A kind of electric testing and grounding trolley device for medium voltage switchgear

Abstract

The present invention relates to the field of grounding trolley devices, and discloses an electrical testing grounding trolley device for medium-voltage switchgear, comprising a trolley frame, a support frame is fixed to the front side of the trolley frame, a U-shaped frame is connected to the top surface of the support frame by bolts, a plurality of support insulator sensors are fixed to the front side of the U-shaped frame, a plurality of support insulator sensors are detachably provided with contact arms on the front sides, a first grounding busbar is connected to two second grounding busbars by bolts on the front side, and a third grounding busbar is connected to the front side of the two second grounding busbars by bolts. In the present invention, the device has integrated electrical testing and grounding functions, reduces the operation steps and potential risk points, reduces the risk of electric shock to operators, facilitates users to safely and reliably operate and realize busbar electrical testing and grounding, and makes the live state of the busbar clear at a glance through the intuitive display of the electric display device, effectively avoiding safety accidents caused by misjudgment.

Description

Technical Field

[0001] The invention relates to the technical field of grounding trolley devices, in particular to an electric testing grounding trolley device for medium voltage switchgear. Background Art

[0002] At present, metal-enclosed air-insulated switchgear has been widely used in power systems and substations of various voltage levels below and other industrial user substations. Due to the continuous advancement of technology and under the condition of ensuring user convenience and safety, trolley-type switchgear has come into being. Among them, for the convenience and safety of maintenance, the grounding trolley is one of the indispensable trolley equipment. Its purpose is to prevent electric shock accidents caused by mis-power transmission or malfunction of switchgear during maintenance. The widely used grounding trolley is composed of three simple contact arms and a grounding busbar, as well as plum blossom contact fingers used to connect with the grounding static contact in the cabinet.

[0003] Currently, when inspecting the busbar of medium-voltage switchgear, it is necessary to open the rear cover of the busbar room of the switch cabinet or push the test vehicle into the trolley room. After the live parts are exposed, the busbar is tested with a test pole. When there is no electricity, the busbar is hung with a grounding wire or the grounding vehicle is pushed into the trolley room for inspection. Therefore, there are the following disadvantages: This type of method is potentially dangerous, and the live parts are exposed, which may cause electric shock to the operators, thereby increasing the operating risks of the operators. Summary of the invention

[0004] The purpose of the present invention is to provide an electrical testing and grounding trolley device for medium-voltage switchgear to solve the potential dangers of this type of method. The exposed live parts may cause electric shock to the operator, thereby increasing the operating risk of the operator.

[0005] In order to achieve the above-mentioned invention objectives, the present invention adopts the following technical solutions: an electrical testing and grounding trolley device for medium-voltage switchgear, comprising a trolley frame, a support frame is fixed to the front side of the trolley frame, a U-shaped frame is connected to the top surface of the support frame by bolts, a plurality of supporting insulator sensors are fixed to the front side of the U-shaped frame, a plurality of supporting insulator sensors are detachably provided with contact arms on the front sides, an electric display device is fixed to the front side of the trolley frame, a first grounding bus is connected to the front side of the supporting insulator sensor by bolts, two second grounding busbars are connected to the front side of the first grounding busbar by bolts, and the front sides of the two second grounding busbars are respectively connected to a third grounding busbar by bolts.

[0006] Preferably, the contact arm is composed of a conductor, a plum blossom contact, and a busbar body to form a main circuit, the conductor is a welded structure, the conductor is connected to the busbar body by bolts, the conductor is connected to the supporting insulator sensor by bolts, and the plum blossom contact is detachably arranged on the front side of the conductor.

[0007] Preferably, an insulating tube is fixed to the outer wall of the conductor.

[0008] Preferably, a vent hole is provided on the top surface of the conductor.

[0009] Preferably, a plurality of bolt bodies are provided between the plum blossom contact and the conductor, and the plum blossom contact and the conductor are connected via the plurality of bolt bodies.

[0010] Preferably, a chassis is fixed to the bottom surface of the trolley frame, the bottom surface and the front side of the chassis are fixedly connected to the third grounding busbar respectively, and two pulleys are rotatably provided on the left and right sides of the outer wall of the chassis.

