TWI455430B - Connection of power cables - Google Patents

Description

Power cable connection

The present invention relates to a connection portion of a power cable, and more particularly to a connection portion of a power cable having an anchor function and an energization function in the insertion and connection portion.

Generally, as such a plug-in connection portion, there are known (a) a U-shaped contact, (b) a contact mode by a multi-head strap, (c) a wedge locking method, and the like. (For example, refer to Patent Documents 1 and 2).

Here, the U-contact method of (a) is to be fixed to the cable conductor connection terminal, and inserted into a plurality of button contacts arranged in a circular shape by a hoop spring, and the circular contact is formed and the card is inserted. The conductor connection can be made, and the contact mode of the multi-head strap of (b) is to form an annular groove on the outer circumference of the connection terminal fixed to the cable conductor, and a conductive spring is embedded in the circumferential direction. a contact (for example, a multi-head tape) is connected to the conductor by the conductor, and (c) is a wedge locking method in which the cable conductor is inserted into the conductor insertion hole via the wedge, and the lock is disposed behind the wedge. The wedges at the ends lock the fixture and are connected by conductors.

However, in the U-shaped contact method of (a), the anchor portion of the insertion connecting portion is flexible, whereby even if a bending stress is applied to the power cable to apply bending stress, it is easy to correspond, but the configuration In the above, the connection between the male side and the female side of the button can be made point-contact, which cannot correspond to the short-circuit current of the 220kV power cable (for example, 60kA, about 3 seconds). When the side is in contact with the point on the female side, the U-shaped contact is increased in diameter, and even the inner conductor is increased in diameter, which causes the bushing to have a large diameter. Further, in the contact method of the multi-head strap of (b), although the power-on function is excellent, the anchoring function is not provided, and the front end portion of the connecting terminal is bent by the compression of the connecting terminal in the large-sized cable. Even if there is an influence on the insulation properties of the interface between the stress cone and the bushing, the multi-head tape used in general, that is, as shown in Fig. 4, is punched or injected by a thick beryllium copper plate. Among the contact methods by the multi-head tape formed by the molding, there is a disadvantage that the flexibility of the energized portion is deteriorated. Further, the wedge locking method of (c) is such that the contact area between the cable conductor and the wedge lock fixture becomes small and the electric resistance becomes high, so that a large current cannot be distributed, and a rigid structure is also formed, so that flexibility is obtained. The disadvantage is that the wedge is used for the conductor connection, and thus there is a disadvantage that the connection portion cannot be reduced in diameter. Moreover, when the screw wedge locks the fixture and locks the wedge, in order to insert the installation tool or ensure the working space, the stress cone must be greatly retracted, and thus the stripping distance of the cable sheath or the like has to be lengthened, and In the way in which the conductor is connected using a wedge, when the wedge is locked by the screw and the wedge is locked, there is a chip smashing, and when the chip adheres to the interface between the receiving port of the bushing and the stress cone, it is lowered. Insulation performance, but there are concerns about insulation breakdown.

Therefore, as shown in Fig. 5, a so-called ball lock type insertion connecting portion is proposed. The plug-in connection portion of the ball lock type is, for example, shown in FIG. 1 of the patent document 3, and has an inner plug 200 that is fixed to the front end portion of the conductor 100a of the power cable 100 by compression, and is inserted into the inner plug 200. The outer circumference of the inner plug 200 is connected to the outer plug 400 between the inner conductor 300 and the inner plug 200 in the sleeve, and the inner side of the outer plug 400 is disposed with a ring movably disposed in the axial direction of the outer plug 400. The fixing fixture 500 is pressed, and the pressing fixture 500 is pushed to protrude into the positioning groove 500a of the inner conductor 300 to lock the metal ball 600 between the outer plug 400 and the inner conductor 300, and the outer plug 400 is A coil spring 700 is provided between the pressing fixtures 500.

In the plug-in connection portion of such a configuration, the stress cone 800 is pushed toward the front end portion to advance, and as shown in FIG. 5, the inner conductor 300 and the outer plug 400 are blocked to prevent the cable 100 from being occluded. Pull out. Further, as shown in Fig. 6, by retracting the stress cone 800, the locked state of the inner conductor 300 and the outer plug 400 is released, and the cable 100 can be pulled out.

