JP3242029B2 - How to connect the power cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for connecting an intermediate connection portion of a crosslinked polyethylene insulated power cable (CV cable) via a conductor joint provided on a high-voltage shield electrode of a block-molded reinforcing insulator. The present invention relates to a power cable connection method that can be easily fixed to a high-voltage shield electrode and does not move with respect to the high-voltage shield electrode.

[0002]

2. Description of the Related Art For example, it is known that a connecting portion of a large-capacity power cable having a large conductor cross-sectional area such as a CV cable is formed by using a block-molded reinforced insulator integrally formed of a rubber or plastic material. Kaihei 8-17540
It is a means conventionally used as shown in Japanese Patent Application Publication No. In the conventional cable connection means,
A copper conductor connector is fixed to the tip of the cable conductor, and the conductor connector attached to the tip of the two cable conductors to be connected is inserted in a state of facing the copper cylindrical conductor joint, Try to get cable continuity.

In the conventional example, each of the two conductor connectors inserted into the cylindrical conductor joint is provided with a locking means between the two conductor connectors and the cylindrical conductor joint. With the conductor connector inserted into the conductor joint, the step formed inside the cylindrical conductor joint and the step formed at the tip of the conductor connector are locked, so that the conductor connector has a cylindrical shape. Means is provided for preventing the conductor joint from coming off. As the cylindrical conductor joint, a pleated polyhedral contact (hereinafter referred to as a "louver") is provided around the inner surface of a cylindrical member made of copper or the like having good conductivity, and the louver relates to pressing against the conductor connector. A structure that performs a stopping action and can achieve conduction between two cables is also used.

[0004] A connection portion for a power cable as shown in the above-mentioned conventional example is configured as shown in FIG. 10, for example. The connection portion 10 for a cable is composed of conductors 2 of two cables 1 and 1a. , 2a, the conductor connectors 6, 6
a are provided integrally. Then, the conductor connectors 6, 6a are inserted into the through holes of the cylindrical conductor joint 7 from both sides thereof, thereby constituting a means for setting the conductive state of the conductors via the cylindrical conductor joint. The cable connection part 1
0, the high-voltage shield electrode 11 is arranged at a position corresponding to the cylindrical conductor joint 7 and the reinforcing insulator 1
2 is arranged. The reinforcing insulator 12 is integrally formed using a rubber / plastic material such as an uncrosslinked polyethylene resin to which a crosslinking agent is added, and is configured as a block mold type connection portion having a predetermined length and a cone shape.

In the cable connection section, a reinforcing insulator 1
2, a semiconductive layer 13 is arranged around the outer periphery, a waterproof mixture is formed at a predetermined thickness on the outer periphery thereof, and a metal protection tube 15 is arranged around an outer periphery of an insulator 14 made of the waterproof mixture. I do.
In the case where an insulating connection portion is formed with respect to the protective tube 15, a means for arranging the insulating tube 16 at a predetermined position, arranging a terminal seat 17 with respect to the protective tube 15, and connecting to the ground is provided. ing. Further, a waterproof layer 18 is disposed so as to cover both ends of the insulating tube 16 and a connection portion with the cable sheath tube, and the waterproof layer 18 is formed by means such as winding a waterproof tape. It constitutes means for preventing moisture and the like from entering inside.

[0006] In the case of forming the connecting portion as shown in FIG. 10, through the steps shown in FIGS. 11 to 14,
As shown in FIG. 15, a conductive portion of the cable is formed via the reinforcing insulator 12, thereby forming a connecting portion as shown in FIG. After that, the respective components are arranged around the connection portion to configure the cable connection portion 10 of FIG. When the cable is connected, first, as shown in FIG. 11, a bend or the like at the end of the cable to be connected is corrected, then the cable sheath 5 is removed, and a semiconductive material is connected from the distal end of the cable 1. The layer 4 is peeled off leaving a predetermined length, and the insulator 3 is exposed to a predetermined length on the tip side.

