Bottom plate load measuring device of mutual inductor for medium-voltage metering

Abstract

The invention relates to a base plate load measuring device of a mutual inductor for medium-voltage metering. The base plate load measuring device comprises a pedestal; the three-dimensional turnover table top comprises a bottom plate and a carrier plate, and the bottom plate is rotationally connected with the table base through a first rotating shaft, so that the bottom plate can vertically turn over around the first rotating shaft relative to the table base; the carrier plate is coaxially connected with the bottom plate through a second rotating shaft, so that the carrier plate can horizontally rotate around the second rotating shaft relative to the bottom plate; a tension mechanism; and the control mechanism is used for controlling the overturning and rotating actions of the three-dimensional overturning table board and controlling the tension mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer testing, and in particular relates to a bottom plate load measuring device of a transformer for medium voltage metering. Background Art

[0002] Medium-voltage instrument transformers (MTs) are critical equipment for energy metering in power systems. Their accuracy and reliable operation are directly linked to the fairness and justice of electricity trade settlements and the safety of power grid usage. They are widely used in distribution networks, with large annual procurement volumes and a wide variety of models and specifications. However, the quality of MTs currently on the market varies widely, leading to high failure rates and even explosions and combustion in actual operation. Therefore, rigorous full-performance testing of MTs entering the grid to ensure that their metering and insulation performance meet standards is crucial for ensuring safe and stable power grid operation.

[0003] According to relevant regulations, the baseplates of medium-voltage metering transformers are subject to load testing to verify their structural strength and stability. Specific test requirements typically include securing the transformer mounting baseplate and applying a specified sustained force to the center of the transformer body, both horizontally and vertically relative to the baseplate. For example, a force of 1000N is applied to a 10kV transformer, 2000N to a 20kV transformer, and 3000N to a 35kV transformer, for one minute. The specimen must not exhibit any deformation or breakage.

[0004] However, the solutions used in the prior art for transformer baseplate load testing have many limitations. For example, the existing tension application method is usually difficult to meet the tension requirements in both the horizontal and vertical directions at the same time, and it is often necessary to relocate the equipment or use additional equipment to switch the loading direction. In addition, the existing test equipment has shortcomings in fixing the tested medium-voltage metering transformer, making it difficult to ensure that the transformer is stable and reliable during the stress process. At the same time, the existing chassis or fixed tooling is also difficult to adapt to medium-voltage metering transformer baseplates with different mounting holes and various specifications, resulting in poor versatility of the equipment. Each time the tested transformer is replaced, a lot of time is required for adaptation and adjustment.

[0005] Due to the above limitations, existing baseplate load tests are difficult, inefficient, and may increase safety risks during the test, especially when frequent manual adjustments of the equipment or the position of the tested transformer are required.

[0006] Therefore, there is an urgent need for a medium-voltage metering transformer baseplate load measurement device with high integration, high test efficiency, high degree of automation, small footprint, convenient operation, and low safety risk, so as to overcome the shortcomings of existing technologies and meet the requirements of regulatory tests. Summary of the Invention Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the objects of the present invention is to at least solve one or more of the above-mentioned problems in the prior art, or to provide a base plate load measuring device for a medium voltage metering transformer that meets one or more of the above-mentioned needs.

[0007] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a base plate load measuring device for a medium voltage metering transformer, comprising: pedestal; The three-dimensional flip table includes a base plate and a carrier plate. The base plate and the base are rotatably connected by a first rotating shaft, so that the base plate can be vertically flipped relative to the base around the first rotating shaft; the carrier plate and the base plate are coaxially connected by a second rotating shaft, so that the carrier plate can be horizontally rotated relative to the base plate around the second rotating shaft; the first rotating shaft and the second rotating shaft are orthogonal to each other; a plurality of mutual inductor fixing holes are provided on the carrier plate; A pulling mechanism is provided with a pulling rope for applying pulling force to the mutual inductor mounted on the carrier plate; The control mechanism is electrically connected to the three-dimensional flip table and the tension mechanism, and is used to control the flipping and rotation of the three-dimensional flip table, and to control the tension applying action of the tension mechanism and record the tension data of the tension mechanism.

