Variable-pitch grounding device
By using the dynamic sliding contact design of the variable pitch grounding device, the high cost and resonant overvoltage problems of the neutral point direct grounding system are solved, the stability and current conduction efficiency of the grounding circuit are improved, the current conduction efficiency and safety of leakage current are enhanced, and the stability and effectiveness of the stable grounding connection in harsh environments are adapted to the stability and stability of the grounding connection in harsh environments, adapting to the stability of the grounding connection in harsh environments or for mobile devices or in harsh environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-16
- Publication Date
- 2026-03-20
AI Technical Summary
In existing technologies, power systems with directly grounded neutral points have high requirements for the grounding grid, which increases costs and is prone to causing resonant overvoltages and large short-circuit currents, leading to equipment damage and unnecessary power outages.
A variable-pitch grounding device is adopted, which realizes current transmission through dynamic sliding contact. It uses highly conductive materials and sliding contact finger design to reduce the grounding loop impedance and improve current conduction efficiency and safety.
It reduces the grounding loop impedance, improves the efficiency and safety of leakage current conduction, reduces maintenance costs, and ensures a stable grounding connection in mobile devices or harsh environments.
Smart Images
Figure CN224021063U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power grid system technical field especially is related to a variable distance grounding device. BACKGROUND
[0002] The industrial switch cabinet metal shell can quickly guide the leakage current into the earth through grounding, avoid forming a dangerous loop when the human body contacts the electrified shell, reduce the risk of electric shock injury, and the shell potential is equal to the earth after grounding, even if the personnel touches the shell, the current preferentially flows into the earth through the low resistance grounding wire, rather than through the human body.
[0003] In the prior art, the neutral point is usually directly grounded, although the neutral point direct grounding can inhibit the abnormal voltage rise caused by insulation damage, ensure the stable operation of the power system, and maintain the system voltage stability, but the system with neutral point direct grounding has high requirements for the grounding net, and is easy to cause resonance overvoltage or generate large short-circuit current.
[0004] Firstly, the system with neutral point direct grounding requires the grounding net to have a low grounding resistance to ensure that the short-circuit current can be effectively shunted under fault conditions, which requires more resources to build and maintain the grounding net, increasing the cost of the system; secondly, under certain conditions, the system with neutral point direct grounding may have resonance phenomenon, thereby causing overvoltage, which may threaten the equipment with low insulation level and increase the risk of equipment damage; finally, when a single-phase grounding fault occurs, due to the neutral point direct grounding, a low-impedance loop is formed, resulting in a large short-circuit current flowing through the fault point, which not only damages the equipment, but also may cause the action of the relay protection device, resulting in unnecessary power outage.
[0005] Therefore, a variable distance grounding device is provided to solve the above problems. UTILITY MODEL CONTENTS
[0006] The utility model aims at providing a variable distance grounding device, which realizes current transmission through dynamic sliding contact, reduces grounding loop impedance and maintenance cost, improves leakage current flow efficiency, flow safety and flow stability, and ensures stable grounding connection in mobile equipment or harsh environment.
[0007] To achieve the above purpose, the utility model provides a variable distance grounding device, which comprises a riding beam and a grounding contact support arranged outside the riding beam, a grounding contact device is arranged inside the grounding contact support, a mobile copper bar is arranged at the bottom of the grounding contact device, a mobile end grounding equipment is arranged at one end of the mobile copper bar, and a fixed end grounding equipment is arranged on the side of the grounding contact device away from the mobile end grounding equipment.
[0008] Preferably, the ground contact device comprises a ground contact fixed frame, the bottom of the ground contact fixed frame is provided with a ground contact piece, the ground contact fixed frame and the ground contact piece are fixedly connected through a first bolt structure, and the number of the first bolt structure is two.
[0009] Preferably, the first bolt structure comprises a first screw rod and a first nut, the first screw rod is connected with the first nut in sequence through the ground contact piece and the ground contact fixed frame, the surface of the first screw rod is provided with a pressure spring, and a first flat washer is arranged between the ground contact fixed frame and the first nut.