Next, as shown in FIG. 12, the insulator 3 is removed so that the cable conductor 2 protrudes, and the tip of the insulator 3 is formed by performing a pencil ring process. The operation of exposing the conductor is performed for each of the two cables facing each other. Thereafter, as shown in FIG. 13, the conductor connectors 6 and 6a are attached to the tip of the conductor 2, respectively. Next, as shown in FIG. 14, the operation of inserting and fixing the two conductor connectors 6, 6a into the insertion holes 12a of the reinforcing insulator 12 is performed, and as shown in FIG.
A connection is formed in which the ends of the cables are fixed to each other in the reinforcing insulator 12. The reinforcing insulator 12 is made of an uncrosslinked polyethylene resin or the like to which a crosslinking agent has been added. The reinforcing insulator 12 is provided with a high-voltage shield electrode 11 at the center of the insertion hole 12a. A conductor joint 7 is provided. The conductor connectors 6, 6a of the two cable conductors 2, 2a are connected via the cylindrical conductor joint 7 while being positioned at the center of the high-voltage shield electrode 11.

After the conductor connectors 6, 6a of the two cable conductors 2, 2a are connected inside the reinforcing insulator 12, as shown in FIG. And a process of applying heat and pressure from around the reinforcing insulator is performed. Then, by performing the above-described treatment, the uncrosslinked polyethylene resin to which the crosslinking agent for the reinforcing insulator is added is crosslinked, and the inner surface of the reinforcing insulator is brought into close contact with the surface of the cable insulator, and between the two members. No gaps or the like are formed. After performing the above-described processing, an operation of attaching a covering member around the connection portion is performed to form a cable connection portion as shown in FIG.

In the above-mentioned conventional example, when forming a cable connecting portion, a connecting means as shown in FIG. 16 is used to mutually fix the conductor connectors attached to the two cable conductor ends. In the connection means, a fixing member as shown in FIG. 17 is used. In the example shown in FIGS. 16 and 17, in the fixed portion where the conductor connectors 6 and 6 a are combined, in order to connect the cable conductors 2 and 2 a to each other, each distal end member of the conductor connectors is provided as a connector. The insertion-side connection tool 30 and the locking-side connection tool 40 are respectively attached. In addition, in the example shown in FIG. 16, the inner surface of the through-hole into which the conductor connector of the conductor joint 7 is inserted is provided with the conductor joint in order to favorably set the conduction between the conductor joint and the conductor connector. A pleated multifaceted contact (louver) 8 is provided circumferentially on the inner surface of the through hole. The louver 8 is a thin belt-shaped member made of a copper alloy or the like,
A large number of notches are provided at predetermined intervals, and the upper and lower surfaces of the notches are pressed between the outer periphery of the insertion portion of the conductor connector and the inner periphery of the hole of the conductor joint so as to press the folds of the louver. I do.

The conductor connector 6 is made of a metal such as copper or the like. A hole for inserting the conductor is provided in the base portion, and the conductor is inserted into the hole and a tightening action is applied. Integrate. Further, a small-diameter distal end member corresponding to the cylindrical conductor joint is provided protrudingly at the distal end side of the conductor connector 6, and a concave hole having a predetermined depth is provided from the distal end side of the distal end member. , A screw portion is provided on the inner surface of the hole. Also,
A conductor connector 6a is formed symmetrically to the conductor connector 6, and two opposing conductor connectors 6, 6
The two conductor connectors are fixed so that the screw portion of the insertion-side connecting tool and the locking-side connecting tool as a connecting tool are engaged with the threaded portion provided on the distal end member a, so that the fixed portion is formed. To

The insertion-side connection device 30 and the locking-side connection device 40 as connection devices disposed on the fixing portion are configured as shown in FIG. 17, and are connected to the conductor connector 21 on the cable conductor 2 side. The insertion-side connecting tool 30 to be attached has a screw portion 31 provided on the outer peripheral portion of a cylindrical main body member. Further, a head member 33 is provided on a tip end side of the main body member through a tapered portion 32 so as to protrude therefrom.
The locking member 34 is provided through the interposition 5, and the locking member 34 is arranged at a plurality of predetermined intervals in the radial direction with respect to the axis of the main body.

