KR100834558B1 - Surge arrester for transmission of electricity and the method thereof - Google Patents

Abstract

The present invention provides an arrester core (110) wound around an aluminum block (104) and a zinc oxide cylinder (102) with plastic impregnated glass fibers in a rhombus lattice shape;

When the abnormal current is applied, a plurality of through-holes 120a are formed to prevent breakage of the arrester core 110 and to radiate the internal pressure to the outside to prevent a fire, and at a predetermined interval on the outer circumferential surface of the arrester core 110. Pressure discharge pipe 120 to be discharged,

A flame retardant resin layer 130 cured by injecting and curing a flame retardant resin into a space between the arrester core 110 and the pressure relief pipe 120,

An enclosed rod 140 that is fixedly screwed into a screw hole 104a formed at a center of an outer end portion of the aluminum block 104 of the arrester core 110 and connected to a ground wire;

It consists of a rubber layer 160 which covers the lightning arrestor core 110, the flame retardant resin layer 130, the pressure relief pipe 120 and the outer portion of the enclosed 140 to cover the leakage current to prevent an electric shock accident. The present invention relates to an insulation tube protection device for a transmission line cable junction box and a method of manufacturing the same.

Transmission line, cable junction box, insulation box, protection device, arrester core, pressure relief pipe, flame retardant resin

Description

Insulation tube protector for transmission line cable junction box and its manufacturing method {SURGE ARRESTER FOR TRANSMISSION OF ELECTRICITY AND THE METHOD THEREOF}

1 is a partial cross-sectional view schematically showing a conventional lightning arrester,

Figure 2 is a perspective view schematically showing an insulated container protection device for a transmission line cable connection box according to an embodiment of the present invention,

3 is a longitudinal cross-sectional view of FIG.

4 is a schematic cross-sectional view of an arrester core in which a zinc oxide cylinder is wound between aluminum blocks in a state in which a glass-impregnated glass fiber chamber is wound to integrally couple a zinc oxide cylinder between aluminum blocks;

FIG. 5 is a perspective view schematically illustrating a state in which a flame-retardant resin layer and a pressure-resistant pipe are laminated on the outer circumferential surface of the plastic-filled glass fiber thread layer of the arrester core in FIG. 4;

FIG. 6 is a perspective view schematically illustrating the pressure relief pipe in FIG. 5;

7 is a use state diagram showing a state in which the insulated tube protection device for the transmission line cable connection box according to an embodiment of the present invention connected to the transmission line,

8 is a flowchart of manufacturing an insulated container protection device for a transmission line cable connection box according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: insulator protection device 102: zinc oxide cylinder

104: aluminum block 104a: screw hole

104b: Receiving groove 104c: Circular recess

105: leaf spring 105a: through hole

106: glass fiber reinforced plastic layer 110: lightning arrester core

120: pressure relief pipe 120a: through hole

130: flame retardant resin layer 140: enclosed

140a: Threaded section 140b: Round groove

150: Nut 152: spring washer

160: rubber layer 170: ground wire

180: insulating tape layer 190: heat shrink tube

202: left copper box 204: first transmission line

204a: conductor 206: right copper box

208: second power transmission line 208a: conductor

210: conductor connecting sleeve 212: insulated tube

214: Left shield layer 216: Left ground terminal

218: right shield layer 220: right ground terminal

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulation tube protection device for a transmission line cable junction box and a method for manufacturing the same. In particular, the structure is simple, can be easily installed, and the installation cost can be reduced. The present invention relates to an insulation tube protection device for a transmission line cable junction box and a manufacturing method for preventing a high voltage from flowing into a cable shielding layer and destroying an insulation vessel of a transmission line cable junction box when an abnormal current such as a lightning strike and surge is applied.

BACKGROUND ART A lightning arrester widely used in the related art is disclosed in Korean Utility Model Publication No. 1983-0001777 (Notification Date; September 16, 1983).