[0010] Preferably, the ground contact fixed frame comprises a ground contact fixed frame upper frame and a ground contact fixed frame lower frame, the ground contact fixed frame upper frame and the ground contact fixed frame lower frame are fixedly connected through a second bolt structure, and the number of the second bolt structure is two.
[0011] Preferably, the second bolt structure comprises a second screw rod and a second nut, the second screw rod is connected with the second nut in sequence through the ground contact fixed frame lower frame and the ground contact fixed frame upper frame, and a second flat washer is arranged between the ground contact fixed frame upper frame and the second nut.
[0012] Preferably, the ground contact piece is connected with the fixed-end grounding device through a first double-headed bolt structure, the fixed-end grounding device is connected with a protective grounding net, the first double-headed bolt structure comprises a third screw rod and third nuts arranged at two ends of the third screw rod, and third flat washers are arranged between the third nuts and the ground contact piece and between the third nuts and the fixed-end grounding device.
[0013] Preferably, the mobile copper bar is connected with the mobile-end grounding device through a second double-headed bolt structure, the mobile-end grounding device is connected with a use equipment shell, the second double-headed bolt structure comprises a fourth screw rod and fourth nuts arranged at two ends of the fourth screw rod, and fourth flat washers are arranged between the fourth nuts and the mobile copper bar and between the fourth nuts and the mobile-end grounding device.
[0014] Therefore, the variable-distance grounding device has the following beneficial effects:
[0015] (1) The scheme is stable in conduction, the variable-distance grounding device adopts a sliding contact finger type design, current transmission is realized through dynamic sliding contact, the contact material has high conductivity and low contact resistance, the grounding loop impedance is minimized, and the current diversion efficiency of leakage current is improved;
[0016] (2) The scheme has strong durability, the contact material meets the requirements of arc erosion resistance, welding resistance and corrosion resistance, part of the design adopts nickel plating process, and the wear resistance and oxidation resistance are considered, thereby reducing the risk of poor contact caused by long-term use;
[0017] (3) The scheme has high safety, the variable-distance grounding device integrates the safety characteristics of the slide wire, the shell is made of carbon steel, has high mechanical strength, simplifies the installation process, and reduces the maintenance cost;
[0018] (4) The scheme has outstanding reliability, the anti-vibration and anti-impact design can cope with mechanical vibration in industrial scenes, the dynamic contact point has dustproof and moisture-proof ability, and stable grounding connection can be ensured in mobile devices or harsh environments;
[0019] (5) The scheme has economy and high efficiency, the single-pole integrated design reduces line loss, and continuous power supply is supported without frequent maintenance, and the comprehensive cost performance is remarkable.
[0020] The technical scheme of the utility model will be described in further detail below with reference to the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS
[0021] Fig. 1 It is a fixed position grounding structure diagram of the variable-distance grounding device of the utility model;
[0022] Fig. 2 It is a moving position grounding structure diagram of the variable-distance grounding device of the utility model;
[0023] Fig. 3 It is a side view of the variable-distance grounding device of the utility model.
[0024] Wherein: 1, the beam; 2, the grounding contact support; 3, the grounding contact device; 4, the moving copper bar; 5, the moving end grounding equipment; 6, the fixed end grounding equipment; 7, the grounding contact fixed frame; 701, the upper frame of the grounding contact fixed frame; 702, the lower frame of the grounding contact fixed frame; 8, the grounding contact piece; 9, the first bolt structure; 901, the first screw rod; 902, the first nut; 10, the pressure spring; 11, the first flat washer; 12, the second bolt structure; 121, the second screw rod; 122, the second nut; 13, the second flat washer; 14, the first double-headed bolt structure; 141, the third screw rod; 142, the third nut; 15, the third flat washer; 16, the second double-headed bolt structure; 161, the fourth screw rod; 162, the fourth nut; 17, the fourth flat washer. DETAILED DESCRIPTION
[0025] The technical scheme of the utility model will be described in further detail below with reference to the drawings and examples.
