KR101435932B1 - Connector for connecting electric power distribution cable in underground - Google Patents

Abstract

The present invention relates to a connector for connecting a power distribution board of an underground distribution line. The connector for connecting the power distribution board of the underground distribution line according to the embodiment of the present invention excludes a connection failure and damage due to arc by quickly extinguishing the arc even through the arc is generated between the connector and the underground distribution line and prevents a fire or an electric shock due to an electric leakage by securely insulating and waterproofing a connection part.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a connector for connecting an underground distribution line to an electric distribution board,

More particularly, the present invention relates to a connector for connecting an underground distribution line to an underground distribution line, and more particularly to a connector for connecting an underground distribution line to an underground distribution line, The present invention relates to a connector for connecting an underground power distribution line to an electric power distribution board,

Electricity generated at a voltage of about 20,000V is boosted to ultra high voltage (154 KV or 345 KV) suitable for transmission in a power plant including a thermal power plant, a hydroelectric power plant and a nuclear power plant. The boosted electricity is supplied to a primary substation Is transmitted.

The primary substation downconverts the super-high voltage electricity to 22.9 KV, which is the special high voltage, to transmit or distribute to each general customer along a secondary substation or distribution line located near a large capacity customer.

The electricity distributed from the primary substation or the secondary substation is transmitted or distributed to the reception facilities of each customer through the transmission and distribution system composed of the processing distribution line and the underground distribution line. The electricity is distributed to the customer through the special high pressure customer, the high pressure customer and various outdoor installation transformers. It is used for industrial and domestic purposes.

There is a way of using the ground and using the ground.

In the transmission and distribution system using the ground, the underground pipe is installed in the underground, and the underground cable for transmitting or distributing the extra high voltage is disposed in the underground pipe.

The underground pipe should be installed at a certain depth and should be kept at a constant distance from other adjacent underground pipes when many underground pipes are installed.

In the prior art, sand was poured at a predetermined height into a lower part of the ground excavated at a predetermined depth using a wood plywood, and an underground pipe was disposed. The spacing of the underground pipes was maintained constant using a spacer, Therefore, the arrangement of the underground pipe is completed.

When the installation of the underground pipe is completed, the wooden plywood and the spacer are removed, and the rebuilding is completed.

However, this conventional technique makes it difficult to maintain the installed position of the installed underground pipe structure in case of inclination or groundwater leaching.

As a prior art for solving such problems, Korean Patent Laid-open No. 10-2011-012279 (published on November 10, 2011) discloses a "prefabricated power socket connection device for underground transmission and distribution" (prior art 1).

The above-mentioned prior art 1 high-voltage electric power distribution ground wire connection device includes a built-in power hole block for underground transmission and distribution and a plurality of projection plate sealing portions.

The assembled power bulb block for underground transmission and distribution is standardized and mass-produced at the factory, and is usually made to a size that can be worked by the wiring worker.

The protruding plate sealing member has a double structure having an outer layer sealing portion formed of a resin expanding material and an inner layer sealing portion formed of a natural rubber material while the outer layer sealing portion has an integral plate extending in both sides in a longitudinal direction, And is fitted and fixed in the space of the joint portion.

A protruding plate sealing member is inserted into a plurality of spaces formed between the assembled power block for underground transmission and distribution and the assembled power block for underground transmission and distribution.

The assembled power block for underground transmission and distribution and the assembled power block for underground transmission and distribution where the protrusion plate sealing member is inserted are fastened with bolts or wires.

This prior art 1 has an advantage in that it does not leak to the inside of the underground wire fixing device for special high-voltage electric power transmission and distribution, and the size of the inner cavity can be increased.

However, the prior art 1 has a problem in that it can not provide a structure of a bracket which can be electrically connected to an underground electric wire for special high-voltage electric power distribution and can be mechanically fixed.

Therefore, it is necessary to develop a technology to electrically connect and fix the underground wire for special high voltage electric power distribution at the same time mechanically.

