JP2017169262A - Terminal connector of aluminum conductor cable - Google Patents

Abstract

An object of the present invention is to provide a compact and highly reliable terminal connecting portion of an aluminum conductor cable which can firmly connect an aluminum conductor and a conductor connecting member with a simple construction work. A terminal connection portion of an aluminum conductor cable includes an aluminum conductor cable and a conductor connection member attached to a distal end portion of the aluminum conductor. The conductor connection member has an outer first layer made of aluminum and an inner second layer made of copper formed integrally with the first layer. The second layer has an insertion hole into which the aluminum conductor is inserted, and has a serration on a contact surface that contacts the aluminum conductor. [Selection diagram] FIG.

Description

  The present invention relates to a terminal connecting portion of an aluminum conductor cable.

  In general, in a terminal connection portion of a power cable, an internal conductor (conductor lead bar) and a cable conductor are electrically connected via a conductor connection terminal. Moreover, in the intermediate connection part of an electric power cable, cable conductors are electrically connected via a conductor connection pipe (sleeve). When the cable conductor is copper, the cable conductor and the conductor connection member (conductor connection terminal, conductor connection tube) can be easily connected by, for example, compression, and a good electrical connection is ensured.

  In recent years, power cables having aluminum conductors that are cheaper and lighter than copper conductors have been put into practical use (hereinafter referred to as “aluminum conductor cables”). Aluminum has a property that an oxide film is easily formed on the surface thereof as compared with copper. When the oxide film is interposed between the aluminum conductor and the conductor connecting member, the contact resistance increases, and therefore, in the cable terminal connecting portion such as the terminal connecting portion or the intermediate connecting portion, the conduction between the aluminum conductor and the conductor connecting member is ensured. Measures are needed.

  For example, in Patent Document 1, conduction is ensured by compressing and connecting an aluminum conductor and a conductor connecting member (sleeve) and tightening a bolt. Further, Patent Document 1 discloses a conductive antioxidant layer (compound layer) between an aluminum conductor and a conductor connecting member in order to prevent an oxide film from being formed over time on the surface of the aluminum conductor. It may be possible to intervene. In Patent Document 1, the conductor connecting member (sleeve) is made of aluminum or copper.

  In addition, in a crimp terminal for a small-diameter covered electric wire having an aluminum conductor, one having a concave and convex engaging portion called serration is proposed on the inner surface of a wire barrel portion that holds a core wire portion (aluminum conductor). (For example, patent document 2). Since the edge of the serration bites into the core wire, the oxide film formed on the surface of the core wire is destroyed, so that good conduction can be easily obtained. Further, since the contact area between the core wire and the crimp terminal is increased, the crimp strength is improved. Also in the terminal connection part of the power cable having an aluminum conductor, it is considered that the mechanical strength is improved by providing serrations on the inner surface of the conductor connection member.

JP 2014-167848 A JP 2014-164886 A

  However, when a conductor connection member with serrations made of aluminum is applied to an aluminum conductor cable, the serration may be crushed and the desired mechanical strength may not be obtained when the conductor connection member and the aluminum conductor are compression-connected. . In order to ensure the desired mechanical strength, the compression length may be increased, but the total length of the terminal connection portion is longer than the terminal connection portion of the copper conductor cable (power cable having a copper conductor). Compactness is required.

  On the other hand, when a conductor connection member with serrations made of copper is applied to an aluminum conductor cable, a desired mechanical strength can be obtained at the manufacturing stage. However, since the linear expansion coefficients of aluminum and copper are greatly different, the difference in the amount of expansion / contraction due to heat increases, and a complex serration structure is required to minimize this effect. If the serration structure becomes complicated, the processing cost becomes expensive and the design study becomes complicated. For this reason, it has not been practical for those skilled in the art to apply a serrated conductor connecting member made of copper to an aluminum conductor cable.

  An object of the present invention is to provide a compact and highly reliable terminal connection portion of an aluminum conductor cable capable of firmly connecting an aluminum conductor and a conductor connecting member with a simple construction work.

The terminal connection part of the aluminum conductor cable according to the present invention includes an aluminum conductor cable, a cable insulator, a cable outer semiconductive layer, an aluminum conductor cable having a stepped end so as to expose the cable shielding layer,
A conductor connecting member attached to the tip of the aluminum conductor,
The conductor connecting member has an outer first layer made of aluminum, and an inner second layer made of copper formed integrally with the first layer;
The second layer has an insertion hole into which the aluminum conductor is inserted, and has serrations on a contact surface in contact with the aluminum conductor.

