Power cable termination for gis equipment or transformers

Abstract

The utility model discloses a kind of power cable terminal for GIS equipment or transformer, comprising: bushing;Stress cone assembly is set in bushing, stress cone assembly can be operated from the bottom end of bushing and extracted;Binding post is set in bushing and is located above stress cone assembly, binding post is used to connect with the cable that is threaded in stress cone assembly, binding post can be extracted with cable when cable is extracted from bushing downwards;Conductive assembly is threaded in the top of bushing, and conductive assembly is separably and conductively matched with binding post.When stress cone assembly needs to be replaced when damaged, stress cone assembly, cable and binding post can be pulled out from bushing in turn, without separating entire power cable terminal for GIS equipment or transformer and the equipment connected therewith, convenient operation.

Description

Technical Field

[0001] This utility model relates to the field of cable accessories technology, and in particular to a power cable terminal for GIS equipment or transformers. Background Technology

[0002] In power systems, gas-insulated switchgear (GIS) is widely used in critical scenarios such as high-voltage transmission, distribution networks, and substations due to its small footprint, excellent insulation performance, and high operational reliability. GIS terminals for power cables, as the core component connecting GIS equipment and power cables, undertake important functions such as insulation protection, electric field homogenization, and current conduction. Their operational stability directly affects the safe power supply of the entire power system.

[0003] In related technologies, GIS terminals for power cables typically include core structures such as bushings and stress cone assemblies. Among these, the stress cone assembly is a key component for mitigating electric field concentration at the cut-off point of the cable insulation shield. However, traditional GIS terminals for power cables have significant structural design flaws: their stress cone assemblies are often integrated with the bushing using a fixed assembly method, meaning the stress cone assembly forms a non-removable connection with the bushing at the factory. While this design meets the initial assembly tightness requirements, during actual operation, the stress cone assembly is prone to aging, damage, localized wear, or decreased insulation performance due to long-term exposure to electric fields, environmental temperature changes, mechanical vibration, or cable thermal expansion and contraction. In such cases, replacement is necessary to ensure the normal operation of the GIS terminal.

[0004] When it is necessary to replace the stress cone assembly of a traditional GIS terminal, operators face many difficult problems: First, since the stress cone assembly is fixedly connected to the sleeve, it cannot be removed from the sleeve alone. The entire GIS terminal must be disassembled from the connection system between the GIS equipment and the cable. The disassembly cycle is long (usually several hours to several days), resulting in long-term power outages in the power system, which seriously affects the reliability of power supply and the user's power experience. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a power cable terminal for GIS equipment or transformers that facilitates the disassembly of the stress cone assembly.

[0006] A power cable terminal for GIS equipment or transformers according to some embodiments of the present invention includes: a bushing; a stress cone assembly disposed within the bushing, the stress cone assembly being operably removable from the bottom end of the bushing; a terminal block disposed within the bushing and above the stress cone assembly, the terminal block being used to connect to a cable passing through the stress cone assembly, the terminal block being removable along with the cable when the cable is pulled downwards from the bushing; and a conductive component disposed at the top of the bushing, the conductive component being detachably conductively engaged with the terminal block.

[0007] The power cable terminal for GIS equipment or transformers according to the embodiments of the present utility model has at least the following beneficial effects: In the power cable terminal for GIS equipment or transformers of this utility model, when the stress cone assembly is damaged and needs to be replaced, the stress cone assembly, cable and terminal block can be pulled out from the sleeve in sequence without separating the entire power cable terminal for GIS equipment or transformers and the equipment connected to it, which is convenient to operate.

[0008] According to some embodiments of the present invention, the conductive component is interference-fitted with the sleeve.

[0009] According to some embodiments of the present invention, the terminal block is inserted into the bottom of the conductive component.

[0010] According to some embodiments of the present invention, the bottom end of the conductive component is provided with a socket, and the terminal block is removably inserted into the socket.

[0011] According to some embodiments of the present invention, the conductive component includes a conductive sleeve and an extension rod connected to the top of the conductive sleeve. The conductive sleeve passes through the top of the sleeve and the extension rod protrudes outside the sleeve. The conductive sleeve and the terminal are detachably electrically engaged.

[0012] According to some embodiments of the present invention, the conductive component further includes a shielding cover sleeved on the side of the extension rod.

[0013] According to some embodiments of the present invention, the power cable terminal for GIS equipment or transformer further includes a stop sleeve, which is disposed inside the sleeve and connected between the terminal block and the stress cone assembly.

[0014] According to some embodiments of the present invention, a portion of the structure of the stop sleeve is located directly below the terminal block, and a portion of the structure of the stop sleeve is located directly above the stress cone assembly.

[0015] According to some embodiments of the present invention, the stress cone assembly is interference-fitted with the sleeve.

