An intelligent electric meter wiring detection system and self-diagnosis method

Abstract

The application discloses a kind of intelligent electric meter wiring detection system and self-diagnosis method, comprising: processor unit and signal acquisition unit, the data collected by the signal acquisition unit is converted into digital signal by signal conversion circuit and is transmitted to processor unit, the digital signal is output by communication unit by the processor unit receiving current collection, and the processor unit judges that current intelligent electric meter line exists fault according to current collection digital signal, according to the operation result of received digital signal, the type of intelligent electric meter wiring fault is judged, and is output by communication module. Phase-by-phase excludes line connection problem, and then voltage error is judged, and the detection error caused by normal voltage fluctuation is excluded, then the voltage data of different time intervals collected by wiring row is respectively investigated, and then the meter outlet and meter inlet data are respectively investigated, to further accurately locate fault.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of intelligent electric meter detection, in particular to an intelligent electric meter wiring detection system and a self-diagnosis method. BACKGROUND

[0002] The traditional intelligent distribution terminal technology of power supply enterprises still stays in electric energy collection and reporting. Although several fusion terminals have appeared in recent years, the products are still in the exploratory stage. In particular, the terminal body is not strong enough in monitoring and detecting faults of connected intelligent electric meters and other distribution equipment. In addition, with the continuous development of operation and inspection technology, new operation and inspection devices of power systems are continuously developed and put into application, which reduces the operation and maintenance cost of power supply enterprises, but at the same time increases the burden of carrying operation and inspection devices, and increases the complexity of structure and the complexity and intricacy of operation and maintenance. At the same time, due to problems such as parameter error of electronic components, the existing power fusion terminal has the problems of single data source for fault screening, low accuracy of fault report, and difficulty in positioning fault line segment. SUMMARY

[0003] The present application is to overcome / resolve the problems of single data source, low accuracy of fault report, and difficulty in positioning fault line segment in the existing intelligent electric meter wiring fault detection method, and to provide an intelligent electric meter wiring detection system and a self-diagnosis method for automatically and accurately positioning faults according to multiple fault sources.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] An intelligent electric meter wiring detection system, comprising: a processor unit and a signal acquisition unit, the data acquired by the signal acquisition unit is converted into a digital signal by a signal conversion circuit and transmitted to the processor unit, the processor unit receives the currently acquired digital signal, and outputs the digital signal through a communication unit, and the processor unit judges that there is a fault in the current intelligent electric meter line according to the currently acquired digital signal, judges the type of intelligent electric meter wiring fault according to the operation result of the received digital signal, and outputs through the communication module. The processor is also connected with a power supply unit, the power supply unit includes a charging circuit and a lithium battery, the lithium battery is connected with the processor unit, one end of the charging circuit is connected with the commercial power and the other end is connected with the lithium battery, and the processor unit is powered by an information acquisition unit, a display unit, a data communication unit, a carrier wave communication unit and a Bluetooth communication unit. The charging circuit is connected with the lithium battery, the lithium battery is connected with the processor unit, the charging circuit is connected with the commercial AC 200V through the introduction of the wiring end, the charging circuit is stabilized and converted into direct current to charge the lithium battery, the lithium battery is reduced in voltage to supply power to the processor, and the processor supplies power to the entire new power fusion terminal circuit.

[0006] As preferred, the communication module includes a 5G communication module, a carrier communication module and a Bluetooth communication module, the processor unit is connected with the 5G communication module, the carrier communication module and the Bluetooth communication module respectively, the 5G communication module is used for detecting the system to establish a communication connection with an external server; the carrier communication module is used for detecting the system to establish a communication connection with an external carrier receiver, and the Bluetooth communication module is used for detecting the system to establish a communication connection with an external terminal device. By establishing three wireless communication channels of data communication unit, carrier communication unit and Bluetooth communication unit, the collection requirements of different data are facilitated, the data transmission mode is more flexible, thereby the effect of reducing the pressure of data transmission channel is achieved.

