A pipe bus measuring device based on direct current measurement method

Abstract

The application discloses a kind of pipe bus measuring device based on direct current measurement method, including rack, first clamp, second clamp and clamping mechanism are equipped on rack, first clamp and second clamp are all circular arc and oppositely arranged, and multiple contacts are equipped on the side opposite to first clamp and second clamp.The first clamp and the second clamp are placed on the two sides of the pipe bus during measurement, and the clamping mechanism drives the first clamp to be close to the second clamp and clamps the pipe bus, without manually fastening bolt, with high degree of automation, convenient to use, high measurement efficiency, and can be adapted to pipe bus of different diameters.The multiple contacts inside first clamp and second clamp effectively pierce the aluminum oxide insulation film on the surface of pipe bus under the set pressure, significantly reduce the film resistance, avoid scratching the pipe bus body during operation, and have good reliability.The present application can be adapted to special-shaped conductor detection, ensure the contact area with special-shaped conductor, and overcome the defect of low measurement accuracy of traditional detection method.

Description

Technical Field

[0001] This invention relates to the field of power measurement equipment technology, and in particular to a busbar measurement device based on the DC current measurement method. Background Technology

[0002] When installing or maintaining electrical equipment in a substation, it is necessary to conduct circuit resistance tests on the busbars, flexible busbar connections, clamps, and down conductors to ensure reliable connections. This is to prevent the circuit resistance from increasing due to poor contact or oxidation of the connection surfaces during operation after commissioning, which could lead to temperature rise at the connection points and even serious accidents such as equipment burnout over long-term operation. Therefore, it is necessary to conduct resistance tests on the busbar connection circuits using the DC current measurement method in conjunction with power outages.

[0003] Currently, conventional loop resistance testers are generally used to measure the loop resistance of busbars, flexible busbar connections, clamps, and down conductors on site. However, for busbars with diameters ranging from 60 to 280 mm, the large diameter means that the clamps used in conventional loop resistance testers cannot clamp the busbars for measurement.

[0004] Chinese patent document CN113851864A discloses a DC resistance measuring device for a flexible busbar connector and clamped lead-in node. It includes two semi-circular clamps connected by bolts, which can hold the surface of the busbar. A conventional loop resistance tester is used to connect the clamps to measure the busbar loop resistance. This technical solution requires disassembling the entire device into two semi-circular clamps, then fitting them onto the busbar and fixing them together to form a circular clamp, finally connecting to the loop resistance tester for measurement. The installation process is complex and cannot accommodate irregularly shaped conductor connections. Furthermore, traditional loop resistance testers are affected by lead resistance and clamp contact resistance, resulting in significant measurement errors and inaccurate readings that do not fully reflect the actual value. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a busbar measurement device based on DC current measurement method that is easy to use, reliable, efficient and widely applicable.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A busbar measuring device based on DC current measurement method includes a frame, on which a first clamp, a second clamp, and a clamping mechanism for driving the first clamp to move closer to or away from the second clamp are provided. The first clamp and the second clamp are both arc-shaped and arranged opposite to each other. Multiple contacts are provided on the side of the first clamp and the second clamp that are opposite to each other.

[0007] As a further improvement to the above technical solution: the contact is a toothed contact.

[0008] As a further improvement to the above technical solution: the material of the contact is beryllium copper alloy.

[0009] As a further improvement to the above technical solution: the frame is provided with a first clamp fixing seat and a second clamp fixing seat, the first clamp is elastically connected to the first clamp fixing seat, and the second clamp is elastically connected to the second clamp fixing seat.

[0010] As a further improvement to the above technical solution: the first clamp fixing seat and the first clamp, and the second clamp fixing seat and the second clamp are respectively connected by connecting columns. An elastic element is sleeved on the outer periphery of the connecting column. One end of the elastic element abuts against the first clamp fixing seat and the other end abuts against the first clamp; or, one end of the elastic element abuts against the second clamp fixing seat and the other end abuts against the second clamp.