[0016] According to some embodiments of the present invention, the stress cone assembly includes a stress cone disposed within the sleeve and a cone support for supporting the stress cone.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of a power cable terminal for GIS equipment or transformer according to an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of a portion of the figure shown; Figure 3 This is a schematic diagram of the structure of a power cable terminal for GIS equipment or transformer according to another embodiment of the present invention; Figure 4 for Figure 3 A magnified view of a portion of the figure shown; Figure 5 This is a schematic diagram of the structure of a power cable terminal and a transformer for GIS equipment or transformer according to an embodiment of the present invention; Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0019] Icon labels: 10. Cables; 20. Transformer; 21. Interface; 100. Sleeve; 200, Stress cone assembly; 210, Stress cone; 220, Cone support; 300, terminal block; 400. Conductive component; 410. Conductive sleeve; 411. Socket; 420. Extension rod; 430. Shielding cover; 440. Conductive connector; 500, tailpipe; 600. Grounding hardware; 700, stop sleeve. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Example 1 like Figure 1 As shown, the power cable terminal for GIS equipment or transformers provided in Embodiment 1 of this utility model includes a bushing 100, a stress cone assembly 200, a terminal block 300, and a conductive assembly 400.

[0024] The sleeve 100 is a tubular structure and is the core insulation and protection component for the power cable terminal of GIS equipment or transformer. Its main function is to isolate the live conductor from the external environment (such as air, soil, oil), prevent electric field concentration breakdown, and protect the end of the cable 10 from mechanical damage, dirt, moisture and other corrosion. It is a key structure to ensure the safe operation of the cable system.

[0025] The stress cone assembly 200 is disposed inside the sleeve 100.

[0026] Specifically, the stress cone assembly 200 allows the cable 10 to pass through, and the stress cone assembly 200 can improve the "electric field concentration problem" at the cut of the insulation shield layer of the cable 10.

[0027] Specifically, the stress cone assembly 200 includes a stress cone 210 disposed within the sleeve 100 and a cone support 220 disposed within the sleeve 100, the cone support 220 being used to support the stress cone 210.

[0028] It is understandable that the cable 10 can be inserted from bottom to top into the stress cone 210, which is used to fit around the cable 10 to improve the "electric field concentration problem" at the cut of the cable 10's insulation shield layer.

[0029] Furthermore, the stress cone assembly 200 can be operatively pulled out from the bottom end of the sleeve 100. It is understood that the stress cone assembly 200 is interference-fitted with the sleeve 100, and the stress cone assembly 200 can be pulled out from the bottom end of the sleeve 100. Specifically, the stress cone 210 is interference-fitted with the sleeve 100, and this interference fit ensures that the stress cone 210 fits tightly against the inner wall of the sleeve 100, preventing air gaps from forming.

[0030] The terminal block 300 is disposed inside the sleeve 100 and located above the stress cone assembly 200.

[0031] Understandably, cable 10 enters the stress cone assembly 200 from below and exits from above to connect with terminal 300. Specifically, the cable conductor is exposed at the end of cable 10, and the cable conductor is crimped together with terminal 300. This crimping connection allows for surface contact between the cable conductor and terminal 300, reducing contact resistance, minimizing heat loss during current flow, and ensuring connection strength to prevent loosening due to short-circuit electrodynamics. Terminal 300 can be pulled out along with cable 10 when cable 10 is withdrawn downwards from sleeve 100. Understandably, when stress cone assembly 200 is withdrawn from the bottom of sleeve 100, pulling cable 10 downwards allows cable 10 and terminal 300 to be pulled out together from the bottom of sleeve 100.

[0032] The conductive component 400 is inserted through the top of the sleeve 100, and the conductive component 400 can be detachably conductively engaged with the terminal 300.

[0033] Specifically, the conductive component 400 is installed at the top of the sleeve 100, and contacts the terminal 300. The terminal 300 is used to electrically connect the conductive component 400 and the cable 10. The conductive component 400 is used to connect with other devices, such as the transformer 20. When the terminal 300 moves downward with the cable 10, the terminal 300 separates from the conductive component 400, and the two disconnect.

[0034] In the power cable terminal for GIS equipment or transformers of this utility model, when the stress cone assembly 200 is damaged and needs to be replaced, the stress cone assembly 200, cable 10 and terminal block 300 can be pulled out from the sleeve 100 in sequence without separating the entire power cable terminal for GIS equipment or transformers and the equipment connected to it, which is convenient to operate.

[0035] Combination Figure 1 and Figure 2 In some embodiments, the terminal 300 is inserted into the bottom of the conductive component 400. Specifically, the bottom end of the conductive component 400 is provided with a socket 411, and the terminal 300 is inserted into the socket 411.

[0036] Understandably, the terminal 300 is removably inserted into the socket 411 at the bottom of the conductive component 400, and the terminal 300 contacts the wall of the socket 411 to make the terminal 300 electrically connected to the conductive component 400.

