A device and method for checking polarity of a mutual inductor

Abstract

The present invention relates to the field of polarity verification technology, and specifically discloses a device and method for transformer polarity verification, including a host and a slave, the host including a host microcontroller, a host wireless communication module, a host power management module, a host button, a host ammeter and a host display screen, the slave including a slave microcontroller, a slave wireless communication module, a slave power management module, a slave button, a slave ammeter and a slave display screen, the host wireless communication module and the slave wireless communication module are used to realize wireless communication between the host and the slave, and the host microcontroller and the slave microcontroller are connected to each internal module through a serial port to realize input, output and judgment processing of signals. The present invention can quickly break a large current of 20A, is compact and portable, and can realize transformer polarity verification work within 200 meters of an open space between primary and secondary equipment and within 50 meters across floors.

Description

Technical Field

[0001] The present invention relates to the technical field of polarity verification, and in particular to a device and method for mutual inductor polarity verification. Background Art

[0002] Transformer polarity verification is an essential part of power grid construction and safe production. Taking State Grid Dalian Power Supply Company as an example, polarity verification is performed more than 10,000 times a year. Once the polarity is reversed, it will cause energy metering errors and power grid tripping, and even large-scale power outages.

[0003] The traditional transformer polarity check uses the DC battery method. Two No. 1 1.5V batteries are connected in series to the primary coil of the current transformer, and a low-range DC voltmeter or ammeter is connected to both ends of the secondary coil. When the circuit is connected, if the pointer is positive and the pointer is negative after the circuit is disconnected, it means that the transformer is in a negative polarity, otherwise it is in a positive polarity. The DC battery method is the most commonly used method on site. Its essence is to continuously short-circuit the dry battery and rely on rapid changes in current to cause changes in the AC transformer. However, this traditional method requires the cooperation of multiple people to operate together, which often leads to a series of problems such as external circuit disconnection, poor battery contact, sparks when the battery is turned on and off, and difficulty in troubleshooting. The fundamental reason is that the test instrument is not portable, troubleshooting is not intuitive, and the test process is slow and inefficient. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for transformer polarity verification, so as to solve the problems that traditional transformer polarity verification instruments are not portable, troubleshooting is not intuitive and the test efficiency is low.

[0005] In order to solve the above technical problems, the present invention provides a device for transformer polarity verification, characterized in that it includes a master and a slave;

[0006] The host includes a host microcontroller, a host wireless communication module, a host power management module, a host button, a host ammeter and a host display screen;

[0007] The slave includes a slave microcontroller, a slave wireless communication module, a slave power management module, a slave button, a slave ammeter and a slave display screen;

[0008] The host microcontroller and the slave microcontroller are used to input, output and analyze the signals;

[0009] The host wireless communication module and the slave wireless communication module include a host LoRa wireless communication antenna and a slave LoRa wireless communication antenna, which are used to realize wireless communication between the host and the slave;

[0010] The host microcontroller is connected to the host microcontroller, the host wireless communication module, the host power management module, the host button, the host ammeter and the host display screen through the serial port, and the slave microcontroller is connected to the slave microcontroller, the slave wireless communication module, the slave power management module, the slave button, the slave ammeter and the slave display screen through the serial port.

[0011] Preferably, the host microcontroller and the slave microcontroller are 90nm low-power microcontroller chips STMF, and the 90nm low-power microcontroller chips STMF include:

[0012] The core control unit is used to receive key input signals, control the coordinated work of other components, process data interaction between the host and slave, and analyze the results of transformer polarity verification;

[0013] Storage system, used to record the status and results of the verification;

[0014] SWD debugging interface, used for development and debugging;

[0015] The clock crystal oscillator is used to support the main frequency operation of the 90nm low-power microcontroller chip STMF.

[0016] Preferably, the host power management module and the slave power management module include a lithium battery, an inductor, a capacitor, a TX voltage regulator chip, an H charging protection chip and a Type-C interface.

