Energy-taking mutual inductor and fault monitoring device

Abstract

The utility model is suitable for the technical field of electronic equipment, and provides an energy-taking mutual inductor and a fault monitoring device.The energy-taking mutual inductor comprises an energy-taking iron core and wire turns, the energy-taking iron core is annular so that a cable can penetrate through the energy-taking iron core, the cable is provided with at least two core wires, and the wire turns are wound on the energy-taking iron core in at least two sections distributed at intervals; the at least two wire turns are in one-to-one correspondence with the at least two core wires, so that the distance between the position, wound on the energy-taking iron core, of each wire turn and the corresponding core wire is minimum. According to the magnetic field distribution rule around the cable, the multi-section layout mode is adopted for the wire turns, so that it is guaranteed that each wire turn is distributed at the position with the maximum magnetic induction intensity, the output voltage of the energy taking coil is improved, and power output required by the load of online monitoring equipment is better achieved.

Description

Technical Field

[0001] This application belongs to the field of electronic equipment technology, and in particular relates to an energy harvesting transformer and a fault monitoring device. Background Technology

[0002] The high-voltage cables used in wind farms are equipped with a variety of online monitoring devices, such as those for monitoring circulation current, temperature, vibration, load, and fault conditions. In the absence of mains power, power supply from energy transformers is an essential component of these online monitoring devices.

[0003] High-voltage cables typically have multiple cores; for example, a three-core current collector cable contains three cores. Since each phase core of the cable generates a magnetic field, magnetic field superposition and cancellation occur around the cable, resulting in an uneven magnetic field distribution. If a traditional single-coil current transformer is used to couple the magnetic field around the three-core current collector cable, such as... Figure 1 As shown, due to the generally low magnitude of the surrounding magnetic induction intensity, the output voltage of the current transformer is greatly reduced, which cannot meet the power output requirements of the online monitoring equipment load. Utility Model Content

[0004] This application provides an energy harvesting transformer, which aims to solve the problem that existing energy harvesting transformers cannot meet the power output requirements of online monitoring equipment loads.

[0005] The embodiments of this application are implemented as follows: a power harvesting transformer is provided, including a power harvesting core and coils. The power harvesting core is ring-shaped for a cable to pass through. The cable has at least two core wires. At least two sections of the coils are wound around the power harvesting core at intervals. The at least two sections of the coils correspond one-to-one with the at least two core wires, so that the distance between the position of each section of the coils wound on the power harvesting core and the corresponding core wire is minimized.

[0006] Furthermore, the cable has three core wires, with the wires wound in three spaced sections around the energy-harvesting iron core.

[0007] Furthermore, it also includes an insulating shell, which is composed of at least two arc-shaped shells with built-in spaces. The energy harvesting core is divided into at least two segments, and the at least two segments of the energy harvesting core are arranged one-to-one within the built-in spaces of the at least two arc-shaped shells.

[0008] Furthermore, potting compound is used to fill the space between the energy extraction core and the inner surface of the built-in space.

[0009] Furthermore, a positioning block is provided at the first port of the arc-shaped shell, and a positioning groove that mates with the positioning block is provided at the second port of the arc-shaped shell.

[0010] Furthermore, the positioning block is provided with a guide hole, and the positioning groove is provided with a pin that mates with the guide hole. Both the guide hole and the pin are electrically connected to the wire turn.

[0011] Furthermore, both the first and second ports are equipped with sealing gaskets.

[0012] Furthermore, the two adjacent arc-shaped shells are hinged on one side by a rotating shaft, and the other side is clamped together by a fixing clip.

[0013] Furthermore, it also includes a voltage output line and an explosion-proof connector. The voltage output line is fixed to the housing through the explosion-proof connector, and the voltage output line is electrically connected to the coil.

[0014] Secondly, this application also provides a fault monitoring device, including the energy harvesting transformer as described above.

