A large power transformer low-voltage lead test device and a measuring method thereof

Abstract

This invention relates to a low-voltage lead test assembly device and its measurement method for a large power transformer, belonging to the field of transformer technology. The technical solution is as follows: two supporting longitudinal beams (5) are connected together by adjusting screw one (6A) and nut one (7A); two supporting transverse beams (1) are respectively connected to the upper inner side of the corresponding supporting longitudinal beam (5) by adjusting screw two (6B) and nut two (7B); two connecting plates (2) are respectively connected to the lower outer side of the corresponding supporting longitudinal beam (5); each connecting plate (2) is provided with a slide rail (3) and a sliding plate (4) matching the slide rail (3); the sliding plate (4) moves laterally along the slide rail (3). The beneficial effect of this invention is that it can accurately measure the length of the low-voltage lead without installing an oil tank, riser, and bushing, thus completing the low-voltage lead assembly work.

Description

Technical Field

[0001] This invention relates to a test fitting device for low-voltage leads of a large power transformer and its measurement method, belonging to the field of transformer technology. Background Technology

[0002] The low-voltage bushings and coils of large AC generator transformers are generally connected by lead busbars. Due to the large capacity of the products and the large number of leads, and because the relative position of the low-voltage bushings and the transformer body cannot be calculated from the plan drawings, the actual configuration in the workshop is required to ensure that the length of the current-carrying leads is appropriate.

[0003] See attached document Figure 1-5 The traditional method for measuring and configuring the dimensions of low-voltage current-carrying leads is to first prepare components such as the oil tank, riser, and bushing, then install the bushing and other components through the lower casing of the transformer body, and only after the trial assembly is completed can the low-voltage current-carrying leads be measured and configured.

[0004] In recent years, due to the continuous increase in the production capacity of large AC generator transformers, the annual production quantity has also been increasing. As a result, components such as oil tanks, riser seats, and bushings cannot be delivered in time according to the production trial assembly requirements, which cannot meet the needs of production trial assembly. At the same time, the trial assembly work occupies a large amount of production resources such as personnel and equipment, which greatly affects the production progress. In order to solve the above problems, a device has been developed that can measure the length of low-voltage leads without the need for oil tanks, riser seats, and bushings, thereby completing the low-voltage lead configuration work. Summary of the Invention

[0005] The purpose of this invention is to provide a low-voltage lead tester and its measurement method for large power transformers, which can accurately measure the length of the low-voltage lead without installing an oil tank, riser, and bushing, thereby completing the low-voltage lead configuration and solving the problems existing in the background art.

[0006] The technical solution of this invention is:

[0007] A test assembly for low-voltage leads of a large power transformer includes a support beam, connecting plates, a slide rail, a sliding plate, a support longitudinal beam, an adjusting screw, a nut, an adjusting screw, and a nut. Two support longitudinal beams are connected together by the adjusting screw and nut. Two support beams are respectively connected to the upper inner side of the corresponding support longitudinal beam by the adjusting screw and nut. Two connecting plates are respectively connected to the lower outer side of the corresponding support longitudinal beam. Each connecting plate is provided with a slide rail and a sliding plate that matches the slide rail. The sliding plate moves laterally along the slide rail.

[0008] Furthermore, the supporting longitudinal beam is provided with multiple sets of vertically arranged adjustment holes, and the bottom of the supporting longitudinal beam is provided with a second round hole; the two ends of the first adjusting screw pass through a set of adjustment holes on the corresponding supporting longitudinal beam and are fastened with a nut to connect the two supporting longitudinal beams together; the middle of the supporting crossbeam is provided with a first round hole, and the two ends of the second adjusting screw pass through another set of adjustment holes on the corresponding supporting longitudinal beam and a first round hole on the corresponding supporting crossbeam and are fastened with a nut, connecting the two supporting crossbeams to the upper inner side of the corresponding supporting longitudinal beam. The two supporting crossbeams are arranged in parallel, and are connected by different... The first adjustment hole of the set is connected to the first round hole of the support beam to adjust the longitudinal position of the support beam on the support longitudinal beam; the connecting plate is provided with multiple sets of second adjustment holes arranged laterally, and the bolts pass through the second adjustment holes on the corresponding connecting plate and the second round hole at the bottom of the corresponding support longitudinal beam and are fastened by the sixth nut, so that the two connecting plates are respectively connected to the lower outer side of the corresponding support longitudinal beam, and the lateral position of the connecting plate on the support longitudinal beam is adjusted by connecting the second adjustment holes of different sets on the connecting plate to the second round hole at the bottom of the support longitudinal beam; the second adjustment holes arranged opposite to each other on the two connecting plates are respectively connected to the two ends of the third adjustment screw and fastened by the third nut.

