Current sensor of railway power transmission line fault monitoring device
By adopting a high-permeability magnetic core layer structure and an intersecting inner and outer coil design in the fault monitoring device of the railway power through line, the problem of difficult to perceive a weak ground fault current in the prior art is solved, and higher measurement accuracy and fault monitoring accuracy are achieved.
Patent Information
- Application Number
- CN202421472060.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-06-26
AI Technical Summary
When the existing fault monitoring device measures the weak grounding fault current of the railway power through line, it is difficult to reliably perceive, which affects the accuracy of fault monitoring.
A current sensor for a railway power through-line fault monitoring device is designed, adopting a high magnetic permeability magnetic core layer structure, and a coil is wound intersected between the inner ring and the outer ring coil, which expands the coupling ability to weak magnetic signals. The wiring direction of the inner ring and the outer ring coil is opposite, eliminating the influence of the perpendicular magnetic field and improving measurement accuracy.
It improves the perception of weak ground fault current, enhances the accuracy of fault monitoring, and ensures the power supply reliability of railway power through lines.
Smart Images
Figure CN223166850U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fault monitoring of railway power through lines, and specifically to a current sensor of a fault monitoring device for railway power through lines. Background Art
[0002] The 10kV isolated and through power lines of railways undertake the power supply tasks for important loads such as communication and signal along the railway. Their power supply reliability is directly related to the safety production and transportation order of the railway system. Since the railway power through lines are built along the railway alignment, they have the characteristics of long power supply arms, many power supply points, scattered loads, and small load currents. Their operating environment is complex, erected outdoors and without backup, and is easily affected by faults such as loosening, falling off, and burning out of the equipment itself, as well as external environmental factors such as bird damage and foreign objects, which can easily cause arcing and single-phase grounding faults, endangering the normal power supply of signal equipment along the high-speed railway.
[0003] The neutral point of the 10kV isolated and through power lines belongs to a small current grounding system. When a single-phase grounding fault occurs in the line, the grounding fault current is very small. Especially for the normal load current of the isolated and through lines itself is relatively small, making the amplitude of the grounding fault current even smaller. The current sensors of the existing fault monitoring devices mostly use Rogowski coils, which are coils with a hollow annular structure. They have the ability to instantaneously respond when measuring fault currents within a relatively wide frequency range, and because of their good linearity and not being easily saturated, they are widely used in fault monitoring devices. However, the measurement advantage of Rogowski coils is mainly reflected in the measurement of high-frequency and large fault currents. On the contrary, for the weak grounding fault current generated when a grounding fault occurs in the railway power through line, using a Rogowski coil for measurement will inevitably result in the situation that the grounding fault current cannot be reliably sensed, affecting the fault monitoring of the railway power through line. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a current sensor of a fault monitoring device for railway power through lines to solve the problems raised in the above background art.
[0005] To achieve the above purpose, the utility model provides the following technical solutions:
[0006] A current sensor of a fault monitoring device for railway power through lines, comprising: a magnetic core layer structure, an inner insulating plate, and an outer insulating plate. A first hollow layer is formed between the inner insulating plate and the magnetic core layer structure, and a second hollow layer is formed between the outer insulating plate and the magnetic core layer structure;
[0007] An inner coil is wound clockwise between the inner insulating plate and the magnetic core layer structure, and an outer coil is wound counterclockwise between the outer insulating plate and the magnetic core layer structure;
[0008] Alternatively, an inner coil is wound counterclockwise between the inner insulating plate and the magnetic core layer structure, and an outer coil is wound clockwise between the outer insulating plate and the magnetic core layer structure;
[0009] The cross - section of the inner coil and the outer coil wraps the magnetic core layer structure.
[0010] The current sensor of the railway power through - line fault monitoring device as described above: The magnetic core layer structure includes an inner insulating clamping plate and an outer insulating clamping plate. A magnetic core is embedded between the inner insulating clamping plate and the outer insulating clamping plate, and both sides of the magnetic core are closely attached to the inner insulating clamping plate and the outer insulating clamping plate respectively.
