Handle type stress cone and separable connector for power cable

Abstract

The utility model relates to a handle type stress cone for a power cable, which comprises an insulating part which is designed to be approximately in a hollow cylinder shape and is provided with a tail end and a head end opposite to the tail end along the longitudinal axis direction, wherein the insulating part and the semi-conductive part are designed to be elastically recovered so as to allow the stress cone to cover the periphery of the power cable in a radially stretched state; the semi-conductive part is designed to be roughly in a hollow barrel shape and is provided with a joint end and a far end opposite to the joint end in the longitudinal axis direction, and the joint end is designed to be combined with the head end of the insulating part; and the handle extends from the semi-conductive part to the far end, and is configured to allow the handle to be held to pull the handle type stress cone to move along the longitudinal direction of the power cable in a radially stretched state, and the handle part is cut off after the handle type stress cone is moved in position. The utility model also relates to a separable connector with the same.

Description

Technical Field

[0001] The utility model relates to the technical field of electric stress control in power cables, and particularly relates to a power cable stress cone with a handle. Background Technique

[0002] Medium and low voltage power cables are widely used in national industry and daily life. A medium and low voltage power cable generally includes a conductor core, an insulating layer wrapped around the conductor core, a shielding layer wrapped around the insulating layer, and an outer sheath wrapped around the shielding layer. Therefore, when connecting power cables, it is necessary to first remove a section of the outer sheath of the power cable to expose a section of the shielding layer, then remove a part of the exposed shielding layer to expose a section of the insulating layer, and finally remove a part of the exposed insulating layer to expose a section of the conductor core.

[0003] Since electric field concentration will occur at the area where the shielding layer of the power cable is cut off after the shielding layer is removed, in order to reduce the surface electric field at this area, in the prior art, there are mainly the following two types of power cable adapters to eliminate it:

[0004] The first type of power cable adapter includes an insulating part, a layer of stress control putty and a stress control tube arranged inside the insulating part. When the power cable adapter is installed on the processed (stripped) end of the power cable, the stress control putty and the stress control tube cover the semi-conductive shielding layer and the insulating layer of the stripped power cable. In this way, through the double-layer stress control material, local concentrated discharge at the stripped end of the power cable is prevented.

[0005] The second type of power cable adapter includes a commonly used geometric stress control cone. When the power cable adapter is installed on the processed (stripped) end of the power cable, silicone oil or silicone grease is often used as a lubricant to reduce the frictional resistance when installing the stress cone on the cable.

[0006] For the first type of power cable adapter product mentioned above, there will be a heating problem when using the stress cone control material. In large loads and long-term operation, there is a risk of reducing the insulation performance due to excessive temperature.

[0007] For the second type of power cable adapter product mentioned above, in order to ensure the insulation performance, a certain interference fit amount needs to be maintained between the inner diameter of the stress cone and the outer diameter of the cable insulation. When the interference fit amount is large, it will lead to large frictional resistance during installation and difficult installation.

[0008] Meanwhile, for the second type of power cable adapter products, when installing the stress cone, the installer holds the stress cone by hand and pushes it into the cable with one hand. At this time, the gripping force of the installer holding the stress cone by hand will also be transmitted to the interface to increase the frictional resistance, making it difficult to quickly sleeved the stress cone to the desired position of the power cable. Meanwhile, during the installation process, usually due to the large resistance, the operation is quite difficult, especially for stress cones with relatively high voltage levels and when the temperature is relatively low.

[0009] Therefore, there is a technical need in the related art to improve the existing stress cones to reduce the installation difficulty of the stress cone at an acceptable low cost without changing the original cable accessory design and product performance. Summary of the Utility Model

[0010] Therefore, the task of the present utility model is to provide a stress cone to overcome the above-mentioned disadvantages of the prior art.

