Grounding detection protection device suitable for FTU transformation

Abstract

The utility model relates to the technical field of grounding protection, in particular to a grounding detection protection device suitable for FTU transformation, which is arranged between an original circuit breaker of a power grid line and an FTU and is provided with an input end and an output end which are electrically connected and a first communication end and a second communication end which are in communication connection. The device comprises a current judgment module, a grounding monitoring protection module, a current protection module and an FTU monitoring module. The output end of the current judgment module is connected with the grounding monitoring protection module, and the output end of the grounding monitoring protection module is connected with the circuit breaker and the FTU and communicates with the circuit breaker through the first communication end. The input end of the FTU monitoring module is connected with the FTU and communicates through the second communication end, the output end of the FTU monitoring module is connected with the current protection module, the output end of the current protection module is connected with the circuit breaker and communicates through the first communication end, all the modules work cooperatively, and relevant operation and safety of a power grid are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of grounding protection, in particular to a grounding detection protection device suitable for FTU transformation. Background Art

[0002] With the continuous development of power systems, the safety and reliability requirements of power grid lines are increasing. In power grid lines, feeder terminal units (FTU) and pole-mounted circuit breakers are important components, and the two work together to ensure the normal operation of the power grid. However, there is a significant problem at present, that is, a large number of existing feeder terminal units FTU do not have ground fault detection function.

[0003] If the power grid line is to have the ability to detect ground faults, the FTU needs to be upgraded and reconstructed, that is, the ground detection module needs to be integrated into the FTU. The traditional modification method is to integrate the ground detection module with ground fault detection function into the FTU. However, this method faces many difficulties. First, the internal structure of the FTU itself is complex, and the modules are closely arranged, almost occupying the entire internal space, leaving very limited space for the installation of new modules. This makes the operating space narrow when installing the ground detection module, making it difficult to carry out effective installation operations, greatly increasing the difficulty of the modification. Secondly, even if the space limitation can be overcome and the new module can be installed, the lines inside the FTU need to be readjusted and connected. In addition, the existing feeder terminal device FTU is usually located on the poles and towers of the power grid line, and the construction personnel need to work at a high altitude to complete the FTU modification work. And when the FTU fails, it needs to be replaced again, which is difficult to replace. From the time the FTU fails to the time of repair, there is no protection measure for the power grid in the area.

[0004] The existing FTU transformation methods have many drawbacks, and a new product or method is urgently needed to solve these problems, so as to reduce the difficulty of transformation construction of existing FTUs and improve the safety and reliability of power grid lines. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a grounding detection protection device suitable for FTU modification in view of the deficiencies in the above-mentioned prior art, so as to solve the current technical problem that FTU modification is difficult.

[0006] The purpose of the utility model is achieved by the following technical solutions:

[0007] In the first aspect, the utility model provides a grounding detection protection device suitable for FTU modification, the grounding detection protection device is arranged between the power grid line circuit breaker and the FTU, the grounding detection protection device includes an input end electrically connected to the circuit breaker, a first communication end connected to the circuit breaker for communication, an output end electrically connected to the FTU, and a second communication end connected to the FTU for communication; the grounding detection protection device also includes: a current judgment module, a grounding monitoring protection module, a current protection module and an FTU monitoring module;

[0008] The output end of the current judgment module is connected to the grounding monitoring protection module; the output end of the grounding monitoring protection module is electrically connected to the circuit breaker and the FTU respectively; and is connected to the circuit breaker through the first communication end;

[0009] The input end of the FTU monitoring module is electrically connected to the FTU, and the FTU monitoring module is also communicatively connected to the FTU through the second communication end; the output end of the FTU monitoring module is electrically connected to the current protection module; the output end of the current protection module is electrically connected to the circuit breaker and the FTU respectively, and is communicatively connected to the circuit breaker through the first communication end.

[0010] As a further improvement of the utility model, the current protection module includes a switching circuit and a relay protector, the relay protector is used to be electrically connected to the circuit breaker, the normally closed contacts of the switching circuit are arranged on the line between the circuit breaker and the FTU, and the normally open contacts are arranged on the line between the relay protector and the circuit breaker.