Therefore, according to the plug-in connection portion having such a configuration, it is possible to surely prevent the cable from being pulled out (having an anchoring function), but the outer plug 400 is disposed outside the inner plug 200 and has an outer diameter of the plug-in connecting portion. The disadvantage of large-scale.

Patent Document 1: JP-A-7-163041 (Fig. 1, Fig. 3)

Patent Document 2: Japanese Laid-Open Patent Publication No. Hei 7-212953 (Fig. 1)

Patent Document 3: Japanese Laid-Open Patent Publication No. Hei 10-126946 (Fig. 1)

In order to solve the above-described drawbacks, the creator of the present invention has an object of providing a connection portion of a power cable having an anchor portion and an energization portion which are excellent in flexibility in the insertion and connection portion.

A connection portion of a power cable according to a first aspect of the present invention includes: an inner conductor having a cylindrical conductor insertion hole that is blocked at one end side; and a cable conductor connection that is inserted and connected to the conductor insertion hole The end portion of the cable conductor is provided with a connection terminal that is fixed to the front end portion of the cable conductor, and the connection terminal has a cylindrical pull-out portion that is inserted into the end portion of the U-shaped contact at the front end portion and is anchored. The rear end portion includes an energizing portion and a compression portion along the axial direction of the cable conductor.

According to a second aspect of the present invention, in the connection portion of the power cable of the first aspect, the cylindrical hub and the conductor insertion hole are concentrically arranged so that the center portion of the blocking portion of the inner conductor faces the drawing portion. And the other end side of the U-shaped contact is inserted into the hub, and the anchor is attached.

According to a third aspect of the present invention, in the connection portion of the power cable of the first aspect or the second aspect, the energizing portion includes an annular groove provided on an outer circumference of the connection terminal, and is embedded in the circumferential direction. A conductive spring-like contact or coil spring that is attached to the groove and is electrically accessible to the inner peripheral wall of the conductor insertion hole.

According to a fourth aspect of the present invention, in the connection portion of the power cable of the third aspect, the spring-like contact member is disposed to be parallel to the width direction of the spring-like contact, and is itself inserted into the conductor insertion hole. The plurality of contact pieces are retractable in the radial direction, and each of the contact pieces is V-shaped in the field of expansion and contraction of the contact piece.

According to a fifth aspect of the present invention, in the connection portion of the power cable of any one of the first aspect to the fourth aspect, the connecting portion between the energizing portion and the compressing portion is provided with an annular recessed portion.

According to a sixth aspect of the present invention, in the connection portion of the power cable of any of the first aspect to the fifth aspect, the outer diameter of the conducting portion is slightly smaller than the inner diameter of the conductor insertion hole. The outer diameter of the pull-out portion and the compression portion is made smaller than the outer diameter of the current-carrying portion.

The connection portion of the power cable of the present invention has the following effects.

First, a tip end portion of a connection terminal fixed to a cable conductor is provided with a cylindrical pull-out portion that is inserted into one end portion side of a ring-shaped contact that is a U-shaped contact and is anchored, thereby providing It is possible to form an anchor portion excellent in flexibility, and even a connection portion of a power cable having an appropriate anchoring function even when a cable is given a bend or the like.

Secondly, the rear end portion of the connection terminal is provided with an energizing portion along the axial direction of the cable conductor, whereby a spring-like contact having excellent current conduction performance can be provided in the current-carrying portion, for example, a multi-pressure head band is provided. A large current can flow through the multi-head strap, and even a connection portion of a power cable that can correspond to a connection portion of a large-sized, high-current power cable can be applied.

Thirdly, in the annular groove provided on the outer circumference of the energizing portion, for example, a conductive spring-like contact having a contact piece having a large expansion and contraction height is disposed in parallel with the width direction of the spring-like contact, and the conductor itself is provided to face the conductor. When a plurality of contact pieces which are extendable in the radial direction of the insertion hole are inserted into the circumferential direction, each of the contact pieces has a V-shaped conductive spring-like contact in the expansion and contraction field of the contact piece, and an electrically conductive portion having excellent flexibility can be formed. Even when there is bending at the front end portion of the compression connecting conductor or when bending force is applied to the cable, the insertion can be easily performed, and the insertion connection portion having an appropriate energization function can be provided, and the corresponding connection can be provided. Large-sized, high-current power cable connection. Further, the outer diameter of the inner conductor or the outer diameter of the bushing can be made small, and even the weight of the bushing can be obtained, and the machine can be made compact.

