A data analysis management system and method for multifunctional instrument

Abstract

The present invention discloses a data analysis management system and method applied to a multifunctional instrument, and relates to the technical field of data analysis of a multifunctional instrument. The system comprises: a signal input module, a function module, an instrument data return module, a panel display information module and a data storage module; the output end of the signal input module is connected to the input end of the function module; the output end of the function module is connected to the input end of the instrument data return module; the output end of the instrument data return module is connected to the input end of the panel display information module; the signal input module, the function module, the instrument data return module and the panel display information module are respectively connected to the data storage module. The present invention can measure all commonly used power parameters with high precision; provide intelligent fault judgment, and can complete the networking of different PLC and industrial control computer communication software in the industry.

Description

Technical Field

[0001] The present invention relates to the technical field of data analysis of multifunctional instruments, and in particular to a data analysis management system and method applied to multifunctional instruments. Background Art

[0002] The multifunctional meter is designed for the power monitoring needs of power systems, industrial and mining enterprises, public facilities, and intelligent buildings. As an advanced intelligent digital power grid front-end acquisition component, it can measure all common power parameters with high precision, and use high-visibility LED or LCD to display the meter measurement parameter information, and can complete the industry's different PLC, industrial control computer communication software networking.

[0003] In the actual operation of multi-function instruments, it is easy for the instrument to fail to send back data; this is generally due to inaccurate connection of the communication bus, abnormal RS485 converter, or problems with the corresponding communication line and host computer software; however, since multi-function instruments are generally networked by several instruments, when problems occur in different numbers of multi-function instruments, they often correspond to different faults. At present, only manual judgment or step-by-step attempts are used to troubleshoot, and there is a lack of intelligent means of processing. Summary of the invention

[0004] The object of the present invention is to provide a data analysis management system and method applied to a multifunctional instrument to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solution: a data analysis and management system applied to a multifunctional instrument, the system comprising: a signal input module, a function module, an instrument data return module, a panel display information module and a data storage module;

[0006] The signal input module is used to determine the signal input wiring mode and receive voltage, current, frequency, power and electric energy data signals; the functional module is used to control the input and output of the switch quantity and the analog quantity transmission output; the instrument data feedback module is used to realize the instrument data communication and complete the communication, transmission and early warning of the instrument data; the panel display information module is used to provide data information feedback to the LED panel, display it to the user, and provide intelligent options; the data storage module is used to store the historical operation data of the instrument and build a cloud data platform;

[0007] The output end of the signal input module is connected to the input end of the functional module; the output end of the functional module is connected to the input end of the instrument data feedback module; the output end of the instrument data feedback module is connected to the input end of the panel display information module; the signal input module, functional module, instrument data feedback module and panel display information module are respectively connected to the data storage module.

[0008] According to the above technical solution, the signal input module includes a wiring monitoring unit and a signal measurement unit;

[0009] The wiring monitoring unit is used to set the signal input wiring mode, including three-phase four-wire, high-voltage three-phase four-wire, three-phase three-wire and high-voltage three-phase three-wire; the signal measurement unit adopts a calculation method of collecting each measurement channel separately, wherein the input voltage of the voltage input terminal should not be higher than the rated input voltage of the product; the current input terminal should not be higher than the standard rated input current; ensure that the input voltage and current correspond to each other, the order is consistent, and the incoming and outgoing directions are consistent;

[0010] The configuration of the signal measurement unit input network is determined by the number of CTs in the system. In the case of 2 CTs, the three-phase three-wire two-element method is selected; in the case of 3 CTs, the three-phase four-wire three-element method is selected. In the three-phase three-wire, the voltage is measured and displayed as the line voltage; in the three-phase four-wire, the voltage is measured and displayed as the phase voltage of the power grid.

[0011] The output end of the wiring monitoring unit is connected to the input end of the signal measuring unit.