[0007] As preferred, the signal acquisition unit includes a three-phase four-wire terminal, which includes A / B / C phase current terminals, A / B / C phase voltage terminals and a zero line terminal. One end of the A / B / C phase current terminals, the A / B / C phase voltage terminals and the zero line terminal is connected with a signal conversion circuit, and the other end of the A / B / C phase current terminals, the A / B / C phase voltage terminals and the zero line terminal is connected with a three-phase four-wire intelligent electric meter outlet terminal. The first three-phase voltage and the first three-phase current data of the three-phase four-wire intelligent electric meter within a certain time interval are obtained. The signal conversion circuit includes a current transformer, a voltage transformer and an AD conversion circuit. The input end of the current transformer and the voltage transformer is connected with the three-phase four-wire terminal, and the output end of the voltage transformer and the current transformer is connected with the channel of the AD conversion circuit. When the power fusion terminal is running, the real-time analog signal collected by the three-phase four-wire terminal is converted into a digital signal by the AD conversion circuit and pushed to the processor unit.

[0008] As preferred, the signal acquisition unit includes an RS485 communication port, which is connected with a three-phase four-wire intelligent electric meter to obtain the active power, the reactive power, the power factor, the second three-phase current, the second three-phase voltage data and the alarm event of the three-phase four-wire intelligent electric meter within a certain time. The new power fusion terminal is connected with various devices in the distribution area through the RS485 communication interface, the RJ45 communication interface, the TX and RX interfaces, such as the intelligent electric meter, the residual current circuit breaker, the intelligent capacitor, the transformer oil temperature sensor and the cable in-out line temperature sensor, the photovoltaic data monitor, the vibration sensing monitor, the indoor temperature and humidity monitor and the network interface, to realize the function expansion of the power fusion terminal. The auxiliary input interface and the auxiliary output interface are connected with the output end of the on-off quantity signal or the control signal of the distribution area to obtain the on-off quantity signal and the control signal state of the distribution area.

[0009] As preferred, the processor unit stores the first three-phase voltage, the first three-phase current, the second three-phase voltage and the second three-phase current converted by the signal conversion circuit in the order of Ia, Ib, Ic and Ua, Ub, Uc respectively.

[0010] As preferred, the processor unit is further connected with a memory which stores the active power, the power factor, the reactive power, the second three-phase voltage, the second three-phase current and the alarm event pushed by the three-phase four-wire smart meter after data processing and transmitted through the RS485 communication port; and stores the first three-phase voltage and the second three-phase voltage transmitted through the three-phase four-wire smart meter terminal and introduced by the three-phase four-wire terminal. Multiple data sources are collected to facilitate data analysis.

[0011] A smart meter terminal detection self-diagnosis method for the smart meter terminal detection system.

[0012] As preferred, the method comprises the following steps:

[0013] Step S1: The detection system sends a data collection instruction to the three-phase four-wire smart meter, and the three-phase four-wire smart meter pushes the three-phase voltage data to the detection system after receiving the collection instruction. The processor unit receives the second three-phase voltage data and judges whether the second three-phase voltage data meets the first voltage threshold respectively; if yes, step S2 is executed; if no, error connection analysis is performed on the second three-phase voltage data.

[0014] Step S2: Extract a plurality of groups of second three-phase voltage data stored in the memory within a period of time, compare each voltage data in the second three-phase voltage data group, and if all data meet the first threshold, proceed to step S3; if there is a phase voltage data with 0V in the second three-phase data group, the processor determines that the phase connection is faulty.

[0015] Step S3: The processor unit receives the first three-phase voltage data and judges whether the first three-phase voltage data meets the first voltage threshold respectively; if yes, step S4 is executed; if no, error connection analysis is performed on the first three-phase voltage data.

[0016] Step S4: Extract a plurality of groups of first three-phase voltage data from the memory with a first time interval, judge whether the plurality of groups of first three-phase voltage data meet the first threshold, if all data meet the first threshold, proceed to step S5; if there is a phase voltage data with 0V in the first three-phase data group, the processor determines that the phase connection is faulty.

