A test docking device for a power-type GIS voltage transformer

Abstract

This utility model discloses a test docking device for a power-type GIS voltage transformer, belonging to the field of transformer testing technology. It includes a propulsion bracket with wheels at the bottom, and two support frames mounted on the propulsion bracket, distributed front and rear along the direction of movement of the propulsion bracket. Each support frame is independently mounted on the propulsion bracket via a lifting mechanism. Each end of the support frame has an abutment mechanism, and the line connecting the two abutment mechanisms is perpendicular to the line connecting the two support frames. Each support frame is equipped with a separate lifting mechanism, allowing for independent adjustment of the height of the front and rear ends of the GIS voltage transformer, achieving precise adjustment of the docking angle and ensuring that its mounting surface is parallel to the mounting surface of the GIS test transformer. This solves the alignment difficulties caused by the offset center of gravity or irregular shape of large-volume equipment, significantly improving docking accuracy, reducing repeated alignment time, and allowing for flexible movement of the wheels to reduce docking impact, thus improving overall operational convenience.

Description

Technical Field

[0001] This utility model belongs to the field of instrument transformer testing technology, specifically a test docking device for power-type GIS voltage transformers. Background Technology

[0002] The core function of a power-type GIS voltage transformer is to proportionally convert high voltage into low voltage signals to meet the needs of measurement, protection, and control systems. Testing of power-type GIS voltage transformers is a crucial step in ensuring their reliable performance and safe operation. This includes tests such as power frequency withstand voltage testing and partial discharge testing. Power frequency withstand voltage testing: Independent pillar-type EVTs (electromagnetic voltage transformers) contain their own insulation structure and require power frequency withstand voltage testing. This is a limit test of the insulation structure and can be performed at 80% of the corresponding standard voltage value. Partial discharge testing: Partial discharge measurement should ideally be performed simultaneously with AC withstand voltage testing. For transformers with voltage ratings of 35-110kV, partial discharge measurement can be performed on a 10% sampling basis. If the partial discharge level does not meet the specified requirements, the sampling rate should be increased. For transformers with voltage ratings of 220kV and above, partial discharge measurement should be performed when there is doubt about the insulation performance.

[0003] The above tests are usually conducted on GIS test transformers, and the connection and disassembly of voltage transformers before and after the tests constitute a crucial part of the test process. When dealing with heavy, bulky, and irregularly shaped products such as 500kV power-type GIS voltage transformers, existing connection devices consume a lot of time during the connection process, are prone to causing significant impact on the test transformer, and are relatively inconvenient to operate. Utility Model Content

[0004] To address the issues of operational inconvenience and significant impact during test docking, this invention provides a test docking device for power-type GIS voltage transformers.

[0005] This utility model is achieved through the following technical solution:

[0006] A test docking device for a power-type GIS voltage transformer includes a propulsion bracket with movable wheels at the bottom, a support frame on the propulsion bracket, two support frames distributed back and forth along the moving direction of the propulsion bracket, and the two support frames are independently installed on the propulsion bracket by a lifting mechanism.

[0007] The support frame is provided with abutment mechanisms at both ends, and the line connecting the two abutment mechanisms is perpendicular to the line connecting the two support frames.

[0008] The two support frames are each equipped with a lifting mechanism, which can adjust the height of the front and rear ends of the GIS voltage transformer separately to achieve precise adjustment of the docking angle and ensure that its mounting surface is parallel to the mounting surface of the GIS test transformer. This solves the problem of alignment difficulties caused by the offset center of gravity or irregular shape of large-volume equipment. This device can significantly improve the docking accuracy for such large-sized equipment, reduce the time of repeated alignment, and the flexible movement of the casters reduces the impact force of docking, thus improving the overall ease of operation.

[0009] A further improvement of this utility model is that the lifting mechanism includes a housing fixedly mounted on a propulsion bracket. The housing contains a lifting worm gear, a threaded ring, a lifting screw, and a worm segment. The worm segment meshes with the lifting worm gear. The threaded ring is coaxially connected to the end face of the lifting worm gear. The lifting screw is threadedly connected to the threaded ring and the housing, and its top end is connected to the support frame. Utilizing the meshing transmission between the lifting worm gear and the threaded ring, the lifting operation of the lifting screw is completed through the cooperation of the threaded ring and the housing, thereby adjusting the height of the support frame. This structure has high transmission efficiency, good self-locking performance, and can withstand heavy loads, avoiding the risk of slippage or falling due to gravity. The housing encapsulates the core transmission components, protecting the internal structure from external dust and moisture, extending the service life of the device, and reducing maintenance costs.