[0009] Furthermore, the outer side of the middle part of the supporting crossbeam is provided with a limiting groove 1, the width of the limiting groove 1 is matched with the width of the supporting longitudinal beam, the supporting longitudinal beam is set in the limiting groove 1, and the circular hole 1 is located at the bottom of the limiting groove 1; the bottom of the supporting longitudinal beam is provided with a limiting groove 2, the width of the limiting groove 2 is matched with the width of the connecting plate, and the connecting plate is set in the limiting groove 2.

[0010] A method for measuring the low-voltage leads of a large power transformer is provided. Using the aforementioned test assembly for low-voltage leads of a large power transformer, when the on-site product meets the conditions for installing the lower tank cover and low-voltage riser of the large power transformer, the low-voltage lead connector is installed on the sliding plate. The test assembly is then placed on the low-voltage riser, with the support beam supporting the upper bushing mounting flange of the low-voltage riser. This test assembly simulates the position of the low-voltage bushing during installation. At this point, the test assembly personnel use a measuring tape to measure the distance between the low-voltage lead connector and the low-voltage copper pipe terminal block on the transformer body side; this distance is the length of the low-voltage lead.

[0011] Based on the same concept, the present invention also provides a test assembly device for low-voltage leads of a large power transformer, comprising a connecting plate, a slide rail, a sliding plate, a supporting longitudinal beam, an adjusting screw four, a nut four, an adjusting screw five, and a nut five. There are two connecting plates, which are respectively arranged on both sides of the supporting longitudinal beam. The two connecting plates are connected by adjusting screw four and nut four. The two connecting plates and the supporting longitudinal beam are connected together by adjusting screw five and nut five. Each connecting plate is provided with a slide rail and a sliding plate that cooperates with the slide rail. The sliding plate moves laterally along the slide rail.

[0012] Furthermore, the supporting longitudinal beam is provided with multiple sets of vertically arranged adjustment holes 1, and each connecting plate is provided with multiple sets of horizontally arranged adjustment holes 2; the two ends of the adjusting screw 5 pass through the adjustment holes 2 on the corresponding connecting plates and are locked by the screw 5, and the middle part of the adjusting screw 5 passes through the adjustment hole 1 of the supporting longitudinal beam and is locked by the nut 7, connecting the supporting longitudinal beam between the two connecting plates. The two connecting plates are arranged in parallel, and the horizontal and vertical positions of the connecting plates on the supporting longitudinal beam are adjusted by connecting the different sets of adjustment holes 2 on the connecting plates with the different sets of adjustment holes 1 on the supporting longitudinal beam; the two adjustment holes 2 arranged opposite to each other on the two connecting plates are respectively connected to the two ends of the adjusting screw 4 and locked by the nut 4.

[0013] A method for measuring the low-voltage leads of a large power transformer is provided. This method utilizes the aforementioned low-voltage lead test assembly for large power transformers. When the on-site product does not have the conditions for installing the lower casing cover and low-voltage riser, the test assembly is adjusted according to the relative positions of the low-voltage bushing and the low-voltage lead connector in the drawings. The low-voltage lead connector is then installed on the sliding plate, and the test assembly is installed on the low-voltage copper pipe terminal block on the transformer side. The test assembly personnel use a measuring tape to measure the distance between the low-voltage lead connector and the low-voltage copper pipe terminal block on the transformer side, which is the length of the low-voltage lead.