As a prior art according to this necessity, a "distribution ground wire connection bracket" (prior art 2) is disclosed in Korean Patent Registration No. 10-1178224 (registered on August 23, 2012).

The above-mentioned "distribution ground wire connection bracket" of the above-mentioned prior art 2 is characterized in that a special high-voltage distribution special high-voltage cable is inserted into a seating portion formed with both fences, And a lower end bracket portion which is electrically connected to the upper end bracket portion and a lower end bracket portion which are hingedly connected to one end portion of the lower end bracket portion by a hinge shaft rod and are rotated about the hinge shaft rod to be superposed on the upper side surface of the lower end bracket portion, And a top bracket portion that is electrically connected to the conductor of the extra high voltage cable which is seated on the mounting portion and is mechanically fixed by contacting with a plurality of top projections, To prevent electric leakage, discharge, and electric shock, and to mechanically So as to prevent the occurrence of unexpected breakage and to avoid urgent maintenance.

However, in the prior art 2, both ends of the both side cables for connecting to each other are inserted between the upper projection formed in a conical shape in the upper bracket and the lower projection formed in a conical shape in the lower bracket, and the conical upper projection and the lower projection are brought into contact with both ends of the both side cables Since the upper and lower protrusions connecting the two cables and the upper and lower brackets are exposed to the atmosphere, an arc is generated between the cable and the upper and lower protrusions and the upper and lower brackets. And thus, there is a problem that connection failure and damage are caused at the connection site.

In addition, since the upper and lower protrusions and the upper and lower brackets are exposed in the atmosphere, a short circuit is generated, resulting in a fire or an electric shock.

Therefore, even if an arc is generated between the connector and the underground distribution line, it can be quickly extinguished so that connection failure and damage due to the arc can be eliminated. In addition, it is possible to prevent a fire or an electric shock accident caused by a short circuit, It is necessary to develop.

Korean Patent Laid-Open No. 10-2011-012279 (published on November 10, 2011) discloses a " Korean Registered Patent No. 10-1178224 (registered on March 23, 2012), "Distribution ground wire connection bracket"

Accordingly, it is an object of the present invention to provide a connector and an underground distribution line that can be quickly extinguished even when an arc is generated between the connector and an underground distribution line, so that connection failure and damage due to arcing can be eliminated, Or to prevent an electric shock accident.

In order to achieve the above object, according to the present invention, there is provided a connector for connecting an underground distribution line to an underground distribution line connected to an underground distribution power line buried in the ground,

The connector includes an upper contact portion formed in a hollow shape so as to allow the underground distribution line to penetrate therethrough and having a plurality of upper contact protrusions protruded downward on the inner circumferential surface to be in pressing contact with the underground distribution lines, An upper tapered portion having a tapered outer circumferential surface, and an upper connection port made of a conductive material having a fastening screw portion formed outwardly from the upper taper portion and formed in a hollow shape and having a male screw portion on an outer circumferential surface; A lower contact portion formed in a hollow form so as to allow the underground distribution line to penetrate and having a plurality of lower contact protrusions formed upwardly protruding from the inner circumferential surface so as to be in pressure contact with both side underground distribution lines; An upper connection port made of a conductive material having a lower tapered portion having a tapered outer peripheral surface and a tightening screw portion formed outwardly from the lower tapered portion and formed as a hollow and having a male screw portion on an outer peripheral surface; A pair of right and left tightening nuts provided with a tightening operation portion having a tapered inner peripheral surface corresponding to the tapered outer peripheral surface and a tightening screw portion extending from the outer side of the tightening operation portion and having a female screw portion corresponding to the male screw portion; A cylindrical body surrounding the upper and lower connection ports, a pair of tightening nuts and underground distribution lines, and both side plates having underground distribution line through holes connected to both ends of the cylindrical body and through which underground distribution lines pass, A gas tank; A double-sided insulated sealing material for sealing between an outer peripheral surface of the underground distribution line and both ends of the insulated gas tank; And an insulating water-proof cover surrounding the outer circumferential surface of the underground distribution line and the insulative sealant and the insulated gas tank, wherein the cylindrical body constituting the insulated gas tank includes a metal cylinder and an inner and outer circumferential surfaces of the metal cylinder, And an end plate constituting the insulated gas tank is inserted into both ends of the cylindrical body and has an inserting portion whose outer circumferential surface is brought into close contact with the inner circumferential surface of the cylindrical body and a finishing portion which is brought into close contact with both end faces of the cylindrical body, Wherein an insulating gas injection valve is coupled to the valve coupling hole formed in any one of the end plates, the insulating sealing material is formed by applying an epoxy resin in an uncured state between a hard plate and an underground distribution line, The waterproof coating is formed by applying an epoxy resin in an uncured state to the outer circumferential surface of the insulating gas tank, the outer circumferential surface of the insulating sealing material and the outer circumferential surface of the underground distribution cable Wherein the insulating waterproof coating is formed by applying heat to the applied epoxy resin and curing the insulating waterproof coating, the insulating waterproof coating covering the insulating gas tank, an insulating sealing material covering portion covering the insulating sealing material, And an underground distribution line covering portion covering the underground distribution line.

