Vibrating table testing device for electrical equipment

Abstract

The invention discloses a vibration table test device for electrical equipment. Comprising an insulation platform used for installing electrical equipment, and the insulation platform is installed on a building foundation through a horizontal MTS actuator and a vertical MTS actuator; a gap between the insulating platform and the building foundation is flexibly connected through an aluminum foil; the insulation platform comprises a vibration table, a composite insulation plate is arranged on the upper portion of the vibration table, the composite insulation plate comprises an epoxy glass cloth laminated plate located on the lower layer and a polyether-ether-ketone plate located on the upper layer, and a bottom fixing steel plate used for fixing the electrical equipment is arranged on the composite insulation plate. A speed sensor and an acceleration sensor are fixed to the side edge of the vibration table in a bonding mode. Potential safety hazards such as equipment breakdown and partial discharge are eliminated, and all-around safety guarantee in the testing process is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of seismic testing technology for electrical equipment in building structures, and specifically relates to a shaking table test device for electrical equipment. Background Art

[0002] With higher requirements for the seismic performance of power infrastructure. Therefore, it is urgent to carry out seismic performance tests on electrical equipment, and the demand for an integrated test platform for the whole process of disaster damage evolution of electrical equipment from "mechanical damage" to "electrical damage" is imminent. Most existing shaking table systems adopt a single physical field loading mode. Currently, traditional mechanical shaking table systems are generally used in seismic tests of power infrastructure, and their design is mainly oriented towards the dynamic characteristic testing of conventional structures, and there are significant limitations in simulating the disaster environment under live working conditions.

[0003] Chinese Patent CN118329355A discloses a seismic test device for civil engineering structures and its use method, including a shaking table, an elastic support assembly, a connection assembly, a vibration device, and a test bench with a through hole in the middle; the shaking table is slidably arranged in the middle of the test bench; the elastic support assembly is arranged in the test bench, and the shaking table is arranged on the elastic support assembly for supporting the shaking table and providing a space for the shaking table to vibrate; the connection assembly is slidably arranged on the test bench for clamping the shaking table; the vibration device is arranged below the elastic support assembly and the shaking table for driving the shaking table to vibrate; a plurality of connecting bolts are arranged on the shaking table, and it is convenient to fix a building model through the connecting bolts in cooperation with some connected frames. This patent fixes the shaking table through the connection assembly, which is convenient for installing the building model. However, for the insulation problem of the shaking table test in a high-voltage and large-current environment, this device (including traditional shaking table devices) usually adopts the method of laying insulators to achieve potential isolation. This traditional insulation scheme has significant defects: under the action of long-term high-frequency vibration loads, insulators are prone to generate microcracks and expand, resulting in continuous deterioration of their mechanical properties, seriously threatening the structural safety and stability in dynamic tests.

[0004] Specifically, the metal tabletop of the shaking table needs to be reliably grounded to ensure the stability of the mechanical system, while electrical equipment tests require high-potential isolation, and the two form an irreconcilable contradiction. Although the traditional insulator scheme can provide basic insulation functions, it faces severe challenges in the actual vibration environment - the insulation material will undergo fatigue damage under the action of cyclic mechanical stress, not only greatly reducing the mechanical strength, but also possibly causing sudden fracture, thus destroying the integrity of the test system. The existence of this problem highlights that the existing insulation means cannot meet the dual requirements of long-term stability and safety for electrical equipment vibration tests, and it is urgent to develop new insulation technologies to replace traditional schemes. Summary of the Invention

[0005] Objective of the Invention: The present invention provides a vibration table test device for electrical equipment and its electromagnetic protection device, which constructs a three-dimensional protection system that synergistically combines electric field shielding, current blocking, and equipment grounding. Through the edge extension design of epoxy laminate, the full coverage of the aluminum foil grounding layer, and the optimized configuration of the insulation structure, potential safety hazards such as equipment breakdown and partial discharge are systematically eliminated, achieving all-round safety guarantee during the testing process.

[0006] The above objective is achieved through the following technical solutions: A vibration table test device for electrical equipment and its electromagnetic protection device, including an insulating platform for installing electrical equipment, and the insulating platform is installed on a building foundation through a horizontal MTS actuator and a vertical MTS actuator; the gap between the insulating platform and the building foundation is flexibly connected by aluminum foil. The insulating platform includes a vibration table, a composite insulating board is arranged on the upper part of the vibration table, the composite insulating board includes an epoxy glass cloth laminate located in the lower layer and a polyether ether ketone board located in the upper layer, a bottom fixing steel plate for fixing the electrical equipment is arranged on the composite insulating board, and a velocity sensor and an acceleration sensor are fixed on the side of the vibration table by an adhesive method.

