Grounding system of wind tunnel test equipment

Abstract

The utility model relates to a grounding system of wind tunnel test equipment. The grounding system comprises a building combined grounding body; the test equipment grounding grid and the building combined grounding body are arranged at an interval; the measurement and control total grounding terminal box is electrically connected with the test equipment grounding grid through a first shielding armored cable; the plurality of measurement and control signal point grounding terminal boxes are connected with the measurement and control total grounding terminal box through second shielding armored cables; the shielding layer and the armor layer of the first shielding armored cable and the second shielding armored cable are both in bridge connection with the building grounding body. According to the utility model, the reliability of the reference potential is effectively improved, the precision and accuracy of test data are greatly improved, the system structure is simple, the use is convenient, the signal grounding requirement during the movement of test equipment is greatly met, and the anti-interference performance is good.

Description

Technical Field

[0001] This utility model relates to the field of power equipment grounding technology, and in particular to a grounding system for wind tunnel testing equipment. Background Technology

[0002] With the development of science and technology, the requirements for electrical safety of electrical equipment are becoming increasingly stringent. Electrical equipment typically has three contacts: a live wire, a neutral wire, and a ground wire. The ground wire, short for grounding device, is a conductor in a power system or electronic equipment that connects to the earth, the casing, or a reference potential of zero. Grounding wires primarily serve a safety function, diverting current to the earth to prevent electric shock, provide lightning protection, protect electrical equipment, and ensure the normal operation of machinery.

[0003] With the development of global aerospace, wind tunnel testing equipment, as a fundamental aerodynamic research field, has also seen significant advancements. my country has also constructed numerous wind tunnel facilities in recent years. To simulate the aerodynamic parameters of actual spacecraft and aircraft in flow fields, the testing and simulation equipment is numerous and dispersed, with complex power line wiring and a highly complex electromagnetic environment. Due to the dispersed nature of the testing equipment and the complexity of the testing environment, interference sources are complex, and the signal reference potential is unstable, severely affecting the accuracy of test data. Currently, the simple signal grounding systems of domestic wind tunnel equipment are insufficient to address the problem of unsatisfactory signal reference potentials. Utility Model Content

[0004] To address the technical problems existing in the prior art, the purpose of this utility model is to provide a grounding system for wind tunnel testing equipment. This system uses an independent grounding network for the testing equipment, separate from the building's combined grounding system. The grounding lead-in line uses a shielded armored copper cable, which is physically isolated from the building's steel reinforcement and other metal components and equipment. This avoids interference from strong and weak electromagnetic fields within the building from the source of the grounding system, greatly improving the reliability of the testing equipment's signal reference potential.

[0005] To achieve the above objectives, this utility model provides a grounding system for a wind tunnel testing device, comprising:

[0006] Building grounding electrode;

[0007] The grounding grid for the test equipment is spaced apart from the joint grounding electrode of the building.

[0008] The main grounding terminal box for measurement and control is electrically connected to the grounding grid of the test equipment via a first shielded armored cable.

[0009] Several grounding terminal boxes for measurement and control signal points are connected to the main grounding terminal box for measurement and control via a second shielded armored cable;

[0010] The shielding layer and armor layer of both the first shielded armored cable and the second shielded armored cable are connected to the grounding electrode of the building.

[0011] According to one technical solution of this utility model, the grounding grid of the test equipment includes several grounding units, each of the grounding units includes a closed grid-shaped horizontal connector and a vertical direct ground electrode, the vertical direct ground electrode is electrically connected to the horizontal connector, and the several horizontal connectors form a mesh structure.

[0012] According to one technical solution of this utility model, the interval between any two vertical direct ground electrodes is at least 10 meters, and any vertical direct ground electrode is set vertically with a burial depth of not less than 0.8 meters.

[0013] According to one technical solution of this utility model, the vertical anchor is a copper-clad steel metal body with a diameter greater than or equal to 16 mm and a length greater than or equal to 2.5 m.

[0014] According to one technical solution of this utility model, the first shielded armored cable is a shielded armored copper cable with a cross-sectional area greater than or equal to 120 square millimeters.

[0015] The second shielded armored cable is a shielded armored copper cable with a cross-sectional area of ​​70 square millimeters or more.

