Intelligent three-phase AC power transducer

Abstract

The application discloses a kind of intelligent three-phase ac power transmitter, comprising: electric quantity measurement chip, for collecting three-phase voltage, current signal and calculating relevant electric parameter;Relay, between three-phase voltage sampling channel and the voltage measurement port of electric quantity measurement chip, for switching the connection relationship of voltage sampling channel and the voltage measurement port of electric quantity measurement chip;Single-chip microcomputer, respectively connect measurement chip and relay, according to the electric parameter of reading voltage phase sequence, current phase sequence or current direction is wrong or not;When voltage phase sequence is wrong, single-chip microcomputer controls relay to switch sampling channel to correct;When current phase sequence or direction is wrong, by software rearrangement current channel logic or transform current phase angle, output after correction electric parameter.Compared with prior art, by voltage hardware switching and current software reorganization, in the case where equipment is not powered and without changing external wiring, three-phase voltage phase sequence, current phase sequence and direction error are safely and conveniently automatically corrected.

Description

Technical Field

[0001] This invention relates to the field of power monitoring technology, and in particular to an intelligent three-phase AC power transmitter. Background Technology

[0002] Three-phase power transmitters are widely used in industrial automation to monitor electrical parameters such as active and reactive power in equipment like three-phase motors and heaters. Due to differences in rated voltage and current among different devices, voltage and current transformers are often required in practice, resulting in a large number of wiring connections in the field. If operators make wiring errors due to negligence, it can lead to incorrect phase sequence or incorrect input direction, causing abnormal transmitter output signals and, in severe cases, even affecting system regulation. Typically, such problems only become apparent after the equipment is started, and at this point, they cannot be corrected by changing the wiring. Live operation poses safety risks, and disconnecting the transmitter's current measuring line could cause equipment malfunction or damage to the current transformer. Therefore, the only recourse is to wait until the equipment is stopped and powered off, severely impacting normal equipment commissioning and operation.

[0003] A search revealed that application publication number CN111983521A discloses an energy meter and method with automatic identification and correct metering functions for incorrect wiring. This scheme constructs a vector diagram by collecting three-phase voltage and current data, compares it with a preset incorrect wiring database to identify the type of wiring error, and performs supplementary calculation of correct electricity consumption through internal metering correction. However, the identification and correction process of this scheme requires matching with the preset incorrect wiring database, and its identification range is limited by the completeness of the database; its error correction method is limited to the reorganization of metering data at the software level, and the external wiring error itself is not corrected at the physical level; at the same time, this scheme does not involve the physical switching of voltage and current sampling channels, and it is difficult to directly adapt to the application scenarios of transmitters that need to output correct analog electrical parameter signals in real time.

[0004] Therefore, how to safely and conveniently correct voltage, current phase sequence, and direction errors caused by wiring mistakes in a three-phase AC power transmitter without interrupting power or altering external wiring is a technical problem that needs to be solved. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an intelligent three-phase AC power transmitter.

[0006] The objective of this invention can be achieved through the following technical solutions: According to a first aspect of the present invention, an intelligent three-phase AC power transmitter is provided, comprising: The power metering chip is used to collect three-phase voltage and three-phase current signals and calculate relevant electrical parameters. A relay is connected between the three-phase voltage sampling channel and the voltage measurement port of the power metering chip, and is used to switch the connection relationship between the voltage sampling channel and the voltage measurement port of the power metering chip. A microcontroller is connected to the power metering chip and the relay respectively. The microcontroller determines whether there is a voltage phase sequence error, current phase sequence error or current direction error based on the electrical parameters read by the power metering chip. When a voltage phase sequence error exists, the connection relationship of the voltage sampling channel is corrected by controlling the relay to switch. When there is an error in the current phase sequence or the current direction, the logical correspondence of the current sampling channels is rearranged through software algorithms, or the current phase angle is mathematically transformed to obtain the corrected relevant electrical parameters.

[0007] As a preferred technical solution, the microcontroller determines whether there is a voltage sampling channel misconnection by comparing the consistency of the three-phase voltage amplitudes, and when the three-phase voltage amplitudes are inconsistent within a preset error range, it controls the relay to swap the two ends of the voltage sampling channel corresponding to the lowest amplitude, and re-determines whether the three-phase voltage amplitudes are consistent.

