An electrical maintenance earthing device and system

Abstract

A power maintenance grounding device and system are disclosed, relating to the field of power safety maintenance technology. The power maintenance grounding device includes a power supply, a switch, a first relay, a second relay, and a grounding component. The power supply, switch, and grounding component are sequentially connected to form a circuit. The coil of the first relay is connected in series with the grounding component. The normally open contact of the first relay is connected to the coil of the second relay. The normally open contact of the second relay is connected to a safety indication circuit, and the normally closed contact is connected to a hazard indication circuit. The electrical logic judgment circuit formed by the relays monitors the continuity of the grounding circuit in real time. It does not require external control or computing chips and has strong self-testing capabilities. It does not rely on high-precision electronic components, has low manufacturing costs, and is easy to maintain. The device is small in size and light in weight, and is suitable for various voltage levels and different maintenance sites.

Description

Technical Field

[0001] This utility model relates to the field of power safety maintenance technology, and in particular to a power maintenance grounding device and system. Background Technology

[0002] During the operation, maintenance, and repair of power system equipment, to prevent operators from accidentally touching live parts and to ensure personal safety, a grounding wire is usually installed between the repaired part and the ground to form a reliable ground. However, traditional grounding devices often rely on manual visual inspection of the connection, making it difficult to determine whether the grounding is truly effective. This can easily lead to safety hazards, especially in complex on-site environments or when the grounding point has poor contact.

[0003] In existing technologies, patent CN102830322A uses bus potential changes to determine the grounding status, which is suitable for online detection scenarios of bus systems; CN213544683U and CN205229372U calculate the loop resistance value through sampling resistors and chips, which are technically complex and relatively expensive, and are not suitable for maintenance scenarios with large-scale applications, frequent relocation, and flexible deployment.

[0004] Therefore, there is an urgent need for a maintenance grounding device that is simple in structure, easy to carry, intuitive to operate, and low in cost, capable of self-detecting and providing real-time feedback on the closed status of grounding tools, thereby improving the safety level of on-site operations. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a power maintenance grounding device and system that is simple in structure, easy to carry, intuitive to operate and low in cost.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a power maintenance grounding device, including a power supply, a switch, a first relay, a second relay, and a grounding component. The power supply, switch, and grounding component are connected in sequence to form a circuit. The coil of the first relay is connected in series with the grounding component. The normally open contact of the first relay is connected to the coil of the second relay. The normally open contact of the second relay is connected to a safety indication circuit. Both the safety indication circuit and the danger indication circuit are connected to the power supply. The normally closed contact is connected to the danger indication circuit. The first relay is used for detection and judgment, and the second relay is used for control and drive. Risk isolation is achieved, reliability is increased, the output signal is stable, and expansion such as communication modules is convenient.

[0007] Furthermore, the first and second relays are 12V DC intermediate relays.

[0008] Furthermore, the safety indicator circuit includes a safety indicator light connected to a power source.

[0009] Furthermore, the hazard indication circuit includes a hazard indicator light connected to a power source.

[0010] Furthermore, the hazard indication circuit includes a buzzer connected to a power source.

[0011] Furthermore, the power supply, switch, first relay, second relay, and grounding assembly are installed inside an insulating housing.

[0012] Furthermore, a crossbeam is provided inside the insulating housing, and the power supply, switch, first relay and second relay are installed below the crossbeam, while a grounding component is provided above the crossbeam.

[0013] Furthermore, the crossbeam has a first copper busbar and a second copper busbar spaced apart on one side where the grounding component is located. An insulating sheet is provided between the second copper busbar and the crossbeam. The first copper busbar and the second copper busbar are connected by bolts. The grounding component is located on the first copper busbar.

[0014] Furthermore, the grounding assembly includes a first terminal and a first grounding point located on one side of the first copper busbar, and a second terminal and a second grounding point located on the other side of the first copper busbar.

[0015] As a general inventive concept, this application also provides a power maintenance grounding system, including the aforementioned power maintenance grounding device.

[0016] The beneficial effects of this utility model are as follows: It utilizes an electrical logic judgment circuit composed of relays to monitor the continuity of the grounding circuit in real time, requiring no external control or computing chips, and possesses strong self-testing capabilities; the combination of dual-color indicator lights and a buzzer clearly indicates whether the grounding is effective, greatly improving the intuitiveness of the operation; it does not rely on high-precision electronic components, resulting in low manufacturing costs and easy maintenance; the device is small in size and lightweight, suitable for various voltage levels and different maintenance sites; it adopts an independent low-voltage DC power supply, isolated from the system, avoiding the risk of accidental electric shock, and ensuring high safety. Attached Figure Description

[0017] Figure 1 This is the circuit schematic diagram of this utility model;

[0018] Figure 2 This is a front view of the structure of this utility model;

[0019] Figure 3 This is a top view of the structure of this utility model;

