Novel clamp for automatic detection of power transformer

Abstract

The utility model discloses a novel clamp used for automatic detection of a power transformer, comprising a U-shaped metal plate, one end of the U-shaped metal plate is provided with an aviation socket assembly, the inner side of the U-shaped metal plate is provided with a current copper block at one end of the aviation socket assembly, and the other end of the U-shaped metal plate is provided with a puller screw. The jacking screw is of a wide and narrow structure, penetrates through the U-shaped metal plate and corresponds to the current copper block in position, the end, close to the current copper block, of the jacking screw is a narrow end, the narrow end of the jacking screw is movably connected with a jacking nut through a micro-motion device, and the jacking nut is matched with the current copper block to be used for clamping the transformer bushing. Fine adjustment of the horizontal angle of the puller nut can be achieved through the micro-motion device so as to adapt to the complex and uneven surface of the transformer bushing, and therefore the power transformer branching clamp can be installed more stably and is not prone to loosening even under the special conditions of large current and the like.

Description

Technical Field

[0001] This utility model relates to the field of power equipment measurement technology, and in particular to a novel fixture for automated testing of power transformers. Background Technology

[0002] Factory testing, power outage testing, and preventative testing of power transformers involve multiple testing items such as insulation resistance, DC resistance, dielectric loss, and short-circuit impedance. Some testing items require high voltage or high current, while others can be performed under low voltage or low current. To reduce the number of wiring operations, lower the probability of wiring errors, and improve testing speed and efficiency, Chinese invention patent CN85301298B discloses an automated testing cable distribution fixture for power transformers. This fixture uses three three-core aviation sockets and one twelve-core aviation socket to connect and distribute various connecting cables in one go. The aviation sockets serve as electrical... Line connection components, when used stably and reliably, can ensure high efficiency and accuracy in testing. However, in existing technologies, the branch clamp is fixed to the transformer bushing with a tightening nut. In reality, the surface of the transformer bushing is usually uneven, and the tightening nut fixing surface of the branch clamp cannot be adjusted for fine-tuning, making it unsuitable for the complex plane of the transformer bushing. As a result, the branch clamp cannot be properly fixed to the bushing surface, and it will loosen if there is excessive current or other external factors. Therefore, in order to change the above situation, it is necessary to design a new type of clamp that can improve the stability of the branch clamp installation. Utility Model Content

[0003] This utility model patent aims to address the shortcomings of existing technologies by providing a novel clamp for automated testing of power transformers, thereby solving the problem that clamps in existing technologies are prone to loosening under special conditions such as high current.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a novel clamp for automated testing of power transformers, comprising a U-shaped metal plate, an aviation socket assembly at one end of the U-shaped metal plate, a current copper block at one end of the aviation socket assembly on the inner side of the U-shaped metal plate, and a tightening screw at the other end of the U-shaped metal plate. The tightening screw has a wide-narrow structure, passes through the U-shaped metal plate and corresponds to the position of the current copper block. The end of the tightening screw near the current copper block is set as the narrow end, and the narrow end of the tightening screw is movably connected to a tightening nut through a micro-motion device. The tightening nut cooperates with the current copper block to clamp the transformer bushing.

[0005] Preferably, the micro-motion device includes a nut retaining ring sleeved on the outer periphery of the tightening screw, and a support rod is provided at the top and bottom positions of the nut retaining ring near the tightening nut. One end of the tightening nut is hinged to the support rod.

[0006] Preferably, the tightening nut is cylindrical, with a hemispherical inner wall inside. The narrow end of the tightening screw has a hemispherical dome that penetrates the nut retaining ring and contacts the inner wall of the tightening nut. A nut limiting rod is symmetrically embedded on the outer periphery of the tightening screw near the tightening nut. One end of the nut limiting rod has a hemispherical dome that contacts the inner wall of the tightening nut. A cavity is formed between the top of the nut limiting rod and the nut retaining ring for the tightening nut to rotate.

[0007] Preferably, an insulating plate is provided between the current copper block and the U-shaped metal plate.

[0008] Preferably, a screw wrench is provided at the end of the tightening screw away from the current copper block.