[0017] Preferably, the host display screen and the slave display screen are LCD display screens for displaying time, battery power, device status, test information and polarity verification results.

[0018] Preferably, it also includes a host sound and light indication module and a slave sound and light indication module, which are used to emit a buzzer when the mutual inductor polarity check is successful, and make the host display screen and the slave display screen flash. The host microcontroller is connected to the host sound and light indication module through a serial port, and the slave microcontroller is connected to the slave sound and light indication module through a serial port.

[0019] Preferably, the host further comprises a host primary positive pole socket, a host primary negative pole socket, a host secondary positive pole socket and a host secondary negative pole socket, wherein the host primary positive pole socket and the host primary negative pole socket are used to connect to the primary side of the mutual inductor, and the host secondary positive pole socket and the host secondary negative pole socket are used to connect to the secondary side of the mutual inductor;

[0020] The slave also includes a slave secondary positive socket and a slave secondary negative socket, which are used to connect to the secondary side of the mutual inductor;

[0021] The host microcontroller is connected to the host primary positive socket, the host primary negative socket, the host secondary positive socket and the host secondary negative socket through the serial port, and the slave microcontroller is connected to the slave secondary positive socket and the slave secondary negative socket through the serial port.

[0022] Preferably, the host button and the slave button are made of MOS tubes;

[0023] The host buttons include a host power button, a local / remote button, a host check button, a self-check button and a check / self-check knob, and the slave buttons include a slave power button and a slave check button;

[0024] The local / remote button is used to switch the working mode to local mode or remote mode. The host check button and self-check button are effective in local mode, and the slave check button is effective in remote mode.

[0025] A method for checking the polarity of a mutual inductor comprises the following steps:

[0026] S1, the host primary positive socket, the host primary negative socket, the host secondary positive socket and the host secondary negative socket are connected to the primary side of the transformer through wires, and the slave secondary positive socket and the slave secondary negative socket are connected to the device to be tested connected to the secondary side of the transformer through wires;

[0027] S2. Press the host power button and the slave power button to turn on the device. Press the local / remote button to switch the device working mode to the remote mode. The wireless communication function is turned on. The host microcontroller sends a device search signal through the host wireless communication module to detect whether the slave is online. When the slave is found, the host and the slave establish communication through the wireless communication module.

[0028] S3. Turn the check / self-check knob to check, the host check button is locked, press the slave check button, the slave sends a start check signal to the host, the host provides auxiliary current to the primary side of the transformer, the secondary side of the transformer generates a corresponding induced current, the slave ammeter detects the current change, the slave microcontroller obtains the current signal detected by the slave ammeter through the serial port and analyzes and processes it into a polarity check result, the slave polarity check result signal is transmitted to the host through the wireless communication module, and the host display and the slave display show the polarity check result of the device to be checked.

[0029] Preferably, in step S2, the device is turned on, the check / self-check knob is first rotated to the self-check position, the local / remote button is pressed to switch the working mode to the local mode, the self-check button is pressed, and the host microcontroller sends a current detection signal. If there is no short circuit in the primary circuit of the transformer, the host microcontroller determines that the self-check has passed, and the host display screen displays "self-check successful". If there is a short circuit in the primary circuit of the transformer, the host microcontroller determines that the self-check has not passed, and the host display screen displays "self-check failed". When the self-check is successful, the transformer polarity check is performed.