[0008] As a preferred technical solution, the microcontroller determines whether the voltage phase sequence is correct by checking whether the phase angle difference between two adjacent phase voltages is within the allowable error range of 120°. When the phase angle difference between two adjacent phase voltages does not meet the allowable error range of 120°, the microcontroller controls the relay to swap the sampling channels of two phase voltages and re-determines whether the phase angle difference between two adjacent phase voltages meets the requirements.

[0009] As a preferred technical solution, the microcontroller checks whether the phase angle difference between two adjacent phase currents is within the allowable error range of 120°. If so, it determines that the current phase sequence and direction are correct; if not, it further determines whether the phase angle difference between two adjacent phase currents is within the allowable error range of ±120° or ±240°, in order to identify the error type of incorrect phase sequence or reversed current direction.

[0010] As a preferred technical solution, if the phase angle difference between two adjacent phase currents is not within the allowable error range of ±120° or ±240°, the microcontroller sequentially adds 180° and subtracts 180° from the phase angle of each phase current in phases A, B, and C, respectively, while keeping the phase angles of the other two phase currents unchanged, and re-determines whether the phase angle difference between two adjacent phase currents conforms to the preset allowable error range of ±120° or ±240°.

[0011] As a preferred technical solution, when the phase angle difference between two adjacent phase currents is within the allowable error range of ±120° or ±240°, the microcontroller calculates the adjacent phase angle difference according to six permutation combinations of the phase angles corresponding to the three phase currents A, B, and C, selects the permutation combinations in which the adjacent phase angle differences all meet the allowable error range of 120°, and re-establishes the correspondence between the three phase currents and the physical channels according to the permutation combinations.

[0012] As a preferred technical solution, the intelligent three-phase AC power transmitter further includes a DIP switch connected to the microcontroller, the DIP switch comprising: The first DIP switch is used to trigger the microcontroller to perform operations to check and correct errors in the three-phase voltage phase sequence, current phase sequence, and current direction. The second DIP switch is used to set the positive and negative states of the active power of the device under test; The third DIP switch is used to set the positive and negative states of the reactive power of the device under test. When the microcontroller performs the correction operation, it verifies whether the phase angle difference between the three-phase voltage and the three-phase current matches the relationship between the positive and negative states of active power and reactive power set by the second and third DIP switch positions. If they do not match, increase or decrease the phase angles of all three-phase currents by 180° and check again; if they match, save the adjusted current phase angle configuration.

[0013] As a preferred technical solution, the microcontroller saves the corrected voltage sampling channel configuration, current phase sequence correspondence and current direction as the default configuration, and performs remapping calculation on the original electrical parameters read from the power metering chip according to the default configuration, and outputs the corrected relevant electrical parameters.

[0014] As a preferred technical solution, the microcontroller also receives manual configuration commands through a host computer communication interface or a local human-machine interface, and directly modifies the correspondence of voltage sampling channels, the correspondence of current phase sequence, or the direction of current according to the manual configuration commands, and saves them as default configurations.

[0015] As a preferred technical solution, the microcontroller initiates a self-test and correction operation after receiving an external trigger signal, wherein the external trigger signal comes from a DIP switch, a host computer instruction, or a local button.

[0016] Compared with the prior art, the present invention has the following advantages: 1. This invention adopts an architecture of hardware voltage switching and software current reconfiguration. It uses relays to switch voltage sampling channels and microcontroller software to rearrange the current phase sequence and adjust the current direction. This enables automatic correction of voltage phase sequence errors, current phase sequence errors, and current direction errors without interrupting power or altering external wiring, thus avoiding power outage losses and eliminating the safety risks of live-line work.

[0017] 2. This invention provides a complete automatic correction process that can automatically identify various wiring problems such as inconsistent voltage amplitude, incorrect voltage phase sequence, incorrect current phase sequence, and incorrect current direction. It then sequentially performs steps such as voltage amplitude correction, voltage phase angle correction, current phase angle layer judgment, single-phase current direction attempt, permutation and combination matching, and power matching verification. This achieves full-process processing from error identification to automatic correction, improving the automation level and accuracy of correction.

[0018] 3. The relay of this invention only switches the voltage sampling channel, and the current sampling channel does not have a relay, which reduces hardware cost and PCB layout difficulty, reduces the probability of equipment failure caused by relay failure, and achieves high reliability and low cost while ensuring complete functionality.

