Multifunctional portable cable alignment instrument circuit based on Lora technology

Abstract

The invention discloses a multifunctional portable cable alignment instrument circuit based on the Lora technology, and belongs to the technical field of alignment devices, the alignment instrument circuit is an alignment instrument host circuit, and the host circuit comprises a master control single-chip microcomputer, an LORA communication chip, a voltage boosting module, a function switching module and at least 20 alignment modules; the LORA communication chip is connected with the master control single-chip microcomputer and is used for communicating with a slave machine of the alignment instrument. The voltage boosting module is connected with the main control single chip microcomputer and the battery bus and is used for boosting a pulse signal of the main control single chip microcomputer into a 12V pulse signal; the function switching module is connected with the main control single chip microcomputer and the voltage boosting module and used for switching an alignment mode and a ground resistance measuring mode; and the alignment module is connected with the function switching module. The cable alignment instrument integrates three functions of inductive line tracking, line alignment identification and ground resistance measurement, and the three operation requirements can be met by using the portable cable alignment instrument, so that the measurement process is optimized, and the working efficiency of a user is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wire aligner, and in particular to a multifunctional portable cable aligning instrument circuit based on Lora technology. BACKGROUND

[0002] With the continuous development of power systems, whether it is the commissioning of newly built substations or the upgrading and reconstruction of existing substations, a large amount of cable laying work is inevitably involved. In this series of work, the accurate connection of the cable and the subsequent communication quality of the equipment are closely related, so the confirmation work of the equipment connected at both ends of the cable becomes the top priority. Considering that each cable contains several cable cores, and these cable cores are connected one by one through the interface of the equipment to realize stable communication between the equipment, it can be imagined that the complexity and delicacy of this work. In order to facilitate subsequent maintenance and repair work, the first and last ends of the cable are equipped with numbered sleeves to ensure accurate connection. However, in actual operation, workers face the following problems: The limited space in the screen cabinet makes it necessary to arrange and tightly bundle multiple cable lines together, and the cable layout often passes through areas that are difficult to observe directly, such as cable trenches. This space limitation and physical environment inconvenience make it difficult for workers to easily confirm the communication status of the cable at both ends when the equipment in the protection room is far away from the cable, and they have to rely on time-consuming and labor-intensive manual troubleshooting methods.

[0003] When facing a cable line with a length of hundreds of meters and containing dozens of same-color cable cores inside, the measurement of the line sequence becomes extremely tedious and time-consuming. The traditional working mode requires multiple workers to operate cooperatively, detect the line sequence of each cable core one by one, and then use communication tools to transfer and record information. In substations with a large number of equipment, such a working process undoubtedly increases the workload and time cost.

[0004] In the daily maintenance work of substations, fault troubleshooting is an important and frequent task. In this process, workers may encounter situations where the insulation performance of the cable core is declining, and at this time it is necessary to quickly and accurately confirm the ground insulation condition of the relevant cable. However, the traditional manual measurement method is inefficient and cannot meet the demand for rapid troubleshooting, while also consuming a large amount of human resources.

[0005] Based on this, the present application proposes a multifunctional portable cable aligning instrument circuit based on Lora technology. SUMMARY

[0006] The present application provides a multifunctional portable cable aligning instrument circuit based on Lora technology, which integrates inductive line searching, line identification, and ground resistance measurement.

[0007] According to an aspect of the present disclosure, a multifunctional portable cable line tester circuit based on Lora technology is provided, the line tester circuit is a line tester host circuit, the host circuit comprises: a master control single-chip microcomputer, a LORA communication chip, a voltage boosting module, a function switching module, and at least 20 line testing modules; The LORA communication chip is connected with the master control single-chip microcomputer and is used for communicating with a line tester slave; The voltage boosting module is connected with the master control single-chip microcomputer and a battery bus, and is used for boosting a pulse signal of the master control single-chip microcomputer into a 12V pulse signal; The function switching module is connected with the master control single-chip microcomputer and the voltage boosting module, and is used for switching a line testing mode and a ground resistance measurement mode; The line testing module is connected with the function switching module; The line testing module comprises a relay K1, and a line testing module circuit structure is as follows: One end of a resistor R6 is connected with the single-chip microcomputer, the other end of the resistor R6, one end of a resistor R11, and one end of a capacitor C1 are connected with a base of an NPN type triode Q1, the other end of the resistor R11 and the other end of the capacitor C1 and an emitter of the triode Q1 are grounded; a collector of the triode Q1 is connected with a pin 8 of the relay K1, the collector of the triode Q1 is connected with a positive electrode of a rectifier diode U1, a negative electrode of the rectifier diode U1 is connected to a pin 1 of the relay K1, a pin 3 of the relay K1 is connected with the function switching module, a pin 4 of the relay K1 is connected with a measured cable, and the pin 4 of the relay K1 is also connected to the ground through a nonlinear resistor R1.

