Load electrical fire safety protection device for distribution network

Abstract

The present invention provides a load electrical fire safety protection device for a distribution network, comprising: a first current transformer, configured to be mounted on a phase line of a distribution line, the first current transformer being used to collect a first current signal of the distribution line; an arc signal processing module, configured to be connected to the first current transformer, the arc signal processing module being used to perform signal processing on the first current signal to obtain a second current signal; a metering module, configured to be connected to the first current transformer, the metering module being used to generate a current metering signal based on the first current signal; a microcontroller, configured to be respectively connected to the arc signal processing module and the metering module, the microcontroller being used to perform state detection on the second current signal based on the current metering signal; a switch module, configured to be set on the phase line of the distribution line, the switch module being used to switch to an off state in response to a first drive signal to cut off the electrical connection between the load and the distribution network.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic equipment for power systems, and more specifically, to a load electrical fire safety protection device for a power distribution network. Background Art

[0002] Distribution lines refer to power grids that receive electric energy from transmission grids or regional power plants and distribute it locally or step by step according to voltage to various users through distribution facilities. Distribution networks have the characteristics of multiple voltage levels, complex network structures, diverse equipment types, multiple and wide operating points, and relatively poor safety environments. Therefore, there are relatively more safety risk factors in distribution networks. In addition, since the function of distribution networks is to provide electric energy to various users, this places higher requirements on the safe and reliable operation of distribution networks.

[0003] The switchgear is an important component of the power system, which can control and protect the power equipment and ensure its safe operation. The more important functions of the switchgear in the power system include providing fast and effective arc fault protection to achieve its fire protection, electric shock protection and other functions. In the related art, the realization of the arc fault protection function generally requires the configuration of additional hardware facilities in the switchgear, which leads to an increase in the hardware cost of the switchgear, which is not conducive to the popularization and development of the switchgear. Summary of the invention

[0004] In view of this, the present invention provides a load electrical fire safety protection device for a power distribution network, comprising: a first current transformer, an arc signal processing module, a metering module, a microcontroller and a switch module.

[0005] The first current transformer is configured to be mounted on a phase line of a power distribution line, and is used to collect a first current signal of the power distribution line.

[0006] The arc signal processing module is configured to be connected to the first current transformer, and the arc signal processing module is used to perform signal processing on the first current signal to obtain a second current signal.

[0007] The metering module is configured to be connected to the first current transformer, and is used to generate a current metering signal based on the first current signal.

[0008] The microcontroller is configured to be connected to the arc signal processing module and the metering module respectively. The microcontroller is used to perform state detection on the second current signal based on the current metering signal, and generate a first drive signal through the drive circuit when it is determined that the second current signal is an arc signal.

[0009] The switch module is configured to be arranged on a phase line of a power distribution line, and the switch module is used to switch to an off state in response to a first driving signal.

[0010] According to an embodiment of the present invention, the second current signal includes a first sub-signal and a second sub-signal. The arc signal processing module includes a first filter, a first signal amplifier, a second filter, and a second signal amplifier.

[0011] The first filter is used to perform low-pass filtering on the first current signal to obtain a first filtered signal. The first signal amplifier is used to perform signal amplification on the first filtered signal to obtain a first sub-signal. The second filter is used to perform high-pass filtering on the first current signal to obtain a second filtered signal, and the second signal amplifier is used to perform signal amplification on the second filtered signal to obtain a second sub-signal.

[0012] According to an embodiment of the present invention, the switch module includes a solid-state switch and an energy absorption unit. The solid-state switch is configured to be connected in series with a phase line of a power distribution line, and the solid-state switch is used to disconnect in response to a first drive signal so that the switch module is switched to an off state. The energy absorption unit is configured to be connected in parallel with the solid-state switch, and the energy absorption unit is used to absorb a peak overvoltage, which is generated when the solid-state switch performs a switching action.

[0013] According to an embodiment of the present invention, the solid-state switch is composed of transistors connected in anti-series.

[0014] According to an embodiment of the present invention, the above-mentioned load electrical fire safety protection device for a distribution network also includes: a second current transformer, which is configured to be mounted on the phase line and the neutral line of the distribution line, and the second current transformer is used to detect the current difference between the phase line and the neutral line to obtain a third current signal; and a leakage signal processing module, which is configured to be connected to the second current transformer, and the leakage signal processing module is used to perform signal processing on the third current signal to obtain a fourth current signal.