[0019] 4. This invention utilizes the characteristic of the power metering chip to calculate the phase angle using the A-phase voltage as the fundamental wave. By switching the voltage sampling channel through a relay, the stability of the A-phase reference is maintained, thereby obtaining an accurate and easily processed phase angle value. This provides a reliable phase angle basis for software to judge the three-phase current phase sequence error and the incoming line direction error, ensuring the correction accuracy.

[0020] 5. This invention realizes the interactive logic of manual setting and automatic execution through DIP switches. Operators can preset the positive and negative states of active power and reactive power according to the load characteristics of the monitored equipment. The microcontroller verifies the correction results based on the settings, which improves the reliability of automatic correction.

[0021] 6. This invention supports manual configuration via a host computer communication interface or a local human-machine interface, and allows for flexible adjustment of the error allowable range of various judgment parameters, thus adapting to the application needs of various complex working conditions and special scenarios. Attached Figure Description

[0022] Figure 1 This is the hardware circuit diagram of the intelligent three-phase AC power transmitter of the present invention; Figure 2 This is a flowchart of the automatic calibration process for the intelligent three-phase AC power transmitter of the present invention. Figure 1 The labels indicate: 1. Default component; 2. Sampling resistor; 3. Relay; 4. Power metering chip. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0024] Example 1: like Figure 1 As shown, the intelligent three-phase AC power transmitter of the present invention includes the following core components: The power metering chip is used to acquire three-phase voltage and three-phase current signals and to measure and calculate relevant electrical parameters. The chip integrates multiple sampling channels, corresponding to the voltage and current of phases A, B, and C respectively. The chip stores the measured and calculated values ​​of electrical parameters such as three-phase voltage, current, active power, reactive power, and phase angle in internal registers for the microcontroller to read.

[0025] Sampling resistor: Used to convert high-voltage, high-current signals into signals that the power metering chip can process. Three-phase voltage sampling signals, after passing through the sampling resistor, are connected to the voltage measurement port of the power metering chip via a relay; three-phase current sampling signals, after passing through the sampling resistor, are directly connected to the current measurement port of the power metering chip, without passing through a relay.

[0026] A relay, connected between the three-phase voltage sampling channel and the voltage measurement port of the power metering chip, is used to switch the connection between the voltage sampling channel and the voltage measurement port of the power metering chip. Specifically, the relay is placed between the voltage sampling resistor and the metering chip. The microcontroller controls the on / off state of the relay to change the channel correspondence of the voltage signal entering the metering chip, thereby realizing a virtual line-switching operation. In this invention, the relay is only used to switch the voltage sampling channel; no relay is used for the current sampling channel. Current phase sequence errors and current direction errors are corrected by the microcontroller through software. This hardware architecture reduces hardware costs, decreases the probability of equipment failure due to relay failure, and avoids the potential impact on the measurement reference of the metering chip caused by switching the current channel.

[0027] The microcontroller is connected to both the power metering chip and the relay. The microcontroller reads electrical parameter data from the power metering chip's registers via communication interfaces such as SPI, determines whether there are wiring errors based on a preset automatic correction algorithm, and corrects the wiring by controlling the relay or executing a software algorithm without interrupting power, ultimately outputting the corrected electrical parameters.

[0028] The DIP switch connects to the microcontroller. The DIP switch has three positions: the first position triggers the microcontroller to execute the automatic calibration program; the second position sets the active power of the monitored device to positive or negative; and the third position sets the reactive power of the monitored device to positive or negative. Operators can preset the DIP switches according to the actual load characteristics of the monitored device, and the microcontroller will perform verification and judgment based on these settings during automatic calibration.

[0029] like Figure 2 As shown, the automatic calibration process of the intelligent three-phase AC power transmitter of the present invention is as follows: After completing the external wiring, the operator determines whether the active power and reactive power should be positive or negative when the equipment is working normally, based on the load characteristics of the monitored equipment. Based on this, the operator then toggles the corresponding DIP switches, specifically the second and third DIP positions. Then, toggling the first DIP position triggers the microcontroller to enter the automatic calibration program.

[0030] After the microcontroller starts up, it first reads the basic electrical parameters such as the three-phase voltage amplitude, three-phase voltage phase angle, and three-phase current phase angle collected by the power metering chip, which serve as the basis for subsequent judgments.