[0037] Specifically, the conductive component 400 includes a conductive sleeve 410 and an extension rod 420 connected to the top of the conductive sleeve 410. The conductive sleeve 410 passes through the top of the sleeve 100, with the extension rod 420 protruding outside the sleeve 100. The conductive sleeve 410 has a socket 411, and a terminal 300 passes through the socket 411 and is electrically connected to the conductive sleeve 410 in a separable manner. Specifically, the terminal 300 is inserted into the socket 411 at the bottom of the conductive sleeve 410, and the terminal 300 contacts the wall of the socket 411, so that the terminal 300 is electrically connected to the conductive sleeve 410. In addition, the terminal 300 can be pulled out from the socket 411, so that the terminal 300 is separated from the conductive sleeve 410. The extension rod 420 serves as a transition, for electrically connecting with the conductive sleeve 410, and serves as a lead-out function. In addition, the length of the extension rod 420 can be flexibly adjusted according to the specific application scenario (such as the depth of the interface 21 of the transformer 20) to avoid connection blind spots caused by insufficient length of the conductive sleeve 410, while extending the conductive path and reducing local electric field concentration.

[0038] In some embodiments, the conductive component 400 further includes a shield 430 sleeved on the side of the extension rod 420. The shield 430 is made of a semi-conductive material and can cover the connection part between the extension rod 420 and the external device to prevent surface flashover caused by electric field distortion in this area.

[0039] It should be noted that the conductive component 400 and the sleeve 100 are interference-fitted, specifically the conductive sleeve 410 and the sleeve 100 are interference-fitted.

[0040] In some embodiments, the power cable terminal for GIS equipment or transformers further includes a stop sleeve 700, which is disposed inside the sleeve 100 and connected between the terminal block 300 and the stress cone assembly 200. The stop sleeve 700 is used to restrict the stress cone assembly 200 from sliding freely.

[0041] Specifically, part of the structure of the stop sleeve 700 is located directly below the terminal 300, and part of the structure of the stop sleeve 700 is located directly above the stress cone assembly 200. The stop sleeve 700 can be made of an elastic insulating material (such as silicone rubber). By attaching its upper and lower ends to the terminal 300 and the stress cone assembly 200 respectively, it forms a bidirectional limiting mechanism. This prevents displacement of the stress cone 210 due to vibration during cable 10 operation, while also not affecting the pull-out operation during maintenance, thus balancing stability and convenience.

[0042] It should be noted that the bottom end of the stress cone assembly 200 is also connected to the tail tube 500. The top of the tail tube 500 is sealed to the bottom of the sleeve 100. The tail tube 500 is also connected to the grounding fitting 600. When the stress cone assembly 200 is pulled out from the bottom end of the sleeve 100, the tail tube 500 also separates from the sleeve 100 along with the stress cone assembly 200.

[0043] Combination Figure 5 and Figure 6 It should be noted that the aforementioned power cable terminal for GIS equipment or transformers can be used to connect to transformer 20. Specifically, the conductive component 400 can be inserted into interface 21 of transformer 20 to electrically connect cable 10 to transformer 20. In addition to transformer 20, the power cable terminal for GIS equipment or transformers can also be adapted to GIS equipment (gas-insulated switchgear).

[0044] Example 2 Combination Figure 3 and Figure 4 The difference between Embodiment 2 and Embodiment 1 lies in the assembly relationship between the conductive component 400 and the sleeve 100. In Embodiment 2, the conductive sleeve 410 is replaced by a conductive connector 440, which does not extend into the conductive sleeve 410. The conductive connector 440 and the sleeve 100 are fixed by bolts.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "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.

[0046] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A power cable terminal for GIS equipment or transformers, characterized in that, include: casing; A stress cone assembly is disposed within the sleeve, and the stress cone assembly is operably withdrawable from the bottom end of the sleeve; A terminal block is disposed inside the sleeve and located above the stress cone assembly. The terminal block is used to connect to a cable passing through the stress cone assembly. The terminal block can be pulled out along with the cable when the cable is pulled downward from the sleeve. A conductive component is disposed on the top of the sleeve, and the conductive component is detachably conductively engaged with the terminal. The power cable terminal for GIS equipment or transformers also includes a stop sleeve, which is disposed inside the sleeve and connected between the terminal and the stress cone assembly; part of the stop sleeve is located directly below the terminal and part of the stop sleeve is located directly above the stress cone assembly.

2. The power cable terminal for GIS equipment or transformer according to claim 1, characterized in that, The conductive component is interference-fitted with the sleeve.

3. The power cable terminal for GIS equipment or transformer according to claim 1, characterized in that, The terminal block is inserted into the bottom of the conductive component.

4. The power cable terminal for GIS equipment or transformer according to claim 1, characterized in that, The bottom end of the conductive component is provided with a socket, and the terminal can be pulled out and inserted into the socket.

5. The power cable terminal for GIS equipment or transformer according to claim 1, characterized in that, The conductive component includes a conductive sleeve and an extension rod connected to the top of the conductive sleeve. The conductive sleeve passes through the top of the sleeve and the extension rod protrudes outside the sleeve. The conductive sleeve and the terminal are detachably electrically engaged.

6. The power cable terminal for GIS equipment or transformer according to claim 5, characterized in that, The conductive component also includes a shielding cover fitted on the side of the extension rod.

7. The power cable terminal for GIS equipment or transformer according to claim 1, characterized in that, The stress cone assembly is interference-fitted with the sleeve.

8. The power cable terminal for GIS equipment or transformer according to claim 1, characterized in that, The stress cone assembly includes a stress cone disposed within the sleeve and a cone support for supporting the stress cone.

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