[0015] According to an embodiment of the present invention, the microcontroller is further configured to generate a second drive signal through the drive circuit when the fourth current signal is greater than the current threshold, and the switch module is further configured to switch to an off state in response to the second drive signal.

[0016] According to an embodiment of the present invention, the solid-state switch is further configured to be disconnected in response to the second driving signal, so that the switch module is switched to an off state.

[0017] According to an embodiment of the present invention, the switch module further comprises a relay, which is configured to be connected in series to a phase line of the power distribution line, and the relay is used to disconnect in response to the second drive signal so that the switch module is switched to an off state.

[0018] According to an embodiment of the present invention, the above-mentioned load electrical fire safety protection device for the distribution network also includes: a voltage measuring module, the two measuring ends of the voltage measuring module are configured to respectively connect the phase line and the neutral line of the distribution line, and the voltage measuring module is used to measure the voltage between the phase line and the neutral line to obtain a voltage signal.

[0019] According to an embodiment of the present invention, the microcontroller is further configured to perform state detection on the second current signal based on the current metering signal and the voltage signal to determine whether the second current signal is an arc signal.

[0020] According to an embodiment of the present invention, a current transformer for metering purposes may generally be configured in the load electrical fire safety protection device. By performing signal processing on a first current signal collected by the current transformer to obtain a second current signal for arc signal detection, the arc signal detection function of the current transformer for metering purposes can be reused. Thus, with the addition of a small amount of hardware devices, the load electrical fire safety protection device can realize the function of arc signal detection, thereby effectively saving hardware costs and increasing the safety and reliability of the load electrical fire safety protection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0022] Figure 1 A schematic diagram of a load electrical fire safety protection device for a power distribution network according to an embodiment of the present invention is schematically shown.

[0023] Figure 2 The schematic diagram of the arc signal processing module according to the embodiment of the present invention is schematically shown.

[0024] Figure 3 The schematic diagram of the switch module according to the embodiment of the present invention is schematically shown.

[0025] Figure 4 A schematic diagram of a load electrical fire safety protection device for a power distribution network according to another embodiment of the present invention is schematically shown.

[0026] Figure 5 The diagram schematically shows a switch module according to another embodiment of the present invention.

[0027] Figure 6 The structure of a load electrical fire safety protection device for a power distribution network according to another embodiment of the present invention is schematically shown. DETAILED DESCRIPTION

[0028] Below, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of concepts of the present invention.

[0029] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0030] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0031] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0032] At present, switchgear with arc fault protection function requires high-standard hardware facilities, including high-frequency current transformers and high-performance processors. In the related arc detection technology, the extraction of arc characteristics has high hardware requirements, requiring current transformers with high frequency response bandwidth to realize arc signal acquisition, and high-performance processors to meet arc characteristic detection, which leads to increased product costs and increased technical difficulty.

[0033] In response to the above technical problems, the present invention proposes a load electrical fire safety protection device for a distribution network, which obtains arc characteristics based on the existing current transformer used for metering to achieve arc fault detection and protection. There is no need to add a high-performance processor and a current transformer with a high frequency response bandwidth, and the electrical fire safety protection function can be achieved on the user side of the distribution line at a relatively low cost.

[0034] Figure 1 A schematic diagram of a load electrical fire safety protection device for a power distribution network according to an embodiment of the present invention is schematically shown.

[0035] like Figure 1 As shown, the distribution network can supply power to the load on the user side through the distribution line, and the distribution line can be equipped with a load electrical fire safety protection device, which can include a first current transformer 10, an arc signal processing module 20, a metering module 30, a microcontroller 40 and a switch module 50. The distribution network can supply power to the load 60 through the switch module 50 on the distribution line.

[0036] The first current transformer 10 may be configured to be mounted on a phase line L of a power distribution line. The phase line L may be a line of any phase in the three-phase line of the power distribution line. The first current transformer 10 may be used to collect a first current signal I1 of the power distribution line.