[0016] According to one technical solution of this utility model, a plastic tube is provided on the outer surface of the first shielded armored cable.

[0017] According to one technical solution of this utility model, the nearest horizontal distance between the grounding grid of the test equipment and the joint grounding body of the building is not less than 10 meters.

[0018] According to one technical solution of this utility model, the grounding grid of the test equipment is made of copper-clad steel material, and its grounding resistance is not greater than 0.1 ohms.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] In response to existing technologies, this utility model proposes a grounding system for wind tunnel testing equipment. It adopts an independent grounding network for the testing equipment, separate from the building's joint grounding body, forming a closed grounding network for the testing equipment's signal circuit. The grounding lead-in line adopts a shielded armored method such as open-laid plastic pipe, which is physically isolated from the building's steel bars and other metal components. This avoids interference from strong and weak electromagnetic fields within the building from the source of the grounding system, greatly improving the reliability of the testing equipment's signal reference potential, and reducing the signal grounding resistance value and shielding grounding interference.

[0021] The grounding terminal box for test equipment signal grounding effectively solves the problem of signal reference potential drift in test equipment, improves the reliability of the reference potential, greatly improves the accuracy and precision of test data, has a simple system structure, is easy to use, greatly meets the signal grounding requirements when test equipment is moved, and has good anti-interference performance. Attached Figure Description

[0022] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the embodiments 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 any creative effort.

[0023] Figure 1 This diagram illustrates the grounding system of the wind tunnel testing equipment of this invention.

[0024] Figure 2 Schematic representation Figure 1 Enlarged diagram of point A in the middle.

[0025] in, Figures 1 to 2 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0026] 1-Horizontal connector; 2-Vertical ground electrode; 3-Grounding well; 4-First shielded armored cable; 5-Test equipment grounding grid; 6-Building combined grounding body; 7-Measurement and control main grounding terminal box; 8-Second shielded armored cable; 9-Measurement and control signal point grounding terminal box. Detailed Implementation

[0027] The description of the embodiments in this specification should be taken in conjunction with the accompanying drawings, which should form part of the complete specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and may be indicated in a simplified or convenient manner. Furthermore, parts of the various structures in the drawings will be described separately; it is worth noting that elements not shown in the figures or not described in words are in a form known to those skilled in the art.

[0028] The description of the embodiments herein, including any references to direction and orientation, is for ease of description only and should not be construed as limiting the scope of protection of this utility model. The following description of preferred embodiments involves combinations of features, which may exist independently or in combination; this utility model is not particularly limited to the preferred embodiments. The scope of this utility model is defined by the claims.

[0029] like Figures 1-2As shown, this utility model proposes a grounding system for wind tunnel testing equipment, including: a grounding grid for the testing equipment 5, a combined grounding body for the building 6, and a main grounding terminal box for measurement and control 7.

[0030] The grounding grid 5 of the test equipment is installed underground and is dedicated to the use of the test equipment to ensure the stability of the reference potential of the test equipment and the accuracy of the test data.

[0031] The building grounding electrode 6 is used to ground other electrical equipment and lightning protection equipment in the building. It is set at a minimum horizontal distance of 10 meters from the grounding network 5 of the test equipment to prevent mutual interference between the building grounding electrode 6 and the grounding network 5 of the test equipment.

[0032] The grounding wires of each piece of equipment or equipment in each area are uniformly connected to a single grounding terminal box 9 for monitoring and control signal points. Several grounding terminal boxes 9 for monitoring and control signal points are connected to a main grounding terminal box 7 for monitoring and control via a second shielded armored cable 8. The main grounding terminal box 7 for monitoring and control is electrically connected to the grounding grid 5 of the test equipment via a first shielded armored cable 4, ensuring that the grounding potential of each piece of test equipment is consistent. The shielding layer and armor layer of both the first shielded armored cable 4 and the second shielded armored cable 8 are connected across the building's grounding electrode to prevent leakage and ensure safety.

[0033] The first shielded armored cable 4 is a shielded armored copper cable with a cross-sectional area of ​​120 square millimeters or more, and a plastic tube is provided on the outer surface of the first shielded armored cable 4.

