Outgoing line terminal, solid-sealed polar pole and outdoor switch

Abstract

The utility model provides an outgoing line terminal, a solid-sealed polar pole and an outdoor switch, and relates to the technical field of power distribution networks. The outgoing line terminal comprises a central conductor, a positioning piece, a current sensor and an insulating pouring layer; the positioning piece is arranged around the central conductor, and the axis of the positioning piece coincides with the axis of the central conductor; the current sensor is sleeved on the positioning piece, and the current sensor, the positioning piece and part of the central conductor are packaged in the insulating pouring layer. When the insulation pouring layer is formed by pouring, the two ends of the positioning piece in the axis direction abut against the pouring mold and are fixed front, back, left and right through the edge of the pouring mold. The current sensor is arranged on the positioning piece in a sleeving mode and is fixed in the cavity of the pouring mold through the positioning piece, and therefore accurate positioning can be achieved in the pouring process. After the insulation pouring layer is solidified and formed, the current sensor, the positioning piece and part of the center conductor which are packaged in the insulation pouring layer are kept relatively fixed, and all positions of the current sensor and the center conductor keep uniform distances, so that partial discharge is not easy to occur.

Description

Technical Field

[0001] The utility model relates to the technical field of power distribution networks, in particular to an outlet terminal, a sealed pole and an outdoor switch. Background Art

[0002] As a key component for accurate current conduction testing and protection signals with deep integration of primary and secondary systems, the current sensor adopts the Faraday electromagnetic induction principle. By changing the current in the central conductor, an electromagnetic field is generated around the central conductor, and then the induced current is converted into a recognizable current or voltage signal through a signal amplification coil.

[0003] Integrated primary and secondary products are used in power switch systems. Their operating voltage is connected to the power transmission and distribution system, often withstanding voltage levels of 10kV or even higher. In this case, the center conductor is exposed to such a high voltage, while the secondary system's derived signal is exposed to a lower voltage (normally below 36V). The voltage between the two must withstand power frequency, partial discharge, lightning surge, and other electrical requirements.

[0004] Since the current sensor and the center conductor cannot be directly connected, they need to be separated by insulating materials. The insulating materials need to play a mechanical support role and require high insulation performance. Therefore, the design and processing and manufacturing process between the current sensor and the center conductor is very important.

[0005] Existing manufacturing processes use locating pins to externally position the current sensor, securing it within the mold cavity. Insulating material is then poured into the cavity, and after the insulating material solidifies, the current sensor is connected to the center conductor. However, the current sensor's inherent dimensions are irregular, and the positioning accuracy of the locating pins is low, often leading to defects such as eccentricity. This results in uneven distances between the current sensor and the center conductor, making partial discharge more likely. Utility Model Content

[0006] In order to solve the problems existing in the prior art, one of the purposes of the present invention is to provide an outlet terminal.

[0007] The utility model provides the following technical solutions:

[0008] An outlet terminal comprises a central conductor, a positioning piece, a current sensor and an insulating casting layer;

[0009] The positioning member is arranged around the central conductor, the axis of the positioning member coincides with the axis of the central conductor, and the two ends of the positioning member along its own axis are used to abut against the casting mold;

[0010] The current sensor is sleeved on the positioning piece, and the current sensor, the positioning piece and a portion of the central conductor are encapsulated in the insulating casting layer.

[0011] As a further optional solution for the outlet terminal, the positioning member adopts a positioning net.

[0012] As a further optional solution for the outlet terminal, the positioning net is a conductive shielding net.

[0013] As a further optional solution for the outlet terminal, the positioning net is a metal shielding net.

[0014] As a further optional solution to the outlet terminal, the positioning member includes a first positioning portion and a second positioning portion;

[0015] The first positioning portion is cylindrical, the axis of the first positioning portion coincides with the axis of the central conductor, the two ends of the first positioning portion along its own axis are used to abut against the casting mold, and the current sensor is sleeved on the first positioning portion;

[0016] The second positioning portion is arranged in a ring shape, the axis of the second positioning portion coincides with the axis of the first positioning portion, the inner edge of the second positioning portion is connected to the first positioning portion, and the outer edge of the second positioning portion is used to support the casting mold.

[0017] As a further optional solution for the outlet terminal, the current sensor is held against the second positioning portion along the axial direction of the first positioning portion.

[0018] As a further optional solution for the outlet terminal, the first positioning portion is provided with first curling edges at both ends along its own axial direction, and the first curling edges are used to support the casting mold.

[0019] As a further optional solution for the outlet terminal, the outer edge of the second positioning portion is provided with a second curling edge, and the second curling edge is used to abut against the casting mold.

[0020] Another object of the present invention is to provide a sealed pole.

[0021] The utility model provides the following technical solutions:

[0022] A sealed pole comprises the above-mentioned outlet terminal.

[0023] Another object of the present utility model is to provide an outdoor switch.

[0024] The utility model provides the following technical solutions:

[0025] An outdoor switch comprises the above-mentioned sealed pole.