[0026] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship will also change accordingly.
[0027] Example
[0028] like Figs. 1-3 As shown, this utility model provides a variable pitch grounding device, including a passenger beam 1 and a grounding contact bracket 2 disposed on the outside of the passenger beam 1. The grounding contact bracket 2 is provided with a grounding contact device 3 inside. The grounding contact device 3 is made of materials that meet the requirements of anti-arc erosion, anti-welding and corrosion resistance. Some designs adopt nickel plating process to take into account wear resistance and oxidation resistance, and reduce the risk of poor contact caused by long-term use.
[0029] The grounding contact device 3 has a movable copper busbar 4 at its bottom, a movable end grounding device 5 at one end of the movable copper busbar 4, and a fixed end grounding device 6 on the side of the grounding contact device 3 away from the movable end grounding device 5.
[0030] The grounding contact device 3 includes a grounding contact fixing frame 7, and a grounding contact piece 8 is provided at the bottom of the grounding contact fixing frame 7. The grounding contact piece 8 is made of materials such as copper or silver that have high conductivity and low contact resistance, which can minimize the grounding circuit impedance and improve the conduction efficiency of leakage current.
[0031] The grounding contact fixing frame 7 and the grounding contact piece 8 are fixedly connected by the first bolt structure 9. The number of the first bolt structure 9 is set to two. The first bolt structure 9 includes a first screw 901 and a first nut 902. The first screw 901 passes through the grounding contact piece 8 and the grounding contact fixing frame 7 in sequence and is connected to the first nut 902. A pressure spring 10 is provided on the surface of the first screw 901. A first flat washer 11 is provided between the grounding contact fixing frame 7 and the first nut 902.
[0032] The ground contact fixing frame 7 comprises a ground contact fixing frame upper frame 701 and a ground contact fixing frame lower frame 702, and the ground contact fixing frame upper frame 701 is fixedly connected with the ground contact fixing frame lower frame 702 through the second bolt structure 12. The number of the second bolt structure 12 is two.
[0033] The second bolt structure 12 comprises a second screw rod 121 and a second nut 122, the second screw rod 121 passes through the ground contact fixing frame lower frame 702 and the ground contact fixing frame upper frame 701 in sequence and is connected with the second nut 122, and a second flat washer 13 is arranged between the ground contact fixing frame upper frame 701 and the second nut 702.
[0034] The ground contact piece 8 is connected with the fixed end grounding device 6 through the first double-headed bolt structure 14, the fixed end grounding device 6 is connected with the protective grounding net, and the first double-headed bolt structure 14 comprises a third screw rod 141 and a third nut 142 arranged at two ends of the third screw rod 141. A third flat washer 15 is arranged between the third nut 142 and the ground contact piece 8 and between the third nut 142 and the fixed end grounding device 6.
[0035] The movable copper bar 4 is connected with the movable end grounding device 5 through the second double-headed bolt structure 16, the movable end grounding device 5 is connected with the use equipment shell, and the second double-headed bolt structure 16 comprises a fourth screw rod 161 and a fourth nut 162 arranged at two ends of the fourth screw rod 161. A fourth flat washer 17 is arranged between the fourth nut 162 and the movable copper bar 4 and between the fourth nut 162 and the movable end grounding device 5.
[0036] The variable-distance grounding process is realized through a sliding contact finger mode, the ground contact device 3 is fixed, only the movable copper bar 4 and the movable end grounding device 5 are moved, the pressure spring 10 is used to ensure that the ground contact piece 8 is in good contact with the movable copper bar 4 during the movement, current transmission is realized through dynamic sliding contact, the ground contact device 3 and the movable copper bar 4 form a contact surface through the ground contact piece 8, sufficient grounding current carrying capacity is ensured, the length of the movable copper bar 4 is the variable-distance stroke, and any distance in the formed range meets the electrical performance of excellent grounding.