[0011] According to one aspect of the present utility model, there is provided a pull-type stress cone for a power cable, wherein the power cable includes a conductor core, an insulating layer wrapped around the conductor core, a semi-conductive shielding layer wrapped around the insulating layer, a metal shielding layer wrapped around the semi-conductive shielding layer, and an outer protective layer wrapped around the metal shielding layer. Among them, the pull-type stress cone includes: an insulating part designed to be generally hollow cylindrical, having a tail end and a head end opposite to the tail end along the longitudinal axis direction, wherein the insulating part is designed to be elastically recoverable to allow the insulating part to be covered on the outer periphery of the power cable in a radially stretched state; a semi-conductive part designed to be generally hollow cylindrical, having a joining end and a distal end opposite to the joining end along the longitudinal axis direction, wherein the joining end is designed to be combined with the head end of the insulating part, and the semi-conductive part is designed to be elastically recoverable to allow the semi-conductive part to be covered on the outer periphery of the power cable in a radially stretched state; a pull handle extending from the semi-conductive part towards the distal end, and its structure is designed to be held to pull the pull-type stress cone to move along the longitudinal direction of the power cable in a radially stretched state and cut off the pull handle part after moving into place.

[0012] Different from the stress cones in the prior art, in the present utility model, the above problem is solved by adding a pull handle for the operator to avoid holding the semi-conductive part in the semi-conductive part. During the operation and installation of the pull-type stress cone according to the present utility model, the force application point of the operator is the pull handle located in front of the pull-type stress cone. Since the pull-type stress cone does not experience a gripping force at this time, the dynamic frictional force between it and the power cable is relatively small, so that the pull-type stress cone can be pulled to the position where electric field homogenization is required in a very labor-saving manner. And after use, the operator can cut off the pull handle without affecting the use effect of the stress cone.

[0013] As a preferred aspect of the present utility model, the handle and the semi-conductive part are integrally formed by injection molding.

[0014] As a preferred aspect of the present utility model, the handle extends from the body of the semi-conductive part by a distance of not less than 5 cm.

[0015] As a preferred aspect of the present utility model, the head end of the insulating part is generally chamfered to form an acute angle of 10 - 35 degrees to avoid electric field concentration in high electric field regions.

[0016] As a preferred aspect of the present utility model, the joint end of the semi-conductive part is generally chamfered to form an acute angle of 10 - 35 degrees to avoid electric field concentration in high electric field regions.

[0017] As a preferred aspect of the present utility model, the insulating part and the semi-conductive part are integrally formed by injection molding.

[0018] As a preferred aspect of the present utility model, both the insulating part and the semi-conductive part are made of ethylene propylene diene monomer (EPDM) rubber or silicone rubber.

[0019] As a preferred aspect of the present utility model, the handle is made of ethylene propylene diene monomer (EPDM) rubber or silicone rubber.

[0020] As a preferred aspect of the present utility model, the handle is designed as a pair of lugs extending from the body of the semi-conductive part, and a hollow part is formed between the paired lugs.

[0021] As another aspect of the present utility model, it also relates to a separable connector for connecting a power cable to a switchgear. The separable connector is characterized in that it includes: a connector body having a communicating transverse installation cavity and a longitudinal installation cavity; a crimping terminal inserted into the connector body from the longitudinal installation cavity until it abuts against the inner wall of the transverse installation cavity. The crimping terminal is provided with a laterally extending connection hole at the end adjacent to the transverse installation cavity, and the end of the crimping terminal away from the transverse installation cavity is connected to the power cable; a conductive connecting member located in the transverse installation cavity and passing through the connection hole to connect to the connection hole. The sections of the conductive connecting member on both sides of the connection hole are respectively a first connection section and a second connection section slidably and conductively connected to the switchgear; an insulating member inserted into the connector body from the opening of the transverse installation cavity adjacent to the first connection section and connected to the first connection section; wherein the end of the power cable is provided with a stress cone, and the stress cone is the above-mentioned handle-type stress cone for power cables, and the handle part has been cut off.