  Here, “made of aluminum” includes not only a case of being made of pure aluminum but also a case of being made of an aluminum alloy containing aluminum as a main component. Similarly, “made of copper” includes not only pure copper but also a copper alloy containing copper as a main component.

  ADVANTAGE OF THE INVENTION According to this invention, the terminal connection part of the compact and reliable aluminum conductor cable which can connect an aluminum conductor and a conductor connection member firmly by simple construction work is implement | achieved.

It is a fragmentary sectional view which shows the air termination | terminus connection part of the aluminum conductor cable which concerns on 1st Embodiment. It is an enlarged view which shows the connection structure of an aluminum conductor and a conductor connection terminal. It is a fragmentary sectional view which shows the intermediate connection part of the aluminum conductor cable which concerns on 2nd Embodiment. It is an enlarged view which shows the connection structure of an aluminum conductor and a conductor connection pipe.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a partial cross-sectional view showing a terminal connection portion (in FIG. 1, an air terminal connection portion) of an aluminum conductor cable according to an embodiment of the present invention. FIG. 2 is an enlarged view showing a connection structure between the aluminum conductor 111 and the conductor connection terminal 121. As shown in FIGS. 1 and 2, the cable end connection portion 1 includes a cable terminal portion 1A and a polymer sleeve 1B to which the cable terminal portion 1A is attached. Hereinafter, in the drawing, the upper side is referred to as the front end side, and the lower side is referred to as the rear end side.

  As shown in FIG. 1, the polymer sleeve 1 </ b> B includes a rod-shaped inner conductor 13 (conductor lead bar) disposed at the center, an insulating cylinder 14 provided on the outer periphery of the inner conductor 13, and a polymer provided on the outer periphery of the insulating cylinder 14. The cover 15, the shielding metal 16 formed integrally with the insulating cylinder 14, the lower metal 17, and the bottom metal 19 are provided. The inner conductor 13, the insulating cylinder 14, the polymer cover 15, and the shielding metal fitting 16 are integrally formed by, for example, molding.

  The inner conductor 13 is made of a conductive material suitable for energization made of, for example, copper, aluminum, a copper alloy, or an aluminum alloy. The tip 131 of the internal conductor 13 is connected to an overhead wire, a lead-in wire (not shown), or the like. The rear end portion 132 of the inner conductor 13 is electrically connected to the conductor connection terminal 121 (conductor connection member).

  The insulating cylinder 14 is made of a hard plastic resin material (for example, epoxy resin or FRP (Fiber Reinforced Plastics)) having high mechanical strength. The cable terminal portion 1 </ b> A is attached to the receiving port of the rear end portion 141 of the insulating cylinder 14.

  The polymer covering 15 is made of a material having excellent electrical insulation performance (for example, a polymer material such as a silicone polymer). On the outer peripheral surface of the polymer cover 15, umbrella-shaped ridges are formed apart in the longitudinal direction.

  The shielding metal fitting 16 has a cylindrical portion embedded concentrically with the internal conductor 13 and a flange portion extending radially outward from the rear end of the cylindrical portion. The cylindrical portion has an electric field relaxation function and relaxes the electric field of the polymer sleeve 1B.

  The lower metal fitting 17 has a cylindrical shape having a flange portion (hereinafter referred to as “front end flange portion”) at the front end portion, and is disposed around the rear end portion 141 of the insulating cylinder 14. The lower fitting 17 is fixed to the shielding fitting 16 by bolting the front end flange portion of the lower fitting 17 to the rear end surface of the flange portion of the shielding fitting 16 (not shown).

  The bottom metal part 19 is arranged on the outer periphery of the front end flange part of the lower metal part 17 and is bolted (not shown) to the rear end surface of the outer peripheral edge part of the flange part of the shielding metal part 16. The polymer sleeve 1B is fixed to the gantry R via the support lever 18 by fixing the support lever 18 to the rear end surface of the bottom metal fitting 19 with bolts.

  1 A of cable terminal parts have the aluminum conductor cable 11 and the connection component 12 attached to the front-end | tip part of the aluminum conductor cable 11. FIG. The connection component 12 includes a conductor connection terminal 121, a stress cone 122, a compression device (not shown), a protective metal fitting 123, an anticorrosion layer 124, and the like.