[0011] As a further improvement of the present invention, the FTU monitoring module includes a signal acquisition circuit, a signal conversion circuit and a microprocessor which are electrically connected in sequence.

[0012] As a further improvement of the present utility model, the grounding detection protection device also includes a current sampling module and a third communication terminal; the input terminal of the current sampling module is electrically connected to the power grid line, and the output terminal is connected to the current judgment module through the third communication terminal; the current sampling module is provided with a sampling component socket, and the sampling component socket is used to match and connect with the plug in the sampling component.

[0013] As a further improvement of the present invention, the sampling component socket adopts an aviation socket.

[0014] As a further improvement of the present invention, the grounding detection protection device further includes a bird-repelling component, and the bird-repelling component is provided with a fourth communication terminal communicatively connected to the grounding monitoring protection module; the bird-repelling component includes an ultrasonic generator.

[0015] As a further improvement of the present invention, the grounding detection protection device also includes a first alarm indicator light and a second alarm indicator light, the first alarm indicator light is electrically connected to the grounding monitoring protection module; the second alarm indicator light is electrically connected to the current protection module.

[0016] As a further improvement of the present utility model, the first warning indicator light includes a blue LED light for warning of a high-resistance grounding fault and a red LED light for warning of an arc grounding fault.

[0017] As a further improvement of the present invention, a power supply module is provided in the grounding detection protection device, and the power supply module is electrically connected to the circuit breaker.

[0018] As a further improvement of the utility model, the grounding detection protection device also includes a battery box and a dual power switching module, the battery box is electrically connected to the power supply module, the first port of the dual power switching module is electrically connected to the circuit breaker, and the second port is electrically connected to the power supply module.

[0019] The beneficial effect of the utility model is that the current judgment module can effectively judge the current situation in the line, providing a reliable basis for the subsequent grounding monitoring and protection module to accurately identify the grounding fault, so that the occurrence of the grounding fault can be detected more timely and accurately, avoiding the further expansion of the fault to damage the power grid line and related equipment. The grounding monitoring and protection module is electrically connected and communicated with the circuit breaker. Once a grounding fault is detected, an action instruction can be quickly issued to the circuit breaker, so that the circuit breaker can cut off the fault line in time, reduce the duration of the grounding fault, and ensure the safety of power grid operation and power supply continuity. The FTU monitoring module can connect to the FTU in real time and obtain its operating status information, which is convenient for the operation and maintenance personnel to grasp the working status of the FTU in time, discover potential problems in advance and take corresponding measures, and effectively reduce the risk of power grid monitoring failure caused by FTU failure. The FTU monitoring module cooperates with the current protection module. When the FTU is abnormal or detects certain conditions that may affect the safety of the line, the current protection module can control the circuit breaker action according to relevant information, realize coordinated protection with the FTU, and further improve the reliability and integrity of the protection of the entire power grid line. The device is installed between the original circuit breakers and FTUs of the power grid line, which can make full use of the existing circuit breakers and FTU equipment, avoid the high cost and complicated construction process caused by large-scale replacement of hardware facilities, and facilitate the upgrading and transformation of existing power grid lines, so that they have better grounding detection and protection functions, thereby improving the economy and operability of power grid transformation.

[0020] Furthermore, this protection device adopts FTU redundant design. When FTU fails, the relay protector can immediately take over the high current monitoring and protection functions of the power grid line to ensure the safe operation of the power system. When FTU fails, the normally closed contacts of the switching circuit are quickly disconnected, cutting off the connection between FTU and the circuit breaker to prevent the fault current from continuing to pass through the damaged FTU. The normally open contacts are quickly closed to connect the relay protector to the circuit so that it can immediately take over the protection function. The fast switching mechanism ensures the continuity and timeliness of the protection function, which can effectively reduce the scope of the fault's impact on the power grid and avoid the expansion of the fault leading to more serious power accidents.

[0021] Furthermore, the signal acquisition circuit in the FTU monitoring module is responsible for obtaining the status signal from the FTU to achieve accurate signal acquisition, and the signal conversion circuit converts the analog signal into a digital signal that can be processed by the microprocessor. The FTU monitoring module can accurately and reliably collect signals, effectively convert and process signals, and give full play to the advantages of the microprocessor based on the signal acquisition circuit, signal conversion circuit and microprocessor, thereby achieving comprehensive monitoring and effective protection of the FTU. The signal acquisition circuit, signal conversion circuit and microprocessor are designed as independent modules to facilitate separate testing, maintenance and replacement.

