WO2021196399A1

WO2021196399A1 - Protective device and power distribution box having protective device

Info

Publication number: WO2021196399A1
Application number: PCT/CN2020/094497
Authority: WO
Inventors: 詹逸郎; 项明诚
Original assignee: 深圳市三巨电机有限公司; 三巨科技电机（深圳）有限公司; 项明诚
Priority date: 2020-03-30
Filing date: 2020-06-05
Publication date: 2021-10-07
Also published as: CN111478204A

Abstract

A protective device (300) and a power distribution box having the protective device (300). The protective device (300) comprises: a signal detection circuit (310) for detecting a first voltage between a common ground connection point and a local ground wire starting point (210), a second voltage between the common ground connection point and a local ground wire ending point (220), and a third voltage between the local ground wire starting point (210) and the local ground wire ending point (220); and a controller (320) electrically connected to the signal detection circuit (310) and a leakage protection circuit (100) respectively, wherein when any one of a ratio of a first difference value to a mean value of the first voltages obtained by detection within a preset time period before a current moment, a ratio of a second difference value to a mean value of the second voltages obtained by detection within a preset time period before the current moment, and a ratio of a third difference value to a mean value of the third voltages obtained by detection within a preset time period before the current moment is greater than a preset ratio threshold, the controller (320) outputs a trigger signal to the leakage protection circuit (100), so as to trigger the leakage protection circuit (100) to be disconnected.

Description

Protection device and distribution box with the protection device

Technical field

The present invention relates to the field of power protection, in particular to a protection device and a distribution box with the protection device.

Background technique

Commonly used protection devices for electrical equipment include overcurrent protectors, leakage protectors, etc. Among them, overcurrent protectors are used to limit current to prevent wires in electrical equipment from overloading and generate heat and burn, and leakage protectors are used to detect leakage to protect user. However, the above-mentioned current limiting and leakage detection strategies only play a certain protective role.

Summary of the invention

In view of the foregoing technical problems, embodiments of the present invention provide a protection device and a distribution box with the protection device.

The first aspect of the embodiments of the present invention provides a protection device for a distribution box, the distribution box includes a leakage protection circuit and a local ground wire, the leakage protection circuit is used to connect to the live and neutral wires of the mains , To access the power source, the local ground wire and the public ground wire are connected in series; the protection device includes:

A signal detection circuit for detecting the first voltage between the common ground contact and the start point of the local ground, the second voltage between the common ground contact and the end point of the local ground, and the ground start point and the The third voltage between the end points of the local ground; and

A controller, electrically connected to the signal detection circuit and the leakage protection circuit, respectively;

The ratio of the first difference to the average value of the first voltage detected within a preset time period before the current moment, and the ratio of the second difference to the average value of the second voltage detected within the preset time period before the current moment When any one of the third difference value and the average value of the third voltage detected in the preset time period before the current moment is greater than the preset ratio threshold, the controller outputs a trigger signal to the leakage protection circuit to Trigger the leakage protection circuit to disconnect;

Wherein, the first difference is the difference between the first voltage detected at the current moment and the average value of the first voltage detected within a preset time period before the current moment;

The second difference is the difference between the second voltage detected at the current moment and the average value of the second voltage detected within a preset time period before the current moment;

The third difference is the difference between the third voltage detected at the current moment and the average value of the third voltage detected within a preset time period before the current moment.

Optionally, the signal detection circuit includes at least three comparators;

The non-inverting input terminal of one of the at least three comparators is used to connect the common ground point and one of the starting point of the local ground, and the inverting input terminal is used to connect the common ground point and the The other one of the starting points of the local ground wire;

The non-inverting input terminal of one of the at least three comparators is used to connect the common ground point and one of the local ground terminal, and the inverting input terminal is used to connect the common ground point and the The other one of the end points of the local ground wire;

In addition, the non-inverting input terminal of one of the at least three comparators is used to connect one of the local ground line start point and the local ground line end point, and the inverting input terminal is used to connect the local ground line start point And the other one of the end points of the local ground.