[0014] The beneficial effect of this invention is that it enables the accurate measurement of the low-voltage lead length without the installation of an oil tank, riser, and bushing, thereby completing the preparation of the low-voltage lead. Attached Figure Description

[0015] Figure 1 Background: Schematic diagram of the lower box of the hoisting device;

[0016] Figure 2 Background Art: Schematic diagram of fuel tank cover fastening;

[0017] Figure 3 A schematic diagram of the installation of the riser for the background technology;

[0018] Figure 4 A schematic diagram illustrating the installation of low-voltage leads and low-voltage bushings for the background technology;

[0019] Figure 5 A schematic diagram illustrating the measurement and determination of low-voltage lead length using background technology;

[0020] Figure 6 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0021] Figure 7 This is a schematic diagram of the adjustment state in Embodiment 1 of the present invention;

[0022] Figure 8 This is a diagram illustrating the effect of using the test packer in the presence of a fuel tank.

[0023] Figure 9 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0024] Figure 10 This is a diagram illustrating the effect of using the test packer without an oil tank according to the present invention;

[0025] In the diagram: 1. Support beam; 2. Connecting plate; 3. Slide rail; 4. Slide plate; 5. Support longitudinal beam; 6A. Adjusting screw 1; 7A. Nut 1; 6B. Adjusting screw 2; 7B. Adjusting screw 3; 7C. Nut 3; 6D. Adjusting screw 4; 7D. Nut 4; 6E. Adjusting screw 5; 7E. Nut 5; 8. Adjusting hole 1; 9. Adjusting hole 2; 10. Bolt. Detailed Implementation

[0026] The invention will be further described below with reference to the accompanying drawings and examples.

[0027] See attached document Figure 6-10 A test assembly for low-voltage leads of a large power transformer includes a support beam 1, a connecting plate 2, a slide rail 3, a sliding plate 4, a support longitudinal beam 5, an adjusting screw 6A, a nut 7A, an adjusting screw 6B, and a nut 7B. Two support longitudinal beams 5 are connected together by adjusting screw 6A and nut 7A. Two support beams 1 are respectively connected to the upper inner side of the corresponding support longitudinal beam 5 by adjusting screw 6B and nut 7B. Two connecting plates 2 are respectively connected to the lower outer side of the corresponding support longitudinal beam 5. Each connecting plate 2 is provided with a slide rail 3 and a sliding plate 4 that matches the slide rail 3. The sliding plate 4 moves laterally along the slide rail 3. Example 1

[0028] See attached document Figure 6 , 7 8. The test assembly includes a supporting crossbeam 1, a connecting plate 2, a slide rail 3, a sliding plate 4, a supporting longitudinal beam 5, an adjusting screw 1 6A, a nut 1 7A, an adjusting screw 2 6B, a nut 2 7B, an adjusting screw 3 6C, a nut 3 7C, an adjusting hole 8, an adjusting hole 2 9, and a bolt 10, wherein:

[0029] The support beam 1 consists of two pieces, which are used to support the entire test assembly on the low-pressure riser flange. The support beam 1 has a limit groove, the width of which matches the width of the support longitudinal beam 5. The support longitudinal beam 5 is set in the limit groove to ensure its perpendicularity to the support longitudinal beam 5.

[0030] The connecting plate 2 consists of two pieces, used to install the slide rail 3 and the slide plate 4. The connecting plate 2 is provided with multiple sets of adjustment holes 9.

[0031] The slide rail 3 is fixed on the connecting plate 2, and the slide plate 4 is slidably connected to the slide rail 3. The slide plate 4 is used to install the wiring piece at the oil-side wiring terminal of the simulated bushing. The slide rail 3 and the slide plate 4 are adjustable to meet the wiring needs of different hole spacings. With the help of multiple sets of adjustment holes 9 of the connecting plate 2, it can be adjusted to any position. Its adjustment range covers the wiring plate size of the oil-side part of all currently used high-current low-voltage bushings.