[0037] The single-pole integrated design reduces line loss, and supports continuous power supply without frequent maintenance, and the comprehensive cost performance is remarkable.
[0038] Meanwhile, the safety performance of the sliding contact line is integrated, the shell is made of carbon steel, the mechanical strength is high, the installation process is simple, and the maintenance cost is low.
[0039] The anti-vibration and anti-impact design can cope with mechanical vibration in an industrial scene, the dynamic contact point has dustproof and moisture-proof capability, and stable grounding connection can be ensured in a mobile device or a harsh environment.
[0040] The transformer neutral point grounding resistance is detected, and the transformer neutral point grounding resistance is not greater than 4Ω, so that the power supply can be timely cut off by the leakage protection device when a fault occurs, and the safety operation specification of the power system is met.
[0041] Therefore, the variable distance grounding device with the above structure adopts the sliding contact finger type design, realizes current transmission through dynamic sliding contact, the contact material has high conductivity and low contact resistance, ensures that the grounding loop impedance is minimized, improves the current conducting efficiency of the leakage current, the dynamic contact point has dustproof and moisture-proof capability, ensures that stable grounding connection is maintained in mobile devices or harsh environments, reduces the maintenance cost, and improves the grounding safety and stability.
[0042] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model and not to limit them, although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the technical solutions of the utility model can still be modified or replaced, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the utility model technical solutions.
Claims
1. A variable-pitch grounding device, characterized in that, It includes a passenger beam and a grounding contact bracket disposed on the outside of the passenger beam. A grounding contact device is disposed inside the grounding contact bracket. A movable copper busbar is disposed at the bottom of the grounding contact device. A movable end grounding device is disposed at one end of the movable copper busbar. A fixed end grounding device is disposed on the side of the grounding contact device away from the movable end grounding device.
2. The variable-pitch grounding device according to claim 1, characterized in that, The grounding contact device includes a grounding contact fixing frame, and a grounding contact piece is provided at the bottom of the grounding contact fixing frame. The grounding contact fixing frame and the grounding contact piece are fixedly connected by a first bolt structure, and the number of the first bolt structure is set to two.
3. A variable-pitch grounding device according to claim 2, characterized in that, The first bolt structure includes a first screw and a first nut. The first screw passes through the grounding contact plate and the grounding contact fixing frame in sequence and is connected to the first nut. A pressure spring is provided on the surface of the first screw, and a first flat washer is provided between the grounding contact fixing frame and the first nut.
4. A variable-pitch grounding device according to claim 2, characterized in that, The grounding contact fixing frame includes an upper grounding contact fixing frame and a lower grounding contact fixing frame. The upper grounding contact fixing frame and the lower grounding contact fixing frame are fixedly connected by a second bolt structure, and the number of the second bolt structure is set to two.
5. A variable-pitch grounding device according to claim 4, characterized in that, The second bolt structure includes a second screw and a second nut. The second screw passes through the lower frame of the grounding contact fixing frame and the upper frame of the grounding contact fixing frame in sequence and is connected to the second nut. A second flat washer is provided between the upper frame of the grounding contact fixing frame and the second nut.
6. A variable-pitch grounding device according to claim 2, characterized in that, The grounding contact piece is connected to the fixed-end grounding device through a first double-ended bolt structure. The fixed-end grounding device is connected to the protective grounding grid. The first double-ended bolt structure includes a third screw and a third nut disposed at both ends of the third screw. A third flat washer is provided between the third nut and the grounding contact piece, and between the third nut and the fixed-end grounding device.
7. A variable-pitch grounding device according to claim 1, characterized in that, The movable copper busbar is connected to the movable end grounding device via a second double-ended bolt structure. The movable end grounding device is connected to the housing of the device being used. The second double-ended bolt structure includes a fourth screw and a fourth nut disposed at both ends of the fourth screw. A fourth flat washer is disposed between the fourth nut and the movable copper busbar, and between the fourth nut and the movable end grounding device.