[0030] Preferably, in the local mode, the primary positive pole socket and the primary negative pole socket of the host are connected to the primary side of the mutual inductor, the secondary positive pole socket and the secondary negative pole socket of the host are connected to the secondary side of the mutual inductor, the host microcontroller receives the input signal of the host verification button, the primary positive pole socket and the primary negative pole socket of the host apply current assistance to the mutual inductor, the host ammeter obtains the current direction of the secondary side of the mutual inductor through the secondary positive pole socket and the secondary negative pole socket of the host, the host microcontroller obtains the current direction signal of the host ammeter through the serial port, and converts it into a digital signal for internal analysis and processing, and displays the polarity of the mutual inductor on the host display screen according to the analysis and processing result;

[0031] In remote mode, the host microcontroller establishes a connection with the slave through the host LoRa wireless communication antenna. The host exchanges polarity check confirmation signals with the slave at a frequency of 20 milliseconds through half-duplex communication, which is implemented 5 times in total. When the polarity check results returned by the slave are consistent for 4 of them, the polarity check result is determined to be valid, otherwise the polarity check is determined to have failed, and the check result is displayed on the host display and the slave display.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention innovatively uses MOS tubes to replace mechanical switches, solves the problem of mechanical contact burning, can quickly break 20A high current, and the MOS tube has fast response, long life, and low energy consumption, which can improve the performance and reliability of the device; the wireless communication between the host and the slave adopts a half-duplex communication mode, both communicating parties can send and receive information, but at the same time, only one party can send information and the other party can receive information, effectively preventing erroneous confirmation of information; the present invention is compact and portable, can be operated by one person with one hand, supports multiple troubleshooting modes and working modes, saves labor costs, and greatly shortens the verification period; the present invention integrates portability, lightweight, integration and intelligence, is suitable for polarity verification of 10KV zero-sequence current transformers, and is used in conjunction with a small current grounding line selection device to reliably ensure the safe and stable operation of the power grid, and can realize the polarity verification of transformers within 200 meters of an open space between primary and secondary equipment and within 50 meters across floors. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the working state of an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the surface structure of a host according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the surface structure of a slave device according to an embodiment of the present invention;

[0037] Figure 4 A diagram of a host function module according to an embodiment of the present invention;

[0038] Figure 5 A diagram of a slave function module according to an embodiment of the present invention;

[0039] Figure 6 A circuit diagram of a 90nm low-power microcontroller STM32F103 of a host microcontroller according to an embodiment of the present invention;

[0040] Figure 7 A circuit diagram of a voltage stabilizing part of a host power management module and a slave power management module according to an embodiment of the present invention;

[0041] Figure 8 A circuit diagram of a charging protection part of a host power management module and a slave power management module according to an embodiment of the present invention;

[0042] Fig. 9 A circuit diagram of a host display screen and a slave display screen according to an embodiment of the present invention;

[0043] Fig.10 A circuit diagram of a buzzer driving circuit of a host sound and light indication module and a slave sound and light indication module according to an embodiment of the present invention;

[0044] Fig.11 A circuit diagram 1 of a host key and a slave key of an embodiment of the present invention;

[0045] Fig.12 It is a circuit diagram II of the host button and the slave button of an embodiment of the present invention;

[0046] Fig.13 The circuit diagram III of the master key and the slave key of the embodiment of the present invention;

[0047] Fig.14 A circuit diagram of a host wireless communication module and a slave wireless communication module according to an embodiment of the present invention;

[0048] Fig.15 The figure is a schematic diagram of the communication functions of the host wireless communication module and the slave wireless communication module according to an embodiment of the present invention.

[0049] In the figure, 1. host; 2. slave; 3. host LoRa wireless communication antenna; 4. slave LoRa wireless communication antenna; 5. host display screen; 6. slave display screen; 7. host ammeter; 8. slave ammeter; 9. host power button; 10. local / remote button; 11. host calibration button; 12. self-test button; 13. calibration / self-test knob; 14. slave power button; 15. slave calibration button; 16. host primary positive socket; 17. host primary negative socket; 18. host secondary positive socket; 19. host secondary negative socket; 20. slave secondary positive socket; 21. slave secondary negative socket; 22. charging port. DETAILED DESCRIPTION

[0050] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0051] This embodiment provides a device for checking the polarity of a mutual inductor, such as Figure 1-3 As shown, it includes a master 1 and a slave 2.

