Adjustable transformer lead insulation testing device

Abstract

The utility model discloses an adjustable transformer lead wire insulation test device belongs to electrical equipment technical field, including the oil tank, the oil tank top is equipped with two test bushings, and two test bushings bottom extends into the oil tank, and the bottom of two test bushings is connected with the lead wire, and the lead wire below is equipped with height adjusting lever, and height adjusting lever vertical installation is in the inner bottom surface of oil tank, and height adjusting lever installs fixed part and electrode part on, and fixed part adjusts the position of electrode part on height adjusting lever, and electrode part is connected with the ground wire. Through the installation of fixed part on height adjusting lever, the change of electrode part on height adjusting lever at different heights is completed, the insulation distance between electrode part and lead wire is adjusted, the fixed distance of traditional test device is overcome, and the inconvenient adjustment is avoided, and the electrical performance verification under different insulation spacings is facilitated systematically, and the test efficiency and data acquisition ability are improved significantly.

Description

Technical Field

[0001] This utility model belongs to the field of electrical equipment technology, specifically an adjustable transformer lead insulation test device. Background Technology

[0002] In the field of power transformer technology, the design and verification of the insulation system are core aspects of ensuring the safe and stable operation of equipment. As a key conductive component connecting the windings to the external circuit, the insulation treatment of transformer leads directly affects the overall electrical performance and reliability of the equipment. Insulation distance, the shortest spatial interval between the lead and the grounding electrode or components at different potentials, is a crucial parameter for preventing breakdown caused by electric field concentration. With the rapid development of insulation material technology, such as the widespread application of new materials like high-performance insulating crepe paper and composite films, and advancements in manufacturing technologies like vacuum oil injection and curing processes, transformers are evolving towards miniaturization and high density. However, current insulation distance design still primarily relies on empirical values ​​summarized decades ago based on traditional insulation materials (such as ordinary cable paper and asphalt impregnation processes). These figures are overly conservative under modern technological conditions, resulting in excessive insulation margins. This over-design not only increases material costs and equipment size, hindering the development of compact and lightweight transformers, but also makes it difficult to achieve an optimal balance between economy and electrical safety.

[0003] To accurately determine the minimum safe insulation distance, extensive electrical testing is required to obtain key data such as breakdown characteristics and partial discharge initiation voltage under different insulation materials, sheath thicknesses, and electric field environments. Electrical testing typically includes power frequency withstand voltage and impulse voltage tests to simulate extreme conditions in actual operation. However, existing testing equipment generally suffers from inflexible adjustment of the test distance. Utility Model Content

[0004] To address the problems encountered during insulation testing, this invention provides an adjustable transformer lead insulation testing device.

[0005] This utility model is achieved through the following technical solution: An adjustable transformer lead insulation testing device includes an oil tank. Two test sleeves are provided on the top surface of the oil tank, with their bottoms extending into the oil tank. A lead wire is connected between the bottoms of the two test sleeves. A height adjustment rod is provided below the lead wire, vertically mounted on the inner bottom surface of the oil tank. A fixing component and an electrode are mounted on the height adjustment rod. The fixing component adjusts the position of the electrode on the height adjustment rod. A grounding wire is connected to the electrode.

[0006] By installing the fixing component on the height adjustment rod, the electrode components can be adjusted to different heights on the height adjustment rod, thereby adjusting the insulation distance between the electrode components and the lead wire. This effectively overcomes the shortcomings of traditional test devices, such as fixed distance and inconvenient adjustment. It facilitates the systematic verification of electrical performance under different insulation distances, and significantly improves test efficiency and data acquisition capabilities.

[0007] A further improvement of this invention is that the height adjustment rod is provided with two fixing members, and the electrode is fixed between the two fixing members. The two fixing members on one height adjustment rod clamp the electrode, and by adjusting the fixing members on the height adjustment rod, the height of the electrode can be adjusted, while improving the stability of fixing the electrode.

[0008] A further improvement of this invention is that two height adjustment rods are provided, and the electrode component is installed between the two height adjustment rods. Two fixing members on one height adjustment rod provide one point of support for the electrode component, and the two height adjustment rods and their fixing members cooperate to provide two points of support for the electrode component, thus improving stability.

