Sensor locking device and method for three-phase cable

Abstract

The invention relates to the technical field of electric power engineering, in particular to a three-phase cable sensor locking device and method.The three-phase cable sensor locking device comprises at least three locking bodies which are connected end to end and form an annular shape, the outer side of the circumference of one locking body is connected with a junction box through a connecting piece, and every two adjacent locking bodies are movably connected through an expansion plug; the locking body comprises two groups of tightening bodies which are arranged in parallel, a glue pouring groove is formed between the two tightening bodies, a glue pouring groove cover is arranged on the upper top surface of the glue pouring groove, a wire passing block is arranged on the upper top surface of the glue pouring groove cover, a space formed by the glue pouring groove and the glue pouring groove cover is used for accommodating a circuit board with a magnetic induction chip, and a circuit led out from the circuit board penetrates through the wire passing block and is connected into the junction box. The three-phase cable sensor locking device can lock sensors of three-phase cables at the same time, and can adapt to mutual inductor structures of various three-phase cable diameters.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a sensor locking device and method for a three-phase cable. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Cables will detect current by installing various sensors, such as the common current transformer. Since the current transformer has a fixed diameter and can usually only detect the current of one phase by induction, it cannot be directly used in three-phase cables.

[0004] The current or magnetic field changes in three-phase cables can be monitored based on the principle of electromagnetic induction, and the current information can be indirectly obtained by measuring the magnetic field changes of the cable. Although the sensor made using this principle can be used in three-phase cables, it will be affected by the difference in cable diameter, making it difficult to fix it on the cable. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a sensor locking device and method for a three-phase cable, so that a magnetic induction chip current sensor can be reliably locked to a three-phase cable and can adapt to the diameters of various three-phase cables.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A first aspect of the present invention provides a sensor locking device for a three-phase cable, comprising at least three locking bodies connected end to end to form a ring, wherein the outer circumference of one locking body is connected to a junction box via a connecting piece, and two adjacent sets of locking bodies are movably connected;

[0008] The locking body comprises at least two groups of tightening bodies arranged in parallel, a glue pouring groove is provided between the two tightening bodies, a glue pouring groove cover is provided on the upper top surface of the glue pouring groove, a wire passing block is provided on the upper top surface of the glue pouring groove cover, the space formed by the glue pouring groove and the glue pouring groove cover is used to accommodate the circuit board, the wires led out of the circuit board pass through the wire passing block and are connected to the junction box, a magnetic conductive sheet is provided on the inner side of the arc after the tightening body is connected to the glue pouring groove, and a software is provided on the inner surface of the magnetic conductive sheet.

[0009] Furthermore, both tightening bodies are arc-shaped.

[0010] Furthermore, the soft body includes a magnetic core and a protective layer wrapped around the outer surface of the magnetic core.

[0011] Furthermore, the contact surface between the tightening body and the glue pouring slot cover is an inclined surface.

[0012] Furthermore, the wire passing block is located in a groove on the top surface of the glue filling tank cover.

[0013] Furthermore, the fastener passes through the tightening body and is connected to one side of the wire passing block.

[0014] Furthermore, by tightening the fastener, the tightening body moves toward the direction close to the glue filling groove, and pushes the glue filling groove together with the magnetic conductive sheet and the software toward the direction close to the cable, thereby achieving locking between the locking body and the cable under test.

[0015] Furthermore, two adjacent groups of locking bodies are movably connected via an expansion plug.

[0016] Furthermore, a magnetic induction chip is provided on the circuit board.

[0017] A second aspect of the present invention provides a sensor locking method for a three-phase cable, comprising the following steps:

[0018] The circuit board with the magnetic induction chip is installed in the cavity of the glue potting tank cover and the glue potting tank. After the glue potting treatment, the circuit board, the glue potting tank cover and the glue potting tank form a whole. The wire passing block is installed on the top surface of the glue potting tank cover, and the lead wire of the circuit board passes through the wire passing block. The formed whole is clamped by two tightening bodies and then inserted into the fastener for fixing.

[0019] The three sets of locking bodies are connected by expansion plugs to form a ring-shaped locking structure and installed on the cable. The position of the conductor in the three-phase cable is determined by the current signal obtained by the circuit board with a magnetic induction chip.