[0008] In a possible implementation manner, a circuit structure of the voltage boosting module is as follows: One end of a resistor R66 is connected with a modulation pulse PWM pin of the single-chip microcomputer, the other end of the resistor R66 is connected with a base of an NPN type triode Q22, the base of the triode Q22 is grounded through a resistor R67, an emitter of the triode Q22 is grounded, a collector of the triode Q22 is connected with one end of a resistor R65, the other end of the resistor R65 is connected with a battery bus, the battery bus is also connected with a drain of a field effect transistor Q21, a gate of the field effect transistor Q21 is connected with the collector of the triode Q22, and a source of the field effect transistor Q21 outputs a 12V pulse signal to the voltage boosting module.

[0009] In a possible implementation manner, a circuit structure of the function switching module is as follows: One end of the resistor R69 is connected to the single-chip microcomputer, the other end of the resistor R69, one end of the resistor R70 and one end of the capacitor C26 are connected to the base of the NPN triode Q23, the other end of the resistor R70 and the other end of the capacitor C26 and the emitter of the triode Q23 are grounded; the collector of the triode Q23 is connected to the pin 8 of the relay K21, the collector of the triode Q23 is connected to the positive electrode of the rectifier diode U24, the negative electrode of the rectifier diode U24 is connected to the pin 1 of the relay K21, the pin 3 of the relay K21 is connected to the function switching module, the pin 4 of the relay K21 is connected to the signal output pin GD, and the pin 4 of the relay K21 is also grounded through the non-linear resistor R68.

[0010] In a possible implementation, the host circuit further comprises: a 600V voltage conversion module, a ground resistance measurement module; The 600V voltage conversion module comprises: a conduction sub-module and a voltage conversion sub-module, the conduction sub-module is connected with the battery bus and the single-chip microcomputer, the voltage conversion sub-module is connected with the conduction module, and the voltage conversion sub-module is further connected with the ground resistance measurement module; The conduction sub-module has the following structure: One end of the resistor R84 is connected to the single-chip microcomputer, the other end of the resistor R84 is connected to the base of the NPN triode Q25, the base of the triode Q25 is grounded through the resistor R86, the emitter of the triode Q25 is grounded, the collector of the triode Q25 is connected to one end of the resistor R82, the other end of the resistor R82 is connected to the battery bus, the battery bus is also connected to the drain of the field effect tube Q24, the gate of the field effect tube Q24 is connected to the collector of the triode Q24, and the source of the field effect tube Q24 outputs a 12V voltage to the voltage conversion sub-module; The voltage conversion sub-module has the following structure: The input pin Vin of the non-isolated DC voltage stabilizing power supply module is connected to the 12V output of the conduction sub-module, the GND pin 2 and the HGND pin 7 are grounded, the HV pin 6 outputs a 600V voltage, the Adj pin 4 is connected to one end of the 0 ohm resistor R73; the other end of the resistor R73 is connected to one end of the resistor R90 and one end of the resistor R81, the other end of the resistor R90 is grounded, and the other end of the resistor R81 is connected to the Vref pin 5 of the non-isolated DC voltage stabilizing power supply module.