  The aluminum conductor cable 11 is a power cable (for example, a CV cable) insulated with rubber or plastic. The aluminum conductor cable 11 includes, in order from the inside, an aluminum conductor 111, an inner semiconductive layer (not shown), a cable insulator 112, an outer semiconductive layer (not shown), a cable shielding layer (not shown), a cable sheath 113, and the like. Have In the cable terminal portion 1 </ b> A, each layer is exposed by stripping a predetermined length from the tip of the aluminum conductor cable 11.

  A conductive conductor connection terminal 121 is connected to the aluminum conductor 111 by compression. A stress cone 122 in which an insulating rubber layer and a bell mouth shaped semiconductive rubber layer are integrally formed is attached to the outer periphery extending from the cable insulator 112 to the distal end side of the cable external semiconductive layer (not shown). A compression device (not shown) and a protective metal fitting 123 are attached to the rear end side of the stress cone 122, and an anticorrosion layer 124 for waterproofing is formed at the rear end portion of the protective metal fitting 123.

  The conductor connection terminal 121 includes a compression part 121a that is connected to the aluminum conductor 111 by compression, a current-carrying part 121b that is electrically connected to the internal conductor 13 via the plug 120, and a space between the compression part 121a and the current-carrying part 121b. An annular recess 121c is provided.

  The recessed portion 121c can absorb the elongation and deformation of the conductor connection terminal 121 when the conductor connection terminal 121 is compression-connected to the aluminum conductor 111, and consequently, the effectiveness of the spring-like contact 125 and the plug 120 in the energization portion 121b. Electrical contact can be achieved. The plug 120 is disposed on the outer periphery of the conductor connection terminal 121 and is electrically connected to the rear end portion 132 of the inner conductor 13 by a conductor contact such as a multi-contact.

  The conductor connection terminal 121 has a groove 121e on the outer peripheral surface of the energization portion 121b. A spring-like contact 125 (multi-contact) is disposed in the groove 121e. The conductor connection terminal 121 has an insertion hole 121f extending in the axial direction. The aluminum conductor 111 is inserted into the insertion hole 121f.

  The conductor connection terminal 121 has a serration 121d at a contact surface in contact with the aluminum conductor 111 in the insertion hole 121f, here, at a portion corresponding to the compression portion 121a. The serration 121d has, for example, a female screw shape. The amount of the antioxidant applied to the inner peripheral surface of the conductor connection terminal 121 can be controlled by the shape of the serration 121d and the depth of the groove. The serration 121d is not limited to the female screw shape, but may be any uneven structure. The female screw shape is more preferable because it is easier to process than the complicated uneven structure and the cost of the conductor connection terminal 121 can be suppressed.

  Further, in the present embodiment, the conductor connection terminal 121 includes an outer first layer L1 made of aluminum (including an aluminum alloy) and copper (including a copper alloy) formed integrally with the first layer L1. And an inner second layer L2. The first layer L1 and the second layer L2 are joined by shrink fitting, for example.

  Specifically, after the cylindrical aluminum material that forms the first layer L1 is expanded by heating, the cylindrical copper material that forms the second layer L2 is inserted and cooled to shrink the aluminum material. By doing so, the base materials are joined together. Thereafter, by cutting, a groove 121e is formed on the outer peripheral surface of the first layer L1 corresponding to the energizing portion 121b, and an insertion hole 121f is formed in the second layer L2. Further, serrations 121d are formed at portions corresponding to the compression portions 121a of the insertion holes 121f.

  The cable terminal portion 1A is attached to the polymer sleeve 1B by a plug-in structure. The aluminum conductor 111 is electrically connected to the inner conductor 13 through the conductor connection terminal 121, the spring-like contact 125, and the plug 120.

  When the conductor connection terminal 121 is connected to the tip of the aluminum conductor 111, the oxide film formed on the surface of the aluminum conductor 111 is removed in advance with a wire brush. Further, a protective film is wound around the end surface of the cable insulator 112 (the boundary surface between the aluminum conductor 111 and the cable insulator 112) to protect the leaked antioxidant from adhering to the cable insulator 112.

  Next, a conductive antioxidant (anticorrosive compound) is applied to the outer peripheral surface of the aluminum conductor 111 and the inner peripheral surface of the conductor connection terminal 121. At this time, an antioxidant is applied so that the groove of the serration 121d is filled. Thereby, a predetermined amount (for example, 1 g) of antioxidant can be easily applied regardless of the skill level of the operator. In addition, by applying an antioxidant, the surface of the aluminum conductor 111 can be prevented from being oxidized, and has a function as a lubricant during a compression operation.