[0011] As a further improvement to the above technical solution: the connecting column is made of insulating material, and insulating partitions are respectively provided between the first clamp fixing seat and the first clamp, and between the second clamp fixing seat and the second clamp.

[0012] As a further improvement to the above technical solution: the clamping mechanism includes a drive motor, a lead screw connected to the drive end of the drive motor, a sliding seat disposed on the lead screw, and a slide rail for guiding the sliding seat. The first clamp fixing seat is connected to the sliding seat, and the first clamp or the second clamp is provided with a pressure sensor for controlling the drive motor to stop.

[0013] As a further improvement to the above technical solution: the second clamp fixing base is fixed on the frame, and the second clamp is provided with voltage measurement terminals, current output terminals and voltage measurement probes.

[0014] As a further improvement to the above technical solution: the frame is provided with a battery compartment, and the battery compartment is provided with a storage battery for powering the clamping mechanism.

[0015] As a further improvement to the above technical solution: the busbar measuring device based on the DC current measurement method also includes a display module, which is hinged to the frame, and the frame is provided with a groove for accommodating the display module.

[0016] Compared with the prior art, the advantages of the present invention are as follows: This invention discloses a busbar measurement device based on DC current measurement. During measurement, a first clamp and a second clamp are placed on both sides of the busbar. A clamping mechanism then drives the first clamp towards the second clamp, thereby using the arc-shaped first and second clamps to clamp the busbar. This eliminates the need for manual bolt tightening, resulting in high automation, ease of use, high measurement efficiency, and adaptability to busbars of different diameters. Multiple contacts on the inner sides of the first and second clamps effectively pierce the alumina insulation film on the busbar surface under a set pressure, significantly reducing film resistance while avoiding scratches on the busbar itself, ensuring high reliability. The arc-shaped first and second clamps, along with the multiple inner contacts, can accommodate the detection of irregularly shaped conductors, ensuring sufficient contact area and overcoming the low accuracy of traditional detection methods for irregularly shaped conductors.

[0017] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the busbar measurement device based on the DC current measurement method of the present invention.

[0019] Figure 2 This is a schematic diagram of the main structure of the busbar measurement device based on the DC current measurement method of the present invention.

[0020] Figure 3 This is a three-dimensional structural diagram of the clamp in this invention.

[0021] Figure 4 This is a cross-sectional view of the fixture in this invention.

[0022] Figure 5 This is a three-dimensional structural diagram of the clamping mechanism in this invention.

[0023] Figure 6 This is a three-dimensional structural diagram of the measurement process of this invention.

[0024] Figure 7 This is a side view structural diagram of the measurement process of this invention.

[0025] The labels in the diagram represent: 1. Frame; 11. Groove; 12. Battery compartment; 2. First clamp; 3. Second clamp; 31. Voltage measurement terminal; 32. Current output terminal; 33. Voltage measurement probe; 4. Clamping mechanism; 41. Drive motor; 411. Clamping button; 412. Release button; 42. Lead screw; 43. Sliding seat; 44. Slide rail; 5. Contact; 61. First clamp fixing seat; 62. Second clamp fixing seat; 63. Connecting column; 64. Elastic element; 65. Insulating partition; 7. Display module. Detailed Implementation

[0026] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Figures 1 to 7 This invention illustrates an embodiment of the busbar measuring device based on the DC current measurement method of the present invention. The busbar measuring device of this embodiment includes a frame 1, on which a first clamp 2, a second clamp 3, and a clamping mechanism 4 for driving the first clamp 2 closer to or further away from the second clamp 3 are provided (see details). Figure 2 When the first clamp 2 on the left moves to the right, it can clamp the busbar; conversely, when the first clamp 2 moves to the left, it can loosen the busbar. The first clamp 2 and the second clamp 3 are both arc-shaped and arranged opposite each other. Multiple contacts 5 are provided on the side of the first clamp 2 and the second clamp 3 that are opposite each other (i.e., the inner side of the first clamp 2 and the second clamp 3).