[0011] In a possible implementation, the ground resistance measurement module comprises a test sub-module and an actual measurement sub-module connected through a connector, and has the following structure: The structure of the test sub-module or the actual measurement sub-module: the output pin 1 of the amplifier A of the double operational amplifier chip is connected to the sampling pin ADC1 of the single-chip microcomputer, the pin 1 is grounded through the series connection of the resistors R83, R78 and R77, the reverse input pin 2 of the amplifier A is grounded through the resistor R77, the same-phase input pin 3 of the amplifier A is connected to the connector through the resistors R79 and R74, the ground pin 4 of the amplifier A is grounded, the pin 8 is connected to the 4.8V power supply, and the pin 8 is also grounded through the capacitor C25; The points of the connector connected by the test sub-module and the actual measurement sub-module are connected to the signal output pin GD; The pins 1, 3 and 5 of the connector are connected to the measured resistor through the resistors R85, R87 and R98 respectively, and the pin 1 of the connector is connected to the 600V voltage output by the non-isolated direct-current stabilized power supply module through the series connection of the resistors R85 and R80.

[0012] In a possible implementation, the line matching instrument host circuit further comprises a signal generating module, which is configured to realize the line searching function of the line matching instrument host; The structure of the signal generating module is as follows: one end of the resistor R94 is connected to the modulation pulse PWM pin of the single-chip microcomputer, the other end of the resistor R94 is connected to the base of the NPN triode Q27, the base of the triode Q27 is grounded through the resistor R100, the emitter of the triode Q27 is grounded, the collector of the triode Q27 is connected to one end of the resistor R93, the other end of the resistor R93 is connected to the battery bus, the battery bus is also connected to the drain of the field effect transistor Q26, the gate of the field effect transistor Q26 is connected to the collector of the triode Q27, one end of the non-linear resistor R102 is connected to the source of the field effect transistor Q26, and the other end of the non-linear resistor R102 is connected to the cable interface and also grounded through the non-linear resistor R103.

[0013] The multi-functional portable cable line matching instrument circuit based on the Lora technology, the line matching instrument circuit is a line matching instrument slave circuit, and the slave circuit comprises a master control single-chip microcomputer, a LORA communication chip and at least 20 line matching modules; The LORA communication chip is connected with the master control single-chip microcomputer and is configured to communicate with the line matching instrument host; The at least 20 line matching modules are connected to the master control single-chip microcomputer; The structure of the line matching module is as follows: One end of the resistor R50 is connected to the measured cable, and the other end is connected to the base of the NPN triode Q20, the base of the triode Q20 is grounded through the non-linear resistor R55, the emitter of the triode Q20 is grounded through the resistor R60, the collector of the triode Q20 is connected to the 3.3V power supply, the emitter of the triode Q20 is connected to the cathode of the stabilized diode, and the anode of the stabilized diode is grounded.

[0014] Compared with the prior art, the beneficial effects of the present invention are: The cable sequencer employs high-frequency high-voltage pulse acquisition technology (line sequence measurement), a 12-bit successive approximation analog-to-digital converter (ADC), and low-frequency digital pulse induction technology (insulation resistance measurement). Through real-time detection of the induced pulse signal and single-point insulation resistance measurement of the connected cable by a master-slave unit, it can accurately confirm the cable sub-line sequence of unknown cables, and simultaneously measure the insulation resistance of the cable sub-line to ground. It also has a highly efficient inductive line-finding function, effectively solving the cable detection problem and improving the operation and maintenance level of the power system.

[0015] The cable matching instrument integrates three functions: inductive cable finding, cable identification, and ground resistance measurement. All three operational needs can be met by the portable cable matching instrument, which optimizes the measurement process and improves the work efficiency of users. Attached Figure Description

[0016] Figure 1 A block diagram of a pairing instrument host circuit according to an embodiment of the present disclosure is shown.

[0017] Figure 2 The diagram shows the pinout of the main control microcontroller of a pairing instrument host according to an embodiment of the present disclosure.

[0018] Figure 3 The diagram shows the pinout of the LoRa chip in a pairing instrument host according to an embodiment of the present disclosure.

[0019] Figure 4 The diagram shows a circuit diagram of the pairing module of a pairing device host according to an embodiment of the present disclosure.

[0020] Figure 5 The diagram shows a voltage boosting module circuit of a pairing instrument host according to an embodiment of the present disclosure.

[0021] Figure 6 The diagram shows a circuit diagram of the function switching module of a line-matching device host according to an embodiment of the present disclosure.

[0022] Figure 7 The circuit diagram of the conduction submodule of the main unit of the line matching instrument according to an embodiment of the present disclosure is shown.

