A method for identifying a fire zero line disconnection of an electric energy meter

Abstract

The application provides a fire zero line connection error identification method for an electric energy meter, and relates to the technical field of electric power metering. The method senses signals through a fire line detection circuit with the fire line as a reference ground and a zero line detection circuit with the zero line as a reference ground; the connection state is determined according to the waveform characteristics of the two signals: when the fire line side outputs a periodic signal and the zero line side outputs a low level, it is determined to be correct, and vice versa, it is determined to be connected incorrectly. The application utilizes the induction antenna cooperating with the base of the electric energy meter, couples the induction signal through the distributed capacitance between the induction antenna and the ground, and adopts a double-path complementary verification mechanism, so that the misjudgment caused by environmental interference is effectively avoided, an additional grounding wire is not needed, and the reliability and accuracy of identification are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of power metering technology, and specifically to a method for identifying incorrect connection of the live and neutral wires in an electricity meter. Background Technology

[0002] As the core device for measuring electricity consumption in a power system, the correctness of the installation and wiring of an electricity meter directly affects electricity safety and metering accuracy. In the actual installation process, reversing the live wire (L) and neutral wire (N) is a relatively common installation error. Although reversing the live and neutral wires will not directly damage most modern electronic electricity meters, it can lead to a series of safety, metering, and management hazards.

[0003] From a safety perspective, when the live and neutral wires are reversed, even if the switch is turned off, the appliance will still carry the voltage of the live wire. This means that when changing light bulbs or repairing appliances, users may mistakenly believe the circuit is broken and touch live parts, leading to electric shock. From a metering perspective, the varying levels of electricity usage and grid management in different regions mean that reversed live and neutral wires can cause inaccurate electricity metering, resulting in economic losses for power companies or users.

[0004] Currently, professional electricity meter installers typically rely on test pens to identify live and neutral wires. However, this method depends on manual operation, and there is still a probability of incorrect wiring during actual installation. Therefore, the electricity meter itself needs to have the ability to detect and identify incorrect live and neutral wire connections.

[0005] The relevant patent documents retrieved are as follows: Chinese patent application CN 211206755 U discloses a live / neutral wire identification system with detection function, comprising a signal conversion unit, a live / neutral wire detection and identification device, and a signal prompt module connected in sequence. The system uses a first antenna and a second antenna inserted into the left and right sockets of a socket respectively to detect the live and neutral wires. An analog-to-digital converter converts the sensed signals into digital signals, and the amplitude and difference between the two signals are compared to determine the wiring status.

[0006] Chinese patent application CN 205427091 U discloses an electricity meter and a live wire detection circuit, including an antenna for sensing periodic live wire signals and an amplification unit for amplifying the detected signals. This solution uses a three-stage NPN transistor amplifier circuit to amplify the signal sensed by the antenna and output it to a microprocessor. The presence or absence of a signal output determines whether the wiring is correct.

[0007] The prior art represented by the aforementioned documents has at least the following unresolved technical problems or defects: First, the system disclosed in Chinese patent application CN 211206755 U is a portable socket testing tool that requires the antenna to be inserted into the socket hole for testing. This solution is not suitable for the built-in testing scenario of electricity meters, and its quantitative comparison method of comparing the amplitude of two signals is easily affected by environmental factors, resulting in insufficient testing stability.

[0008] Second, the solution disclosed in Chinese patent application CN 205427091 U only adopts a single-channel detection method, that is, the detection circuit is only set on the live wire side. Since the inductive signal is easily affected by various factors such as the installation environment and electromagnetic interference, single-channel detection may experience short-term or continuous signal anomalies in some cases, leading to false judgments by the energy meter and limited detection reliability.

[0009] Third, the aforementioned existing technologies all adopt a unified reference ground design, which fails to fully utilize the signal differences between the live wire and the neutral wire relative to their respective reference grounds under the two states of correct and incorrect wiring. This makes it impossible to form an effective complementary verification mechanism, thus limiting the reliability and accuracy of the detection.