Fourthly, when the annular recessed portion is provided in the connecting portion between the energizing portion and the compressing portion, the recessed portion can absorb the extension or deformation of the connecting terminal when the cable conductor is compressed and connected to the connecting terminal, and even the energizing portion can be obtained. The spring-like contact is in effective electrical contact with the inner conductor.

Hereinafter, an embodiment of the connection portion of the power cable to which the present invention is applied will be described with reference to the drawings. In the following description, the "front end portion" of the bushing, the inner conductor, and the connection terminal (the pull-out portion, the energization portion, and the compression portion) are respectively referred to in the upper direction in the drawing, and in the following description, the bushing The "rear end portion" of the inner conductor and the connection terminal (the pull-out portion, the energization portion, and the compression portion) means the end portion on the opposite side to the front end portion, and corresponds to the downward direction in the drawing.

Fig. 1 is a partial cross-sectional view showing a terminal connection portion of a gas of a 220 kV large-size (e.g., 2000 m ² ) CV cable to which a connection portion of a power cable according to the present invention is applied, and Fig. 2 is a view showing the insertion of the same gas terminal connection portion. FIG. 3 is an enlarged cross-sectional view showing a connection terminal of the same insertion and connection portion.

In the first embodiment, the gas terminal connection portion of the present invention includes a machine case 1 that includes a power supply device (not shown) such as a switch or a transformer, and a front end portion is located in the machine case 1 and then The end portion is airtightly attached to the bushing 2 that closes the opening portion 11 at the peripheral portion of the opening portion 11 of the machine case 1, and the cable end 3 that is mounted in the bushing 2 and the front end portion side of the bushing 2 The annular pressing device 5 that is inserted into the stress cone 4 of the cable end 3 is pressed in the axial direction.

The bushing 2 includes a cylindrical head portion 21 provided at the front end portion, and a flange portion 23 that is connected to the rear end portion side of the head portion 21 via the electric field relaxing portion 22, and is at the rear end of the bushing 2 The push-out receiving port 24 which is reduced in diameter from the flange portion 23 toward the head portion 21 is formed concentrically with the conductor insertion hole 64 of the inner conductor 6 described later and communicates with the conductor insertion hole 64.

Here, the bushing 2 is made of an insulator such as epoxy resin, and is molded integrally with the inner conductor 6. Further, the outer diameter of the flange portion 23 of the bushing 2 is made larger than the diameter of the opening portion 11 of the machine case 1. Further, a conductive paint is applied to the outer surface of the electric field relaxing portion 22.

The inner conductor 6 includes a conductor pull-out portion 61 that protrudes from the top portion 21a of the head portion 21 of the bushing 2, and is connected to the rear end portion side of the conductor pull-out portion 61 via the neck portion 62, and the bushing The cylindrical portion 63 that is concentrically embedded in the head portion 21 of the bushing 2 is provided with a transverse cross-section from the lower end portion of the cylindrical portion 63 to the vicinity of the neck portion 62 in the cylindrical portion 63. The surface is inserted into the insertion hole 64 in a circular shape.

The conductor insertion hole 64 is provided with a pull-out portion 71 for inserting the connection terminal 7 to be described later, and the conductor insertion hole of the conductive portion 72 and the compression portion 73 in a cross-sectional view (hereinafter referred to as "first conductor insertion hole") And a conductor insertion hole having a circular cross section which is larger than the inner diameter of the first conductor insertion hole 64a and has an inner diameter which is provided on the rear end side of the first conductor insertion hole 64a (hereinafter) The first and second conductor insertion holes 64a and 64b are formed so as to be concentric with the receiving port 24 and communicate with the receiving port 24 as the "second conductor insertion hole" 64b. Moreover, the center portion of the connecting portion of the front end portion of the cylindrical portion 63 and the neck portion 62 (hereinafter referred to as "blocking portion") 65 on the side of the conductor insertion hole 64 faces the drawing portion 71 of the connecting terminal 7 The columnar hub 66 is protruded concentrically with the conductor insertion hole 64, and an annular groove (hereinafter referred to as "internal conductor side groove") 66a is provided on the outer circumference of the hub 66. Further, the inner conductor 6 is formed of a metal rod which is suitable for energization of copper or a copper alloy or aluminum or an aluminum alloy.