[0012] According to the above technical solution, the functional module includes a switch quantity input and output unit and an analog quantity transmission and output unit;

[0013] The switch input and output unit is used to provide a maximum of 4 switch inputs and 4 switch outputs; the switch input is used to detect the switch state of an external passive switch. The instrument is equipped with a working power supply and does not require external power supply. When the switch is closed, the corresponding position of the switch display page of the instrument panel display information module is indicated by "1", and when the switch is disconnected, the corresponding position of the switch display page of the instrument panel display information module is indicated by "0". The status information is remotely transmitted through the RS485 communication interface; the switch output includes two modes: an alarm output mode for exceeding the upper and lower limits of the power and a communication remote control output mode;

[0014] The above-mentioned upper and lower limit alarm output mode of electric power refers to that when the measured electric parameter is lower than or higher than the set threshold value, the corresponding output node is connected; the above-mentioned communication remote control output mode refers to that the upper computer or the background monitoring system directly controls the opening and closing of the output contact through the 485 communication interface;

[0015] The analog quantity transmission output unit is used to convert the measured electrical quantity information into a DC current or DC voltage outputted in a linear proportion, and provides a maximum of 4 analog quantity output functions.

[0016] According to the above technical solution, the instrument data feedback module includes an instrument data communication unit and a feedback warning unit;

[0017] The instrument data communication unit is used to set the hardware connection, communication protocol and transmission mode; the hardware connection includes providing an asynchronous half-duplex RS485 communication interface, which is connected to the host computer or the background monitoring system. Various data information is transmitted on the communication line. Several instruments can be connected to one line at the same time, and each instrument is set with its communication address and communication rate; the line connection uses a twisted shielded pair cable with a shielded mesh; the communication protocol adopts the MODBUS-RTU protocol, and a master-slave response communication connection method is adopted on a communication line. The host's signal is addressed to a slave with a unique address, and the response signal sent by the slave is transmitted to the host in the opposite direction, that is: on a single communication line, the signal transmits all communication data streams in two opposite directions (half-duplex working mode). The MODBUS protocol only allows communication between the host (PC, PLC, etc.) and the terminal device, but does not allow data exchange between independent terminal devices, so that each terminal device will not occupy the communication line when they are initialized, but is limited to responding to the query signal reaching the local machine; the transmission method adopts an asynchronous method, in which the byte format is: 1 start bit, 8 data bits, no parity bit, 1 stop bit; the message format is: address code, function code, data code and check code.

[0018] According to the above technical solution, it also includes:

[0019] The address code consists of one byte. The address of each terminal device must be unique. Only the addressed terminal will respond to the query containing the address. When the terminal sends back a response, the slave address data in the response tells the host which terminal is communicating with it. The function code is used to feedback what function the addressed terminal performs. The data code contains the data required by the terminal to perform a specific function or the data collected when the terminal responds to the query. The check code is used for error checking and is determined by the CRC value. The CRC value is calculated by the transmission device and then attached to the data frame. The receiving device recalculates the CRC value when receiving data and compares it with the value in the received CRC field. If the two values ​​are not equal, it is determined that an error has occurred.

[0020] The process of generating a CRC is:

[0021] S5-1, preset a 16-bit register to FFFFH, recorded as CRC register;

[0022] S5-2, perform XOR operation on the 8 bits of the first byte in the data frame and the low byte in the CRC register, and store the result back into the CRC register;

[0023] S5-3, shift the CRC register rightward by one bit, fill the highest bit with 0, and shift out the lowest bit and detect;

[0024] S5-4, if the lowest bit shifted out is 0, repeat the shifting out of the lowest bit and detect it; if the lowest bit is 1, perform XOR operation on the CRC register and a preset fixed value 0A001H;

[0025] S5-5, repeat S5-3 and S5-4 until 8 shifts are completed, and a complete eight bits are processed and recorded;

[0026] S5-6, repeat S5-2 to S5-5 to process the next eight bits until all bytes are processed;

[0027] S5-7, the final value of the CRC register is the value of CRC;

[0028] The feedback warning unit is used to obtain the number of instruments that are judged to have errors and feed it back to the panel display information module.

[0029] According to the above technical solution, the panel display information module includes a panel display information unit and an intelligent processing unit;

[0030] The panel display information unit is used to construct various panel displays of instrument data and display them to users through the LED screen; the intelligent processing unit is used to provide intelligent options for intelligent selection;

[0031] The output end of the panel display information unit is connected to the input end of the intelligent processing unit.

