Protective device for high-voltage bushing insulation test and test equipment

Abstract

The utility model relates to the technical field of high-voltage bushing insulation tests, in particular to a protective device and test equipment for high-voltage bushing insulation tests, which comprises an insulator, an insulation frame and a protective structure, the insulation frame and the protective structure are sequentially connected with the insulator, and the protective structure or the insulation frame is connected with a fixing structure. And a test object is arranged in the protection structure. The arrangement of the insulator realizes the mechanical hoisting of structures such as an insulating frame and the like, and realizes the electrical insulation of a test sample, so as to achieve the purposes of isolating a conductive path between the test sample and hoisting equipment and ensuring the safety and stability in the test process; through the arrangement of the protection structure, the test object is effectively protected, and meanwhile, the test condition and the operation condition are ensured to be consistent to the maximum extent, so that the reliability and the accuracy of the test result are ensured; the problem of inaccurate test results caused by improper protection in the high-voltage bushing insulation test process in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage bushing insulation testing, specifically to a protective device and test equipment for high-voltage bushing insulation testing, in particular to a protective device and test equipment for insulation testing of high-voltage AC gas-filled porcelain bushings and uneven rain DC voltage testing of wall bushings for DC systems. Background Art

[0002] Gas-filled porcelain bushings are insulating bushings whose inner cavity is filled with insulating gas (typically SF6). High-voltage AC gas-filled porcelain bushings are extremely common in AC power systems. When conducting a series of insulation tests on these bushings in accordance with the standard GB / T4109, "Insulating Bushings for AC Voltages Above 1000V," laboratories are aware of potential insulation defects in these bushings, which could result in an explosion. The scattered porcelain fragments could cause significant damage to personnel and equipment.

[0003] A DC wall bushing is installed on the wall of a building (such as a converter valve hall) to withstand DC voltages with minimal AC voltage waveforms. It is also widely used in DC power systems. In accordance with the standard GB / T22674, "Bushings for DC Systems," the laboratory conducted a special insulation test for horizontally installed DC wall bushings, known as the uneven rain DC voltage test. Because the outdoor portion of the bushing is subjected to DC voltage under rain conditions, while the indoor portion is subject to DC voltage under dry conditions, effective isolation between the wet and dry areas of the bushing is required to meet the test requirements. Failure to properly isolate the wet and dry areas during the test will invalidate the test results.

[0004] Conventional technology typically wraps a layer of insulating nylon mesh around the outer surface of high-voltage AC gas-filled porcelain bushings for safety during insulation testing. This method of protection not only fails to meet the test conditions for high-voltage AC gas-filled porcelain bushings, but also affects the insulation test results. Furthermore, it is not suitable for wet testing of high-voltage AC gas-filled porcelain bushings. First, a layer of insulating nylon mesh is wrapped around the surface of the high-voltage AC gas-filled porcelain bushing. The insulating nylon mesh is in close contact with the surface of the high-voltage AC gas-filled porcelain bushing, which is equivalent to the insulating nylon mesh being a part of the high-voltage AC gas-filled porcelain bushing. However, the high-voltage AC gas-filled porcelain bushing is not wrapped with the insulating nylon mesh during actual operation. As a result, the test conditions of the high-voltage AC gas-filled porcelain bushing during the insulation test are inconsistent with its operating conditions. Therefore, this protection method cannot meet the test conditions of the high-voltage AC gas-filled porcelain bushing insulation test. Second, the insulating nylon mesh used will become contaminated during long-term use. If it is wrapped around the surface of the high-voltage AC gas-filled porcelain bushing, it will affect the insulation strength of the high-voltage gas-filled porcelain bushing, causing flashover, thereby affecting the accuracy of the insulation test results. Third, the insulation test of the high-voltage AC gas-filled porcelain bushing includes a wet test. During the wet test, the high-voltage AC gas-filled porcelain bushing needs to be exposed to rain. Rain will cause the insulating nylon mesh to become damp, greatly reducing the insulation strength, making the wet test impossible.

[0005] When conducting uneven rain DC voltage tests on wall bushings used in DC systems, the position of the showerhead is typically adjusted to spray only the exposed area of ​​the bushing. This protection method not only affects the validity and accuracy of the test results, but also makes it difficult to adjust the showerhead position to spray only the exposed area of ​​the bushing. During the spraying process, the dry area of ​​the bushing will be affected to some extent by rain and fog, resulting in incomplete drying of the dry area. Therefore, the test conditions required for uneven rain DC voltage tests cannot be met, further affecting the validity and accuracy of the test results. Utility Model Content

[0006] Aiming at the problem of inaccurate test results caused by improper protection during the high-voltage bushing insulation test in the prior art, the utility model provides a protection device and test equipment for the high-voltage bushing insulation test.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] The utility model provides a protective device for high-voltage bushing insulation testing, comprising an insulator, wherein the insulator is connected to an insulation frame, a protective structure is suspended on the insulation frame; the insulation frame or the protective structure is connected to a fixed structure; and a test piece is installed inside the protective structure.