[0017] Step S5: extracting several groups of first three-phase voltage data in the memory with a second time interval, calculating the average voltage by phase respectively, obtaining first average voltage data; extracting several groups of second three-phase voltage data in the memory with a second time interval, calculating the average voltage by phase respectively, obtaining second average voltage data; extracting several groups of second three-phase voltage data in the memory with a third time interval and combining the second average voltage, calculating the average voltage by phase respectively, obtaining third average voltage; extracting several groups of three-phase voltage data collected from the output end of the smart meter in the memory with a third time interval and combining the second average voltage, calculating the average voltage by phase respectively, obtaining fourth average voltage; calculating according to the first average voltage data, the second average voltage data, the third average voltage data and the fourth average voltage data, and the calculation result is used for processor and meter wiring fault analysis. The first voltage threshold is between 240V and 180V, and the several groups of second three-phase voltage data stored in the memory within a period of time are 60 groups of second three-phase voltage data within 20 minutes of the memory; the appearance of 0V of a certain voltage indicates that there is a certain voltage that is normal or 0V in this time period, and it is inferred that the phase inlet or the internal connection line contact is poor or the wiring fault.

[0018] As preferred, the execution of error wiring analysis in step S1 includes: if the voltage values of the second three-phase voltage data are all 0V, the processor determines that the fault type is: distribution transformer power failure, smart meter inlet power disconnection or voltage transformer fault; and ends the fault type determination;

[0019] If one phase of the voltage values of the second three-phase voltage data is 0V and the other two phases are not 0V, the processor determines that the fault type is: smart meter inlet line disconnection, wiring disconnection or internal connection line disconnection fault; and ends the fault type determination; the execution of error wiring analysis in step S3 includes: if one phase of the voltage values of the first three-phase voltage data is 0V and the other two phases are not 0V, the processor determines that the fault type is: smart meter inlet line disconnection, wiring disconnection or internal connection line disconnection fault; and ends the fault type determination. When the voltage of a certain phase of the three-phase line is 0V or all the voltages are 0V, it should be that the connection line is disconnected or the electrical connection of a certain phase is disconnected.

[0020] As preferred, the calculation according to the first mean voltage data, the second mean voltage data and the third mean voltage data in step S5 is used for the processor and the fault analysis of the meter connection, including: judging whether the phase-to-phase difference between the first mean voltage and the second mean voltage is less than 0.9% of the first mean voltage; if yes, the self-diagnosis of the normal data is ended; if no, judging whether the phase-to-phase difference between the third mean voltage and the second mean voltage is less than 0.9% of the third mean voltage; if yes, the self-diagnosis of the normal data is ended; if no, judging whether the phase-to-phase difference between the third mean voltage and the fourth mean voltage is less than 0.9% of the fourth mean voltage; if yes, the self-diagnosis of the normal data is ended; if no, judging whether two phases of the third mean voltage are lower than 35% of the preset third mean voltage; if yes, the meter connection fault is determined; if no, judging whether two phases of the fourth mean voltage are lower than 35% of the preset fourth mean voltage; if yes, the meter fault is determined; otherwise, the self-diagnosis is ended. First, the voltage error is judged to exclude the detection error caused by the normal voltage fluctuation, then the voltage data collected by the line connection at different time intervals are respectively investigated, and then the meter outlet and meter inlet data are respectively investigated, so as to further accurately locate the fault.

[0021] Therefore, the present application has the following beneficial effects: (1) by establishing the multi-data source collection module, the data communication unit, the carrier communication unit and the Bluetooth communication unit, the multi-element data is collected and transported, the data transmission mode is more flexible, and the data transmission channel pressure is reduced. (2) The auxiliary input interface, the auxiliary output interface, the RS485 communication interface and the RJ45 communication interface are communicated with the transformer equipment, the transformer equipment state signal and the switching value signal are acquired, and the function expansion of the power fusion terminal is realized. (3) The line connection problem is excluded phase by phase, the voltage error is judged to exclude the detection error caused by the normal voltage fluctuation, then the voltage data collected by the line connection at different time intervals are respectively investigated, and then the meter outlet and meter inlet data are respectively investigated, so as to further accurately locate the fault. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural block diagram of the smart meter connection detection system of an embodiment of the present application.