[0052] The host 1 includes a host microcontroller, a host wireless communication module, a host power management module, a host button, a host ammeter 7 and a host display screen 5. The functional modules are as follows: Figure 4 As shown;

[0053] The slave 2 includes a slave microcontroller, a slave wireless communication module, a slave power management module, a slave button, a slave current meter 8 and a slave display screen 6. The functional modules are as follows: Figure 5 shown.

[0054] The host wireless communication module and the slave wireless communication module include a host LoRa wireless communication antenna 3 and a slave LoRa wireless communication antenna 4, which are used to realize wireless communication between the host 1 and the slave 2. The circuit diagram is shown in FIG. Fig.14 As shown, the host microcontroller and the slave microcontroller control the wireless communication module through the serial ports USART1 TX and USART1 RX, with a rate of 9600bps and an operating frequency of 470Mhz. The wireless communication adopts half-duplex mode, the communication frequency is once every 20 milliseconds, and the information is transmitted 5 times, that is, a confirmation every 100 milliseconds. As long as 4 out of 5 information transmissions are the same information, the relevant information is confirmed, such as Fig.15 As shown, to prevent false confirmation of information, this method can achieve reliable transmission and remote control within a range of 50 meters across floors and walls.

[0055] The host microcontroller is connected to the host microcontroller, the host wireless communication module, the host power management module, the host button, the host ammeter 7 and the host display screen 5 through the serial port, and the slave microcontroller is connected to the slave microcontroller, the slave wireless communication module, the slave power management module, the slave button, the slave ammeter 8 and the slave display screen 6 through the serial port.

[0056] The host microcontroller and the slave microcontroller are used to input, output and analyze the signal. The host microcontroller and the slave microcontroller are 90nm low-power microcontroller chips STM32F103, which makes the whole machine power consumption low. The circuit diagram is as follows Figure 6 As shown, the 90nm low-power microcontroller chip STM32F103 includes:

[0057] The core control unit is used to receive key input signals, control the coordinated work of other components, process the data interaction between the host 1 and the slave 2, and determine the polarity verification results of the transformer;

[0058] Storage system, used to record the status and results of the verification;

[0059] SWD debugging interface, used for development and debugging;

[0060] Clock crystal oscillator: 8MHz clock crystal oscillator is used to support the main frequency operation of 90nm low-power microcontroller chip STM32F103, and 32.768kHz crystal oscillator is used to achieve low power mode and timing function;

[0061] The reset button NRST is used to reset the initial state.

[0062] The host 1 and the slave 2 also include a host sound and light indication module and a slave sound and light indication module, the circuit diagram is as shown in Fig.10 As shown, the pull-up resistor R11 transistor 9013 is used to drive the buzzer Butte, which is used to emit a buzzer sound when the mutual inductor polarity check is successful, and make the host display screen 5 and the slave display screen 6 flash. The host microcontroller is connected to the host sound and light indication module through the serial port, and the slave microcontroller is connected to the slave sound and light indication module through the serial port.

[0063] The host power management module and the slave power management module include lithium batteries, inductors, capacitors, TX4401 voltage regulator chips, 4056H charging protection chips and Type-C interfaces. The lithium batteries are charged by connecting the charging cable through the charging port 22Type-C interface. Figure 8As shown in the figure, LED, inductor, capacitor and 4056H charging protection chip are used to complete the protection function of lithium battery. LED lights are set inside the host 1 and slave 2. When the red LED, Red-LED2, is on, it means charging is in progress. When the blue LED, Blue-LED1, is on, it means charging is complete. When the LED lights are on, the light can be seen by the operator through the gap between the host 1 and slave 2 shells. Figure 7 As shown, the TX4401 voltage regulator chip limits the voltage to 3.3V, the host power management module provides power for the host microcontroller, the host wireless communication module, the host sound and light indication module and the host display screen 5, and the slave power management module provides power for the slave microcontroller, the slave wireless communication module, the slave sound and light indication module and the slave display screen 6.