[0009] Furthermore, the protective structure is an explosion-proof net.

[0010] Preferably, the explosion-proof net is connected to the insulating frame through a plurality of explosion-proof net hooks arranged on the insulating frame along the circumferential direction.

[0011] Furthermore, the protective structure is a rainproof cloth.

[0012] Preferably, the rainproof cloth is connected to the insulating frame via a hanging wire provided on the insulating frame, and the hanging wire is fixed to the insulating frame via a dovetail screw.

[0013] Preferably, the rainproof cloth is provided with a rainproof cloth zipper, and the rainproof cloth zipper is provided with a sample installation hole.

[0014] Preferably, the fixing structure comprises a fixing rope connected to the bottom of the protective structure or to the insulating frame, and the free end of the fixing rope is connected to a fixing trolley.

[0015] Preferably, the insulator is connected to the insulating frame via a suspension rope.

[0016] Preferably, the insulator is a suspension insulator, and the length of the insulator is greater than or equal to 1.5 times the insulation distance of the test piece; or the insulator is an insulator of the same voltage level as the test piece.

[0017] A high-voltage bushing insulation test device comprises the above-mentioned protective device for high-voltage bushing insulation test.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The utility model discloses a protective device for high-voltage bushing insulation testing, comprising an insulator, wherein the insulator is connected to an insulation frame, and a protective structure is suspended on the insulation frame; a fixing structure is connected to the protective structure or the insulation frame for maintaining the stability of the protective structure and the insulation frame; and a test piece is installed inside the protective structure. The insulators enable mechanical lifting of structures such as insulating frames while also providing electrical insulation for high-voltage AC gas-filled porcelain bushings or DC wall bushings, thereby isolating the conductive path between the test specimen and the lifting equipment, ensuring safety and stability during testing. Furthermore, the protective structure effectively protects the high-voltage AC gas-filled porcelain bushings or DC wall bushings. In actual use, the protective structure can be replaced according to the type of test specimen. When protecting high-voltage AC gas-filled porcelain bushings, the protective structure does not contact the bushings, greatly aligning the test conditions with their operating conditions. This effectively protects the bushings and makes them more compatible with the test conditions for insulation testing. This results in more accurate test results and compatibility with wet conditions. When protecting DC systems with wall bushings, the system effectively isolates the rain and dry areas. Adjusting the rain position eliminates the need for adjusting the rain device, making operation simple and unaffected by rain or fog. This makes the system more compatible with the test conditions for uneven rain DC voltage tests, enhancing the effectiveness and accuracy of the test results.

[0020] The protective structure is an explosion-proof net. The setting of the explosion-proof net can effectively protect the four sides of the high-voltage AC gas-filled porcelain bushing during the high-voltage AC gas-filled porcelain bushing insulation test, and does not directly contact the surface of the high-voltage AC gas-filled porcelain bushing, which meets the test conditions of the high-voltage AC gas-filled porcelain bushing insulation test and improves the reliability of the test results.

[0021] The explosion-proof net is connected to the insulating frame through a plurality of explosion-proof net hooks arranged on the insulating frame along the circumferential direction. The arrangement of the explosion-proof net hooks can facilitate the hanging and disassembly of the explosion-proof net, further improving the convenience of the device.

[0022] The protective structure is a rainproof cloth. The setting of the rainproof cloth can effectively isolate the rained area and the dry area during the uneven rain DC voltage test of the DC system using the wall bushing, and avoid the uncontrollable influence of rain and fog on the test results. The rainproof cloth is simple to arrange and can be connected to the insulating frame through a lifting wire set on the insulating frame. The lifting wire is fixed to the insulating frame through a dovetail screw. By setting a rainproof cloth zipper on the rainproof cloth, the specimen mounting hole is set on the rainproof cloth zipper, and the size of the specimen mounting opening can be adjusted to be suitable for wall bushings for DC systems with different voltage levels. The structure is simple and the versatility is good. It is more in line with the test conditions of the uneven rain DC voltage test of the wall bushing for the DC system, and the reliability of the test results is guaranteed.