[0023] Figure 2 is a smart meter connection detection system and a smart meter connection schematic diagram of an embodiment of the present application.

[0024] Figure 3 is a self-diagnosis method flow chart of the smart meter connection detection system of an embodiment of the present application.

[0025] In the figure: 1, three-phase four-wire terminal 2, current transformer 3, voltage transformer 4, charging circuit 5, lithium battery 6, processor unit 7, AD conversion circuit 8, keyboard input unit 9, display unit 10, data communication unit 11, carrier communication unit 12, Bluetooth communication unit 13, clock circuit 14, auxiliary input and output unit 15, RJ45\RS485\TX\RX\GND terminal 16, three-phase four-wire intelligent electric meter 17, detection system. DETAILED DESCRIPTION

[0026] The application will be further described below in conjunction with the drawings and specific embodiments.

[0027] Embodiment:

[0028] An intelligent electric meter wiring detection system, as shown in Figure 1 The signal acquisition unit acquires data, which is converted into digital signals by a signal conversion circuit and transmitted to the processor unit 6. The processor unit 6 receives the currently acquired digital signals, outputs them through a communication unit, and determines that the current intelligent electric meter line has a fault according to the currently acquired digital signals. According to the operation result of the received digital signals, the type of intelligent electric meter wiring fault is determined and output through the communication module. The communication module includes a 5G communication module, a carrier communication module, and a Bluetooth communication module. The processor unit 6 is connected to the 5G communication module, the carrier communication module, and the Bluetooth communication module. The 5G communication module is used to establish a communication connection between the detection system 17 and an external server. The carrier communication module is used to establish a communication connection between the detection system 17 and an external carrier receiver. The Bluetooth communication module is used to establish a communication connection between the detection system 17 and an external terminal device. By establishing three wireless communication channels of the data communication unit 10, the carrier communication unit 11, and the Bluetooth communication unit 12, the collection requirements of different data are facilitated, the data transmission mode is more flexible, and the effect of reducing the pressure of the data transmission channel is achieved.

[0029] The acquisition unit includes a three-phase four-wire terminal 1, which includes A / B / C phase current terminals, A / B / C phase voltage terminals and a zero line terminal, one end of which is connected with a signal conversion circuit, and the other end of which is used to be connected with a three-phase four-wire intelligent electric meter 16, so as to obtain first three-phase voltage and first three-phase current data of the three-phase four-wire intelligent electric meter 16 within a certain time interval. The signal conversion circuit includes a current transformer 2, a voltage transformer 3 and an AD conversion circuit 7, the input ends of the current transformer 2 and the voltage transformer 3 are connected with the three-phase four-wire terminal 1, and the output ends of the voltage transformer 3 and the current transformer 2 are respectively connected with channels of the AD conversion circuit 7. When the power fusion terminal is running, the three-phase four-wire terminal 1 collects real-time analog signals, which are converted into digital signals by the AD conversion circuit 7 and pushed to the processor unit 6. The processor unit 6 stores the first three-phase voltage, the first three-phase current, the second three-phase voltage and the second three-phase current converted by the signal conversion circuit in the form of Ia, Ib, Ic and Ua, Ub, Uc respectively according to the phase sequence.

[0030] The acquisition unit also includes an RS485 communication port, which is in communication connection with the three-phase four-wire intelligent electric meter 16, so as to obtain active power, reactive power, power factor, second three-phase current, second three-phase voltage data and alarm events of the three-phase four-wire intelligent electric meter 16 within a certain time. It also includes an auxiliary input interface, an auxiliary output interface and an RJ45 communication interface. The new power fusion terminal is connected with various devices of a power distribution area, such as an intelligent electric meter, a residual current circuit breaker, an intelligent capacitor, a transformer oil temperature sensor and a cable in-out line temperature sensor, a photovoltaic data monitor, a vibration sensing monitor, an indoor temperature and humidity monitor and a network interface, through the RS485 communication interface, the RJ45 communication interface, the auxiliary input and output unit 14, the RJ45\RS485\TX\RX\GND terminal 15, the TX and RX interfaces, so as to realize the functional expansion of the power fusion terminal. The auxiliary input interface and the auxiliary output interface are in communication connection with the output ends of the on-off quantity signal or the control signal of the area, so as to obtain the on-off quantity signal and the control signal state of the area.