[0026] The embodiments of the present utility model have the following beneficial effects:

[0027] When casting the insulating casting layer, the positioning members in the terminal block bear against the casting mold at both ends along their own axis, secured by the edges of the casting mold in both the front and rear directions, with the axis of the positioning members aligning with the axis of the center conductor. Furthermore, the current sensor is mounted on the positioning members and secured within the mold cavity by the positioning members, enabling precise positioning during the casting process. After the insulating casting layer solidifies, the current sensor, positioning members, and portion of the center conductor encapsulated within the insulating casting layer remain relatively fixed, and the current sensor maintains a uniform distance from the center conductor, making partial discharge less likely to occur.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 The figure shows the overall structure of an outlet terminal provided by an embodiment of the present utility model;

[0031] Figure 2 A schematic structural diagram of a positioning member in an outlet terminal provided by an embodiment of the present utility model is shown;

[0032] Figure 3 A schematic structural diagram of a positioning member in an outlet terminal provided by an embodiment of the present utility model is shown from another perspective.

[0033] Description of main component symbols:

[0034] 100 - center conductor; 200 - positioning member; 210 - first positioning portion; 211 - first curling edge; 220 - second positioning portion; 221 - second curling edge; 300 - current sensor; 400 - insulating casting layer. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. Conversely, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0037] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0038] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the template description herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] In related technologies, metal locating pins are used to externally position the current sensor during assembly. Insulation material is then poured and cured to connect the current sensor and center conductor. After forming, the metal locating pins are removed, leaving a countersunk hole in the insulation material, exposing the current transformer at the countersunk hole. This exposed current sensor is often damaged during further processing, causing stress in its internal components and damage to key internal layers.

[0041] Alternatively, the metal dowel pins can be replaced with dowel pins made of insulating material, which remain on the surface of the insulating material after casting. This approach solves the problem of the current sensor being exposed, but the dowel pins and the insulating material are made of different materials, which increases the bonding problem. Furthermore, the dowel pins, the insulating material, and the current sensor have different thermal shrinkage rates, which creates the risk of material separation and cracking when subjected to temperature fluctuations.

[0042] In addition, no matter what form of positioning pins is used to externally position the current sensor, due to the irregular size processing of the current sensor itself, there is a problem of low positioning accuracy, and defects such as eccentricity often occur, resulting in uneven distances between the current sensor and the center conductor, which is prone to partial discharge.

[0043] Example

[0044] See also Figure 1 In order to solve the above problems, this embodiment provides an outlet terminal, which is composed of a center conductor 100, a positioning member 200, a current sensor 300 and an insulating casting layer 400.

[0045] The positioning member 200 surrounds the central conductor 100, and the axis of the positioning member 200 coincides with the axis of the central conductor 100. The two ends of the positioning member 200 along its own axis are used to abut against the casting mold, specifically against the inner wall of the casting mold cavity.

[0046] In addition, the current sensor 300 is sleeved on the positioning member 200 , and the current sensor 300 , the positioning member 200 and a portion of the central conductor 100 are encapsulated in the insulating casting layer 400 .

[0047] When casting the insulating casting layer 400, the positioning member 200 in the terminal block abuts the casting mold at both ends along its axis, secured by the edges of the casting mold in the front, back, left, and right directions. The axis of the positioning member 200 coincides with the axis of the center conductor 100. On this basis, the current sensor 300 is mounted on the positioning member 200 and secured within the casting mold cavity by the positioning member 200, allowing for precise positioning during the casting process. After the insulating casting layer 400 is cured, the current sensor 300, the positioning member 200, and a portion of the center conductor 100 encapsulated within the insulating casting layer 400 remain relatively fixed, and the current sensor 300 maintains a uniform distance from the center conductor 100, making localized discharge less likely.

[0048] Exemplarily, the insulating casting layer 400 is cast by epoxy resin.

[0049] In some embodiments, the positioning member 200 is a positioning net.

[0050] When casting the insulating casting layer 400, the mesh-shaped positioning member 200 allows the epoxy resin material to flow freely, and defects such as bubbles and shrinkage caused by poor fluidity will not appear during the casting process. At the same time, the epoxy resin material and the positioning member 200 can better contact and bond.

[0051] After the insulating casting layer 400 is solidified and formed, the positioning piece 200 of the mesh structure and the insulating casting layer 400 can be tightly combined and nested with each other, thereby having better mechanical properties.

[0052] Furthermore, the positioning net is a conductive shielding net.

[0053] The conductive shielding net is used as the positioning net, which can not only accurately position the current sensor 300 but also provide a good shielding effect, improve the electric field, and thus significantly improve the electrical performance of the product.

[0054] The conductive shielding mesh may be made of metal, carbon fiber, graphene, etc.

[0055] Optionally, the positioning net is a metal shielding net, which is formed by stamping a 0.3mm-0.6mm metal sheet, and the grids are arranged in a 2*3 rectangular array.

[0056] In addition, the metal shielding mesh can be made of a material with a temperature shrinkage rate similar to that of epoxy resin, making it suitable for higher environmental levels.

[0057] Please also refer to Figure 2 and Figure 3 In some embodiments, the positioning member 200 is composed of a first positioning portion 210 and a second positioning portion 220 .