[0015] The beneficial effects of this application are as follows: The energy harvesting transformer provided by this application includes an energy harvesting core and coils. The energy harvesting core is ring-shaped to allow a cable to pass through. The cable has at least two core wires. At least two segments of the coils are wound around the energy harvesting core at intervals, with each of the at least two coil segments corresponding to one of the at least two core wires, so that the distance between the position of each coil segment wound on the energy harvesting core and the corresponding core wire is minimized. By taking into account the magnetic field distribution pattern around the cable, a multi-segment layout is adopted for the coils to ensure that each coil is distributed at the position of maximum magnetic induction intensity, thereby improving the output voltage of the energy harvesting coil and better achieving the power output required by the load of online monitoring equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an energy harvesting transformer provided by existing technology;

[0017] Figure 2 This is a schematic diagram of the structure of the energy harvesting core and coils of an embodiment of the energy harvesting transformer provided in this application;

[0018] Figure 3 This is a schematic diagram of the structure of an embodiment of the energy harvesting transformer provided in this application, in which the energy harvesting core and the coil are split into two halves;

[0019] Figure 4 This is a partial perspective structural diagram of an embodiment of the energy harvesting transformer provided in this application;

[0020] Figure 5 This is a schematic diagram of the structure of an embodiment of the energy harvesting transformer provided in this application, split in two halves.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100-Energy extraction core, 120-Wire coil, 130-Cable, 140-Insulating shell, 150-Potting compound, 160-Positioning block, 170-Positioning groove, 180-Guide hole, 190-Pin, 200-Sealing gasket, 210-Rotating shaft, 220-Fixing clip, 230-Threaded hole, 240-Bolt, 250-Voltage output line, 260-Explosion-proof connector. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0024] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference values ​​and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0029] The energy harvesting transformer provided in this application includes an energy harvesting core and coils. The energy harvesting core is ring-shaped to allow a cable to pass through. The cable has at least two core wires. At least two segments of the coils are wound around the energy harvesting core at intervals, with each of the at least two coil segments corresponding to one of the at least two core wires, so that the distance between the position of each coil segment on the energy harvesting core and its corresponding core wire is minimized. By taking into account the magnetic field distribution pattern around the cable, a multi-segment layout is adopted for the coils to ensure that each coil is distributed at the position of maximum magnetic induction intensity, thereby increasing the output voltage of the energy harvesting coil and better achieving the power output required by the load of online monitoring equipment.

[0030] like Figures 2 to 5 As shown, an embodiment of this application provides an energy harvesting transformer, including an energy harvesting core 100 and wire turns 120. The energy harvesting core 100 is ring-shaped for a cable 130 to pass through. The cable 130 has at least two core wires. At least two segments of the wire turns 120 are wound around the energy harvesting core 100 at intervals. The at least two segments of the wire turns 120 correspond one-to-one with the at least two core wires, so that the distance between the position of each segment of the wire turns 120 wound on the energy harvesting core 100 and the corresponding core wire is minimized.

[0031] In implementation, this application uses a three-core current collector cable 130 as an example, that is, the cable 130 has three core wires. It should be noted that the three-core current collector cable 130 is an example of an embodiment of this application, and not a specific limitation of this application. In some other embodiments, the cable 130 may also be a current collector cable 130 with other cores, such as a two-core current collector cable 130 or a four-core current collector cable 130, etc., without limitation.

[0032] The energy-harvesting core 100 is in the shape of a ring, so that the cable 130 can pass through the middle of the energy-harvesting core 100. At the same time, the wire coil 120 is wound around the energy-harvesting core 100, so that the wire coil 120 can couple the magnetic field around the cable 130 and output voltage.

[0033] When the coil 120 is wound around the energy-extracting iron core 100, it is distributed in segments. The number of segments of the coil 120 is the same as the number of core wires in the cable 130, that is, each segment of the coil 120 corresponds to one core wire. For example, taking a cable 130 with three core wires as an example... Figure 4 As shown, the coil 120 is divided into three sections and wound on the energy harvesting core 100. The three sections of coil 120 correspond one-to-one with the three core wires, and the distance between the position of each section of coil 120 and the corresponding core wire is minimized, so as to ensure that each section of coil 120 is distributed at the position of maximum magnetic induction intensity, thereby increasing the output voltage of the energy harvesting coil.

[0034] During implementation, the distribution of each phase core wire in the three-core collector cable can be observed at the cross-section of the cable 130. A mark can then be made on the outer surface of the cable 130's protective layer indicating the closest position to a core wire in the three-core collector cable. When the energy harvesting core 100 is mounted on the cable, the position of the coil 120 on the energy harvesting core 100 is aligned with the position of this mark, ensuring that each coil 120 segment is distributed at the location of maximum magnetic induction intensity.