[0023] Figure 8 The diagram shows a voltage conversion submodule circuit of a pairing instrument host according to an embodiment of the present disclosure.

[0024] Figure 9 The diagram shows a circuit diagram of the grounding resistance measurement module of the main unit of the line meter according to an embodiment of the present disclosure.

[0025] Figure 10 The diagram shows a circuit diagram of the signal generation module of a pairing instrument host according to an embodiment of the present disclosure.

[0026] Figure 11 The master single-chip microcomputer pin diagram of the line-locating slave machine according to an embodiment of the present disclosure is shown.

[0027] Figure 12 The LORA chip pin diagram of the line-locating slave machine according to an embodiment of the present disclosure is shown.

[0028] Figure 13 The line-locating module circuit diagram of the line-locating slave machine according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0029] Various exemplary embodiments, features, and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numbers in the drawings represent functionally the same or similar elements. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0030] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.

[0031] In addition, for the purpose of convenience and brevity, detailed descriptions of well-known functions and structures incorporated in the present disclosure can be omitted. It will be appreciated by those skilled in the art that the present disclosure can be practiced without these specific details. In some instances, well-known methods, procedures, components, and circuits have not been described in detail since they can hinder the understanding of the present disclosure.

[0032] Reference Figures 1-13 The function switching module of the line-locating master machine, when the signal of the single-chip microcomputer to the module (LJ_JDQ21) is low, the line-locating instrument is in the line-locating mode, and when the signal of the single-chip microcomputer to the module (LJ_JDQ21) is high, the line-locating instrument is in the ground resistance measurement mode. The single-chip microcomputer peripheral circuit of the line-locating master machine further includes a voltage conversion circuit, a filter circuit, a crystal oscillator circuit, and the like.

[0033] The signal generation module is used to generate signals of different frequencies for realizing the line searching function. When searching for a line, the staff at the other end of the cable relative to the line-locating master machine realizes accurate line searching through a high-sensitivity metal probe.

[0034] The voltage boosting module is used to boost the 3.3 V voltage of the single-chip microcomputer to 12 V.

[0035] The conduction submodule circuit diagram: when the 600V_IO pin of the single-chip microcomputer outputs a high level, the conduction submodule is turned on, and the voltage conversion submodule converts the 12 V voltage into a 600 V voltage.

[0036] The ground resistance measurement module includes two identical structures: test sub-module or actual measurement sub-module, two modules are selected by connector pin jump cap (one is for testing, one is for formal use).

[0037] (1) Single wire-to-ground insulation resistance measurement: According to the field investigation, in the process of implementing the defect elimination workflow in the station, the cable core insulation performance may be reduced. In order to quickly evaluate the ground insulation condition of the related cable, the device uses a high-voltage digital pulse signal module to control the voltage through a matched resistor to apply high voltage to the cable core. The main control single-chip microcomputer is not only connected with the voltage sampling unit, but also connected with the pulse generator, aiming to monitor the sampling voltage of the voltage sampling unit in real time. Once the sampling voltage of a sub-line reaches the preset high potential threshold, the main control single-chip microcomputer will immediately capture the voltage value of the sub-line at that time. Subsequently, the signal is processed by the operational amplifier for secondary amplification, and finally the main control single-chip microcomputer uses the ADC analog signal to perform digital signal sampling and processing operations, thereby providing a reliable basis for subsequent resistance value calculation.

[0038] The 12-bit successive approximation type analog-to-digital converter of the main control is used to accurately calculate the online feedback value. The resistance value is displayed in real time through the IPS touch screen, and the user of the device can accurately judge the insulation state of the cable core, thereby significantly improving the efficiency of fault elimination work.

[0039] The device constructs a set of multi-channel hardware sampling isolation circuit, which can perform ground resistance measurement on up to 20 cable sub-lines, detect the quality of the cable line, and find the damage of the cable during construction. Optimize the measurement process and improve the measurement efficiency.

[0040] (2) Wireless communication function: Currently, when performing the line work on site, multiple groups of unknown line sequences need to be measured. Considering that the length of a single cable bus may be hundreds of meters during on-site application, the staff need to hold a walkie-talkie and other communication equipment to measure and record one by one. From the distance and working environment, if wired form is used, not only will the line be too long, but also there is a high safety risk in the wiring process, which is not conducive to the recovery of the communication line. Therefore, this project does not consider using wired communication.