Optionally, the number of the comparators is 6, including a first comparator, a second comparator, a third comparator, a fourth comparator, a fifth comparator, and a sixth comparator;

Wherein, the non-inverting input terminal of the first comparator is used to connect to the common ground point, and the inverting input terminal is used to connect to the start point of the local ground;

The non-inverting input terminal of the second comparator is used to connect to the common ground point, and the inverting input terminal is used to connect to the local ground terminal;

The non-inverting input terminal of the third comparator is used to connect to the start of the local ground, and the inverting input terminal is used to connect to the end of the local ground;

The non-inverting input terminal of the fourth comparator is used to connect to the start of the local ground, and the inverting input terminal is used to connect to the common ground point;

The non-inverting input terminal of the fifth comparator is used to connect to the local ground terminal, and the inverting input terminal is used to connect to the common ground point;

The non-inverting input terminal of the sixth comparator is used to connect to the end of the local ground, and the inverting input terminal is used to connect to the start of the local ground.

Optionally, the controller includes a single-chip microcomputer.

Optionally, the protection device further includes a test button, which is electrically connected between the start point of the local ground wire and the end point of the local ground wire to disconnect or connect the start point of the local ground wire and the local ground wire. The electrical connection of the end point;

When the test button is disconnected, the electrical connection between the start point of the local ground wire and the end point of the local ground wire is disconnected, and the controller is used to obtain the state of the leakage protection circuit to determine whether the leakage protection circuit is Conduction.

Optionally, the protection device further includes a load, and the ground wire of the load is connected in series with the start point of the local ground wire or the end point of the local ground wire.

A second aspect of the embodiments of the present invention provides a power distribution box, the power distribution box including:

Leakage protection circuit, used to connect the live and neutral wires of the mains power supply to connect to the power source;

The local ground wire is connected in series with the public ground wire; and

The protection device described in the first aspect of the embodiment of the present invention.

Optionally, the common ground wire and the local ground wire are connected in series through a water immersion non-contact protector.

Optionally, the leakage protection circuit includes a leakage protector and a leakage switch connected in series, the leakage protector is used to access the live and neutral wires of the mains, and the leakage protection switch is connected to the controller of the protection device. connect.

Optionally, the leakage switch is a leakage air switch.

In the technical solution provided by the embodiment of the present invention, the first voltage between the common ground contact and the start of the local ground, the second voltage between the common ground contact and the end of the local ground, and the local ground are monitored in real time through a signal detection circuit The third voltage between the start point and the end point of the local ground wire, when the controller controls the leakage protection circuit to turn off when any one of the first voltage, the second voltage and the third voltage changes greatly, the power supply is cut off and the power consumption is more ensured. Safety.

Description of the drawings

Fig. 1 is a schematic structural diagram of a protection device in an embodiment of the present invention;

2 is a schematic diagram of the structure of a distribution box in an embodiment of the present invention;

Figure 3 is a schematic circuit diagram of a protection device in an embodiment of the present invention;

4A is a schematic diagram of correct wiring of the load of the protection device in an embodiment of the present invention;

Figure 4B is a schematic diagram of a wrong load wiring of the protection device;

Figure 4C is a schematic diagram of another wrong load wiring of the protection device.

Reference signs:

100: leakage protection circuit; 110: leakage protector; 120: leakage switch;

200: local ground wire; 210: local ground wire start point; 220: local ground wire end point;

300: protection device; 310: signal detection circuit; 311: comparator; R1: first resistor; R2: second resistor; 320: controller; 330: test button; 340: load;

400: Water immersion non-touch protector.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of the present invention.

It should be noted that, if there is no conflict, the following embodiments can be combined.

Fig. 1 is a schematic structural diagram of a protection device in an embodiment of the present invention, and Fig. 2 is a schematic structural diagram of a distribution box in an embodiment of the present invention. The protection device of the embodiment of the present invention can be used in a power distribution box, and can also be used in other power distribution devices.

1 and 2, the distribution box of the embodiment of the present invention may include a leakage protection circuit 100 and a local ground 200, where the leakage protection circuit 100 is used to connect to the live and neutral wires of the mains to connect to the power source. , Supply power to the distribution box. In this embodiment, the local ground 200 is connected in series with the public ground. It should be noted that the public ground wire refers to the ground wire introduced by the power company, and the local ground wire 200 refers to the additional ground wire in the distribution box. The local wire is used to absorb the excess charge when the distribution box leaks. The local ground wire 200 and the public ground wire may be copper wires with a diameter of 6 mm and a length of at least 20 meters, but are not limited thereto. The voltage of the commercial power in this embodiment may be 110V or 220V.

