Current sensor for partial discharge monitoring
By designing a current sensor with radial sliding locking plates and adjustable rotating ring plates, the problems of versatility and stability of existing current sensors are solved, enabling flexible adaptation and stable installation for different cables and improving the accuracy of monitoring data.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING YOUNENGTE ELECTRIC POWER TECH DEV
- Filing Date
- 2025-04-30
- Publication Date
- 2026-04-28
AI Technical Summary
Existing current sensors are not very versatile and are not stable during installation, resulting in poor accuracy of monitoring data.
A current sensor comprising a housing, a magnetic core assembly, a locking assembly, and a rotation limiting assembly was designed. By adjusting the radial sliding of the locking plate and rotating the rotating ring plate, it can flexibly adapt to cables of different outer diameters, and the rotation limiting assembly ensures that the sensor is securely installed.
It improves the versatility and installation stability of the sensor, reduces the difficulty of operation, and enhances the accuracy of monitoring data.
Smart Images
Figure CN224176616U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of sensor technology, specifically a current sensor for partial discharge monitoring. Background Technology
[0002] Partial discharge detection is one of the most important testing items in the daily operation of transformers, and the pulse current method is a commonly used detection method. The detection principle is as follows: when partial discharge occurs inside the transformer, the transient charge change generated at the discharge point will form a high-frequency current pulse. These pulses will propagate through the distributed capacitance between the transformer windings and the core and tank (such as the core grounding circuit). Therefore, by installing a broadband current sensor on the grounding cable, the pulse current can be converted into a measurable voltage signal using the principle of electromagnetic induction, thereby determining whether partial discharge has occurred inside the transformer.
[0003] Most current sensors currently available are ring-shaped, so they are typically installed in sets on grounding cables. However, because the outer diameter of cables varies significantly with voltage levels, current sensors of various sizes are required to accommodate different specifications. Furthermore, the inner diameter of the current sensor is generally larger than the outer diameter of the cable, making it difficult to securely fix after installation. The sensor is prone to sliding along the cable surface, affecting the accurate capture of current signals and leading to data deviations or omissions, thus compromising monitoring accuracy. Utility Model Content
[0004] The purpose of this invention is to provide a current sensor for partial discharge monitoring, which solves the technical problems of low versatility and unstable installation in existing technologies.
[0005] This utility model discloses a current sensor for partial discharge monitoring, comprising:
[0006] The box body is circular in shape, and multiple linear grooves are formed on its end face. One end of the linear groove is close to the inner periphery of the box body, the other end is close to the outer periphery of the box body, and the axis is off-center from the center of the box body.
[0007] The output interface is located on the outer periphery of the housing;
[0008] The magnetic core assembly is installed inside the housing and electrically connected to the output interface;
[0009] A locking component, disposed on the end face of the housing, includes:
[0010] A rotating ring plate is coaxially mounted on the end face of the box body, and its outer surface has multiple movable holes.
[0011] Multiple locking plates are radially slidably disposed on the outer surface of the rotating ring plate;
[0012] A rotation limiting component is fixedly connected to the rotating ring plate and is used to limit the rotation of the rotating ring plate;
[0013] The locking plate, the movable hole, and the linear slide groove are in one-to-one correspondence and are evenly distributed around the center of the rotating ring plate. The locking plate is provided with a guide post, which passes through the movable hole and forms a sliding fit with the linear slide groove.
[0014] This application allows for flexible adaptation to cables of different outer diameters through radial sliding adjustment of the locking plates, significantly improving versatility. By rotating the rotating ring plate, all locking plates can be driven to slide and adjust simultaneously, thereby reducing operational difficulty, improving adjustment efficiency, and fixing the cable in the center position, thus improving the accuracy of monitoring data. Furthermore, the rotation of the rotating ring plate is restricted by the rotation limiting component, ensuring the stability of the sensor after installation.
[0015] Based on the above technical solution, the solution of this application can be further improved as follows:
[0016] Preferably, there are two locking components, which are symmetrically arranged at both ends of the box. By using this solution, the sensor is more evenly stressed during installation, which improves the stability of the fixation.
[0017] Preferably, a plurality of connecting pieces are provided between the two rotating ring plates, and the connecting pieces are circumferentially attached to the outer periphery of the box. This solution provides radial limiting for the rotating ring plates, allowing them to rotate freely and keeping the two rotating ring plates rotating synchronously, simplifying the adjustment operation and improving the stability of the clamping and fixing.