[0031] In this embodiment, the busbar measuring device based on the DC current measurement method places the first clamp 2 and the second clamp 3 on both sides of the busbar during measurement. Then, the clamping mechanism 4 drives the first clamp 2 to move closer to the second clamp 3, thereby using the arc-shaped first clamp 2 and the second clamp 3 to clamp the busbar (specifically as follows). Figure 6 and Figure 7 As shown, it requires no manual tightening of bolts, is highly automated, easy to use, and has high measurement efficiency, and can adapt to busbars of different diameters. Multiple contacts 5 on the inner sides of the first clamp 2 and the second clamp 3 effectively pierce the alumina insulation film on the surface of the busbar under a set pressure, significantly reducing the film resistance while avoiding scratches on the busbar itself, ensuring high reliability. The arc-shaped first clamp 2 and the second clamp 3, together with the multiple contacts 5 on their inner sides, can adapt to the detection of irregularly shaped conductors, ensuring a large contact area with irregularly shaped conductors and overcoming the shortcomings of traditional detection methods in terms of low measurement accuracy for irregularly shaped conductors.

[0032] In a preferred embodiment, contact 5 is a toothed contact, which helps to increase the contact area with the busbar and facilitates piercing the aluminum oxide insulation film on the surface of the busbar.

[0033] In a preferred embodiment, the contact 5 is made of beryllium copper alloy. Beryllium copper alloy has the characteristics of high hardness and high conductivity, which makes it easy to pierce the alumina insulation film on the surface of the busbar, and at the same time helps to improve the accuracy of the measurement results.

[0034] Furthermore, in this embodiment, the frame 1 is provided with a first clamp fixing seat 61 and a second clamp fixing seat 62. The first clamp 2 is elastically connected to the first clamp fixing seat 61, and the second clamp 3 is elastically connected to the second clamp fixing seat 62. The first clamp 2 and the second clamp 3 can float relative to the first clamp fixing seat 61 and the second clamp fixing seat 62, which is beneficial for adapting to the detection of irregularly shaped conductors and ensuring that the contact 5 maintains good contact with the irregularly shaped conductor.

[0035] See details Figure 3 and Figure 4 In this embodiment, the first clamp fixing seat 61 and the first clamp 2, and the second clamp fixing seat 62 and the second clamp 3 are respectively connected by connecting posts 63. An elastic element 64 (preferably a coil spring, elastic rubber, etc.) is sleeved on the outer periphery of the connecting post 63. One end of the elastic element 64 abuts against the first clamp fixing seat 61, and the other end abuts against the first clamp 2; or, one end of the elastic element 64 abuts against the second clamp fixing seat 62, and the other end abuts against the second clamp 3. When the first clamp 2 and the second clamp 3 are subjected to force, they overcome the elastic force of the elastic element 64, thus allowing them to move relative to the first clamp fixing seat 61 and the second clamp fixing seat 62. This adapts to the detection of irregularly shaped conductors, resulting in a reasonable and effective structure. After the first clamp 2 is released, the first clamp 2 and the second clamp 3 automatically reset under the elastic force of the elastic element 64.

[0036] In a preferred embodiment, the connecting column 63 is made of insulating material, and insulating partitions 65 (such as epoxy insulating partitions) are provided between the first clamp fixing seat 61 and the first clamp 2, and between the second clamp fixing seat 62 and the second clamp 3, respectively. This can achieve insulation isolation between the first clamp 2, the second clamp 3 and the first clamp fixing seat 61, the second clamp fixing seat 62, and ensure the safety of the testing process.

[0037] See details Figure 5 In this embodiment, the clamping mechanism 4 includes a drive motor 41, a lead screw 42 connected to the drive end of the drive motor 41, a sliding seat 43 mounted on the lead screw 42, and a slide rail 44 for guiding the sliding seat 43. A first clamp fixing seat 61 is connected to the sliding seat 43. A pressure sensor (not shown in the figure) is provided on the first clamp 2 or the second clamp 3 to control the stop of the drive motor 41. During operation, the drive motor 41 drives the lead screw 42 to rotate. The sliding seat 43 on the lead screw 42 moves relative to the lead screw 42 under the guidance of the slide rail 44. The sliding seat 43 drives the first clamp fixing seat 61 and the first clamp 2 on it to move, thereby clamping or releasing the busbar. When the pressure sensor detects that the pressure reaches the set value, the drive motor 41 stops, avoiding over-clamping that could damage the device or scratch the busbar, achieving closed-loop control. The structure is reasonable and effective.

