrated receptacle tester in circuit tracing hardware through circuitry and / or logic.

This invention provides a detection device, comprising: a main body; a power receiving terminal; a stop component movably disposed on the main body, wherein when the stop component is in the stop position, it can abut against the power receiving terminal to maintain a conductive state between the power receiving terminal and the detection terminal; when the stop component is in the disengaged position, it separates from the power receiving terminal to separate the power receiving terminal from the detection terminal; and a positioning component movably disposed on the main body or on the stop component, wherein when the positioning component is in the positioning position, it is positioned against the stop component to maintain the stop component's position; and when the positioning component is in the unlocked position, it disengages from the stop component to allow the stop component to move. The technical solution of this application effectively solves the problem of unstable connection between detection devices and electrical equipment in related technologies.

The invention relates to a multifunctional non-contact nuclear phase system, and belongs to the technical field of phase identification of power systems. The system comprises a metal hook power taking module, an amplifying circuit, a comparator, a microcontroller MCU, a Beidou time service module, a liquid crystal display module and a power supply module. The system is suitable for phase checking of closed equipment such as a switch cabinet, a ring main unit, a box transformer substation and a cable branch box, power failure is not needed, and an insulating baffle of a handcart does not need to be opened. The method only depends on zero crossing point detection, does not need standard phase reference, has the characteristics of high precision, strong interference resistance, remote visual operation and the like, and effectively avoids risks of electric shock of personnel, interphase short circuit and equipment damage.

The application discloses a phase checking device, system and method for a power distribution network, and relates to the technical field of phase sequence synchronization indication. The phase checking device comprises a phase checking module, which is used for obtaining the phase sequence of a pre-repair alternating current voltage signal, obtaining the phase sequence of an analog alternating current voltage signal, comparing the phase sequence of the pre-repair alternating current voltage signal with the phase sequence of the analog alternating current voltage signal, and obtaining a phase checking result. The phase checking system comprises the phase checking device and a phase sequence generating device. The phase sequence generating device comprises a phase sequence generating module, which is used for obtaining the phase sequence of the pre-repair alternating current voltage signal and generating the analog alternating current voltage signal with the same phase sequence. The phase checking method comprises a phase checking step, a comparison of the phase sequence of the pre-repair alternating current voltage signal with the phase sequence of the analog alternating current voltage signal, and obtaining of the phase checking result. The phase checking device, system and method improve the efficiency of the phase checking work by comparing the phase sequence of the pre-repair alternating current voltage signal with the phase sequence of the analog alternating current voltage signal.

The invention relates to a line phase checking method, device and equipment, a storage medium and a program product. The method comprises the following steps: modulating an initial carrier signal by adopting a signal modulation parameter to obtain a target carrier signal; injecting the target carrier signal into the target line; acquiring signal data in the target line from the phase to-be-measured point of the target line, and filtering the signal data to obtain a filtered signal corresponding to the target carrier signal; extracting the actual phase of the filtering signal; and determining a nuclear phase result of the target line according to the phase difference between the actual phase and the reference phase. According to the method, phase checking is carried out on the target line by using the characteristic that the carrier signal can stably transmit the phase characteristic in the line, the stability and accuracy of the phase checking result can be improved, and the phase checking efficiency is improved.

The invention provides an intelligent power grid nuclear phase system based on a cloud platform. Relates to the technical field of power system measurement, in particular to the technical field of power system operation and maintenance and power grid nuclear phase. According to the specific implementation scheme, the system comprises a first data collector, at least one second data collector and a server, wherein the first data collector collects reference phase angle information and first Beidou second time information of a reference power grid; the second data acquisition unit acquires measurement phase angle information and second Beidou second time information of the to-be-measured power grid; and the server receives and processes the reference phase angle information of the reference power grid, the measurement phase angle information of the to-be-measured power grid, the first Beidou second time information and the second Beidou second time information, and verifies the initial phase angle of the to-be-measured power grid.

The invention discloses a three-phase electric meter access detection method, device and system and a storage medium, and relates to the technical field of equipment detection.The electric meter is connected to the alternating current side of power conversion equipment, each phase of the electric meter is connected to a current transformer, and based on the split-phase control function of the power conversion equipment, after the power of the power conversion equipment is limited, the three-phase electric meter access detection is completed. According to the three-phase current difference value of the alternating current side of the power conversion equipment before and after power limitation collected by the ammeter, the access position and direction of each phase current transformer of the ammeter are determined, and accurate detection of misconnection of each phase current transformer of the ammeter is realized.