[0011] Preferably, a avoidance hole is opened on the front side of the chassis vehicle, and a screw is arranged inside the avoidance hole.

[0012] Preferably, washers are respectively provided between several of the bolt bodies and the plum blossom contacts.

[0013] Compared with the prior art, the electric testing and grounding trolley device for medium voltage switchgear using the above technical solution has the following beneficial effects:

[0014] 1. In use, the device has integrated power testing and grounding functions, which reduces the operation steps and potential risk points, reduces the risk of electric shock for operators, and facilitates users to safely and reliably operate the busbar power testing and grounding. Through the intuitive display of the electric display device, the live state of the busbar is clear at a glance, effectively avoiding safety accidents caused by misjudgment;

[0015] 2. During use, the modular design of the contact arm allows the staff to quickly assemble or replace parts according to actual needs. When maintenance or upgrading is required, it is only necessary to simply disassemble and replace the corresponding modules without large-scale disassembly of the entire device, which improves the convenience and efficiency of maintenance. By replacing or adding modules with different functions, the device can be easily upgraded and expanded to meet the diversified needs of power maintenance operations; the conductor adopts a welding structure. This process not only enhances the conductivity of the conductor, reduces resistance and energy loss, but also improves the mechanical strength of the conductor, enabling it to withstand greater current shocks and mechanical stress. This design ensures the stability and safety of the current during transmission and effectively prevents failures caused by overheating or mechanical damage; the conductor is bolted to the busbar body and the supporting insulator sensor. This connection method not only simplifies the installation process, allowing the staff to quickly complete the fixing and debugging of the components, but also facilitates subsequent maintenance and replacement work. The tightness of the bolt connection also ensures good contact and stable transmission between the components, further improving the performance and reliability of the entire device;

[0016] 3. During use, when the trolley frame is pushed into the working position, the conductor, as a key part of the main circuit, starts to work. At this time, the insulating cylinder is tightly wrapped around the outer wall of the conductor to form a solid insulating barrier. This barrier effectively isolates the electrical connection between the main circuit and the trolley frame, preventing the current from accidentally leaking into the non-working area, thereby significantly improving the safety performance of the equipment. The weather resistance and wear resistance design of the insulating cylinder enable it to maintain stable insulation performance in various harsh environments. Whether it is a high temperature, humid or dusty environment, the insulating cylinder can effectively resist the erosion of external factors, extend the service life of the equipment, and reduce maintenance costs caused by environmental factors; when a high current passes through the conductor, due to the thermal effect of the current, the temperature of the conductor and the air around it will rise sharply, causing the air pressure in the cavity to increase. At this time, the exhaust hole plays a role. The bolt body plays an important role in that it allows the hot air in the cavity to be discharged in time and exchanged with the external cold air, thereby balancing the pressure difference between the cavity and the outside. This process effectively prevents equipment damage or safety hazards caused by excessive air pressure and ensures the stable operation of the equipment. When the plum blossom contact needs to be replaced to adapt to different current specifications, the presence of the bolt body makes this process simple and quick. The staff only needs to use tools to loosen the bolt body to easily remove the old plum blossom contact and install a new one. This design not only improves work efficiency, but also reduces the downtime caused by contact replacement, ensuring the continuity of power supply.

[0017] 4. In use, the chassis is connected to the third grounding busbar by fixing the bottom and front side of the chassis respectively, and the main circuit is connected to the grounding by contacting the contact piece device of the partition in the switchgear. The rotatable pulleys on both sides of the chassis play a vital role in the movement process. They not only reduce the friction resistance, so that the chassis can slide easily inside the switchgear, but also reduce the labor intensity of the operator and improve the work efficiency. At the same time, the flexibility and durability of the pulley ensure that the trolley frame can maintain stable performance during multiple push and pull processes, extending the service life of the equipment. The avoidance hole and the screw rod are conducive to the chassis to determine whether there is an avoidance hole and the size of the avoidance hole according to the position where it is placed, which reflects the high adaptability of the equipment. According to different installation environments and location requirements, the operator can decide whether to open the avoidance hole and the size of the avoidance hole by adjusting the position and number of the screw rod. This design not only meets the needs of actual use, but also improves the flexibility and versatility of the equipment. The washer set between the bolt body and the plum blossom contact plays a key role as a connection auxiliary component. They not only increase the contact area and disperse the pressure generated during bolt tightening, but also prevent the loosening of the connecting parts through their elastic properties. This design ensures a close fit and a firm connection between the plum blossom contact and the conductor, improving the conductivity and safety of the entire main circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of an embodiment.

