A power taking coil structure suitable for low load line

Abstract

The utility model belongs to the coupling energy extraction technical field of transmission overhead line online class monitoring device, concretely is a kind of energy extraction coil structure suitable for low load line.A kind of energy extraction coil structure suitable for low load line, its annular core includes upper, middle, lower three core layers, wherein the bottom surface of upper core layer and the top surface of lower core layer all have protruding arc strip, the top surface and bottom surface of middle core layer all have recessed arc groove, when upper core layer, middle core layer and lower core layer splice, arc strip and arc groove are mutually aligned, for limiting the position of each core layer, ensure that core layer inner and outer edge mutually align, avoid magnetic loss.The utility model adopts upper, middle, lower three core layers, increase the core magnetic circuit, thickness, width to some extent, improve the effect of magnetic aggregation, more suitable in low load overhead line.

Description

Technical Field

[0001] This utility model belongs to the field of coupled energy harvesting technology for online monitoring devices of overhead power transmission lines, specifically an energy harvesting coil structure suitable for low-load lines. Background Technology

[0002] Transmission lines are erected in the field, and various online monitoring devices are installed on their conductors, such as fault location devices, icing monitoring devices, and sag monitoring devices. These devices typically use coupled energy harvesting to maintain the continuous operation of the equipment hardware. Existing energy harvesting coils usually employ a method of directly winding coils around a toroidal iron core, such as... Figure 1 As shown, this type of energy harvesting coil has two main problems: First, its magnetic focusing ability is low. Due to the unstable load current of overhead lines, most energy harvesting coils cannot couple sufficient induced voltage to power the equipment when used on low-load lines. Second, most energy harvesting coils are designed with an openable / closeable structure, which easily causes magnetic leakage at the opening / closing section, increasing magnetic energy loss and significantly reducing the output power of the energy harvesting coil. These two problems directly affect the inductive power harvesting performance of the energy harvesting coil. Therefore, it is necessary to design an energy harvesting coil structure to optimize these problems from the perspectives of magnetic focusing performance and anti-magnetic leakage. Summary of the Invention

[0003] This invention provides an energy harvesting coil structure suitable for low-load circuits. By changing the annular iron core structure, the magnetic circuit, thickness, and width of the iron core are reasonably increased, which improves the magnetic concentration ability and effectively avoids the problem of magnetic leakage at the air gap of the magnetic circuit. This allows the magnetic leakage at the air gap of the magnetic circuit to be completely absorbed by the iron core itself, greatly improving the output power of the energy harvesting coil.

[0004] This utility model is achieved using the following technical solution: a power extraction coil structure suitable for low-load circuits, wherein the annular iron core comprises three layers: upper, middle, and lower. The bottom surface of the upper iron core layer and the top surface of the lower iron core layer both have raised arc strips, while the top and bottom surfaces of the middle iron core layer both have recessed arc grooves. When the upper, middle, and lower iron core layers are joined, the arc strips and arc grooves are aligned to define the position of each iron core layer, ensuring alignment of the inner and outer edges of the iron core layers and avoiding magnetic loss. The use of three layers (upper, middle, and lower) increases the magnetic circuit, thickness, and width of the iron core to a certain extent, thereby improving the magnetic focusing effect.

[0005] The aforementioned energy harvesting coil structure suitable for low-load lines features prism blocks at the outer edges of the opening and closing sections of the upper, middle, and lower core layers. After the energy harvesting coil is closed, the prism blocks are rotated clockwise and counterclockwise to ensure that the opening sections of the upper, middle, and lower core layers are not on the same plane but are staggered. This allows the leakage magnetic flux at the opening and closing sections to be completely absorbed by the adjacent core layers, effectively avoiding the problem of large amounts of leakage magnetic flux in the air gap of the opening and closing sections.

[0006] The above-mentioned energy extraction coil structure suitable for low-load lines connects the winding turns on both sides of the annular iron core structure through coil leads.

[0007] In the above-mentioned energy extraction coil structure suitable for low-load lines, the circular arc strips and circular arc grooves are replaced with angular strips and angular grooves or corner strips and corner grooves.

[0008] The present invention has the following advantages over the prior art: 1. The use of three layers of iron core, namely upper, middle and lower, increases the magnetic circuit, thickness and width of the iron core to a certain extent, thereby improving the magnetic concentration effect and making it more suitable for low-load overhead lines.