[0064] The host display screen 5 and the slave display screen 6 are LCD display screens, and the circuit diagram is as follows Fig. 9 As shown, it is used to display time, battery power, device status, test information and polarity verification results. The time display format is: yyyy year mm month dd day hh hour mm minute ss second. The battery display power format is: XX%. The host 1 device status includes: verification-local-online, verification-local-single machine, self-test-local-online, self-test-local-online, verification-remote-online, verification-remote-single machine, self-test-remote-online, self-test-remote-single machine, a total of 8 states. The host 1 test information includes: self-test success, self-test failure, slave found, slave not found yet, local verification once, remote verification once, local verification locked and remote verification locked. The slave 2 device status includes: single machine status and online status. The slave 2 test information includes: remote verification once and host locking this function. The polarity verification results include: correct mutual inductor polarity, reverse mutual inductor polarity and mutual inductor polarity verification failure.

[0065] The host 1 also includes a host primary positive socket 16, a host primary negative socket 17, a host secondary positive socket 18 and a host secondary negative socket 19. The host primary positive socket 16 and the host primary negative socket 17 are used to connect the primary side of the mutual inductor, and the host secondary positive socket 18 and the host secondary negative socket 19 are used to connect the secondary side of the mutual inductor. The slave 2 also includes a slave secondary positive socket 20 and a slave secondary negative socket 21, which are used to connect the secondary side of the mutual inductor. The host microcontroller is connected to the host primary positive socket 16, the host primary negative socket 17, the host secondary positive socket 18 and the host secondary negative socket 19 through a serial port, and the slave microcontroller is connected to the slave secondary positive socket 20 and the slave secondary negative socket 21 through a serial port.

[0066] The host button and the slave button are made of MOS tubes. Using MOS tubes to replace mechanical switches solves the problem of mechanical contact burning and can quickly break a large current of 20A. The MOS tube has a fast response, a long life, and low energy consumption, which can improve the performance and reliability of the device. The host button includes a host power button 9, a local / remote button 10, a host check button 11, a self-check button 12, and a check / self-check knob 13. The slave button includes a slave power button 14 and a slave check button 15.

[0067] The host power button 9 and the slave power button 14 are self-locking buttons, used to turn the power on and off;

[0068] The local / remote button 10 is used to switch the working mode to the local mode or the remote mode. The host check button 11 and the self-check button 12 are effective in the local mode, and the slave check button 15 is effective in the remote mode;

[0069] The local / remote button 10 is a self-locking button. When it is popped up, it is in local mode. In this mode, the device turns off the remote wireless function and can only perform polarity verification of the host 1 single transformer locally; pressing the button is in remote mode. In this mode, the wireless communication function is turned on to search for devices. When the slave 2 is in wireless mode and the distance is suitable, that is, ≤200 meters in an open space and ≤50 meters across floors and walls, a search is refreshed at a frequency of 20 milliseconds. Once the device search is successful, the host display 5 displays "Slave found" and "Verification-Remote-Online", and the slave display 6 displays "Online Status".

[0070] The host check button 11 is a non-self-locking button. When the host 1 is in local mode, press the host check button 11, and the host primary jack passes through the transformer through a 4mm test line to perform short-term transformer current assistance. The host secondary jack is connected to the secondary side of the transformer through a 4mm test line, and the other end is connected to the host ammeter 7. Once the current assistance is successful, the host ammeter 7 deflects once. According to the deflection, the polarity of the transformer can be determined. When in remote mode, the host check button 11 of the host 1 is locked, and the polarity check is performed by receiving the polarity check signal sent by the remote slave 2;

[0071] The slave verification button 15 is a non-self-locking button. When the host 1 is in the local mode, the slave verification button 15 is locked. When the slave verification button 15 is pressed, the slave display screen 6 displays: the host locks this function. When the host 1 is in the remote mode, the slave verification button 15 is valid.