1 and FIG. 2 again, the protection device 300 of the embodiment of the present invention may include a signal detection circuit 310 and a controller 320, wherein the controller 320 is electrically connected to the signal detection circuit 310 and the leakage protection circuit 100, respectively.

In this embodiment, the signal detection circuit 310 is used to detect the first voltage between the common ground contact and the start point 210 of the local ground line, the second voltage between the common ground contact point and the end point 220 of the local ground line, and the start point of the local ground line. The third voltage between 210 and the local ground terminal 220.

The controller 320 is configured to detect the ratio between the first difference value and the mean value of the first voltage obtained within a preset time period before the current time, and the second difference value and the second voltage obtained during the preset time period before the current time. When any one of the ratio of the average value and the third difference value to the average value of the third voltage detected in the preset time period before the current moment is greater than the preset ratio threshold, a trigger signal is output to the leakage protection circuit 100 to trigger the leakage protection circuit 100 disconnected. Wherein, the first difference is the difference between the first voltage detected at the current moment and the average value of the first voltage detected within a preset time period before the current moment; the second difference is the sum of the second voltage detected at the current moment The difference between the average value of the second voltage detected in the preset time period before the current time; the third difference is the average value of the third voltage detected at the current time and the third voltage detected in the preset time period before the current time The difference.

The size of the preset ratio threshold can be set as needed. For example, the preset ratio threshold can be 3%. When any ratio exceeds the preset ratio threshold, the change in any one of the first voltage, the second voltage, and the third voltage is explained. Larger, the common ground contact, the local ground start 210 and the local ground end 220 may not share the same ground, and the line has risks such as leakage and overcurrent. The protection device 300 of the embodiment of the present invention monitors the public ground in real time through the signal detection circuit 310 The first voltage between the contact and the local ground start 210, the second voltage between the common ground contact and the local ground end 220, and the third voltage between the local ground start 210 and the local ground end 220, control When any one of the first voltage, the second voltage, and the third voltage changes greatly, the device 320 controls the leakage protection circuit 100 to be disconnected, thereby cutting off the power supply (ie, cutting off the power supply of the distribution box), and ensuring the safety of electricity use.

In other embodiments, the controller 320 is configured to detect that the ratio of the mean value of the first voltage obtained during the preset time period before the current time to the first difference is greater than the first preset ratio threshold, and/or the second difference The ratio of the value to the mean value of the second voltage detected in the preset time period before the current moment is greater than the second preset ratio threshold, and/or the third difference is greater than the third voltage detected in the preset time period before the current moment When the average value of is greater than the third preset ratio threshold, a trigger signal is output to the leakage protection circuit 100 to trigger the leakage protection circuit 100 to disconnect. In this embodiment, some of the first preset ratio threshold, the second preset ratio threshold, and the third preset ratio threshold are not equal. Understandably, the magnitudes of the first preset ratio threshold, the second preset ratio threshold, and the third preset ratio threshold can be set as needed.

The size of the preset time period can also be set as required, for example, the size of the preset time period can be 1 second or other. Illustratively, the controller 320 samples once every 1 millisecond, obtains the first voltage, the second voltage, and the third third, and calculates the average value of the data sampled in the previous second every second.

In some embodiments, referring to FIG. 3, the signal detection circuit 310 includes a comparator 311, and the number of the comparator 311 is at least three.

In this embodiment, the non-inverting input terminal of one of the at least three comparators 311 is used to connect the common ground point and one of the local ground line starting point 210, and the inverting input terminal is used to connect the common ground point and the local ground. The other of the line starting point 210; the non-inverting input terminal of one of the at least three comparators 311 is used to connect to one of the common ground point and the local ground line terminal 220, and the inverting input terminal is used to connect the common ground point And the other of the local ground terminal 220; and the non-inverting input terminal of one of the at least three comparators 311 is used to connect one of the local ground terminal 210 and the local ground terminal 220, and the inverting input terminal It is used to connect the other one of the local ground line starting point 210 and the local ground line ending point 220.