[0020] When the current signal obtained by a certain circuit board is the largest, it means that the magnetic induction chip is closest to the core wire of the cable, and the corresponding locking body is locked on the cable through the fastener;

[0021] Continue to lock the remaining locking body onto the cable through the fasteners, connect the junction box and the connecting piece together, and connect the connecting piece to the locking device.

[0022] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0023] 1. Three locking bodies connected end to end to form a ring are arranged on the outer side of the circumference of the cable. A circuit board with a magnetic induction chip is arranged in each locking body. The circuit board with the magnetic induction chip is used to detect the current signal of the cable conductor. When the current signal obtained by a certain circuit board is the largest, it means that the magnetic induction chip is closest to the core wire of the cable. Then the corresponding locking body is locked on the cable through a fastener, which can realize the sensor locking of the three-phase cable at the same time and can adapt to the transformer structure of various three-phase cable diameters.

[0024] 2. The contact surface between the tightening body and the glue filling tank cover is an inclined surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 is a schematic diagram of the structure of a locking device provided by one or more embodiments of the present invention;

[0027] Figure 2 is a schematic diagram of an exploded structure of a locking device provided by one or more embodiments of the present invention;

[0028] Figure 3 is a schematic structural diagram of a locking body in a locking device provided by one or more embodiments of the present invention;

[0029] Figure 4 It is a schematic diagram of the exploded structure of the locking body provided by one or more embodiments of the present invention.

[0030] In the figure: 1 software, 2 magnetic conductive sheet, 3 wire passing block, 4 circuit board, 5 glue potting tank cover, 6 glue potting tank, 7 tightening body, 8 fastener, 9 expansion plug, 10 locking body, 11 connecting piece, 12 junction box. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0033] It should be noted that the terms herein are only intended to describe specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] Terminology explanation:

[0035] A current transformer is an instrument that converts a large current on the primary side into a small current on the secondary side for measurement based on the principle of electromagnetic induction. It is mainly composed of an iron core, a primary winding (primary coil), a secondary winding (secondary coil), wiring terminals, and insulating supports. When current passes through the primary winding, a magnetic flux is generated in the iron core, and this magnetic flux passes through the secondary winding, thereby generating an induced electromotive force in the secondary winding. By measuring the current in the secondary winding, the current in the primary winding can be obtained.

[0036] The magnetic induction chip current sensor uses the magnetic field sensing principle to measure and monitor the current in the conductor. Hall effect sensors, magnetoresistive sensors or other magnetic field-based technologies are used to detect the presence and magnitude of current passing through the conductor. The main components include a magnetic induction chip (i.e., Hall element or magnetoresistive element), a signal processing circuit, and a packaging structure. The magnetic induction chip is the core component of the sensor, responsible for sensing magnetic field changes and converting them into electrical signals. The signal processing circuit amplifies, filters, and calibrates the electrical signal output by the chip to obtain accurate current measurements. The packaging structure protects the sensor from the influence of the external environment and ensures that it can work stably.

[0037] As introduced in the background technology, cables are equipped with various sensors to detect current, such as common current transformers. Since current transformers have a fixed diameter and can usually only detect the current of one phase by induction, they cannot be directly used in three-phase cables.

[0038] In view of the above problems, when a magnetic induction chip current sensor is used to measure the current of a three-phase cable, it will be affected by the difference in cable diameter, making it difficult to fix it on the cable.

[0039] Therefore, the following embodiments provide a sensor locking device and method for a three-phase cable, so that the magnetic induction chip current sensor can be reliably locked onto the three-phase cable and can adapt to the diameters of various three-phase cables.

[0040] Embodiment 1:

[0041] A sensor locking device for a three-phase cable comprises at least three locking bodies 10 connected end to end to form a ring, wherein the outer circumference of one locking body 10 is connected to a junction box 12 via a connector 11, and two adjacent groups of locking bodies 10 are movably connected via an expansion plug 9.

[0042] The locking body 10 includes two groups of tightening bodies 7 arranged in parallel, a glue pouring slot cover 5 is provided between the two tightening bodies 7, the contact surface between the tightening body 7 and the glue pouring slot cover 5 is an inclined surface, the glue pouring slot cover 5 is connected to the glue pouring slot 6 located in the space below, a wire passing block 3 is provided in the groove on the upper top surface of the glue pouring slot cover 5, the space formed by the glue pouring slot 6 and the glue pouring slot cover 5 is used to accommodate a circuit board 4 with a magnetic induction chip, and the wires led out of the circuit board 4 pass through the wire passing block 3 and are connected to the junction box 12.

