JP3247008B2 - Power cable conductor connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for connecting a cable conductor at an intermediate connection portion or the like of a power cable.
A conductor connector fixed and arranged at the tip of the cable conductor is inserted into a conductor joint to obtain electrical continuity,
The present invention relates to a conductor connecting device for a power cable, which is provided with a mechanism for interconnecting the conductor connectors using a locking means disposed at a tip portion of the conductor connector.

[0002]

2. Description of the Related Art In order to connect a large-capacity power cable such as a CV cable, a slip-on type conductor connecting means has conventionally been used. Technical means disclosed in Japanese Unexamined Patent Publication No. 2-155415 and Japanese Unexamined Utility Model Publication No. 2-77868 are known. In the cable connecting means as described above, 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 connected to the copper conductor joint. The cable is inserted in a state where the cable is opposed to each other so as to obtain the continuity of the cable.
Further, by forming a cable connection portion as shown in the conventional example, when covering the periphery with an insulating member, by casting a rubber plastic material corresponding to the connection portion, or by performing tape winding. Forming a reinforced insulator.

As described above, when a reinforcing insulator is formed on site, it is formed using, for example, an apparatus described in Japanese Patent Application Laid-Open No. 5-174936. However, casting a plastic material at the cable connection site requires a long working time, and requires the installation of a clean room to prevent foreign materials from entering the plastic material. The problem exists. Similarly, wrap the rubber tape,
In the case of forming the reinforcing insulator, it is necessary to bring a tape winding machine or the like to the site, which complicates the operation. Therefore, as described above, in order to solve the problem of forming a reinforcing insulator at a manhole or the like at a cable connection site, for example, as shown in Japanese Utility Model Publication No. 3-841 or the like, a factory It has been proposed to use manufactured reinforcing insulators. In addition, by configuring the cable connection portion using the existing reinforcing insulator, the operation of connecting the cable can be greatly simplified, and the reliability of the cable connection portion can be improved.

[0004] A cable connecting portion configured to insert a conductor connector provided at the distal end of a cable conductor from both sides into the existing reinforcing insulator so as to obtain electrical conduction through a conductor joint, It is configured as shown in FIG. The cable connecting portion 20 shown in FIG. 6 has conductor connectors 7 and 7a integrated with the ends of the conductors 2 and 2a of the two cables 1 and 1a, respectively, as in the case of the conventional cable connecting portion. Provided. Then, the conductor connectors 7, 7a are inserted into the cylindrical conductor joint 10 to constitute a means for setting the conductive state of the conductors via the cylindrical conductor joint. In the cable connection portion 20, the cylindrical conductor joint 10
The high-voltage shield electrode 15 is disposed at a position corresponding to the above, and a reinforcing insulator 16 integrally formed in a cone shape with a predetermined length is disposed around the high-voltage shield electrode 15. The reinforcing insulator 16 is configured as a pre-molded body formed of a rubber elastic body such as ethylene propylene.

[0005] Then, a shielding layer 21 is disposed around the reinforcing insulator 16, a waterproof mixture 22 is formed at a predetermined thickness on the outer periphery thereof, and a metal protective tube is formed on the outer periphery of the waterproof mixture 22. 23 is arranged. In addition, the insulating tube 24 is arranged at a predetermined position in the insulating connection portion with respect to the protective tube 23, and a terminal seat 25 is arranged with respect to the protective tube, and means for connecting to the ground is provided. Further, a waterproof layer 26 is disposed so as to cover both ends of the insulating tube 24 and a connection portion between the cable sheath and constitutes means for preventing moisture and the like from entering the inside of the protective tube 23. Although the cable of the present invention is configured as having a corrugated exterior, the cable connection portion can be configured for any CV cable for high-voltage power transmission.

[0006] In the case of forming the above-described cable connection portion, the outer diameter φA becomes relatively large, and when connecting three cables inside the manhole of the connection portion, the first connection is made. There is a problem that the connecting portion obstructs a later forming operation of the connecting portion, and there is a demand for downsizing. However, in order to reduce the size of the connection,
Although it is conceivable to make the conductor joint and the like thinner to reduce the size, there is a problem that the electric capacity of the conductor joint decreases and the mechanical strength decreases.