For example, please refer to FIG. 3 again. In some embodiments, the number of comparators 311 is 6, including a first comparator, a second comparator, a third comparator, a fourth comparator, a fifth comparator, and a first comparator. Six comparators. Among them, the non-inverting input terminal of the first comparator is used to connect to the common ground point, and the inverting input terminal is used to connect to the local ground line 210; the non-inverting input terminal of the second comparator is used to connect to the common ground point, and the inverting input terminal is used to To connect the local ground terminal 220; the non-inverting input terminal of the third comparator is used to connect the local ground terminal 210, the inverting input terminal is used to connect the local ground terminal 220; the non-inverting input terminal of the fourth comparator is used to connect the local The ground line start 210, the inverting input terminal is used to connect to the common ground point; the non-inverting input terminal of the fifth comparator is used to connect the local ground terminal 220, and the inverting input terminal is used to connect to the common ground point; the non-inverting input terminal of the sixth comparator is used to connect to the common ground point The input terminal is used to connect the local ground terminal 220, and the inverting input terminal is used to connect the local ground terminal 210. In this embodiment, the common ground contact, the local ground start 210, and the local ground end 220 are combined in pairs to input a comparator 311, because the common ground contact, the local ground start 210 and the local ground end 220 are combined in pairs. The voltage level is uncertain, so the positive and negative exchanges are combined again.

For example, in some embodiments, the number of comparators 311 is 3, including a seventh comparator, an eighth comparator, and a ninth comparator. The non-inverting input terminal of the seventh comparator is used to connect to the common ground point, and the inverting input terminal is used to connect to the local ground start 210, or the non-inverting input terminal of the seventh comparator is used to connect the local ground start 210, and the inverting input The terminal is used to connect to a common ground point. The non-inverting input terminal of the eighth comparator is used to connect to the common ground point, and the inverting input terminal is used to connect to the local ground terminal 220, or the non-inverting input terminal of the eighth comparator is used to connect to the local ground terminal 220. The input terminal is used to connect to a common ground point. The non-inverting input terminal of the ninth comparator is used to connect to the local ground line starting point 210, and the inverting input terminal is used to connect to the local ground line ending point 220. Optionally, one of the comparators 311 and the other comparator 311, or the non-inverting input terminal of the ninth comparator is used to connect the local ground terminal 220, and the inverting input terminal is used to connect the local ground terminal 210. This embodiment is applicable to the situation where the voltage levels in the two-by-two combinations of the common ground contact, the local ground start 210 and the local ground end 220 are known. Specifically, the non-inverting input terminal of the seventh comparator is used to connect the common ground point and The voltage at the start point 210 of the local ground line is larger, and the inverting input terminal is used to connect the common ground point and the point where the voltage at the start point 210 of the local ground line is smaller. The non-inverting input terminal of the eighth comparator is used to connect the common ground point and the local ground terminal 220 with the larger voltage, and the inverting input terminal is used to connect the common ground point and the local ground terminal 220 with the smaller voltage. The non-inverting input terminal of the ninth comparator is used to connect the voltage between the local ground line start 210 and the local ground terminal 220, and the inverting input terminal is used to connect the voltage at the local ground line start 210 and the local ground terminal 220. The smaller.

Understandably, the number of comparators 311 can also be other numerical values greater than three. In addition, the embodiment of the present application does not specifically limit the type of the comparator 311. Optionally, the comparator 311 is a differential amplifier.

Optionally, referring to FIG. 3 again, the non-inverting input terminal of one comparator 311 of the at least three comparators 311 is connected to one of the common ground point and the local ground starting point 210 through the first resistor R1, and the inverting input terminal is connected through the first resistor R1. The first resistor R1 is connected to the other of the common ground point and the local ground line starting point 210; the non-inverting input terminal of one of the at least three comparators 311 is connected to the common ground point and the local ground line end point 220 via the first resistor R1. One of the inverting input terminals is connected to the other of the common ground point and the local ground terminal 220 through the first resistor R1; and the non-inverting input terminal of one of the at least three comparators 311 through the first resistor R1 One of the local ground start 210 and the local ground end 220 is connected, and the inverting input terminal is connected to the other of the local ground start 210 and the local ground end 220 via the first resistor R1.

Further, referring to FIG. 3 again, a second resistor R2 is connected in series between the non-inverting input terminal and the inverting input terminal of each comparator 311.