[0043] Both tightening bodies 7 are arc-shaped. A magnetic conductive sheet 2 is arranged on the inner side of the arc after the tightening body 7 is connected to the glue injection groove 6. A soft body 1 is arranged on the inner surface of the magnetic conductive sheet 2. The soft body 1 includes a magnetic core and a protective layer wrapped around the outer surface of the magnetic core.

[0044] The fastener 8 passes through the tightening body 7 and is connected to the wire passing block 3. Through the tightening action of the fastener 8, the two sets of tightening bodies 7 move toward the direction close to the glue pouring groove 6. Under the action of the inclined surface between the tightening body 7 and the glue pouring groove cover 5, the glue pouring groove 6 together with the magnetic conductive sheet 2 and the software 1 move toward the direction close to the cable, so that they can reliably fit and lock cables of different diameters.

[0045] Specifically, the fastener 8 passes through one set of tightening bodies 7 and is connected to one side of the wire passing block 3, and the other fastener 8 passes through another set of tightening bodies 7 and is connected to the other side of the wire passing block 3. By tightening the fastener 8, the two sets of tightening bodies 7 move toward the direction close to the glue pouring groove 6, and the contact surface between the tightening body 7 and the glue pouring groove cover 5 is an inclined surface, so that the components on the glue pouring groove 6 move toward the direction close to the cable, thereby making the magnetic sheet 2 and the software 1 on the glue pouring groove 6 reliably fit and lock cables of different diameters.

[0046] In this embodiment, the sensor locking device of the three-phase cable includes a locking device body, a magnetic core, a magnetic induction chip and other components that can be installed on the outer surface of the cable. The three magnetic induction chips are evenly distributed around the cable at 120 degrees, and after being adjusted to the optimal sensing position, they are locked at different positions on the cable surface, so as to cope with cables of different diameters.

[0047] The magnetic core in the software 1 can be made of different materials such as silicon steel sheet, Permalloy, silicon steel sheet, etc., and is formed by arranging multiple layers in parallel. Since each layer of steel sheet is very thin, it has a certain elasticity and can adapt to various cable diameters.

[0048] The locking device body can be made of different materials such as metal or non-metal.

[0049] like Figure 1-Figure 2 As shown, the locking device body includes at least three locking bodies 10 connected end to end to form a ring, wherein the outer circumferential side of one locking body 10 is connected to the junction box 12 via a connecting piece 11, and two adjacent groups of locking bodies 10 are movably connected via an expansion plug 9.

[0050] like Figure 3-Figure 4 As shown, the locking body 10 includes two groups of tightening bodies 7 arranged in parallel, a glue pouring groove 6 is provided between the two tightening bodies 7, a glue pouring groove cover 5 is provided on the upper top surface of the glue pouring groove 6, a wire passing block 3 is provided on the upper top surface of the glue pouring groove cover 5, and the space formed by the glue pouring groove 6 and the glue pouring groove cover 5 is used to accommodate a circuit board 4 with a magnetic induction chip, and the lines led out of the circuit board 4 pass through the wire passing block 3 and enter the junction box 12, and the wire passing block 3 has an internal threaded hole required for connection with the fastener 8, and the two tightening bodies 7 are both arc-shaped, and a magnetic conductive sheet 2 is provided on the inner side of the circumference, and a software 1 is provided on the inner side of the circumference of the magnetic conductive sheet 2.

[0051] In this embodiment, three locking bodies 10 are connected end to end to form a ring, which is enclosed on the outer side of the circumference of the cable. The glue filling groove cover 5 and the glue filling groove 6 in each locking body 10 form a cavity for accommodating the circuit board 4. The circuit board 4 is provided with a magnetic induction chip and is sealed by glue filling to achieve an IP68 protection level. After glue filling, the glue filling groove cover 5 is covered to make the circuit board 4, the glue filling groove cover 5 and the glue filling groove 6 become a whole. The formed whole is clamped by two tightening bodies 7 and then inserted into the fastener 8 for fixation.

