KR20180054310A - Joint conductor connecting sleeve of integral structure for ultra high voltage power cable - Google Patents

Abstract

The present invention relates to a joint conductor sleeve for an integral structural high voltage power cable interface box. More specifically, the present invention relates to a joint conductor sleeve formed by integrally forming a corona shield and the joint conductor sleeve. According to the present invention, the joint conductor sleeve for an integral structural high voltage power cable interface box comprises: a cylindrical body; a conductor insertion unit having a power cable conductor inserted into the inside of the body; and one or more tap units passed from the body to the conductor insertion unit to have a screw tap to couple a shear bolt.

Description

TECHNICAL FIELD [0001] The present invention relates to a connector connecting sleeve for an ultra-high voltage power cable intermediate connector,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a conductor connecting sleeve for intermediate connection of an ultra-high voltage power cable, and more particularly to a conductor connecting sleeve in which a corona shield and a conductor connecting sleeve are integrally formed.

Power cables used for power transmission use underground power cables used in the transmission system, where power cables are used to connect them to each other.

A connection box used for connection between power cables is called an intermediate connection box, and a connection box connected to a power cable termination is called a termination connection port.

The middle junction box is used to connect the two cables so that the power cable can be energized by exposing the conductor of the power cable on both sides.

In order to prevent the insulation breakdown due to the energizing voltage in the state where the conductors on both sides of the power cable are connected by the conductor connection sleeve, various types of insulation are connected to the conductor.

A pre-mold connection box used as an intermediate connection box is used by preliminarily forming an insulating molded article called a "pre-mold" and coupling it to the electric field of the conductor connecting sleeve.

The conductor connection sleeves are formed in a circular shape, but they are compressed through a compression die to form an angled surface, which is then finely sandwiched by the sand paper so that there are no angles or corners. This is to prevent the electric field concentration by the ultra high voltage voltage as much as possible. However, even if the sanding process is carried out, the surface of the conductor connecting sleeve is not completely treated, so that the corona shield is connected to the connected conductor connecting sleeve.

Such a corona shield is a conductive layer (conductive layer) provided on the surface of a conductor connecting sleeve to prevent corona generation due to concentration of an electric field.

The corona shield used for connecting the ultra high-voltage power cable is disclosed in Korean Patent Laid-Open Publication No. 2003-0073416, a corona shield with a conductor connecting sleeve, and a corona shield of an ultra-high voltage power cable pre-mold connection box disclosed in Korean Patent No. 10-1566973 have.

Korean Patent No. 10-1566973 has a structure in which a conductor connecting sleeve and a corona shield are separately formed and connected to each other as a conventional method. However, this structure requires separate crimping to a conductor connecting sleeve for connecting cables, There is a problem in that efficiency is lowered due to on-site installation, time constraints and cost increase due to the purchase of the crimping equipment.

Korean Unexamined Patent Application Publication No. 2003-0073416 discloses a structure in which a conductor sleeve and a corona shield are integrally formed, or a structure in which a cable conductor is simply assembled, which can be easily released by the tension of both sides of an ultra-high voltage power cable, There is a problem that sufficient contact between the cable conductor and the conductor connecting sleeve is not achieved due to the presence of the gap.

Patent Document 1: Korean Patent No. 10-1566973 Patent Document 1: Korean Patent Publication No. 2003-0073416

SUMMARY OF THE INVENTION It is an object of the present invention to provide a conductor connecting sleeve of an intermediate connection box for connecting an ultra-high voltage power cable and an integral conductor connecting sleeve of a corona shield.

Further, there is no need for a separate compression device for compressing the conductor connecting sleeve by the conductor connecting sleeve and the corona shield integral structure, and it is possible to shorten the work process time and reduce the number of parts.

In order to accomplish the above object, the present invention provides a connector connecting sleeve for an ultra-high voltage power cable intermediate connection box, the connector having: a body having a cylindrical shape; a conductor insertion portion for inserting a power cable conductor into the body; And one or more tab portions having threaded tabs to penetrate from the body to the conductor insertion portion and to fasten the shear bolt.

Here, the conductor connecting sleeve includes an insulator insertion portion into which an insulator of the power cable can be inserted and inserted, and a fixing screw for fixing the insulator of the power cable to the conductor connecting sleeve when the insulator of the power cable is inserted. May be inserted into the screw insertion hole.

Here, the insulator of the power cable inserted into the insulator insertion portion may have an insulation jaw structure that is processed and its outer diameter is reduced.

Here, it is preferable that a plurality of the screw insertion portions are formed and arranged at an equal angle.

Here, the shear bolt includes a threaded portion and a rupture portion, and has a feature that the rupture portion shears at a predetermined torque or higher.

Here, the tab portion may be formed at an equal angle in the clockwise direction.

Here, the conductor connecting sleeve may have a symmetrical structure with respect to the longitudinal center line.