[0022] Some of the other features and advantages of the present utility model will be apparent to those skilled in the art after reading this application, and the other part will be described in conjunction with the accompanying drawings in the following detailed description. Description of the Drawings

[0023] Hereinafter, embodiments of the present utility model will be described in detail with reference to the accompanying drawings, wherein:

[0024] Figure 1 is a perspective view of an embodiment of a stress cone according to the present utility model;

[0025] Figure 2 is Figure 1 the rear view of the stress cone in

[0026] Figure 3 is Figure 1 the side view of the stress cone in

[0027] Figure 4 is a perspective view of the semiconductive part of the stress cone according to the present utility model;

[0028] Figure 5 is Figure 4 the side view of the semiconductive part in

[0029] Figure 6 is a perspective view of the insulating part of the stress cone according to the present utility model;

[0030] Figure 7 is Figure 6 the side view of the insulating part in

[0031] Figure 8 is a cross-section of the power cable connected to the stress cone of the present utility model Figure 2

[0032] Figure 9 is a cross-sectional view of the separable connector to which the stress cone of the present utility model is applied.

[0033] Description of the Reference Numerals:

[0034] 10, power cable; 11, conductor core; 12, insulating layer; 13, semiconductive shielding layer;

[0035] 14, metallic shielding layer; 15, outer protective layer;

[0036] 100, stress cone; 101, insulating part; 101A, tail end; 101B, head end;

[0037] 102, semiconductive part; 102A, joint end; 103, handle; 104, demarcation part;

[0038] L, longitudinal axis; 110, connector body; 111, transverse mounting cavity;

[0039] 112, longitudinal mounting cavity; 120, crimp terminal; 121, connection hole;

[0040] 130, conductive connecting member; 131, first connecting section; 132, second connecting section;

[0041] 133, engaging member; 140, insulating component; 141 - insulating plug; 142 - rear cover; Detailed implementation mode

[0042] Referring now to the drawings, a schematic solution of the stress cone disclosed by the present utility model will be described in detail. Although the drawings are provided to present some embodiments of the present utility model, the drawings do not have to be drawn according to the dimensions of specific implementation schemes, and some features may be enlarged, removed or sectioned locally to better show and explain the disclosure of the present utility model. Some components in the drawings can be adjusted in position according to actual needs without affecting the technical effects. Phrases such as "in the drawings" or similar terms appearing in the specification do not have to refer to all the drawings or examples.

[0043] Certain directional terms used hereinafter to describe the drawings, such as "front", "rear", "inner", "outer", "above", "below" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when normally viewing the drawings. Unless otherwise specified, the directional terms described in this specification are basically in the conventional directions understood by those skilled in the art.

[0044] The terms "first", "the first", "second", "the second" and their similar terms used in the present utility model do not represent any order, quantity or importance in the present utility model, but are used to distinguish one component from other components.

[0045] To further understand the purpose, structure, features and functions of the present utility model, it will be described in detail below in conjunction with embodiments.

[0046] A pull - handle type stress cone 100 for a power cable 10 is proposed in the present utility model. The power cable 10 includes a conductor core, an insulating layer wrapped around the conductor core, a semi - conductive shielding layer wrapped around the insulating layer, a metal shielding layer wrapped around the semi - conductive shielding layer, and an outer protective layer wrapped around the metal shielding layer. The pull - handle type stress cone includes: an insulating portion designed to be generally hollow cylindrical, having a tail end and a head end opposite to the tail end along the longitudinal axis. The insulating portion is designed to be elastically recoverable to allow the insulating portion to be covered over the outer circumference of the power cable in a radially stretched state; a semi - conductive portion designed to be generally hollow cylindrical, having a joining end and a distal end opposite to the joining end along the longitudinal axis. The joining end is designed to be combined with the head end of the insulating portion. The semi - conductive portion is designed to be elastically recoverable to allow the semi - conductive portion to be covered over the outer circumference of the power cable in a radially stretched state; a pull - handle extending from the semi - conductive portion towards the distal end, configured to be held to pull the pull - handle type stress cone to move along the longitudinal direction of the power cable in a radially stretched state, and the pull - handle portion is cut off after being moved into place.