According to the present invention, an upper contact portion is formed in a hollow shape so that an underground distribution line can penetrate through and is protruded downward on an inner circumferential surface to have a plurality of upper contact protrusions which are in press contact with both side underground distribution lines, An upper tapered portion having a tapered outer circumferential surface and an upper connection port made of a conductive material having a fastening screw portion formed outwardly from the upper taper portion and formed in a hollow shape and having a male screw portion on an outer circumferential surface; A lower contact portion formed in a hollow form so as to allow the underground distribution line to penetrate and having a plurality of lower contact protrusions formed upwardly protruding from the inner circumferential surface so as to be in pressure contact with both side underground distribution lines; An upper connection port made of a conductive material having a lower tapered portion having a tapered outer peripheral surface and a tightening screw portion formed outwardly from the lower tapered portion and formed as a hollow and having a male screw portion on an outer peripheral surface; A pair of right and left tightening nuts provided with a tightening operation portion having a tapered inner peripheral surface corresponding to the tapered outer peripheral surface and a tightening screw portion extending from the outer side of the tightening operation portion and having a female screw portion corresponding to the male screw portion; A cylindrical body surrounding the upper and lower connection ports, a pair of tightening nuts and underground distribution lines, and both side plates having underground distribution line through holes connected to both ends of the cylindrical body and through which underground distribution lines pass, A gas tank; A double-sided insulated sealing material for sealing between an outer peripheral surface of the underground distribution line and both ends of the insulated gas tank; And an insulated waterproof cover surrounding the outer circumferential surface of the underground distribution line and the insulative sealant and the insulated gas tank. The underground distribution line is connected by the upper and lower connection ports, and the connection is made more tightly by the tightening nut, It is primarily insulated by the SF6 gas injected into the gas tank, and when an arc arises between the ground distribution line and the upper and lower connection ports, it is promptly extinguished so that defective connection and damage due to the arc can be eliminated, The insulation and waterproofing are reinforced by the waterproof cloth, and insulation and waterproofing of the connection part of the underground distribution line are ensured, so that it is possible to prevent a fire or an electric shock accident caused by a short circuit.

1 to 10 show a preferred embodiment of a connector for connecting a switchboard of an underground power distribution line according to the present invention,
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a power distribution port for underground power to which a connector for connecting an underground distribution line of the present invention is applied;
FIG. 2 is an external perspective view of a connector for connecting an underground distribution line to an A /
Fig. 3 is an exploded perspective view of a switchboard connecting connector of an underground power distribution line according to the present invention, Fig.
Fig. 4 is a longitudinal sectional view of a connector for connecting an underground distribution line according to the present invention,
5 to 10 are process drawings showing a process of connecting underground distribution lines according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a connector for connecting an underground distribution line to a switchboard according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, in establishing the underground distribution line, the underground distribution power line 1 is embedded in the ground and the underground distribution line C is installed inside the underground distribution power line 1.