[0032] According to the above technical solution, the data storage module is used to store the historical operation data of the instrument and provide training data for the intelligent processing unit to realize the construction of the intelligent selection model.

[0033] A data analysis and management method applied to a multifunctional instrument, the method specifically comprising:

[0034] S1. Determine the instrument signal input wiring method, receive voltage, current, frequency, power and electric energy data signals, and control the input and output of switch quantity and analog quantity transmission output;

[0035] S2. Build an instrument data communication system to complete the communication, transmission and early warning of instrument data, call the historical operation data of the instrument, and form an intelligent feedback model;

[0036] S3. Based on the intelligent feedback model, the panel display information module provides users with intelligent options for fault handling, forming a fully automated fault handling analysis.

[0037] According to the above technical solution, it specifically includes:

[0038] Call the historical operation data of the instrument, select the fault condition of the instrument return data, separate the fault type and the corresponding instrument return error number, and form a standard training data group [H0, L0, K0, M0];

[0039] Among them, H0 refers to the signal input wiring mode; L0 refers to the total number of instruments on the communication line; K0 refers to the number of instrument return errors; M0 refers to the fault type; the fault types include: communication bus connection error, RS485 converter signal abnormality, corresponding instrument address error and host computer software error;

[0040] In actual applications, if a large number of instruments report data errors, it is generally due to communication bus connection errors or RS485 converter signal abnormalities. If only a single block or a few instruments have communication abnormalities, it is usually necessary to check the corresponding communication lines first, and modify and exchange the slave addresses of normal instruments and abnormal instruments to test and eliminate or confirm the upper computer software problems, or test and eliminate or confirm the instrument failure by exchanging the installation positions of normal instruments and abnormal instruments.

[0041] In the historical operation data of the instrument, the standard training data group of the same fault type is placed in the same storage sample, and the signal input wiring mode is assigned a value. The same wiring mode is assigned the same value to form a new value set of input wiring mode, the total number of instruments on the communication line, and the number of instrument return errors. The value set is sequentially formed into a point (x0, y0, z0) in a three-dimensional coordinate system, where x0, y0, and z0 refer to the corresponding values ​​of the input wiring mode, the total number of instruments on the communication line, and the number of instrument return errors, respectively;

[0042] Get the signal input wiring mode of the current instrument, the total number of instruments on the communication line, and the number of instrument return errors, form the point in the three-dimensional coordinate system of the current instrument, and establish the distance between the point in the three-dimensional coordinate system of the current instrument and each stored sample:

[0043]

[0044] Where D represents the distance between the point in the three-dimensional coordinate system of the current instrument and each stored sample; x i ,y i 、z irepresents the i-th data point in a certain stored sample; a1, b1, c1 represent the corresponding values ​​of the signal input wiring mode of the current instrument, the total number of instruments on the communication line, and the number of errors sent back by the instrument; u refers to the total number of data points in a certain stored sample;

[0045] The fault type of the stored sample response corresponding to the minimum value of D is taken as the first item of the intelligent option and fed back to the panel display information module.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows: the multifunctional instrument of the present invention is designed for the power monitoring needs of power systems, industrial and mining enterprises, public utilities, and intelligent buildings. It can measure all commonly used power parameters with high precision; it uses a highly visible LED or LCD as a panel display to display the instrument measurement parameter information. It can directly replace auxiliary units such as conventional power transmitters, and on the premise of easy installation, simple wiring, convenient maintenance, and small engineering workload, it provides intelligent fault judgment, can complete the networking of different PLCs and industrial control computer communication software in the industry, quickly form data processing and analysis of the instrument, and can be applied to various control systems, substation automation systems, and distribution automation systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 The present invention is a schematic diagram of a signal input wiring method for a data analysis and management system applied to a multi-functional instrument. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Example: Figure 1 As shown, the present invention provides a data analysis and management system applied to a multifunctional instrument, the system comprising: a signal input module, a function module, an instrument data return module, a panel display information module and a data storage module;

[0050] The signal input module is used to determine the signal input wiring mode and receive voltage, current, frequency, power and electric energy data signals; the functional module is used to control the input and output of the switch quantity and the analog quantity transmission output; the instrument data feedback module is used to realize the instrument data communication and complete the communication, transmission and early warning of the instrument data; the panel display information module is used to provide data information feedback to the LED panel, display it to the user, and provide intelligent options; the data storage module is used to store the historical operation data of the instrument and build a cloud data platform;

[0051] The output end of the signal input module is connected to the input end of the functional module; the output end of the functional module is connected to the input end of the instrument data feedback module; the output end of the instrument data feedback module is connected to the input end of the panel display information module; the signal input module, functional module, instrument data feedback module and panel display information module are respectively connected to the data storage module.

