A current sampling line shielding structure of SVG

Abstract

The utility model relates to sampling line technical field discloses a current sampling line shielding structure of SVG, including the anti -tensile rib, the outside fixed connection of anti -tensile rib has the inner shielding layer, the outside of inner shielding layer is provided with the conductor, the outside of conductor is provided with the wrapping layer, the outside of wrapping layer is provided with the corrugated shielding layer, the outside of corrugated shielding layer is provided with the partition layer, the outside of partition layer is provided with the copper braid layer, the outside of copper braid layer is provided with the insulating layer, the outside of insulating layer is provided with a plurality of compression ring, the outside of compression ring is commonly provided with the heat insulating layer, in the utility model, the unique design of corrugated shielding layer not only provides the shielding function, and its corrugated structure still like spring, endows the excellent flexibility and the repeated bending resistance of cable, avoids the sampling line to lead to the deformation of shielding structure when bending, leads to the decline of shielding effect.

Description

Technical Field

[0001] This utility model relates to the field of sampling line technology, and in particular to a shielding structure for the current sampling line of an SVG. Background Technology

[0002] In the field of power electronics, static var generators (SVG) are a key reactive power compensation device, and their stable operation depends on accurate and real-time sampling of the grid current. The current sampling line, as the signal transmission channel connecting the current transformer and the control system, directly affects the integrity and accuracy of the sampled signal, thus determining the compensation effect and system stability of the SVG.

[0003] Traditional current sampling lines often employ a single shielding structure, such as a simple metal braid or foil layer, which is insufficient to effectively filter out broadband electromagnetic noise. This leads to interference in the sampled signal, causing control misjudgments. Furthermore, during operation or installation of SVG equipment, the sampling lines may frequently experience various mechanical stresses such as bending, torsion, tension, compression, and friction. If the cable's mechanical strength is insufficient or its fatigue resistance is poor, it can easily lead to internal conductor deformation, shielding damage, or loosening of connections, causing signal attenuation or distortion, and even triggering line faults. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a shielding structure for the current sampling line of an SVG, which prevents deformation of the shielding structure when the sampling line is bent, thus avoiding a decrease in shielding effectiveness.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A shielding structure for an SVG current sampling line includes a tensile rib, an inner shielding layer fixedly connected to the outer side of the tensile rib, a conductor disposed on the outer side of the inner shielding layer, a wrapping layer disposed on the outer side of the conductor, a corrugated shielding layer disposed on the outer side of the wrapping layer, a separating layer disposed on the outer side of the corrugated shielding layer, a copper braided layer disposed on the outer side of the separating layer, and an insulating layer disposed on the outer side of the copper braided layer.

[0006] Furthermore, a plurality of pressure-resistant rings are provided on the outer side of the insulating layer, and a heat-insulating layer is provided on the outer side of the pressure-resistant rings.

[0007] Furthermore, a reinforcing layer is provided on the outer side of the insulation layer.

[0008] Furthermore, the reinforcing layer is internally provided with metal wires.

[0009] Furthermore, a waterproof layer is provided on the outer side of the metal wire.

[0010] Furthermore, an outer protective layer is provided on the outside of the waterproof layer.

[0011] Furthermore, a spiral wear-resistant layer is provided on the outer side of the outer protective layer.

[0012] This utility model has the following beneficial effects: In this invention, a triple shielding structure consisting of an inner shielding layer, a corrugated shielding layer, and a copper braided layer effectively suppresses wideband electromagnetic interference. The unique design of the corrugated shielding layer not only provides shielding functionality, but its corrugated structure also acts like a spring, giving the cable excellent flexibility and resistance to repeated bending, thus preventing deformation of the shielding structure when the sampling line is bent, which would reduce the shielding effect.

[0013] In this invention, the central tensile rib provides excellent tensile strength, preventing the cable from being stretched and deformed during installation or under stress, thus ensuring the electrical stability of the signal transmission path. The annularly distributed pressure-resistant rings and the metal wires in the reinforcing layer together form a distributed pressure-bearing skeleton, which can effectively disperse the impact forces from external squeezing, trampling, etc., and protect the fragile internal conductor and shielding layer from physical damage. Attached Figure Description

[0014] Figure 1 This is an overall schematic diagram of the current sampling line shielding structure of an SVG proposed in this utility model; Figure 2 This is a schematic diagram of the corrugated shielding layer of the current sampling line shielding structure of the SVG proposed in this utility model; Figure 3 This is a schematic diagram of the anti-voltage ring of the current sampling line shielding structure of the SVG proposed in this utility model.