Therefore, in order to reduce the volume occupied by the waterproof admixture and the like disposed around the reinforcing insulator, as shown in FIG. It has been proposed to construct
In the connection portion 20a shown in FIG. 7, each member for connecting the cable conductor is configured as the same as the device of FIG. 6, but the outer surface of the protective layer 27 provided on the surface of the reinforcing insulator 16 is formed. An outer protective member 28, for example, a shrink tube, similar to the protective tube or the like is disposed, and the protective member is heated and shrunk so as to adhere to the surface of the protective layer. With the configuration as described above, the outer protective member 27 is provided on the outer surface of the protective layer 27 provided on the surface portion of the reinforcing insulator 16 by a shrinkable tube that exhibits the same action as a protective tube or the like.
Each component can be formed integrally. In addition, it is possible to obtain the same insulation characteristics and strength of the connection portion as the connection portion shown in FIG. 6, and to reduce the outer diameter φB of the connection portion, thereby improving the efficiency of the connection portion forming operation. You can do it.

[0008]

In the above-mentioned cable connecting portion, connecting means as shown in FIG. 8 are provided to mount and fix and hold the conductor connectors from both sides of the conductor joint. I have. In the connecting means shown in FIG. 8, the conductor connectors 7, 7a fixed to the distal ends of the cable conductors 2, 2a have step portions 9, 8 on the heads 8, 8a.
9a are provided respectively. Also, steps 11 and 11a are formed on both sides in the length direction on the inner surface of the conductor joint 10, respectively, so that the steps of the conductor connector can be locked and held. The conductor joint 10 is formed by combining a large number of strip-shaped copper rod members into a cylindrical shape, maintaining the cylindrical shape by springs 12 arranged on the outer peripheral portion thereof, and inserting the head of the conductor connector. Expand the cylinder,
It is configured such that it can be tightened and fixed in a state where the steps of both members are engaged.

However, in the case where a mechanism such as the above-mentioned conductor joint is formed so as to be able to expand outward when the head of the conductor connector is inserted, the conductor joint and the high-pressure shield disposed outside the joint are provided. Since it is necessary to form a large gap between the electrode and the electrode, a mechanism for maintaining an electrically conductive state between the conductor joint and the high-voltage shield electrode is required. In addition, when the conductor connector is inserted into the conductor joint, it cannot be inserted unless the conductor joint has play, and the inserted cable reinforcement insulator may shift, which may affect the insulation performance. Occurs. Therefore, when a tensile force is applied in the length direction of the cable, there is a problem that the connection state cannot be accurately maintained. In addition, if the conductor joint does not accurately hold the conductor connector, the cable conductor may not be properly fixed and held at the connection portion, which may cause a problem in the performance of the feeder line. I am concerned.

In addition to the above problems, when the conductor joint is formed by arranging a plurality of strip-shaped members, each member does not come into contact with the conductor connector accurately, and the members constituting the conductor joint are not provided. Is configured as having a large current carrying capacity,
An increase in the outer diameter of the conductor joint cannot be avoided. Therefore, in order to configure the inner diameter of the high-voltage shield electrode corresponding to the outer diameter of the conductor joint, an auxiliary member is separately provided in order to set the electrical conduction between the conductor joint and the high-voltage shield electrode. There is a problem that the combination mechanism of the conductor joint and the high-voltage shield electrode becomes complicated due to the necessity of the provision and the like.

[0011]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problem in forming a cable connecting portion by connecting conductor connectors arranged at the conductor tip using a connecting member. In addition, to provide a device that can effectively exert the effect of fixing and holding the conductor connector to the conductor joint even when a pulling force acts on the cable, and to simplify the configuration of the conductor joint, It is an object of the present invention to provide a conductor connecting device for a power cable that can accurately maintain electrical conduction performance and reduce the outer diameter of a connecting portion.