[0047] Specifically, first, please refer to Figure 8 of the present utility model, which shows a power cable 10 for transmitting electric power. Here, as a non - limiting example, a power cable 10 with a rated voltage of 48 / 66(72.5) kV is shown in the appendix Figure 8 . It generally includes a conductor core 11 made of a good electrical conductor, an insulating layer 12 wrapped around the conductor core 11, a semi - conductive shielding layer 13 wrapped around the insulating layer 12, a metal shielding layer 14 wrapped around the semi - conductive shielding layer 13, and an outer protective layer 15 wrapped around the metal shielding layer 14.

[0048] Therefore, when splicing the power cable 10, a section of the outer protective layer 15 of the power cable 10 must be removed first to expose a section of the metal shielding layer 14, then a part of the exposed metal shielding layer 14 is removed to expose a section of the semi - conductive shielding layer 13, then a part of the exposed semi - conductive shielding layer 13 is removed to expose a section of the insulating layer 12, and finally a part of the exposed insulating layer 12 is removed to expose a section of the conductor core 11. In this way, the end of the power cable 10 to be spliced is processed. It is known that the end face of the peeled semi - conductive shielding layer 13 of the power cable 10 can be processed (for example, by grinding) into an inclined surface inclined to the outer surface of the peeled insulating layer 12, so that the thickness at the end face of the semi - conductive shielding layer 13 gradually changes to zero towards the peeled insulating layer 12. In this way, it is possible to further prevent local concentrated discharge at the end face of the semi - conductive shielding layer 13 and further homogenize the electric field at the peeled end of the power cable 10.

[0049] In order to further homogenize the electric field at the stripped end of the power cable 10, the pull - type stress cone 100 according to the present utility model can be used. As Figures 1-3 shown, here the pull - type stress cone 100 has an insulating portion 101 designed as a generally hollow cylindrical shape on the right - most side in Figure 1 . It has an inner hole with a size generally equivalent to the outer diameter of the power cable 10, so that the insulating portion 101 can be operated by an operator during use, for example, to move along the length direction of the power cable 10 until it is moved to the position where electric field homogenization is required. The stress cone insulating portion covers the cable insulation surface, and the stress cone semi - conductive portion covers the cable insulation shield surface. Here, for example, it can be the conductor core 11 exposed outside in the power cable 10 and the exposed insulating layer 12 near it. It should be noted that the inner diameter of the axially hollow structure of the insulating portion 101 needs to be adjusted according to the outer diameter of the cable shield layer during specific use. It is required that its inner diameter is smaller than the insulation outer diameter of the cable, and the insulating portion 101 is designed to be elastically recoverable, so as to provide a certain pressing force when covering the outer circumference of the power cable 10 in a radially stretched state as described below to ensure a reasonable and effective crimping between the insulating portion 101 of the stress cone 100 and the outer layer of the power cable 10. That is, an interference fit is designed between the insulating portion 101 of the stress cone 100 and the power cable 10.

[0050] In Figures 6-7 , the structure of the insulating portion 101 is better shown. As shown in the figure, the insulating portion 101 has a tail end 101A in the left side of Figures 6-7 and a head end 101B opposite to the tail end 101 along the longitudinal axis direction. As will be described in detail below, the head end 101B will be used to combine with the semi - conductive portion 102 shown on the left side in Figure 1 and thus form a single piece. For this purpose, here the head end 101B of the insulating portion 101 is formed into an acute - angle design that can avoid electric field concentration in the high - electric - field region. Here, the head end 101B is generally chamfered to an acute angle of 10 - 35 degrees, for example. Of course, those skilled in the art can understand that it is related to the specifications of the stress cone 100. Here, this angle design is only exemplary, and the angle of the appropriate chamfer design can be determined according to the specifications of the stress cone 100.