Here, the neck portion 62 is present at a position corresponding to the top portion 21a of the bushing 2, and the outer diameter of the neck portion 62 is made smaller than the outer diameter of the cylindrical portion 63, and the conductor pull-out portion 61 is further formed. The outer diameter is made slightly smaller than the outer diameter of the head portion 21.

The cable terminal 3 is a cable insulator 31 and a cable conductor 32 which are provided with a terminal for stripping the CV cable, and a spindle shape is provided on the outer circumference of the cable insulator 31 across the outer semiconductive layer (not shown) of the cable. Stress cone 4. Here, the stress cone 4 is formed of a rubber-like elastic insulating portion (not shown) such as ethylene propylene rubber (EP rubber) and a semiconductive portion (not shown), and is provided on the outer periphery of the insulating portion. A tapered push-out portion corresponding to the inner peripheral wall of the container port 24.

Reference numeral 7 is a connection terminal which is fixed to the distal end portion of the cable conductor 32 by compression. As shown in Fig. 2, the connection terminal 7 has a ring shape inserted into a U-shaped contact 8 as follows at the distal end portion. The cylindrical pull-out portion 71 for locking the one end side of the contact 81 is provided with an energizing portion 72 and a compressing portion 73 along the axial direction of the cable conductor 32 at the rear end portion.

The head portion (the side facing the hub 66) 71a of the pull-out portion 71 has a bullet shape, and an annular groove is formed on the outer circumference of the portion where the head portion 71a of the pull-out portion 71 and the energizing portion 72 are connected (hereinafter referred to as "Cable conductor side groove" 71b.

The conductive portion 72 is a large-diameter portion 72a having an outer diameter slightly smaller than the inner diameter of the conductor insertion hole 64, and the outer peripheral portion of the large-diameter portion 72a is provided with a conductive spring-like contact 9 to which the following conductivity is fitted. Annular groove 72b (see Fig. 3).

As the spring-like contact member 9, a multi-head tape (a La-CUT/0.25/0 (item number) manufactured by Multi-Contact Co., Ltd.) is known as a contact of a multi-face contact type. As shown in Fig. 3, the multi-head tape is provided with a plurality of contact pieces 91 which are disposed in parallel with the width direction Y of the spring-like contact members 9, and which are stretchable in the radial direction X of the conductor insertion hole 64. Each of the contact pieces 91 has a V shape in the expansion and contraction field Z of the contact piece 91.

According to the multi-head tape of such a configuration, with a thin thickness (for example, 0.25 mm), the spring characteristics of beryllium copper can be used to stabilize the contact pressure for a long period of time, and the contact resistance can be suppressed to a minimum, and the contact piece 91 can be prevented. When the expansion and contraction height is large, the energization portion of the insertion and connection portion having excellent flexibility can be formed.

The compression portion 73 is a small diameter portion 73a having an outer diameter smaller than the outer diameter of the current receiving portion 72. The small diameter portion 73a is inserted into the cable conductor 32, and a conductor insertion hole 73b for compression connection is provided. Further, an annular recessed portion 74 is provided in the connecting portion between the compressing portion 73 and the conducting portion 72.

Further, the connection terminal 7 is formed of a metal rod which is suitable for being energized by steel or a copper alloy or aluminum or an aluminum alloy.

As shown in Fig. 2, reference numeral 8 denotes a U-shaped contact for anchoring the connection terminal 7 to the inner conductor 6, and the U-shaped contact 8 is provided with a plurality of button contacts arranged in a circular shape. The annular contact 81 of 81a and a pair of hoop springs 82a and 82b which are disposed on the upper and lower outer circumferences of the annular contact 81. Further, an annular convex portion (hereinafter referred to as "internal conductor side annular convex portion") 83a for locking the inner conductor side groove 66a is provided on the inner circumference of the one end portion side of the annular contact 81. An annular convex portion (hereinafter referred to as a "connection terminal side annular convex portion") 83b for locking the cable conductor side concave groove 71b is provided on the inner circumference of the other end side of the annular contact 81.