The locking-side connector 40 to be combined with the insertion-side connector 30 has a space portion 43 dug from a surface corresponding to the insertion-side connector on the inner surface of the main body having a screw portion 41 on the outer peripheral surface. Is provided. A projecting portion provided with a tapered surface 42 is provided at a portion of the space 43 on the entrance side, and the rear surface of the projecting portion is configured as a locking step portion 44. Then, the insertion-side connector 30 is connected to the locking-side connector 40 shown in FIG.
When the fixing portion 20 is formed as shown in FIG. 16 by mounting the fixing member 20, the locking member 34 of the insertion-side connecting tool is expanded, and the rear portion of the locking member 34 is locked by the locking step portion 44. In this state, the insertion-side connecting device and the locking-side connecting device are fixed, so that even if a tensile force is applied in the axial direction of the cable, the fixed state of the conductor connector at the fixing portion can be maintained. Is done.

[0013]

When a fixing portion as shown in FIG. 16 is constructed, a conductor joint for inserting and fixing and positioning two conductor connectors, as shown in FIG. It is mounted inside the shield electrode via a screw engaging portion 55. The high-voltage shield electrode 50 is provided to alleviate electrical stress at the connection between the two conductor connectors 6 and 6a. In the example shown in FIG. Attach the joint by screw engagement. In addition, in the conventional example described below and the embodiment of the present application, the high-voltage shield electrode is denoted by reference numeral 50, and the conductor joints are denoted by reference numerals different from reference numeral 60, respectively. Through hole 5
A method is employed in which an external thread portion of the conductor joint 60 is engaged with and fixed to a thread engaging portion 55 provided in the inside 1.

However, in the conventional screw engagement portion using the screw engagement as shown in FIG. 18, since the screw portion is formed to be relatively long, a conductor joint is provided with respect to the high-voltage shield electrode. The operation for mounting the horn is troublesome, and there is a problem that much time is required for assembly. Also, since the conductor joint is held by the high-voltage shield electrode only at the threaded portion, if vibrations are applied to the connection portion, the conductor joint is likely to rotate with respect to the high-voltage shield electrode, and the screw is loosened. Is concerned.

The present invention solves the above-mentioned problem of attaching the conventional conductor joint to the high-voltage shield electrode, and the rotation of the conductor joint is achieved by combining a concave groove and a ridge in the engaging portion of both members. It is an object of the present invention to provide a connection method for fixing a conductor joint by combining a means for preventing the occurrence of an electric current and a separate ring-shaped screw member.

[0016]

SUMMARY OF THE INVENTION The present invention relates to a reinforcing insulator which is integrally molded in advance with a rubber / plastic material and has a high-voltage shield electrode and a conductor joint arranged at the center of a through hole provided in the longitudinal direction. A conductor connector is provided at each of the distal ends of the two cable conductors to be connected, and a connector is provided for each of the conductor connectors, and a conductor connector is used from both sides of a through hole of the reinforcing insulator. The present invention relates to a method for connecting a power cable, which is inserted and assembled in a state where the connecting tools are abutted with each other to obtain cable continuity. The invention according to claim 1 of the present invention is characterized in that a small-diameter portion is provided at a position where the conductor joint of the hole provided in the high-voltage shield electrode is fixed, and a small-diameter portion is provided adjacent to a shoulder at an end of the small-diameter portion. An inner thread portion for locking the ring-shaped screw member is provided, and on the inner surface of the small-diameter portion of the hole of the high-voltage shield electrode, a ridge or a groove provided in the direction in which the conductor joint is inserted is provided. The conductor joint to be inserted has a groove or a ridge corresponding to the ridge or groove provided on the high-voltage shield electrode on the outer peripheral portion thereof, and a step portion which is engaged with a shoulder of a small diameter portion of the high-voltage shield electrode. And a combination of the groove and the ridge, in which a tapered portion and / or an expanded portion are formed at the insertion-side tip of the ridge and the insertion-side tip of the groove, Combine ridges and grooves with high voltage shield electrode Allowed by wearing the conductor joint, it is engaged with the stepped portion to the shoulder portion,
By attaching a ring-shaped screw member to the inner thread portion in the through hole of the high-voltage shield electrode, the step portion of the conductor joint is pressed and fixed, and the conductors respectively provided at the distal end portions of the two cable conductors to be connected. The connector is inserted and fixed. The invention according to claim 2 is characterized in that the high-pressure shield electrode has a hole formed on the inner surface of the hole and a concave groove corresponding to the protrusion on the outer periphery of the conductor joint. By mounting the conductor joint in combination with the concave groove on the ridge provided on the inner surface of the conductor, positioning the conductor joint with respect to the small diameter portion of the hole of the high-voltage shield electrode, and forming the conductor joint with a ring-shaped screw member It is characterized by being pressed and fixed in a high-voltage shield electrode.