  Since the high-voltage power cable has a larger outer diameter than the low-voltage covered electric wire, it is necessary to compress and connect the aluminum conductor 111 to the conductor connection terminal 121 using a compression tool such as a hexagonal die. . This is different from using a crimping tool to crimp and connect the conductor of the covered wire to the crimp terminal. Specifically, after applying an antioxidant to the insertion hole 121f of the conductor connection terminal 121, the tip of the aluminum conductor 111 is inserted into the insertion hole 121f using a predetermined compression tool (for example, a hexagonal die). The compression part 121a is uniformly pressurized toward the aluminum conductor 111 and compressed.

  In the conductor connection terminal 121, since the serration 121d is formed in the second layer L2 made of copper, there is no possibility that the serration 121d is crushed during the compression connection. Therefore, the serration 121d of the conductor connection terminal 121 bites into the aluminum conductor 111, whereby a desired retention effect is obtained, and the aluminum conductor 111 and the conductor connection terminal 121 are firmly connected.

  Furthermore, since the contact area between the conductor connection terminal 121 and the aluminum conductor 111 is increased by the serration 121d, the contact resistance can be reduced. In addition, since the amount of expansion and contraction due to heat is reduced compared to the case where the entire conductor connection terminal 121 is formed of copper, it is possible to suppress a decrease in contact resistance due to heat generation during operation. A conduction state can be ensured.

  Further, an antioxidant layer 126 is formed with a uniform thickness between the aluminum conductor 111 and the conductor connection terminal 121. Since the antioxidant layer 126 is interposed between the aluminum conductor 111 and the conductor connection terminal 121, it is possible to prevent the oxide film from being regenerated on the surface of the aluminum conductor 111, thereby ensuring good conduction.

  After the compression connection, the antioxidant leaking from the rear end portion of the conductor connection terminal 121 is wiped off with alcohol or the like. Further, a protective tape 127 (for example, a cellbon tape or the like) is wound around the rear end portion of the conductor connection terminal 121 to prevent further leakage of the antioxidant. Since the application amount of the antioxidant is appropriately controlled by the serration 121d, a large amount of the antioxidant does not protrude. Therefore, the leaked antioxidant can be easily wiped off. The leaked antioxidant does not adhere to the cable insulator 112 and the insulation performance of the cable insulator 112 is not deteriorated.

  According to the present embodiment, the overall length of the conductor connection terminal 121 can be shortened to the same extent as when the copper conductor is connected to the conductor connection terminal. Therefore, the terminal connection part of the aluminum conductor cable of the magnitude | size comparable as the terminal connection part of a copper conductor cable can be provided.

  As described above, the terminal connection portion 1 (the terminal connection portion of the aluminum conductor cable) exposes the aluminum conductor 111, the cable insulator 112, the cable outer semiconductive layer (not shown), and the cable shielding layer (not shown). It comprises an aluminum conductor cable 11 whose tip is stripped and a conductor connection terminal 121 (conductor connection member) that is attached to the tip of the aluminum conductor 111. The conductor connection terminal 121 includes an outer first layer L1 made of aluminum and an inner second layer L2 made of copper and formed integrally with the first layer L1. The second layer L1 has an insertion hole 121f into which the aluminum conductor 111 is inserted, and has a serration 121d on a contact surface in contact with the aluminum conductor 111.

  According to the terminal connection portion 1, the serration 121d formed in the second layer L2 made of copper bites into the aluminum conductor 111 without being crushed, so that the connection strength between the aluminum conductor 111 and the conductor connection terminal 121 is greatly improved. In addition, a good conduction state can be ensured. Moreover, according to the termination | terminus connection part 1, the inner side connected with the aluminum conductor 111 of the conductor connection terminal 121 (conductor connection member) is formed with the 2nd layer L2 which consists of copper, and the outer side compressed with compression tools, such as a die | dye, The first layer L1 is made of aluminum, and the first layer L1 and the second layer L2 are integrally formed by shrink fitting, for example. Thereby, compared with the case where the whole conductor connection terminal 121 is formed of copper, the thickness of the copper portion of the conductor connection terminal 121 (conductor connection member) is reduced, so that the amount of expansion / contraction due to heat is reduced. Can do. In addition, the serration 121d formed on the conductor connection terminal 121 (conductor connection member) can have a simple structure. Therefore, the aluminum conductor 111 and the conductor connection terminal 121 can be firmly connected by a simple construction work, and a compact and highly reliable terminal connection portion of the aluminum conductor cable is realized.