[0022] Furthermore, the current sampling module can collect the current signal in the power grid in real time and accurately. The current data is collected by using a sampling component. The sampling component makes the current sampling module scalable and flexible through the design of the socket, and also simplifies the installation process. The third communication terminal allows two-way communication between the current sampling module and the sampling component. This not only helps to transmit the sampling data in real time, but also monitors and controls the working status of the sampling component.

[0023] Furthermore, the aviation socket is compact in design, and the plugging and unplugging operation is simple and quick, without complicated tools or steps, which improves work efficiency. The existing aviation socket is equipped with a reliable locking mechanism to ensure that the plug and the socket are tightly connected to avoid loosening or falling off due to vibration or other external forces.

[0024] Furthermore, the bird-repelling component is connected to the grounding monitoring and protection module through the fourth communication terminal to realize the bird-repelling operation. When the grounding monitoring and protection module detects that the operating state of the power grid line has changed, the bird-repelling operation is performed to reduce manual intervention and reduce labor costs.

[0025] Furthermore, the blue LED light is used to warn of high-resistance grounding faults, and the red LED light is used to warn of arc grounding faults. This design enables maintenance personnel to quickly determine the fault type when a grounding fault occurs, so as to take appropriate measures. The color distinction makes the fault handling process clearer and improves the efficiency of fault handling. LED lights of different colors not only provide clear indications when a fault occurs, but also facilitate maintenance personnel to quickly identify and locate the fault point during daily maintenance and inspection. The maintenance process is simplified through visual indication and maintenance costs are reduced.

[0026] Furthermore, the power supply module realizes centralized power supply management by connecting to the circuit breaker, thereby reducing the number and complexity of external power lines.

[0027] Furthermore, the battery box serves as a backup power source, forming a dual power supply system with the main power supply (such as circuit breaker power supply). When the main power supply fails or loses power, the dual power supply switching module can automatically and seamlessly switch to battery power supply to ensure the continuous operation of the ground detection protection device and avoid protection failure caused by power interruption. The dual power supply switching module provides a redundant power supply solution and enhances the fault tolerance of the system. Even if one power supply fails, the other power supply can still ensure the normal operation of the device, improving the reliability and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of a grounding detection protection device suitable for FTU modification in an embodiment of the utility model.

[0030] Figure 2 It is a structural schematic diagram of the FTU monitoring module in an embodiment of the utility model.

[0031] Figure 3 It is a structural schematic diagram of a current protection module in an embodiment of the utility model.

[0032] Figure 4 It is a structural diagram of a grounding detection protection device suitable for FTU modification in an embodiment of the utility model.

[0033] In the figure, 1. grounding detection protection device; 2. circuit breaker; 3. FTU; 4. current judgment module; 5. grounding monitoring protection module; 6. current protection module; 7. FTU monitoring module; 8. current sampling module; 9. bird repellent component; 10. power supply module; 11. battery box; 12. dual power switching module; 13. first alarm indicator light; 14. second alarm indicator light; 15. terminal block; 61. switching circuit; 62. relay protection; 71. signal acquisition circuit; 72. signal conversion circuit; 73. microprocessor. DETAILED DESCRIPTION

[0034] In order to make the purpose and technical solution of the utility model clearer and easier to understand, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. The specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0035] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, wherein the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0036] Example 1

[0037] like Figures 1 to 4 As shown, this embodiment provides a grounding detection protection device suitable for FTU modification. The grounding detection protection device 1 is arranged between the circuit breaker 2 and the FTU 3 on the power grid line, and includes an input end electrically connected to the circuit breaker 2, a first communication end communicatively connected to the circuit breaker 2, an output end electrically connected to the FTU 3, and a second communication end communicatively connected to the FTU 3.

[0038] like Figure 1 , Figure 4 As shown, the grounding detection protection device 1 includes: a current judgment module 4, a grounding monitoring protection module 5, a current protection module 6 and a FTU monitoring module 7.