[0031] Voltage amplitude correction: The microcontroller reads the phase voltage values ​​of phases A, B, and C, and determines whether the three-phase voltage values ​​are consistent within a preset error tolerance range. This error tolerance range can be preset by on-site personnel via host computer software or a local human-machine interface.

[0032] Judgment Logic: If the three-phase voltage amplitudes are all consistent within the allowable error range, it indicates that the connection relationship of the voltage sampling channels is correct, and the process proceeds to the next step, voltage phase angle correction. If they are inconsistent, the phase corresponding to the lowest phase voltage value is identified. In this case, it is determined that the two ends of the voltage sampling channel for that phase are reversed or incorrectly connected. The microcontroller controls the relay to swap the two ends of the voltage sampling channel for that phase, rereads the three-phase voltage amplitudes, and checks for consistency again. If they are consistent, the process proceeds to the next step; if they are still inconsistent, the user is notified that the voltage amplitude correction has failed, and the program exits.

[0033] Voltage phase angle correction: The microcontroller reads the phase angles of the three-phase voltages A, B, and C, and checks whether the phase angle differences between adjacent phases (phase A and phase B, phase B and phase C, phase C and phase A) are all within the allowable error range of 120°.

[0034] Judgment logic: If the phase angle difference between any two adjacent phase voltages meets the requirements, the voltage phase sequence is correct, and the process proceeds to the next step, current phase angle correction. If it does not meet the requirements, the voltage phase sequence is determined to be incorrect. The microcontroller controls the relay to swap the voltage sampling channels of phase B and phase C, then rereads the three-phase voltage phase angles, checks the adjacent phase angle differences, and again determines whether the adjacent phase angle differences meet the requirements. If they do, the process proceeds to the next step; if they still do not meet the requirements, the user is notified that the voltage phase angle correction has failed, and the program exits.

[0035] Current phase angle correction: The microcontroller reads the phase angles of the three-phase currents A, B, and C, and checks whether the phase angle difference between adjacent phase currents is 120° (within the allowable error range). If the current phase sequence and direction are correct, the system proceeds directly to the next step of power matching verification. If not, the system proceeds to the second level of judgment, where the microcontroller further checks whether the phase angle difference between two adjacent phase currents is ±120° (within the allowable error range) or ±240° (within the allowable error range). If the phase sequence is correct, the system determines that the three-phase current phase sequence is incorrect and proceeds to the permutation and combination matching step. If the phase sequence is incorrect, the system attempts to determine the direction of the single-phase current. If the phase angle difference between two adjacent phase currents is neither 120° (within the allowable error range) nor ±120° (within the allowable error range) or ±240° (within the allowable error range), the system determines that there may be a single-phase current direction reversal. The microcontroller then attempts to increase or decrease the phase angle of each of the three phases A, B, and C by 180° and 180° respectively, while keeping the phase angles of the other two phases unchanged. After each attempt, the system re-checks whether the phase angle difference between the two adjacent phase currents after adjustment is 120° (within the allowable error range). If the requirement is met after a certain attempt, it indicates that the current direction of that phase is reversed. The microcontroller records the correction method for that phase current (increase or decrease by 180°) and proceeds to the next step. If the requirement is still not met after trying all three phases, the user is notified that the current direction correction has failed, and the program exits.

[0036] The specific permutation and combination matching step involves determining whether the phase angle difference between two adjacent phase currents is ±120° (within the allowable error range) or ±240° (within the allowable error range). This indicates that the directions of the three-phase currents are consistent, but the phase sequence may be disordered. In this case, the microcontroller calculates the adjacent phase angle differences for the phase angles corresponding to the A, B, and C phase currents according to six permutation and combination methods, selects the permutation and combination where the adjacent phase angle differences all satisfy 120° (within the allowable error range), and re-establishes the correspondence between the three-phase currents and the physical channels according to this permutation and combination.

[0037] Power matching verification: After completing the phase sequence and direction correction of voltage and current, the microcontroller verifies whether the phase angle difference between the current three-phase voltage and three-phase current meets the expectations based on the positive and negative states of active and reactive power set by the DIP switch.