The submerged power transmission port 1 manufactures the power port block 2 in the factory and transports it to the site and connects the plurality of power port blocks 2 to install the power transmission port 1 of the required length do.

Between the power port blocks 2, a sealing portion 3 is installed to prevent intrusion of rainwater, ground water, etc. into the power port.

The underground distribution line C is seated on a tray (not shown) that is positionally adjustable in a shelf (not shown) fixed to both side walls of the underground distribution line power supply 1 and the distance between the underground distribution lines C So that it can be adjusted.

The ground distribution line C is a cable having a predetermined length and is connected by the connector 100 for connection.

The connector 100 includes a plurality of upper contact protrusions 112 formed in a hollow form so that the underground power distribution lines C1 and C2 can penetrate therethrough and protruded downward on the inner circumferential surface to be in contact with the underground power distribution lines C1 and C2, An upper tapered portion 113 having a tapered outer circumferential surface 114 formed to be hollow and extending outward from the upper contact portion 111; An upper connection port 110 made of a conductive material and extending outwardly and formed in a hollow shape and having a screw thread part 115 having a male screw part 116 formed on an outer circumferential surface thereof; A lower contact portion 121 having a plurality of lower contact protrusions 122 which are formed in a hollow form so that the underground power distribution lines C1 and C2 can penetrate and which are protruded upward from the inner circumferential surface and are in press contact with the underground distribution lines C1 and C2 A lower tapered portion 123 extending outwardly from the lower contact portion 121 and having a hollow shape and having a tapered outer peripheral surface 124 and a hollow portion 123 extending outwardly from the lower tapered portion 123, A lower connection port 120 made of a conductive material and provided with a fastening screw portion 125 having a male screw portion 126 formed on an outer circumferential surface thereof; A tightening operation part 131 having a tapered inner circumferential surface 132 corresponding to the tapered outer circumferential surfaces 114 and 124 and a fastening protruding part 131 extending from the outside of the tightening operation part 131, A pair of left and right tightening nuts 130 provided with a tightening screw 133 formed with corresponding female threads 134; A cylindrical body 141 surrounding the upper and lower connection ports 110 and 120 and a pair of tightening nuts 130 and underground power distribution lines C1 and C2 and a cylindrical body 141 coupled to both ends of the cylindrical body 141, An insulated gas tank 140 filled with SF6 gas G and equipped with a pair of side plates 144 formed with underground distribution line through holes 145 through which C1, C2 are passed; A double-sided insulation seal 160 sealing between the outer peripheral surface of the underground distribution lines C1 and C2 and both ends of the insulation gas tank 140; And an insulating waterproof cover 170 surrounding the outer circumferential surface of the underground power distribution lines C1 and C2 and the insulating seal 160 and the insulating gas tank 140. [

The upper and lower contact protrusions 112 and 122 of the upper and lower connection ports 110 and 120 are electrically connected to each other when the underground distribution lines C1 and C2 are insulated coated wires and the insulation of the underground distribution lines C1 and C2 It is possible to constitute such that it contacts the conductive wire after penetrating through the coating.

The outer circumferential surface of the tightening screw portion 133 of the tightening nut 130 may be formed in a hexagonal shape so that a turning tool such as a spanner can be engaged.

The cylindrical body 141 constituting the insulated gas tank 140 is preferably composed of a metal cylinder 142 and an insulating cover 143 covering both inner and outer circumferential surfaces of the metal cylinder 142 .

The end plate 144 has an insertion portion 146 inserted into both ends of the cylindrical body 141 and having an outer circumferential surface which is brought into close contact with the inner circumferential surface of the cylindrical body 141, (147).

When the cylindrical body 141 and the hard plate 144 are coupled to each other, an adhesive is applied to the outer peripheral surface of the insertion portion 146 of the hard plate 144 and the inner peripheral surface of the corresponding cylindrical body 141, 144 are brought into tight contact with each other.