[0011] The current sensor of the railway power through - line fault monitoring device as described above: The current sensor of the railway power through - line fault monitoring device further includes a housing. The housing includes two symmetrically arranged semi - circular shells, and a placement space for wrapping the magnetic core layer structure, the inner insulating plate and the outer insulating plate is formed inside the semi - circular shells.
[0012] The current sensor of the railway power through - line fault monitoring device as described above: Resin potting glue is filled between the inner wall of the semi - circular shell and the inner insulating clamping plate and between the inner wall of the semi - circular shell and the outer insulating clamping plate.
[0013] The current sensor of the railway power through - line fault monitoring device as described above: The two semi - circular shells are hinged by a rotary buckle.
[0014] The current sensor of the railway power through - line fault monitoring device as described above: An explosion - proof joint is installed on one of the semi - circular shells, and the inner coil and the outer coil penetrate through the semi - circular shell and are connected to the explosion - proof joint.
[0015] The current sensor of the railway power through - line fault monitoring device as described above: A lead - out wire for wrapping the inner coil and the outer coil is connected to the explosion - proof joint.
[0016] The current sensor of the railway power through - line fault monitoring device as described above: A cover plate is detachably installed on the top of the semi - circular shell.
[0017] Compared with the prior art, the beneficial effects of the present utility model are:
[0018] Utilizing the characteristic that a magnetic core with high magnetic permeability can effectively absorb the external environmental magnetic field, based on the design principle of Rogowski coil, a magnetic core with a certain thickness is embedded between the magnetic core layer structures. When winding the coil turns, taking this magnetic core as the intersection part, the inner coil and the outer coil are respectively wound, which expands the coupling ability of the current sensor to weak magnetic signals and has more superiority when sensing weak current signals in the wire.
[0019] The inner coil and the outer coil of the sensor adopt forward and reverse wire-walking directions, which can eliminate the influence of the magnetic field perpendicular to the coil plane to a certain extent and improve the measurement accuracy of the sensor.
[0020] The current sensor is designed to be openable and closable, enabling fast and simple installation. Brief Description of the Drawings
[0021] Figure 1 It is a schematic structural diagram of the current sensor of the railway power through line fault monitoring device.
[0022] Figure 2 It is a schematic structural diagram of the hollow layer and the magnetic core layer structure in the current sensor of the railway power through line fault monitoring device.
[0023] Figure 3 It is a schematic structural diagram of the magnetic core layer structure in the current sensor of the railway power through line fault monitoring device.
[0024] Figure 4 It is a schematic structural diagram of the inner coil and the outer coil in the current sensor of the railway power through line fault monitoring device.
[0025] In the figure: 1. Rotary buckle; 2. Lead wire; 3. Cover plate; 4. Housing; 5. Explosion-proof joint; 6. Resin potting adhesive; 7. Fixed bolt; 8. Inner insulating plate; 9. Inner insulating clamping plate; 10. Outer insulating clamping plate; 11. Outer insulating plate; 12. Hollow layer; 13. Magnetic core; 14. PCB board; 15. Inner coil; 16. Outer coil. Detailed Description of the Specific Embodiment
[0026] Hereinafter, various exemplary embodiments, features, and aspects of the present application will be described in detail with reference to the drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, unless otherwise specified, the drawings do not have to be drawn to scale.
[0027] The special term "exemplary" here means "serving as an example, embodiment, or illustrative". Any embodiment described here as "exemplary" does not have to be construed as superior to or better than other embodiments.
[0028] In addition, for a better illustration of the present application, numerous specific details are provided in the following specific embodiments. Those skilled in the art should understand that the present application can be implemented without certain specific details. In some instances, methods, means, and components well-known to those skilled in the art are not described in detail so as to highlight the gist of the present application.
[0029] Please refer to Figures 1 to 4 , in the embodiment of the present utility model, a current sensor of a railway power through line fault monitoring device includes: a magnetic core layer structure, an inner insulating plate 8 and an outer insulating plate 11, an inner coil 15, and an outer coil 16.