[0009] 2. The use of a rotating core layer ensures that the leakage magnetic flux of the opening and closing section is completely absorbed by the adjacent core layer, effectively avoiding the problem of large leakage magnetic flux in the air gap of the opening and closing section and improving the output power of the energy harvesting coil.

[0010] 3. The energy extraction coil is designed to be openable and closable, so the installation process does not require disassembling the circuit and is easy to install. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of an existing energy harvesting coil.

[0012] Figure 2 This is a three-dimensional structural diagram of the disassembled annular iron core of the energy harvesting coil of this utility model.

[0013] Figure 3 This is a three-dimensional structural diagram of the energy harvesting coil after it has been opened and closed according to this utility model.

[0014] Figure 4 This is a three-dimensional structural diagram of the energy harvesting coil after it is closed.

[0015] Figure 5 This is a schematic diagram of the opening and closing cross section of this utility model.

[0016] In the diagram: 1-circular arc strip, 2-circular arc groove, 3-prism block, 4-winding coil, 5-coil lead, 6-lower core layer opening and closing section, 7-middle core layer opening and closing section, 8-upper core layer opening and closing section, 9-upper core layer, 10-middle core layer, 11-lower core layer, 12-opening and closing section. Detailed Implementation

[0017] like Figure 2 The diagram shows a three-dimensional structural representation of the disassembled annular core of the energy harvesting coil. The annular core structure comprises three core layers: upper, middle, and lower. The upper core layer 9 and the lower core layer 11 have raised arcuate strips 1, while the middle core layer 10 has recessed arcuate grooves 2. These layers are aligned during assembly to define the position of each core layer, ensuring alignment of the inner and outer edges and preventing magnetic loss. The use of three core layers (upper, middle, and lower) increases the magnetic circuit, thickness, and width of the core, thereby improving the magnetic focusing effect.

[0018] like Figure 3 , 4 The diagram shows a three-dimensional structure of the energy harvesting coil in both open and closed states. In the open / closed state, the coil leads 5 connect the winding turns 4 on both sides of the core structure. Prism blocks 3 are provided at the outer edges of the open / closed sections of the upper, middle, and lower core layers. When the energy harvesting coil is closed, as shown... Figure 4 As shown, by rotating the prism block 3 clockwise and counterclockwise, it is ensured that the opening and closing sections of the upper, middle, and lower iron core layers are not on the same plane, but are staggered. This function ensures that the leakage magnetic field at the opening section is completely absorbed by the adjacent iron core layer, effectively avoiding the problem of large leakage magnetic field in the air gap of the opening and closing section.

[0019] In practice, the arc strip 1 and the arc groove 2 can also be an edge strip and an edge groove, or a corner strip and a corner groove, such as... Figure 5 The diagram shows a schematic of the open / closed cross-section. Furthermore, more core layers do not necessarily mean stronger magnetic focusing ability; too many core layers may lead to uneven magnetic field distribution, thus reducing the magnetic focusing effect. This invention reasonably considers the core layer thickness T and width W. With three core layers, a core layer thickness T of 3~4.5cm and a width W of 4.5~6.5cm are selected, which exhibit good low-load inductive power extraction performance within the design area. In addition, silicon steel and pure iron are selected as the core material to improve the magnetic focusing performance from the material perspective.

Claims

1. A power extraction coil structure suitable for low-load circuits, characterized in that: Its annular core includes three core layers: upper, middle and lower. The bottom surface of the upper core layer (9) and the top surface of the lower core layer (11) have raised arc strips (1), and the top and bottom surfaces of the middle core layer (10) have recessed arc grooves (2). When the upper core layer (9), the middle core layer (10) and the lower core layer (11) are spliced ​​together, the arc strips (1) and the arc grooves (2) are aligned with each other to define the position of each core layer.

2. The energy harvesting coil structure suitable for low-load lines according to claim 1, characterized in that: Prismatic blocks (3) are provided at the outer edges of the opening and closing sections of the upper, middle and lower iron core layers.

3. The energy harvesting coil structure suitable for low-load circuits according to claim 1 or 2, characterized in that: The winding coils (4) on both sides of the annular core structure are connected by the coil lead (5).

4. The energy harvesting coil structure suitable for low-load circuits according to claim 1 or 2, characterized in that: The arc strip (1) and arc groove (2) are replaced with edge strip and edge groove or corner strip and corner groove.

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