[0052] The signal input module includes a wiring monitoring unit and a signal measuring unit;

[0053] The wiring monitoring unit is used to set the signal input wiring mode, including three-phase four-wire, high-voltage three-phase four-wire, three-phase three-wire and high-voltage three-phase three-wire; the signal measurement unit adopts a calculation method of collecting each measurement channel separately, wherein the input voltage of the voltage input terminal should not be higher than the rated input voltage of the product; the current input terminal should not be higher than the standard rated input current; ensure that the input voltage and current correspond to each other, the order is consistent, and the incoming and outgoing directions are consistent;

[0054] The configuration of the signal measurement unit input network is determined by the number of CTs in the system. In the case of 2 CTs, the three-phase three-wire two-element method is selected; in the case of 3 CTs, the three-phase four-wire three-element method is selected. In the three-phase three-wire, the voltage is measured and displayed as the line voltage; in the three-phase four-wire, the voltage is measured and displayed as the phase voltage of the power grid.

[0055] The output end of the wiring monitoring unit is connected to the input end of the signal measuring unit.

[0056] The functional module includes a switch quantity input and output unit and an analog quantity transmission and output unit;

[0057] The switch input and output unit is used to provide a maximum of 4 switch inputs and 4 switch outputs; the switch input is used to detect the switch state of an external passive switch. The instrument is equipped with a working power supply and does not require external power supply. When the switch is closed, the corresponding position of the switch display page of the instrument panel display information module is indicated by "1", and when the switch is disconnected, the corresponding position of the switch display page of the instrument panel display information module is indicated by "0". The status information is remotely transmitted through the RS485 communication interface; the switch output includes two modes: an alarm output mode for exceeding the upper and lower limits of the power and a communication remote control output mode;

[0058] The above-mentioned upper and lower limit alarm output mode of electric power refers to that when the measured electric parameter is lower than or higher than the set threshold value, the corresponding output node is connected; the above-mentioned communication remote control output mode refers to that the upper computer or the background monitoring system directly controls the opening and closing of the output contact through the 485 communication interface;

[0059] The analog quantity transmission output unit is used to convert the measured electrical quantity information into a DC current or DC voltage outputted in a linear proportion, and provides a maximum of 4 analog quantity output functions.

[0060] The instrument data feedback module includes an instrument data communication unit and a feedback warning unit;

[0061] The instrument data communication unit is used to set the hardware connection, communication protocol and transmission mode; the hardware connection includes providing an asynchronous half-duplex RS485 communication interface, which is connected to the host computer or the background monitoring system. Various data information is transmitted on the communication line. Several instruments can be connected to one line at the same time, and each instrument is set with its communication address and communication rate; the line connection uses a twisted shielded pair cable with a shielded net; the communication protocol adopts the MODBUS-RTU protocol, and a master-slave response communication connection mode is adopted on a communication line. The host's signal is addressed to a slave with a unique address, and the response signal sent by the slave is transmitted to the host in the opposite direction; the transmission mode adopts an asynchronous mode, in which the byte format is: 1 start bit, 8 data bits, no parity bit, and 1 stop bit; the message format is: address code, function code, data code and check code.

[0062] Also includes:

[0063] The address code consists of one byte. The address of each terminal device must be unique. Only the addressed terminal will respond to the query containing the address. When the terminal sends back a response, the slave address data in the response tells the host which terminal is communicating with it. The function code is used to feedback what function the addressed terminal performs. The data code contains the data required by the terminal to perform a specific function or the data collected when the terminal responds to the query. The check code is used for error checking and is determined by the CRC value. The CRC value is calculated by the transmission device and then attached to the data frame. The receiving device recalculates the CRC value when receiving data and compares it with the value in the received CRC field. If the two values ​​are not equal, it is determined that an error has occurred.