The resistance values of the first resistor R1 and the second resistor R2 can be selected according to requirements. For example, the size of the first resistor R1 is 100 megaohms, and the size of the second resistor R2 is 1 megaohms.

Optionally, the controller 320 includes a single-chip microcomputer, such as ARM (Advanced RISC Machines, RISC microprocessor), AVR (RISC reduced instruction set high-speed 8-bit single-chip microcomputer), etc.; of course, the controller 320 may also include a dedicated chip, etc. Devices that can process and transmit data, such as ASIC (Application Specific Integrated Circuit) chips, can also be FPGA (Field-Programmable Gate Array), CPLD (Complex Programmable Logic Device), complex Programmable logic device) and other programmable devices.

Referring to FIG. 2, the leakage protection circuit 100 may include a leakage protector 110 and a leakage switch 120 connected in series, wherein the leakage protector 110 is used to connect the live and neutral wires of the mains, and the leakage protection switch and the protection device 300 control器320 is electrically connected.

Please refer to FIG. 2 again, the protection device 300 may also include a test button 330 which is electrically connected between the local ground start 210 and the local ground end 220 to disconnect or connect the local ground start 210 and the local ground. The ground terminal 220 is electrically connected; and the test button 330 is also electrically connected to the leakage switch 120. When the test button 330 is disconnected, the electrical connection between the local ground start 210 and the local ground end 220 is disconnected, and the controller 320 is used to obtain the state of the leakage protection circuit 100 (that is, the state of the leakage switch 120) to determine the leakage protection Whether the circuit 100 is on. The test button 330 can be used to check whether the electrical connection between the local ground start 210 and the local ground end 220 is disconnected, and whether the test button 330 will trigger the shutdown of the leakage protection circuit 100 as a normal inspection.

2 and 4A, the protection device 300 may also include a load 340. The ground of the load 340 is connected in series with the start point 210 of the local ground line or the end point of the local ground line 200. In this way, the ground line of any load 340 is disconnected. Can be found immediately. That is, it is connected in series with the ground of each load 340 from the start point 210 of the local ground. Figures 4B (T-shaped connection) and Figure 4C (distributed-line connection) are wrong connections. In Figures 4A-4C, the empty connection part refers to an open circuit. The load 340 in the embodiment of the present application may include any load, and may also include a connector such as a socket capable of connecting any load.

In the embodiment of the present invention, referring to FIG. 2, one end of the test button 330 is connected to one end of the ground wire of the load 340 to realize the connection between the test button 330 and the local ground wire starting point 210; the other end of the test button 330 is connected to the load 340 The other end of the ground wire is connected to realize the connection between the test button 330 and the local ground wire terminal 220.

The embodiment of the present invention also provides a power distribution box. Please refer to FIG. Among them, the leakage protection circuit 100 is used to connect the live wire and the neutral wire of the mains power supply to connect to the power source. The local ground 200 is connected in series with the common ground.

Optionally, the public ground wire and the local ground wire 200 are connected in series through the water immersion contactless protector 400. Please refer to FIG. 2 again, the public ground wire is connected to one end of the water immersion non-contact protector 400, and the local ground wire starting point 210 is connected to the other end of the water immersion non-contact protector 400 to realize the connection between the public ground wire and the local ground wire 200 The series connection.

Please refer to FIG. 2 again. The leakage protection circuit 100 includes a leakage protector 110 and a leakage switch 120 connected in series. The leakage protector 110 is used to connect the live and neutral wires of the mains electricity, and the leakage protection switch and the controller 320 of the protection device 300 Electric connection. The leakage switch 120 may be a leakage air switch or other types of leakage switches.

The above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, a person of ordinary skill in the art should understand that: The recorded technical solutions are modified, or some of the technical features are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

A protection device for a power distribution box, the power distribution box including a leakage protection circuit (100) and a local ground wire (200), the leakage protection circuit (100) is used to access the live and neutral wires of the mains , To access the power source, the local ground wire (200) is connected in series with the public ground wire; characterized in that, the protection device (300) includes:

The signal detection circuit (310) is used to detect the first voltage between the common ground contact and the start point (210) of the local ground, the second voltage between the common ground contact and the end point (220) of the local ground, and the local The third voltage between the start point of the ground wire and the end point (220) of the local ground wire; and

The controller (320) is electrically connected to the signal detection circuit (310) and the leakage protection circuit (100) respectively;