[0017] With the above-described configuration, in the present invention, the operation of assembling the conductor joint to the high-voltage shield electrode can be easily performed, and the reliability of the assembly is set to a favorable state. Is possible. Then, even when a rotational force is applied from the cable to the conductor joint, the force is transmitted so as to rotate integrally with the high-voltage shield electrode, so that an adverse effect on the reinforcing insulator occurs inside the cable connection portion. Never. Also,
When the conductor joint is attached to the high-voltage shield electrode, it is possible to cope with the force in the rotational direction by combining the ridge and the groove, and to cope with the cable in the axial direction by a connector in the conductor joint. Therefore, the connection operation of the cable can be favorably maintained.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an apparatus according to the present invention and a connection method will be described with reference to the illustrated example. The embodiment described below is applied to a case where a cable connecting portion using a block mold reinforcing insulator as shown in FIG. 10 is formed through an assembling process as shown in FIGS.
A case where a new conductor joint fixing means is used instead of the mechanism for fixing and holding the conductor joint as shown in FIG. The embodiment of the present invention shown in FIG.
0 shows the case where the conductor joint 60 is attached to
The high-voltage shield electrode 50 is disposed so as to be integrally embedded in the center of the through hole when the block mold reinforcing insulator is formed.

The high-voltage shield electrode 50 has a structure as shown in the sectional view of FIG. 2 and the front view of FIG. 3 as viewed from the left side thereof. At the position where the conductor joint is mounted with respect to the hole 51, the ridges 52 are provided at positions symmetrical with respect to the center axis.
... are provided to protrude. Also, the step on the right side of the ridge is a shoulder 53, which is used as a means for positioning the conductor joint. Further, an internal thread portion 54 is provided at a predetermined interval with respect to the shoulder portion 53, and the conductor joint 60 is locked by attaching a ring-shaped screw member 65 to the internal thread portion 53.

As shown in the sectional view of FIG. 4 and the front view of FIG. 5 as viewed from the left side, the conductor joint 60 mounted inside the high-voltage shield electrode 50 has a cylindrical member surrounding a cylindrical member. Grooves 62 corresponding to the ridges of the high-voltage shield electrode
Are provided at predetermined lengths, and shoulder portions 63 are provided at the ends of the concave grooves. Further, a stepped portion 64 is provided at the right end of FIG. 4 in a state in which the outer peripheral portion of the conductor joint is cut out by a predetermined length, and a ring-shaped screw shown in FIG. The member 65 is positioned. On the outer peripheral portion of the conductor joint 60, a plurality of concave grooves 62 are arranged at a predetermined length from one end in the length direction, and a step portion 64 is formed in a ring shape from the other end, A cylindrical portion is provided between the step and the groove. Further, a ring-shaped concave groove is provided on the inner surface of the through hole 61 of the conductor joint 60, and the louvers 8 are formed in the same manner as in the example shown in FIGS.
Are arranged at predetermined intervals.

The high voltage shield electrode 50 and the conductor joint 60
When the combination shown in FIG. 1 is combined to form the combination shown in FIG. 1, first, one side of the through-hole provided in the reinforcing insulator with respect to the high-voltage shield electrode 50 integrally provided inside the reinforcing insulator. Then, the conductor joint 60 is inserted. Then, the ridge 52 of the high-voltage shield electrode is positioned and pushed into the concave groove 62 provided in the conductor joint 60, and the right shoulder 5 of the ridge is formed.
3 is stopped at a position where it contacts the shoulder 63 of the conductor joint.
Thereafter, a ring-shaped screw member 65 is inserted from the side where the conductor joint is inserted, and screwed into the inner threaded portion 54 of the high-voltage shield electrode.
4 until it is pressed. As described above, by attaching the conductor joint to the high-voltage shield electrode, the conductor joint is fixed to the central portion of the through hole of the reinforcing insulator, and the conductor connector is inserted from both sides of the through hole and connected. Connections for cable conductors can be formed.