[0039] The output end of the current judgment module 4 is connected to the grounding monitoring protection module 5 in communication; the output end of the grounding monitoring protection module 5 is electrically connected to the circuit breaker 2 and the FTU 3 respectively, and the grounding monitoring protection module 5 is connected to the circuit breaker 2 in communication through the first communication end. The grounding monitoring protection module 5 is connected to the circuit breaker 2 and the FTU 3 respectively through cables. In addition, the communication connection in this embodiment is realized by optical fiber network cable, and the electrical connection is realized by cable.

[0040] Among them, the grounding detection protection device 1 also includes a current sampling module 8 and a third communication terminal; the input end of the current sampling module 8 is electrically connected to the power grid line, and the output end is communicatively connected to the input end of the current judgment module 4 through the third communication terminal. The current sampling module 8 is provided with a sampling component socket, and the sampling component socket is used to match and connect with the plug in the sampling component. Among them, the sampling component socket adopts an aviation socket, and the cable is connected through the aviation socket, and is connected to the current judgment module 4 in the grounding detection protection device 1 through the cable. The sampling component in this embodiment is a current transformer, which collects the three-phase sampling current in the power grid line in real time. Among them, the third communication terminal is arranged inside the grounding detection protection device 1.

[0041] The current judgment module 4 includes a signal conversion unit and a judgment unit. The signal conversion unit uses an analog-to-digital converter to convert the input three-phase sampled current signal. The judgment unit compares the sampled current signals and thresholds between the three phases. When a phase current signal is different from the other two phase current signals and exceeds the first threshold, it is considered to be a high-resistance grounding fault and a first fault signal is generated. When a phase current signal is different from the other two phase current signals and exceeds the second threshold, it is considered to be an arc grounding fault and a second fault signal is generated. The grounding monitoring protection module 5 drives the circuit breaker 2 according to the fault signal. Among them, the first threshold and the second threshold are not the same. The judgment unit judges the high-resistance grounding fault first and then the arc grounding fault in the order of judging the high-resistance grounding fault first and then the arc grounding fault. When the judgment unit judges any of the above faults, it stops judging and generates a corresponding fault signal. Therefore, the judgment result of the judgment unit only has three situations: the first fault signal, the second fault signal or no fault.

[0042] In addition, if Figure 4 As shown, the present embodiment is also provided with a first alarm indicator light 13, and the first alarm indicator light 13 is connected to the grounding monitoring protection module 5 through a terminal block 15. The first alarm indicator light 13 includes a blue LED (Light-Emitting Diode) lamp for warning of a high-resistance grounding fault and a red LED lamp for warning of an arc grounding fault. When the grounding monitoring protection module 5 receives the first fault signal, the blue LED lamp is triggered to light up and flash at a specific frequency (such as flashing twice per second), alerting the operation and maintenance personnel that a high-resistance grounding fault has occurred. When the grounding monitoring protection module 5 receives the second fault signal, the red LED lamp is lit and flashes quickly (such as flashing 5 times per second).

[0043] The input end of the FTU monitoring module 7 is electrically connected to the FTU 3, and is communicatively connected to the FTU 3 through the second communication end; the output end of the FTU monitoring module 7 is electrically connected to the current protection module 6; the output end of the current protection module 6 is electrically connected to the circuit breaker 2 and FTU3 respectively, and the current protection module 6 is communicatively connected to the circuit breaker 2 through the first communication end.

[0044] like Figure 2 As shown, the FTU monitoring module 7 includes a signal acquisition circuit 71, a signal conversion circuit 72 and a microprocessor 73 which are electrically connected in sequence. The signal acquisition circuit 71 is used to collect the current signal and voltage signal of the FTU 3. The signal conversion circuit 72 is used to perform analog-to-digital conversion on the current signal and the voltage signal. The microprocessor 73 compares the converted current signal and voltage signal with the signal of normal operation to determine whether the FTU 3 is abnormal and obtain an abnormal signal. The abnormal situation includes, for example, communication interruption, data abnormality or internal circuit failure. The current protection module 6 starts the protection action according to the abnormal signal of the FTU monitoring module 7.