[0009] Preferably, the aviation socket assembly includes a twelve-pin aviation socket and several four-pin aviation sockets disposed on a U-shaped metal plate.

[0010] The beneficial effects of this utility model are:

[0011] This application uses a micro-motion device to finely adjust the horizontal angle of the tightening nut, adapting to the complex and uneven surface of the transformer bushing, thereby making the installation of the power transformer branch clamp more stable and less prone to loosening even under special conditions such as high current. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0014] In the diagram: 1. U-shaped metal plate; 2. Aviation socket assembly; 3. Current copper block; 4. Screw wrench; 5. Tightening nut; 6. Tightening screw; 7. Nut limit rod; 8. Nut retaining ring; 9. Support rod; 10. Insulating plate. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] like Figure 1As shown, a novel clamp for automated testing of power transformers includes a U-shaped metal plate 1. An aviation socket assembly 2 is mounted on one end of the U-shaped metal plate 1. A current copper block 3 is mounted on the inner side of the U-shaped metal plate 1 at one end of the aviation socket assembly 2. A tightening screw 6 is mounted on the other end of the U-shaped metal plate 1. The tightening screw 6 has a wide-narrow structure, passing through the U-shaped metal plate 1 and corresponding to the position of the current copper block 3. The end of the tightening screw 6 closest to the current copper block 3 is designated as the narrow end. The narrow end of the tightening screw 6 is movably connected to a tightening nut 5 via a micro-motion device. The tightening nut 5 cooperates with the current copper block 3 to clamp the transformer bushing. In this embodiment, a micro-motion device is installed on the tightening screw 6 to adapt to various complex surfaces of the transformer bushing. During use, the micro-motion device drives the tightening nut to make fine adjustments in the horizontal direction via a hinge, resulting in a more stable connection with the transformer bushing.

[0017] Preferably, the micro-motion device includes a nut retaining ring 8 sleeved around the outer periphery of the tightening screw 6. Support rods 9 are provided at the top and bottom positions of the nut retaining ring 8 near the tightening nut 5. One end of the tightening nut 5 is hinged to the support rod 9, as shown in the attached figure. Figure 2 As shown, in this embodiment, there is a gap between the upper and lower ends of the tightening nut 5 and the tightening screw 6. The tightening nut 5 can be finely adjusted left and right along the nut fixing ring 8 to adapt to various complex surfaces of the transformer bushing. This micro-motion device can not only be finely adjusted through the nut fixing ring 8, but also has a spherical block set at the end of the tightening screw 6 near the current copper block 3, and a ball groove is opened on the tightening nut 5. The spherical block and the ball groove cooperate to form a ball hinge structure. Through the ball hinge structure, the angle of the tightening nut 5 can also be adjusted during use to facilitate clamping various transformer bushings. Similarly, the tightening nut 5 can also be hinged and fixed by a single insulating material. The angle of the tightening nut 5 can be adjusted to facilitate stable clamping of the transformer bushing during use.

[0018] Preferably, the tightening nut 5 is cylindrical, with a hemispherical inner wall inside. The narrow end of the tightening screw 6, with a hemispherical dome, penetrates the nut fixing ring 8 and contacts the inner wall of the tightening nut 5. Nut limiting rods 7 are symmetrically embedded on the outer periphery of the tightening screw 6 near the tightening nut 5. One end of the nut limiting rod 7, with a hemispherical dome, contacts the inner wall of the tightening nut 5. A cavity is formed between the top of the nut limiting rod 7 and the nut fixing ring 8 for the tightening nut 5 to rotate. In this embodiment, the nut fixing ring 8 is circular and fixedly connected to the tightening screw 6. Two support rods 9 are provided on the side of the nut fixing ring 8 near the tightening nut 5 for hinged connection of the upper and lower ends of the tightening nut 5. In this way, the tightening nut 5 can achieve fine left and right adjustment rotation through the hinged fulcrum.

[0019] Preferably, the micro-motion device includes, as described above, an insulating plate 10 is provided between the current copper block 3 and the U-shaped metal plate 1, the insulating plate preventing the current of the current copper block 3 from flowing through the U-shaped metal plate 1.