[0008] As a preferred embodiment, the transformer fixing holes on the carrier plate are adapted to medium voltage transformers of various specifications. As a preferred embodiment, the tension range of the tension mechanism is 0-6 kN, and the displacement range is 0-500 mm.

[0009] As a preferred embodiment, the base plate can be switched between a horizontal position and a 90-degree flip toward the tension mechanism.

[0010] As a preferred embodiment, the pull rope is a steel wire rope, and lock buckles for connecting with the tension mechanism are respectively provided at multiple different positions.

[0011] As a preferred embodiment, a sleeve rod is provided at the bottom of the base plate, and the other end of the sleeve rod is connected to the base for supporting the base plate.

[0012] As a preferred embodiment, the control mechanism is provided with an RS485 interface.

[0013] As a preferred embodiment, the control mechanism further has a display screen for drawing a tension curve.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The three-dimensional flip table of the baseplate load measurement device for medium-voltage metering transformers of the present invention comprises a baseplate and a carrier plate. The baseplate can be flipped vertically relative to the baseplate, while the carrier plate can be rotated horizontally relative to the baseplate, with the first and second rotation axes being orthogonal to each other. This structure allows the transformer mounted on the carrier plate to easily achieve horizontal and vertical posture transitions. In conjunction with a tension mechanism, a single tension source is required to apply both horizontal and vertical tension to the transformer baseplate, fully meeting regulatory test requirements and avoiding the complexity and inefficiency of switching tension directions in traditional solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 2 is a schematic structural diagram of a base plate load measuring device for a medium voltage metering transformer according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the connection structure of the metering test vehicle when calibrating the power current transformer; Figure 3 This is a schematic diagram of the connection between the system of an embodiment of the present application and the current load box under test during calibration. Reference numerals: pedestal-1, three-dimensional flip table-2, bottom plate-21, carrier plate-22, sleeve rod-23, medium voltage transformer-3, tension mechanism-4, control mechanism-5, pull rope-51. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0017] Specific embodiments of the present invention are described below with reference to the accompanying drawings. The following description, with reference to the accompanying drawings, is provided to aid understanding of example embodiments of the present invention as defined by the claims and their equivalents. Various specific details are included to aid understanding, but they are to be considered as illustrative only. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Furthermore, for clarity and brevity, detailed descriptions of functions and configurations well known in the art may be omitted.

[0018] The present invention provides a bottom plate load measuring device for a medium voltage metering transformer, the structural diagram of which is shown in FIG. Figure 1 Shown, including: The base 1 serves as a supporting frame for the entire device and is used to stably place the three-dimensional flip table 2, the tension mechanism 4, the control mechanism 5 and the medium voltage transformer 3 to be tested.

[0019] The three-dimensional flip table 2 is set on the top of the pedestal 1, used to place the medium-voltage transformer 3 under test and realize automatic adjustment of its three-dimensional posture, thereby changing the relative angle between the tension direction and the bottom plate of the transformer under test to meet the test requirements of applying tension in both horizontal and vertical directions on the bottom plate of the transformer. The three-dimensional flip table 2 mainly includes a bottom plate 21 and a carrier plate 22.

[0020] Among them, Figure 2 and Figure 3 As shown, the base plate 21 is rotatably connected to the base 1 via a first rotating shaft, which is horizontally arranged at the top of the base 1. This first rotating shaft allows the base plate 21 to be vertically flipped about the first rotating shaft relative to the base 1, thereby switching between horizontal and vertical positions. Specifically, the base plate 21 can automatically switch between a horizontal position and a 90-degree flip toward the tension mechanism 4, thereby applying loads to the base plate of the transformer under test in both horizontal and vertical directions.

[0021] The carrier plate 22 is mounted parallel to the base plate 21 and is rotatably connected to the base plate 21 via a second rotational axis. The carrier plate 22 is coaxially connected to the base plate 21 via the second rotational axis. The first and second rotational axes are orthogonal to each other. Therefore, the combination of vertical flipping of the base plate and horizontal rotation of the carrier plate allows the medium-voltage transformer 3 under test (MVTI) 3, which is fixed to the carrier plate 22, to be rotated 360 degrees. This allows for flexible adjustment of the force applied to the transformer, thereby applying tension both horizontally and vertically to the base plate of the transformer under test.