[0037] The arc signal processing module 20 can be configured to be connected to the first current transformer 10, and the arc signal processing module 20 is used to perform signal processing on the first current signal I1 to obtain the second current signal I2. The arc signal processing module can filter the first current signal, and extract features related to arc signal detection, such as the amplitude, waveform slope, frequency, etc. of the current signal, and amplify the extracted features to obtain a second current signal that can be used for arc signal detection.

[0038] The metering module 30 can be configured to be connected to the first current transformer 10, and the metering module 30 is used to generate a current metering signal Ij based on the first current signal I1. The metering module can measure the current amplitude fluctuation of the electrical appliance in real time through a built-in chip based on the first current signal, and the current amplitude fluctuation can be recorded as a current metering signal. Optionally, the metering module can also be configured with a display screen, through which the fluctuation of the current amplitude can be visually displayed.

[0039] The microcontroller 40 may be configured to be connected to the arc signal processing module 20 and the metering module 30, respectively. The microcontroller is used to perform state detection on the second current signal I2 based on the current metering signal Ij. The obtained state detection result may include that the second current signal I2 contains an arc signal, and that the second current signal I2 does not contain an arc signal. When it is determined that the second current signal I2 is an arc signal, the microcontroller 40 may generate a first drive signal Vq through the drive circuit 70. For example, the microcontroller 40 may send an enable signal to the drive circuit 70, and the drive circuit 70 may generate a first drive signal Vq in response to the enable signal. The drive circuit 70 may be various active or passive drive circuits, which are not limited here.

[0040] The method for determining whether the second current signal I2 is an arc signal is not limited here. For example, the microcontroller can convert the second current signal and the current measurement signal into the frequency domain by Fourier transform, wavelet transform, etc., and compare the frequency domain characteristics of the two respectively to determine whether the second current signal is an arc signal.

[0041] Optionally, a processing chip may be configured inside the microcontroller 40, and an arc signal detection model may be configured in the processing chip. The arc signal detection model can determine whether the acquired second current signal is an arc signal based on the acquired second current signal.

[0042] The switch module 50 can be configured to be arranged on the phase line L of the distribution line. Specifically, the switch module 50 can be connected in series on the phase line L. The switch module 50 can be used to switch to the off state in response to the first drive signal Vq to cut off the electrical connection between the load 60 and the distribution network. The switch module 50 can at least include a switch device, which can be connected in series on the phase line L. The switch device can be a circuit breaker, a switch based on a transistor device, a relay, etc., which are not limited here. Optionally, by controlling the opening and closing of the switch module 50, it can also be used to realize other functions of the distribution network. For example, by controlling the opening and closing of the switch modules on multiple distribution lines, the connection and disconnection of the loads on the multiple distribution lines can be controlled, thereby achieving load balancing of the distribution network.

[0043] According to an embodiment of the present invention, a current transformer for metering purposes may generally be configured in the load electrical fire safety protection device. By performing signal processing on a first current signal collected by the current transformer to obtain a second current signal for arc signal detection, the arc signal detection function of the current transformer for metering purposes can be reused. Thus, with the addition of a small amount of hardware devices, the load electrical fire safety protection device can realize the function of arc signal detection, thereby effectively saving hardware costs and increasing the safety and reliability of the load electrical fire safety protection device.

[0044] Figure 2 The schematic diagram of the arc signal processing module according to the embodiment of the present invention is schematically shown.

[0045] like Figure 2 As shown, the arc signal processing module 20 may include a first filter 21 , a first signal amplifier 22 , a second filter 23 and a second signal amplifier 24 .

[0046] The first filter 21 may be a low-pass filter, and the first filter 21 may be used to perform low-pass filtering on the first current signal I1 to obtain a first filtered signal. The first signal amplifier 22 may be used to perform signal amplification on the first filtered signal to obtain a first sub-signal.

[0047] The second filter 23 may be a high-pass filter, and the second filter 23 may be used to perform high-pass filtering on the first current signal I1 to obtain a second filtered signal. The second signal amplifier 24 may be used to perform signal amplification on the second filtered signal to obtain a second sub-signal.

[0048] The second current signal I2 may be composed of a first sub-signal and a second sub-signal.

[0049] The first signal amplifier 22 and the second signal amplifier 24 can be operational amplifiers of any type, or can be expressed as a signal amplification topology structure based on operational amplifiers, which is not limited here.