[0023] The fixing structure includes a fixing rope connected to the bottom of the insulating frame or the protective structure, and the free end of the fixing rope is connected to a fixing trolley. Through the arrangement of the fixing rope and the fixing trolley, the bottom of the protective structure can be fixed, thereby improving the stability of the protective structure. The fixing trolley can provide corresponding counterweights while facilitating adjustment of the tightness of the fixation, thereby improving versatility.

[0024] The insulator is a suspension insulator, and the length of the insulator is greater than or equal to 1.5 times the insulation distance of the test object; or the insulator is an insulator of the same voltage level as the test object, to ensure that the insulator plays an effective electrical insulation role to ensure the safety and stability of the test equipment.

[0025] The present invention also provides a high-voltage bushing insulation test device, including the above-mentioned high-voltage bushing insulation test protection device. The device has a longer service life, effectively protects test personnel, and provides reliable test results. It also has a simple structure, is easy to operate, and is easy to maintain and manage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a front view of a protective device for high-voltage bushing insulation testing in Example 1 of the utility model.

[0027] Figure 2 This is a left view of a protective device for high-voltage bushing insulation testing in Example 1 of the utility model.

[0028] Figure 3 This is a partial structural diagram of the insulating frame in Example 1 of the utility model.

[0029] Figure 4 This is a front view of a protective device for high-voltage bushing insulation testing in Example 2 of the present utility model.

[0030] Figure 5 This is a left view of a protective device for high-voltage bushing insulation testing in Example 2 of the present utility model.

[0031] Figure 6 This is a schematic diagram of the installation structure of a rainproof cloth in a protective device for high-voltage bushing insulation testing in Example 2 of the present utility model.

[0032] Figure 7 for Figure 6 Enlarged view of the AA point in the middle.

[0033] Figure 8 This is a structural diagram of the connection between the dovetail screw and the insulation frame.

[0034] Figure 9 The utility model is a schematic diagram of a fixed trolley in a protective device for high-voltage bushing insulation testing.

[0035] Among them, 1-insulator, 2-lifting rope, 3-insulating frame, 4-rainproof cloth, 5-explosion-proof net, 6-test piece, 7-test piece mounting hole, 8-rainproof zipper, 9-fixing rope, 10-fixing trolley, 11-O-ring, 12-explosion-proof net hook, 13-lifting wire. DETAILED DESCRIPTION

[0036] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0039] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear to indicate an orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the product of the present invention is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of the embodiments of the utility model, still need explaining, unless another explicit provision and limitation, if appearing term "arrangement", "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two elements inside the communication. For ordinary skilled in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model.

[0042] The utility model will be further explained in detail in combination with specific embodiments, which is the explanation of the utility model but not limitation.

[0043] The utility model discloses a kind of protective devices for high-voltage bushing insulation test, including insulator 1, the insulator 1 is connected with insulating frame 3, protective structure is hung on the insulating frame 3;The bottom of the protective structure is provided with fixed structure, for keeping the stability of protective structure;Test piece mounting hole 7 is provided in the protective structure and is used to install test piece 6.

[0044] Example 1

[0045] Referring to Figures 1 to 3 The utility model discloses a kind of protective devices for high-voltage bushing insulation test, including insulator 1, the insulator 1 is suspended insulator, the length of insulator 1 is greater than or equal to 1.5 times of test piece 6 insulation distance, or insulator 1 is with test piece 6 as same voltage grade insulator, to ensure effective electrical insulation;The insulator 1 is connected with insulating frame 3 by rope 2, the insulating frame 3 is provided with several explosion-proof net hooks 12 along the circumference, the explosion-proof net hook 12 is hung with explosion-proof net 5, the bottom of the explosion-proof net 5 is provided with fixed structure;When carrying out the insulation test of high-voltage alternating current inflatable porcelain bushing, the explosion-proof net 5 completely surrounds test piece 6, the test piece 6 is high-voltage alternating current inflatable porcelain bushing, the safety protection of test piece 6 is realized, explosion-proof net 5 does not contact with high-voltage alternating current inflatable porcelain bushing, can greatly make the test condition of high-voltage alternating current inflatable porcelain bushing and its operating condition consistent, so as to reach effective protection while, make it more comply with the test condition of high-voltage alternating current inflatable porcelain bushing insulation test, test result is more accurate and applicable to wet test. Preferably, the insulating frame 3 is provided with O ring 11, for connecting rope 2.