[0038] Judgment Logic: If the current phase angle difference matches the phase relationship corresponding to the positive and negative power values ​​set by the DIP switch, proceed directly to the next step of configuration saving. If it does not match, increase or decrease the phase angle of all three-phase currents by 180°, i.e., reverse the overall direction of the three-phase current, and then judge again whether the adjusted phase angle difference meets the requirements. If it does match, record the overall reversal operation; if it still does not match, notify the user that the power matching verification failed and exit the program.

[0039] Configuration saving and data output: The microcontroller saves the automatically calibrated voltage sampling channel configuration, current phase sequence correspondence, and current direction as the default configuration, storing them in its internal memory or external storage module. During subsequent normal measurements, the microcontroller reads the raw electrical parameter data from the power metering chip and then performs remapping calculations based on the default configuration: for voltage data, it maps the voltage values ​​of each channel output by the metering chip to the correct physical phase according to the saved voltage channel configuration; for current data, it rearranges or adjusts the phase of the current values ​​of each channel output by the metering chip according to the saved current phase sequence correspondence and current direction. Finally, the microcontroller outputs the calibrated correct electrical parameters, such as three-phase voltage, three-phase current, active power, reactive power, and power factor, ensuring the output signal is accurate.

[0040] Manual adjustment mode: In addition to automatic calibration, this invention also provides a manual adjustment mode. Operators can send manual configuration commands via a host computer communication interface, such as RS485 or Modbus-RTU protocol, or a local human-machine interface, such as buttons or a touchscreen, to directly modify the correspondence of voltage sampling channels, the correspondence of current phase sequence, or the current direction, and save these as the default configuration. The manual adjustment function is suitable for special scenarios such as three-phase imbalance, or complex situations that the automatic program cannot handle, further improving the flexibility and adaptability of the equipment.

[0041] In summary, the working process of the intelligent three-phase AC power transmitter of the present invention is as follows: The operator sets the DIP switch according to the load characteristics of the monitored equipment and activates the start trigger DIP switch. The microcontroller reads the three-phase voltage amplitude and determines whether they are consistent; if they are inconsistent, it controls the relay to swap the two ends of the sampling channel of the phase with the lowest amplitude. The microcontroller reads the phase angles of the three-phase voltage and determines whether the difference between adjacent phase angles is 120°; if not, it controls the relay to swap the sampling channels of phase B and phase C voltage. The microcontroller reads the phase angles of the three-phase current and performs a layered judgment: First, determine if the difference between adjacent phase angles is 120° to confirm if the phase sequence is correct. If the correct phase sequence is not met, further determine whether it is ±120° or ±240° to identify whether it is a correctable current phase sequence error; If the correctable condition is still not met, try phase angle ±180° phase by phase; If the value is ±120° or ±240°, the phase sequence is matched using six possible permutations and combinations. The microcontroller checks the phase angle difference between voltage and current based on the power positive and negative settings of the DIP switch; if it does not match, it adds or subtracts 180° from the overall phase angle of the three-phase current. The microcontroller saves the corrected configuration as the default configuration, remaps the original data according to this configuration, and outputs the corrected electrical parameters. If the calibration fails at any stage, the microcontroller will output an alarm signal to prompt the operator to check the external wiring.

[0042] This invention proposes an intelligent three-phase AC power transmitter, which adopts an architecture of voltage hardware switching and current software reconfiguration. By switching voltage sampling channels through relays and rearranging the current phase sequence and adjusting the current direction through microcontroller software, it achieves automatic hierarchical progressive correction of voltage phase sequence errors, current phase sequence errors, and current direction errors without interrupting power to the equipment or altering the external wiring. Furthermore, it allows for manual setting of the power characteristics of the monitored equipment via DIP switches to verify the correction results, effectively reducing the safety risks and power outage losses during on-site debugging and improving the automation and flexibility of the correction process.

[0043] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An intelligent three-phase AC power transmitter, characterized in that, include: The power metering chip is used to collect three-phase voltage and three-phase current signals and calculate relevant electrical parameters. A relay is connected between the three-phase voltage sampling channel and the voltage measurement port of the power metering chip, and is used to switch the connection relationship between the voltage sampling channel and the voltage measurement port of the power metering chip. A microcontroller is connected to the power metering chip and the relay respectively. The microcontroller determines whether there is a voltage phase sequence error, current phase sequence error or current direction error based on the electrical parameters read by the power metering chip. When a voltage phase sequence error exists, the connection relationship of the voltage sampling channel is corrected by controlling the relay to switch. When there is an error in the current phase sequence or the current direction, the logical correspondence of the current sampling channels is rearranged through software algorithms, or the current phase angle is mathematically transformed to obtain the corrected relevant electrical parameters.