[0018] Preferably, the rotation limiting components are installed one-to-one on the connecting pieces, and the rotation limiting components include:
[0019] A screw is threaded onto the connecting piece and passes through the connecting piece;
[0020] The knob is installed at the external end of the screw. This design has the advantages of simple structure, convenient adjustment and flexible locking position, which facilitates practical use and operation.
[0021] Preferably, a support platform is integrally formed on the connecting piece, and the support platform is coaxially arranged with the screw. By adopting this solution, the structural strength of the connection area between the connecting piece and the screw can be enhanced, thereby improving the structural stability and extending the service life.
[0022] Preferably, the rotating ring plate has multiple guide grooves on its outer side, and the locking pieces are slidably connected to the guide grooves one by one. With this solution, the locking pieces can be guided to slide radially and play a circumferential limiting and supporting role, thereby improving the load-bearing capacity of the locking pieces.
[0023] Preferably, the inner wall of the guide groove is provided with a limiting strip, and the outer wall of the locking piece is provided with a corresponding limiting groove, and the limiting strip and the limiting groove form a sliding fit; this solution plays a role in limiting and preventing the locking piece from detaching from the guide groove, and its structure is simple and compact with low production cost.
[0024] Preferably, the outer periphery of the housing extends radially to form an isosceles trapezoidal mounting portion, and the output interface is located on the side of the mounting portion away from the housing. This solution disperses stress concentration in the output interface mounting area and forms a connection space between the output interface and the magnetic core assembly, ensuring stable connection.
[0025] Through the above technical solution, this utility model achieves the following beneficial effects:
[0026] This application allows for flexible adaptation to cables of different outer diameters through radial sliding adjustment of the locking plates, significantly improving versatility. By rotating the rotating ring plate, all locking plates can be driven to slide and adjust simultaneously, thereby reducing the difficulty of operation, improving adjustment efficiency, and fixing the cable in the center position, thus improving the accuracy of monitoring data. Furthermore, the rotation of the rotating ring plate 41 is restricted by the rotation limiting component, ensuring the stability of the sensor after installation. Attached Figure Description
[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0028] Figure 1 This is a top view of the current sensor for partial discharge monitoring described in a specific embodiment of this application;
[0029] Figure 2 for Figure 1 The top view of the partial discharge monitoring current sensor after the locking plate has been removed;
[0030] Figure 3 for Figure 1 The top view of the housing in the current sensor for partial discharge monitoring is shown.
[0031] Figure 4 for Figure 1 The diagram shows a cross-sectional view of AA in the current sensor used for partial discharge monitoring.
[0032] Figure 5 for Figure 1 A schematic cross-sectional view of BB in the current sensor for partial discharge monitoring is shown.
[0033] Figure 6 for Figure 1 The top view of the partial discharge monitoring current sensor in the locked state is shown.
[0034] Explanation of reference numerals in the attached figures:
[0035] 1. Housing; 2. Output interface; 3. Magnetic core assembly; 4. Locking assembly; 5. Rotation limiting assembly; 6. Connecting piece;
[0036] 101. Linear slide; 11. Mounting part; 41. Rotating ring plate; 411. Movable hole; 412. Guide groove; 413. Limiting strip; 42. Locking plate; 421. Guide post; 422. Limiting groove; 51. Screw; 52. Knob; 61. Support platform. Detailed Implementation
[0037] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.
[0038] First, it should be noted that some directional terms used in the following description to clearly illustrate the technical solution of this utility model, such as the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," are all derived from the normal orientation of the components in the partial discharge monitoring current sensor. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0039] In this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" 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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0040] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.
[0041] Example:
[0042] like Figures 1-6As shown in the figure, this application discloses a current sensor for partial discharge monitoring, which is used to be mounted on a grounding cable and converts pulse current into a measurable voltage signal using the principle of electromagnetic induction. It has the advantages of strong adaptability and stable installation. Its specific structure includes: a housing 1, an output interface 2, a magnetic core assembly 3, a locking assembly 4, and a rotation limiting assembly 5.
[0043] The box 1 is circular and has a circular through hole for the cable to pass through. Multiple linear grooves 101 are provided on its end face along the circumference. One end of the linear groove 101 is close to the inner circumference of the box 1, and the other end is close to the outer circumference of the box 1. The axis is off the center of the box 1, which facilitates the radial sliding adjustment of the locking plate 42.
[0044] Output interface 2 is located on the outer periphery of housing 1 and is used to transmit the current signal collected by magnetic core assembly 3 and facilitate connection with external monitoring equipment.