[0051] In a specific embodiment, here, the insulating portion 101 of the pull - type stress cone 100 is designed to be elastically recoverable, so as to allow the insulating portion 101 of the pull - type stress cone 100 to be supported on the outer circumference of the power cable 10 in a radially expanded or pre - stretched state. The terms "elastically recoverable", "elastically contractible", and "cold - shrinkable" can be used interchangeably to indicate that the article is shrinkable at a temperature of approximately - 20°C to approximately 50°C without additional heating.

[0052] It should be emphasized that both the material of the insulating portion 101 of the handle - type stress cone 100 and the semiconductive portion 102 to be described in detail below have a certain elasticity, which is sufficient to allow their radial expansion and relaxation to be placed on the power cable 10. In one embodiment, the material of the handle - type stress cone 100 is ethylene propylene diene monomer (EPDM) rubber or silicone rubber.

[0053] In Figure 4 FIG. shows the semiconductive portion 102 of the handle - type stress cone 100, where the semiconductive portion 102 is also designed to be generally hollow cylindrical and has an inner hole with a size generally equivalent to the outer diameter of the power cable 10, so that the semiconductive portion 102 and the insulating portion 101 can be operated by an operator, for example, during use, to move along the length direction of the power cable 10 until they are moved to the position where electric field homogenization is required. It should be noted that the inner diameter of the axially hollow structure of the semiconductive portion 102 can also be adjusted according to the outer diameter of the cable during specific use, and it is required that its inner diameter be smaller than the insulating outer diameter of the cable, and the semiconductive portion 102 is designed to be elastically recoverable to provide a certain pressing force when covering the outer circumference of the power cable 10 in a radially stretched state as described below to ensure a reasonable and effective crimping between the semiconductive portion 102 and the outer layer of the power cable 10. That is, an interference fit is designed between the semiconductive portion 102 and the power cable 10.

[0054] As Figure 4 shown, the semiconductive portion 102 has a joint end 102A on the left side in Figure 4 and a distal end opposite to the joint end 102A along the longitudinal axis direction. As will be described in detail below, the distal end can be designed as a handle 103 that allows a pulling force to be applied to the already joined semiconductive portion 102 and insulating portion 101 to move them along the length direction of the power cable 10 until they are moved to the position where electric field homogenization is required. Here, the handle 103 is designed as a pair of lugs extending from the body of the semiconductive portion 102, where the lugs extend from the body of the semiconductive portion 102 by a length of not less than 5 cm, and a concave portion is formed between the paired lugs to facilitate the operator's thumb to easily reach in. As Figure 4 shown, in order to combine the tail end 101B of the insulating portion 101 with the joint end 102A of the semiconductive portion 102, the joint end 102A of the semiconductive portion 102 is designed with an acute - angle design that can avoid electric field concentration in the high - electric - field region. Here, the joint end 102AB is generally chamfered to form an acute angle of 10 - 35 degrees, for example.

[0055] As Figures 4-5As shown in [figure], the handle 103 is preferably integrally formed with the semiconductive part 102 here, that is, both are integrally injection molded by the same silicone resin material, which helps to reduce the manufacturing difficulty and cost. As will be described in detail below, since the handle 103 will be removed after the handle-type stress cone 100 is positioned on the outer periphery of the power cable 10, a demarcation part 104 is provided between the body of the semiconductive part 102 and the handle 103. The demarcation part 104 can be, for example, a concave part with a certain depression to facilitate separating the body of the semiconductive part 102 from the handle 103 with tools later.

[0056] To form the semiconductive part 101 and the insulating part 102 of the handle-type stress cone 100 respectively, the silicone resin compositions for each part are mixed and vulcanized at high temperature. The semiconductive part 102 and the insulating part 101 can be formed by any applicable technique, such as extrusion or molding. In one embodiment, the semiconductive part 102 and the insulating part 101 are formed by injection molding.