[0019] Figure 2 Schematic cross-sectional view of the contact arm in the embodiment.

[0020] Figure 3 It is a three-dimensional schematic diagram of the plum blossom contact in the embodiment.

[0021] Figure 4 It is a three-dimensional schematic diagram of the conductor in the embodiment.

[0022] In the figure: 1. trolley frame; 2. support frame; 3. U-shaped frame; 4. support insulator sensor; 5. contact arm; 501. conductor; 502. plum blossom contact; 503. busbar body; 6. electric display device; 7. first grounding busbar; 8. second grounding busbar; 9. third grounding busbar; 10. insulation cylinder; 11. exhaust hole; 12. bolt body; 13. chassis; 14. pulley; 15. avoidance hole; 16. screw; 17. washer. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1 and Figure 2 As shown, an electric testing and grounding trolley device for medium-voltage switchgear comprises a trolley frame 1, a support frame 2 is fixed to the front side of the trolley frame 1, a U-shaped frame 3 is connected to the top surface of the support frame 2 by bolts, a plurality of supporting insulator sensors 4 are fixed to the front side of the U-shaped frame 3, contact arms 5 are detachably provided on the front sides of the plurality of supporting insulator sensors 4, an electric display device 6 is fixed to the front side of the trolley frame 1, a first grounding busbar 7 is connected to the front side of the supporting insulator sensor 4 by bolts, two second grounding busbars 8 are connected to the front side of the first grounding busbar 7 by bolts, and the front sides of the two second grounding busbars 8 are respectively connected to third grounding busbars 9 by bolts.

[0025] During use, ensure that the size of the trolley frame 1 matches the circuit breaker trolley frame of the switch cabinet to be repaired. This is the basis for ensuring smooth operation, and the operation is simple, safe and reliable for personnel; in a safe environment, the staff first withdraws the circuit breaker trolley from the trolley room and properly places it outside the switch cabinet equipment to ensure the safety of the working area. Then, the staff smoothly pushes the special trolley frame 1 into the trolley room of the switch cabinet until it reaches the working position. This step is designed to be simple and intuitive, and does not require complex operating skills. After reaching the working position, the staff observes the indicator light state of the electric display device 6 to determine whether the busbar is energized. When the indicator light is on, it indicates that the busbar is energized and needs to be operated with caution; if the indicator light is off, it means that the busbar is not energized and the next step can be performed. This power test process is fast and accurate, which effectively avoids safety accidents caused by misjudgment; after the power test is confirmed to be correct, the staff withdraws the trolley frame 1 and starts to assemble the grounding busbar system. The entire system including the first grounding busbar 7, the two second grounding busbars 8 and the third grounding busbar 9 are firmly assembled by bolt connection, ensuring the reliability and stability of grounding. The modular design of the grounding busbar system makes the assembly and disassembly process simple and fast, and improves work efficiency. After the grounding busbar system is assembled, the staff pushes the trolley frame 1 into the working position again. At this time, the contact arm 5 contacts the busbar with the support of the supporting insulator sensor 4 to achieve effective grounding of the busbar. After the grounding is completed, the maintenance of the busbar can be started. This device has integrated electrical testing and grounding functions, which reduces the operating steps and potential risk points, reduces the risk of electric shock for operators, and facilitates users to safely and reliably operate the busbar to test electricity and ground it. Through the intuitive display of the electric display device 6, the live state of the busbar is clear at a glance, effectively avoiding safety accidents caused by misjudgment.