[0012]

According to the present invention, a conductor connector is fixed to each of the distal ends of two cable conductors, and the distal ends of the conductor connectors are inserted into and fixed to a conductor joint. The present invention relates to a connection device configured to obtain electrical continuity of a cable conductor connected through the connection device. In the present invention, the engaging side connecting member is disposed at the distal end of the conductor connector disposed at the distal end of one cable, and the insertion side connecting member is disposed at the distal end of the other conductor connector. Means for connecting the two conductor connectors to each other in a state where the insertion-side connection member is inserted into the stop-side connection member, and a conductor for inserting the two conductor connectors to obtain electrical continuity; Fittings,
A band-shaped conductive member is disposed on the inner surface of a cylindrical metal member having conductivity, and conduction between a conductor connector and a conductor joint is set via the band-shaped conductive member, and the conductor joint is reinforced and insulated. This constitutes means for fixedly holding the high-voltage shield electrode provided on the body. In the present invention,
The one conductor connector to be inserted into the conductor joint is provided with a locking side connection member protruding at a distal end portion, and a tapered guide groove is arranged in a housing portion provided in the main body portion, Is provided with a step for locking the wing member of the insertion-side connection member, and the insertion-side connection member disposed at the tip of the other conductor connector inserted into the conductor joint has an insertion pin protruding at the tip thereof. The wing member is provided so as to protrude from a side portion of the insertion pin, and a spring for urging the insertion pin in a protruding direction is arranged. Then, a pin member protruding from the tip member of one conductor connector is locked in the groove provided in the conductor joint to position one conductor connector, and then the other conductor is positioned. By inserting the connector and engaging the locking side connection member and the insertion side connection member, the connection portion can be configured.

[0013]

In the cable connecting portion of the present invention constructed as described above, when the conductor connector is inserted from both sides into the conductor joint, a conductive state by the band-shaped conductive member is set between the conductor joint and the conductor connector. Therefore, even if there is a difference between the inner diameter of the conductor joint and the outer diameter of the conductor connector, it is possible to accurately set the conduction state between the two conductor connectors via the conductor joint. Further, when the conductor connector is inserted into the conductor joint from both sides, the locking means disposed at the distal ends of the two conductor connectors exert an effect of locking and holding each other. Even when a pulling force is applied in the vertical direction, the two conductor connectors do not separate from each other, so that a reliable locking and holding state can be maintained. Further, the locking means of the conductor connector of the present invention is configured by arranging a locking side connection member for one conductor connector and arranging an insertion side connection member for the other conductor connector. In addition, by inserting the insertion-side connecting member into the locking-side connecting member, it is possible to reliably maintain the locked state of both members.
Therefore, in the connecting portion of the present invention, it is not necessary to provide a space for expanding the conductor joint inside the high-voltage shield electrode, and the outer shape of the connecting portion is not configured as having an extra size, and the The structure can be reduced in size.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a power cable conductor connecting device according to the present invention. In the example shown in FIG. 1, similarly to the cases of FIGS. 6 and 7, the conductor connectors fixed to the end portions of the cable conductors are inserted into the conductor joints, and the reinforcing insulator is arranged around the conductor joints. Further, a connection structure of a cable conductor when an insulating member is arranged on an outer peripheral portion of a reinforcing insulator to form a cable connection portion is shown. The embodiment shown in FIG. 1 shows a configuration in which a conductor connector is inserted into a conductor joint to conduct electricity through the conductor joint.
Members that perform the same function are given the same names as in the conventional example.

The conductor connectors 35 and 36 of the present invention are fixedly held at the distal ends of the conductors 31 and 31a of the cables 30 and 30a, respectively. The fixed state of the cable is set by locking the locking-side connecting member 40 and the insertion-side connecting member 50 arranged in the portion. Further, the conductor connectors 35, 36
Is inserted into the conductor joint 60, and the conductor joint 60
The conductive state between the conductor connector and the conductor joint can be set via band-shaped conductive members 61 arranged on the inner surface of the conductor. Further, the conductor joint 60 according to the present invention has a structure in which the high voltage shield electrode 66 of the reinforcing insulator located outside thereof is
It is attached integrally via a connection member 65,
When the reinforcing insulator is manufactured by casting a rubber plastic material, a combination of a high-voltage shield electrode and a conductor joint can be integrally molded in a state embedded in the reinforcing insulator.

