An integrated leakage detection insulation test device and method for outlet bushing

Abstract

The present invention relates to the field of detection of outlet bushings, and specifically to an integrated leakage detection and insulation test device and method for outlet bushings. The device comprises a test chamber and a test assembly arranged in the test chamber. One end of the outlet bushing to be detected extends into the test chamber and is connected to the test assembly. The test assembly is used to perform a leakage test on the horizontally arranged outlet bushing to be detected. The device uses the test chamber and the test assembly to fill the test chamber with insulating gas, and can test 800kV GIS outlet bushings. When the device and the 800kV GIS outlet bushing are arranged horizontally, a leakage test can be performed. When the device and the 800kV GIS outlet bushing are arranged vertically, an insulation test can be performed. The entire test process only requires the installation of the device to complete two tests, which reduces the time for installing and removing different tooling, greatly improves the test efficiency of the 800kV GIS outlet bushing, and shortens the time required for the 800kV GIS outlet bushing test.

Description

Technical Field

[0001] The present invention relates to the field of outlet bushing detection, and in particular to an integrated leakage detection insulation test device and method for outlet bushings. Background Art

[0002] 800kV GIS outlet bushings, as the incoming and outgoing conductors of GIS switches, play a crucial role, separating the high-voltage portion of the overhead busbar from the outer casing. With the planning and commissioning of numerous 800kV lines in China, demand for these bushings is increasing. Manufacturers of these bushings need to increase production capacity to meet this demand. However, testing these bushings often presents a bottleneck. GIS bushings typically undergo both leakage and insulation tests to complete the entire testing process. For example, in one project, an 800kV GIS outlet bushing undergoes a leakage test. The bushing is first connected to a leakage test fixture, then the test is performed. After the test, the fixture is removed and the bushing is connected to an insulation test fixture. Finally, the insulation test completes the entire test process. Therefore, improving testing efficiency is a challenge facing existing technologies. Summary of the Invention

[0003] In response to the problems mentioned in the prior art, the present invention proposes an integrated leakage detection and insulation test device for outlet bushings. When testing 800kV GIS outlet bushings, leakage detection tests and insulation tests can be completed on the same set of tooling, ensuring reliable and stable test results while also improving test efficiency.

[0004] The present invention provides an integrated leakage detection insulation test device for an outlet bushing, comprising a test chamber and a test assembly arranged in the test chamber, one end of the outlet bushing to be tested extends into the test chamber and is connected to the test assembly, and a leakage test is performed on the horizontally arranged outlet bushing to be tested through the test assembly; an opening is provided at the top of the test chamber, a flange is provided at the opening position, the outlet bushing to be tested is assembled and connected to the test chamber through the flange and kept sealed, and the test chamber is also provided with an inflation assembly.

[0005] Preferably, a bracket is further included, the test cavity is arranged in the bracket, the outlet bushing to be tested is connected to the test assembly in the test cavity through the bracket, and the insulation test is performed on the vertically arranged outlet bushing to be tested through the bracket.

[0006] Preferably, the test assembly includes a first contact, a second contact, a basin and a blind-end shield, one end of the basin is fixedly connected to the first contact, and the other end is fixedly connected to the second contact, the first contact is provided with a plug interface that matches the outlet sleeve to be tested, and an elastic contact finger is provided in the plug interface; the second contact is provided with a plug interface that matches the blind-end shield, and an elastic contact finger is provided in the plug interface.

[0007] Preferably, the end of the basin extends to the center portion to be concave, and the center portion of the concave surface of the basin is connected to the first contact.

[0008] Preferably, the test chamber includes a main tooling cylinder, an auxiliary tooling cylinder and a final tooling cylinder, which are fixedly connected, and a plurality of sealing rings are provided between the main tooling cylinder, the auxiliary tooling cylinder and the final tooling cylinder.

[0009] Preferably, the side wall of the auxiliary tooling barrel is provided with at least one set of mounting holes, and the mounting holes match the basin.