A valve coupling hole 148 to which the insulating gas injection valve 150 is coupled is formed in any one of the end plates 144.

The valve 150 for injecting insulated gas has a valve casing 151 formed in a hollow shape similar to a conventional air inlet and having a valve seat 152 and a fixing spring receiver 153 formed on an inner circumferential surface of the valve casing 151, A valve plate 154 slidably installed inside the valve seat 152 and having a valve plate 155 for opening and closing the valve seat 152; And a spring 156 that elastically supports the rod 154 in a direction to close the rod 154 (see Fig. 4).

The insulative sealing member 160 is for maintaining the airtightness between the underground distribution line through hole 145 formed in the end plate 144 of the insulated gas tank 140 and the ground distribution lines C1 and C2. It is preferable to use an epoxy resin having excellent properties.

The insulating seal 160 can be formed by applying an epoxy resin in an uncured state between the hard plate 144 and the ground distribution lines C1 and C2 and applying heat to harden it.

The insulated sealing member 160 is formed with an underground distribution line through hole 161 through which the underground distribution lines C1 and C2 pass through during the molding process described above and the inner circumferential surface of the underground distribution line through hole 161 is formed in the ground Tightly close to the outer circumferential surfaces of the power distribution lines C1, C2.

The insulating waterproofing coating 170 is formed by applying an epoxy resin in an uncured state to the outer peripheral surface of the insulating gas tank 140, the outer peripheral surface of the insulating sealing material 160 and the outer peripheral surfaces of the ground distribution lines C1 and C2, Winding the epoxy resin or the wound epoxy resin sheet on the outer circumferential surface of the gas tank 140, the outer circumferential surface of the insulating seal 160 and the outer circumferential surfaces of the underground distribution lines C1 and C2, have.

The insulating waterproof cover 170 includes an insulating gas tank covering portion 171 covering the insulating gas tank 140, an insulating sealing material covering portion 172 covering the insulating sealing material 160, C1, and C2, respectively.

A ground distribution line through hole 174 through which ground distribution lines C1 and C2 pass is formed in the underground distribution line covering portion 173 and an inner circumferential surface of the underground distribution line through hole 174 is connected to a ground distribution line C1 , C2).

Hereinafter, a process of connecting the underground distribution lines C1 and C2 by the switchgear connection connector of the underground distribution line of the present invention will be described.

5, the tightening nut 130 and the cylindrical body 141 of the insulating gas tank 140 and the end plate 144 are fitted in advance on both side underground distribution lines C1 and C2 to be connected, The upper connection port 110 and the lower connection port 120 are disposed above and below the connection ends of the first and second connection terminals C1 and C2. At this time, an insulating gas injection valve 150 is coupled to the one end plate 144 in advance.

The upper and lower connection ports 110 and 120 are made to approach the outer circumferential surface of the connection end of the underground distribution lines C1 and C2 and pressurized using a tool such as a Handy Press, The tips of the lower contact protrusions 112 and 122 penetrate through the covering of the underground power distribution lines C1 and C2 and come into contact with the conductive wires in a state of being embedded.

7, the tightening nut 130 is moved toward both sides of the upper and lower connection ports 110, 120 so that the female thread portion 134 formed on the tightening screw portion 133 of the tightening nut 130 is moved upward and downward And fastened to the male threaded portions 116, 126 formed on the tightening threaded portions 115, 125 of the connection ports 110, 120.

At this time, tapered portions 113 and 123 having tapered outer peripheral surfaces 114 and 124 are provided on the inside of the tightening screw portions 115 and 125 of the upper and lower connection ports 110 and 120, Since the tightening operation part 131 having the tapered inner circumferential surface 132 corresponding to the tapered outer circumferential surfaces 114 and 124 is provided on the inside of the tightening screw part 133, the tapered outer circumferential surfaces 114 and 124, The upper and lower connection ports 110 and 120 come closer to the underground distribution lines C1 and C2 by the action of the upper and lower connection ports 110 and 120 and the upper and lower contact protrusions 112 and 122 of the upper and lower connection ports 110 and 120 The connection lines C1 and C2 are more tightly connected through the upper and lower connection ports 110 and 120 while being deeply inserted into the conductive lines of the underground power distribution lines C1 and C2.