[0031] The processor unit 6 is also connected with a memory, which stores active power, power factor, reactive power, second three-phase voltage, second three-phase current and alarm events transmitted by the three-phase four-wire intelligent electric meter 16 through the RS485 communication port after being processed by the processor; and stores the first three-phase voltage and the second three-phase voltage transmitted by the three-phase four-wire terminal 1 introduced through the terminal of the three-phase four-wire intelligent electric meter 16. Multiple data sources are collected, which is convenient for data analysis.

[0032] Also includes a keyboard input unit 8, the keyboard input unit 8 is connected with the processor unit, the processor unit accepts the standard threshold value input by the keyboard input unit 8, and then sends control instructions to control the built-in diagnostic circuit to perform corresponding operation actions, to solve the problems of new power fusion terminal fast screening intelligent electric meter error wiring and fault automatic screening, and improve the self-diagnosis ability of intelligent electric meter wiring fault. The processor unit is also connected with a clock circuit 13, which is calibrated with the cloud server time. Thus, the clock of the processor unit and the cloud server is synchronized.

[0033] The processor is also connected with a power supply unit, which includes a charging circuit 4 and a lithium battery 5. The lithium battery 5 is connected with the processor unit 6, and the charging circuit 4 is connected with the mains at one end and the lithium battery 5 at the other end. The processor unit 6 supplies power to the information acquisition unit, the display unit 9, the data communication unit 10, the carrier communication unit 11 and the Bluetooth communication unit 12. The charging circuit 4 is connected with the lithium battery 5, and the lithium battery 5 is connected with the processor unit 6. The charging circuit 4 is connected with the mains AC 200V through the introduction of the wiring end. The charging circuit 4 stabilizes and converts the alternating current into direct current to charge the lithium battery 5. The lithium battery 5 supplies power to the processor after voltage reduction, and the processor provides power to the entire new power fusion terminal circuit.

[0034] The embodiment also discloses a self-diagnosis method for intelligent electric meter wiring detection, which includes the following steps:

[0035] Step S1: The detection system 17 sends a data calling instruction to the three-phase four-wire intelligent electric meter 16. After receiving the calling instruction, the three-phase four-wire intelligent electric meter 16 pushes the three-phase voltage data Ua, Ub and Uc to the detection system 17. After receiving the second three-phase voltage data Ua, Ub and Uc, the processor unit 6 judges whether the second three-phase voltage data respectively satisfies 240V-180V. If yes, step S2 is executed. Otherwise, if Ua, Ub and Uc voltage values are all equal to 0V, the processor pushes fault information such as distribution transformer power failure, intelligent electric meter incoming line disconnection, voltage transformer 3 fault, and ends the error wiring analysis.

[0036] Otherwise 2: If one of Ua, Ub and Uc voltage values is equal to 0V, the processor pushes fault information such as intelligent electric meter incoming line disconnection, wiring disconnection or internal connection line disconnection, and ends the error wiring analysis.

[0037] Step S2: Extract 60 groups of stored second three-phase voltage data Ua, Ub, Uc in the memory within 20 minutes, compare the Ua, Ub, Uc voltage data in the second three-phase voltage data group, if the data all meet 240V-180V, go to step S3; if there is a phase voltage data in the second three-phase data group that the voltage appears normal and is "0V", the processor pushes the smart meter some phase in-line and internal connection line contact fault or wiring fault information, and ends the error wiring analysis;