[0010] Fourth, the existing technologies mentioned above fail to fully consider the actual usage scenarios of electricity meters installed on utility poles or walls in the design of the signal sensing structure, making it difficult to obtain a stable and sufficient amount of sensing signal. Summary of the Invention

[0011] The purpose of this invention is to provide a method for identifying incorrect live and neutral wire connections in electricity meters. By setting up a live wire detection circuit with the live wire as the reference ground and a neutral wire detection circuit with the neutral wire as the reference ground, and utilizing the dual complementary signal characteristics in conjunction with the distributed capacitance coupling induction of the base, a highly reliable identification of incorrect live and neutral wire connections in electricity meters can be achieved.

[0012] To achieve the above objectives, the present invention provides the following technical solution: A method for identifying incorrect live and neutral wire connections in an electricity meter includes the following steps: S1: The live wire detection circuit senses the signal on the live wire side. The live wire detection circuit takes the live wire as a reference ground. When the live and neutral wires are connected correctly, it generates a periodic signal of the first preset frequency. When the live and neutral wires are connected incorrectly, it outputs a low-level signal. S2: The neutral wire detection circuit senses the neutral wire side signal. The neutral wire detection circuit takes the neutral wire as a reference ground. When the live and neutral wires are connected correctly, it outputs a low-level signal. When the live and neutral wires are connected incorrectly, it generates a periodic signal of a first preset frequency. S3: Obtain the first detection signal output by the live wire detection circuit and the second detection signal output by the neutral wire detection circuit; S4: Determine the wiring status of the live and neutral wires based on the waveform characteristics of the first detection signal and the second detection signal. When the first detection signal is a periodic signal of a first preset frequency and the second detection signal is at a low level, the wiring is determined to be correct. When the second detection signal is a periodic signal of a first preset frequency and the first detection signal is at a low level, the live and neutral wires are determined to be incorrectly connected.

[0013] Furthermore, step S4 also includes: when neither the first detection signal nor the second detection signal satisfies the condition that one of them is a periodic signal of a first preset frequency and the other is at a low level, the detection is determined to be invalid, and the process returns to step S3 to continue detection.

[0014] Furthermore: the first preset frequency is the power frequency.

[0015] Furthermore: both the live wire detection circuit and the neutral wire detection circuit include a signal sensing unit, a signal amplification unit, and a signal transmission unit connected in sequence; the signal sensing unit is used to sense AC signals; the signal amplification unit is used to amplify the sensed AC signals and convert them into digital signals; the signal transmission unit is used to isolate and transmit the digital signals to the energy meter chip.

[0016] Furthermore, the signal sensing unit includes an induction antenna and a voltage divider resistor. One end of the induction antenna is connected to the corresponding live wire or neutral wire through the voltage divider resistor, and the other end of the induction antenna is in contact with the mounting base of the energy meter. The AC signal is induced through the distributed capacitance formed between the mounting base and the ground.

[0017] Furthermore, the inductive antenna is a spring antenna, with one end soldered to the circuit board and the other end elastically contacting the mounting base.

[0018] Furthermore: the signal amplification unit includes a protection diode, a field-effect transistor, and a transistor; the protection diode is used to provide a circuit for the negative half-wave of the induced signal; the gate of the field-effect transistor receives the induced signal and controls its conduction or cutoff according to the amplitude of the induced signal; the base of the transistor is connected to the drain of the field-effect transistor to shape the signal and output a periodic square wave signal or a low-level signal.

[0019] Furthermore, the signal transmission unit uses an optocoupler to achieve electrical isolation.

[0020] Furthermore, it also includes step S5: when it is determined that the live and neutral wires are incorrectly connected, an alarm signal is generated and the incorrect connection event is reported through the communication module.

[0021] Furthermore, it also includes an indicator light alarm step: using the first detection signal and the second detection signal to drive the dual-color indicator light, when the live and neutral wires are connected correctly, the first color light of the dual-color indicator light flashes at a first preset frequency; when the live and neutral wires are connected incorrectly, the second color light of the dual-color indicator light flashes at a first preset frequency.

[0022] Compared with the prior art, the present invention has the following advantages: I. This invention employs a dual-path detection method using a live wire detection circuit and a neutral wire detection circuit. The live wire detection circuit uses the live wire as a reference ground, and the neutral wire detection circuit uses the neutral wire as a reference ground. This ensures that the two detection circuits generate opposite signal characteristics under correct and incorrect wiring conditions, forming a complementary verification mechanism. Compared to existing single-path detection schemes, this invention effectively avoids misjudgments caused by environmental interference, signal anomalies, and other factors, significantly improving the reliability and accuracy of live / neutral wire misconnection identification.