The cylindrical body 141 and the hard plate 144 constituting the insulating gas tank 140 are moved to the positions where the upper and lower connection ports 110 and 120 and the tightening nut 130 are coupled And the end plate 144 is coupled to both ends of the cylindrical body 141.

At this time, on both end faces of the cylindrical body 141 corresponding to the inner peripheral face of the cylindrical body 141 corresponding to the outer peripheral face of the insertion portion 146 of the end plate 144 and the inner side face of the finished portion 147 of the end plate 144 The adhesive is applied so that the cylindrical body 141 and the hard plate 144 are tightly coupled.

SF6 gas (G) is injected into the interior of the insulating gas tank (140) in which the cylindrical body (141) and the hard plate (144) are tightly coupled. At this time, the SF6 gas G is injected through the insulated gas injection valve 150 coupled to the one end plate 144. When the insulated gas injector (not shown) is connected to the insulated gas injection valve 150 to press the valve rod 154, the valve rod 154 and the valve plate 155 formed thereon are pushed against the spring 156 The valve plate 155 which is in close contact with the valve seat 152 is moved away from the valve seat 152 so that the valve is opened so that the SF6 gas G flows into the interior of the insulating gas tank 130 through the valve casing 151 . When the insulating gas injector is detached from the insulating gas injection valve 150 after the injection of the SF6 gas G and the valve rod 154 and the valve plate 155 formed thereon are returned by the spring 156, Is brought into close contact with the valve seat 152 so that the valve is closed again so that the SF6 gas G injected into the insulating gas tank 140 is not leaked.

An epoxy resin in an uncured state is applied between the outer surface of the rigid plate 144 and the outer peripheral surface of the underground power distribution lines C1 and C2 so as to be cured by applying heat so that the insulation sealant 160 is molded do.

The insulating seal 160 seals between the insulated gas tank 140 and the underground distribution lines C1 and C2 to more reliably prevent the SF6 gas G from leaking.

An insulating waterproof cover 170 is formed on the outer circumferential surface of the cylindrical body 141 of the insulating gas tank 140 and the outer circumferential surface of the insulative sealant 160 and the outer circumferential surfaces of the underground power distribution lines C1 and C2 It is possible to prevent the leakage of the SF6 gas G injected into the insulated gas tank 140 and prevent the infiltration of water into the connecting portions of the underground power distribution lines C1 and C2, (C1, C2).

The insulating waterproof cover 170 is formed by applying an epoxy resin in an uncured state to the outer circumferential surface of the insulating gas tank 140, the outer circumferential surface of the insulating sealing material 160 and the outer circumferential surfaces of underground power distribution lines C1 and C2, Winding can be carried out on the outer circumferential surface of the tank 140, the outer circumferential surface of the insulative sealing material 160 and the outer circumferential surfaces of the underground power distribution lines C1 and C2, and the applied epoxy resin or wound epoxy resin sheet is cured by applying heat thereto .

The ground distribution lines C1 and C2 are connected by the upper and lower connection ports 110 and 120 while the connection of the ground distribution lines C1 and C2 is completed and the connection is further tightened by the tightening nut 130 And is primarily insulated by the SF6 gas G injected into the insulated gas tank 140. When an arc arises between the ground distribution lines C1 and C2 and the upper and lower connection ports 110 and 120, Insulation and waterproofing are enhanced by the insulating seal 160 and the insulating waterproof coating 170 so that the insulation and waterproofing of the connecting portions of the underground power distribution lines C1 and C2 It is surely done.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or essential characteristics thereof. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