[0010] Preferably, the side wall of the main tooling barrel is provided with an inflation component, and the inflation component is at least one valve.

[0011] Preferably, the insulating gas is filled in or released through the valve.

[0012] Preferably, the outlet bushing includes a central conductor and an insulating shell sleeved on the surface of the central conductor, and a voltage-equalizing ring is further provided on the top of the central conductor.

[0013] Compared with the prior art, the present invention has achieved the following technical effects:

[0014] This device uses the test chamber and test components to fill the test chamber with insulating gas, which can test the 800kV GIS outlet bushing. When the device and the 800kV GIS outlet bushing are set horizontally, a leakage test can be carried out. When the device and the 800kV GIS outlet bushing are set vertically, an insulation test can be carried out. The entire test process only requires the installation of this device to complete both tests, which reduces the time for installing and removing different tooling, greatly improves the test efficiency of the 800kV GIS outlet bushing, and shortens the time required for the 800kV GIS outlet bushing test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the test chamber of the present invention;

[0017] Figure 3 This is a schematic diagram of the test assembly of the present invention;

[0018] Figure 4 Schematic diagram of the first contact of the present invention.

[0019] Figure numerals: 1. voltage-grading ring; 2. insulating shell; 3. center conductor; 4. shielding device; 5. test chamber; 51. main tooling cylinder; 52. auxiliary tooling cylinder; 53. final tooling cylinder; 6. bracket; 7. first contact; 8. second contact; 9. basin; 10. blind end shield; 11. elastic contact finger. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0021] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0022] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0023] like Figure 1As shown, the present invention provides an integrated leakage detection and insulation test device for an outlet bushing, comprising a test chamber 5 and a test assembly disposed within the test chamber 5. One end of the outlet bushing to be tested extends into the test chamber 5 and is connected to the test assembly. The test assembly is used to perform a leakage test on the horizontally arranged outlet bushing to be tested. The test chamber 5 has an opening at the top, and a flange is disposed at the opening position. The outlet bushing to be tested is assembled and connected to the test chamber 5 via the flange and maintained sealed. The test chamber 5 also has an inflation assembly. In this embodiment, the outlet bushing to be tested includes a center conductor 3 and an insulating shell 2 sleeved on the surface of the center conductor 3. A grading ring 1 is also disposed on the top of the center conductor 3. The grading ring 1 is a tubular structure with a diameter of 2200 mm. The insulating shell 2 can isolate the internal live part from the non-live part. The height is 8000 mm and is preferably made of ceramic. The center conductor 3 serves as an internal charge and current carrier, and is preferably made of 6063-T6 aluminum alloy with strong current carrying capacity. A shielding device 4 sleeved on the center conductor 3 serves to equalize the internal field strength.

[0024] The test chamber 5 is provided in the bracket 6, and the outlet bushing to be tested is connected to the test assembly in the test chamber 5 through the bracket 6, and the insulation test is performed on the vertically arranged outlet bushing to be tested through the bracket 6. Figure 1 As shown, the bracket 6 is used to support the outlet bushing to be tested. The top of the bracket 6 is fixedly connected to the insulating shell 2 of the outlet bushing to be tested through matching flanges and bolts. The central conductor 3 of the outlet bushing to be tested extends into the test cavity 5 and is connected to the test assembly.