[0023] Second, this invention determines the wiring status by qualitatively judging whether the detection signal is a power frequency periodic signal or a low level, rather than by quantitatively comparing the amplitudes of two signals. This judgment method is insensitive to the absolute magnitude of the signal amplitude, has strong anti-interference capabilities, and its judgment logic is simple and clear, further improving the stability of the detection.

[0024] Third, the signal sensing unit of this invention adopts a structure in which an induction antenna and a power meter mounting base cooperate, utilizing the distributed capacitance formed between the mounting base and the ground to couple and induce AC signals. This design fully considers the actual usage scenario of power meters being installed on utility poles or walls, eliminating the need for additional grounding wires or detection terminals. It features a simple structure, low cost, and the induced signal quantity can be easily optimized by adjusting the resistance value of the voltage divider resistor and the contact area between the induction antenna and the base, making it highly practical.

[0025] Fourth, the signal transmission unit of the present invention uses an optocoupler to achieve electrical isolation, which effectively solves the electrical isolation problem caused by the use of different reference grounds for the live wire detection circuit and the neutral wire detection circuit, and ensures the safety and reliability of the transmission of the detection signal to the energy meter chip.

[0026] Fifth, this invention also provides indicator light alarm and communication reporting functions. When a misconnection of the live and neutral wires is detected, the wiring status can be displayed intuitively on site by flashing different colors of the dual-color indicator light, which makes it easy for installers to quickly identify the wiring situation. The misconnection event can also be reported to a remote terminal through the communication module, which makes it easier for the power management department to grasp and handle wiring abnormalities in a timely manner, thereby improving the intelligent management level of the electricity meter. Attached Figure Description

[0027] Figure 1 This is an overall block diagram of the live and neutral wire misconnection identification method of the present invention; Figure 2 This is a circuit diagram of the live / neutral wire misconnection identification method of the present invention; Figure 3 This is a schematic diagram of the installation status of the energy meter of the present invention; Figure 4 This is a flowchart of the energy meter chip identification logic of the present invention; Figure 5 The waveform of the sensing signal of the signal sensing unit when the live and neutral wires are connected correctly; Figure 6 The output signal waveform of the signal amplification unit when the live and neutral wires are connected correctly; Figure 7 The waveform of the induced signal from the signal sensing unit when the live and neutral wires are incorrectly connected; Figure 8 The output signal waveform of the signal amplification unit when the live and neutral wires are incorrectly connected; In the diagram: 1. Voltage divider resistor; 2. Inductive spring antenna; 3. Mounting base. Detailed Implementation

[0028] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] This invention provides a method for identifying incorrect live and neutral wire connections in electricity meters. This method automatically identifies the connection status of the live and neutral wires by incorporating two sets of detection circuits—a live wire detection circuit and a neutral wire detection circuit—within the electricity meter. The core of this invention lies in the fact that the live wire detection circuit uses the live wire as a reference ground, and the neutral wire detection circuit uses the neutral wire as a reference ground. The two detection circuits generate opposite signal characteristics under correct and incorrect connection conditions. The electricity meter chip comprehensively judges the two signals, thereby reliably identifying the connection status of the live and neutral wires.

[0030] See Figure 1 The overall framework of the live / neutral wire misconnection identification method of the present invention includes two sets of detection circuits. Each set of detection circuits includes a signal sensing unit, a signal amplification unit, and a signal transmission unit connected in sequence. The first detection signal generated by the live wire detection circuit and the second detection signal generated by the neutral wire detection circuit are respectively transmitted to the energy meter chip, which performs logical judgment. At the same time, the two detection signals can also drive the indicator light circuit to achieve intuitive on-site indication.

[0031] See Figure 2 The specific structures of the live wire detection circuit and the neutral wire detection circuit will be explained in detail below.

[0032] The live wire detection circuit includes a signal sensing unit, a signal amplification unit, and a signal transmission unit. The signal sensing unit consists of a sensing spring antenna, a first voltage divider resistor, and a second voltage divider resistor. One end of the sensing spring antenna is soldered to the circuit board, and the other end elastically contacts the mounting base of the energy meter. The first and second voltage divider resistors are connected in series between the sensing spring antenna and the live wire. The signal amplification unit consists of a protection diode, a filter capacitor, a field-effect transistor, a first bias resistor, a second bias resistor, a transistor, and an output resistor. The signal transmission unit consists of a current-limiting resistor, an optocoupler, and an output resistor. It should be noted that the reference ground for both the signal sensing unit and the signal amplification unit is the ground point on the live wire side.