[Second Embodiment]
FIG. 3 is a partial cross-sectional view showing the intermediate connection portion 2 of the aluminum conductor cable according to the embodiment of the present invention. As shown in FIG. 3, the intermediate connection portion 2 of the aluminum conductor cable includes a cable terminal portion 2A, a reinforcing insulating portion 2B surrounding the cable terminal portion 2A, and a protective case 2C.

  As shown in FIGS. 3 and 4, the cable terminal portion 2 </ b> A includes a first aluminum conductor cable 21, a second aluminum conductor cable 22, and a conductor connecting pipe 23. Hereinafter, when the first aluminum conductor cable 21 and the second aluminum conductor cable 22 are not distinguished from each other, they are simply referred to as “aluminum conductor cables 21 and 22”.

  The aluminum conductor cables 21 and 22 are power cables (for example, CV cables) insulated with rubber or plastic. The aluminum conductor cables 21 and 22 are, in order from the inside, aluminum conductors 211 and 221, inner semiconductive layers (not shown), cable insulators 212 and 222, cable outer semiconductive layers 213 and 223, cable shielding layers 214, 224, cable sheaths 215, 225 and the like.

  In the cable end portion 2A, the end portions of the aluminum conductor cables 21 and 22 are stepped off at a predetermined length, so that each layer is exposed. A conductive conductor connection tube 23 is compression-connected to each of the aluminum conductors 211 and 221. The aluminum conductors 211 and 221 are electrically connected to the internal electrode 24 via the conductor connection tube 23 and a semiconductive tape (not shown). The semiconductive tape is wound so as to fill a gap between the outer periphery of the conductor connection tube 23 and the internal electrode 24, and is provided so that the outer periphery of the semiconductive tape is in contact with the inner surface of the internal electrode 24.

  The reinforcing insulating portion 2B is a one-piece rubber block insulator in which the internal electrode 24, the rubber insulating portion 25, the stress cone portions 26 and 27, and the external shielding layer 28 are integrally formed. The rubber insulating portion 25 has a cylindrical shape and is made of an elastic material such as silicone rubber. The reinforcing insulating portion 2B is not limited to silicone rubber, and may be formed of ethylene propylene rubber (EP rubber).

  The internal electrode 24 is made of, for example, semiconductive silicone rubber, and is disposed on the inner peripheral surface of the central portion in the longitudinal direction of the rubber insulating portion 25. The internal electrode 24 is electrically connected to the conductor connection tube 23 via the above-described semiconductive tape. The internal electrode 24 and the conductor connection tube 23 may be electrically connected by directly contacting the internal electrode 21 and the conductor connection tube 23, or the outer periphery of the conductor connection tube 23 is cylindrical and cut in the longitudinal direction. The conductive rubber may be wound up and electrically connected by bringing the conductive rubber into contact with the internal electrode 24. In the case where the internal electrode 24 and the conductor connecting pipe 23 are made conductive through a semiconductive tape, the semiconductive tape also serves as a protective tape for preventing further leakage of the antioxidant, and thus is more desirable from the viewpoint of reducing the number of parts. .

  The stress cone portions 26 and 27 are formed of a cylindrical body having a bell mouth shape, and are made of, for example, semiconductive silicone rubber. The stress cone portion 26 extends from the cable insulator 212 of the first aluminum conductor cable 21 to the cable outer semiconductive layer 213 (including the case where the end portion is reprocessed with a semiconductive tape or conductive paint after stripping). The end portion is formed so as to extend outward from one end portion (left end portion in FIG. 3) of the rubber insulating portion 25. The stress cone portion 27 extends from the cable insulator 222 of the second aluminum conductor cable 22 to the cable outer semiconductive layer 223 (including the case where the end portion is reprocessed with a semiconductive tape or conductive paint after stripping). The end portion is formed so as to extend outward from the other end portion (the right end portion in FIG. 3) of the rubber insulating portion 25.

  The outer shielding layer 28 has a cylindrical shape and is made of, for example, semiconductive silicone rubber. The outer shielding layer 28 is disposed on the outer peripheral surface of the rubber insulating portion 25, and is at least the end portion of the stress cone portions 26 and 27 on the center side of the connection portion (the inner diameter of the stress cone portions 26 and 27 is increased). It is formed longer than the length between the end portions). The external shielding layer 28 may be formed of a conductive paint such as a semiconductive paint.