[0032] The supporting longitudinal beam 5 consists of two pieces. Multiple sets of adjustment holes 8 are located at the upper and middle sections, with two holes 8 arranged horizontally in each set. Four circular holes 2 are located at the bottom. These adjustment holes 8 can be used to adjust the position of the supporting crossbeam 1 and also serve as lifting points. A limiting groove 2 is provided on the connecting plate 2 or at the lower part of the supporting longitudinal beam 5. The width of the limiting groove 2 matches the width of the supporting longitudinal beam 5 or the connecting plate 2. In this embodiment, the connecting plate 2 is positioned within the limiting groove 2 at the lower part of the supporting longitudinal beam 5 to ensure the perpendicularity of the supporting longitudinal beam 5 to the connecting plate 2.

[0033] The two ends of the adjusting screw 6A pass through a set of adjusting holes 8 on the corresponding supporting longitudinal beam 5 and are fastened with nuts 7A to connect the two supporting longitudinal beams 5 together. A circular hole 1 is provided in the middle of the supporting crossbeam 1. The two ends of the adjusting screw 6B pass through another set of adjusting holes 8 on the corresponding supporting longitudinal beam 5 and a circular hole 1 on the corresponding supporting crossbeam 1, and are fastened with nuts 7B to connect the two supporting crossbeams 1 to the upper inner side of the corresponding supporting longitudinal beam 5. The two supporting crossbeams 1 are arranged in parallel, and the supporting crossbeams 1 are adjusted by connecting the different sets of adjusting holes 8 on the supporting longitudinal beam 5 to the circular holes 1 on the supporting crossbeam 1. The longitudinal position on the longitudinal beam 5; the connecting plate 2 is provided with multiple sets of adjusting holes 9 arranged laterally, each set of adjusting holes 9 consists of two holes arranged vertically, the bolt 10 passes through the adjusting holes 9 on the corresponding connecting plate 2 and the round hole 2 at the bottom of the corresponding supporting longitudinal beam 5 and is fastened by the nut 6, the two connecting plates 2 are respectively connected to the lower outer side of the corresponding supporting longitudinal beam 5, and the lateral position of the connecting plate 2 on the supporting longitudinal beam 5 is adjusted by connecting the different sets of adjusting holes 9 on the connecting plate 2 to the round hole 2 at the lower end of the supporting longitudinal beam 5; the adjusting holes 9 arranged opposite to each other on the two connecting plates 2 are respectively connected to the two ends of the adjusting screw 6C and fastened by the nut 7C.

[0034] The size of the oil portion of the test assembly below the low-pressure riser can be adjusted via multiple sets of adjustment holes 8 to simulate the horizontal size of the bushing. Its adjustment range covers the oil portion size of all currently used high-current low-pressure bushings.

[0035] Adjusting screw 6A, nut 7A, adjusting screw 6B, and nut 7B can adjust the spacing between the two supporting longitudinal beams 5 to simulate the horizontal spacing of the bushing terminal block. Its adjustment range covers the spacing of all currently used low-voltage, high-current bushing terminal blocks.

[0036] The entire assembly unit is made of stainless steel. Before use, adjust the dimensions to the appropriate position according to the low-voltage bushing drawing, and then install the low-voltage lead wire.

[0037] See attached document Figure 8 When the product on-site has the lower casing cover and low-voltage riser mount available, but lacks only the low-voltage bushing, the lead wire connector can be installed on the sliding plate 4. Then, the test assembly is placed on the low-voltage riser mount, with the support beam 1 supporting the upper bushing mounting flange of the low-voltage riser mount. The test assembly can then simulate the position of the low-voltage bushing during installation. The test assembly personnel use a measuring tape to measure the distance between the connector and the low-voltage copper pipe connector on the side of the unit; this distance is the low-voltage lead wire length. See the installation status section for details. Figure 8 . Example 2