[0025] The test assembly includes a first contact 7, a second contact 8, a basin 9 and a blind-end shield 10. One end of the basin 9 is fixedly connected to the first contact 7, and the other end is fixedly connected to the second contact 8. The first contact 7 has a plug-in interface that matches the outlet sleeve to be tested, and a resilient contact finger 11 is provided in the plug-in interface; the second contact 8 has a plug-in interface that matches the blind-end shield 10, and a resilient contact finger 11 is provided in the plug-in interface. The end of the basin 9 extends to the center and is concave. The center of the concave surface of the basin 9 is connected to the first contact 7. Figure 2 、 Figure 3 as well as Figure 4 As shown, in this embodiment, the first contact 7 is used to connect to the center conductor 3. The first contact 7 is U-shaped, and a plurality of elastic contact fingers 11 are provided at both ends of the plug interface. A stable electrical connection is formed with the center conductor 3 through the elastic contact fingers 11. In this embodiment, the end of the basin 9 extends to the center portion and is concave. The center portion of the concave surface is fixedly connected to the first contact 7. The basin 9 can isolate the internal live parts of the main tooling barrel 51 and the auxiliary tooling barrel 52 from the insulating shell 2 and play a fixing role, as shown in FIG. Figure 2As shown, one end of the basin 9 is connected to the auxiliary tooling tube 52 through a sealing ring, and the other end is connected to the final tooling tube 53 through a sealing ring; the central portion of the convex surface of the basin 9 is fixedly connected to the second contact 8, and the plug interface of the second contact 8 is connected to the blind end shield 10. The blind end shield 10 of this embodiment is rounded at one end away from the second contact 8, which equalizes the field strength of the live blind end, so that the insulation test can be completed smoothly without causing local breakdown.

[0026] The test chamber 5 includes a main tooling cylinder 51, an auxiliary tooling cylinder 52 and a final tooling cylinder 53, which are fixedly connected, wherein a plurality of sealing rings are provided between the main tooling cylinder 51, the auxiliary tooling cylinder 52 and the final tooling cylinder 53. Figure 2 As shown, the main tooling cylinder 51, the auxiliary tooling cylinder 52 and the final tooling cylinder 53 are fixedly connected in sequence through flanges, and the flanges are connected by bolts. A closed chamber is formed between the three installation cylinders. The provided sealing ring can better play a sealing role. The central conductor 3 of the outlet bushing is connected to the closed chamber. Insulating gas is introduced into the closed chamber, and the outlet bushing to be tested can be subjected to a leak test and / or insulation test.

[0027] The side wall of the auxiliary tooling barrel 52 is provided with at least one set of mounting holes, which match the basin 9. In this embodiment, two sets of mounting holes are preferably provided, with different mounting holes being used to adapt to basins 9 of different sizes, namely, basins 9 with a diameter of 890 mm and basins 9 with a diameter of 885 mm. In this embodiment, the mounting holes adapted to the basin 9 with a diameter of 885 mm are selected.

[0028] The sidewall of the main tooling tube 51 is provided with an inflatable assembly, which comprises at least one valve. The valve is configured to allow for the injection or release of insulating gas. The valve can be used to perform leak tests or insulation tests on the bushing to be inspected. SF6 gas is preferred as the insulating gas.

[0029] When installing this device, first place the final tooling cylinder 53 horizontally on the bracket, install the second contact 8 at the center of the convex surface of the basin 9, and install the elastic contact finger 11 into the second contact 8, and then insert the blind end shield 10 into the second contact 8; at this time, lift the installed components, put a sealing ring in the sealing groove of the final tooling cylinder 53, and install it on the final tooling cylinder 53 with bolts, then install the first contact 7 to the center of the concave surface of the basin 9, and install the elastic contact finger 11 into the first contact 7, lift the auxiliary tooling cylinder 52, put a sealing ring in the sealing groove of the basin 9, and install the auxiliary tooling cylinder 52 on the basin 9 with bolts, and then connect the main tooling cylinder 51 with the auxiliary tooling cylinder 52 to complete the entire installation process.

[0030] After the installed outlet bushing is assembled and kept horizontal, it is docked and connected to the device. The end of the center conductor 3 is embedded and connected to the first contact 7. The top of the main tooling tube 51 is connected to the insulating shell 2. After the connection, vacuum is first evacuated and the insulating gas with the operating pressure required for the test (0.3MPa-0.5MPa) is filled through the valve. At the same time, the connection points of the various components of the outlet bushing (between the grading ring 1 and the insulating shell 2, between the shielding device 4 and the insulating shell 2, etc.) are wrapped with plastic bags and left to stand for 24 hours. Then, the gas at the wrapped area is tested with a probe leak detector. If the requirements are met, the leak test is completed.