  In the reinforcing insulating portion 2B, the outer shielding layer 28 does not contact one stress cone portion 26 (left side in FIG. 3) but only one stress cone portion 27 (right side in FIG. 3). It has become. In the reinforcing insulating portion 2B, a double-sided edge cutting structure in which the external shielding layer 28 does not come into contact with any of the stress cone portions 26 and 27 can be applied, and the external shielding layer 28 can be applied to the stress cone portions 26 and 27. It is also possible to apply a structure without borders that abuts both.

  The inner peripheral surfaces of the internal electrode 24, the rubber insulating portion 25, and the stress cone portions 26 and 27 are formed flush with each other. The internal electrode 24, the stress cone portions 26 and 27, and the external shielding layer 28 (in the case of molding) are preferably formed of the same material (for example, semiconductive silicone rubber) in terms of molding. The rubber insulating portion 25 is also preferably formed of an insulating material that does not have the same type of conductivity as these (for example, insulating silicone rubber).

  The reinforcing insulating portion 2B is held in a state where the diameter is expanded by a diameter expanding member such as a spiral core in a factory, for example. The reinforcing insulating portion 2B is disposed so as to surround the cable terminal portion 2A at the construction site, and then attached to the cable terminal portion 2A in close contact with the self-shrinking force of rubber by pulling out the diameter-expanding member. . Thereby, the insulation performance in the intermediate connection part 2 is ensured. The reinforcing insulating portion 2B is not limited to a so-called factory expansion type such as a spiral core, but may be a so-called local expansion type that expands the diameter at a construction site using a diameter expansion jig or a diameter expansion device.

  The protective case 2 </ b> C is a double-structured protective case having an inner protective tube 29 and an outer protective tube 30. A waterproof mixture (for example, a waterproof compound such as urethane) is filled between the cable terminal portion 2A and the protective case 2C and between the inner protective tube 29 and the outer protective tube 30. By the protective case 2C and the waterproof mixture, the water shielding property of the intermediate connection portion 2 of the aluminum conductor cable is ensured. The cable shielding layers 214 and 224 are grounded through the inner protective tube 29 and the outer protective tube 30.

  In the present embodiment, the conductor connection tube 23 is formed integrally with the outer first layer L1 made of aluminum and the first layer L2, similarly to the conductor connection terminal 121 in the first embodiment. And an inner second layer L2 made of copper. The first layer L1 and the second layer L2 are joined by shrink fitting, for example.

  Specifically, after the cylindrical aluminum material that forms the first layer L1 is expanded by heating, the cylindrical copper material that forms the second layer L2 is inserted and cooled to shrink the aluminum material. By doing so, the base materials are joined together. Thereafter, an insertion hole is formed in the second layer L2 by cutting. Further, serrations 23a are formed in the insertion holes.

  When connecting the conductor connection tube 23 to the tip end portions of the aluminum conductors 211 and 221, the oxide film formed on the surfaces of the aluminum conductors 211 and 221 is previously removed with a wire brush. Further, a leaking antioxidant is wound around each end face of the cable insulators 212 and 222 (a boundary surface between the aluminum conductor 211 and the cable insulator 212 and a boundary surface between the aluminum conductor 221 and the cable insulator 222). Protects the cable insulation 212, 222 from sticking.

  Next, a conductive antioxidant (anticorrosive compound) is applied to the outer peripheral surfaces of the aluminum conductors 211 and 221 and the inner peripheral surface of the conductor connection tube 23. At this time, an antioxidant is applied so that the grooves of the serrations 23a are filled. Thereby, an appropriate amount (for example, 1 g) of an antioxidant can be easily applied regardless of the skill level of the operator. In addition, by applying an antioxidant, the surface of the aluminum conductor 211 can be prevented from being oxidized, and has a function as a lubricant during a compression operation.

  Since the high-voltage power cable has a larger outer diameter than the low-voltage coated electric wire, it is necessary to compress and connect the aluminum conductors 211 and 221 to the conductor connection feeling 23 using a compression tool such as a hexagonal die. It becomes. This is different from using a crimping tool to crimp and connect a conductor of a covered electric wire to a connecting pipe (sleeve). Specifically, after applying an antioxidant to the insertion hole of the conductor connection terminal 23, the conductor connection is made using a predetermined compression tool (for example, a hexagonal die) in a state where the tip of the aluminum conductor 111 is inserted into the insertion hole. The tube 23 is uniformly pressurized and compressed toward the aluminum conductors 211 and 221.