[0041] A set of communication modules based on Lora technology is carefully constructed between the host and slave, which has the remarkable characteristics of low delay and low power consumption. After the device is powered on, the host and slave immediately start data interaction through Lora communication and actively send connection information. After receiving the slave connection information, the portable cable pairing instrument host performs data verification, and if there is no error, it quickly replies with a connection success handshake signal to complete the connection confirmation between the two. After successful connection, the device will send a heartbeat response in a timing mechanism to ensure the stability of the connection is not disturbed. This stable communication link lays a solid foundation for subsequent cable pairing work and data display, ensuring accurate transmission and efficient processing of data in the entire workflow, greatly improving the intelligent level and work efficiency of cable detection work.

[0042] (3) Pairing function: In actual work scenarios, cable core line sequence measurement usually requires four workers to cooperate to complete, who need to detect the cable core one by one at both ends of the cable line and use a walkie-talkie to communicate the measured line sequence, and then record it. When the number of power plant equipment is large, this traditional line sequence measurement method has a huge workload and is time-consuming and laborious to operate.

[0043] When measuring the cable-to-ground insulation resistance of the portable cable pairing device, a high-performance 12-bit successive approximation analog-to-digital converter (ADC) is used, with a sampling rate of up to 1 microsecond / second, ensuring the accuracy and speed of measurement. To further improve measurement accuracy, a high-precision sampling circuit is designed, and a digital pulse signal as high as 600V is used as the test signal. In addition, the device also implements precise PWM pulse width modulation technology through the main control unit to provide a stable and reliable signal source output to the measured circuit, ensuring the accuracy and reliability of the measurement results.

[0044] The device uses low-frequency digital pulse technology, which has the characteristics of long period and pulse width, effectively solving the problem of signal attenuation in long cable lines. The hardware amplification circuit at the host end performs strong amplification processing on the signal to ensure stable transmission of the signal to the slave, thereby realizing accurate measurement and identification of the cable core by the host and slave.

[0045] In actual operation, the workflow is rigorous and orderly. First, the host sends the line-up instruction to the slave through the Lora communication module. The slave enters the line-up preparation state immediately after receiving the instruction. Then, the operator inputs the required line-up number on the host screen and clicks the start button. The host sends a carefully modulated low-frequency digital pulse signal to the slave. After successfully receiving the pulse signal, the slave identifies the line sequence information carried by the pulse through signal demodulation algorithm and returns the measured line sequence information to the host in time through Lora communication. After receiving the data, the host uses CRC algorithm for verification and careful comparison and analysis. After confirming the correctness, the host sends a handshake package to the slave, thus completing the entire line-up process. In the entire process, each link is closely connected, fully leveraging the technical advantages, greatly improving the accuracy and efficiency of cable line-up, and effectively ensuring the reliability and stability of cable connection in the power system.

[0046] The host and the slave are connected at both ends of the cable core, and are inserted in order according to the hole position. It can support the detection of multiple cable cores at the same time, and can detect up to 20 cable cores at a time. After completion, the corresponding serial number will be displayed on the screen.

[0047] (4) Line searching function: In practical application scenarios, in the face of space limitations, field operators often need to carefully arrange and bundle many cable lines to maintain the cleanliness of the site. However, the laying path of the cable line often passes through areas that are difficult to visually inspect, such as cable trenches and other hidden spaces, which poses a challenge to the verification of the communication status between remote protection equipment and indoor equipment. The device is designed with an induction circuit that can accurately identify the induced current in different line sequences and the accompanying electric field characteristics.

[0048] The device is equipped with a high-sensitivity metal detection head through a high-precision detection circuit, and the waveform of the line is detected and analyzed through an oscilloscope, and a detailed electric field distribution curve is constructed. On this basis, the dynamic characteristics of the electric field of the measured line in three-dimensional space, such as intensity change and directionality, are analyzed in depth. Then, the device compares these measured electric field change characteristics with the line searching reference established through a large number of experiments. This intelligent comparison process ensures that the device can accurately determine the tracking result of the measured line, even in complex wiring environments.