[0038] Preferably, in this embodiment, the drive motor 41 is a DC 12V servo motor, the lead screw 42 is a T-type lead screw, and a planetary gear reducer (speed ratio 1:50) is provided between the DC servo motor and the T-type lead screw. After mechanical calculation and experimental calibration, the clamping mechanism 4 can output a constant clamping force of 300-500N, ensuring the consistency of the contact state between multiple measurements, thereby ensuring the repeatability and reliability of the measurement data.

[0039] Furthermore, in this embodiment, the second clamp fixing base 62 is fixed to the frame 1, and the second clamp 3 is provided with a voltage measuring terminal 31 (U + ), current output terminal 32 (I +The device includes a voltage measurement probe 33 and a standard four-wire measurement principle. A high-stability constant current source injects a standard current I, and a high-precision differential amplifier measures the voltage drop V across the resistor under test. The measured resistance Rx is calculated using the formula: Rx = V / I, fundamentally eliminating the influence of the test leads and clamp contact resistance on the measurement results, and directly displaying the micro-ohm resistance value on the display module 7. The integrated clamping and measurement function design makes the device lighter and more convenient to use. The second clamp fixing seat 62 and the second clamp 3 remain fixed during measurement, avoiding dragging the cable connected to the second clamp 3. Alternatively, in other embodiments, the screw 42 can have opposite helical directions at both ends and sliding seats 43 can be provided respectively, with the first clamp fixing seat 61 and the second clamp fixing seat 62 moving synchronously in opposite directions, thus moving closer or further apart.

[0040] See details Figure 2 In this embodiment, the frame 1 is provided with a battery compartment 12, which contains a battery (not shown in the figure, such as a lithium polymer battery pack, ensuring that the device can work continuously for no less than 8 hours) for powering the clamping mechanism 4 (specifically, for powering the drive motor 41 in the clamping mechanism 4, and preferably also for powering the display module 7). Using a battery to power the clamping mechanism 4 avoids the drawbacks of relying on 220V AC power, which poses a risk of electric shock, and the potential for accidents caused by dragging the power cord during high-altitude operations.

[0041] See details Figure 1 and Figure 2 In this embodiment, the busbar measuring device based on the DC current measurement method also includes a display module 7, which can be used to display information such as pressure, current, voltage, and battery charge during the measurement process. The display module 7 is hinged to the frame 1, and the frame 1 is provided with a groove 11 for accommodating the display module 7 (the groove 11 is specifically located on the outer wall of the battery compartment 12). During operation, the display module 7 is rotated open, making it convenient for operators to view relevant information. When measurement is not required, the display module 7 is stored in the groove 11, resulting in a compact structure and good portability.

[0042] See details Figure 6 and Figure 7 The measurement operation method of the busbar measurement device based on DC current measurement method of the present invention is as follows: S1. Preparatory work before operation: Inspect the on-site work environment, check the diameter of the busbar, check whether the work site meets the requirements of the aerial work platform and other climbing equipment, check whether the types and quantities of tools and equipment required for the operation are complete and qualified, and set up safety fences at the work site.

[0043] S2. Pre-operation "Three-Step Handover": The work supervisor clarifies the task, safety measures, and technical requirements to the team members. This includes explaining the work tasks, content, personnel assignments, and technical procedures; explaining safety measures, including on-site safety protocols and precautions for high-risk areas; and explaining technical requirements, emphasizing risk control measures and operating procedures to ensure that workers understand their safety responsibilities and risk management methods.

[0044] S3. Workers climbing: Two workers wearing personal double-control double-safety belts, carrying the busbar measuring device based on the DC current measurement method of this invention and personal tools such as wrenches, climb into the truck bed of the aerial work vehicle or lifting platform.