[0045] The magnetic core assembly 3 is installed inside the housing 1 and electrically connected to the output interface 2. It is used to collect the current signal in the cable through the principle of electromagnetic induction and convert it into an electrical signal for output.
[0046] The locking component 4 is located on the end face of the housing 1 and is used to securely lock the sensor to the cable to prevent slippage. Its structure includes a rotating ring plate 41 and multiple locking plates 42.
[0047] Specifically, the rotating ring plate 41 is coaxially disposed on the end face of the box body 1 and can rotate around the central axis. Multiple movable holes 411 are opened on its outer surface for the guide post 421 to pass through.
[0048] Preferably, the movable hole 411 is elongated, with its axis passing through the center of the rotating ring plate 41 and adapted to the guide post 421, so as to limit and guide the guide post 421.
[0049] Specifically, multiple locking plates 42 are radially slidably disposed on the outer surface of the rotating ring plate 41, such that the sliding direction of each locking plate 42 passes through the center of the rotating ring plate 41, for clamping and fixing the cable.
[0050] Among them, the locking plate 42, the movable hole 411 and the linear slide groove 101 correspond one to one and are evenly distributed around the center of the rotating ring plate 41. The locking plate 42 is provided with a guide post 421, which passes through the movable hole 411 and forms a sliding fit with the linear slide groove 101. Thus, the rotation of the rotating ring plate 41 drives the locking plate 42 to perform radial sliding adjustment.
[0051] The rotation limiting component 5 is fixedly connected to the rotating ring plate 41 to limit the rotation of the rotating ring plate 41, thereby fixing the position of the locking piece 42 and ensuring that the sensor is securely locked on the cable.
[0052] like Figure 1 and Figure 6As shown, the installation process of the above technical solution is as follows:
[0053] 1. Mount the sensor onto the cable and adjust it to the appropriate position;
[0054] 2. Rotate the rotating ring plate 41. The rotating ring plate 41 drives the locking plate 42 to rotate together, which in turn drives the guide post 421 to slide along the linear slide groove 101. Due to the guiding effect of the linear slide groove 101, the sliding of the guide post 421 is converted into the linear movement of the locking plate 42 in the radial direction until the locking plate 42 is in close contact with the outer surface of the cable.
[0055] 3. Use the rotation limiting component 5 to fix the rotating ring plate 41 to prevent it from rotating relative to the box 1, thereby locking the sensor position.
[0056] like Figure 1 and Figure 4 As shown, the monitoring process of the above technical solution is as follows:
[0057] The magnetic core assembly 3 collects the current signal in the cable and transmits it to the external monitoring equipment through the output interface 2 to realize partial discharge monitoring.
[0058] This invention allows for flexible adaptation to cables of different outer diameters through radial sliding adjustment of the locking plate 42, significantly improving versatility. By rotating the rotating ring plate 41, all locking plates 42 can be driven to slide and adjust simultaneously, thereby reducing the difficulty of operation, improving adjustment efficiency, and fixing the cable in the center position, thus improving the accuracy of monitoring data. Furthermore, the rotation limiting component 5 restricts the rotation of the rotating ring plate 41, ensuring the stability of the sensor after installation.
[0059] In some embodiments, such as Figure 4 and Figure 5 As shown, there are two locking components 4, which are symmetrically arranged at both ends of the box 1. The symmetrical fixing at both ends makes the sensor more evenly stressed during installation, thus improving the stability of the fixation.
[0060] Based on the above embodiments, such as Figure 4 and Figure 5 As shown, a plurality of connecting pieces 6 are provided between the two rotating ring plates 41, and the connecting pieces 6 are attached to the outer periphery of the box body 1 in the circumferential direction.
[0061] By setting the connecting piece 6, the rotating ring plate 41 is radially limited, allowing it to rotate freely and ensuring that the two rotating ring plates 41 rotate synchronously. This simplifies the adjustment operation and improves the stability of the clamping and fixing.
[0062] Based on the above embodiments, such as Figure 1 , Figure 2 and Figure 4As shown, the rotation limiting components 5 are installed one-to-one on the connecting pieces 6. The rotation limiting components 5 include:
[0063] The screw 51 is threaded onto the connecting piece 6 and passes through the connecting piece 6;
[0064] Knob 52 is mounted on the external end of screw 51.