[0026] like Figure 1-Figure 4 As shown, the contact arm 5 is composed of a conductor 501, a plum blossom contact 502, and a busbar body 503 to form a main circuit. The conductor 501 is a welded structure. The conductor 501 is connected to the busbar body 503 by bolts. The conductor 501 is connected to the supporting insulator sensor 4 by bolts. The plum blossom contact 502 is detachably arranged on the front side of the conductor 501.

[0027] In use, the modular design of the contact arm 5 allows the staff to quickly assemble or replace parts according to actual needs. When maintenance or upgrading is required, it is only necessary to simply disassemble and replace the corresponding modules without large-scale disassembly of the entire device, which improves the convenience and efficiency of maintenance. By replacing or adding modules with different functions, the device can be easily upgraded and expanded to meet the diverse needs of power maintenance operations; the conductor 501 adopts a welding structure. This process not only enhances the conductivity of the conductor 501, reduces resistance and energy loss, but also improves the mechanical strength of the conductor 501, so that it can withstand greater current shocks and mechanical stress. This design ensures the stability and safety of the current during transmission and effectively prevents failures caused by overheating or mechanical damage; the conductor 501 is connected to the busbar body 503 and the supporting insulator sensor 4 by bolts. This connection method not only simplifies the installation process, allowing the staff to quickly complete the fixing and debugging of the components, but also facilitates subsequent maintenance and replacement work. The tightness of the bolt connection also ensures good contact and stable transmission between the components, further improving the performance and reliability of the entire device.

[0028] like Figure 1-Figure 4 As shown, an insulating tube 10 is fixed to the outer wall of the conductor 501 , an exhaust hole 11 is opened on the top surface of the conductor 501 , and a plurality of bolt bodies 12 are arranged between the plum blossom contact 502 and the conductor 501 , and the plum blossom contact 502 and the conductor 501 are connected by the plurality of bolt bodies 12 .

[0029] During use, when the trolley frame 1 is pushed into the working position, the conductor 501, as a key part of the main circuit, starts to work. At this time, the insulating cylinder 10 is tightly wrapped around the outer wall of the conductor 501 to form a solid insulating barrier. This barrier effectively isolates the electrical connection between the main circuit and the trolley frame 1, preventing the current from accidentally leaking to the non-working area, thereby significantly improving the safety performance of the equipment. The weather resistance and wear resistance design of the insulating cylinder 10 enable it to maintain stable insulation performance in various harsh environments. Whether it is a high temperature, humid or dusty environment, the insulating cylinder 10 can effectively resist the erosion of external factors, extend the service life of the equipment, and reduce the maintenance cost caused by environmental factors; when a high current passes through the conductor 501, due to the thermal effect of the current, the temperature of the conductor and the air around it will rise sharply, causing the air pressure in the cavity to increase. At this time, the exhaust hole 11 plays a role. The bolt body 12 plays an important role in that it allows the hot air in the cavity to be discharged in time and exchanged with the external cold air, thereby balancing the air pressure difference between the cavity and the outside. This process effectively prevents equipment damage or safety hazards caused by excessive air pressure and ensures the stable operation of the equipment. When the plum blossom contact 502 needs to be replaced to adapt to different current specifications, the presence of the bolt body 12 makes this process simple and quick. The staff only needs to use a tool to loosen the bolt body 12 to easily remove the old plum blossom contact 502 and install a new contact. This design not only improves work efficiency, but also reduces the downtime caused by contact replacement, thereby ensuring the continuity of power supply.

[0030] like Figure 1-Figure 3 As shown, a chassis 13 is fixed to the bottom surface of the trolley frame 1, and the bottom surface and the front side of the chassis 13 are fixedly connected to the third grounding bus 9 respectively. Two pulleys 14 are rotatably provided on the left and right sides of the outer wall of the chassis 13, and an avoidance hole 15 is opened on the front side of the chassis 13. A screw 16 is provided inside the avoidance hole 15, and washers 17 are respectively provided between the plurality of bolt bodies 12 and the plum blossom contacts 502.