The lightning arrestor disclosed in Korean Utility Model Publication No. 1983-0001777 is connected to the ground tank 2 in which a medium excellent in insulation such as gas is sealed by an insulating spacer 3, as shown in FIG. It is blocking the opening. Inside the grounding tank 2, it is arrange | positioned as the nonlinear resistance group 1 which is a characteristic element which fixed one end to the grounding tank 2, and the other end of this nonlinear resistance group 1 is connected to the high voltage conductor 4. As shown in FIG. . At both ends of the non-linear resistance group 1 in the axial direction, the connecting portions are surrounded by the electric field relaxation shield cylinders 27 and 28, respectively.

An umbrella type shielding device 26 is fixed to the high pressure side end of the non-linear resistance group 1, and a shield ring 20 as an annular member is integrally attached to the free end of the umbrella type shielding device 26. It is.

Between the axial ends of the nonlinear resistance group 1, two annular shields, for example, shield rings 21 and 22, which surround another outer circumference, are arranged so that the high-voltage conductor 4 is connected by the connecting conductors 30 and 31. At the same time, it is fixed to the side and at the same potential as that of the high-voltage conductor 4.

The characteristic point here is the opposing distance between the shield rings 20, 21 and 22 and the arrangement and shape of the connecting conductors 30 and 31. That is, since the equipotential lines passing through each of the shield rings are continuously connected to the equipotential surfaces of the nonlinear resistance group 1, as the equal potential lines are written together in a dotted line in the same plane, the nonlinear resistance group Discrete are arranged at a predetermined distance between at least two shield rings provided between the both ends of the axial direction of (1).

In addition, the connecting conductors 30 and 31 are composed of the width and the number of the peripheral directions within a range satisfying the above conditions for forming the equipotential lines (part of the equipotential surfaces) between the shield rings 20, 21 and 22, for example. It consists of a rod-shaped conductor, a plate-shaped conductor, a lead wire, etc., but when the shield rings 21 and 22 are fixed by the connection conductors 30 and 31, when the above-mentioned conditions cannot be satisfied, the connection conductor 30 And (31) may be performed with a mechanical support dielectric at least as an electrical connection member. Supporting and fixing the shield rings 21 and 22 to the high voltage conductor 4 side is for adjusting the potential distribution along the axial direction of the nonlinear resistance group 1. In other words, when the shield rings 21 and 22 are set to substantially the same potential as the high-voltage conductor 4, the shield rings 22 are electrically and insulatedly strict.

However, since the seal ring 22 is fixed to the equipotential portion via the connecting conductor 31, the seal ring 22 is not required because the insulation support is not required between the ground tank 2 requiring electrical insulation. The ground tank 2 can be accessed using the excellent dielectric strength of SF ₆ gas. This makes it possible to make the position of the seal ring 22 most desirable for adjusting the potential distribution of the nonlinear resistance group 1.

In order to weaken the surface electric field of the seal ring 22, the diameter, i.e., the width to be matched in the axial direction of the nonlinear resistance group 1 may be increased.

In particular, the seal ring 22 is adjacent to the ground potential side as one half of the axial length of the nonlinear resistance group 1, and according to its thickness, the electric field relaxation action and excellent insulation such as SF ₆ gas can be conveniently used. have. The diameter of the seal ring 20 is smaller than that of the other seal rings, so that the high pressure side of the nonlinear resistance group 1 is effective in improving the potential main body, and the large diameter of the seal ring 22 is the nonlinear resistance group 1. This is effective for improving the potential distribution of the ground potential axis of.

Further, when the number of shield rings located between both ends of the nonlinear resistance group 1 in the axial direction is three or more, the distance between the shield rings 20 and 21 at the high voltage side is greater than the distance between the shield rings 21 and 22. By shortening, it was confirmed by experiment that the potential distribution on the ground potential side of the nonlinear resistance group 1 can be satisfactorily established.

However, the conventional lightning arrester configured as described above has a problem that the structure is complicated and the manufacturing cost can not be reduced, and it takes a lot of time to install and must be installed by skilled workers, so that the installation cost cannot be reduced. There were various problems.