[0052] At the same time, the glue pouring groove 6 and the glue pouring groove cover 5 are provided with slide rails for guiding the tightening body 7 to be docked and installed, and the tightening body 7 is provided with slide grooves corresponding to the slide rails.

[0053] The two tightening bodies 7 are arc-shaped, and the inner side of the arc will contact the outer surface of the cable. In order to enable the magnetic field generated by the cable conductor to be captured by the magnetic induction chip in the circuit board 4, a magnetic conductive sheet 2 is provided on the inner side of the tightening body 7.

[0054] The magnetic conductive sheet 2 is usually made of a rigid material. In order to ensure that the magnetic conductive sheet 2 can reliably fit the outer surface of the cable and does not damage the outer insulation of the cable, a software 1 is provided on the inner side of the circumference of the magnetic conductive sheet 2 to buffer and help the magnetic conductive sheet 2 better fit the outer surface of the cable.

[0055] The wires led out from the circuit board 4 pass through the wire block 3 and are introduced into the junction box 12 , and are connected to an external data processor through the junction box 12 via wires.

[0056] The three groups of locking bodies 10 are connected by expansion plugs 9 and installed on the cable to form an annular locking structure, which is not locked with the cable at this time. At this time, the position of the conductor in the three-phase cable is determined by the current signal obtained by detection. When the current signal obtained by a circuit board 4 with a magnetic induction chip is the largest, it means that the magnetic induction chip is closest to the core wire of the cable, and the fastener 8 can be rotated to make the tightening body 7 move toward the glue pouring groove 6. Since the contact surface between the tightening body 7 and the glue pouring groove cover 5 is an inclined surface, when the fastener 8 passes through the tightening body 7 and is connected to the wire passing block 3, the tightening body 7 is pulled toward the direction close to the glue pouring groove cover 5 (at this time, the glue pouring groove cover 5 and the glue pouring groove 6 have been integrated) by tightening the fastener 8, and the inclined surface between the tightening body 7 and the glue pouring groove 6 is used to push the connected parts on the glue pouring groove 6 to move toward the direction close to the cable, and by operating the fasteners 8 in the three groups of locking bodies 7, the glue pouring groove cover 5, the glue pouring groove 6, the magnetic conductive sheet 2 and the software 1 in the three groups of locking bodies 7 move centripetally at a distribution of 120 degrees and close to the cable, and the entire device is locked on the cable.

[0057] Since the three groups of conductors in the three-phase three-wire cable are evenly distributed at 120° on the circumference, which is consistent with the arrangement angle of the three groups of locking bodies 10 in this embodiment, after one group of locking bodies 10 is positioned, the remaining two groups of locking bodies 10 are also positioned, and the expansion plug 9 is an elastic component that can provide a certain margin for the connection between the two adjacent groups of locking bodies 10, so that the diameter of the ring surrounded by the three groups of locking bodies 10 can vary within a certain range, and the inclined surface between the tightening body 7 and the glue filling slot cover 5 is in the opposite direction. The arrangement is that two groups of tightening bodies 7 are respectively located at the front and rear ends of the glue filling slot cover 5, and the contact area between each group of tightening bodies 7 and the glue filling slot cover 5 is an inclined surface. When the two groups of tightening bodies 7 are clamping the glue filling slot cover 5, the axial movement generated by the fastener 8 passes through the two pairs of inclined surfaces, and the glue filling slot cover 5 is converted into a radial movement toward the cable direction, so that the magnetic sheet 2 on the glue filling slot cover 5 together with the software 1 can reliably fit with the surface of cables of different diameters, thereby realizing that the three groups of locking bodies 10 are locked to the cable and cope with the diameter change of the cable. Finally, the junction box 12 is connected to the connector 11, and the connector 11 is connected to the locking device with an expansion plug 9.

[0058] In the above device, the magnetic core in the software 1 is used to sense the magnetic field generated by the current passing through the cable conductor. The acquired magnetic field information is transmitted to the chip in the circuit board 4 by wired or wireless means for processing. The acquired current information is transmitted to the junction box 12 via the line led out from the circuit board 4, and the corresponding cable current information is collected by connecting to the data collector through the junction box 12.