Here, the number of the tab portions and the number of the share bolts are preferably set in accordance with the rated allowable current capacity of the ultra-high voltage power cable.

The conductor connecting sleeve for the intermediate connector of the integrated type high-voltage power cable according to the present invention is cylindrical and has a symmetrical shape with respect to the longitudinal center line. The conductor connecting sleeve has a first inner groove for inserting the power cable conductor into the right and left sides, A plurality of tab portions penetrating from the outer circumference are formed in the first inner groove, and a plurality of tab portions penetrating from the outer circumference are formed, and the second inner groove is formed with a plurality of through- A plurality of screw insertion portions may be formed.

Here, a shear bolt is fastened to the tab portion, and the shear bolt is sheared at a predetermined torque or higher, and the distal end surface of the shear bolt contacts with the outer circumferential surface of the conductor of the ultra-high voltage power cable, Electrical contact can be made.

According to the above-described configuration, it is possible to provide the conductor connecting sleeve of the intermediate connection box connecting the ultra-high voltage power cable and the integral conductor connecting sleeve of the corona shield.

In addition, there is no need for a separate compression device to compress the conductor connecting sleeve by the conductor connecting sleeve and the corona shield integral structure, and it is possible to shorten the work process time because no compression process is required, The number of parts can be reduced.

1 is a schematic view of a connection structure using a conductor connecting sleeve for an integrated type high voltage power cable intermediate connection box according to the present invention.
2 is a perspective view of a conductor connecting sleeve for an integrated high voltage power cable intermediate connection box according to the present invention.
3 is a cross-sectional view of a conductor connecting sleeve for an integrated high voltage power cable intermediate connection box according to the present invention.
4 is a right side sectional view of a conductor connecting sleeve for an ultra-high voltage power cable intermediate connection box according to the present invention.
5 is a left side sectional view of a conductor connecting sleeve for an integrated high voltage power cable intermediate connection box according to the present invention.
6 is an exploded view of a conductor connecting sleeve according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a conductor connecting sleeve for an ultra-high voltage power cable intermediate connection box of an integral structure according to the present invention will be described in detail with reference to the drawings.

The detailed description of the specific embodiments shown in the accompanying drawings is read in conjunction with the accompanying drawings, which are considered a part of the description of the entire invention. The reference to direction or orientation is for convenience of description only and is not intended to limit the scope of the invention in any way.

Specifically, terms indicating positions such as "lower, upper, horizontal, vertical, upper, lower, upper, lower, upper, lower ", or their derivatives (e.g.," horizontally, Etc.) should be understood with reference to both the drawings and the associated description. In particular, such a peer is merely for convenience of description and does not require that the apparatus of the present invention be constructed or operated in a specific direction.

It should also be understood that the term " attached, attached, connected, connected, interconnected ", or the like, refers to a state in which the individual components are directly or indirectly attached, And it should be understood as a term that encompasses not only a movably attached, connected, fixed state but also a non-movable state.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a schematic view of a connection structure using a conductor connecting sleeve for an integrated type high voltage power cable intermediate connection box according to the present invention.

In general, an intermediate connection box of an ultra-high voltage power cable has various connection boxes according to an inner insulator and a connection method. In the present invention, it can be optimally applied to a pre-mold connection box connected by using an insulator called a preform. Therefore, in the following preferred embodiments, a pre-molded junction box is described as an example, but the present invention is not limited thereto.

1, a pre-mold connection box 10 according to the present invention comprises a pair of cables 11a and 11b each having conductors 12a and 12b, a pair of cables 11a and 11b A conductor connecting sleeve 14 for accommodating the conductors 12a and 12b respectively and a preform unit 15 provided outside the pair of cables 11a and 11b for insulating the pair of cables 11a and 11b And a protective pipe (not shown) for protecting the outside of the pre-molded unit 15 to protect it.

The pre-molded unit 15 may be made of an insulating material having elasticity. The insulating material may be any one selected from, for example, silicone rubber, Ethylene Propylene Rubber (EPR), and Ethylene Propylene Diene Monomer Can be used.

The pre-molded unit 15 implemented with an elastic insulating material is manufactured to have an inner diameter smaller than that of the insulators 13a and 13b of the power cables 11a and 11b and the insulators 13a and 13b of the power cables 11a and 11b 13b between the surface of the conductor connecting sleeve 14 including the surfaces of both ends of the insulators 13a and 13b of the power cables 11a and 11b and the inside diameter of the electrode portion 15a of the pre- The electrical characteristics of the preformed connection box 10 are improved because a constant pressure is generated at the interface to suppress the insertion of air, which is a cause of the corona discharge.

The power cables 11a and 11b are peeled so that the insulators 13a and 13b are exposed and both ends of the power cables 11a and 13b are removed from the insulators 13a and 13b so that the conductors 12a and 12b are exposed.