[0050] According to an embodiment of the present invention, the first current signal passes through the first filter 21 and the second filter 23 respectively to obtain a low-frequency signal part and a high-frequency signal part of the first current signal. The first filtered signal represents the low-frequency signal part of the first current signal, and the second filtered signal represents the high-frequency signal part of the first current signal. The low-frequency signal part can provide information for overcurrent protection and arc signal detection, and the high-frequency signal part can provide additional information for arc signal detection. By amplifying the information provided by the low-frequency signal part and the information provided by the high-frequency signal part, respectively, a current signal that can support arc signal detection, i.e., the second current signal, can be obtained.

[0051] Figure 3 The schematic diagram of the switch module according to the embodiment of the present invention is schematically shown.

[0052] like Figure 3 As shown, the switch module 50 may include a solid-state switch 51 and an energy absorption unit 52 .

[0053] The solid-state switch 51 can be configured to be connected in series to the phase line L of the power distribution line, and the solid-state switch 51 can be used to disconnect in response to the first drive signal Vq, so that the switch module 50 is switched to the off state. The energy absorption unit 52 is configured to be connected in parallel with the solid-state switch 51, and the energy absorption unit is used to absorb the peak overvoltage, which can be generated when the solid-state switch 51 performs a switching action.

[0054] The solid-state switch 51 may be composed of one or more transistors connected. The transistor may include a triode, a field effect transistor, etc., which is not limited here. The connection method of the one or more transistors is not limited here. For example, the one or more transistors may be connected in series to form a solid-state switch, or the one or more transistors may be connected in parallel to form a solid-state switch. Preferably, the solid-state switch may be formed by connecting two or more transistors in reverse series.

[0055] The energy absorption unit 52 may include an overvoltage suppression circuit, which may include components such as a Zener diode, a buffer capacitor, and a varistor to reduce the peak overvoltage generated when the solid-state switch operates to shut off the current.

[0056] According to an embodiment of the present invention, the solid-state switch in the switch module can be used for rapid response and shutdown during an arc fault, and the energy absorption unit can be used during an arc fault to reduce the peak overvoltage generated in the circuit, thereby increasing the reliability of the load electrical fire safety protection device and effectively ensuring the safety of the load equipment.

[0057] Optionally, the load electrical fire safety protection device may also be configured with other hardware facilities to achieve other functions in addition to arc fault protection. For example, the other functions may include leakage protection function.

[0058] Figure 4 A schematic diagram of a load electrical fire safety protection device for a power distribution network according to another embodiment of the present invention is schematically shown.

[0059] like Figure 4 As shown, the load electrical fire safety protection device may further include: a second current transformer 80 and a leakage signal processing module 90 .

[0060] The second current transformer 80 may be configured to be mounted on the phase line L and the neutral line N of the power distribution line. The second current transformer 80 is used to detect the current difference between the phase line L and the neutral line N to obtain the third current signal I3.

[0061] The leakage signal processing module 90 may be configured to be connected to the second current transformer 80 . The leakage signal processing module 90 is used to perform signal processing on the third current signal I3 to obtain a fourth current signal I4 .

[0062] When there is no leakage, according to the law of conservation of charge, the current difference between the phase line and the neutral line detected by the second current transformer 80 is zero, or a smaller current value, and when leakage occurs, the second current transformer 80 can detect a larger current value, and when a larger current value is detected, it can be indicated that leakage has occurred in the electrical appliance between the phase line and the neutral line. For example, when an electrical appliance with a rated current of 1A is working normally, the current difference between the phase line and the neutral line of the power distribution line that supplies power to it can be 0, or a smaller current value, such as 1mA, 5mA, etc. When leakage occurs in the electrical appliance, the current difference between the phase line and the neutral line can be larger, such as 0.5A, etc. Therefore, a current threshold can be set and the collected current value can be compared with the current threshold to determine whether leakage has occurred.