The conductor connector 35 provided at the distal end of the cable conductor 31 has a screw hole 37 at the distal end, and a locking connection member 40 is attached to the screw hole 37. The conductor connector 36 attached to the distal end of the other cable conductor 31a is provided with a screw hole 38 to insert the connecting member 5 on the insertion side.
By inserting the insertion pin 54 protruding from the distal end of the insertion-side connection member 50 into the engagement-side connection member 40, both members can be fixed. In addition to the above-described configuration, a positioning pin 63 is provided so as to protrude from an outer peripheral portion of one of the conductor connectors. Positioning with respect to the joint can be performed.

In the connecting portion constructed as described above, the conductor joint 60 is constructed as shown in FIG. 2, and the inner surface of the copper-made cylindrical conductor joint 60 has a conductor connection inserted therein. The same number of band-shaped conductive members 61... As the band-shaped conductive member, for example, “Multi Contact Band” (trade name) manufactured by Salton Co., Ltd. can be used. The multi-contact band is formed by forming a large number of cut-and-raised pieces at predetermined intervals at a central portion, leaving a narrow portion on both sides, for a thin belt-shaped plate member made of a copper alloy. I have. Then, the cut-and-raised pieces are tilted to one side while being compressed by the pressing members on both sides, and are pressed against the members on both sides by the elasticity of the band, so that electrical conduction can be obtained. .

In the multi-contact band, the circumferential length of the band and the interval between the cut-and-raised pieces can be set arbitrarily. The cut-and-raised piece is formed at the center in the width direction of one thin plate. In the case of processing in a cut-and-raised state, the current carrying capacity of one cut-and-raised piece can be set to about 30A. Therefore, for example, even when a current of several hundred to several thousand A flows in a high-voltage transmission line, it is possible to sufficiently cope with the case by making the circumferential length of the multi-contact band correspond to the number of cut and raised pieces. become. Further, the conductor joint 60 of the present invention
Then, the shape of the groove member for mounting the band-shaped conductive member and the means for preventing the band-shaped conductive member from coming off can be arbitrarily configured.

In the conductor connector inserted into the conductor joint 60 shown in FIG. 1, the locking-side connection member 40 mounted on one conductor connector 35 is configured as shown in FIG. The locking side connecting member 40 is configured to insert a screw portion 41 provided at a rear end portion of a cylindrical main body portion 42 into a screw hole provided at a tip end portion of a conductor connector and fix the same. The guide groove 43 is arranged obliquely from the front end to the accommodating portion 45 provided inside. Further, a projection acting as a locking portion is provided on the tip end side of the guide groove 43,
When the insertion pin of the insertion-side connection member is inserted, the wing member provided on the insertion pin is locked by the projection, so that both members can be fixedly held. The locking side connection member 4
Guide groove 4 formed from the leading end of container 0 toward accommodation portion 45
A slanted wing member guiding means is formed in a deep portion formed in a tapered front end side, guides the insertion pin while twisting the insertion pin, and guides the guide groove 43 from the insertion hole 44 toward the accommodation portion 45.
Are configured to communicate with each other.

The insertion-side connecting member 50 disposed at the distal end of the other conductor connector 36 so as to face the locking-side connecting member 40 shown in FIG. 3 has a configuration as shown in FIG. The screw portion 51 is arranged at the rear end of the main body 52, and an insertion pin 54 provided with a wing member 55 is provided at the front end of the main body so as to protrude. Further, the inside of the main body 52 of the insertion-side connecting member 50 is configured as a hollow accommodation portion 53, and a spring 57 disposed inside the accommodation portion 53 causes
The stopper plate 56 provided at the rear of the insertion pin 54 is pressed. When the action of twisting the insertion pin 54 is applied in a state where the stopper plate of the insertion pin is pressed by the spring 57, after the action is released, the insertion pin is moved by the reaction force of the spring. Perform the action of returning to the original position,
The positioning operation for the wing member 55 provided on the insertion pin can be performed.