[0009] A further improvement of this invention is that the height adjustment rod is an insulated screw, and the fixing member is an insulated nut that can be threaded onto the insulated screw. The two insulated nuts on the same insulated screw enable support and clamping of the electrode components, ensuring both the stability of the experiment and the insulation performance of the adjustment mechanism itself.

[0010] A further improvement of this invention is that a grounding stud is provided at the bottom of the oil tank. This grounding stud is located on one side of the height adjustment rod and connected to the grounding wire. The grounding stud provides a reliable and dedicated connection point for the grounding wire, ensuring that the ground electrode potential is stable at zero and achieving equipotential connection with the oil tank casing. This ensures the safety of the test personnel and avoids interference with the accuracy of test data caused by poor grounding.

[0011] A further improvement of this utility model is that the top of the oil tank is provided with a valve one communicating with the inside of the oil tank, and the bottom of the oil tank is provided with a valve two communicating with the inside of the oil tank. The top valve facilitates the vacuuming of the inside of the oil tank during the oil filling process, effectively eliminating air bubbles and ensuring that the insulating oil is fully impregnated; the bottom valve facilitates the quick and thorough draining of the insulating oil after the test.

[0012] A further improvement of this utility model is that the oil tank includes a tank body and a cover plate, and a sealing ring is provided between the cover plate and the tank body. The split tank body and cover plate structure facilitates the installation, maintenance and replacement of internal components; the sealing ring ensures the airtightness of the oil tank, meets the requirements of vacuum oil filling process for container airtightness, and provides a stable and reliable insulating environment for the test.

[0013] A further improvement of this utility model is that the aforementioned housing and cover are each provided with ear plates, and a locking element is connected to both corresponding ear plates. Through the cooperation of the ear plates and the locking element, the housing and cover are quickly locked and separated, which not only ensures the clamping force required for sealing, but also greatly improves the convenience of opening and closing operations, facilitating preparation before the test and cleaning work after the test.

[0014] A further improvement of this invention is that the aforementioned electrode components are angle steel or channel steel. The angle steel, with its pointed and upward-facing structure, can be used to simulate the insulation resistance of the lead wire to the electric field concentration point, while the channel steel, with its downward-facing planar structure, can simulate the insulation characteristics of the lead wire to a large grounding plane. The replaceable design of the electrode components allows a single device to easily conduct tests on various typical electric field distributions, expanding the verification range and application scenarios of the device.

[0015] As can be seen from the above technical solution, the beneficial effects of this utility model are: by installing the fixing component on the height adjustment rod, the electrode component can be adjusted to different heights on the height adjustment rod, thereby realizing the adjustment of the insulation distance between the electrode component and the lead wire. This effectively overcomes the shortcomings of traditional test devices, such as fixed distance and inconvenient adjustment, and facilitates the systematic verification of electrical performance under different insulation distances, significantly improving test efficiency and data acquisition capabilities. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model.

[0018] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present utility model.

[0019] In the attached diagram: 1. Oil tank; 11. Box body; 12. Cover plate; 13. Ear plate; 14. Locking component; 2. Test sleeve; 21. Connecting seat; 3. Lead wire; 4. Angle steel; 5. Height adjustment rod; 51. Fixing component; 6. Grounding stud; 7. Grounding wire; 8. Valve 1; 9. Valve 2; 10. Channel steel. Detailed Implementation

[0020] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0021] Example 1: like Figure 1 As shown, this utility model discloses an adjustable transformer lead insulation testing device, including a metal oil tank 1. The oil tank 1 includes a tank body 11 and a cover plate 12. The tank body 11 is used to hold the oil required for the test, and a sealing ring is provided between the cover plate 12 and the tank body 11. The split structure of the tank body 11 and the cover plate 12 facilitates the installation, maintenance, and replacement of internal components. The sealing ring ensures the airtightness of the oil tank 1, meeting the airtightness requirements of the vacuum oil filling process, and providing a stable and reliable insulation environment for the test. The tank body 11 and the cover plate 12 are respectively provided with ear plates 13, and two corresponding ear plates 13 are connected to a locking element 14. Through the cooperation of the ear plates 13 and the locking element 14, the rapid locking and separation between the tank body 11 and the cover plate 12 is realized, which not only ensures the clamping force required for sealing, but also greatly improves the convenience of opening and closing operations, facilitating pre-test preparation and post-test cleaning.