[0034] The second shielded armored cable 8 is a shielded armored copper cable with a cross-sectional area of ​​70 square millimeters or more.

[0035] The grounding grid 5 of the test equipment includes several grounding units and grounding wells 3. Each grounding unit includes a closed grid-shaped horizontal connector 1 and a vertical direct ground electrode 2. The vertical direct ground electrode 2 is electrically connected to the horizontal connector 1, and the several horizontal connectors 1 form a mesh structure. The interval between any two vertical direct ground electrodes 2 is at least 10 meters. Any vertical direct ground electrode 2 is set vertically, with a burial depth of not less than 0.8 meters and a length of 2.5 meters.

[0036] Both the vertical ground electrode 2 and the horizontal connector 1 are made of Φ16 copper-clad steel.

[0037] The grounding resistance of grounding grid 5 of the test equipment is not greater than 0.1 ohms.

[0038] This invention proposes an innovative grounding system for wind tunnel testing equipment. This system establishes a closed signal circuit grounding network by setting up an independent grounding network 5 for the testing equipment, separate from the building's combined grounding electrode 6. For the grounding lead-in cable 4, the system employs open-laid plastic conduit and shielding armor technology to ensure physical isolation from the building's reinforcing steel and other metal components. This design fundamentally avoids strong and weak electromagnetic interference within the building, significantly improves the stability of the testing equipment's signal reference potential, and simultaneously reduces signal grounding resistance and shielding grounding interference.

[0039] In addition, this system is equipped with a dedicated main grounding terminal box 8 and a main grounding terminal box 9 for the test equipment signal grounding. The grounding wires of the test equipment in different areas are first connected to the main grounding terminal box 9, and multiple main grounding terminal boxes 9 are then connected to the main grounding terminal box 8, effectively solving the problem of signal reference potential drift during testing. This not only improves the reliability of the reference potential but also greatly enhances the accuracy and precision of the test data. The system has a simple structure, is easy to operate, fully meets the stringent requirements for signal grounding during the movement of test equipment, and possesses excellent anti-interference performance.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A grounding system for a wind tunnel testing device, characterized in that, include: Building grounding electrode (6); The grounding grid (5) of the test equipment is spaced apart from the joint grounding electrode (6) of the building; The main grounding terminal box (7) for measurement and control is electrically connected to the grounding grid (5) of the test equipment via the first shielded armored cable (4); Several grounding terminal boxes (9) for measurement and control signal points are connected to the main grounding terminal box (7) for measurement and control via a second shielded armored cable (8); The shielding layer and armor layer of the first shielded armored cable (4) and the second shielded armored cable (8) are both connected to the grounding body of the building.

2. The grounding system according to claim 1, characterized in that, The grounding grid (5) of the test equipment includes several grounding units. Each grounding unit includes a closed grid-shaped horizontal connector (1) and a vertical direct ground electrode (2). The vertical direct ground electrode (2) is electrically connected to the horizontal connector (1). Several horizontal connectors (1) form a mesh structure.

3. The grounding system according to claim 2, characterized in that, The interval between any two vertical direct ground poles (2) is at least 10 meters, and any vertical direct ground pole (2) is set vertically with a burial depth of not less than 0.8 meters.

4. The grounding system according to claim 2, characterized in that, The vertical direct grounding electrode (2) is a copper-clad steel metal body with a diameter greater than or equal to 16 mm and a length greater than or equal to 2.5 m.

5. The grounding system according to claim 1, characterized in that, The first shielded armored cable (4) is a shielded armored copper cable with a cross-sectional area greater than or equal to 120 square millimeters; The second shielded armored cable (8) is a shielded armored copper cable with a cross-sectional area of ​​70 square millimeters or more.

6. The grounding system according to claim 1, characterized in that, A plastic tube is provided on the outer surface of the first shielded armored cable (4).

7. The grounding system according to claim 1, characterized in that, The nearest horizontal distance between the grounding grid (5) of the test equipment and the joint grounding electrode (6) of the building shall not be less than 10 meters.

8. The grounding system according to claim 1, characterized in that, The grounding grid (5) of the test equipment is made of copper-clad steel and its grounding resistance is not greater than 0.1 ohms.

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