[0038] See attached document Figure 9 , 10 The test assembly includes a connecting plate 2, a slide rail 3, a sliding plate 4, a supporting longitudinal beam 5, an adjusting screw 6, a nut 7, adjusting screw four 6D, nut four 7D, adjusting screw five 6E, nut five 7E, adjusting hole one 8, and adjusting hole two 9. There are two connecting plates 2, respectively located on both sides of the supporting longitudinal beam 5. The two connecting plates 2 and the supporting longitudinal beam 5 are connected together by adjusting screw four 6D and nut four 7D. Each connecting plate 2 has multiple sets of adjusting holes two 9, a slide rail 3, and a sliding plate 4 that cooperates with the slide rail 3. The two ends of the adjusting screw five 6E pass through the adjusting holes two 9 on the corresponding connecting plates 2 and are locked by screw five 6E. The middle part of the adjusting screw five 6E passes through the adjusting hole one 8 of the supporting longitudinal beam 5 and is locked by nut seven, connecting the supporting longitudinal beam 5 between the two connecting plates 2. The two connecting plates 2 are arranged in parallel.

[0039] The rest is the same as in Example 1.

[0040] See attached document Figure 10 A method for measuring the low-voltage leads of a large power transformer is described. When the product on site lacks the conditions for lowering the tank cover and installing the low-voltage riser (and simultaneously lacks the oil tank and low-voltage bushing), the test assembly can be disassembled and reassembled. After adjusting the test assembly according to the relative positions of the bushing and the connecting piece in the drawings, the connecting piece is installed on the slide plate 4. Then, the test assembly is installed on the low-voltage copper pipe terminal block on the transformer side. The test assembly personnel use a measuring tape to measure the distance between the terminal block and the low-voltage copper pipe terminal block on the transformer side; this distance is the length of the low-voltage lead. (See attached diagram.) Figure 10 .

Claims

1. A test fitting device for low-voltage leads of a large power transformer, characterized in that: It includes a support beam (1), a connecting plate (2), a slide rail (3), a sliding plate (4), a support longitudinal beam (5), an adjusting screw (6A), a nut (7A), an adjusting screw (6B), and a nut (7B). The two support longitudinal beams (5) are connected together by the adjusting screw (6A) and the nut (7A). The two support beams (1) are respectively connected to the upper inner side of the corresponding support longitudinal beam (5) by the adjusting screw (6B) and the nut (7B). The two connecting plates (2) are respectively connected to the lower outer side of the corresponding support longitudinal beam (5). Each connecting plate (2) is provided with a slide rail (3) and a sliding plate (4) that matches the slide rail (3). The sliding plate (4) moves laterally along the slide rail (3). The supporting longitudinal beam (5) is provided with multiple sets of vertically arranged adjustment holes (8), and the bottom of the supporting longitudinal beam (5) is provided with a round hole (2); the two ends of the adjusting screw (6A) pass through a set of adjustment holes (8) on the corresponding supporting longitudinal beam (5) and are fastened by a nut (7A) to connect the two supporting longitudinal beams (5) together; the middle position of the supporting crossbeam (1) is provided with a round hole (1), and the two ends of the adjusting screw (6B) pass through another set of adjustment holes (8) on the corresponding supporting longitudinal beam (5) and a round hole (1) on the corresponding supporting crossbeam (1) and are fastened by a nut (7B) to connect the two supporting crossbeams (1) to the upper inner side of the corresponding supporting longitudinal beam (5) respectively. The two supporting crossbeams (1) are arranged in parallel and are connected by different sets of adjustment holes (8) on the supporting longitudinal beam (5) 8) Connect to the circular hole one of the supporting beam (1) to adjust the longitudinal position of the supporting beam (1) on the supporting longitudinal beam (5); the connecting plate (2) is provided with multiple sets of horizontally arranged adjusting holes two (9), the bolt (10) passes through the adjusting holes two (9) on the corresponding connecting plate (2) and the circular hole two at the bottom of the corresponding supporting longitudinal beam (5) and is fastened by the nut six, the two connecting plates (2) are respectively connected to the lower outer side of the corresponding supporting longitudinal beam (5), and the horizontal position of the connecting plate (2) on the supporting longitudinal beam (5) is adjusted by connecting the different sets of adjusting holes two (9) on the connecting plate (2) with the lower circular hole two of the supporting longitudinal beam (5); the adjusting holes two (9) arranged opposite to each other on the two connecting plates (2) are respectively connected to the two ends of the adjusting screw three (6C) and fastened by the nut three (7C); The middle outer side of the supporting crossbeam (1) is provided with a limiting groove 1. The width of the limiting groove 1 matches the width of the supporting longitudinal beam (5). The supporting longitudinal beam (5) is set in the limiting groove 1, and the round hole 1 is located at the bottom of the limiting groove 1. The bottom of the supporting longitudinal beam (5) is provided with a limiting groove 2. The width of the limiting groove 2 matches the width of the connecting plate (2). The connecting plate (2) is set in the limiting groove 2.