[0035] When the current transformer needs to be installed in the middle of cable 130, the distribution of the core wires cannot be directly observed due to the protective layer. At this time, a current clamp meter can be used to test the current change on the coil or the current change of the lead wire that is electrically connected to the coil. By slightly rotating the current transformer, when the current clamp meter shows the maximum current value, it is aligned with the nearest position of the core wire, thus ensuring that each coil segment 120 is distributed at the position of maximum magnetic induction intensity.

[0036] The energy harvesting transformer provided in this application includes an energy harvesting core 100 and coils 120. The energy harvesting core 100 is ring-shaped to allow a cable 130 to pass through. The cable 130 has at least two core wires. At least two segments of the coils 120 are wound around the energy harvesting core 100 at intervals, with each segment of the coil 120 corresponding to one of the at least two core wires, so that the distance between the position of each coil segment on the energy harvesting core 100 and the corresponding core wire is minimized. By considering the magnetic field distribution around the cable 130, a multi-segment layout is adopted for the coils 120 to ensure that each coil 120 is distributed at the position of maximum magnetic induction intensity, thereby increasing the output voltage of the energy harvesting coil and better achieving the power output required by the load of online monitoring equipment.

[0037] Optionally, it also includes an insulating shell 140, which is composed of at least two arc-shaped shells. The arc-shaped shells are provided with internal spaces. The energy harvesting core 100 is divided into at least two segments, and the at least two segments of the energy harvesting core 100 are respectively arranged in the internal spaces of the at least two arc-shaped shells.

[0038] The energy-harvesting core 100 is housed within the internal space of the arc-shaped shell, meaning the arc-shaped shell encloses a section of the energy-harvesting core 100 to protect and insulate both the energy-harvesting core 100 and the wire turns 120. At least two arc-shaped shells can be sequentially assembled to form an annular insulating outer shell 140, thereby enabling the energy-harvesting core 100 to form a complete annular structure, facilitating its assembly and connection to the cable 130.

[0039] Optionally, potting compound 150 is filled between the energy harvesting core 100 and the inner surface of the built-in space. By filling the gap between the energy harvesting core 100 and the built-in space with potting compound 150, the energy harvesting core 100 can be effectively stabilized.

[0040] Optionally, a positioning block 160 is provided at the first port of the arc-shaped shell, and a positioning groove 170 that mates with the positioning block 160 is provided at the second port of the arc-shaped shell. The arc-shaped shell has two ports on both sides, and adjacent arc-shaped shells are connected by fitting together at the two ports. For example, taking the insulating shell 140 as an example that includes two arc-shaped shells, the first port of the first arc-shaped shell mates with the second port of the second arc-shaped shell, and the first port of the second arc-shaped shell mates with the second port of the first arc-shaped shell, thereby connecting the two arc-shaped shells into a whole and connecting the two energy-harvesting iron cores 100 into a ring-shaped iron core. Similarly, taking the insulating shell 140 as an example that includes three arc-shaped shells, the first port of the first arc-shaped shell mates with the second port of the second arc-shaped shell, the first port of the second arc-shaped shell mates with the second port of the third arc-shaped shell, and the first port of the third arc-shaped shell mates with the second port of the first arc-shaped shell, thereby connecting the three arc-shaped shells into a whole and connecting the three energy-harvesting iron cores 100 into a ring-shaped iron core.

[0041] When two adjacent arc-shaped shells are connected, the positioning block 160 at the first port and the positioning groove 170 at the second port cooperate to achieve precise positioning of the two adjacent arc-shaped shells. This ensures that when the two adjacent arc-shaped shells are closed and connected, the cross-sectional positions of the two adjacent energy harvesting cores 100 are limited, so that the cross-sections of the two energy harvesting cores 100 can be completely aligned and overlapped, reducing leakage magnetic loss and increasing the output power of the energy harvesting cores 100. At the same time, it can greatly reduce the probability of the energy harvesting cores 100 overheating, abnormal vibration, and corrosion, ensuring that the energy harvesting cores 100 can work continuously for a long time.