When the conductor joint is mounted on the high-voltage shield electrode, the shoulder of the groove provided in the conductor joint is locked to the end of the ridge, and the ring-shaped screw member 65 is engaged from the other end.
And the conductor joint is fixed inside the high-voltage shield electrode without moving in the axial direction. And, since the concave groove of the conductor joint is combined with the protrusion provided on the high-voltage shield electrode, a force in the cable rotation direction is applied through the conductor connector connected via the conductor joint. Even in this case, since the conductor joint rotates integrally with the high-voltage shield electrode, there is no problem that the conductor joint comes off from the high-voltage shield electrode. Further, the ring-shaped screw member 65 for fixing the conductor joint inside the high-voltage shield electrode is only engaged with the step portion of the conductor joint, and when a force acting to rotate the conductor joint is applied. However, since a force for rotating the ring-shaped screw member does not act, the pressing action of the conductor joint by the ring-shaped screw member can be favorably exhibited.

[0023]

EXAMPLE In addition to the example shown in FIG. 1, as shown in FIG. 6, a small-diameter portion 56 is provided in a conductor joint mounting portion of a high-voltage shield electrode 50, and a concave groove 57 is provided in the small-diameter portion 56. 7, the ridge 6 provided at the tip of the conductor joint 60 as shown in FIG.
7 can be inserted for positioning and fixing. Also in the examples shown in FIGS. 6 and 7, the conductor joint attached to the high-voltage shield electrode is formed by attaching the ring-shaped screw member to the inner thread portion 54 after being attached in combination with the ridge and the concave groove. By mounting, it can be mounted and fixed similarly to the example of FIG.

Also, as shown in FIG.
It is also possible to use means for attaching the conductor joint to the high-voltage shield electrode and preventing rotation of the conductor joint in a state in which the two grooves are combined. As shown in FIG.
In the case where one ridge and a groove are provided, it is assumed that a large force is applied to the engagement portion. Therefore, the width of the ridge is set to be large, and the strength of the ridge against shearing is set. Can be increased. In the combination of the ridge and the groove, when attaching the conductor joint to the high-voltage shield electrode, if it is difficult to insert the tip of the ridge into the groove,
As shown in FIG. 9, an enlarged portion 57 a may be provided at the distal end of the concave groove 57, or a tapered portion 67 a in which the distal end of the ridge 67 is tapered may be provided. Further, by providing the widened portion and the tapered portion so as to face each of the two members, it is possible to easily perform the operation of mounting the ridges provided on the high-voltage shield electrode and the conductor joint in the concave groove. .

As shown in FIGS. 2 and 4, in the case where the protruding ridge 52 of the high-voltage shield electrode is inserted into the concave groove 62 of the conductor joint, the expanded portion and the tapered portion are formed on each member. By providing the conductor joint, the work of attaching the conductor joint to the high-voltage shield electrode can be facilitated. Further, in addition to the above embodiments, a ridge and a concave groove are provided for the high-voltage shield electrode and the conductor joint, respectively, and the concavities and convexities of both members are combined so that the conductor is connected to the high-voltage shield electrode. It is also possible to use a mechanism in which joints are combined and positioned and fixedly held by a ring-shaped screw member. Therefore, in the present invention, a conductor joint to be fixedly held by being attached to the high-voltage shield electrode,
The combination of the ridge and the groove makes it impossible to fix in a non-rotatable state, and to fix it in a state where it is prevented from moving in the axial direction by the uneven shoulder and the ring-shaped screw member. Can be used.

[0026]

According to the present invention, since the connection is made by using the members constructed as described above, the work of assembling the conductor joint to the high-voltage shield electrode can be easily performed, and the reliability of the assembly part can be improved. Can be set to a favorable state. Then, even when a rotational force is applied from the cable to the conductor joint, the force is transmitted so as to rotate integrally with the high-voltage shield electrode, so that an adverse effect on the reinforcing insulator occurs inside the cable connection portion. Never. In addition, when the conductor joint is mounted on the high-voltage shield electrode, it is possible to cope with the force in the rotational direction by combining the ridge and the concave groove, and in the axial direction of the cable, a connector in the conductor joint is used. In order to cope with this, the connection effect of the cable can be maintained well.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an assembled state of a high-voltage shield electrode and a conductor joint according to the present invention.

FIG. 2 is a sectional view of a high-voltage shield electrode.

FIG. 3 is a front view of the high-voltage shield electrode of FIG. 2;

FIG. 4 is a sectional view of a conductor joint.