[0030] Specifically as follows, please refer to Figure 2 , Figure 3 , Figure 4 , including:
[0031] The magnetic core layer structure, the inner insulating plate 8 and the outer insulating plate 11, a first hollow layer is formed between the inner insulating plate 8 and the magnetic core layer structure, and a second hollow layer is formed between the outer insulating plate 11 and the magnetic core layer structure;
[0032] The inner coil 15 is wound around the magnetic core layer structure in a clockwise direction between the inner insulating plate 8 and the magnetic core layer structure, and the outer coil 16 is wound around the magnetic core layer structure in a counterclockwise direction between the outer insulating plate 11 and the magnetic core layer structure;
[0033] The intersection part of the inner coil 15 and the outer coil 16 wraps the magnetic core layer structure
[0034] Specifically, in another embodiment, the inner coil 15 is wound around the magnetic core layer structure in a counterclockwise direction between the inner insulating plate 8 and the magnetic core layer structure, and the outer coil 16 is wound around the magnetic core layer structure in a clockwise direction between the outer insulating plate 11 and the magnetic core layer structure.
[0035] In detail, in this embodiment, the current sensor of the railway power through line fault monitoring device described in the present utility model is used. When in use, by using the magnetic core layer structure as the intersection part, the inner coil 15 and the outer coil 16 are respectively wound, which expands the coupling ability of the current sensor to weak magnetic signals. When sensing weak current signals in the wire, it has more superiority. Moreover, the inner coil 15 and the outer coil 16 always maintain opposite wire-walking directions, which can eliminate the influence of the magnetic field perpendicular to the coil plane to a certain extent, improve the measurement accuracy of the sensor, and can reliably sense the situation of the grounding fault current to improve the accuracy of the railway power through line fault monitoring.
[0036] Among them, this utility model utilizes the characteristic that the magnetic core with high magnetic permeability can effectively absorb the external environmental magnetic field. Based on the design principle of the Rogowski coil, a magnetic core layer structure is arranged between the inner insulating plate 8 and the outer insulating plate 11. Specifically, the Rogowski coil belongs to the prior art, and this utility model will not give redundant elaboration.
[0037] Of course, in this utility model, the hollow layer 12 includes a first hollow layer and a second hollow layer. For details, please refer to Figure 2 .
[0038] Please refer to Figure 2 and Figure 3 . The magnetic core layer structure includes an inner insulating clamping plate 9 and an outer insulating clamping plate 10. A magnetic core 13 is embedded between the inner insulating clamping plate 9 and the outer insulating clamping plate 10, and both sides of the magnetic core 13 are closely attached to the inner insulating clamping plate 9 and the outer insulating clamping plate 10 respectively.
[0039] Specifically, the inner coil 15 winds and routes with the inner insulating clamping plate 9 and the outer insulating plate 11 as turns, and the outer coil 16 winds and routes with the outer insulating clamping plate 10 and the inner insulating plate 8 as turns. Among them, the directions of the inner coil 15 and the outer coil 16 must always be opposite. While expanding the coupling ability of the current sensor to weak magnetic signals, it can, to a certain extent, eliminate the influence of the magnetic field perpendicular to the coil plane and improve the measurement accuracy of the sensor.
[0040] The current sensor of the railway power supply line fault monitoring device further includes a housing 4. The housing 4 includes two symmetrically arranged semi-cylindrical shells, and a placement space for wrapping the magnetic core layer structure, the inner insulating plate 8, and the outer insulating plate 11 is formed inside the semi-cylindrical shell.
[0041] Exemplarily, to ensure that when the sensor works, the influence of the external environment on the current is reduced, the housing 4 must use a material with insulating properties, and an ABS plastic material with high insulating properties can be used.
[0042] Preferably, resin potting glue 6 is filled between the inner wall of the semi-cylindrical shell and the inner insulating plate 8 and between the inner wall of the semi-cylindrical shell and the outer insulating clamping plate 10, mainly to achieve the functions of waterproofing, dustproofing, and anti-corrosion of the inner insulating plate 8, the outer insulating plate 11, and the magnetic core layer structure, and improve the service life of the internal electronic components of the sensor.
[0043] It should be noted that: The current sensor is designed as an openable and closable structure, with both sides being symmetrical structures. Among them, the inner insulating plate 8, the outer insulating plate 11 and the magnetic core layer structure form a semi-circular skeleton, and the cross-section of the skeleton is encapsulated and fixed by the PCB board 14. Among them, the inner coil 15 and the outer coil 16 on one semi-circular skeleton are connected to the inner coil 15 and the outer coil 16 on the other semi-circular skeleton, and the semi-circular skeleton is placed in the placement space of the semi-circular housing.