  In the conductor connection pipe 23, since the serration 23a is formed in the second layer L2 made of copper, there is no possibility that the serration 23a is crushed during compression connection. Therefore, the serration 23a of the conductor connection tube 23 bites into the aluminum conductors 211 and 221 to obtain a desired retention effect, and the aluminum conductors 211 and 221 and the conductor connection tube 23 are firmly connected.

  Furthermore, since the contact area between the conductor connection pipe 23 and the aluminum conductors 211 and 221 is increased by the serration 23a, the contact resistance can be reduced. Moreover, since the amount of expansion and contraction due to heat is reduced as compared with the case where the entire conductor connection tube 23 is formed of copper, it is possible to suppress a decrease in contact resistance due to heat generation during operation, which is favorable. A conduction state can be ensured.

  Between the aluminum conductors 211 and 221 and the conductor connecting pipe 23, an antioxidant layer 31 is formed with a uniform thickness. Since the antioxidant layer 31 is interposed between the aluminum conductors 211 and 221 and the conductor connecting pipe 23, it is possible to prevent the oxide film from being regenerated on the surfaces of the aluminum conductors 211 and 221. Secured.

  After compression connection, the antioxidant leaking from both ends of the conductor connection tube 23 is wiped off with alcohol or the like. In addition, since the rubber block joint (RBJ) is applied in the intermediate connection portion 2 shown in FIG. 3, the semiconductive tape (not shown) is wound around both ends of the conductor connection tube 23 so that the semiconductive state is obtained. The tape acts as a protective tape and prevents further leakage of the antioxidant. Since the application amount of the antioxidant is appropriately controlled by the serration 23a, a large amount of the antioxidant does not leak out. Therefore, the leaked antioxidant can be easily wiped off. The leaked antioxidant does not adhere to the cable insulators 212 and 222, and the insulation performance of the cable insulators 212 and 222 is not deteriorated.

  According to the present embodiment, the total length of the conductor connection tube 23 can be shortened to the same extent as when the copper conductor is connected to the conductor connection tube (sleeve). Therefore, the terminal connection part of the aluminum conductor cable of the same size as the terminal connection part of the copper conductor cable can be provided.

  Thus, the intermediate connection part 2 (terminal connection part of the aluminum conductor cable) exposes the aluminum conductors 211 and 221, the cable insulators 212 and 222, the cable outer semiconductive layers 213 and 223, and the cable shielding layers 214 and 224. As described above, the aluminum conductor cables 21 and 22 having the stepped end portions and the conductor connecting tubes 23 (conductor connecting members) attached to the tip portions of the aluminum conductors 211 and 221 are provided. The conductor connection pipe 23 (conductor connection member) has an outer first layer L1 made of aluminum and an inner second layer L2 made of copper and formed integrally with the first layer L1. The second layer L2 has an insertion hole into which the aluminum conductors 211 and 221 are inserted, and has a serration 23a on a contact surface in contact with the aluminum conductors 211 and 221.

  According to the intermediate connection part 2 (terminal connection part of the aluminum conductor cable), the serrations 23a formed in the second layer L2 made of copper bite into the aluminum conductors 211 and 221 without being crushed. In addition, the connection strength between the conductor connection pipe 23 and the conductor connection pipe 23 is greatly improved, and a good conduction state can be ensured. Moreover, according to the intermediate connection part 2, the inner side connected to the aluminum conductors 211 and 221 of the conductor connection pipe 23 (conductor connection member) is formed of the second layer L2 made of copper, and is compressed by a compression tool such as a die. The outer side is formed of a first layer L1 made of aluminum, and the first layer L1 and the second layer L2 are integrally formed by shrink fitting, for example. As a result, the thickness of the copper portion of the conductor connection tube 23 (conductor connection member) is reduced compared to the case where the entire conductor connection tube 23 (conductor connection member) is formed of copper, so that expansion and contraction due to heat is caused. The amount can be reduced. Moreover, the serration 23a formed in the conductor connection pipe 23 (conductor connection member) can be made into a simple structure. Accordingly, the aluminum conductors 211 and 221 and the conductor connection pipe 23 (conductor connection member) can be firmly connected by a simple construction work, and a compact and highly reliable intermediate connection portion of the aluminum conductor cable is realized. .