[0057] Preferably, when the semiconductive part 102 is injection molded here, conductive carbon black is added or doped into it, so that the cylindrical structure made of it presents a black visual effect. In contrast, no colorant is added or doped when the insulating part 101 is injection molded, so a visual effect of a light color can be formed compared with the black semiconductive part 102. This difference in visual effect helps the operator to accurately know each part and composition of the handle-type stress cone 100 to prevent unnecessary misoperations. Of course, some colorants, such as gray and red, can also be added when the insulating part 101 is injection molded, which can also achieve the effect of providing visual cues to the operator.

[0058] Next, the operation process of the handle-type stress cone 100 according to the present invention will be described.

[0059] First, the handle-type stress cone 100 according to the present invention is sleeved on the outer periphery of the power cable 10 that needs to be subjected to electric field homogenization. As described above, since the inner diameters of the axially hollow structures of the semiconductive part 102 and the insulating part 101 are designed to be smaller than the outer diameter of the insulation of the cable to provide a certain pressing force later to ensure a reasonable and effective crimping between the stress cone 100 and the outer layer of the power cable 10, here, an interference fit is designed between the handle-type stress cone 100 and the power cable 10. That is, at this time, the semiconductive part 101 and the insulating part 102 of the handle-type stress cone 100 are elastically expanded and cover the outer periphery of the power cable 10 in a radially stretched state.

[0060] Subsequently, in order to enable the handle-type stress cone 100 to move along the length direction of the power cable 10 until it is moved to the part where electric field homogenization is required. Due to the interference fit between the handle-type stress cone 100 and the power cable 10, a force along the length direction or the longitudinal direction of the power cable 10 needs to be applied to the handle-type stress cone 100 to overcome the frictional force between it and the power cable 10.

[0061] Different from the conventional stress cone design without a handle 103, in the handle-type stress cone 100 according to the present invention, a handle 103 is provided at one end of the semiconductive part 102 as the force application point for the operator, without the need for the operator to hold the outer periphery of the insulating part 101 to apply force to it. This is because the method of applying force by holding the outer periphery of the insulating part 101 is based on applying a radial holding force or pressure to the stress cone. Such a force application method will significantly increase the interface pressure of the contact surface between the handle-type stress cone 100 and the power cable 10, thereby increasing the frictional resistance and making the installation of the stress cone very difficult.

[0062] It is clear that during the operation and installation of the handle-type stress cone 100 according to the present invention, the force application point of the operator is the handle 103 located in front of the handle-type stress cone 100. Due to the design of the paired lugs of the handle 103, it allows the operator to hold the handle 103 with both hands and insert the thumbs into the recess between the handle 103 and the power cable 10, which allows the pulling force to be applied to the handle-type stress cone 100 in a comfortable and ergonomic manner. Since the handle-type stress cone 100 is not subjected to a holding force at this time, the dynamic frictional force between it and the power cable 10 is small. It is believed that due to the pulling force of the handle 103, the frictional force between the handle-type stress cone 100 and the power cable 10 can be further reduced, so that the handle-type stress cone 100 can be pulled to the part where electric field homogenization is required in a very labor-saving manner.

[0063] As Figure 8 As shown in, after the handle-type stress cone 100 is pulled into place, it is in such a position that the semiconductive part 102 of the handle-type stress cone 100 is positioned to extend across the end face of the stripped semiconductive shielding layer 13 of the power cable 10 and is configured to cover and engage the exposed part of the power cable 10. At the same time, the insulating part 101 made of a material with a dielectric constant much larger than that of the main insulation closely covers the shielding break of the power cable 10 in a cylindrical structure. As a result, relying on the refraction phenomenon of the power lines at the interface with different dielectric constants, the purpose of reducing the electric field intensity and homogenizing the electric field is achieved.

[0064] After the pull - type stress cone 100 is pulled into place, the operator uses a tool to cut or separate along the demarcation part 104 between the body of the semiconductive part 102 and the pull handle 103. Subsequently, only the semiconductive part 102 and the slightly outward - expanding insulating part 101 are left to equalize the electric field of the exposed part of the power cable.