[0020] In the diagram: 1-Power supply, 2-Switch, 3-First relay, 4-Second relay, 5-Grounding component, 51-First terminal, 52-Second terminal, 53-First grounding point, 54-Second grounding point; 6-Safety indicator circuit, 61-Safety indicator light, 7-Danger indicator circuit, 71-Danger indicator light, 72-Buzzer, 8-Crossbeam, 81-First copper busbar, 82-Second copper busbar, 9-Insulating sheet. Detailed Implementation

[0021] Reference Figures 1-3 This embodiment of a power maintenance grounding device includes a power supply 1, a switch 2, a first relay 3 (KA1), a second relay 4 (KA2), and a grounding component 5. The power supply 1, switch 2, and grounding component 5 are connected in sequence to form a circuit. The coil of the first relay 3 is connected in series with the grounding component 5. The normally open contact of the first relay 3 is connected to the coil of the second relay 4. The normally open contact of the second relay 4 is connected to a safety indication circuit 6, and the normally closed contact is connected to a danger indication circuit 7. Both the safety indication circuit 6 and the danger indication circuit 7 are connected to the power supply 1. The first relay 3 is used for detection and judgment, and the second relay 4 is used for control and drive. This provides risk isolation, increases reliability, stabilizes the output signal, and facilitates expansion such as communication modules.

[0022] The first relay 3 and the second relay 4 are 12V DC intermediate relays, which are reliable in operation, with a switching time of less than 30ms, and have excellent anti-interference performance, making them suitable for the complex electromagnetic environment of power construction sites.

[0023] Safety indicator circuit 6 includes a safety indicator light 61 connected to power supply 1, which indicates a normal grounding status. The green light illuminates when the grounding circuit is closed and properly connected. Danger indicator circuit 7 includes a danger indicator light 71 connected to power supply 1 and / or a buzzer 72 connected to power supply 1. The danger indicator light 71 indicates an abnormal grounding (open circuit) status. When the circuit is not closed, the grounding wire is disconnected, or there is poor contact, the indicator light illuminates, and the buzzer 72 sounds an audible alarm. The buzzer 72 is an active DC buzzer, installed on the side of the device housing, with an alarm sound intensity of 85dB, sufficient to penetrate outdoor noise environments and alert operators to changes in status.

[0024] Power supply 1, switch 2, first relay 3, second relay 4, and grounding assembly 5 are installed inside an insulating housing (not shown in the figure). The insulating housing adopts a one-piece molded cuboid structure, and the entire material is industrial-grade ABS flame-retardant plastic, which balances lightness and mechanical strength, and has good insulation and weather resistance, making it suitable for outdoor power maintenance environments. The housing has an IP54 protection rating, providing basic dust and water resistance. The top of the housing has a hole for LED indicator lights, and the side has a buzzer 72 opening to ensure sound penetration.

[0025] An insulating housing has a crossbeam 8 inside, which divides the interior of the insulating housing into upper and lower layers. The power supply 1, switch 2, first relay 3, and second relay 4 are installed on one side of the crossbeam 8 (lower layer), and a grounding component 5 is installed on the other side of the crossbeam 8 (upper layer). On one side of the grounding component 5, there are a first copper busbar 81 and a second copper busbar 82 spaced apart. An insulating sheet 9 is provided between the second copper busbar 82 and the crossbeam 8. The first copper busbar 81 and the second copper busbar 82 are connected by bolts. The grounding component 5 is located on the first copper busbar 81. The grounding component 5 includes a first terminal 51, a first grounding point 53, a second terminal 52, and a second grounding point 54 located at both ends of the first copper busbar 81. The first terminal 51 and the second terminal 52 are two copper terminals with a nut-press type interface, which is compatible with 6-25mm² conventional grounding soft copper wire. The first grounding point 53 and the second grounding point 54 form the path for detecting the continuity of the detection circuit. The interface surface is tin-plated to improve oxidation resistance and ensure low contact resistance and long-term stability.

[0026] In this embodiment, the first copper busbar 81 is mainly used to connect the actual grounding circuit on site and simultaneously undertake the current conduction function. The second copper busbar 82 serves as an external visible terminal block, facilitating the operator to connect the grounding wire or grounding clamp, and playing a connection and lead-out role. The two are connected by bolts or plug-in copper busbar connectors to achieve electrical continuity and structural stability. The first grounding point 53 and the second grounding point 54 are not redundant with the first terminal block 51 and the second terminal block 52, but rather reflect the design principle of separating the electrical function and detection function of this device. The first grounding point 53 and the second grounding point 54 can be selected according to their location to connect to the external conductor to be grounded, and undertake the function of the actual grounding current path. The first terminal block 51 and the second terminal block 52 are connected to the detection branch of the first relay 3 in the circuit diagram, and are only used for blocking the signal transmission of the judgment circuit, and do not carry the working current.

[0027] Switch 2 is an air switch, mounted on the surface of the insulating housing, serving as the on / off control switch for the entire circuit, and also providing short-circuit and overcurrent protection. A small DZ47 series DC air switch 2 is selected, which has a large breaking capacity and high reliability. Components such as the first relay 3, the second relay 4, the power supply 1, and indicator lights are all mounted on a printed circuit board (PCB), which is fixed inside the insulating housing with screws.