[0020] Preferably, a screw wrench 4 is provided at the end of the tightening screw 6 away from the current copper block 3. The wrench 4 is used to adjust the position of the tightening screw 6. When in use, the movement of the tightening screw 6 is driven by turning the screw wrench 4.

[0021] Preferably, the aviation socket assembly 2 includes a twelve-pin aviation socket and several four-pin aviation sockets disposed on the U-shaped metal plate 1. In this embodiment, the aviation socket assembly 2 preferably has one set of twelve-pin aviation plugs and three sets of three-pin aviation plugs. Several shielding wires, voltage wires and current wires of the twelve-pin aviation socket are connected to the shielding wires, voltage wires and current wires inside each four-pin aviation socket through the conductive medium inside the U-shaped metal plate 1.

[0022] The specific working method of this application is as follows: First, the aviation plug is inserted into the aviation socket assembly 2. The aviation socket assembly 2 is connected to the shielding wire, voltage wire, and current wire inside each four-core aviation socket through the internal conductive medium, and is also connected to the tightening nut 5 and the conductive copper block 3. When fixing the transformer branch clamp to the transformer bushing, first unscrew the tightening screw 9, and then contact the tightening nut 5 with the transformer bushing. The tightening nut 5 cooperates with the micro-motion device to make fine-tuning of the angle of the tightening nut 5. When the tightening nut 5 moves left and right, the semi-circular inner wall of the tightening nut 5 contacts the limit rod 7, which is the maximum distance of the horizontal angle fine-tuning of the tightening nut 5. In summary, the tightening nut 5 can realize the horizontal angle fine-tuning to adapt to the complex and uneven surface of the transformer bushing, so as to make the installation of the power transformer branch clamp more stable and less prone to loosening even under special conditions such as high current.

[0023] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A novel fixture for automated detection of power transformers, characterized by, The utility model provides a kind of aviation socket assembly, including U-shaped metal plate (1), the U-shaped metal plate (1) one end is provided with aviation socket assembly (2), the U-shaped metal plate (1) inside is located at aviation socket assembly (2) one end and is provided with current copper block (3), the U-shaped metal plate (1) other end is provided with top screw rod (6), the top screw rod (6) is wide and narrow structure, top screw rod (6) is passed through in U-shaped metal plate (1) and with current copper block (3) position corresponds, the top screw rod (6) is close to current copper block (3) one end and is provided as narrow end, the narrow end of top screw rod (6) is movably connected with top nut (5) by micro-motion device, the top nut (5) cooperates with current copper block (3) and is used for clamping transformer bushing.

2. A novel fixture for automated detection of power transformers as claimed in claim 1, wherein: The micro-motion device includes nut fixing ring (8) sleeved on the outer periphery of the top screw rod (6), support rods (9) are provided at the top and bottom positions of the side close to the top nut (5) of the nut fixing ring (8), and one end of the top nut (5) is hinged to the support rods (9).

3. A novel fixture for automated detection of power transformers as claimed in claim 2, wherein: The top nut (5) is in the shape of a cylinder, a hemispherical inner wall is formed in the inside of the top nut (5), the narrow end of the top screw rod (6) is in the shape of a hemispherical dome and penetrates the nut fixing ring (8) to contact the inner wall of the top nut (5), nut limiting rods (7) are symmetrically embedded in the outer periphery of the end of the top screw rod (6) close to the top nut (5), one end of the nut limiting rods (7) is in the shape of a hemispherical dome and contacts the inner wall of the top nut (5), and a cavity is formed between the top of the nut limiting rods (7) and the nut fixing ring (8) for the rotation of the top nut (5).

4. A novel fixture for automated detection of power transformers as claimed in claim 1, wherein: An insulating plate (10) is arranged between the current copper block (3) and the U-shaped metal plate (1).

5. A novel fixture for automated detection of power transformers as claimed in claim 1, wherein: A screw wrench (4) is arranged at the end of the top screw rod (6) away from the current copper block (3).

6. A novel fixture for automated detection of power transformers as claimed in claim 1, wherein: The aviation socket assembly (2) includes one twelve-core aviation socket and several four-core aviation sockets arranged on the U-shaped metal plate (1).

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