The exposed conductors 12a and 12b are inserted on both sides by the conductor connecting sleeve 14 and then connected to each other by a shear bolt 147 for electrical connection so as to make sufficient electrical contact. The number of shear bolts 147 can be adjusted so that sufficient electrical contact can be made, that is, to cover the allowable current.

The portions where the insulators 13a and 13b and the conductors 12a and 12b abut each other are bent so as to form a curvature as shown in the figure. The bent portion is then engaged by the fixing screw 14b after the conductor connecting sleeve 14 is engaged.

The fixed engagement of the fixing screw 14b with the insulation tab 13c of the insulator 13a prevents the gap between the conductor connecting sleeve 14 and the power cable insulator from spreading due to thermal expansion and contraction of the power cable .

Conventionally, a corona shield and a conductor sleeve are separately assembled, and a conductor sleeve and a conductor of a power cable are connected to each other, followed by compression and compression for mechanical coupling and electrical coupling. This conventional connection method has a problem in that the number of parts is increased and the parts cost is increased and the connecting process is very slow depending on the increase of the parts and the necessity of the compression equipments. However, the present invention is characterized in that the conductor sleeve and the corona shield are integrally It is possible to reduce the parts cost and simplify the work process.

FIG. 2 is a perspective view of a conductor connecting sleeve for an ultra-high voltage power cable intermediate connection case according to the present invention, FIG. 3 is a sectional view of a conductor connecting sleeve for an ultra- FIG. 5 is a left side sectional view of a conductor connecting sleeve for an ultra-high voltage power cable intermediate connection box according to the present invention, according to the present invention.

As shown in FIGS. 2 to 5, the conductor connecting sleeve 14 according to the present invention is made of a metal material having excellent conductivity, and is preferably made of a copper (Cu) material.

The conductor connecting sleeve 14 is designed as an integral type of a conventional conductor sleeve and a corona shield, and the left and right sides of the conductor connecting sleeve 14 may be symmetrical with respect to the vertical center line.

The conductor connecting sleeve 14 has a body 141 having a constant cylindrical shape and a conductor insertion portion 142 in which a power cable conductor is inserted and a shear bolt 147 A plurality of tabs 143 having screw tabs penetrating from the outside to the inside so as to be fastened to the power cable 14 and a gap between the conductor connecting sleeve 14 and the power cable insulator according to thermal expansion and contraction of the power cable, A screw inserting portion 144 into which a fixing screw 146 for fixing the conductor connecting sleeve 14 to the insulator is inserted and an insulator inserting portion 145 into which an insulator of the power cable can be inserted and processed have.

The outer diameter of the body 141 may have an outer diameter that matches the rated capacity of the power cable and the size of the inner diameter may be determined to match the outer diameter of the conductor insertion portion 142 and the rated capacity of the power cable.

The tab portion 143 extends from the outer side of the body 141 to the conductor inserting portion 142 and is formed with a screw tab so that the shear bolt 147 can be inserted along the screw tab.

The share bolt 147 is used to fix the inserted conductor when the conductor of the power cable is inserted into the conductor insertion portion 142 and to form a current path through electrical contact with the conductor of the power cable.

The shear bolt 147 may be composed of a head, a threaded portion and a ruptured portion. When a predetermined torque is applied, the ruptured portion is cut and discarded with the head, and only the threaded portion remains in the tab portion 143, ) And is used as a contact point for forming a current path with the power cable conductor.

The number of the share bolts 147 can be adjusted so as to match the current allowable capacity of the power cable, and at least one can be formed, and when the plurality of share bolts 147 are fastened, It is preferable that they are spaced apart from each other at equal intervals.

After the power cable is connected, the screw inserting portion 144 generates thermal expansion and contraction according to the temperature of the outside air at which the power cable is installed. At this time, the screw inserting portion 144 prevents the gap between the conductor connecting sleeve 14 and the power cable insulator from spreading.

A fixing screw 146 is inserted into the threaded inserting portion 144 to be fastened to the insulator (13c in Fig. 1) of the insulator (13a, 13b in Fig. 1) of the power cable inserted in the insulator inserting portion 145, (14) and the insulator of the power cable.

The number of the screw insertion portions 144 may be formed in at least two clockwise or counterclockwise directions at equal intervals.

Referring to FIGS. 4 and 5, a cross-sectional view in the left and right directions can be seen. Here, the cross-sectional view shows a cross section when cut in the direction passing through the center line of the tab portion 143 and the screw inserting portion 144.

Referring to FIG. 4, the cross-sectional shape passing through the longitudinal center line of the tab portions 143 of the conductor connecting sleeve 14 is viewed from the right side.