[0010] A further improvement of this invention is that the aforementioned housing is also provided with a hand-cranked shaft that penetrates the housing, and the worm gear section is coaxially disposed on the outer wall of the hand-cranked shaft. The hand-cranked shaft directly drives the worm gear section to rotate, achieving synchronous rotation of the lifting worm wheel, reducing intermediate transmission backlash, and improving adjustment accuracy.

[0011] A further improvement of this utility model is that a handwheel is provided at one end of the aforementioned hand-cranked shaft.

[0012] A further improvement of this invention is that guide columns are provided on both sides of the lifting mechanism, with the top of the guide columns connected to the support frame and the bottom of the guide columns penetrating the propulsion bracket. Through the cooperation of the lifting mechanism and the guide columns, three-point support is formed for the support frame, which can distribute the weight load while also stabilizing the movement trajectory of the support frame.

[0013] A further improvement of this utility model is that the aforementioned abutment mechanism includes an abutment base and a contact roller; the abutment base is rotatably mounted on the support frame, and the contact roller is rotatably mounted on top of the abutment base. The abutment base can rotate around the support frame, and in conjunction with the top contact roller, the voltage transformer naturally adheres to the support surface under the action of gravity; the contact roller is made of high-strength wear-resistant material (such as bearing steel), with a rolling friction coefficient as low as below 0.01, allowing the transformer to rotate easily even under heavy loads, avoiding jamming or surface scratches caused by traditional rigid supports.

[0014] A further improvement of this invention is that the aforementioned propulsion support is provided with tracks on both sides to limit the movement of the wheels. The tracks limit the movement trajectory of the wheels.

[0015] A further improvement of this invention is that the track has an overall C-shaped structure, with the opening of the track facing the side of the moving wheel; a guide pin is coaxially arranged on the outer surface of the moving wheel, and the guide pin cooperates with the opening of the track. The guide pin abuts against the bottom surface of the upper wing plate of the track, preventing it from accidentally dislodging during the rotation of the moving wheel.

[0016] A further improvement of this utility model is that the aforementioned propulsion support includes a propulsion frame and propulsion trays; two propulsion trays are provided, each supporting one of the two lifting mechanisms; the bottom surface of the propulsion frame is provided with casters. The two propulsion trays respectively support the lifting mechanisms distributed front and rear, evenly distributing the weight of the GIS current transformer onto the propulsion frame.

[0017] As can be seen from the above technical solution, the beneficial effects of this utility model are: the two support frames are equipped with separate lifting mechanisms, which can adjust the height of the front and rear ends of the GIS voltage transformer respectively, so as to achieve precise adjustment of the docking angle and ensure that its installation surface is parallel to the installation surface of the GIS test transformer, thus solving the problem of alignment difficulties caused by the center of gravity shift or irregular shape of large-volume equipment; it can significantly improve the docking accuracy for such large-size equipment, reduce the time of repeated alignment, and the flexible movement of the moving wheels reduces the docking impact force, thus improving the overall convenience of operation. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram of the first structure of the propulsion support according to a specific embodiment of the present utility model.

[0021] Figure 3 This is a schematic diagram of the second structure of the propulsion support according to a specific embodiment of the present utility model.

[0022] Figure 4 This is a schematic diagram of the internal exploded structure of the lifting mechanism according to a specific embodiment of the present invention.

[0023] In the attached diagram: 10, GIS voltage transformer; 20, GIS test transformer; 30, track; 40, propulsion support; 41, propulsion frame; 42, propulsion tray; 50, moving wheel; 51, guide pin; 60, support frame; 70, lifting mechanism; 71, handwheel; 711, hand-cranked shaft; 72, housing; 721, lifting worm gear; 722, threaded ring; 723, worm section; 73, lifting screw; 74, top cap; 75, guide column; 80, abutment mechanism; 81, abutment base; 82, contact roller. Detailed Implementation

[0024] 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.

[0025] Example 1:

[0026] like Figures 1-4 As shown, this utility model discloses a test docking device for a power-type GIS voltage transformer, including a propulsion bracket 40 with movable wheels 50 at the bottom. Two support frames 60 are provided on the propulsion bracket 40, distributed front and rear along the moving direction of the propulsion bracket 40. The two support frames 60 are independently mounted on the propulsion bracket 40 via lifting mechanisms 70. Each support frame 60 is equipped with a separate lifting mechanism 70, which can adjust the height of the front and rear ends of the GIS voltage transformer 10, achieving precise adjustment of the docking angle and ensuring that its mounting surface is parallel to the mounting surface of the GIS test transformer 20. This solves the alignment difficulty problem caused by the center of gravity shift or irregular shape of large-volume equipment; it can significantly improve the docking accuracy for such large-sized equipment, reduce repeated alignment time, and the movable wheels 50 allow for flexible movement, reducing docking impact and improving overall operational convenience.