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the above embodiment, and can be changed without departing from the gist thereof.

  For example, in the first embodiment, the air termination connection portion 1 using a polymer sleeve has been described. However, the present invention relates to an air termination connection portion having an internal conductor using a composite rod or a porcelain rod. It can also be applied to. Further, the present invention can be applied not to an air termination connection portion but to a gas termination connection portion or an oil termination connection portion using an epoxy bushing having an internal conductor. Furthermore, the present invention can also be applied to prefabricated joints (PJ), Y branch joints (YJ), and the like. In this case, an electrode that conducts each cable conductor embedded in the epoxy body of PJ or YJ is an internal conductor.

  Further, for example, in the second embodiment, the rubber block joint (RBJ) type intermediate connection portion 2 has been described. However, the present invention is applicable to a tape-molded connection portion (TMJ) and an extrusion mold connection portion (EMJ). Alternatively, it can be applied to a block mold type connection (BMJ).

  In the first embodiment, the antioxidant layer 126 is interposed between the aluminum conductor 111 and the conductor connection terminal 121. However, the antioxidant layer 126 may not be provided. In this case, since the troublesome application | coating operation | work of antioxidant is eliminated, the workability | operativity in the case of a compression operation improves. Even without the anti-oxidation layer 126, the copper serration 121d bites into the aluminum conductor 111 without any gaps, so that an oxide film is hardly regenerated on the conductor surface. The same applies to the second embodiment.

  In the first and second embodiments, the first layer L1 made of aluminum and the second layer L2 made of copper are joined by shrink fitting, but they are joined by casting instead of shrink fitting. You may let them.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 Terminal connection (terminal connection)
DESCRIPTION OF SYMBOLS 1A Cable terminal part 11 Aluminum conductor cable 111 Aluminum conductor 112 Cable insulator 113 Cable sheath 12 Connection component 121 Conductor connection terminal (conductor connection member)
121d Serration 121f Insertion hole 1B Polymer sleeve 13 Inner conductor 14 Insulating cylinder 15 Polymer sheath 16 Shield fitting 17 Lower fitting 18 Support insulator 19 Bottom fitting 2 Intermediate connection (terminal connection)
2A Cable terminal portion 21, 22 Aluminum conductor cable 211, 221 Aluminum conductor 212, 222 Cable insulator 213, 223 External semiconductive layer 214, 224 Cable shielding layer 215, 225 Cable sheath 23 Conductor connection pipe (conductor connection member)
23a Serration 2B Reinforcement insulation part 24 Internal electrode 25 Rubber insulation part 26, 27 Stress cone part 28 Outer shielding layer 29 Inner protection pipe 30 Outer protection pipe 31 Antioxidant layer L1 First layer L2 Second layer

Claims (7)

An aluminum conductor cable having a stepped end so as to expose an aluminum conductor, a cable insulator, a cable outer semiconductive layer, and a cable shielding layer;
A conductor connecting member attached to the tip of the aluminum conductor,
The conductor connecting member has an outer first layer made of aluminum, and an inner second layer made of copper formed integrally with the first layer;
The second layer has an insertion hole into which the aluminum conductor is inserted, and has a serration on a contact surface in contact with the aluminum conductor.   The terminal connection part of the aluminum conductor cable according to claim 1, wherein the first layer and the second layer are joined by shrink fitting or casting. The conductor connection member has a compression portion for compressing and connecting the aluminum conductor,
The terminal connection part of the aluminum conductor cable according to claim 1 or 2, wherein the second layer has the serrations at a portion corresponding to the compression part.   The terminal connection part of the aluminum conductor cable according to any one of claims 1 to 3, wherein the serration has a female screw shape. An inner conductor electrically connected to the aluminum conductor;
5. The aluminum conductor cable according to claim 1, wherein the conductor connection member is a conductor connection terminal for compressively connecting the aluminum conductor of one aluminum conductor cable. 6. Terminal connection.   5. The aluminum conductor cable according to claim 1, wherein the conductor connection member is a conductor connection pipe for compressively connecting the aluminum conductors of the two aluminum conductor cables. 6. Terminal connection.   The terminal connection part of the aluminum conductor cable as described in any one of Claim 1 to 6 which has an antioxidant layer interposed between the said aluminum conductor and the said conductor connection member.

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