Hereinafter, a method of assembling the terminal connection portion in the gas of the present invention thus constituted will be described.

First, the hub 66 constituting the inner conductor 6 of the bushing 2 is inserted into the one end side of the annular contact 81 constituting the U-shaped contact 8, so that the inner conductor side annular convex portion 83a is locked to the inner conductor side groove 66a. . Further, the cable conductor 32 is inserted into the conductor insertion hole 73b of the compression portion 73 constituting the connection terminal 7, and is compressed so that the connection terminal 7 is fixed to the cable conductor 32. Further, a stress cone 4 is attached to the outer circumference of the insulator 31 in advance (before compression). Further, before the stress cone 4 is attached to the CV cable, a cable protection fixture (not shown) or a pressing device 5 of the stress cone 4 is inserted.

As described above, the terminal portion 3 of the previously processed CV cable is provided with a front end portion in the bush 2 .

At this time, the conductor terminal 7 constituting the end portion of the cable conductor connection is pressed into the conductor insertion hole 64 of the inner conductor 6, so that the bullet-shaped front end portion of the pull-out portion 71 abuts on the U-shaped joint 8 The connection terminal side annular convex portion 83b of the annular contact 81 is pushed into the conductor insertion hole 64 by the pull-out portion 71, so that the pull-out portion 71 resists the spring force of the hoop springs 82a, 82b. The annular contact 81 is expanded in the radial direction and pressed against the hub 66 of the inner conductor 6. When the pull-out portion 71 is pushed into the conductor insertion hole 64, the other end side annular convex portion 83b of the annular contact 81 forming the U-shaped contact 8 is fitted to the cable constituting the pull-out portion 71 of the connection terminal 7. The conductor side groove 71b.

Further, the stressor cone 4 is pressed toward the distal end portion side by the pressing device 5 which is previously inserted into the cable terminal 3 side, so that the push-out outer peripheral portion of the stress cone 4 is pressed into the receiving port 24 of the bushing 2 The wall surface is even secured by the insulation between the inner wall surface of the receiving port 24 and the outer peripheral surface of the insulating portion of the stress cone 4.

As described above, in the connection portion of the power cable according to the present invention, first, the end portion of the connection terminal 7 fixed to the cable conductor 32 is provided with one end inserted into the annular contact 81 as the U-shaped contact 8. The cylindrical pull-out portion 71 for anchoring on the side of the portion, thereby providing an anchor portion having excellent flexibility, and even a connection portion of a power cable having an appropriate anchoring function even when the cable is bent or the like.

Secondly, the rear end portion of the connection terminal 7 is provided with the energization portion 72 along the axial direction of the cable conductor 32, whereby a spring-like contact 9 excellent in current conduction performance can be provided in the conduction portion 72, for example, A multi-head strap is provided, and a large current can flow through the multi-head strap, and even a connection portion of a power cable that can correspond to a connection portion of a large-sized, high-current power cable can be applied.

Third, in the annular groove 72b provided on the outer circumference of the energizing portion 72, for example, a conductive spring-like contact 9 having a contact piece 91 having a large expansion and contraction height is disposed in parallel with the width direction Y of the spring-like contact member 9, Further, it has a plurality of contact pieces 91 which are expandable and contractible in the radial direction X of the conductor insertion hole 64, and a V-shaped conductive spring-like contact is formed in the expansion and contraction field Z of the contact piece 91 in the circumferential direction. In the case of sub-9, it is possible to form the energizing portion 72 having excellent flexibility, and it is easy to insert even when the front end portion of the compressed connecting conductor is bent or when the bending force is applied to the cable, and it is possible to provide appropriate The plug-in connection portion of the energization function can provide a connection portion that can correspond to a large-sized, high-current power cable. Further, the outer diameter of the inner conductor or the outer diameter of the bushing can be made small, and even the weight of the bushing can be obtained, and the machine can be made compact.