[0033] The structure of the neutral wire detection circuit is the same as that of the live wire detection circuit, also including a signal sensing unit, a signal amplification unit, and a signal transmission unit. The circuit structure and component configuration of each unit are consistent with those of the live wire detection circuit. The difference between the two is that in the neutral wire detection circuit, the voltage divider resistor of the signal sensing unit is connected in series between the sensing spring antenna and the neutral wire, and the reference ground of the signal sensing unit and the signal amplification unit is the grounding point on the neutral wire side.

[0034] The indicator circuit consists of multiple resistors, multiple transistors, and dual-color LEDs, used to receive two detection signals and drive the dual-color LEDs for indication.

[0035] The working principle of the signal sensing unit is explained in detail below. The signal sensing unit is one of the key innovations of this invention. (See also...) Figure 3 In practical use, electricity meters are typically installed on utility poles or walls. One end of the induction spring antenna 2 is connected to the live or neutral wire via a voltage divider resistor 1, while the other end elastically contacts the mounting base 3 of the electricity meter. Due to the distributed capacitance between the mounting base 3 and the ground, a signal coupling loop is formed between the induction spring antenna 2, the voltage divider resistor 1, the mounting base 3, and the ground. When the voltage divider resistor is selected with an appropriate resistance value, and the contact area between the induction spring antenna 2 and the mounting base 3 is chosen reasonably, this signal coupling loop can effectively sense AC signals.

[0036] For a live wire detection circuit, since its reference ground is the live wire, when the live and neutral wires are connected correctly, the live wire has a power frequency AC voltage relative to the ground, and the signal sensing unit can sense a large AC signal. When the live and neutral wires are connected incorrectly, the neutral wire is actually connected where the live wire should be, and the voltage of the neutral wire relative to the ground is very small, so the signal sensing unit senses a very small signal. For a neutral wire detection circuit, since its reference ground is the neutral wire, the logic is exactly the opposite: when the live and neutral wires are connected correctly, the signal sensing unit senses a very small signal; when the live and neutral wires are connected incorrectly, the signal sensing unit can sense a large AC signal.

[0037] The working principle of the signal amplification unit is explained in detail below. The function of the signal amplification unit is to amplify the weak AC signal sensed by the signal sensing unit and convert it into a digital signal recognizable by the energy meter chip. Taking the live wire detection circuit as an example: since the signal sensing unit senses an AC signal, but only the positive half-wave signal is needed in actual detection, a protection diode is set to provide a circuit for the negative half-wave signal, while simultaneously protecting the field-effect transistor from reverse voltage damage. When the live and neutral wires are correctly connected, the signal sensed by the signal sensing unit is relatively large. This signal can drive the field-effect transistor to repeatedly turn on and off at the power frequency. After being shaped by the transistor, a square wave signal at the power frequency is output. When the live and neutral wires are incorrectly connected, the signal sensed by the signal sensing unit is very small, insufficient to drive the field-effect transistor to conduct. The field-effect transistor remains in the off state, the transistor continues to conduct, and the output remains low. Similarly, in the neutral wire detection circuit, since its reference ground is the neutral wire, the logic of the output signal is exactly the opposite: when the live and neutral wires are correctly connected, the output remains low; when the live and neutral wires are incorrectly connected, a square wave signal at the power frequency is output.

[0038] The working principle of the signal transmission unit is explained in detail below. The main function of the signal transmission unit is to achieve electrical isolation. Since the reference ground of the live wire detection circuit is the live wire, and the reference ground of the neutral wire detection circuit is the neutral wire, their reference grounds are different. Therefore, electrical isolation is required before the detection signal can be safely transmitted to the energy meter chip. This invention uses an optocoupler as the isolation device, which has the advantages of high cost-effectiveness and good isolation effect. After isolation by the signal transmission unit, the live wire detection circuit outputs the first detection signal, and the neutral wire detection circuit outputs the second detection signal. The two detection signals are transmitted to the energy meter chip respectively. It should be noted that currently, the reference ground of many energy meter chips is floating on the live wire. In this case, the signal transmission unit of the live wire detection circuit can be omitted to reduce costs.