[0046] Example 2

[0047] Referring to Figures 4 to 8The utility model discloses a kind of protective devices for high voltage bushing insulation test, including insulator 1, the insulator 1 is suspension insulator, the length of insulator 1 is greater than or equal to 1.5 times of test product 6 insulation distance, or insulator 1 is with test product 6 is same voltage grade insulator, to ensure effective electrical insulation;The insulator 1 is connected with insulating frame 3 by rope 2, the insulating frame 3 is connected with fixed structure, for keeping the stability of insulating frame 3, prevent from influencing test result due to the sway of insulating frame 3, the insulating frame 3 is fixed with hoisting steel wire 13 by dovetail screw, the hoisting steel wire 13 is connected with rain cloth 4, the rain cloth 4 is provided with rain cloth zipper 8, the rain cloth zipper 8 is provided with test product mounting hole 7, when carrying out uneven rain direct current voltage test of wall bushing for direct current system, test product 6, i.e. wall bushing for direct current system is installed in test product mounting hole 7, when protecting wall bushing for direct current system, rain cloth 4 can effectively isolate rain area and dry area, without adjusting rain device position to control rain position, simple operation, and will not be affected by rain and mist, to be more in line with the requirement of test condition of uneven rain direct current voltage test, improve the effectiveness and accuracy of test result.

[0048] Reference Figure 9 Preferably, the fixed structure in embodiment 1 and embodiment 2 comprises fixed rope 9 connected with the bottom of protective structure, the free end of fixed rope 9 is connected with fixed trolley 10, fixed O-ring connected with fixed rope 9 is arranged above fixed trolley 10, and fixed wheels are arranged on the bottom of fixed trolley 10.

[0049] The utility model also provides a kind of high voltage bushing insulation test equipment, including the protective device for high voltage bushing insulation test described above.The equipment is longer in service life, and can effectively protect test personnel, and test result is reliable, and simple structure is convenient for operation, easy to maintain and manage.

[0050] In conclusion, the utility model provides a kind of protective device and test equipment for high voltage bushing insulation test, the device is effectively electrically insulated to test product 6 by using insulator to realize the mechanical hoisting of the rest components of the device, guarantee the safety and stability of test equipment, while realizing the safety protection during high voltage bushing insulation test by hanging protective structure below insulator, the consistency of test environment and operating condition is better, more in line with the required conditions of various tests, and test result is more reliable.

[0051] The above-mentioned is only the preferred embodiment of the utility model, and does not use to make any limitation to the technical scheme of the utility model, and those skilled in the art should understand that, without departing from the spirit and principle of the utility model, the technical scheme can be modified and replaced in several simple ways, and these modifications and replacements also all belong to the protection scope covered in the claims.

Claims

1. A protective device for high-voltage bushing insulation testing, characterized in that: The insulator (1) is connected to an insulating frame (3), a protective structure is suspended on the insulating frame (3), the insulating frame (3) or the protective structure is connected to a fixed structure, and a test piece (6) is installed inside the protective structure.

2. The protective device for high-voltage bushing insulation testing according to claim 1, characterized in that: The protective structure is an explosion-proof net (5).

3. The protective device for high-voltage bushing insulation testing according to claim 2, characterized in that: The explosion-proof net (5) is connected to the insulating frame (3) via a plurality of explosion-proof net hooks (12) arranged on the insulating frame (3) along the circumferential direction.

4. The protective device for high-voltage bushing insulation testing according to claim 1, characterized in that: The protective structure is a rainproof cloth (4).

5. The protective device for high-voltage bushing insulation testing according to claim 4, characterized in that: The rainproof cloth (4) is connected to the insulating frame (3) via a hanging wire (13) provided on the insulating frame (3), and the hanging wire (13) is fixed to the insulating frame (3) via a dovetail screw.

6. The protective device for high-voltage bushing insulation testing according to claim 5, characterized in that: The rainproof cloth (4) is provided with a rainproof cloth zipper (8), and the rainproof cloth zipper (8) is provided with a sample mounting hole (7).

7. The protective device for high-voltage bushing insulation testing according to claim 1, characterized in that: The fixing structure comprises a fixing rope (9) connected to the bottom of the protective structure or to the insulating frame (3), and a fixing trolley (10) is connected to the free end of the fixing rope (9).

8. The protective device for high-voltage bushing insulation testing according to any one of claims 1 to 7, characterized in that: The insulator (1) and the insulating frame (3) are connected via a suspension rope (2).

9. The protective device for high-voltage bushing insulation testing according to any one of claims 1 to 7, characterized in that: The insulator (1) is a suspension insulator, and the length of the insulator (1) is greater than or equal to 1.5 times the insulation distance of the test piece (6); or the insulator (1) is an insulator of the same voltage level as the test piece (6).

10. A high voltage bushing insulation test device, characterized in that: The invention comprises the protective device for high-voltage bushing insulation testing according to any one of claims 1 to 9.

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