[0022] A sleeve rod 23 is provided at the bottom of the base plate 21. One end of the sleeve rod 23 supports the bottom of the base plate 21 from below, and the other end is connected to the base 1. The sleeve rod 23 is connected to the base plate 21 and the base 1 by rotation, and the sleeve rod 23 has a telescopic function to ensure that it can always provide stable support for the base plate 21 when the base plate 21 is flipped vertically, thereby enhancing the overall stability of the device.

[0023] The carrier plate 22 is equipped with multiple mounting holes for transformers. These holes are arranged in groups to accommodate mounting bases for medium-voltage metering transformers of varying specifications. Specifically, there are preferably no fewer than three mounting holes. When replacing a medium-voltage transformer 3 of varying specifications, the operator simply selects and uses the corresponding mounting holes on the carrier plate 22 for convenient and reliable fixation. Furthermore, the three-dimensional flip table 2 has a load capacity of no less than 500 kg to accommodate transformers of varying weights.

[0024] The pedestal 1 is also equipped with a tensioning mechanism 4, which is mounted horizontally on the pedestal 1. The tensioning mechanism 4 has a hook connected to a pull rope 51 and faces the three-dimensional flip table 2. This hook can apply a specified tension to the medium-voltage transformer 3 under test, which is mounted on the three-dimensional flip table 2. The tensioning mechanism 4 can output varying tensions, preferably ranging from 0 to 6 kN and from 0 to 500 mm, to meet the requirements of different test loads and displacements.

[0025] The pedestal 1 is also equipped with a control mechanism 5. This mechanism is electrically connected to the three-dimensional flip table 2 and the tension mechanism 4 and is used to automatically control the entire test process. Specifically, the control mechanism 5 controls the flipping and rotation of the three-dimensional flip table 2, as well as the tension output and application of the tension mechanism 4. Furthermore, the control mechanism 5 also has the functions of measuring tension, measuring the time of tension application, and plotting a tension-time curve. The control mechanism 5 has an RS485 interface, which allows data transmission via the standard ModBus protocol. This facilitates communication and data exchange with external systems, improving the device's automation level and test efficiency.

[0026] In a further improved embodiment, the control mechanism 5 also has a display screen for displaying test data in real time and can draw a tension curve to intuitively display the tension change process, which is convenient for operators to monitor and analyze.

[0027] In a further improved embodiment, the pull rope 51 is a steel wire rope with low elasticity to ensure accurate tension transmission. The pull rope 51 is equipped with locks for hooking with the tension mechanism 4 at multiple locations along its length. This multi-lock design allows the operator to select the most appropriate lock position for hooking with the tension mechanism 4 based on the actual size of the medium-voltage transformer 3 under test and the distance from the tension application point. This allows precise adjustment of the desired length of the pull rope 51, effectively reducing the operating stroke of the tension mechanism 4 and further optimizing the overall size and operating efficiency of the device.

[0028] The bottom plate load measuring device of the medium voltage metering transformer 3 of this embodiment is used in the following way: According to the installation hole position of the bottom plate of the tested medium-voltage transformer 3, the corresponding transformer fixing hole on the carrier plate 22 is selected, and the tested medium-voltage transformer 3 is firmly fixed on the carrier plate 22 using fasteners such as bolts to ensure that its position will not shift when tension is applied. At this time, the bottom plate 21 of the three-dimensional flip table 2 is in a horizontal position through the control mechanism 5.

[0029] Then, connect one end of the pull rope 51 to the force application point of the medium-voltage transformer 3 under test, and the other end to the hook of the tension mechanism 4 through the lock on the pull rope 51. According to the size of the medium-voltage transformer 3 under test and the location of the force application point, select an appropriate lock to ensure that the pull rope 51 is of appropriate length, reduce the operating stroke of the tension mechanism 4, and ensure that the direction of tension application is level with the transformer base plane.

[0030] The required horizontal tension value and duration are set through the control mechanism 5, and the control mechanism 5 automatically controls the tension mechanism 4 to apply the set horizontal tension. During this process, the control mechanism 5 collects the tension sensor data of the tension mechanism 4 in real time for measurement, and starts measuring the time of tension application, completing the measurement of the base plate load when tension is applied in the vertical state.