[0015] Legend: 1. Tensile reinforcement strip; 2. Inner shielding layer; 3. Conductor; 4. Wrapping layer; 5. Corrugated shielding layer; 6. Separating layer; 7. Copper braided layer; 8. Insulation layer; 9. Compression ring; 10. Heat insulation layer; 11. Reinforcing layer; 12. Metal wire; 13. Waterproof layer; 14. Outer protective layer; 15. Spiral wear-resistant layer. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Reference Figures 1-3This utility model provides an embodiment of a current sampling line shielding structure for an SVG, comprising a tensile rib 1, an inner shielding layer 2 fixedly connected to the outer side of the tensile rib 1, a conductor 3 disposed on the outer side of the inner shielding layer 2, a wrapping layer 4 disposed on the outer side of the conductor 3, a corrugated shielding layer 5 disposed on the outer side of the wrapping layer 4, a separating layer 6 disposed on the outer side of the corrugated shielding layer 5, a copper braided layer 7 disposed on the outer side of the separating layer 6, an insulating layer 8 disposed on the outer side of the copper braided layer 7, a plurality of pressure-resistant rings 9 disposed on the outer side of the insulating layer 8, a heat insulation layer 10 disposed on the outer side of the pressure-resistant rings 9, a reinforcing layer 11 disposed on the outer side of the heat insulation layer 10, a metal wire 12 disposed inside the reinforcing layer 11, a waterproof layer 13 disposed on the outer side of the metal wire 12, an outer protective layer 14 disposed on the outer side of the waterproof layer 13, and a spiral wear-resistant layer 15 disposed on the outer side of the outer protective layer 14.

[0018] Conductor 3, as the core conductive unit, is responsible for transmitting current signals. Its outer corrugated shielding layer 5 enhances flexibility through its corrugated structure, effectively blocking external high-frequency electromagnetic interference to ensure the purity of the sampling signal. The corrugated structure also increases its resistance to bending. The copper braided layer 7 is isolated from the corrugated shielding layer by the separating layer 6, further absorbing mid-to-low frequency interference and improving the bending resistance of the sampling line. The central tensile rib 1 withstands mechanical tension to prevent cable deformation. The annularly distributed pressure-resistant rings 9 and the metal wires in the reinforcing layer 11 work together to disperse external pressure and impact, avoiding... To prevent signal distortion caused by conductor compression, the spiral wear-resistant layer 15 provides directional wear-resistant protection through spiral winding. It also works with the outer protective layer 14 to maintain cable flexibility and adapt to equipment movement or vibration scenarios. The heat insulation layer 10 blocks the influence of external high temperature or internal heat on the conductor temperature characteristics and maintains sampling accuracy. The waterproof layer 13 adopts a continuous sealing structure to prevent moisture from penetrating into the inner shielding layer and avoids the copper braid layer from oxidizing, which would reduce the shielding effectiveness. The wrapping layer 4 fixes the conductor position, and the separator layer 6 prevents the copper braid layer from contacting the corrugated shielding layer, ensuring that each functional layer works independently.

[0019] When the SVG device is running, the sampling line performs current monitoring in a complex electromagnetic environment. External interference is first physically blocked by the spiral wear-resistant layer 15 and the outer protective layer 14. The remaining interference is filtered out in multiple stages by the copper braided layer 7, the corrugated shielding layer 5 and the inner shielding layer 2. The signal obtained by the conductor 3 is maintained by the tensile reinforcement strip 1 to maintain a stable transmission path and is finally output to the control unit. At the same time, the heat insulation layer 10 and the waterproof layer 13 work together to cope with temperature and humidity fluctuations and ensure long-term stability.

[0020] Working principle: Conductor 3, as the core conductive unit, is responsible for transmitting current signals. Its outer corrugated shielding layer 5 enhances flexibility through its corrugated structure, effectively blocking external high-frequency electromagnetic interference and increasing its bending resistance through its corrugated structure. The copper braided layer 7 is isolated from the corrugated shielding layer through the separating layer 6, further absorbing mid-to-low frequency interference and improving the bending resistance of the sampling line. The central tensile rib 1 withstands mechanical tension to prevent cable deformation. The annularly distributed pressure-resistant rings 9 and the metal wires in the reinforcing layer 11 work together to disperse external pressure and impact, preventing signal distortion caused by conductor compression. The spiral wear-resistant layer 15 provides directional wear-resistant protection through spiral winding.

[0021] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A current sampling line shielding structure for an SVG, characterized in that, It includes a tensile rib (1), an inner shielding layer (2) is fixedly connected to the outside of the tensile rib (1), a conductor (3) is provided on the outside of the inner shielding layer (2), a wrapping layer (4) is provided on the outside of the conductor (3), a corrugated shielding layer (5) is provided on the outside of the wrapping layer (4), a separation layer (6) is provided on the outside of the corrugated shielding layer (5), a copper braided layer (7) is provided on the outside of the separation layer (6), and an insulating layer (8) is provided on the outside of the copper braided layer (7).

2. The current sampling line shielding structure of an SVG according to claim 1, characterized in that: Multiple pressure-resistant rings (9) are provided on the outside of the insulation layer (8), and a heat insulation layer (10) is provided on the outside of the pressure-resistant rings (9).

3. The current sampling line shielding structure of an SVG according to claim 2, characterized in that: A reinforcing layer (11) is provided on the outside of the insulation layer (10).

4. The current sampling line shielding structure of an SVG according to claim 3, characterized in that: The reinforcing layer (11) has metal wires (12) inside.

5. The current sampling line shielding structure of an SVG according to claim 4, characterized in that: A waterproof layer (13) is provided on the outside of the metal wire (12).

6. The current sampling line shielding structure of an SVG according to claim 5, characterized in that: An outer protective layer (14) is provided on the outside of the waterproof layer (13).

7. The current sampling line shielding structure of an SVG according to claim 6, characterized in that: The outer protective layer (14) is provided with a spiral wear-resistant layer (15) on its outer side.

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