[0045] like Figure 3 As shown, the current protection module 6 includes a switching circuit 61 and a relay protector 62. The relay protector 62 is used to be electrically connected to the circuit breaker 2, and is used to replace the FTU 3 to monitor the large current of the power grid line when the FTU 3 fails. The normally closed contact of the switching circuit 61 is set on the line between the circuit breaker 2 and the FTU 3, and the normally open contact is set on the line between the relay protector 62 and the circuit breaker 2. When the FTU 3 fails, the normally closed contact is actuated to switch the circuit breaker 2 and the FTU 3, and the normally open contact is closed to connect the relay protector 62 to the circuit, so that it can monitor and protect the power grid line.

[0046] In addition, the protection device further comprises a second warning indicator light 14 electrically connected to the current protection module 6. The indicator light is used to warn when the FTU 3 fails.

[0047] The grounding detection protection device 1 further includes a bird-repelling component 9, which is provided with a fourth communication terminal connected to the grounding monitoring protection module 5; the bird-repelling component 9 includes an ultrasonic generator. The ultrasonic generator is connected to the grounding monitoring protection module 5, and when the grounding monitoring protection module 5 receives a fault signal, the ultrasonic generator is triggered to emit an ultrasonic wave of a set frequency according to a set working frequency, so as to achieve the effect of repelling birds and avoid interference of birds with power equipment.

[0048] In addition, the ultrasonic generator in the bird-repelling component 9 also operates according to a preset working mode. For example, when the ground monitoring and protection module detects that there are frequent bird activities around the power grid line, a start signal is sent to the bird-repelling component 9 through the fourth communication terminal, and the ultrasonic generator generates ultrasonic waves of a specific frequency to stimulate the birds, keep them away from the power grid line, and prevent the birds from causing damage to the power grid facilities, thereby further ensuring the safety and reliability of the power grid operation.

[0049] In summary, the electrical connection between the modules in this embodiment is as follows: the input end of the current judgment module 4 is connected to the sampling component in the current sampling module 8, and the output end is connected to the grounding monitoring protection module 5; the output end of the grounding monitoring protection module 5 is electrically connected to the circuit breaker 2 and the FTU 3 respectively; the input end of the current protection module 6 is connected to the output end of the FTU monitoring module 7, and the output end is connected to the circuit breaker 2 and the FTU 3 respectively; the input end of the FTU monitoring module 7 is connected to the FTU 3. In addition, the output of the grounding monitoring protection module 5 is also connected to the first alarm indicator light 13; the output end of the current protection module 6 is also connected to the second alarm indicator light 14.

[0050] The current judgment module 4 is connected in communication with the grounding monitoring and protection module 5, and the current judgment module 4 is also connected in communication with the sampling component in the current sampling module 8 through the third communication terminal; the grounding monitoring and protection module 5 is connected in communication with the circuit breaker 2 through the first communication terminal; in addition, the grounding monitoring and protection module 5 is also connected in communication with the bird-repelling component 9 through the fourth communication terminal. The FTU monitoring module 7 is connected in communication with the FTU 3 through the second communication terminal, and the current protection module 6 is connected in communication with the circuit breaker 2 through the first communication terminal.

[0051] A power supply module 10 is provided in the grounding detection protection device 1. The power supply module 10 is electrically connected to the circuit breaker 2, and the power is taken from the circuit breaker 2 to supply power to each module in the grounding detection protection device 1. In addition, the protection device also includes a battery box 11 and a dual power switching module 12. The battery box 11 is electrically connected to the power supply module 10. The first port of the dual power switching module 12 is electrically connected to the circuit breaker 2, and the second port is electrically connected to the power supply module 10. When the circuit breaker 2 is powered off, the dual power switching module 12 switches to the battery box 11 for power supply to ensure continuous power supply to the power supply module 10.

[0052] The protective device in this embodiment is provided with a box-type outer shell or a cover-type outer shell on the outside. The outer shell is made of a higher strength and corrosion-resistant material (such as aluminum alloy or stainless steel) to improve the protection level of the outer shell, so that it can work normally under more severe environmental conditions (such as high salt fog environment at the seaside, corrosive gas environment in chemical industry area, etc.). At the same time, a heat dissipation structure is added to the outer shell, and heat dissipation fins are added or an efficient heat dissipation fan is used to ensure that the temperature of each module inside the device can be stabilized within the normal working range in a high temperature environment, thereby improving the reliability and service life of the device.