[0072] The self-test button 12 is a non-self-locking button. When the check / self-test knob 13 is rotated to the self-test function, the self-test button 12 function takes effect. Press the self-test button 12. If there is no short circuit in the primary circuit, the host display 5 will display "Self-test successful". If there is a short circuit in the primary circuit, the host display 5 will display "Self-test failed".

[0073] The check / self-check knob 13 is rotated to the check position, and the check function is performed in cooperation with the host check button 11 or the slave check button 15. The check / self-check knob 13 is rotated to the self-check position, and in cooperation with the self-check button 12, the host 1 performs an external circuit on-off detection.

[0074] A method for checking the polarity of a mutual inductor comprises the following steps:

[0075] S1, the host primary positive socket 16, the host primary negative socket 17, the host secondary positive socket 18 and the host secondary negative socket 19 are connected to the primary side of the transformer through wires, and the slave secondary positive socket 20 and the slave secondary negative socket 21 are connected to the device to be tested connected to the secondary side of the transformer through wires;

[0076] S2, press the host power button 9 and the slave power button 14 to turn on the device, press the local / remote button 10 to switch the device working mode to the remote mode, the wireless communication function is turned on, the host microcontroller sends a device search signal through the host wireless communication module to detect whether the slave 2 is online, and when the slave 2 is searched, the host 1 and the slave 2 establish communication through the wireless communication module;

[0077] S3. Rotate the check / self-check knob 13 to check, the host check button 11 is locked, press the slave check button 15, the slave 2 sends a start check signal to the host 1, the host 1 provides auxiliary current to the primary side of the transformer, the secondary side of the transformer generates a corresponding induced current, the slave ammeter 8 detects the current change, the slave microcontroller obtains the current signal detected by the slave ammeter 8 through the serial port and analyzes and processes it into a polarity check result, the slave 2 polarity check result signal is transmitted to the host 1 through the wireless communication module, and the host display 5 and the slave display 6 display the polarity check result of the device to be checked.

[0078] In step S2, turn on the device, first rotate the check / self-check knob 13 to the self-check position, press the local / remote button 10, switch the working mode to the local mode, press the self-check button 12, and the host microcontroller sends a current detection signal. If there is no short circuit in the primary circuit of the transformer, the host microcontroller determines that the self-check has passed, and the host display screen 5 displays "self-check successful". If there is a short circuit in the primary circuit of the transformer, the host microcontroller determines that the self-check has not passed, and the host display screen 5 displays "self-check failed". When the self-check is successful, the transformer polarity check is performed.

[0079] In local mode, the host primary positive socket 16 and the host primary negative socket 17 are connected to the primary side of the transformer, the host secondary positive socket 18 and the host secondary negative socket 19 are connected to the secondary side of the transformer, the host microcontroller receives the input signal of the host verification button 11, the host primary positive socket 16 and the host primary negative socket 17 apply current assistance to the transformer, the host ammeter 7 obtains the current direction of the secondary side of the transformer through the host secondary positive socket 18 and the host secondary negative socket 19, the host microcontroller obtains the current direction signal of the host ammeter 7 through the serial port, and converts it into a digital signal for internal analysis and processing, and displays the polarity of the transformer on the host display screen 5 according to the analysis and processing result;

[0080] In remote mode, the host microcontroller establishes a connection with the slave through the host LoRa wireless communication antenna 3. The host 1 exchanges polarity check confirmation signals with the slave 2 at a frequency of 20 milliseconds through half-duplex communication, which is implemented 5 times in total. When the polarity check results returned by the slave 2 are consistent for 4 of them, the polarity check result is determined to be valid, otherwise the polarity check is determined to have failed. The check result is displayed on the host display 5 and the slave display 6. The wireless communication between the host 1 and the slave 2 adopts a half-duplex communication mode. Both communicating parties can send and receive information, but at the same time, only one party can send information and the other party can receive information, which effectively prevents false confirmation of information.