[0007] Furthermore, the composite insulating board is composed of several modules, and a dovetail groove is reserved at the edge of each module, and mechanical assembly connection is realized through the embedding of a double-sided dovetail.

[0008] Furthermore, in the composite insulating board, the designed thickness of the polyether ether ketone board is 60 - 100 mm, the designed thickness of the epoxy glass cloth laminate is 30 - 50 mm, and the thickness ratio of the polyether ether ketone board to the epoxy glass cloth laminate is designed according to a 2:1 thickness ratio; on the upper part of the upper polyether ether ketone board, a trapezoidal corrugated tenon is designed to increase the upper surface area of the composite insulation structure, improve the heat dissipation capacity, and disperse the electric field to reduce the local electric field intensity.

[0009] Furthermore, the layout width of the edge side of the composite insulating board should exceed the width of the vibration table by at least 500 mm.

[0010] Furthermore, a number of lower connection holes of the composite insulating board are arranged on the composite insulating board, a reserved notch is arranged on the lower connection holes of the composite insulating board, and a steel connecting piece is inserted into the lower connection holes of the composite insulating board to be connected with the vibration table; an insulating sleeve is sleeved on the steel connecting piece, and the insulating sleeve is arranged in the reserved notch and coated with an insulating coating on the surface to enhance the insulation performance.

[0011] Further, a number of connection holes are provided on the composite insulating board, and a number of lower connection holes are provided on the bottom fixing steel plate. The bottom fixing steel plate is laid flat on the composite insulating board, and insulating connectors are inserted into the lower connection holes of the bottom fixing steel plate and the connection holes on the composite insulating board for fixation.

[0012] Further, the thread of the insulating connector is a trapezoidal thread.

[0013] Further, a number of reserved bolt holes are provided on the bottom fixing steel plate for fixing the electrical equipment.

[0014] The present invention has the following advantages: 1. In the present invention, an epoxy glass cloth laminate is laid on the upper part of the shaking table as an insulating layer, and a steel plate is further laid on the upper surface of the insulating layer to form an installation platform for the electrical equipment. The insulating connector and the steel connector are used together to fix the installation platform and the insulating layer, so that they are integrated with the shaking table to form a shaking table device with the ability of live test. In this way, problems such as single loading mode of the shaking table, poor dynamic insulation reliability of live test, serious electromagnetic interference under multi-physical field coupling, and contradiction between high-potential isolation and mechanical grounding are solved, and the seismic performance of the electrical equipment from "mechanical damage" to "electrical damage" disaster evolution under real operating conditions is accurately evaluated.

[0015] 2. The wide-width layout of the composite insulating layer of the present invention increases the creepage distance, reduces the electric field strength, makes the distribution of electric field lines more uniform, avoids the excessive concentration of electric field in the edge area, and thus reduces the risk of partial discharge and breakdown. The superposition of the double-layer composite insulating layer further reduces the electric field strength and enhances the insulation performance of the platform. The trapezoidal corrugated tenon design further disperses the electric field and reduces the local electric field strength by increasing the surface area and changing the surface shape, thereby improving the overall insulation strength and safety of the platform.

[0016] 3. The present invention uses trapezoidal-thread insulating connectors to fix the steel plate, and realizes dual-functional optimization through a unique geometric structure design: its involute thread profile can significantly improve the stress distribution state, and at the same time the insulating material characteristics completely block the current conduction path. Compared with the traditional thread structure, this design not only greatly alleviates the stress concentration phenomenon, but also synchronously improves the shear resistance performance, thus effectively overcoming the technical bottleneck of the mechanical-electrical composite failure of the connector under vibration conditions.

[0017] 4. In terms of electromagnetic shielding, an aluminum foil layout scheme combining flexible connection and redundant grounding is adopted, which not only maintains a stable grounding effect, but also adapts to mechanical displacement under vibration scenarios, and significantly improves the environmental adaptability and long-term reliability of the electromagnetic shielding system.

[0018] 5. The overhanging part of the insulating layer where the fixed steel plate layer realizes rapid disassembly, assembly and size expansion through a standardized interface. The modular installation meets diverse test requirements and ensures the structural stability of the equipment installation, greatly improving the versatility and resource utilization rate of the test platform.