2. The intelligent three-phase AC power transmitter according to claim 1, characterized in that, The microcontroller determines whether there is a voltage sampling channel misconnection by comparing the consistency of the three-phase voltage amplitudes. When the three-phase voltage amplitudes are inconsistent within a preset error range, it controls the relay to swap the two ends of the voltage sampling channel corresponding to the lowest amplitude and re-determines whether the three-phase voltage amplitudes are consistent.

3. The intelligent three-phase AC power transmitter according to claim 1, characterized in that, The microcontroller checks whether the phase angle difference between two adjacent phase voltages is within the allowable error range of 120° to determine whether the voltage phase sequence is correct. If the phase angle difference between two adjacent phase voltages does not meet the allowable error range of 120°, the microcontroller controls the relay to swap the sampling channels of two phase voltages and re-determines whether the phase angle difference between two adjacent phase voltages meets the requirements.

4. The intelligent three-phase AC power transmitter according to claim 1, characterized in that, The microcontroller checks whether the phase angle difference between two adjacent current phases is within the allowable error range of 120°. If so, it determines that the current phase sequence and direction are correct. If not, it further determines whether the phase angle difference between two adjacent current phases is within the allowable error range of ±120° or ±240° in order to identify the error type of incorrect phase sequence or reversed current direction.

5. The intelligent three-phase AC power transmitter according to claim 4, characterized in that, If the phase angle difference between two adjacent phase currents is not within the allowable error range of ±120° or ±240°, the microcontroller will sequentially add 180° and subtract 180° from the phase angle of each phase current in phases A, B, and C, while keeping the phase angles of the other two phase currents unchanged, and then re-determine whether the phase angle difference between two adjacent phase currents conforms to the preset allowable error range of ±120° or ±240°.

6. The intelligent three-phase AC power transmitter according to claim 4, characterized in that, When the phase angle difference between two adjacent phase currents is within the allowable error range of ±120° or ±240°, the microcontroller calculates the adjacent phase angle difference according to six permutation combinations of the phase angles corresponding to the three phase currents A, B, and C, selects the permutation combinations in which the adjacent phase angle differences all meet the 120° allowable error range, and re-establishes the correspondence between the three phase currents and the physical channels according to the permutation combinations.

7. The intelligent three-phase AC power transmitter according to claim 1, characterized in that, The intelligent three-phase AC power transmitter also includes a DIP switch connected to the microcontroller, the DIP switch comprising: The first DIP switch is used to trigger the microcontroller to perform operations to check and correct errors in the three-phase voltage phase sequence, current phase sequence, and current direction. The second DIP switch is used to set the positive and negative states of the active power of the device under test; The third DIP switch is used to set the positive and negative states of the reactive power of the device under test. When the microcontroller performs the correction operation, it verifies whether the phase angle difference between the three-phase voltage and the three-phase current matches the relationship between the positive and negative states of active power and reactive power set by the second and third DIP switch positions. If they do not match, increase or decrease the phase angles of all three-phase currents by 180° and check again; if they match, save the adjusted current phase angle configuration.

8. The intelligent three-phase AC power transmitter according to claim 1, characterized in that, The microcontroller saves the corrected voltage sampling channel configuration, current phase sequence correspondence, and current direction as the default configuration, and performs remapping calculations on the original electrical parameters read from the power metering chip based on the default configuration, and outputs the corrected relevant electrical parameters.

9. The intelligent three-phase AC power transmitter according to claim 1, characterized in that, The microcontroller also receives manual configuration commands through a host computer communication interface or a local human-machine interface. Based on the manual configuration commands, it directly modifies the correspondence of voltage sampling channels, the correspondence of current phase sequence, or the direction of current, and saves it as the default configuration.

10. The intelligent three-phase AC power transmitter according to claim 1, characterized in that, After receiving an external trigger signal, the microcontroller initiates a self-test and correction operation. The external trigger signal comes from a DIP switch, a host computer command, or a local button.

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