[0049] The device sends an alternating pulse signal at one end of the cable, and detects multiple cable lines one by one through an inductive handheld detector at the other end of the cable. When the alternating pulse signal is sensed, the status indicator light constantly emits an alarm prompt sound.

[0050] Table 1 Multi-gear induction analysis table , This design not only improves the accuracy and efficiency of cable management, especially in those difficult to directly access wiring scene, but also provides an efficient and reliable line tracking and verification means for operators.

[0051] Embodiments of the present disclosure have been described above, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles, practical applications, or technical improvements in the market of the embodiments, or to enable other ordinary skilled in the art to understand the embodiments disclosed herein.

Claims

1. A multi-functional portable cable alignment instrument circuit based on Lora technology, characterized in that, The pair of wire instrument circuit is a pair of wire instrument host circuit, and the host circuit comprises a master single-chip microcomputer, an LORA communication chip, a voltage boosting module, a function switching module, and at least 20 pairs of wire modules; The LORA communication chip is connected with the master single-chip microcomputer and is used for communicating with a pair of wire instrument slave; The voltage boosting module is connected with the master single-chip microcomputer and a battery bus, and is used for boosting a pulse signal of the master single-chip microcomputer into a 12V pulse signal; The function switching module is connected with the master single-chip microcomputer and the voltage boosting module, and is used for switching a pair of wire mode and a ground resistance measurement mode; The pair of wire module is connected with the function switching module; The pair of wire module comprises a relay K1, and a circuit structure of the pair of wire module is as follows: One end of a resistor R6 is connected with the single-chip microcomputer, the other end of the resistor R6, one end of a resistor R11 and one end of a capacitor C1 are all connected with a base of an NPN triode Q1, the other end of the resistor R11 and the other end of the capacitor C1 and an emitter of the triode Q1 are all grounded; a collector of the triode Q1 is connected with a pin 8 of the relay K1, the collector of the triode Q1 is connected with a positive electrode of a rectifier diode U1, a negative electrode of the rectifier diode U1 is connected to a pin 1 of the relay K1, a pin 3 of the relay K1 is connected with the function switching module, a pin 4 of the relay K1 is connected with a measured cable, and the pin 4 of the relay K1 is also connected to the ground through a nonlinear resistor R1.

2. The multi-functional portable cable pair tester circuit based on Lora technology according to claim 1, wherein, A circuit structure of the voltage boosting module is as follows: One end of a resistor R66 is connected with a modulation pulse PWM pin of the single-chip microcomputer, the other end of the resistor R66 is connected with a base of an NPN triode Q22, the base of the triode Q22 is grounded through a resistor R67, an emitter of the triode Q22 is grounded, a collector of the triode Q22 is connected with one end of a resistor R65, the other end of the resistor R65 is connected with a battery bus, the battery bus is also connected with a drain of a field effect tube Q21, a gate of the field effect tube Q21 is connected with the collector of the triode Q22, and a source of the field effect tube Q21 outputs a 12V pulse signal to the voltage boosting module.

3. The multi-functional portable cable pair tester circuit based on Lora technology according to claim 1, wherein, A circuit structure of the function switching module is as follows: One end of a resistor R69 is connected with the single-chip microcomputer, the other end of the resistor R69, one end of a resistor R70 and one end of a capacitor C26 are all connected with a base of an NPN triode Q23, the other end of the resistor R70 and the other end of the capacitor C26 and an emitter of the triode Q23 are all grounded; a collector of the triode Q23 is connected with a pin 8 of a relay K21, the collector of the triode Q23 is connected with a positive electrode of a rectifier diode U24, a negative electrode of the rectifier diode U24 is connected to a pin 1 of the relay K21, a pin 3 of the relay K21 is connected with the function switching module, a pin 4 of the relay K21 is connected with a signal output pin GD, and the pin 4 of the relay K21 is also connected to the ground through a nonlinear resistor R68.