2. The low-voltage lead test fitting for a large power transformer according to claim 1, characterized in that: It includes a connecting plate (2), a slide rail (3), a sliding plate (4), a supporting longitudinal beam (5), an adjusting screw four (6D), a nut four (7D), an adjusting screw five (6E), and a nut five (7E). There are two connecting plates (2), which are respectively set on both sides of the supporting longitudinal beam (5). The two connecting plates (2) are connected by adjusting screw four (6D) and nut four (7D). The two connecting plates (2) and the supporting longitudinal beam (5) are connected together by adjusting screw five (6E) and nut five (7E). Each connecting plate (2) is provided with a slide rail (3) and a sliding plate (4) that cooperates with the slide rail (3). The sliding plate (4) moves laterally along the slide rail (3).

3. A test fitting device for low-voltage leads of a large power transformer according to claim 2, characterized in that: The supporting longitudinal beam (5) is provided with multiple sets of vertically arranged adjustment holes 1 (8), and each connecting plate (2) is provided with multiple sets of horizontally arranged adjustment holes 2 (9); the two ends of the adjusting screw 5 (6E) pass through the adjustment holes 2 (9) on the corresponding connecting plate (2) and are locked by the screw 5 (6E), the middle part of the adjusting screw 5 (6E) passes through the adjustment hole 1 (8) of the supporting longitudinal beam (5) and is locked by the nut 7, connecting the supporting longitudinal beam (5) between the two connecting plates (2), the two connecting plates (2) are arranged in parallel, and the different sets of adjustment holes 2 (9) on the connecting plate (2) are connected to the different sets of adjustment holes 1 (8) on the supporting longitudinal beam (5) to adjust the horizontal and vertical positions of the connecting plate (2) on the supporting longitudinal beam (5); the two adjustment holes 2 (9) arranged opposite to each other on the two connecting plates (2) are connected to the two ends of the adjusting screw 4 (6D) and locked by the nut 4 (7D).

4. A method for measuring the low-voltage leads of a large power transformer, using the low-voltage lead test apparatus for large power transformers as defined in any one of claims 1-3, characterized in that: When the on-site product meets the conditions for installing the lower box cover and low-voltage riser of a large power transformer, the low-voltage lead connector is installed on the slide plate (4), and then the test assembly is placed in the low-voltage riser so that the support beam (1) is supported on the upper bushing mounting flange of the low-voltage riser. The test assembly can simulate the position of the low-voltage bushing during installation. At this time, the test assembly personnel use a measuring tape to measure the distance between the low-voltage lead connector and the low-voltage copper pipe terminal block on the side of the transformer body, which is the length of the low-voltage lead.

5. The method for measuring low-voltage leads of a large power transformer according to claim 4, characterized in that: When the on-site product does not meet the conditions for installing the lower box cover and low-voltage riser, adjust the test assembly according to the relative position of the low-voltage bushing and the low-voltage lead wire connector in the drawing, install the low-voltage lead wire connector on the slide plate (4), and then install the test assembly on the low-voltage copper pipe connector on the side of the device body. The test assembly personnel use a measuring tape to measure the distance between the low-voltage lead wire connector and the low-voltage copper pipe connector on the side of the device body, which is the length of the low-voltage lead wire.

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