[0019] 6. The present invention constructs a three-dimensional protection system with the coordinated action of electric field shielding, current blocking and equipment grounding. Through the edge expansion design of the epoxy laminate, the full coverage of the aluminum foil grounding layer and the optimized configuration of the insulation structure, the system eliminates potential safety hazards such as equipment breakdown and partial discharge, and realizes the full-range safety guarantee during the test process. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the vibration test device for electrical equipment of the present invention; Figure 2 is a front view of the vibration test device for electrical equipment of the present invention; Figure 3 is a side view of the vibration test device for electrical equipment of the present invention; Figure 4 is located at Figure 1 a schematic structural diagram of the platform in; Figure 5 is a connection schematic diagram of the bottom fixed steel plate, insulating layer and vibration table surface of the present invention; Figure 6 is a sectional view of the trapezoidal thread insulating connector of the present invention; In the figure: 1, insulating platform; 2, electrical equipment; 3, aluminum foil; 4, building foundation; 5-1, horizontal MTS actuator; 5-2, vertical MTS actuator; 6, vibration table; 7-1, polyether ether ketone plate; 7-2, epoxy glass cloth laminate; 8, bottom fixed steel plate; 9-1, lower connection hole of composite insulating plate; 9-2, upper connection hole of composite insulating plate; 9-3, lower connection hole of bottom fixed steel plate; 9-4, reserved bolt hole of bottom fixed steel plate; 10, steel connector; 11, insulating connector; 12, insulating sleeve; 13, overhanging part of insulating layer; 14, speed sensor; 15, acceleration sensor; 16, reserved notch; 17, double-sided dovetail; 18, mortise and tenon joint; 19, trapezoidal corrugated tenon. Detailed Embodiments

[0021] The technical solutions of the present invention will be further described below in conjunction with specific examples and drawings. The specific embodiments described herein are only used to explain the relevant content and do not limit the present invention. Additionally, it should be noted that for the sake of convenience of description, only the parts related to the present invention are shown in the drawings.

[0022] In combination with Figure 1 and Figure 2As shown in the figure, the shaking table test device for electrical equipment mainly consists of an insulating platform 1, aluminum foil 3, a building foundation 4, a horizontal MTS actuator 5-1, and a vertical MTS actuator 5-2. Among them, the insulating platform 1 is fixed to the building foundation 4 through the horizontal MTS actuator 5-1 and the vertical MTS actuator 5-2. The aluminum foil 3 is connected to the insulating platform 4 by means of flexible connection and redundant grounding, thereby constructing a shaking table test system that can simultaneously realize earthquake simulation and electromagnetic protection of electrical equipment 2 under live conditions.

[0023] Combined with Figure 3 、 Figure 4 As shown in the figure, the insulating platform 1 includes a shaking table 6. A composite insulating board is arranged on the upper part of the shaking table 6. The composite insulating board includes an epoxy glass cloth laminate 7-1 located in the lower layer and a polyether ether ketone board 7-2 located in the upper layer. A bottom fixing steel plate 8 for fixing the electrical equipment 2 is arranged on the composite insulating board. A velocity sensor 14 and an acceleration sensor 15 are fixed to the side of the shaking table 6 by bonding to detect the vibration parameters of the insulating platform 1. The composite insulating board is composed of several modules. A dovetail groove 18 is reserved at the edge of each module, and mechanical assembly connection is realized by embedding a double-sided dovetail 17. And the layout width of the edge side of the epoxy glass cloth laminate should exceed the width of the shaking table by at least 500 mm. On this basis, a certain number of bottom fixing steel plates 8 are laid according to the size of the measured electrical equipment 2. On the upper part of the upper polyether ether ketone board 7-2, trapezoidal corrugated tenons 19 are designed to increase the upper surface area of the composite insulating structure, improve the heat dissipation capacity, and disperse the electric field to reduce the local electric field intensity.

[0024] Combined with Figure 4 、 Figure 5 As shown in the figure, when the epoxy glass cloth laminate 7-1 and the polyether ether ketone board 7-2 are connected to the shaking table 6, first, they are positioned with the table surface through the connection holes 9-1. After the steel connector 10 is inserted, insulating sleeves 12 are arranged in the reserved slots 16. The length of the insulating sleeves needs to exceed 50 mm. It can be designed in the form of bolts, and the size should be in close contact with the reserved pores of the epoxy glass cloth laminate to form a current isolation path, which not only ensures the installation stability but also blocks the test current from being conducted to the shaking table body through the steel connector. When necessary, insulating paint can be applied to the connection surface between the insulating sleeve and the epoxy glass cloth laminate to enhance the insulation performance. Subsequently, through the positioning of the trapezoidal corrugated tenons 19, the bottom fixing steel plate 8 is laid flat on the composite insulating board, and insulating connectors 11 are inserted into the connection holes 9-3 under the bottom fixing steel plate and the connection holes 9-2 on the composite insulating board. It should be noted that to prevent stress concentration, the thread of the insulating connector is a trapezoidal thread. Finally, the electrical equipment is fixed to the insulating platform 1 through the reserved bolt holes 9-4 of the bottom fixing steel plate.