4 shows the state in which the shear bolt 147 is bolted and is inserted without being sheared. In the right side view of Fig. 4, the tip portion (threaded portion) of the share bolt 147 is connected to the conductors 12a, A certain torque is generated and the broken portion is cut off.

In the present invention, the number of the share bolts 147 is ten (10) fastened (fastened at intervals of 36 degrees) on the left and right sides with respect to the longitudinal center line of the conductor connecting sleeve 14, It is possible to calculate and set the amount of current that the current path can be formed in consideration of the current.

The outermost strands of the associated strands constituting the conductor of the power cable physically come in contact with the inner surface of the conductor connecting sleeve 14 and furthermore the contact area between the shear bolts 147 and the strands of the power cable The current path connecting the conductors 12a and 12b, the conductor connecting sleeve 14 and the share bolt 147 of the power cable can be formed.

5 is a cross-sectional view of the conductor connecting sleeve 14 taken along a line passing through the longitudinal center line of the threaded inserting portion 144, as viewed from the left side.

In the present invention, an example in which the screw inserting portion 144 is formed at intervals of 60 degrees will be described, and it is natural that the number of the screw inserting portions 144 can be reduced or increased as necessary.

The screw inserting portion 144 is preferably formed at the same position on the left and right ends of the conductor connecting sleeve 14 at an equal angle with the fixing screw 146 and the insulator 13a, 13b can be connected to each other.

6 is an exploded view of a conductor connecting sleeve according to the present invention.

FIG. 6 is a diagram of a conductor connecting sleeve 14 having a length of 1/2 with respect to a longitudinal center line. FIG. 6 is a more specific view of the arrangement of the tab portion 143.

As shown in the figure, the conductor connecting sleeve 14 is a developed view in which the longitudinal side shows the length / 2 of the conductor connecting sleeve 14 and the transverse side shows the circumferential length, and ten tab portions 143, and when the developed view is cylindrical, the ten tab portions 143 may be arranged to be equally spaced from each other clockwise or counterclockwise.

The equal spacing (or isometric) arrangement of the tab portions 143 induces an equal distribution of forces that can evenly contact the conductors of the power cable, and evenly distributes the electrical contacts, So as to facilitate mechanical and electrical coupling of the cable conductors 12a and 12b and to ensure safety.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Various modifications and variations are possible within the scope of the claims and the claims.

It is evident, however, that such simple modifications and variations are not to be regarded as a departure from the scope of the present invention.

10: Pre-mold connection box 11a, 11b: Cable
12a, 12b: conductors 13a, 13b: insulator
13c: Insulation chin 14: Conductor connection sleeve
15: pre-mold unit 15a: electrode unit
141: body 142: conductor insertion portion
143: tab portion 144: screw insertion portion
145: insulator insertion part 146: fixing screw
147: Shear bolt

Claims (10)

A body having a cylindrical shape,
A conductor insertion portion into which the power cable conductor is inserted into the body,
And at least one tab portion having threaded tabs penetrating from the body to the conductor insertion portion and fastening a shear bolt. The connector connection sleeve for an ultra-high voltage power cable intermediate connection case of an integral structure. The method according to claim 1,
The conductor connection sleeve includes:
An insulator insertion portion into which an insulator of the power cable can be processed and inserted,
Further comprising at least one screw insertion portion into which a fixing screw for fixing the insulator of the power cable and the conductor connection sleeve is inserted when the insulator of the power cable is inserted, . 3. The method of claim 2,
Wherein the insulator of the power cable inserted into the insulator insertion portion is an insulated jig that is processed and reduced in outer diameter. 3. The method of claim 2,
Wherein a plurality of the screw insertion portions are formed and are disposed at an equal angle. The method according to claim 1,
Wherein the shear bolt includes a threaded portion and a rupture portion, and the rupture portion is sheared at a predetermined torque or higher. The method according to claim 1,
Wherein the tab portion is formed at an equal angle in the clockwise direction. The method according to claim 1,
Wherein the conductor connecting sleeve has a symmetrical structure with respect to a longitudinal center line. The method according to claim 1,
Wherein the number of the tab portions and the number of the share bolts are set in accordance with the rated allowable current capacity of the ultra high-voltage power cable. Shaped, symmetrical with respect to the longitudinal center line,
The left and right sides have a first inner groove for inserting the power cable conductor,
And a second inner groove having a diameter larger than that of the first inner groove and having an insulator of the power cable inserted therein,
Wherein the first inner groove is formed with a plurality of tab portions penetrating from the outer periphery,
And the second inner groove is provided with a plurality of screw insertion portions penetrating from the outer periphery. 10. The method of claim 9,
And a shear bolt is fastened to the tab portion, and the shear bolt is sheared at a predetermined torque or higher, and the distal end surface of the shear bolt contacts the outer circumferential surface of the conductor of the ultra-high-voltage power cable. Conductor connection sleeve for power cable intermediate connector.

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