In the state where the two members shown in FIGS. 3 and 4 are combined, as shown in FIG. 5, it is provided on the insertion pin 54 of the insertion side connection member 50 with respect to the locking side connection member 40. The wing members 55 are locked so that they can be held in an inseparable state. As shown in FIG. 1, the conductor connector 36 is inserted into the conductor joint 60, and the positioning pin 63 arranged on the outer peripheral portion of the conductor connector is inserted into the groove 6 of the conductor joint.
4, the conductor connector 36 is positioned, and then the conductor connector 35 is inserted from the other side of the conductor joint 60. Then, when the conductor connector 35 is inserted from the other side of the conductor joint toward the conductor connector 36 fixed and held first with respect to the conductor joint, the conductor connector 35 is inserted into a predetermined depth. Thus, the insertion pin 54 of the insertion-side connection member 50 provided on the conductor connector 35 corresponds to the concave portion at the tip of the locking-side connection member 40, and is further provided on the insertion pin 54 by inserting the conductor connector 35. The inserted wing member 55 is guided by the guide groove 43 and inserted with a twisting action.

As described above, the locking side connecting member 40
Is pressed toward the insertion-side connection member 50, so that the main body of the insertion-side connection member 50 can be inserted into the recess including the guide groove 43 disposed at the distal end of the main body 42 of the locking-side connection member. The protrusions provided at the distal end of the portion 52 are engaged, and the two members are connected. In this state, the wing member 55 of the insertion pin 54 provided on the insertion-side connecting member 50 enters the housing portion 45 of the locking-side connecting member 40, and the regulation by the guide groove is released. Due to the accumulated reaction force, the insertion pin rotates by the rotated angle. Then, a step 46 disposed on the distal end side of the storage section
, And the locking side connection member 40 and the insertion side connection member 50 are connected as an integral unit. Therefore, as shown in FIG. 5, in a state where both members are integrally connected, the state of the connection portion is maintained even when a tensile force is applied to the conductor connector supporting each member. Can be.

In the conductor connecting apparatus for a power cable according to the present invention, by inserting the conductor connector into the conductor joint and connecting the cable connector, the cable conductors disposed on both sides of the cable connection portion are opposed to each other. By connecting the locking side connection member and the insertion side connection member provided at the distal end, a strong mechanical connection structure can be obtained. In addition, since the electrical connection between the two conductor connectors and the conductor joint can be made via a band-shaped conductive member provided on the inner surface of the conductor joint, the electric connection between the outer diameter of the conductor connector and the inner diameter of the conductor joint is made. Therefore, a relatively large gap can be formed, and the operation of inserting the conductor connector into the conductor joint can be easily performed. further,
Between the two cylindrical members of the conductor joint and the high-voltage shield electrode, an electric connection means is formed via a connection member. As described above, it is not necessary to strictly set the configuration for setting the electrical conduction state. When the reinforcing insulator of the present invention is molded, the conductor joint and the high-voltage shield electrode can be integrally incorporated so that the reinforcing insulator can be formed at the site where the cable connection work is performed. There is no need to form them, and it is possible to easily perform the assembling work of the cable connecting portion.

When the cable connecting member constructed as described above is used, the cable connecting member can be applied to the connecting portion as shown in FIGS. 6 and 7, and the conductor connecting member as shown in FIG. Compared with the connection structure of the child, it is possible to eliminate the need for play in the conductor joint and to simplify the configuration of the connection portion. Further, when the connection structure of the cable conductor of the present invention is configured as a connection member provided with a covering with a shrink tape as shown in FIG. 7, it is possible to reduce the size in comparison with a conventional cable connection portion. This makes it possible to improve the efficiency of connecting cables to a narrow place such as a manhole.

[0025]

According to the power cable conductor connecting device of the present invention, when the conductor connector is inserted into the conductor joint from both sides by the above-described configuration, a band-like portion is formed between the conductor joint and the conductor connector. The conduction state by the conductive member can be set. Then, even if there is a difference between the inner diameter of the conductor joint and the outer diameter of the conductor connector, the conduction state via the conductor joint between the two conductor connectors can be accurately set. Also,
When the conductor connector is inserted from both sides into the conductor joint,
The locking means disposed at the tip of the two conductor connectors includes:
Since they exert the function of locking and holding each other, even when a pulling force is applied in the length direction of the cable, the two conductor connectors do not separate from each other, and a reliable locking and holding state can be maintained. it can. Further, the locking means of the conductor connector of the present invention is configured by arranging a locking side connection member for one conductor connector and arranging an insertion side connection member for the other conductor connector. In addition, by inserting the insertion-side connecting member into the locking-side connecting member, it is possible to reliably maintain the locked state of both members. Therefore, in the connecting portion of the present invention, it is not necessary to provide a space for expanding the conductor joint inside the high-voltage shield electrode, and the outer shape of the connecting portion is not configured as having an extra size, and the The structure can be reduced in size.