The invention discloses a cable nuclear phase system. The system comprises a first device and a second device. The first device determines whether the head end of the target cable is in phase matching with the superior equipment based on the first image; wherein the head end and the tail end of the target cable are marked with phase identifiers; the upper-level equipment and the lower-level equipment are marked with phase marks; the second device determines whether the tail end of the target cable is in phase matching with the subordinate equipment based on the second image, generates a matching result and sends the matching result to the first device; the first device is used for generating and transmitting phase information to the second device after determining that the head end of the target cable is matched with the phase of the superior equipment and receiving a matching result indicating that the tail end of the target cable is matched with the phase of the subordinate equipment; and the second device is used for evaluating whether the superior equipment and the subordinate equipment are phase-matched based on the phase information. It can be seen that phase matching of a complete link is ensured to be correct comprehensively through phase checking of the head end and the tail end of the target cable and phase checking of the upper-level equipment and the lower-level equipment.

This invention relates to the field of safety protection technology for low-voltage power distribution systems, and discloses a neutral-line fault detection circuit, a neutral-line fault detection method, and a switching device. The neutral-line fault detection circuit provided by this invention adopts a collaborative architecture of hardware detection and software judgment. The hardware side uses a voltage monitoring module to detect the DC voltage between the target phase line and the N-phase, and combines this with an isolation conversion module to achieve level conversion and isolation, outputting a neutral-line fault trip signal. The software side uses a control module to sample the three-phase voltage values ​​and voltage phase angles in real time, and judges the line status based on the level state of the neutral-line fault trip signal, combined with the target phase voltage and phase angle. When it is determined that the N-phase is neutral-line faulted, the control module outputs a signal to control the trip circuit to operate, achieving protection. This invention can accurately trip the neutral line without detecting three-phase balance, uses fewer components, has low cost, and occupies less circuit board space. It can be widely used in reclosing circuit breakers, molded case circuit breakers, and other switching devices, significantly improving reliability and stability.

The invention relates to the technical field of electric power engineering, and provides a power grid phase sequence identification method and device, electronic equipment and a storage medium. The power grid phase sequence identification method comprises the steps that input voltage of a target power grid is sampled according to a preset sampling period, three-phase sampling voltage is obtained, and the three-phase sampling voltage comprises sampling voltage corresponding to each phase; and determining the phase sequence of the target power grid according to the magnitude relationship of the sampling voltages of any two phases in the three-phase sampling voltages and the change trend of the sampling voltage of the remaining phase. According to the method, the magnitude relation of any two phases of sampling voltages in the three phases of sampling voltages and the change trend of the sampling voltage of the remaining phase are analyzed, so that the phase sequences of different power grids can be automatically and effectively identified, the application range of the frequency of the charging pile is expanded, and the power grid adaptability of a machine is improved.

The invention relates to a method for assigning current values ​​(i) to corresponding voltage values ​​(u) in a multi-phase load circuit (L), in which electrical energy is transmitted from a voltage source (100) to a motor (M) and a reversing contactor circuit (WS, Q1, Q2) connected in the load circuit (L) enables a change in the direction of rotation (RotR, RotL) of the motor (M) by means of two different phase conductor arrangements (LR, LL), comprising the following steps: - Recording of current values ​​(i) in phase conductors (L1, L2, L3) of the load circuit (L), seen in the direction of electrical energy transmission, behind the reversing contactor circuit (WS, Q1, Q2), - detecting voltage values ​​(u) in the load circuit (L) by tapping at least one voltage in the load circuit (L), seen in the direction of electrical energy transmission, upstream of the reversing contactor circuit (WS, Q1, Q2), - providing information about a phase conductor arrangement (LR, LL) present at the time of recording the current values ​​(i) and voltage values ​​(u); - Assigning detected current values ​​(i) to corresponding detected voltage values ​​(u) based on the information provided.

A three-class AC power supply voltage value and phase sequence detection system comprises an MCU, and an AC220V / 50Hz conditioning circuit, an AC115V / 400Hz conditioning circuit, an AC380V / 50Hz conditioning circuit and a protection alarm which are electrically connected with the MCU, the AC220V / 50Hz conditioning circuit comprises a Hall voltage sensor, the input end of the Hall voltage sensor is connected with a conditioning resistor R in series and then is connected with a power supply, the output end of the Hall voltage sensor is connected with a capacitor C55 in series and then is connected with an input port of the MCU, and the protection alarm is electrically connected with the MCU. The output end of the MCU is further connected in series with a divider resistor R55 and then grounded, and the input port of the MCU is connected in series with a resistor R75 and then connected with + 3.3 V and is connected in series with a resistor R74 and then grounded; the AC115V / 400Hz conditioning circuit comprises an instrument amplifier and a voltage feedback amplifier, the input end of the instrument amplifier is connected with a power supply after being connected with a resistance voltage division circuit in series, and the output end of the instrument amplifier is connected with a positive input end of the voltage feedback amplifier after being sequentially connected with a capacitor C13 and a voltage lifting circuit in series; the output end of the voltage feedback amplifier is connected with the input port of the MCU and the negative input end of the voltage feedback amplifier. According to the scheme, voltage values of AC220V / 50Hz, AC115V / 400Hz and AC380V / 50Hz can be acquired in real time, the phase sequences of AC115V / 400Hz and AC380V / 50Hz can be measured, and timely protection and alarm can be realized.