[0045] S4. Measurement of busbar loop resistance: #1 The operator connects one end of the test lead to the terminal of the device of the present invention and the other end to the busbar clamp. #2 The operator places the second clamp 3 against the busbar and presses the clamping button 411 to move the first clamp 2 on the other side in the clamping direction until the clamp is clamped, and then performs the loop resistance measurement.

[0046] S5. Remove the device of the present invention: After the measurement is completed, operator #1 removes one end of the test line from the busbar clamp, and operator #2 presses the release button 412 to move the first clamp 2 in the release direction. After it is completely released, remove the device of the present invention from the busbar.

[0047] S6. Evacuation of workers to the ground: After two workers check that there are no objects left at the working part of the busbar, the operator of the aerial work vehicle or lifting platform vehicle lowers the boom to the ground, and the workers evacuate from the bucket to the ground.

[0048] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A busbar measuring device based on DC current measurement method, characterized in that: Includes a frame (1), on which a first clamp (2), a second clamp (3) and a clamping mechanism (4) for driving the first clamp (2) to approach or move away from the second clamp (3) are provided. The first clamp (2) and the second clamp (3) are both arc-shaped and arranged opposite to each other. The first clamp (2) and the second clamp (3) are each provided with multiple contacts (5) on the side opposite to each other.

2. The busbar measuring device based on DC current measurement method according to claim 1, characterized in that: The contact (5) is a toothed contact.

3. The busbar measuring device based on DC current measurement method according to claim 1, characterized in that: The contact (5) is made of beryllium copper alloy.

4. The busbar measuring device based on DC current measurement method according to any one of claims 1 to 3, characterized in that: The frame (1) is provided with a first clamp fixing seat (61) and a second clamp fixing seat (62). The first clamp (2) is elastically connected to the first clamp fixing seat (61), and the second clamp (3) is elastically connected to the second clamp fixing seat (62).

5. The busbar measuring device based on DC current measurement method according to claim 4, characterized in that: The first clamp fixing seat (61) and the first clamp (2) are connected by connecting posts (63), and the second clamp fixing seat (62) and the second clamp (3) are connected by connecting posts (63). The connecting posts (63) are fitted with elastic members (64) on their outer periphery. One end of the elastic member (64) abuts against the first clamp fixing seat (61) and the other end abuts against the first clamp (2); or, one end of the elastic member (64) abuts against the second clamp fixing seat (62) and the other end abuts against the second clamp (3).

6. The busbar measuring device based on DC current measurement method according to claim 5, characterized in that: The connecting column (63) is made of insulating material, and insulating partitions (65) are provided between the first clamp fixing seat (61) and the first clamp (2) and between the second clamp fixing seat (62) and the second clamp (3).

7. The busbar measuring device based on DC current measurement method according to claim 4, characterized in that: The clamping mechanism (4) includes a drive motor (41), a lead screw (42) connected to the drive end of the drive motor (41), a sliding seat (43) provided on the lead screw (42), and a slide rail (44) for guiding the sliding seat (43). The first clamp fixing seat (61) is connected to the sliding seat (43). The first clamp (2) or the second clamp (3) is provided with a pressure sensor for controlling the drive motor (41) to stop.

8. The busbar measuring device based on DC current measurement method according to claim 7, characterized in that: The second clamp fixing seat (62) is fixed on the frame (1), and the second clamp (3) is provided with voltage measurement terminal (31), current output terminal (32) and voltage measurement probe (33).

9. The busbar measuring device based on DC current measurement method according to any one of claims 1 to 3, characterized in that: The frame (1) is provided with a battery compartment (12), and the battery compartment (12) contains a storage battery for supplying power to the clamping mechanism (4).

10. The busbar measuring device based on DC current measurement method according to any one of claims 1 to 3, characterized in that: It also includes a display module (7), which is hinged to the frame (1), and the frame (1) is provided with a groove (11) for accommodating the display module (7).

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