[0058] The first positioning portion 210 is cylindrical, and its axis coincides with the axis of the central conductor 100. The first positioning portion 210 has two ends along its axis for supporting the casting mold. The current sensor 300 is mounted on the first positioning portion 210.

[0059] Furthermore, the second positioning portion 220 is annular. The axis of the second positioning portion 220 coincides with the axis of the first positioning portion 210, that is, the axis of the center conductor 100. The inner edge of the second positioning portion 220 is connected to the first positioning portion 210, and the outer edge of the second positioning portion 220 is used to abut the casting mold.

[0060] When the insulating casting layer 400 is cast, both ends of the first positioning portion 210 along its own axis and the outer edge of the second positioning portion 220 abut against the inside of the casting mold cavity, which can be better fixed by the casting mold and thus position the current sensor 300.

[0061] Furthermore, the current sensor 300 is held against the second positioning portion 220 along the axial direction of the first positioning portion 210 .

[0062] At this time, along the axial direction of the central conductor 100 , the relative position between the current sensor 300 and the central conductor 100 is controlled by the second positioning portion 220 , so that the positioning of the current sensor 300 is more accurate.

[0063] Furthermore, the first positioning portion 210 is provided with first curling edges 211 at both ends along its own axis, and the first curling edges 211 are used to support the casting mold.

[0064] The end of the first positioning portion 210 is configured as an arc-shaped first curling edge 211 , which can shield the sharp corner and make the electric field at both ends of the first positioning portion 210 uniform.

[0065] In this embodiment, the first curling edge 211 located at one end of the first positioning portion 210 is curled inward, and the first curling edge 211 located at the other end of the first positioning portion 210 is curled outward.

[0066] Similarly, a second curling edge 221 is provided on the outer edge of the second positioning portion 220 , and the second curling edge 221 is used to abut against the casting mold.

[0067] Setting the outer edge of the second positioning portion 220 as an arc-shaped second curling edge 221 can also shield the sharp corners and make the electric field of the outer edge of the second positioning portion 220 uniform.

[0068] In summary, when casting the insulating casting layer 400, the positioning member 200 in the aforementioned terminal block abuts the casting mold at both ends along its own axis, is fixed by the edges of the casting mold in the front, back, left, and right directions, and the axis of the positioning member 200 coincides with the axis of the center conductor 100. On this basis, the current sensor 300 is mounted on the positioning member 200 and secured within the casting mold cavity by the positioning member 200, allowing for precise positioning during the casting process. After the insulating casting layer 400 is cured, the current sensor 300, the positioning member 200, and a portion of the center conductor 100 encapsulated within the insulating casting layer 400 remain relatively fixed, and the current sensor 300 maintains a uniform distance from the center conductor 100, making localized discharge less likely to occur.

[0069] This embodiment further provides a sealed pole, which is applied to an outdoor switch. The sealed pole includes the above-mentioned outlet terminal.

[0070] This embodiment also provides an outdoor switch, including but not limited to a recloser and a circuit breaker, and the outdoor switch includes the above-mentioned sealed pole.

[0071] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not limiting, and thus other examples of the exemplary embodiments may have different values.

[0072] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0073] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. An outlet terminal, characterized in that: It includes a center conductor, a positioning piece, a current sensor and an insulating casting layer; The positioning member is arranged around the central conductor, the axis of the positioning member coincides with the axis of the central conductor, and the two ends of the positioning member along its own axis are used to abut against the casting mold; The current sensor is sleeved on the positioning piece, and the current sensor, the positioning piece and a portion of the central conductor are encapsulated in the insulating casting layer.

2. The outlet terminal according to claim 1, characterized in that: The positioning piece adopts a positioning net.

3. The outlet terminal according to claim 2, characterized in that: The positioning net is a conductive shielding net.

4. The outlet terminal according to claim 3, characterized in that: The positioning net is a metal shielding net.

5. The outlet terminal according to claim 3 or 4, characterized in that: The positioning member includes a first positioning portion and a second positioning portion; The first positioning portion is cylindrical, the axis of the first positioning portion coincides with the axis of the central conductor, the two ends of the first positioning portion along its own axis are used to abut against the casting mold, and the current sensor is sleeved on the first positioning portion; The second positioning portion is arranged in a ring shape, the axis of the second positioning portion coincides with the axis of the first positioning portion, the inner edge of the second positioning portion is connected to the first positioning portion, and the outer edge of the second positioning portion is used to support the casting mold.

6. The outlet terminal according to claim 5, characterized in that: The current sensor is held against the second positioning portion along an axial direction of the first positioning portion.

7. The outlet terminal according to claim 5, characterized in that: The first positioning portion is provided with first curling edges at both ends along its own axis, and the first curling edges are used to support the casting mold.

8. The outlet terminal according to claim 5, characterized in that: A second curling edge is provided on the outer edge of the second positioning portion, and the second curling edge is used to abut against the casting mold.

9. A sealed pole, characterized in that: The invention comprises the outlet terminal according to any one of claims 1 to 8.

10. An outdoor switch, characterized in that: Including the sealed pole according to claim 9.

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