[0022] Two test sleeves 2 are provided on the top surface of the oil tank 1, with the bottoms of the two test sleeves 2 extending into the oil tank 1. Specifically, two connecting seats 21 are provided on the cover plate 12, which allow the test sleeves 2 to pass through the cover plate 12 and fix the test sleeves 2. A lead wire 3 is connected between the bottoms of the two test sleeves 2, and a height adjustment rod 5 is provided below the lead wire 3. The height adjustment rod 5 is vertically installed on the inner bottom surface of the oil tank 1, and a fixing component 51 and an electrode component are installed on the height adjustment rod 5. The fixing component 51 adjusts the position of the electrode component on the height adjustment rod 5. A grounding wire 7 is connected to the electrode component.

[0023] The height adjustment rod 5 is provided with two fixing members 51, and the electrode is fixed between the two fixing members 51. The two fixing members 51 on the height adjustment rod 5 clamp the electrode, and the height of the electrode can be adjusted by adjusting the fixing members on the height adjustment rod 5, thereby improving the stability of fixing the electrode.

[0024] Two height adjustment rods 5 are provided, and the electrode component is installed between the two height adjustment rods 5. Two fixing parts 51 on one height adjustment rod 5 provide one support for the electrode component, and the two height adjustment rods 5 and their fixing parts 51 cooperate to provide two supports for the electrode component, thereby improving stability.

[0025] The height adjustment rod 5 is an insulated screw, and the fixing member 51 is an insulated nut that can be threaded onto the insulated screw. The two insulated nuts on the same insulated screw can support and tighten the electrode, ensuring both the stability of the test and the insulation performance of the adjustment mechanism itself.

[0026] Specifically, the two insulating nuts on the same insulating screw can be adjusted to clamp the electrode; alternatively, holes can be drilled in the electrode beforehand so that it can be inserted through the insulating screw.

[0027] The electrode component is angle steel 4.

[0028] When selecting angle steel 4, the outer corner of angle steel 4 should face the lead wire 3.

[0029] The angle steel 4, with its sharp, upward-facing structure, can be used to simulate the insulation resistance of the lead 3 to the electric field concentration point, while the channel steel 10, with its downward-facing planar structure, can simulate the insulation characteristics of the lead 3 to a large grounding plane. The replaceable design of the electrode components allows a single device to easily conduct tests on various typical electric field distributions, expanding the verification scope and application scenarios of the device.

[0030] The bottom of the oil tank 1 is equipped with a grounding stud 6, which is located on one side of the height adjustment rod 5 and connected to the grounding wire 7. The grounding stud 6 provides a reliable and dedicated connection point for the grounding wire 7, ensuring that the ground electrode potential is stable at zero and that it is equipotentially connected to the outer shell of the oil tank 1. This ensures the safety of the test personnel and avoids interference with the accuracy of the test data caused by poor grounding.

[0031] The oil tank 1 has a valve 8 at the top that communicates with the interior of the tank, and a valve 9 at the bottom that also communicates with the interior of the tank. The top valve facilitates the evacuation of the tank during the oil filling process, effectively eliminating air bubbles and ensuring thorough impregnation of the insulating oil; the bottom valve facilitates the rapid and complete drainage of the insulating oil after the test. Valve 8 is located on the cover plate 12, and valve 9 is located on the housing 11.

[0032] Example 2: like Figure 2 As shown, the electrode is a channel steel 10.

[0033] When selecting channel steel 10, the flat surface of channel steel 10 should face the lead wire 3.

[0034] The working principle of this device is as follows: First, the insulating component to be tested is placed outside the lead wire 3. Appropriate electrodes are selected according to the test requirements. If a concentrated electric field effect needs to be simulated, angle steel 4 is selected and its outer corner faces the lead wire 3. If a uniform electric field needs to be simulated, channel steel 10 is selected and its flat surface faces the lead wire 3. The selected electrodes are then inserted through their mounting holes onto two insulating screws. The height of the electrodes can be precisely adjusted by tightening the upper and lower insulating nuts, and the double-nut structure reliably locks them at the required height, thus achieving precise and flexible adjustment of the insulation distance between the lead wire 3 and the electrodes. After the electrodes are installed, one end of the grounding wire 7 is connected to the electrodes, and the other end is connected to the grounding stud 6 located at the bottom of the housing 11, forming a reliable grounding circuit.