[0042] Optionally, the positioning block 160 is provided with a guide hole 180, and the positioning groove 170 is provided with a pin 190 that mates with the guide hole 180. Both the guide hole 180 and the pin 190 are electrically connected to the wire coil 120. When two adjacent arc-shaped shells are closed and connected, the guide hole 180 and the pin 190 are interlocked to form a closed passage.

[0043] Optionally, both the first and second ports are provided with sealing gaskets 200. When two adjacent arc-shaped shells are closed and connected, the sealing gaskets 200 isolate external moisture between the two adjacent arc-shaped shells, effectively preventing oxidation and moisture absorption of the cross section of the energy harvesting core 100.

[0044] Optionally, the two adjacent arc-shaped shells are hinged on one side by a rotating shaft 210, and the other side is clamped by a fixing clip 220. The rotating shaft 210 is provided with a threaded hole 230, and the opening degree of the energy harvesting transformer can be adjusted by tightening or loosening the bolt 240, which facilitates quick installation or disassembly.

[0045] Optionally, it also includes a voltage output line 250 and an explosion-proof connector. The voltage output line 250 is fixed to the housing via the explosion-proof connector and is electrically connected to the coil 120. The voltage output line 250 is provided on the insulating housing 140. The voltage output line 250 passes through the explosion-proof connector and is connected to the coil 120 for outputting induced voltage to power the equipment.

[0046] Secondly, this application also provides a fault monitoring device, including the energy harvesting transformer as described above.

[0047] The energy harvesting transformer provided in this application includes an energy harvesting core 100 and coils 120. The energy harvesting core 100 is ring-shaped to allow a cable 130 to pass through. The cable 130 has at least two core wires. At least two segments of the coils 120 are wound around the energy harvesting core 100 at intervals, with each segment of the coil 120 corresponding to one of the at least two core wires, so that the distance between the position of each coil segment on the energy harvesting core 100 and the corresponding core wire is minimized. By considering the magnetic field distribution around the cable 130, a multi-segment layout is adopted for the coils 120 to ensure that each coil 120 is distributed at the position of maximum magnetic induction intensity, thereby increasing the output voltage of the energy harvesting coil and better achieving the power output required by the load of online monitoring equipment.

[0048] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power harvesting transformer, characterized in that, It includes an energy-harvesting core and coils. The energy-harvesting core is ring-shaped for a cable to pass through. The cable has at least two core wires. The coils are wound in at least two segments spaced apart on the energy-harvesting core. The at least two segments of the coils correspond one-to-one with the at least two core wires, so that the distance between the position of each segment of the coils wound on the energy-harvesting core and the corresponding core wire is minimized.

2. The energy harvesting transformer as described in claim 1, characterized in that, The cable has three core wires, and the wire turns are divided into three spaced sections and wound around the energy-harvesting iron core.

3. The energy harvesting transformer as described in claim 1 or 2, characterized in that, It also includes an insulating shell, which is composed of at least two arc-shaped shells, each arc-shaped shell having an internal space. The energy harvesting core is divided into at least two segments, and the at least two segments of the energy harvesting core are arranged one-to-one within the internal spaces of the at least two arc-shaped shells.

4. The energy harvesting transformer as described in claim 3, characterized in that, The space between the energy harvesting core and the inner surface of the built-in space is filled with potting compound.

5. The energy harvesting transformer as described in claim 3, characterized in that, The first port of the arc-shaped shell is provided with a positioning block, and the second port of the arc-shaped shell is provided with a positioning groove that cooperates with the positioning block.

6. The energy harvesting transformer as described in claim 5, characterized in that, The positioning block is provided with a guide hole, and the positioning groove is provided with a pin that mates with the guide hole. Both the guide hole and the pin are electrically connected to the wire coil.

7. The energy harvesting transformer as described in claim 5 or 6, characterized in that, Both the first port and the second port are equipped with sealing gaskets.

8. The energy harvesting transformer as described in claim 3, characterized in that, The two adjacent arc-shaped shells are hinged on one side by a rotating shaft, and the other side is fastened by a fixing clip.

9. The energy harvesting transformer as described in claim 3, characterized in that, It also includes a voltage output line and an explosion-proof connector. The voltage output line is fixed to the housing through the explosion-proof connector, and the voltage output line is electrically connected to the coil.

10. A fault monitoring device, characterized in that, Includes the energy harvesting transformer as described in any one of claims 1 to 9.

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