[0038] Step S3: The processor unit 6 receives the three-phase four-wire terminal 1 Ua2, Ub2, Uc2 data, judges whether Ua2, Ub2, Uc2 data respectively meet 240V-180V; if yes, execute step S4:; if no: otherwise 1: Ua, Ub, Uc voltage value is equal to 240V-180V, but Ua2, Ub2, Uc2 voltage value is all equal to 0V, the processor pushes the smart meter fault information, and ends the error wiring analysis;

[0039] Otherwise 2: Ua, Ub, Uc voltage value is equal to 240V-180V, Ua2, Ub2, Uc2 voltage value is equal to 0V, the processor pushes the smart meter some phase out-line wiring fault or internal connection line loose fault information, and ends the error wiring analysis;

[0040] Step S4: Extract 60 groups of smart meter out-line collected voltage data Ua2, Ub2, Uc2 in the memory within 20 minutes, compare the voltage data Ua2, Ub2, Uc2, judge whether the voltage data Ua2, Ub2, Uc2 meet 240V-180V, if the data all meet, go to step S5; if a phase voltage data appears normal and is "0V", the processor pushes the smart meter some phase internal connection contact fault or wiring fault information, and ends the error wiring analysis;

[0041] Step S5: Extract 3 groups of Ua, Ub, Uc data of the three-phase four-wire smart meter 16 pushed in the last 60 seconds, 120 seconds, 180 seconds, calculate the average value according to the phase and temporarily store Ua3, Ub3, Uc3 for participating in calculation and analysis;

[0042] Extract 3 groups of data of Ua2, Ub2, Uc2 collected by the three-phase four-wire terminal 1 in the last 60 seconds, 120 seconds, 180 seconds, calculate the average value according to the phase and temporarily store Ua4, Ub4, Uc4 for participating in calculation and analysis;

[0043] Then, perform ±(Ua3-Ua4)≦Ua3×0.9%, ±(Ub3-Ub4)≦Ub3×0.9%, ±(Uc3-Uc4)≦Uc3×0.9% calculation and analysis, the data normal range self-diagnosis ends, otherwise;

[0044] The 300 seconds, 360 seconds, 480 seconds three groups of voltage data pushed by the smart meter are extracted again, combined with the 60 seconds, 120 seconds, 180 seconds three groups of data, and the average value is calculated again and temporarily stored as Ua5, Ub5, Uc5 to participate in calculation and analysis, and then the items are calculated again ± (Ua5-Ua4) ≦ Ua5x0.9%, ± (Ub5-Ub4) ≦ Ub5x0.9%, ± (Uc5-Uc4) ≦ Uc5x0.9%, and the data is normally diagnosed, otherwise;

[0045] The 300 seconds, 360 seconds, 480 seconds three groups of voltage data collected by the output end of the smart meter are extracted again, combined with the 60 seconds, 120 seconds, 180 seconds three groups of data, and the average value is calculated again and temporarily stored as Ua6, Ub6, Uc6 to participate in calculation and analysis, and then the items are calculated again ± (Ua5-Ua6) ≦ Ua6x0.9%, ± (Ub5-Ub6) ≦ Ub6x0.9%, ± (Uc5-Uc6) ≦ Uc6x0.9%, and the data is normally diagnosed, otherwise;

[0046] It is judged whether Ua5 < Ua5x35%, Ub5 < Ub5x35%, Uc5 < Uc5x35% are two items, if yes, the processor pushes the meter into the line fault, and the error connection analysis is ended, otherwise, it is judged again;

[0047] It is judged whether Ua6 < Ua6x35%, Ub6 < Ub6x35%, Uc6 < Uc6x35% are two items, if yes, the processor pushes the meter into the line fault, and the error connection analysis is ended, otherwise, the self-diagnosis is ended. First, the voltage error is judged to exclude the detection error caused by normal voltage fluctuation, then the voltage data collected by the line at different time intervals are investigated respectively, and then the meter output line and meter input line data are investigated respectively, so as to accurately locate the fault.