[0031] After completing the leak test, use a dedicated insulating gas recovery device to recover the insulating gas in the test chamber 5 to zero gauge pressure, transport the device to the test hall, place the bracket 6 at a suitable position in the test hall, adjust the device to a vertical state, place it in the bracket 6 and connect it to the bracket 6 with bolts, connect the outlet bushing to the device vertically, first evacuate the vacuum, and fill it with insulating gas of the operating pressure (0.3MPa-0.4MPa) required for the test through the valve, apply various test voltages required by the standard, such as lightning impulse withstand voltage, switching impulse withstand voltage, and power frequency voltage, to the end of the outlet bushing to complete the insulation test.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for an integrated leakage detection insulation test device for an outlet bushing, characterized in that: The invention comprises a test chamber (5) and a test assembly arranged in the test chamber (5); one end of the outlet casing to be tested extends into the test chamber (5) and is connected to the test assembly; and a leak test is performed on the horizontally arranged outlet casing to be tested through the test assembly; The top of the test chamber (5) is provided with an opening, and a flange is provided at the opening position. The outlet casing to be tested is assembled and connected to the test chamber (5) through the flange and kept sealed. The test chamber (5) is also provided with an inflation component; The apparatus further comprises a bracket (6), wherein the test chamber (5) is arranged in the bracket (6), the outlet bushing to be tested is connected to the test assembly in the test chamber (5) via the bracket (6), and an insulation test is performed on the vertically arranged outlet bushing to be tested via the bracket (6); The test assembly comprises a first contact (7), a second contact (8), a basin (9) and a blind-end shield (10); one end of the basin (9) is fixedly connected to the first contact (7), and the other end is fixedly connected to the second contact (8); the first contact (7) is provided with a plug-in interface matching the outlet sleeve to be detected, and a resilient contact finger is provided in the plug-in interface; the second contact (8) is provided with a plug-in interface matching the blind-end shield (10), and a resilient contact finger (11) is provided in the plug-in interface; The method comprises the following steps: Step 1: Install the device; Step 2: Connect the outlet casing to be tested to the device in a horizontal state and perform a leak test on the outlet casing to be tested; Step 3: After completing the leak test, adjust the device to a vertical state, place it in the bracket and connect it to the bracket with bolts, connect the outlet bushing to the device while keeping it in a vertical state, and perform an insulation test on the outlet bushing to be tested.

2. The method of the integrated leakage detection insulation test device for outlet bushing according to claim 1, characterized in that: The end of the basin (9) extends to the center portion and is arranged in a concave surface, and the center portion of the concave surface of the basin (9) is connected to the first contact (7).

3. The method of the integrated leakage detection insulation test device for outlet bushing according to claim 1, characterized in that: The test chamber (5) comprises a main tooling cylinder (51), an auxiliary tooling cylinder (52) and a final tooling cylinder (53), wherein the main tooling cylinder (51), the auxiliary tooling cylinder (52) and the final tooling cylinder (53) are fixedly connected, wherein a plurality of sealing rings are provided between the main tooling cylinder (51), the auxiliary tooling cylinder (52) and the final tooling cylinder (53).

4. The method of the integrated leakage detection insulation test device for outlet bushing according to claim 3, characterized in that: The side wall of the auxiliary tooling barrel (52) is provided with at least one set of mounting holes, and the mounting holes match the basin (9).

5. The method of the integrated leakage detection insulation test device for outlet bushing according to claim 3, characterized in that: The side wall of the main tooling cylinder (51) is provided with an inflation component, and the inflation component is at least one valve.

6. The method of the integrated leakage detection insulation test device for outlet bushing according to claim 5, characterized in that: The insulating gas is filled in or released through the valve.

7. The method of the integrated leakage detection insulation test device for outlet bushing according to claim 1, characterized in that: The outlet bushing comprises a central conductor (3) and an insulating shell (2) sleeved on the surface of the central conductor (3); a voltage grading ring (1) is also provided on the top of the central conductor (3).

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