[0065] In use, by turning the knob 52, the screw 51 can be driven to rotate into the connecting piece 6, so that it makes close contact with the outer periphery of the box 1, thereby limiting the rotation of the rotating ring plate 41.
[0066] The design of the aforementioned rotation limiting component 5 has the advantages of simple structure, convenient adjustment and flexible locking position, which facilitates practical use and operation.
[0067] In this embodiment, as Figure 1 , Figure 2 and Figure 4 As shown, a support platform 61 is integrally formed on the connecting piece 6, and the support platform 61 is coaxially arranged with the screw 51.
[0068] By setting up the support platform 61, the structural strength of the connection area between the connecting piece 6 and the screw 51 can be enhanced, thereby improving the structural stability and extending the service life.
[0069] In this embodiment, as Figure 1 , Figure 2 and Figure 5 As shown, the rotating ring plate 41 has multiple guide grooves 412 on its outer side, and the locking pieces 42 are slidably connected to the guide grooves 412 one by one.
[0070] By setting the guide groove 412, the locking piece 42 can be guided to slide radially and play a circumferential limiting and supporting role, thereby improving the load-bearing capacity of the locking piece 42.
[0071] In this embodiment, as Figure 2 , Figure 5 and Figure 6 As shown, the inner wall of the guide groove 412 is provided with a limiting strip 413, and the outer wall of the locking piece 42 is provided with a corresponding limiting groove 422. The limiting strip 413 and the limiting groove 422 form a sliding fit.
[0072] The limiting strip 413 and the limiting groove 422 serve to limit and prevent the locking piece 42 from detaching from the guide groove 412. Moreover, its structure is simple and compact, and its production cost is low.
[0073] In some embodiments, such as Figure 3 As shown, the outer periphery of the box 1 extends radially to form an isosceles trapezoidal mounting portion 11, and the output interface 2 is located on the side of the mounting portion 11 away from the box 1.
[0074] By setting the mounting part 11, the stress concentration in the mounting area of the output interface 2 is dispersed, and a connection space is formed between the output interface 2 and the magnetic core assembly 3, ensuring a stable connection.
[0075] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.
[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.
Claims
1. A current sensor for partial discharge monitoring, characterized in that, include: The box body is circular in shape, and multiple linear grooves are formed on its end face. One end of the linear groove is close to the inner periphery of the box body, the other end is close to the outer periphery of the box body, and the axis is off-center from the center of the box body. The output interface is located on the outer periphery of the housing; The magnetic core assembly is installed inside the housing and electrically connected to the output interface; A locking component, disposed on the end face of the housing, includes: A rotating ring plate is coaxially mounted on the end face of the box body, and its outer surface has multiple movable holes. Multiple locking plates are radially slidably disposed on the outer surface of the rotating ring plate; A rotation limiting component is fixedly connected to the rotating ring plate and is used to limit the rotation of the rotating ring plate; The locking plate, the movable hole, and the linear slide groove are in one-to-one correspondence and are evenly distributed around the center of the rotating ring plate. The locking plate is provided with a guide post, which passes through the movable hole and forms a sliding fit with the linear slide groove.
2. The current sensor for partial discharge monitoring according to claim 1, characterized in that, The number of locking components is two, and they are symmetrically arranged at both ends of the box body.
3. The current sensor for partial discharge monitoring according to claim 2, characterized in that, Multiple connecting pieces are provided between the two rotating ring plates, and the connecting pieces are circumferentially attached to the outer periphery of the box.
4. The current sensor for partial discharge monitoring according to claim 3, characterized in that, The rotation limiting components are installed one-to-one on the connecting pieces, and the rotation limiting components include: A screw is threaded onto the connecting piece and passes through the connecting piece; A knob is installed on the external end of the screw.
5. The current sensor for partial discharge monitoring according to claim 4, characterized in that, The connecting piece has an integrally formed support platform, which is coaxially arranged with the screw.
6. The current sensor for partial discharge monitoring according to claim 1, characterized in that, The rotating ring plate has multiple guide grooves on its outer side, and the locking pieces are slidably connected to the guide grooves one by one.
7. The current sensor for partial discharge monitoring according to claim 6, characterized in that, The inner wall of the guide groove is provided with a limiting strip, and the outer wall of the locking piece is provided with a corresponding limiting groove. The limiting strip and the limiting groove form a sliding fit.
8. The current sensor for partial discharge monitoring according to claim 1, characterized in that, The outer periphery of the box extends radially to form an isosceles trapezoidal mounting portion, and the output interface is located on the side of the mounting portion away from the box body.