[0048] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

[0049] Although the terms current transformer 2, voltage transformer 3, AD conversion circuit 7, power fusion terminal, processor unit 6, etc. are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present application; any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. A smart meter wiring detection system, characterized by, The utility model relates to a kind of intelligent electric meter self-diagnosis system, including: Signal acquisition unit obtains the first three-phase voltage (Ua2, Ub2, Uc2) of electric meter outlet wiring column, first three-phase current (Ia2, Ib2, Ic2) by three-phase four-wire terminal, and second three-phase voltage (Ua, Ub, Uc), current, power and alarm event of electric meter are collected by RS485 port, and digital signal is transmitted to processor unit by signal conversion circuit; Processor unit stores two types of voltage and current data according to phase sequence, and executes phased diagnosis combined with historical data in memory: extract a plurality of sets of first three-phase voltage data in memory separated by second time interval, calculate mean voltage according to phase respectively, obtain first mean voltage data;Extract a plurality of sets of second three-phase voltage data (Ua, Ub, Uc) in memory separated by second time interval, calculate mean voltage according to phase respectively, obtain second mean voltage data;Extract a plurality of sets of second three-phase voltage data (Ua, Ub, Uc) in memory separated by third time interval and second mean voltage, calculate mean voltage according to phase respectively, obtain third mean voltage;Extract a plurality of sets of three-phase voltage data from the output end of intelligent electric meter in memory separated by third time interval and second mean voltage, calculate mean voltage according to phase respectively, obtain fourth mean voltage;According to the calculation of first mean voltage data, second mean voltage data, third mean voltage data and fourth mean voltage data, the calculation result is used for processor unit and electric meter wiring fault analysis;Including: whether the phase-by-phase difference value of first mean voltage and second mean voltage is less than 0.9% of first mean voltage;If yes, data normal self-diagnosis is ended;If not, whether the phase-by-phase difference value of third mean voltage and second mean voltage is less than 0.9% of third mean voltage;If yes, data normal self-diagnosis is ended;If not, whether the phase-by-phase difference value of third mean voltage and fourth mean voltage is less than 0.9% of fourth mean voltage;If yes, data normal self-diagnosis is ended;If not, whether two phases in third mean voltage are lower than 35% of preset third mean voltage, if yes, determine electric meter incoming line fault;If not, whether two items in fourth mean voltage are lower than 35% of preset fourth mean voltage, if yes, determine electric meter fault, otherwise, self-diagnosis is ended; Communication module realizes communication, outputs fault type and data.

2. The intelligent meter connection detection system of claim 1, wherein The communication module includes a 5G communication module, a carrier communication module, and a Bluetooth communication module. The processor unit is connected to the 5G communication module, the carrier communication module, and the Bluetooth communication module. The 5G communication module is used to detect the establishment of a communication connection between the system and an external server. The carrier communication module is used to detect the establishment of a communication connection between the system and an external carrier receiver. The Bluetooth communication module is used to detect the establishment of a communication connection between the system and an external terminal device.

3. The intelligent meter connection detection system of claim 2, wherein, The signal acquisition unit comprises a three-phase four-wire terminal, which comprises A / B / C phase current terminals, A / B / C phase voltage terminals and a zero line terminal, one end of the A / B / C phase current terminals, the A / B / C phase voltage terminals and the zero line terminal is connected with a signal conversion circuit, and the other end of the A / B / C phase current terminals, the A / B / C phase voltage terminals and the zero line terminal is connected with a three-phase four-wire intelligent electric meter outlet terminal, so as to obtain first three-phase voltage (Ua2, Ub2, Uc2) and first three-phase current (Ia2, Ib2, Ic2) data of the three-phase four-wire intelligent electric meter within a certain time interval.

4. The system for detecting the connection of a smart meter according to claim 3, wherein, The signal acquisition unit comprises an RS485 communication port, which is connected with the three-phase four-wire intelligent electric meter, so as to obtain active power, reactive power, power factor, second three-phase current (Ia, Ib, Ic), second three-phase voltage (Ua, Ub, Uc) data and alarm events of the three-phase four-wire intelligent electric meter within a certain time.