4. The multi-functional portable cable pair tester circuit based on Lora technology according to claim 1, characterized in that, The host circuit further comprises a 600V voltage conversion module and a ground resistance measurement module; The 600V voltage conversion module comprises a conduction submodule and a voltage conversion submodule, the conduction submodule is connected with the battery bus and the single-chip microcomputer, the voltage conversion submodule is connected with the conduction module, and the voltage conversion submodule is also connected with the ground resistance measurement module; A structure of the conduction submodule is as follows: One end of the resistor R84 is connected to the single-chip microcomputer, the other end of the resistor R84 is connected to the base of the NPN triode Q25, the base of the triode Q25 is grounded through the resistor R86, the emitter of the triode Q25 is grounded, the collector of the triode Q25 is connected to one end of the resistor R82, the other end of the resistor R82 is connected to the battery bus, the battery bus is also connected to the drain of the field effect transistor Q24, the gate of the field effect transistor Q24 is connected to the collector of the triode Q24, the source of the field effect transistor Q24 outputs 12V voltage to the voltage conversion submodule; The voltage conversion submodule has the following structure: The input pin Vin of the non-isolated DC regulated power supply module is connected to the 12V output of the conduction submodule, the GND pin 2 and the HGND pin 7 are grounded, the HV pin 6 outputs 600V voltage, the Adj pin 4 is connected to one end of the 0 ohm resistor R73; the other end of the resistor R73 is connected to one end of the resistor R90 and one end of the resistor R81, the other end of the resistor R90 is grounded, and the other end of the resistor R81 is connected to the Vref pin 5 of the non-isolated DC regulated power supply module.

5. The multi-functional portable cable pair tester circuit based on Lora technology according to claim 1, wherein, The ground resistance measurement module includes a test submodule and an actual measurement submodule connected by a connector, and has the following structure: The structure of the test submodule or the actual measurement submodule: the output pin 1 of the amplifier A of the dual operational amplifier chip is connected to the sampling pin ADC1 of the single-chip microcomputer, and the pin 1 is grounded through the series connection of the resistor R83, the resistor R78 and the resistor R77; the reverse input pin 2 of the amplifier A is grounded through the resistor R77; the non-inverting input pin 3 of the amplifier A is connected to the connector through the resistor R79 and the resistor R74; the ground pin 4 of the amplifier A is grounded; the pin 8 is connected to a 4.8V power supply and also grounded through the capacitor C25; The points of the connector connected by the test submodule and the actual measurement submodule are connected to the signal output pin GD; The pin 1, the pin 3 and the pin 5 of the connector are connected to the measured resistor through the resistor R85, the resistor R87 and the resistor R98 respectively, and the pin 1 of the connector is connected to the 600V voltage output by the non-isolated DC regulated power supply module through the series connection of the resistor R85 and the resistor R80.

6. The multi-functional portable cable pair tester circuit based on Lora technology according to claim 1, wherein, The line finder host circuit further includes a signal generating module, which is used to realize the line searching function of the line finder host; The structure of the signal generating module is as follows: one end of the resistor R94 is connected to the modulation pulse PWM pin of the single-chip microcomputer, the other end of the resistor R94 is connected to the base of the NPN triode Q27, the base of the triode Q27 is grounded through the resistor R100, the emitter of the triode Q27 is grounded, the collector of the triode Q27 is connected to one end of the resistor R93, the other end of the resistor R93 is connected to the battery bus, the battery bus is also connected to the drain of the field effect transistor Q26, the gate of the field effect transistor Q26 is connected to the collector of the triode Q27, the source of the field effect transistor Q26 is connected to one end of the non-linear resistor R102, the other end of the non-linear resistor R102 is connected to the cable interface, and the other end of the non-linear resistor R102 is also grounded through the non-linear resistor R103.

7. A multi-functional portable cable alignment instrument circuit based on Lora technology, characterized in that, The alignment instrument circuit is an alignment instrument slave circuit, which comprises a master single-chip microcomputer, an LORA communication chip and at least 20 alignment modules. The LORA communication chip is connected with the master single-chip microcomputer and is used for communicating with an alignment instrument master. The at least 20 alignment modules are connected to the master single-chip microcomputer. The structure of the alignment module is as follows: One end of the resistor R50 is connected with a measured cable, and the other end is connected to the base of the NPN triode Q20. The base of the triode Q20 is grounded through a nonlinear resistor R55. The emitter of the triode Q20 is grounded through a resistor R60. The collector of the triode Q20 is connected with a 3.3V power supply. The emitter of the triode Q20 is connected with the cathode of a stabilizing diode. The anode of the stabilizing diode is grounded.

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