[0063] Optionally, the leakage signal processing module 90 can be composed of a low-pass filter and a signal amplifier. The leakage signal collected by the second current transformer 80 is processed by a low-pass filter, and then amplified by a signal amplifier to obtain a fourth current signal. The digital-to-analog converter inside the microcontroller 40 can perform analog-to-digital conversion on the fourth current signal, and compare the converted electrical signal with the current threshold. When it is determined that the converted electrical signal is greater than the current threshold, a second drive signal Vx can be generated by the drive circuit 70, and the second drive signal Vx can be sent to the switch module 50. The switch module 50 can switch to the off state in response to the second drive signal, thereby realizing the leakage protection function.

[0064] Optionally, the solid-state switch in the switch module 50 may be disconnected in response to the second drive signal, so that the switch module is switched to an off state.

[0065] Alternatively, as another optional implementation, the switch module 50 may include other switch devices, which may also be connected in series to the phase line. The other switch devices may be disconnected in response to the second drive signal, so that the switch module is switched to the off state.

[0066] Optionally, the other switching device may be a relay.

[0067] Figure 5 The diagram schematically shows a switch module according to another embodiment of the present invention.

[0068] like Figure 5 As shown, the switch module 50 may further include a relay 53 .

[0069] The relay 53 may be configured to be connected in series to the phase line L of the power distribution line. For example, the relay may be connected in series to the phase line L of the power distribution line via a normally closed contact of the relay.

[0070] The relay 53 can be used to disconnect in response to the second drive signal Vx so that the switch module is switched to the off state. For example, after the relay receives the second drive signal, the state of the relay can be switched to the normally open contact being on and the normally closed contact being off, and when the relay is configured, the normally open contact can be in a suspended state and the normally closed contact is directly connected to the phase line, so that the switch module can be switched to the off state.

[0071] Relays can be solid-state relays, electromagnetic relays, etc. Relays are often used in automation control circuits and play the role of automatic adjustment, safety protection, and circuit conversion in the circuit.

[0072] According to an embodiment of the present invention, by connecting a solid-state switch and a relay in series, double protection of the power circuit can be achieved to improve the protection performance of the load electrical fire safety protection device.

[0073] Figure 6 The structure of a load electrical fire safety protection device for a power distribution network according to another embodiment of the present invention is schematically shown.

[0074] like Figure 6 As shown, the load electrical fire safety protection device can also include a voltage measuring module 100. The two measuring ends of the voltage measuring module 100 can be configured to respectively connect the phase line L and the neutral line N of the distribution line. The voltage measuring module 100 can be used to measure the voltage between the phase line L and the neutral line N to obtain a voltage signal.

[0075] A part of the voltage signal output by the voltage measurement module 100 can be used to implement overvoltage protection or undervoltage protection, and the other part can be input into the metering module for metering. When the voltage measurement module 100 is used to implement the overvoltage protection function or the undervoltage protection function, the microcontroller 40 can obtain the voltage signal collected by the voltage measurement module 100, and compare the overvoltage protection threshold and the undervoltage protection threshold with the voltage value represented by the voltage signal. When it is determined that the voltage value represented by the voltage signal is greater than the overvoltage protection threshold, it can be determined that the comparison result represents a line abnormality; when it is determined that the voltage value represented by the voltage signal is less than the undervoltage protection threshold, it can be determined that the comparison result represents a line abnormality. When the line is determined to be abnormal, the microcontroller 40 can control the switch module 50 to switch to the shutdown device through the driving circuit 70 to achieve overvoltage protection and undervoltage protection.

[0076] According to an embodiment of the present invention, by setting up a voltage measurement module, the circuit voltage is measured in real time, and overvoltage or undervoltage is avoided, and the power is cut off in time, thereby improving the reliability and safety of the load electrical fire safety protection device, thereby improving the safety of the load in the distribution line.

[0077] According to an embodiment of the present invention, the microcontroller may also be used to perform state detection on the second current signal based on the current metering signal and the voltage signal to determine whether the second current signal is an arc signal.

[0078] According to an embodiment of the present invention, the microcontroller can monitor the amplitude fluctuation range, waveform slope and other parameters of the second current signal in real time through the current metering signal and the voltage signal, and respond promptly when an arc signal is generated, thereby further improving the efficiency and safety of arc signal detection.