[0035] In use, first open the device through the locking piece 14 between the cover plate 12 and the housing 11, and place the adjusted electrode system inside the housing 11. Close the cover plate 12 and tighten the sealing ring through the locking piece 14 on the ear plate 13 to ensure the oil tank 1 is sealed. Then, connect the vacuum equipment through the valve 8 on the cover plate 12 to evacuate the oil tank 1. After reaching the required vacuum level, inject insulating oil to complete the vacuum oil injection process. The test voltage is applied to the lead wire 3 through the two test sleeves 2. The appropriate sleeve specifications can be replaced according to different voltage level requirements. At this time, the electric field required for the test is formed between the lead wire 3 and the grounding electrode, and electrical performance tests such as power frequency withstand voltage and partial discharge can be performed. By adjusting the electrode at different heights, key data such as breakdown voltage and discharge quantity under different insulation distances can be obtained systematically. After the test, drain the insulating oil through the valve 9 at the bottom of the housing 11, and loosen the locking piece 14 to open the oil tank 1, which facilitates the replacement of electrode or adjustment of configuration for the next set of tests. The entire device, through its adjustable electrode structure and modular design, enables efficient verification under various operating conditions, providing a reliable testing method for optimizing transformer insulation parameters.

[0036] This utility model discloses an adjustable transformer lead insulation test device. By installing a fixing component on a height adjustment rod, the electrode component can be adjusted to different heights on the height adjustment rod, thereby adjusting the insulation distance between the electrode component and the lead. This effectively overcomes the shortcomings of traditional test devices, such as fixed distance and inconvenient adjustment. It facilitates the systematic verification of electrical performance under different insulation distances and significantly improves test efficiency and data acquisition capabilities.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An adjustable transformer lead insulation test device comprising an oil tank (1), the top surface of the oil tank (1) is provided with two test bushings (2), characterized in that, The bottoms of the two test sleeves (2) extend into the oil tank (1); a lead wire (3) is connected between the bottoms of the two test sleeves (2), and a height adjustment rod (5) is provided below the lead wire (3). The height adjustment rod (5) is vertically installed on the inner bottom surface of the oil tank (1), and a fixing part (51) and an electrode are installed on the height adjustment rod (5). The fixing part (51) adjusts the position of the electrode on the height adjustment rod (5); a grounding wire (7) is connected to the electrode.

2. The adjustable transformer lead insulation testing device according to claim 1, characterized in that, The height adjustment rod (5) is provided with two fixing parts (51), and the electrode is fixed between the two fixing parts (51).

3. An adjustable transformer lead insulation testing device according to claim 2, wherein, Two height adjustment rods (5) are provided, and the electrode is installed between the two height adjustment rods (5).

4. An adjustable transformer lead insulation testing device according to claim 3, wherein, The height adjustment rod (5) is an insulated screw, and the fixing member (51) is an insulated nut that can be threaded onto the insulated screw.

5. An adjustable transformer lead insulation testing device as defined in claim 1, wherein, The bottom of the oil tank (1) is also provided with a grounding stud (6), which is located on one side of the height adjustment rod (5) and connected to the grounding wire (7).

6. An adjustable transformer lead insulation testing device according to claim 1, wherein, The top of the oil tank (1) is provided with a valve 1 (8) that communicates with the inside of the oil tank (1), and the bottom of the oil tank (1) is provided with a valve 2 (9) that communicates with the inside of the oil tank (1).

7. An adjustable transformer lead insulation testing device according to claim 6, wherein, The oil tank (1) includes a tank body (11) and a cover plate (12), and a sealing ring is provided between the cover plate (12) and the tank body (11).

8. An adjustable transformer lead insulation testing device according to claim 7, wherein, The housing (11) and the cover plate (12) are respectively provided with ear plates (13), and the two corresponding ear plates (13) are connected together with locking parts (14).

9. An adjustable transformer lead insulation testing device according to any one of claims 1 to 8, wherein, The electrode is an angle steel (4) or a channel steel (10).

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