[0059] Embodiment 2:

[0060] A sensor locking method for a three-phase cable comprises the following steps:

[0061] The circuit board 4 with the magnetic induction chip is installed in the cavity of the glue filling tank cover 5 and the glue filling tank 6. After the glue filling treatment, the circuit board 4, the glue filling tank cover 5 and the glue filling tank 6 form a whole. The wire passing block 3 is installed on the top surface of the glue filling tank cover 5, and the lead wire of the circuit board 4 passes through the wire passing block 3. The formed whole is clamped by two tightening bodies 7 and then inserted into the fastener 8 for fixing.

[0062] The three groups of locking bodies 10 are connected by expansion plugs 9 to form a ring-shaped locking structure and installed on the cable. The current signal obtained by the circuit board 4 with a magnetic induction chip is used to determine the position of the conductor in the three-phase cable.

[0063] When the current signal obtained by a certain circuit board 4 is the largest, it means that the magnetic induction chip is closest to the core wire of the cable, and the corresponding locking body 10 is locked on the cable through the fastener 8;

[0064] The remaining locking bodies 10 are then locked onto the cables by means of the fasteners 8 , the junction box 12 is connected to the connecting piece 11 , and the connecting piece 11 is connected to the locking device.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sensor locking device for a three-phase cable, characterized in that: It comprises at least three locking bodies connected end to end to form a ring, wherein the outer circumference of one locking body is connected to the junction box through a connecting piece, and two adjacent sets of locking bodies are movably connected; The locking body comprises at least two groups of tightening bodies arranged in parallel, a glue pouring groove is provided between the two tightening bodies, a glue pouring groove cover is provided on the upper top surface of the glue pouring groove, a wire passing block is provided on the upper top surface of the glue pouring groove cover, the space formed by the glue pouring groove and the glue pouring groove cover is used to accommodate the circuit board, the wires led out of the circuit board pass through the wire passing block and are connected to the junction box, a magnetic conductive sheet is provided on the inner side of the arc after the tightening body is connected to the glue pouring groove, and a software is provided on the inner surface of the magnetic conductive sheet.

2. A sensor locking device for a three-phase cable as claimed in claim 1, characterized in that: Both tightening bodies are arc-shaped.

3. A sensor locking device for a three-phase cable as claimed in claim 1, characterized in that: The soft body comprises a magnetic core and a protective layer wrapped around the outer surface of the magnetic core.

4. A sensor locking device for a three-phase cable as claimed in claim 1, characterized in that: The contact surface between the tightening body and the glue pouring groove cover is an inclined surface.

5. A sensor locking device for a three-phase cable as claimed in claim 1, characterized in that: The wire passing block is located in a groove on the top surface of the glue pouring tank cover.

6. A sensor locking device for a three-phase cable as claimed in claim 1, characterized in that: A fastener is also provided, and the fastener passes through the tightening body and is connected with one side of the wire passing block.

7. A sensor locking device for a three-phase cable as claimed in claim 6, characterized in that: By tightening the fastener, the tightening body moves toward the direction close to the glue filling groove, and pushes the glue filling groove together with the magnetic sheet and the software to move toward the direction close to the cable, thereby achieving locking between the locking body and the tested cable.

8. A sensor locking device for a three-phase cable as claimed in claim 1, characterized in that: Two adjacent groups of locking bodies are movably connected via expansion plugs.

9. A sensor locking device for a three-phase cable as claimed in claim 1, characterized in that: A magnetic induction chip is arranged on the circuit board.

10. A method for implementing sensor locking based on the device according to any one of claims 1 to 9, characterized in that: The following steps are involved: The circuit board with the magnetic induction chip is installed in the cavity of the glue potting tank cover and the glue potting tank. After the glue potting treatment, the circuit board, the glue potting tank cover and the glue potting tank form a whole. The wire passing block is installed on the top surface of the glue potting tank cover, and the lead wire of the circuit board passes through the wire passing block. The formed whole is clamped by two tightening bodies and then inserted into the fastener for fixing. The three sets of locking bodies are connected by expansion plugs to form a ring-shaped locking structure and installed on the cable. The position of the conductor in the three-phase cable is determined by the current signal obtained by the circuit board with a magnetic induction chip. When the current signal obtained by a certain circuit board is the largest, it means that the magnetic induction chip is closest to the core wire of the cable, and the corresponding locking body is locked on the cable through the fastener; Continue to lock the remaining locking body onto the cable through the fasteners, connect the junction box and the connecting piece together, and connect the connecting piece to the locking device.

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