[0065] As shown in Figure 9 a separable connector is shown for plugging in a power cable 10 (as shown in Figure 8 ) with a pull - type stress cone 100 crimped thereon (at this time the pull handle 103 has been cut off). This separable connector can then connect the power cable 10 with a homogenized electric field to the switchgear as needed, which is convenient to operate and has high reliability. As shown in Figure 9 , the separable connector may include a connector body 110, a crimp terminal 120, a conductive connecting piece 130, and an insulating part 140.

[0066] Specifically, the connector body 110 may include a transverse installation cavity 111 and a longitudinal installation cavity 112 that communicates with the approximate middle of the transverse installation cavity 111 to form a T - shape. The crimp terminal 120 can be inserted into the connector body 110 from the opening of the longitudinal installation cavity 112 until it abuts against the inner wall of the transverse installation cavity 111 and cannot move further. The crimp terminal 120 located at the end of the transverse installation cavity 111 may be provided with a laterally penetrating connection hole 121, so that the conductive connecting piece 130 can be inserted into the connection hole 121 in a lateral orientation and connected to the connection hole 121 subsequently. Exemplarily, the inner wall of the connection hole 121 may be provided with a first thread, and the outer periphery of the conductive connecting piece 130 may be provided with a first mating thread adapted to the first thread, thereby realizing a firm connection between the crimp terminal 120 and the conductive connecting piece 130. In addition, the end of the crimp terminal 120 adjacent to the opening of the longitudinal installation cavity 112 can be used to connect a power cable 10 with a pull - type stress cone 100 crimped thereon (at this time the pull handle 103 has been cut off), thereby forming a conductive path between the crimp terminal 120 and the power cable 10.

[0067] The sections of the conductive connecting piece 130 on both sides of the connection hole 121 can be respectively a first connection section 131 connected to the insulating part 15 and a second connection section 132 slidably and conductively connected to the switchgear. Preferably, the part of the transverse installation cavity 111 on the same side as the second connection section 132 can accommodate a bushing installed on the switchgear, and the bushing can be slidably and conductively connected to the second connection section 132 such as finger connection. Thereby, the convenience of installing the separable connector to the switchgear is greatly improved, and the long - term reliability of the slidable conductive connection is also improved compared with the threaded connection. In this way, a wire path is formed between the switchgear and the cable via the conductive connecting piece 130 and the crimp terminal 120.

[0068] The first connection section 131 of the conductive connection member 130 can be connected to an insulating member 140 inserted from an opening adjacent to the first connection section 131 of the transverse installation cavity 111. Exemplarily, a second thread can be provided on the insulating member 140, and a second mating thread adapted to the second thread can be provided on the first connection section 131, thereby realizing a fastening connection between the conductive connection member 130 and the insulating member 140, and further ensuring the insulation effect of the separable connector 10 through the connection between the conductive connection member 130 and the insulating member 140. In practical applications, the first thread and the second thread can be configured to be the same or different as needed.

[0069] Optionally, a joining member 133 such as a nut extending radially outward can be provided adjacent to the first mating thread of the first connection section 131 of the conductive connection member 130 to facilitate engaging an external torque wrench to screw the conductive connection member 130 onto the crimp terminal 120. In addition, the insulating member 140 can include an insulating plug threadedly connected to the first connection section 131 and a rear cover covering the end side of the insulating plug away from the first connection section 131. A blind hole can be provided at an end of the insulating plug adjacent to the first connection section 131, a second mating thread can be provided on the inner wall of the blind hole, and an interface for engaging an external torque wrench can be provided at an end of the insulating plug away from the first connection section 131 to screw the insulating plug onto the first connection section 131, and the insulating plug can thus cover the first connection section 131 of the conductive connection member 13. The rear cover can be a rubber cap covering the insulating plug, thereby further improving the insulation effect of the separable connector.