[0064] The process of generating a CRC is:

[0065] S5-1, preset a 16-bit register to FFFFH, recorded as CRC register;

[0066] S5-2, perform XOR operation on the 8 bits of the first byte in the data frame and the low byte in the CRC register, and store the result back into the CRC register;

[0067] S5-3, shift the CRC register rightward by one bit, fill the highest bit with 0, and shift out the lowest bit and detect;

[0068] S5-4, if the lowest bit shifted out is 0, repeat the shifting out of the lowest bit and detect it; if the lowest bit is 1, perform XOR operation on the CRC register and a preset fixed value 0A001H;

[0069] S5-5, repeat S5-3 and S5-4 until 8 shifts are completed, and a complete eight bits are processed and recorded;

[0070] S5-6, repeat S5-2 to S5-5 to process the next eight bits until all bytes are processed;

[0071] S5-7, the final value of the CRC register is the value of CRC;

[0072] The feedback warning unit is used to obtain the number of instruments that are judged to have errors and feed it back to the panel display information module.

[0073] The panel display information module includes a panel display information unit and an intelligent processing unit;

[0074] The panel display information unit is used to construct various panel displays of instrument data and display them to users through the LED screen; the intelligent processing unit is used to provide intelligent options for intelligent selection;

[0075] The output end of the panel display information unit is connected to the input end of the intelligent processing unit.

[0076] The data storage module is used to store the historical operation data of the instrument and provide training data for the intelligent processing unit to realize the model construction of intelligent selection.

[0077] In this embodiment, a data analysis and management method applied to a multifunctional instrument is also provided, and the method specifically includes:

[0078] S1. Determine the instrument signal input wiring method, receive voltage, current, frequency, power and electric energy data signals, and control the input and output of switch quantity and analog quantity transmission output;

[0079] S2. Build an instrument data communication system to complete the communication, transmission and early warning of instrument data, call the historical operation data of the instrument, and form an intelligent feedback model;

[0080] S3. Based on the intelligent feedback model, the panel display information module provides users with intelligent options for fault handling, forming a fully automated fault handling analysis.

[0081] Specifically include:

[0082] Call the historical operation data of the instrument, select the fault condition of the instrument return data, separate the fault type and the corresponding instrument return error number, and form a standard training data group [H0, L0, K0, M0];

[0083] Among them, H0 refers to the signal input wiring mode; L0 refers to the total number of instruments on the communication line; K0 refers to the number of instrument return errors; M0 refers to the fault type; the fault types include: communication bus connection error, RS485 converter signal abnormality, corresponding instrument address error and host computer software error;

[0084] In the historical operation data of the instrument, the standard training data group of the same fault type is placed in the same storage sample, and the signal input wiring mode is assigned a value. The same wiring mode is assigned the same value to form a new value set of input wiring mode, the total number of instruments on the communication line, and the number of instrument return errors. The value set is sequentially formed into a point (x0, y0, z0) in a three-dimensional coordinate system, where x0, y0, and z0 refer to the corresponding values ​​of the input wiring mode, the total number of instruments on the communication line, and the number of instrument return errors, respectively;

[0085] Get the signal input wiring mode of the current instrument, the total number of instruments on the communication line, and the number of instrument return errors, form the point in the three-dimensional coordinate system of the current instrument, and establish the distance between the point in the three-dimensional coordinate system of the current instrument and each stored sample:

[0086]

[0087] Where D represents the distance between the point in the three-dimensional coordinate system of the current instrument and each stored sample; x i ,y i 、z i represents the i-th data point in a certain stored sample; a1, b1, c1 represent the corresponding values ​​of the signal input wiring mode of the current instrument, the total number of instruments on the communication line, and the number of errors sent back by the instrument; u refers to the total number of data points in a certain stored sample;

[0088] The fault type of the stored sample response corresponding to the minimum value of D is taken as the first item of the intelligent option and fed back to the panel display information module.