[0079] It will be appreciated by those skilled in the art that the features described in the various embodiments of the present invention may be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in the present invention. In particular, without departing from the spirit and teachings of the present invention, the features described in the various embodiments of the present invention may be combined and / or combined in various ways. All of these combinations and / or combinations fall within the scope of the present invention.

[0080] The embodiments of the present invention are described above. However, these embodiments are only for the purpose of illustration, and are not intended to limit the scope of the present invention. Although each embodiment is described above, it does not mean that the measures in each embodiment cannot be used in combination advantageously. Without departing from the scope of the present invention, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A load electrical fire safety protection device for a distribution network, characterized in that: The device comprises: A first current transformer is configured to be sleeved on a phase line of a power distribution line, and the first current transformer is used to collect a first current signal of the power distribution line; an arc signal processing module, configured to be connected to the first current transformer, and the arc signal processing module is used to perform signal processing on the first current signal to obtain a second current signal; a metering module, configured to be connected to the first current transformer, and the metering module is used to generate a current metering signal based on the first current signal; a microcontroller, configured to be connected to the arc signal processing module and the metering module respectively, the microcontroller being used to perform state detection on the second current signal based on the current metering signal, and generating a first drive signal through a drive circuit when determining that the second current signal is an arc signal; and a switch module, configured to be arranged on a phase line of the power distribution line, the switch module being used to switch to an off state in response to the first drive signal to cut off the electrical connection between the load and the power distribution network; The microcontroller is used to convert the second current signal and the current measurement signal into the frequency domain respectively, and compare the frequency domain characteristics of the second current signal in the frequency domain with the frequency domain characteristics of the current measurement signal in the frequency domain to obtain a comparison result, and based on the comparison result, determine whether the second current signal is an arc signal.

2. The device according to claim 1, characterized in that The second current signal includes a first sub-signal and a second sub-signal; Wherein, the arc signal processing module includes a first filter, a first signal amplifier, a second filter and a second signal amplifier; Wherein, the first filter is used to perform low-pass filtering on the first current signal to obtain a first filtered signal; The first signal amplifier is used to perform signal amplification processing on the first filtered signal to obtain the first sub-signal; The second filter is used to perform high-pass filtering on the first current signal to obtain a second filtered signal; and The second signal amplifier is used to perform signal amplification processing on the second filtered signal to obtain the second sub-signal.

3. The device according to claim 1, characterized in that The switch module includes a solid-state switch and an energy absorption unit; Wherein, the solid-state switch is configured to be connected in series to the phase line of the power distribution line, and the solid-state switch is used to disconnect in response to the first drive signal so that the switch module is switched to the off state; The energy absorption unit is configured to be connected in parallel with the solid-state switch, and the energy absorption unit is used to absorb a peak overvoltage, which is generated when the solid-state switch performs a switching action.

4. The device according to claim 3, characterized in that The solid-state switch is composed of transistors connected in reverse series.

5. The device according to claim 3, characterized in that The device also includes: A second current transformer is configured to be mounted on a phase line and a neutral line of the power distribution line, and the second current transformer is used to detect a current difference between the phase line and the neutral line to obtain a third current signal; and The leakage signal processing module is configured to be connected to the second current transformer, and the leakage signal processing module is used to perform signal processing on the third current signal to obtain a fourth current signal.

6. The device according to claim 5, characterized in that The microcontroller is further configured to generate a second drive signal through the drive circuit when the fourth current signal is greater than a current threshold; and The switch module is further configured to switch to an off state in response to the second driving signal.

7. The device according to claim 6, characterized in that The solid-state switch is further configured to be disconnected in response to the second driving signal, so that the switch module is switched to an off state.

8. The device according to claim 6, characterized in that The switch module further includes a relay, which is configured to be connected in series to a phase line of the power distribution line, and the relay is used to be disconnected in response to the second drive signal so as to switch the switch module to an off state.

9. The device according to claim 1, characterized in that The device also includes: A voltage measuring module, wherein two measuring ends of the voltage measuring module are configured to be respectively connected to a phase line and a neutral line of the power distribution line, and the voltage measuring module is used to measure the voltage between the phase line and the neutral line to obtain a voltage signal.

10. The device according to claim 9, characterized in that The microcontroller is further configured to perform state detection on the second current signal based on the current metering signal and the voltage signal to determine whether the second current signal is an arc signal.

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