Fourth, when the annular recessed portion 74 is provided in the connecting portion between the energizing portion 72 and the compressing portion 73, the recessed portion 74 can absorb the extension or deformation of the connecting terminal 7 when the cable conductor 32 is compressed and connected to the connecting terminal 7. Even the effective electrical contact of the spring contact 9 of the energizing portion 72 with the inner conductor 6 can be obtained.

In the above-described embodiments, the present invention will be described with reference to the specific embodiments shown in the drawings. However, the present invention is not limited to the embodiments, and the effects of the present invention can be exerted as follows. Composition.

First, in the above-described embodiment, the case where the spring-like contact member 9 is fitted in the annular groove 72b constituting the energizing portion 72 will be described. However, instead of the spring-like contact member 9, a conductive spiral may be embedded. spring.

Secondly, in the above-described embodiment, the case where the energizing portion 72 is provided between the drawing portion 71 and the compressing portion 73 will be described, but the energizing portion 72 may be provided on the rear end side of the compressing portion 73.

Thirdly, in the above embodiment, in the case of being applied to the terminal connection portion in the gas, the terminal connection portion in the oil or the terminal connection portion in the gas may be applied.

Fourthly, the size of the cable conductor 32 to be mounted on the bushing 2 is not limited to 2000 mm ² , and may be more than 2000 mm ² or less than 2000 mm ² .

Fifth, the cable installed in the bushing 2 is not limited to the rated voltage of 220 kV, but can also be applied to a rated voltage of less than 220 kV or a rated voltage exceeding 220 kV.

2. . . Bushing

twenty four. . . Acceptance

3. . . Cable terminal

6. . . Internal conductor

64. . . Conductor insertion hole

7. . . Connection terminal

71. . . Pull out

72. . . Power supply department

72b. . . Groove

73. . . Compression department

74. . . Depression

8. . . U-shaped contact

9. . . Spring-like contact

91. . . Contact sheet

Fig. 1 is a partial cross-sectional view showing an example of a connection portion of a power cable according to the present invention.

Fig. 2 is an enlarged cross-sectional view showing the plug connector shown in Fig. 1.

Fig. 3 is an enlarged cross-sectional view showing the connection terminal shown in Fig. 2;

Fig. 4 is an explanatory view showing a conventional spring contact (multiple head band).

Fig. 5 is a partial cross-sectional view showing a connecting portion of the power cable of the present invention.

Fig. 6 is a partial cross-sectional view showing a connecting portion of the power cable of the present invention.

1. . . Machine box

2. . . Bushing

3. . . Cable terminal

4. . . Stress cone

5. . . Ring pusher

6. . . Internal conductor

7. . . Connection terminal

11. . . Opening

twenty one. . . head

21a. . . top

twenty two. . . Electric field mitigation section

twenty three. . . Flange

twenty four. . . Acceptance

31. . . Cable insulator

32. . . Cable conductor

61. . . Conductor pull-out

62. . . neck

63. . . Cylindrical part

64. . . Conductor insertion hole

64a. . . First conductor insertion hole

64b. . . Second conductor insertion hole

65. . . Blockade

66. . . hub

Claims (6)