[0025] Figure 6It is the cross-section of a trapezoidal thread. The dimensional parameter expressions of the trapezoidal thread are respectively,, ω = 0.634P. Where d is the major diameter of the external thread of the bolt, P is the pitch of the thread, ω is the width of the trapezoidal thread tooth, L is the width of the bottom of the trapezoidal thread tooth, h is the height of the trapezoidal thread tooth, and ac is the assembly clearance of the designed tooth profile.

[0026] The electromagnetic protection mechanism of the present invention lies in: through the adaptive mortise and tenon connection design of the composite insulating board, combined with the insulating sleeve and the trapezoidal thread insulating connector to block the current path, its ultra-wide edge laying, trapezoidal corrugated insulating layer structure and insulating paint coating further strengthen the dielectric isolation between the tabletop and the equipment, and the flexible grounding of the aluminum foil provides redundant electromagnetic shielding, so as to synchronously suppress electromagnetic interference during the vibration transmission process.

Claims

1. A vibration table test device for electrical equipment, characterized in that, It includes an insulating platform (1) for installing an electrical device (2), and the insulating platform (1) is installed on a building foundation (4) through a horizontal MTS actuator (5-1) and a vertical MTS actuator (5-2); the gap between the insulating platform (1) and the building foundation (4) is flexibly connected through an aluminum foil (3). The insulating platform (1) includes a vibration table (6), a composite insulating board is arranged on the upper part of the vibration table (6), the composite insulating board includes an epoxy glass cloth laminate (7-1) located at the lower layer and a polyether ether ketone board (7-2) located at the upper layer, a bottom fixing steel plate (8) for fixing the electrical device (2) is arranged on the composite insulating board, and a speed sensor (14) and an acceleration sensor (15) are fixed on the side of the vibration table (6) by an adhesive method.

2. The vibration table test device for electrical equipment according to claim 1, characterized in that The composite insulating board is composed of several modules, and a dovetail groove (18) is reserved at the edge of each module, and mechanical assembly connection is realized by embedding a double-sided dovetail (17).

3. The vibration table test device for electrical equipment according to claim 1 or 2, characterized in that, In the composite insulating board, the designed thickness of the polyether ether ketone board (7-2) is 60-100 mm, and the designed thickness of the epoxy glass cloth laminate (7-1) is 30-50 mm. The thickness ratio of the polyether ether ketone board (7-2) to the epoxy glass cloth laminate (7-1) is designed according to a thickness ratio of 2:1; on the upper part of the upper polyether ether ketone board (7-2), a trapezoidal corrugated tenon (19) is designed to increase the upper surface area of the composite insulating structure, improve the heat dissipation capacity, and disperse the electric field to reduce the local electric field strength.

4. A vibration table test device for electrical equipment according to claim 1 or 2, characterized in that The layout width of the edge side of the composite insulating board should exceed the width of the vibration table (6) by at least 500 mm.

5. The vibration table test device for electrical equipment according to claim 1 or 2, characterized in that, A number of lower connection holes (9-1) of the composite insulating board are arranged on the composite insulating board, a reserved notch (16) is arranged on the lower connection holes (9-1) of the composite insulating board, and a steel connecting piece (10) is inserted into the lower connection holes (9-1) of the composite insulating board to be connected with the vibration table (6); an insulating sleeve (12) is sleeved on the steel connecting piece (10), and the insulating sleeve (12) is arranged in the reserved notch (16) and an insulating coating is applied on the surface to enhance the insulation performance.

6. The vibration table test device for electrical equipment according to claim 1 or 2, characterized in that, A number of upper connection holes (9-2) of the composite insulating board are arranged on the composite insulating board, a number of lower connection holes (9-3) of the bottom fixing steel plate are arranged on the bottom fixing steel plate (8), the bottom fixing steel plate (8) is laid flat on the composite insulating board, and an insulating connecting piece (11) is inserted into the lower connection holes (9-3) of the bottom fixing steel plate and the upper connection holes (9-2) of the composite insulating board for fixation.

7. The vibration table test device for electrical equipment according to claim 6, characterized in that The thread of the insulating connecting piece (11) is a trapezoidal thread.

8. A vibration table test device for electrical equipment according to claim 1 or 2, characterized in that A number of reserved bolt holes (9-4) of the bottom fixing steel plate are arranged on the bottom fixing steel plate (8) for fixing the electrical device (2).

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