[0027] The lifting mechanism 70 includes a housing 72 fixedly mounted on the propulsion bracket 40. The housing 72 contains a lifting worm gear 721, a threaded ring 722, a lifting screw 73, and a worm section 723. The worm section 723 meshes with the lifting worm gear 721. The threaded ring 722 is coaxially connected to the end face of the lifting worm gear 721. The lifting screw 73 is vertically arranged and threadedly connected to the threaded ring 722 and the housing 72. The top end of the lifting screw 73 is connected to the support frame 60. In other words, the lifting worm gear 721 drives the threaded ring 722 to rotate synchronously. The threaded ring 722 and the housing 72 have threaded structures on the walls of the holes through which the lifting screw 73 passes, allowing the lifting screw 73 to move vertically relative to the housing 72 when the threaded ring 722 engages with the housing 72. The lifting screw 73 is raised and lowered by the meshing transmission of the lifting worm gear 721 and the threaded ring 722, which cooperates with the housing 72, thereby adjusting the height of the support frame 60. This structure has high transmission efficiency, good self-locking performance, and can withstand heavy loads, avoiding the risk of slippage or falling due to gravity. The housing 72 encapsulates the core transmission components, protecting the internal structure from external dust and moisture, extending the service life of the device, and reducing maintenance costs.

[0028] The housing 72 is also provided with a hand-cranked shaft 711 that penetrates the housing 72, and the worm gear section 723 is coaxially arranged on the outer wall of the hand-cranked shaft 711. The hand-cranked shaft 711 directly drives the worm gear section 723 to rotate, realizing the synchronous rotation of the lifting worm wheel 721, reducing intermediate transmission backlash, and improving adjustment accuracy. A handwheel 71 is provided at one end of the hand-cranked shaft 711.

[0029] The upper and lower sides of the lifting worm gear 721 and the threaded ring 722 are rotatably mounted in the housing 72 via bearings, and the hand crank shaft 711 is also rotatably mounted on the housing 72 via bearings.

[0030] Example 2:

[0031] like Figures 1-3 As shown, guide columns 75 are provided on both sides of the lifting mechanism 70. The top of the guide column 75 is connected to the support frame 60, and the bottom of the guide column 75 passes through the push bracket 40. Through the cooperation of the lifting mechanism 70 and the guide column 75, three-point support is formed for the support frame 60, which can distribute the weight load and stabilize the movement trajectory of the support frame 60.

[0032] The top ends of the guide column 75 and the lifting screw 73 are respectively connected to the bottom surface of the support frame 60 through the top cap 74. This helps to increase the contact area with the support frame 60.

[0033] The lifting screw 73 is located at the center of the support frame 60, and two guide columns 75 are symmetrically arranged on both sides of the lifting screw 73.

[0034] Example 3:

[0035] like Figures 1-3 As shown, the support frame 60 is provided with abutment mechanism 80 at both ends, and the line connecting the two abutment mechanisms 80 is perpendicular to the line connecting the two support frames 60.

[0036] The contact mechanism 80 includes a contact base 81 and a contact roller 82. The contact base 81 is rotatably mounted on the support frame 60, and the contact roller 82 is rotatably mounted on top of the contact base 81. The contact base 81 can rotate around the support frame 60, and in conjunction with the top contact roller 82, the voltage transformer naturally adheres to the support surface under gravity. The contact roller 82 is made of high-strength wear-resistant material (such as bearing steel), with a rolling friction coefficient as low as 0.01, allowing the transformer to rotate easily even under heavy loads, avoiding jamming or surface scratches caused by traditional rigid supports.

[0037] The top of the outer wall of the abutment base 81 has a notch, and the contact roller 82 is installed in the notch. At this time, the top of the contact roller 82 protrudes from the top surface of the abutment base 81, and the side of the contact roller 82 protrudes from the side of the abutment base 81. This helps to avoid the protruding part of the GIS voltage transformer 10.

[0038] Example 3:

[0039] like Figure 1 As shown, the propulsion support 40 is also provided with tracks 30 on both sides to limit the movement of the moving wheels 50. The tracks 30 limit the movement trajectory of the moving wheels 50.

[0040] The track 30 has an overall C-shaped structure, with its opening facing the movable wheel 50. A guide pin 51 is coaxially mounted on the outer surface of the movable wheel 50, and the guide pin 51 engages with the opening of the track 30. The guide pin 51 abuts against the bottom surface of the upper wing plate of the track 30, preventing the movable wheel 50 from accidentally dislodging during rotation.