[0081] The present invention innovatively uses MOS tubes to replace mechanical switches, solves the problem of mechanical contact burning, can quickly break 20A high current, and the MOS tube has fast response, long life and low energy consumption, which can improve the performance and reliability of the device; the wireless communication between the host and the slave adopts a half-duplex communication mode, both communicating parties can send and receive information, but at the same time, only one party can send information and the other party can receive information, effectively preventing false confirmation of information; the present invention is compact and portable, can be operated by one person with one hand, supports multiple troubleshooting modes and working modes, saves labor costs, and greatly shortens the verification period; the present invention integrates portability, lightweight, integration and intelligence, and the power consumption of the whole machine is controlled within 150 milliwatts, which is suitable for polarity verification of 10KV zero-sequence current transformers. It is used in conjunction with a small current grounding line selection device to reliably ensure the safe and stable operation of the power grid, and can realize the polarity verification of transformers within 200 meters of an open space between primary and secondary equipment and within 50 meters across floors.

[0082] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A method for checking the polarity of a mutual inductor, characterized in that: A device for checking polarity of a mutual inductor is used, comprising a master (1) and a slave (2); The host (1) comprises a host microcontroller, a host wireless communication module, a host power management module, a host button, a host ammeter (7) and a host display screen (5); The slave (2) comprises a slave microcontroller, a slave wireless communication module, a slave power management module, a slave key, a slave current meter (8) and a slave display screen (6); The host microcontroller and the slave microcontroller are used to input, output and analyze the signals; The host wireless communication module and the slave wireless communication module include a host LoRa wireless communication antenna (3) and a slave LoRa wireless communication antenna (4), which are used to realize wireless communication between the host (1) and the slave (2); The host microcontroller is connected to a host microcontroller, a host wireless communication module, a host power management module, a host button, a host ammeter (7) and a host display screen (5) via a serial port, and the slave microcontroller is connected to a slave microcontroller, a slave wireless communication module, a slave power management module, a slave button, a slave ammeter (8) and a slave display screen (6) via a serial port; The host (1) further comprises a host primary positive pole socket (16), a host primary negative pole socket (17), a host secondary positive pole socket (18) and a host secondary negative pole socket (19), wherein the host primary positive pole socket (16) and the host primary negative pole socket (17) are used to connect to the primary side of the mutual inductor, and the host secondary positive pole socket (18) and the host secondary negative pole socket (19) are used to connect to the secondary side of the mutual inductor; The slave (2) further comprises a slave secondary positive electrode socket (20) and a slave secondary negative electrode socket (21), which are used to connect to the secondary side of the mutual inductor; The host microcontroller is connected to a host primary positive electrode socket (16), a host primary negative electrode socket (17), a host secondary positive electrode socket (18) and a host secondary negative electrode socket (19) via a serial port, and the slave microcontroller is connected to a slave secondary positive electrode socket (20) and a slave secondary negative electrode socket (21) via a serial port; The host buttons include a host power button (9), a local / remote button (10), a host check button (11), a self-check button (12) and a check / self-check knob (13), and the slave buttons include a slave power button (14) and a slave check button (15); The local / remote button (10) is used to switch the working mode between the local mode and the remote mode. The host check button (11) and the self-check button (12) are effective in the local mode, and the slave check button (15) is effective in the remote mode. The method for using the above device for transformer polarity verification comprises the following steps: S1, the host primary positive socket (16), the host primary negative socket (17), the host secondary positive socket (18) and the host secondary negative socket (19) are connected to the primary side of the transformer through wires, and the slave secondary positive socket (20) and the slave secondary negative socket (21) are connected to the device to be tested connected to the secondary side of the transformer through wires; S2, pressing the host power button (9) and the slave power button (14) to turn on the device, pressing the local / remote button (10) to switch the device working mode to the remote mode, turning on the wireless communication function, and the host microcontroller sending a device search signal through the host wireless communication module to detect whether the slave (2) is online. When the slave (2) is found, the host (1) and the slave (2) establish communication through the wireless communication module; S3, the check / self-check knob (13) is rotated to the check position, the host check button (11) is locked, the slave check button (15) is pressed, the slave (2) sends a check start signal to the host (1), the host (1) provides auxiliary current to the primary side of the transformer, the secondary side of the transformer generates a corresponding induced current, the slave ammeter (8) detects the current change, the slave microcontroller obtains the current signal detected by the slave ammeter (8) through the serial port and analyzes and processes it as a polarity check result, the slave (2) polarity check result signal is transmitted to the host (1) through the wireless communication module, the host (1) exchanges polarity check confirmation signals with the slave (2) at a frequency of 20 milliseconds through half-duplex communication, and implements it 5 times in total. When the polarity check results returned by the slave (2) are consistent for 4 times, it is determined that the polarity check result is valid, otherwise it is determined that the polarity check fails, and the host display (5) and the slave display (6) display the polarity check result of the device to be checked.