[0070] Compared with the prior art, the separable connector realizes the conductive path between the switchgear and the cable by an operator inserting a power cable 10 terminal crimped with a pull - type stress cone 100 (at this time the pull handle 103 has been cut off) and a conductive connecting rod connected to the terminal, with a simple structure and reliable connection. Due to the design of the pull - type stress cone 100, the operator can easily solve the problem of electric field concentration at the end of the shielding layer of the power cable 10 to be inserted into the separable connector.

[0071] It should be understood that although this specification is described according to each embodiment, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments understandable to those skilled in the art.

Claims

1. A handle-type stress cone for a power cable, wherein the power cable comprises a conductor core, an insulating layer wrapped on the conductor core, a semi-conductive shielding layer wrapped on the insulating layer, a metal shielding layer wrapped on the semi-conductive shielding layer, and an outer protective layer wrapped on the metal shielding layer, wherein: The handle type stress cone comprises: An insulating portion designed to be substantially hollow and cylindrical, having a tail end and a head end opposite to the tail end along the longitudinal axis, wherein the insulating portion is designed to be elastically recoverable so as to allow the insulating portion to be covered to the outer circumference of the power cable in a radially stretched state; A semiconductive part designed to be substantially hollow cylindrical, having a joint end and a distal end opposite to the joint end along the longitudinal axis, wherein the joint end is designed to be combined with the head end of the insulating part, wherein the semiconductive part is designed to be elastically recoverable to allow the semiconductive part to be covered to the outer circumference of the power cable in a radially stretched state; A handle extends from the semiconductive portion toward the distal end and is configured to be held to pull the handle-type stress cone to move along the longitudinal direction of the power cable in a radially stretched state and the handle portion is sheared off after being moved into position.

2. The handle-type stress cone for power cable according to claim 1, characterized in that: The handle and the semiconductive part are both an integral part formed by injection molding.

3. The handle-type stress cone for power cable according to claim 1, characterized in that: The handle extends from the body of the semiconductive portion by a distance of not less than 5 cm.

4. The handle-type stress cone for power cable according to claim 1, characterized in that: The head end of the insulating portion is generally chamfered to an acute angle of 10-35 degrees to avoid electric field concentration in a high electric field area.

5. The handle-type stress cone for power cable according to claim 4, characterized in that: The junction end of the semiconductive portion is chamfered to a sharp angle of 10-35 degrees to avoid electric field concentration in a high electric field region.

6. The handle-type stress cone for power cable according to claim 1, characterized in that: The insulating part and the semiconductive part are both injection molded to form an integral piece.

7. The handle-type stress cone for power cable according to claim 1, characterized in that: The insulating part and the semi-conductive part are both made of EPDM rubber or silicone rubber.

8. The handle-type stress cone for power cable according to claim 7, characterized in that: The handle is made of EPDM rubber or silicone rubber.

9. The handle-type stress cone for power cable according to claim 1, characterized in that The handle is designed as a pair of lugs extending from the body of the semiconductive part, wherein a concave portion is formed between the pair of lugs.

10. A separable connector for connecting a power cable to a switchgear, characterized in that: The detachable connector comprises: A connector body having a communicating transverse mounting cavity and a longitudinal mounting cavity; A crimping terminal, which is inserted into the connector body from the longitudinal mounting cavity until it abuts against the inner wall of the transverse mounting cavity, the end of the crimping terminal adjacent to the transverse mounting cavity is provided with a transversely extending connecting hole, and the end of the crimping terminal away from the transverse mounting cavity is connected to the power cable; A conductive connector, which is located in the transverse mounting cavity and passes through the connecting hole and is connected to the connecting hole, wherein the sections of the conductive connector located on both sides of the connecting hole are respectively a first connecting section and a second connecting section which is slidably conductively connected to the switch device; An insulating component, which is inserted into the connector body from an opening of the transverse mounting cavity adjacent to the first connecting section and connected to the first connecting section; The end of the power cable is provided with a stress cone, wherein the stress cone is a handle-type stress cone for a power cable according to any one of claims 1 to 9, wherein the handle portion has been cut off.

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