[0089] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A data analysis and management system applied to a multifunctional instrument, characterized in that: The system includes: a signal input module, a function module, an instrument data return module, a panel display information module and a data storage module; The signal input module is used to determine the signal input wiring mode and receive voltage, current, frequency, power and electric energy data signals; the functional module is used to control the input and output of the switch quantity and the analog quantity transmission output; the instrument data feedback module is used to realize the instrument data communication and complete the communication, transmission and early warning of the instrument data; the panel display information module is used to provide data information feedback to the LED panel, display it to the user, and provide intelligent options; the data storage module is used to store the historical operation data of the instrument and build a cloud data platform; The output end of the signal input module is connected to the input end of the functional module; the output end of the functional module is connected to the input end of the instrument data feedback module; the output end of the instrument data feedback module is connected to the input end of the panel display information module; the signal input module, the functional module, the instrument data feedback module and the panel display information module are respectively connected to the data storage module; The system also includes: a data analysis and management method applied to a multifunctional instrument, the method specifically comprising: S1. Determine the instrument signal input wiring method, receive voltage, current, frequency, power and electric energy data signals, and control the input and output of switch quantity and analog quantity transmission output; S2. Build an instrument data communication system to complete the communication, transmission and early warning of instrument data, call the historical operation data of the instrument, and form an intelligent feedback model; S3. Based on the intelligent feedback model, the panel display information module provides users with intelligent options for fault handling, forming a fully automated fault handling analysis; Also includes: Call the historical operation data of the instrument, select the fault conditions of the instrument return data, separate the fault type and the corresponding instrument return error number, and form a standard training data set ; in, Refers to the signal input wiring method; Refers to the total number of instruments on the communication line; Refers to the number of errors reported by the instrument; Refers to the fault type; the fault types include: communication bus connection error, RS485 converter signal abnormality, corresponding instrument address error and host computer software error; In the historical operation data of the instrument, the standard training data group of the same fault type is placed in the same storage sample, and the signal input wiring mode is assigned a value. The same wiring mode is assigned the same value to form a new value set of input wiring mode, the total number of instruments on the communication line, and the number of instrument return errors. The value set is sequentially formed into a point in the three-dimensional coordinate system. ,in, They refer to the corresponding values ​​of the input wiring mode, the total number of instruments on the communication line, and the number of errors reported back by the instruments; Get the signal input wiring mode of the current instrument, the total number of instruments on the communication line, and the number of instrument return errors, form the point in the three-dimensional coordinate system of the current instrument, and establish the distance between the point in the three-dimensional coordinate system of the current instrument and each stored sample: ； in, Represents the distance between the point in the three-dimensional coordinate system of the current instrument and each stored sample; , , Represents the i-th data point in a stored sample; , , Represents the corresponding values ​​of the signal input wiring mode of the current instrument, the total number of instruments on the communication line, and the number of errors sent back by the instrument; u refers to the total number of data points in a certain storage sample; The fault type of the stored sample response corresponding to the minimum value of D is taken as the first item of the intelligent option and fed back to the panel display information module.

2. A data analysis and management system for a multifunctional instrument according to claim 1, characterized in that: The signal input module includes a wiring monitoring unit and a signal measuring unit; The wiring monitoring unit is used to set the signal input wiring mode, including three-phase four-wire, high-voltage three-phase four-wire, three-phase three-wire and high-voltage three-phase three-wire; the signal measurement unit adopts a calculation method of collecting each measurement channel separately, wherein the input voltage of the voltage input terminal should not be higher than the rated input voltage of the product; the current input terminal should not be higher than the standard rated input current; ensure that the input voltage and current correspond to each other, the order is consistent, and the incoming and outgoing directions are consistent; The configuration of the signal measurement unit input network is determined by the number of CTs in the system. In the case of 2 CTs, the three-phase three-wire two-element method is selected; in the case of 3 CTs, the three-phase four-wire three-element method is selected. In the three-phase three-wire, the voltage is measured and displayed as the line voltage; in the three-phase four-wire, the voltage is measured and displayed as the phase voltage of the power grid. The output end of the wiring monitoring unit is connected to the input end of the signal measuring unit.