[0028] Power supply 1 is a built-in 12V lithium battery module with a capacity of over 1500mAh, supporting continuous operation for at least 8 hours. The battery is equipped with a power protection board and a USB-C charging port, featuring overcharge and over-discharge protection to extend its lifespan. Power supply 1 is controlled by air switch 2, resulting in low overall power consumption; the power is only used to illuminate the indicator light and drive buzzer 72, making it energy-efficient.

[0029] When the grounding wire is connected to the first grounding point 53 or the second grounding point 54, the ground busbar (copper busbar connected to the ground) is set in the gap between the first copper busbar 81 and the second copper busbar 82. If the grounding wire, the first terminal 51, and the second terminal 52 are all connected to the ground busbar, and the first terminal 51 and the second terminal 52 are connected, the current can be generated through the coil of the first relay 3 to form an excitation. The first relay 3 is energized and the second relay 4 is energized through the contacts. After the second relay 4 is energized, the green light branch is closed and the red light and buzzer 72 branch is disconnected, indicating the "normal grounding" state. When the grounding wire is disconnected or has poor contact, the first relay 3 does not receive current and cannot be energized. The second relay 4 remains in the released state, and its normally closed contacts connect the red light and the buzzer 72, indicating the "abnormal grounding".

[0030] The specific working process of this utility model is as follows: After the switch 2 is turned on, the power supply 1 starts to supply power. If the grounding component 5 is well connected, the coil of the first relay 3 is energized and the first relay 3 is energized. The normally open contact closes and the second relay 4 is energized and energized, closing the safety indicator light 61 branch and simultaneously disconnecting the danger indicator light 71 and the buzzer 72 branch. If the grounding component 5 is disconnected, falls off, or has excessive contact resistance, the coil of the first relay 3 cannot be energized and remains released. The second relay 4 is also not energized and energized. At this time, its normally closed contact connects the danger indicator light 71 and the buzzer 72.

[0031] A power maintenance grounding system includes a power maintenance grounding device.

[0032] The use of a relay interlocking structure can maintain a stable operating state, avoid false alarms caused by loose connections or momentary jitter, and improve practical reliability.

[0033] This utility model device is small in size, has clear functions, intuitive alarms, and no complicated settings. It avoids reliance on chip logic judgment and external communication modules, making it particularly suitable for front-line personnel to carry and use in high-voltage field maintenance. It effectively avoids the risks of false grounding operations and improves operational safety.

[0034] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An electrical maintenance earthing device, characterised in that: The system includes a power supply (1), a switch (2), a first relay (3), a second relay (4), and a grounding component (5). The power supply (1), the switch (2), and the grounding component (5) are connected in sequence to form a circuit. The coil of the first relay (3) is connected in series with the grounding component (5). The normally open contact of the first relay (3) is connected to the coil of the second relay (4). The normally open contact of the second relay (4) is connected to the safety indicator circuit (6), and the normally closed contact is connected to the danger indicator circuit (7). Both the safety indicator circuit (6) and the danger indicator circuit (7) are connected to the power supply (1).

2. The power service grounding device of claim 1, wherein: The first relay (3) and the second relay (4) are 12V DC intermediate relays.

3. The power service grounding device of claim 1, wherein: The safety indicator line (6) includes a safety indicator light (61) connected to the power supply (1).

4. The power service grounding device of claim 1, wherein: The hazard indication circuit (7) includes a hazard indicator light (71) connected to the power supply (1).

5. The power service grounding device of claim 1, wherein: The hazard indication circuit (7) includes a buzzer (72) connected to the power supply (1).

6. A power maintenance grounding device according to any one of claims 1 to 5, characterized in that: The power supply (1), switch (2), first relay (3), second relay (4) and grounding assembly (5) are installed inside an insulating housing.

7. The power service grounding device of claim 6, wherein: The insulating housing is provided with a crossbeam (8), the power supply (1), switch (2), first relay (3) and second relay (4) are installed below the crossbeam (8), and a grounding component (5) is provided above the crossbeam (8).

8. The power service grounding device of claim 7, wherein: The crossbeam (8) has a grounding component (5) on one side, and a first copper busbar (81) and a second copper busbar (82) are spaced apart. An insulating sheet (9) is provided between the second copper busbar (82) and the crossbeam (8). The first copper busbar (81) and the second copper busbar (82) are connected by bolts. The grounding component (5) is located on the first copper busbar (81).

9. The power service grounding device of claim 8, wherein: The grounding assembly (5) includes a first terminal (51) and a first grounding point (53) located on one side of the first copper busbar (81), and a second terminal (52) and a second grounding point (54) located on the other side of the first copper busbar (81).

10. A power servicing system characterized by: Includes the power maintenance grounding device as described in any one of claims 1 to 9.

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