[0031] After completing the horizontal test, the control mechanism 5 issues a command to vertically flip the bottom plate 21 of the three-dimensional flip table 2. The bottom plate 21 automatically rotates 90 degrees around the first rotation axis, so that the bottom plate of the medium-voltage transformer 3 under test transitions from a horizontal state to a vertical state, facing the tension mechanism 4. During this flipping process, the sleeve rods 23 at the bottom of the bottom plate 21 automatically extend and rotate, providing continuous stable support for the bottom plate 21.

[0032] Next, the desired vertical tension value and duration are set again through control mechanism 5, which automatically controls tension mechanism 4 to apply the set vertical tension. Similarly, control mechanism 5 collects tension data in real time, measures time, and plots a tension-time curve, completing the measurement of the baseplate load when tension is applied in the vertical state. Furthermore, in addition to the two primary horizontal and vertical directions, the device can also measure the baseplate load when tension is applied to the transformer from any horizontal angle, thanks to the carrier's 360-degree horizontal rotation capability.

[0033] The three-dimensional flip table of the baseplate load measurement device for medium-voltage metering transformers of the present invention comprises a baseplate and a carrier plate. The baseplate can be flipped vertically relative to the baseplate, while the carrier plate can be rotated horizontally relative to the baseplate, with the first and second rotation axes being orthogonal to each other. This structure allows the transformer mounted on the carrier plate to easily achieve horizontal and vertical posture transitions. In conjunction with a tension mechanism, a single tension source is required to apply both horizontal and vertical tension to the transformer baseplate, fully meeting regulatory test requirements and avoiding the complexity and inefficiency of switching tension directions in traditional solutions.

[0034] The above description is only an exemplary embodiment of the present disclosure and is not intended to limit the scope of the present disclosure. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure herein, those skilled in the art will easily think of the implementation scheme of the present disclosure. This application is intended to cover any variation, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not recorded in the present disclosure. The description and examples are to be regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

Claims

1. A base plate load measuring device for a medium voltage metering transformer, characterized in that: include: pedestal; A three-dimensional flip table comprises a base plate and a carrier plate, wherein the base plate is rotatably connected to the base via a first rotation axis, so that the base plate can be vertically flipped relative to the base around the first rotation axis; the carrier plate is coaxially connected to the base plate via a second rotation axis, so that the carrier plate can be horizontally rotated relative to the base plate around the second rotation axis; the first rotation axis and the second rotation axis are orthogonal to each other; and a plurality of mutual inductor fixing holes are provided on the carrier plate; A pulling mechanism, wherein the pulling mechanism is provided with a pulling rope for applying a pulling force to the mutual inductor mounted on the carrier plate; The control mechanism is electrically connected to the three-dimensional flip table and the tension mechanism, and is used to control the flipping and rotation of the three-dimensional flip table, and to control the tension applying action of the tension mechanism and record the tension data of the tension mechanism.

2. The bottom plate load measuring device of a medium voltage metering transformer according to claim 1, characterized in that: The mutual inductor fixing holes on the carrier plate are adapted to medium voltage mutual inductors of various specifications.

3. The bottom plate load measuring device of a medium voltage metering transformer according to claim 1, characterized in that: The tension range of the tension mechanism is 0-6kN, and the displacement range is 0-500mm.

4. The bottom plate load measuring device for a medium voltage metering transformer according to claim 1, characterized in that: The bottom plate can be switched between a horizontal position and a 90-degree flip toward the pulling mechanism.

5. The bottom plate load measuring device for a medium voltage metering transformer according to claim 1, characterized in that: The pull rope is a steel wire rope, and lock buckles for connecting with the pulling mechanism are respectively provided at multiple different positions.

6. The bottom plate load measuring device for a medium voltage metering transformer according to claim 1, characterized in that: A sleeve rod is provided at the bottom of the base plate, and the other end of the sleeve rod is connected to the base for supporting the base plate.

7. The bottom plate load measuring device for a medium voltage metering transformer according to claim 1, characterized in that: The control mechanism is provided with an RS485 interface.

8. The bottom plate load measuring device for a medium voltage metering transformer according to claim 1, characterized in that: The control mechanism also has a display screen and is used for drawing a tension curve.

Images