[0039] The identification logic of the electricity meter chip is explained in detail below. (See also...) Figure 4 After receiving the first and second detection signals, the energy meter chip makes the following judgments: First, it detects the waveform characteristics of the first and second detection signals; then, it determines whether one of the two signals is a periodic signal at the power frequency and the other is at a low level. If so, the detection is considered valid; if not, the detection is considered invalid, and the detection continues. If the detection is valid, it further determines: if the second detection signal is a periodic signal at the power frequency and the first detection signal is at a low level, it is determined that the live and neutral wires are incorrectly connected, and the energy meter chip records the event and reports it through the communication module; if the first detection signal is a periodic signal at the power frequency and the second detection signal is at a low level, it is determined that the wiring is correct.

[0040] This invention employs dual-channel detection, requiring the two signals to meet complementary conditions for a valid detection. This is based on the following considerations: Although theoretically, single-channel detection can also identify live and neutral wires, in practical use, the induced signal is easily affected by various factors such as the installation environment and electromagnetic interference, which may lead to short-term or continuous signal anomalies in certain situations. If only single-channel detection is used, the energy meter may make false judgments. The dual-channel detection method, which only makes a judgment when the two signals exhibit complementary characteristics, effectively avoids false judgments under abnormal conditions and significantly improves the reliability of the detection.

[0041] The working principle of the indicator light alarm circuit is explained in detail below. The indicator light alarm circuit is mainly used to help on-site installers quickly identify whether the wiring is correct after installation. This invention uses hardware control to drive the dual-color LED, which can save pin resources of the electricity meter chip. When the live and neutral wires are connected correctly, the first detection signal is a square wave signal at the power frequency, which drives the green light of the dual-color LED to flash at the power frequency. When the live and neutral wires are incorrectly connected, the second detection signal is a square wave signal at the power frequency, which drives the red light of the dual-color LED to flash at the power frequency. Installers can quickly determine the current wiring status by observing the color of the indicator light. Of course, if the electricity meter chip has sufficient pin resources, the control of the indicator light can also be implemented by the electricity meter chip through software.

[0042] The following are actual test cases of this invention. A test circuit was built according to the above circuit structure, and the live wire detection circuit was used as an example for testing. When the live and neutral wires are connected correctly, the waveform sensed by the signal sensing unit across the second voltage divider resistor is as follows: Figure 5 As shown, this waveform is a power frequency AC signal. After amplification and shaping by the signal amplification unit, the waveform obtained at the collector and emitter of the transistor is as follows. Figure 6 As shown, the waveform is a square wave signal at the power frequency. This square wave signal is then transmitted to the energy meter chip after being isolated by the signal transmission unit.

[0043] When the live and neutral wires are incorrectly connected, the waveform sensed by the signal sensing unit across the second voltage divider resistor is as follows: Figure 7 As shown, at this time, because the signal is too small to drive the field-effect transistor to conduct, the collector and emitter terminals of the transistor remain at a low level. Figure 8 As shown. This low-level signal is then transmitted to the energy meter chip after being isolated by the signal transmission unit.

[0044] Similarly, the output logic of the neutral wire detection circuit is exactly the opposite. When the live and neutral wires are connected correctly, the second detection signal received by the energy meter chip is a low level; when the live and neutral wires are connected incorrectly, the second detection signal received by the energy meter chip is a square wave signal at the power frequency.

[0045] Based on the waveform characteristics of the two detection signals, the energy meter chip can reliably identify the wiring status of the live and neutral wires. When an incorrect connection is detected, the energy meter records the event and can report it to the remote management terminal via various communication methods. At the same time, the red light in the indicator circuit flashes to remind the on-site installers that there is a wiring problem.

[0046] In summary, this invention achieves reliable identification of incorrect live and neutral wire connections in an electricity meter by setting up a live wire detection circuit with the live wire as the reference ground and a neutral wire detection circuit with the neutral wire as the reference ground, utilizing the complementary signal characteristics generated by the two detection circuits under different wiring states. The signal sensing unit of this invention cleverly utilizes an inductive spring antenna in conjunction with the electricity meter mounting base, inducing signals through the distributed capacitance coupling between the base and the ground. This fully incorporates the actual installation scenarios of the electricity meter, resulting in a simple structure, low cost, and strong practicality. The dual-path detection and complementary verification mechanism of this invention effectively improves the reliability of detection and avoids the misjudgment problems that may occur with single-path detection.