[0044] Preferably, the two semi-circular housings are hinged by a rotary buckle 1 to facilitate the opening and closing of the two semi-circular housings, so as to achieve rapid and simple installation.
[0045] Please refer to Figure 1 , an explosion-proof joint 5 is installed on one of the semi-circular housings, and the inner coil 15 and the outer coil 16 penetrate through the semi-circular housing and are connected to the explosion-proof joint 5 to realize the connection and use of the sensor with external electronic components.
[0046] Preferably, a lead wire 2 that wraps the inner coil 15 and the outer coil 16 is connected to the explosion-proof joint 5. Among them, the lead wire 2 is made of a material with good insulation performance and can stably transmit the situation of the ground fault current.
[0047] Preferably, a cover plate 3 is detachably installed on the top of the semi-circular housing. Among them, the cover plate 3 is made of insulating plastic
[0048] Exemplarily, threaded holes are respectively formed on the semi-circular housing and the cover plate 3, and the detachable connection between the semi-circular housing and the cover plate 3 is realized through the fixing bolt 7, and the stability of the connection is ensured when the semi-circular housing and the cover plate 3 are connected.
[0049] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.
[0050] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A current sensor for a fault monitoring device of a railway power supply through line, characterized in that, Comprising: A magnetic core layer structure, an inner insulating plate (8) and an outer insulating plate (11). A first hollow layer is formed between the inner insulating plate (8) and the magnetic core layer structure, and a second hollow layer is formed between the outer insulating plate (11) and the magnetic core layer structure; An inner coil (15) is wound around between the inner insulating plate (8) and the magnetic core layer structure in the clockwise direction, and an outer coil (16) is wound around between the outer insulating plate (11) and the magnetic core layer structure in the counterclockwise direction; Or, an inner coil (15) is wound around between the inner insulating plate (8) and the magnetic core layer structure in the counterclockwise direction, and an outer coil (16) is wound around between the outer insulating plate (11) and the magnetic core layer structure in the clockwise direction; The cross-over part of the inner coil (15) and the outer coil (16) wraps the magnetic core layer structure.
2. The current sensor of a railway power through line fault monitoring device according to claim 1, characterized in that The magnetic core layer structure includes an inner insulating clamping plate (9) and an outer insulating clamping plate (10). A magnetic core (13) is embedded between the inner insulating clamping plate (9) and the outer insulating clamping plate (10), and both sides of the magnetic core (13) are closely attached to the inner insulating clamping plate (9) and the outer insulating clamping plate (10) respectively.
3. The current sensor of a railway power feed line fault monitoring device according to claim 1, characterized in that The current sensor of the railway power supply line fault monitoring device further includes a housing (4), and the housing (4) includes two symmetrically arranged semi-cylindrical shells. A placement space for wrapping the magnetic core layer structure, the inner insulating plate (8) and the outer insulating plate (11) is formed inside the semi-cylindrical shell.
4. The current sensor of a railway power through line fault monitoring device according to claim 3, characterized in that, Resin potting glue (6) is filled between the inner wall of the semi-cylindrical shell and the inner insulating clamping plate (9) and between the inner wall of the semi-cylindrical shell and the outer insulating clamping plate (10).
5. The current sensor of a railway power through line fault monitoring device according to claim 3, characterized in that, The two semi-cylindrical shells are hinged by a rotary buckle (1).
6. The current sensor of a railway power supply line fault monitoring device according to claim 3, characterized in that, An explosion-proof joint (5) is installed on one of the semi-cylindrical shells, and the inner coil (15) and the outer coil (16) penetrate through the semi-cylindrical shell and are connected to the explosion-proof joint (5).
7. The current sensor of a railway power through line fault monitoring device according to claim 6, characterized in that, An outgoing wire (2) for wrapping the inner coil (15) and the outer coil (16) is connected to the explosion-proof joint (5).
8. The current sensor of a railway power supply overhead line fault monitoring device according to claim 3, characterized in that A cover plate (3) is detachably installed on the top of the semi-cylindrical shell.