[0041] The propulsion support 40 includes a propulsion frame 41 and a propulsion support plate 42; two propulsion support plates 42 are provided, and the two propulsion support plates 42 respectively support the two lifting mechanisms 70; the bottom surface of the propulsion frame 41 is provided with casters 50. The two propulsion support plates 42 respectively carry the lifting mechanisms 70 distributed in a front-to-back manner, so as to evenly distribute the weight of the GIS current transformer onto the propulsion frame 41.

[0042] In summary, the operating method of this device is as follows: 1. Use a crane to hoist the GIS current transformer to the docking device; 2. Push the bracket to move the entire GIS current transformer to the docking position; 3. Adjust the front and rear lifting mechanism 70 to complete the height adjustment of the support frame 60, ensuring that the mounting surface of the GIS current transformer is parallel to the mounting surface of the GIS test transformer 20 and that the center height of the docking surfaces is consistent; 4. Rotate the GIS current transformer to make it rotate axially and align it with the mounting holes on the mounting surface; 5. Finally, use bolts to tighten the docking flange of the current transformer and the test transformer.

[0043] This utility model discloses a test docking device for a power-type GIS voltage transformer. Two support frames are individually equipped with lifting mechanisms, allowing for precise adjustment of the front and rear ends of the GIS voltage transformer. This ensures the mounting surface of the transformer is parallel to the mounting surface of the GIS test transformer, solving the alignment difficulties caused by the offset center of gravity or irregular shape of large-volume equipment. This device significantly improves the docking accuracy for such large-sized equipment, reduces repeated alignment time, and the flexible movement of the casters reduces docking impact, thus improving overall operational convenience.

[0044] 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. A test docking device for a power-type GIS voltage transformer, comprising a propulsion support (40) with casters (50) at the bottom, characterized in that, The propulsion bracket (40) is provided with a support frame (60). There are two support frames (60), and the two support frames (60) are distributed back and forth along the moving direction of the propulsion bracket (40). The two support frames (60) are independently installed on the propulsion bracket (40) through lifting mechanisms (70). The two ends of the support frame (60) are respectively provided with abutment mechanisms (80), and the line connecting the two abutment mechanisms (80) is perpendicular to the line connecting the two support frames (60).

2. The test connection device for a power-type GIS voltage transformer according to claim 1, characterized in that, The lifting mechanism (70) includes a housing (72) fixedly mounted on the propulsion bracket (40). The housing (72) is provided with a lifting worm gear (721), a threaded ring (722), a lifting screw (73), and a worm section (723). The worm section (723) meshes with the lifting worm gear (721). The threaded ring (722) is coaxially connected to the end face of the lifting worm gear (721). The lifting screw (73) is threadedly connected to the threaded ring (722) and the housing (72), and the top end of the lifting screw (73) is connected to the support frame (60).

3. The test connection device for a power-type GIS voltage transformer according to claim 2, characterized in that, The housing (72) is also provided with a hand crank shaft (711) that passes through the housing (72), and the worm gear section (723) is coaxially arranged on the outer wall of the hand crank shaft (711).

4. The test connection device for a power-type GIS voltage transformer according to claim 3, characterized in that, One end of the hand crank shaft (711) is provided with a handwheel (71).

5. A test connection device for a power-type GIS voltage transformer according to any one of claims 1 to 4, characterized in that, The lifting mechanism (70) is provided with guide columns (75) on both sides. The top of the guide column (75) is connected to the support frame (60), and the bottom of the guide column (75) passes through the propulsion bracket (40).

6. A test connection device for a power-type GIS voltage transformer according to any one of claims 1 to 4, characterized in that, The abutting mechanism (80) includes an abutting base (81) and a contact roller (82); the abutting base (81) is rotatably mounted on the support frame (60), and the contact roller (82) is rotatably mounted on the top of the abutting base (81).

7. A test connection device for a power-type GIS voltage transformer according to any one of claims 1 to 4, characterized in that, The propulsion support (40) is also provided with tracks (30) on both sides to limit the movement of the wheels (50).

8. A test connection device for a power-type GIS voltage transformer according to claim 7, characterized in that, The track (30) has a C-shaped structure, and the opening of the track (30) faces the side of the moving wheel (50); a guide pin (51) is coaxially arranged on the outer side of the moving wheel (50), and the guide pin (51) cooperates with the opening of the track (30).

9. A test connection device for a power-type GIS voltage transformer according to any one of claims 1 to 4, characterized in that, The propulsion support (40) includes a propulsion frame (41) and a propulsion tray (42); there are two propulsion trays (42), and the two propulsion trays (42) support the two lifting mechanisms (70) respectively; the bottom surface of the propulsion frame (41) is provided with casters (50).

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