FIG. 5 is a front view of the conductor joint of FIG. 4;

FIG. 6 is an explanatory diagram of a second embodiment of the present invention.

FIG. 7 is a front view of FIG. 6;

FIG. 8 is an explanatory diagram of an example in which one protrusion and a groove are provided.

FIG. 9 is an explanatory diagram of an example in which a ridge is easily inserted into a concave groove.

FIG. 10 is an explanatory diagram showing a configuration of a general cable connection portion.

FIG. 11 is an explanatory view of a state in which a jacket member at a cable tip is removed.

FIG. 12 is an explanatory diagram of a state where processing for exposing a conductor is performed.

FIG. 13 is an explanatory view showing a state where a conductor connector is attached to the tip of two conductors to be connected.

FIG. 14 is an explanatory diagram of a state where one of the cables is inserted into a reinforcing insulator.

FIG. 15 is an explanatory diagram of a state in which two cable conductors are connected via a reinforcing insulator.

FIG. 16 is an explanatory view of a conventional fixing unit.

FIG. 17 is an explanatory diagram showing a configuration of an insertion-side connecting tool and a locking-side connecting tool used in FIG. 16;

FIG. 18 is an explanatory view of a state in which a conductor joint is attached to a conventional high-voltage shield electrode.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cable, 2 Cable conductor, 6 Conductor connector, 7 Cylindrical conductor joint, 10 Cable connection part, 12 Reinforcement insulator, 15 Protection tube, 16
Insulation tube, 30 insertion-side connection tool, 33 head member, 34 locking member, 40 locking-side connection tool,
44 locking step, 50 high voltage shield electrode, 52
Ridge, 53 shoulder, 54 internal thread, 56
Small diameter part, 57 concave groove, 60 conductor joint, 6
2 groove, 63 shoulder, 64 step, 65
Ring screw member, 67 ridge.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02G 1/14 H02G 15/00 H01R 4/00 H01R 43/00

Claims (2)

(57) [Claims] 1. Two cable conductors which are integrally formed in advance from a rubber / plastic material and connected to a reinforcing insulator in which a high-voltage shield electrode and a conductor joint are arranged at the center of a through hole provided in the longitudinal direction. A conductor connector is provided at each of the distal ends, and a connector is provided for each of the conductor connectors. A conductor connector is inserted from both sides of a through hole of the reinforcing insulator, and the connectors are abutted. A method for connecting a power cable that obtains cable continuity by combining in a state where a conductor joint of a hole provided in the high-voltage shield electrode is fixed with a smaller diameter portion than the front and rear portions, An inner thread portion for locking the ring-shaped screw member is provided adjacent to the shoulder of the end portion, and a ridge or a ridge provided in the direction of inserting the conductor joint on the inner surface of the small diameter portion of the hole of the high voltage shield electrode. Groove The conductor joint to be inserted into the high-voltage shield electrode has a groove or a protrusion corresponding to the protrusion or the groove provided on the high-voltage shield electrode on the outer peripheral portion thereof, and a shoulder of a small diameter portion of the high-voltage shield electrode. In addition to providing a step portion for locking, in the combination of the concave groove and the ridge, a taper portion and / or an expanding portion are provided at the distal end of the ridge on the insertion side into the concave groove and the distal end of the concave groove on the insertion side. Using the formed one, a conductor joint is attached to the high-voltage shield electrode by combining the ridge and the concave groove, the step is locked to the shoulder, and a ring-shaped is formed in the through hole of the high-voltage shield electrode. The step of the conductor joint is pressed and fixed by attaching the screw member to the inner screw portion, and the conductor connectors provided at the ends of the two cable conductors to be connected are inserted and fixed. Power cable connection method. 2. An inner surface of a hole of the high-voltage shield electrode, wherein a protrusion is formed on an inner surface of the hole of the high-voltage shield electrode, and a groove formed on an outer periphery of the conductor joint is formed corresponding to the protrusion. Attach the conductor joint to the ridge provided in the groove, combine the conductor joint with the concave groove, position the conductor joint to the small diameter part of the hole of the high-voltage shield electrode, and make the conductor joint with a ring-shaped screw member. The power cable connection method according to claim 1, wherein the power cable is pressed and fixed inside the shield electrode.