[0031] In use, the bottom surface and the front side of the chassis 13 are fixedly connected to the third grounding bus 9 respectively, and the contact piece device of the partition in the switch device is contacted to complete the grounding connection with the main circuit; the rotatable pulleys 14 on both sides of the chassis 13 play a vital role in the movement process. They not only reduce the friction resistance, so that the chassis 13 can slide easily inside the switch device, but also reduce the labor intensity of the operator and improve the work efficiency. At the same time, the flexibility and durability of the pulley 14 ensure that the handcart frame 1 can still maintain stable performance during multiple push-pull processes, thereby extending the service life of the equipment. The avoidance hole 15 and the screw 16 are used to make the chassis 13 determine whether there is an avoidance hole 15 and the size of the avoidance hole 15 according to the position where it is placed, which reflects the high adaptability of the equipment. According to different installation environments and location requirements, the operator can decide whether to open the avoidance hole 15 and the size of the avoidance hole 15 by adjusting the position and number of the screw 16. This design not only meets the needs of actual use, but also improves the flexibility and versatility of the equipment. The washers 17 provided between the bolt body 12 and the plum blossom contact 502 play a key role as auxiliary connection components. They not only increase the contact area and disperse the pressure generated during the bolt tightening process, but also prevent the loosening of the connection components through their elastic properties. This design ensures a close fit and a stable connection between the plum blossom contact 502 and the conductor 501, improving the conductivity and safety of the entire main circuit.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A test and grounding trolley device for medium voltage switchgear, comprising a trolley frame (1), characterized in that: A support frame (2) is fixed to the front side of the trolley frame (1); a U-shaped frame (3) is connected to the top surface of the support frame (2) by bolts; a plurality of support insulator sensors (4) are fixed to the front side of the U-shaped frame (3); a plurality of support insulator sensors (4) are detachably provided with contact arms (5) on their front sides; an electric display device (6) is fixed to the front side of the trolley frame (1); a first grounding busbar (7) is connected to the front side of the support insulator sensor (4) by bolts; two second grounding busbars (8) are connected to the front side of the first grounding busbar (7) by bolts; and the front sides of the two second grounding busbars (8) are connected to third grounding busbars (9) by bolts.

2. The electric testing and grounding trolley device for medium voltage switchgear according to claim 1 is characterized in that: The contact arm (5) is composed of a conductor (501), a plum blossom contact (502), and a busbar body (503) to form a main circuit. The conductor (501) is a welded structure. The conductor (501) and the busbar body (503) are connected by bolts. The conductor (501) and the supporting insulator sensor (4) are connected by bolts. The plum blossom contact (502) is detachably arranged on the front side of the conductor (501).

3. The electric testing and grounding trolley device for medium voltage switchgear according to claim 2 is characterized in that: An insulating cylinder (10) is fixed to the outer wall of the conductor (501).

4. The electric testing and grounding trolley device for medium voltage switchgear according to claim 3 is characterized in that: An exhaust hole (11) is provided on the top surface of the conductor (501).

5. The electric testing and grounding trolley device for medium voltage switchgear according to claim 2, characterized in that: A plurality of bolt bodies (12) are provided between the plum blossom contact (502) and the conductor (501), and the plum blossom contact (502) and the conductor (501) are connected via the plurality of bolt bodies (12).

6. The electric testing and grounding trolley device for medium voltage switchgear according to claim 1, characterized in that: A chassis (13) is fixed to the bottom surface of the trolley frame (1), the bottom surface and the front side of the chassis (13) are respectively fixedly connected to the third grounding busbar (9), and two pulleys (14) are rotatably provided on the left and right sides of the outer wall of the chassis (13).

7. The electric testing and grounding trolley device for medium voltage switchgear according to claim 6, characterized in that: The front side of the chassis vehicle (13) is provided with an avoidance hole (15), and a screw rod (16) is provided inside the avoidance hole (15).

8. The electric testing and grounding trolley device for medium voltage switchgear according to claim 5, characterized in that: Washers (17) are respectively provided between the plurality of bolt bodies (12) and the plum blossom contacts (502).

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