Furthermore, when the reinforcing insulator of the present invention is formed, the conductor joint and the high-voltage shield electrode can be integrally incorporated so that the reinforcing insulator can be used at a site where a cable connection operation is performed. Need not be formed on site, and the cable connecting portion can be easily assembled. In the connection structure according to the present invention, the conductor joint has no play compared to the conventional connection structure of the assembled cable conductor, so that the shape of the connection portion can be reduced and simplified. Therefore, by applying the structure of the connecting portion of the present invention, it is possible to make the device smaller than a conventional cable connecting portion, and to connect to the cable in a narrow place such as a manhole. Work efficiency in performing work can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a conductor connecting portion of the present invention.

FIG. 2 is an explanatory view showing a configuration of a band-shaped conductive member arranged on an inner surface of the conductor joint of the present invention.

FIG. 3 is a perspective view showing a configuration of a locking side connection member of the present invention.

FIG. 4 is a perspective view showing a configuration of an insertion-side connecting member of the present invention.

FIG. 5 is an explanatory view of a state in which a locking side connection member and an insertion side connection member are combined.

FIG. 6 is a cross-sectional view illustrating a configuration of a conventional cable connection unit.

FIG. 7 is a cross-sectional view showing the configuration of another example of a conventional cable connection portion.

FIG. 8 is an explanatory view of a state where a conductor connector is inserted into a conventional conductor joint and fixed.

[Explanation of symbols]

1 cable, 2 conductors, 7 conductor connector,
10 Conductor joint, 15 High voltage shield electrode, 16
Reinforced insulator, 20 Cable connection, 27
Protective layer, 30 cable, 35/36 conductor connector, 37/38 screw hole, 40 locking side connection member, 43 guide groove, 45 housing part, 50
Insertion side connection member, 54 Insertion pin, 55 Wing member, 57 Spring, 60 Conductor joint, 61
Band-shaped conductive member, 63 positioning pin, 65
Connection member, 66 High voltage shield electrode.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 15/08 H02G 1/14

Claims (2)

(57) [Claims] 1. A conductor connector is fixed to each of the distal ends of two cable conductors, and the distal ends of the conductor connectors are inserted into and fixed to a conductor joint. In a connection device configured to obtain electrical continuity, a locking connection member is disposed at a distal end of a conductor connector disposed at a distal end of one cable, and inserted into a distal end of the other conductor connector. A means for connecting the two conductor connectors to each other in a state where the side connection member is arranged and the insertion side connection member is inserted into the locking side connection member, and wherein the two conductor connectors are inserted; Conductor joints for obtaining electrical continuity, a band-shaped conductive member is disposed on the inner surface of a cylindrical metal member having conductivity, and between the conductor connector and the conductor joint via the band-shaped conductive member. Set the continuity and connect the conductor joint Conductor connecting device for a power cable, characterized in that to fix the holding to the high-voltage shielding electrode provided on strong insulator. 2. One of the conductor connectors to be inserted into the conductor joint is provided with a locking-side connecting member protruding at a distal end thereof, and a tapered guide groove is disposed in a receiving portion provided in the main body. A step for locking the wing member of the insertion-side connection member is provided in the housing portion; an insertion-side connection member is disposed at a tip end of the other conductor connector inserted into the conductor joint; A projection is provided on the side of the insertion pin, and a wing member is provided on the side of the insertion pin, and a spring for urging the insertion pin in the projection direction is disposed. A pin member protruding from a tip member of one conductor connector is locked to position one conductor connector, and thereafter, the other conductor connector is inserted to be inserted into the locking side connection member. By forming the connection portion by engaging the side connection member, Conductor connecting device for a power cable according to claim 1, symptoms.