[0047] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent transformations or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for identifying incorrect connection of live and neutral wires in an electricity meter, characterized in that, Includes the following steps: S1: The live wire detection circuit senses the signal on the live wire side. The live wire detection circuit takes the live wire as a reference ground. When the live and neutral wires are connected correctly, it generates a periodic signal of the first preset frequency. When the live and neutral wires are connected incorrectly, it outputs a low-level signal. S2: The neutral wire detection circuit senses the neutral wire side signal. The neutral wire detection circuit takes the neutral wire as a reference ground. When the live and neutral wires are connected correctly, it outputs a low-level signal. When the live and neutral wires are connected incorrectly, it generates a periodic signal of a first preset frequency. S3: Obtain the first detection signal output by the live wire detection circuit and the second detection signal output by the neutral wire detection circuit; S4: Determine the wiring status of the live and neutral wires based on the waveform characteristics of the first detection signal and the second detection signal. When the first detection signal is a periodic signal of a first preset frequency and the second detection signal is at a low level, the wiring is determined to be correct. When the second detection signal is a periodic signal of a first preset frequency and the first detection signal is at a low level, the live and neutral wires are determined to be incorrectly connected.

2. The method for identifying incorrect connection of live and neutral wires according to claim 1, characterized in that, Step S4 further includes: when neither the first detection signal nor the second detection signal satisfies the condition that one of them is a periodic signal of a first preset frequency and the other is at a low level, the detection is determined to be invalid, and the process returns to step S3 to continue detection.

3. The method for identifying incorrect connection of live and neutral wires according to claim 1, characterized in that, The first preset frequency is the power frequency.

4. The method for identifying incorrect connection of live and neutral wires according to claim 1, characterized in that, Both the live wire detection circuit and the neutral wire detection circuit include a signal sensing unit, a signal amplification unit, and a signal transmission unit connected in sequence; the signal sensing unit is used to sense AC signals; the signal amplification unit is used to amplify the sensed AC signals and convert them into digital signals; and the signal transmission unit is used to transmit the digital signals to the energy meter chip in isolation.

5. The method for identifying incorrect connection of live and neutral wires according to claim 4, characterized in that, The signal sensing unit includes an induction antenna and a voltage divider resistor. One end of the induction antenna is connected to the corresponding live wire or neutral wire through the voltage divider resistor, and the other end of the induction antenna is in contact with the mounting base of the energy meter. The AC signal is induced through the distributed capacitance formed between the mounting base and the ground.

6. The method for identifying incorrect connection of live and neutral wires according to claim 5, characterized in that, The inductive antenna is a spring antenna, with one end soldered to the circuit board and the other end elastically touching the mounting base.

7. The method for identifying incorrect connection of live and neutral wires according to claim 4, characterized in that, The signal amplification unit includes a protection diode, a field-effect transistor, and a transistor; the protection diode is used to provide a circuit for the negative half-wave of the induced signal; the gate of the field-effect transistor receives the induced signal and controls its conduction or cutoff according to the amplitude of the induced signal; the base of the transistor is connected to the drain of the field-effect transistor to shape the signal and output a periodic square wave signal or a low-level signal.

8. The method for identifying incorrect connection of live and neutral wires according to claim 4, characterized in that, The signal transmission unit uses an optical coupler to achieve electrical isolation.

9. The method for identifying incorrect connection of live and neutral wires according to claim 1, characterized in that, It also includes step S5: when it is determined that the live and neutral wires are incorrectly connected, an alarm signal is generated and the incorrect connection event is reported through the communication module.

10. The method for identifying incorrect connection of live and neutral wires according to claim 1, characterized in that, It also includes an indicator light alarm step: using the first detection signal and the second detection signal to drive the dual-color indicator light, when the live and neutral wires are connected correctly, the first color light of the dual-color indicator light flashes at a first preset frequency; when the live and neutral wires are connected incorrectly, the second color light of the dual-color indicator light flashes at a first preset frequency.

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