2. A method for transformer polarity verification according to claim 1, characterized in that: The host microcontroller and the slave microcontroller are 90nm low-power microcontroller STM32F103, and the 90nm low-power microcontroller STM32F103 includes: The core control unit is used to receive key input signals, control the coordinated work of other components, process data interaction between the host (1) and the slave (2), and determine the results of the transformer polarity verification; Storage system, used to record the status and results of the verification; SWD debugging interface, used for development and debugging; The clock crystal oscillator is used to support the main frequency operation of the 90nm low-power microcontroller chip STM32F103.

3. A method for transformer polarity verification according to claim 1, characterized in that: The host power management module and the slave power management module include a lithium battery, an inductor, a capacitor, a TX4401 voltage regulator chip, a 4056H charging protection chip and a Type-C interface.

4. A method for transformer polarity verification according to claim 1, characterized in that: The host display screen (5) and the slave display screen (6) are LCD display screens, which are used to display time, battery power, device status, test information and polarity verification results.

5. A method for transformer polarity verification according to claim 1, characterized in that: It also includes a host sound and light indication module and a slave sound and light indication module, which are used to emit a buzzer when the mutual inductor polarity check is successful, and to make the host display screen (5) and the slave display screen (6) flash. The host microcontroller is connected to the host sound and light indication module via a serial port, and the slave microcontroller is connected to the slave sound and light indication module via a serial port.

6. A method for transformer polarity verification according to claim 1, characterized in that: The host button and the slave button are made of MOS tubes.

7. A method for transformer polarity verification according to claim 1, characterized in that: In step S2, the device is turned on, the check / self-check knob (13) is first rotated to the self-check position, and the self-check button (12) is pressed. The host microcontroller sends a current detection signal. If there is no short circuit in the primary circuit of the transformer, the host microcontroller determines that the self-check has passed, and the host display screen (5) displays "self-check success". If there is a short circuit in the primary circuit of the transformer, the host microcontroller determines that the self-check has not passed, and the host display screen (5) displays "self-check failure". When the self-check is successful, the transformer polarity check is then performed.

8. A method for transformer polarity verification according to claim 1, characterized in that: In the local mode, the host primary positive socket (16) and the host primary negative socket (17) are connected to the primary side of the transformer, the host secondary positive socket (18) and the host secondary negative socket (19) are connected to the secondary side of the transformer, the host microcontroller receives the input signal of the host verification button (11), the host primary positive socket (16) and the host primary negative socket (17) apply current assistance to the transformer, the host ammeter (7) obtains the current direction of the secondary side of the transformer through the host secondary positive socket (18) and the host secondary negative socket (19), the host microcontroller obtains the current direction signal of the host ammeter (7) through the serial port, and converts it into a digital signal for internal analysis and processing, and displays the polarity of the transformer on the host display screen (5) according to the analysis and processing result.

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