The ratio of the first difference to the average value of the first voltage detected within a preset time period before the current moment, and the ratio of the second difference to the average value of the second voltage detected within the preset time period before the current moment When any one of the third difference value and the average value of the third voltage detected in the preset time period before the current moment is greater than the preset ratio threshold, the controller (320) outputs a trigger signal to the leakage protection Circuit (100) to trigger the disconnection of the leakage protection circuit (100);

Wherein, the first difference is the difference between the first voltage detected at the current moment and the average value of the first voltage detected within a preset time period before the current moment;

The second difference is the difference between the second voltage detected at the current moment and the average value of the second voltage detected within a preset time period before the current moment;

The third difference is the difference between the third voltage detected at the current moment and the average value of the third voltage detected within a preset time period before the current moment.
The protection device according to claim 1, wherein the signal detection circuit (310) comprises at least three comparators (311);

The non-inverting input terminal of one comparator (311) of the at least three comparators (311) is used to connect the common ground point and one of the local ground line starting point (210), and the inverting input terminal is used to Connecting the other one of the common ground point and the local ground wire starting point (210);

The non-inverting input terminal of one of the at least three comparators (311) is used for connecting the common ground point and one of the local ground terminal (220), and the inverting input terminal is used for Connecting the other one of the common ground point and the local ground wire end point (220);

And the non-inverting input terminal of one comparator (311) of at least three comparators (311) is used to connect one of the local ground line start point (210) and the local ground line end point (220), and vice versa. The phase input terminal is used to connect the other of the local ground line start point (210) and the local ground line end point (220).
The protection device according to claim 2, wherein the number of the comparators (311) is 6, including a first comparator, a second comparator, a third comparator, a fourth comparator, and a fifth comparator. And the sixth comparator;

Wherein, the non-inverting input terminal of the first comparator is used to connect to the common ground point, and the inverting input terminal is used to connect to the start point of the local ground (210);

The non-inverting input terminal of the second comparator is used to connect to the common ground point, and the inverting input terminal is used to connect to the local ground terminal (220);

The non-inverting input terminal of the third comparator is used to connect to the local ground line start point (210), and the inverting input terminal is used to connect to the local ground line end point (220);

The non-inverting input terminal of the fourth comparator is used to connect to the local ground line start point (210), and the inverting input terminal is used to connect to the common ground point;

The non-inverting input terminal of the fifth comparator is used to connect to the local ground terminal (220), and the inverting input terminal is used to connect to the common ground point;

The non-inverting input terminal of the sixth comparator is used to connect the local ground terminal (220), and the inverting input terminal is used to connect the local ground terminal (210).
The protection device according to claim 1, wherein the controller (320) comprises a single-chip microcomputer.
The protection device according to claim 1, characterized in that the protection device (300) further comprises a test button (330) electrically connected to the start point (210) of the local ground wire and the end point (220) of the local ground wire. ) To disconnect or connect the electrical connection between the start point (210) of the local ground wire and the end point (220) of the local ground wire;

When the test button (330) is disconnected, the electrical connection between the local ground wire start point (210) and the local ground wire end point (220) is disconnected, and the controller (320) is used to obtain the leakage current The state of the protection circuit (100) is used to determine whether the leakage protection circuit (100) is on.
The protection device according to claim 1, characterized in that, the protection device (300) further comprises a load (340), and the ground of the load (340) is connected to the start point (210) of the local ground or the The end points of the local ground wire are connected in series.
A power distribution box, characterized in that, the power distribution box includes:

Leakage protection circuit (100), used to connect the live and neutral wires of the mains power supply to connect to the power source;

The local ground wire (200) is connected in series with the public ground wire; and

The protection device (300) according to any one of claims 1-6.
The distribution box according to claim 7, characterized in that, the public ground wire and the local ground wire (200) are connected in series through a water immersion non-contact protector (400).
The distribution box according to claim 7, wherein the leakage protection circuit (100) comprises a leakage protector (110) and a leakage switch (120) connected in series, and the leakage protector (110) is used for The live line and the neutral line of the mains electricity are connected, and the leakage protection switch is electrically connected with the controller (320) of the protection device (300).
The distribution box according to claim 9, wherein the leakage switch (120) is a leakage air switch.