A connection portion of a power cable, comprising: an inner conductor having a cylindrical conductor insertion hole that is blocked at one end side; and a cable conductor connection end that is inserted and connected to the conductor insertion hole, the cable conductor The connection end portion is provided with a connection terminal fixed to a front end portion of the cable conductor, and the connection terminal has a cylindrical pull-out portion that is inserted into the one end portion side of the U-shaped contact at the front end portion and is anchored at the rear end. The portion includes an energizing portion and a compressing portion along an axial direction of the cable conductor, and a cylindrical boss is formed concentrically with the conductor insertion hole so that a central portion of the blocking portion of the inner conductor faces the drawing portion. The other end side of the U-shaped contact is inserted into the hub and anchored. A connection portion of a power cable, comprising: an inner conductor having a cylindrical conductor insertion hole that is blocked at one end side; and a cable conductor connection end that is inserted and connected to the conductor insertion hole, the cable conductor The connection end portion is provided with a connection terminal fixed to a front end portion of the cable conductor, and the connection terminal has a cylindrical pull-out portion that is inserted into the one end portion side of the U-shaped contact at the front end portion and is anchored at the rear end. The portion includes an energizing portion and a compressing portion along an axial direction of the cable conductor, and a cylindrical boss is formed concentrically with the conductor insertion hole so that a central portion of the blocking portion of the inner conductor faces the drawing portion. in The hub is inserted and anchored to the other end side of the U-shaped contact, and the energizing portion includes an annular groove provided on an outer circumference of the connection terminal, and is fitted in the groove along the circumferential direction. It is electrically accessible to the conductive spring-like contact or coil spring of the inner peripheral wall of the above-mentioned conductor insertion hole. A connection portion of a power cable, comprising: an inner conductor having a cylindrical conductor insertion hole that is blocked at one end side; and a cable conductor connection end that is inserted and connected to the conductor insertion hole, the cable conductor The connection end portion is provided with a connection terminal fixed to a front end portion of the cable conductor, and the connection terminal has a cylindrical pull-out portion that is inserted into the one end portion side of the U-shaped contact at the front end portion and is anchored at the rear end. The portion includes an energizing portion and a compressing portion along an axial direction of the cable conductor, and a cylindrical boss is formed concentrically with the conductor insertion hole so that a central portion of the blocking portion of the inner conductor faces the drawing portion. The other end portion of the U-shaped contact is inserted into the hub and anchored, and the energizing portion includes an annular groove provided on an outer circumference of the connection terminal, and is fitted in the concave direction along a circumferential direction. The groove itself is electrically contactable to the conductive spring-like contact of the inner peripheral wall of the conductor insertion hole, and the spring-like contact is provided with the spring-like contact Direction parallel to each other are arranged, and which inserts itself radial hole retractable toward the plurality of conductive contact pieces, each contact piece in the contact The stretched field of the sheet has a V shape. A connection portion of a power cable, comprising: an inner conductor having a cylindrical conductor insertion hole that is blocked at one end side; and a cable conductor connection end that is inserted and connected to the conductor insertion hole, the cable conductor The connection end portion is provided with a connection terminal fixed to a front end portion of the cable conductor, and the connection terminal has a cylindrical pull-out portion that is inserted into the one end portion side of the U-shaped contact at the front end portion and is anchored at the rear end. The portion includes an energizing portion and a compressing portion along an axial direction of the cable conductor, and a cylindrical boss is formed concentrically with the conductor insertion hole so that a central portion of the blocking portion of the inner conductor faces the drawing portion. The other end portion of the U-shaped contact is inserted into the hub and anchored, and the energizing portion includes an annular groove provided on an outer circumference of the connection terminal, and is fitted in the concave direction along a circumferential direction. a groove, which is electrically contactable with a conductive spring-like contact or a coil spring of the inner peripheral wall of the conductor insertion hole, and is provided at a connection portion between the current-carrying portion and the compression portion An annular recess portion. A connection portion of a power cable, comprising: an inner conductor having a cylindrical conductor insertion hole that is blocked at one end side; and a cable conductor connection end that is inserted and connected to the conductor insertion hole, the cable conductor The connecting end is provided with a cable conductor a connection terminal of the distal end portion, wherein the connection terminal has a cylindrical pull-out portion that is inserted into one end portion of the U-shaped contact portion and is anchored at the distal end portion, and has a current-carrying portion along the axial direction of the cable conductor at the rear end portion. And a compression portion having a cylindrical boss projecting concentrically with the conductor insertion hole at a center portion of the blocking portion of the inner conductor, and a further insertion of the U-shaped contact in the hub The one end portion side is anchored, and the energizing portion includes an annular groove provided on an outer circumference of the connection terminal, and is fitted in the groove along a circumferential direction, and is electrically contactable with the conductor itself a conductive spring-like contact of the inner peripheral wall of the insertion hole, wherein the spring-like contact member is disposed to be parallel to the width direction of the spring-like contact, and is itself extendable in the radial direction of the conductor insertion hole In the plurality of contact pieces, each of the contact pieces has a V shape in the field of expansion and contraction of the contact piece, and an annular recessed portion is provided in the connection portion between the current supply portion and the compression portion. The connection portion of the power cable according to any one of the first to fifth aspect, wherein the outer diameter of the current-carrying portion is slightly smaller than an inner diameter of the conductor insertion hole, and the pull-out is performed. The outer diameter of the portion and the compression portion is made smaller than the outer diameter of the current-carrying portion.