Claims

1. A grounding detection and protection device suitable for FTU modification, characterized in that: The grounding detection protection device (1) is arranged between a power grid line circuit breaker (2) and an FTU (3), and comprises an input end electrically connected to the circuit breaker (2), a first communication end communicatively connected to the circuit breaker (2), an output end electrically connected to the FTU (3), and a second communication end communicatively connected to the FTU (3); the grounding detection protection device (1) further comprises: a current judgment module (4), a grounding monitoring protection module (5), a current protection module (6), and an FTU monitoring module (7); The output end of the current judgment module (4) is communicatively connected to the grounding monitoring and protection module (5); the output end of the grounding monitoring and protection module (5) is electrically connected to the circuit breaker (2) and the FTU (3) respectively; the grounding monitoring and protection module (5) is also communicatively connected to the circuit breaker (2) via the first communication end; The input end of the FTU monitoring module (7) is electrically connected to the FTU (2), and the FTU monitoring module (7) is also communicatively connected to the FTU (3) via the second communication end; the output end of the FTU monitoring module (7) is electrically connected to the current protection module (6); the output end of the current protection module (6) is electrically connected to the circuit breaker (2) and the FTU (3) respectively, and is communicatively connected to the circuit breaker (2) via the first communication end.

2. The grounding detection and protection device suitable for FTU modification according to claim 1 is characterized in that: The current protection module (6) comprises a switching circuit (61) and a relay protector (62), wherein the relay protector (62) is used to be electrically connected to the circuit breaker (2), the normally closed contact of the switching circuit (61) is arranged on the line between the circuit breaker (2) and the FTU (3), and the normally open contact is arranged on the line between the relay protector (62) and the circuit breaker (2).

3. The grounding detection and protection device suitable for FTU modification according to claim 1 is characterized in that: The FTU monitoring module (7) comprises a signal acquisition circuit (71), a signal conversion circuit (72) and a microprocessor (73) which are electrically connected in sequence.

4. The grounding detection and protection device suitable for FTU modification according to claim 1 is characterized in that: The grounding detection protection device (1) further comprises a current sampling module (8) and a third communication terminal; the input terminal of the current sampling module (8) is electrically connected to the power grid line, and the output terminal is connected to the current judgment module (4) via the third communication terminal; the current sampling module (8) is provided with a sampling component socket, and the sampling component socket is used to match and connect with a plug in the sampling component.

5. The grounding detection and protection device suitable for FTU modification according to claim 4 is characterized in that: The sampling component socket adopts an aviation socket.

6. The grounding detection and protection device suitable for FTU modification according to claim 1 is characterized in that: The grounding detection protection device (1) further comprises a bird-repelling component (9), wherein the bird-repelling component (9) is provided with a fourth communication terminal that is communicatively connected to the grounding monitoring protection module (5); the bird-repelling component (9) comprises an ultrasonic generator.

7. The grounding detection and protection device suitable for FTU modification according to claim 1 is characterized in that: The grounding detection protection device (1) further comprises a first warning indicator light (13) and a second warning indicator light (14), wherein the first warning indicator light (13) is electrically connected to the grounding monitoring protection module (5); and the second warning indicator light (14) is electrically connected to the current protection module (6).

8. The grounding detection and protection device suitable for FTU modification according to claim 7 is characterized in that: The first warning indicator light (13) comprises a blue LED light for warning of a high-resistance grounding fault and a red LED light for warning of an arc grounding fault.

9. The grounding detection and protection device suitable for FTU modification according to any one of claims 1 to 8, characterized in that: The grounding detection protection device (1) is provided with a power supply module (10), and the power supply module (10) is electrically connected to the circuit breaker (2).

10. The grounding detection and protection device suitable for FTU modification according to claim 1 is characterized in that: The ground detection protection device (1) further comprises a battery box (11) and a dual power switching module (12), wherein the battery box (11) is electrically connected to the power supply module (10), a first port of the dual power switching module (12) is electrically connected to the circuit breaker (2), and a second port is electrically connected to the power supply module (10).

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