5. The intelligent meter connection detection system of claim 4, wherein, The processor unit stores the three-phase current and the three-phase voltage converted by the signal conversion circuit in the form of Ia, Ib, Ic and Ua, Ub, Uc respectively according to the phase sequence.

6. The system for detecting the connection of a smart meter according to claim 5, wherein, The processor unit is further connected with a memory, which stores active power, power factor, reactive power, second three-phase voltage (Ua, Ub, Uc), second three-phase current (Ia, Ib, Ic) and alarm events of the three-phase four-wire intelligent electric meter transmitted by the RS485 communication port after data processing by the processor unit, and stores the first three-phase voltage and the second three-phase voltage (Ua, Ub, Uc) transmitted by the three-phase four-wire intelligent electric meter terminal to the three-phase four-wire terminal.

7. A self-diagnosis method for the smart meter wiring detection system of any one of claims 1-6, wherein, The method comprises the following steps: In step S1, the detection system sends a data polling instruction to the three-phase four-wire intelligent electric meter, the three-phase four-wire intelligent electric meter pushes three-phase voltage data to the detection system after receiving the polling instruction, and the processor unit judges whether the second three-phase voltage data (Ua, Ub, Uc) respectively meet the first voltage threshold after receiving the second three-phase voltage data (Ua, Ub, Uc); if yes, step S2 is executed; if no, first error connection analysis is executed; In step S2, a plurality of second three-phase voltage data groups stored in the memory within a period of time are extracted, and each voltage data in the second three-phase voltage data group is compared; if all the data meet the first threshold, step S3 is entered; if there is voltage data of 0V in the second three-phase data group, the processor unit determines that the phase connection is faulty; In step S3, the processor unit receives the first three-phase voltage data, judges whether the first three-phase voltage data respectively meet the first voltage threshold; if yes, step S4 is executed; if no, second error connection analysis is executed; In step S3, the processor unit receives the first three-phase voltage data, judges whether the first three-phase voltage data respectively meet the first voltage threshold; if yes, step S4 is executed; if no, second error connection analysis is executed; Step S4, extract a number of groups of first three-phase voltage data in the memory with a first time interval, determine whether the number of groups of first three-phase voltage data meet the first threshold, if the data meet the first threshold, enter step S5; if there is a certain phase voltage data in the number of first three-phase data groups, the voltage appears 0V, the processor unit determines that the phase connection is faulty; Step S5, extract a number of groups of first three-phase voltage data in the memory with a second time interval, calculate the average voltage according to the phase respectively, obtain the first average voltage data; extract a number of groups of second three-phase voltage data (Ua, Ub, Uc) in the memory with a second time interval, calculate the average voltage according to the phase respectively, obtain the second average voltage data; extract a number of groups of second three-phase voltage data (Ua, Ub, Uc) in the memory with a third time interval and the second average voltage, calculate the average voltage according to the phase respectively, obtain the third average voltage; extract a number of groups of three-phase voltage data from the output end of the intelligent electric meter in the memory with a third time interval and the second average voltage, calculate the average voltage according to the phase respectively, obtain the fourth average voltage; calculate according to the first average voltage data, the second average voltage data, the third average voltage data and the fourth average voltage data, and the calculation result is used for processor unit and electric meter wiring fault analysis.

8. The method of self-diagnosis of the connection of the smart meter according to claim 7, characterized in that, The first error wiring analysis includes: if the voltage value of the second three-phase voltage data (Ua, Ub, Uc) is all 0V, the processor unit determines that the fault type is: distribution transformer power failure, intelligent electric meter power off or voltage transformer fault; and end the fault type determination; If the voltage value of the second three-phase voltage data (Ua, Ub, Uc) is one phase 0V and the other two phases are not 0V, the processor unit determines that the fault type is: intelligent electric meter line some phase off, wiring row fracture or internal connection line off fault; and End the fault type determination; The second error wiring analysis includes: if the voltage value of the first three-phase voltage data is one phase 0V and the other two phases are not 0V, the processor unit determines that the fault type is: intelligent electric meter line some phase off, wiring row fracture or internal connection line off fault; and end the fault type determination.

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