1: Underground distribution power section C1, C2: Underground distribution section
100: connector 110, 120:
111, 121: contact portion 112, 122: contact projection
113, 123: tapered portions 114, 124: tapered outer peripheral surface
115, 125: pressure screw portion 116, 126: male thread portion
130: tightening nut 131: tightening operation part
132: tapered inner peripheral surface 133: tightening screw
134: female thread part 140: insulated gas tank
141: Cylindrical body 144:
150: Insulating gas injection valve 160: Insulation sealing material
170: Insulation waterproofing cloth

Claims (1)

An underground distribution line connector (100) for connecting an underground distribution line connecting underground distribution lines (C1, C2) distributed through an underground distribution power source (1) buried in the ground,
The connector 100 has a plurality of upper contact protrusions 112 which are formed in a hollow shape so that the underground distribution lines C1 and C2 can penetrate and protrude downward on the inner circumferential surface to be in contact with the underground distribution lines C1 and C2 An upper tapered portion 113 having a tapered outer circumferential surface 114 formed to be hollow and extending outward from the upper contact portion 111; An upper connection port 110 made of a conductive material and having a screw thread part 115 formed in a hollow shape and extending to the outer surface of the case 100 and having a male screw part 116 formed on the outer surface thereof; A lower contact portion 121 having a plurality of lower contact protrusions 122 which are formed in a hollow form so that the underground power distribution lines C1 and C2 can penetrate and which are protruded upward from the inner circumferential surface and are in press contact with the underground distribution lines C1 and C2 A lower tapered portion 123 extending outwardly from the lower contact portion 121 and having a hollow shape and having a tapered outer peripheral surface 124 and a hollow portion 123 extending outwardly from the lower tapered portion 123, A lower connection port 120 made of a conductive material and provided with a fastening screw portion 125 having a male screw portion 126 formed on an outer circumferential surface thereof; A tightening operation part 131 having a tapered inner circumferential surface 132 corresponding to the tapered outer circumferential surfaces 114 and 124 and a fastening protruding part 131 extending from the outside of the tightening operation part 131, A pair of right and left tightening nuts 130 provided with a fastening screw 133 formed with corresponding female thread 134; A cylindrical body 141 surrounding the upper and lower connection ports 110 and 120 and a pair of tightening nuts 130 and underground power distribution lines C1 and C2 and a cylindrical body 141 coupled to both ends of the cylindrical body 141, An insulated gas tank 140 filled with SF6 gas G and equipped with a pair of side plates 144 formed with underground distribution line through holes 145 through which C1, C2 are passed; A double-sided insulation seal 160 sealing between the outer peripheral surface of the underground distribution lines C1 and C2 and both ends of the insulation gas tank 140; And an insulating waterproof cover 170 surrounding the outer circumferential surface of the ground distribution lines C1 and C2 and the insulating seal 160 and the insulating gas tank 140,
The cylindrical body 141 constituting the insulating gas tank 140 is constituted of a metal cylinder 142 and an insulating cover 143 covering both inner and outer peripheral surfaces of the metal cylinder 142,
The rigid plate 144 constituting the insulated gas tank 140 includes an insertion portion 146 inserted into both ends of the cylindrical body 141 and having an outer circumferential surface closely contacting the inner circumferential surface of the cylindrical body 141, And a finishing portion 147 which is in close contact with both end surfaces of the finishing portion 147,
An insulated gas injection valve 150 is coupled to a valve coupling hole 148 formed in any one of the rigid plates 144,
The insulating sealing member 160 is formed by applying an epoxy resin in an uncured state between the hard plate 144 and the ground distribution lines C1 and C2 and curing by applying heat,
The insulating waterproofing coating 170 applies an epoxy resin in an uncured state to the outer peripheral surface of the insulating gas tank 140, the outer peripheral surface of the insulating sealing material 160 and the outer peripheral surfaces of the ground distribution lines C1 and C2, And then curing the mixture by applying heat,
The insulating waterproof cover 170 includes an insulating gas tank covering portion 171 covering the insulating gas tank 140, an insulating sealing material covering portion 172 covering the insulating sealing material 160, C1, C2 of the underground distribution line covering portion 173.

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