3. A data analysis and management system for a multifunctional instrument according to claim 2, characterized in that: The functional module includes a switch quantity input and output unit and an analog quantity transmission and output unit; The switch input and output unit is used to provide a maximum of 4 switch inputs and 4 switch outputs; the switch input is used to detect the switch state of an external passive switch. The instrument is equipped with a working power supply and does not require external power supply. When the switch is closed, the corresponding position of the switch display page of the instrument panel display information module is indicated by "1", and when the switch is disconnected, the corresponding position of the switch display page of the instrument panel display information module is indicated by "0". The status information is remotely transmitted through the RS485 communication interface; the switch output includes two modes: an alarm output mode for exceeding the upper and lower limits of the electric quantity and a communication remote control output mode; The above-mentioned upper and lower limit alarm output mode of electric power refers to that when the measured electric parameter is lower than or higher than the set threshold value, the corresponding output node is connected; the above-mentioned communication remote control output mode refers to that the upper computer or the background monitoring system directly controls the opening and closing of the output contact through the 485 communication interface; The analog quantity transmission output unit is used to convert the measured electrical quantity information into a DC current or DC voltage outputted in a linear proportion, and provides a maximum of 4 analog quantity output functions.

4. A data analysis and management system for a multifunctional instrument according to claim 3, characterized in that: The instrument data feedback module includes an instrument data communication unit and a feedback warning unit; The instrument data communication unit is used to set the hardware connection, communication protocol and transmission mode; The hardware connection includes providing an asynchronous half-duplex RS485 communication interface, which is connected to a host computer or a background monitoring system. Various data information is transmitted on the communication line. Several instruments can be connected to one line at the same time, and each instrument is set with its communication address and communication rate; the line connection uses a twisted shielded pair cable with a shielded net; the communication protocol adopts the MODBUS-RTU protocol, and a master-slave response communication connection method is adopted on one communication line. The host's signal is addressed to a slave with a unique address, and the response signal sent by the slave is transmitted to the host in the opposite direction; the transmission method adopts an asynchronous method, in which the byte format is: 1 start bit, 8 data bits, no parity bit, and 1 stop bit; the message format is: address code, function code, data code and check code.

5. The data analysis and management system for multifunctional instrument according to claim 4, characterized in that: Also includes: The address code consists of one byte. The address of each terminal device must be unique. Only the terminal addressed will respond to the query containing the address. When the terminal sends back a response, the slave address data in the response tells the host which terminal is communicating with it. The function code is used to feedback what function the addressed terminal performs. The data code contains the data required by the terminal to perform a specific function or the data collected when the terminal responds to the query. The check code is used for error checking and is determined by using a CRC value. The CRC value is calculated by the transmission device and then attached to the data frame. The receiving device recalculates the CRC value when receiving data and then compares it with the value in the received CRC field. If the two values ​​are not equal, it is determined that an error has occurred. The process of generating a CRC is: S5-1, preset a 16-bit register to FFFFH, recorded as CRC register; S5-2, perform XOR operation on the 8 bits of the first byte in the data frame and the low byte in the CRC register, and store the result back into the CRC register; S5-3, shift the CRC register rightward by one bit, fill the highest bit with 0, and shift out the lowest bit and detect; S5-4, if the lowest bit shifted out is 0, repeat the shifting out of the lowest bit and detect it; if the lowest bit is 1, perform XOR operation on the CRC register and a preset fixed value 0A001H; S5-5, repeat S5-3 and S5-4 until 8 shifts are completed, and a complete eight bits are processed and recorded; S5-6, repeat S5-2 to S5-5 to process the next eight bits until all bytes are processed; S5-7, the final value of the CRC register is the value of CRC; The feedback warning unit is used to obtain the number of instruments that are judged to have errors and feed it back to the panel display information module.

6. The data analysis and management system for multifunctional instrument according to claim 5, characterized in that: The panel display information module includes a panel display information unit and an intelligent processing unit; The panel display information unit is used to construct various panel displays of instrument data and display them to users through the LED screen; the intelligent processing unit is used to provide intelligent options for intelligent selection; The output end of the panel display information unit is connected to the input end of the intelligent processing unit.

7. The data analysis and management system for multifunctional instrument according to claim 6, characterized in that: The data storage module is used to store the historical operation data of the instrument and provide training data for the intelligent processing unit to realize the model construction of intelligent selection.

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