Accordingly, the present invention has been made to solve the above-mentioned various problems, and an object of the present invention is to provide an insulated tube protective device for a cable connection box and an economical transmission line of a simple structure and low cost.

Another object of the present invention is that when an abnormal current, such as a lightning strike and open / close surge, flows into a cable, an insulation cylinder protection device starts to discharge to prevent breakdown of the insulation cylinder for the cable junction box. In this case, when excessive pressure and heat are generated in the arrester core in the insulator protection device, the arrester core is prevented from being destroyed, and the transmission line for preventing fire caused by sparks as well as damage to the arrester core. It is an object of the present invention to provide an insulation tube protection device for a cable junction box and a method of manufacturing the same.

In order to achieve the above object, the insulation tube protection device for a transmission line cable junction box of the present invention is provided with a plastic impregnated glass fiber thread layer by winding a plastic impregnated glass fiber thread in a rhombus lattice shape on the outer circumferential surface of the aluminum block and the zinc oxide cylinder. A pressure relief pipe made of a fiber arrester core, a glass fiber reinforced plastic formed at a predetermined distance from the outer circumferential surface of the arrester core, and arranged at regular intervals on the outer circumferential surface of the plastic impregnated glass fiber thread layer of the arrester core, and the plastic The flame-retardant resin layer cured by injecting and curing a flame-retardant resin into the space between the impregnated glass fiber thread layer and the pressure-resistant pipe, a copper rod which is fixedly screwed together in a screw hole formed in the center of the outer end of the aluminum block of the arrester core, Do not loosen from the aluminum block Characterized in that consists of a nut and each nahap, the arrester core and the rubber layer being covered namgyeonotgo bangap pipe and the outer part of the supplied is via the spring washer in the screw portion formed on the outer peripheral surface of the group enclosed.

In addition, the manufacturing method of the insulation tube protection device for the transmission line cable junction box of the present invention is a zinc oxide cylinder forming step of forming a zinc oxide cylinder by injecting an aluminum block and zinc oxide powder into a mold, and the inner surface of the aluminum block The plate spring installation step of inserting the plate spring in the formed receiving groove, and the plate spring installed in the receiving groove of the aluminum block, respectively in contact with both ends of the zinc oxide cylinder formed in the zinc oxide cylinder forming step, respectively 300 kgf to the zinc oxide cylinder side from the outer side An arrester core manufacturing step of winding a plastic impregnated glass fiber thread in a rhombus lattice shape on the concave surface of the aluminum block and the outer circumferential surface of the zinc oxide cylinder to form a lightning arrester core, respectively, by pressing with a force of 500 kgf, and the outer circumferential surface of the arrester core Arrester arrester core disposing step of arranging the arrester core at a predetermined interval inside the pressure-resistant pipe in which a plurality of through-holes are formed, and injecting a flame-retardant resin in the space formed between the outer peripheral surface of the arrester core and the inner peripheral surface of the pressure-proof pipe 100 The flame-retardant resin layer forming step of forming a flame-retardant resin layer by heating and curing at a temperature of ℃ to 200 ℃, and after forming a flame-retardant resin layer between the outer peripheral surface of the arrester core and the inner peripheral surface of the pressure-proof pipe, the aluminum block of the arrester core Ground in the screw holes respectively formed in the center of the outer end The enclosed screwing step for screwing and fixing the enclosed rods, and through the spring washer at the threaded portions formed on the outer circumferential surface of the enclosed rod so that the enclosed rods are not loosened in the screw holes respectively formed in the center of the outer end of the aluminum block. The nut nut joining step, and the rubber layer covering step of covering the arrester core, the pressure-relief pipe and the outer surface of the enclosed part with a rubber layer so as to block the leakage current to prevent an electric shock accident.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, an insulated tube protective device for a transmission line cable junction box according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a perspective view schematically showing an insulator box protecting apparatus for a cable line junction box according to an embodiment of the present invention, FIG. 3 is a longitudinal section of FIG. 2, and FIG. 4 is a zinc oxide source between aluminum blocks in FIG. 2. Fig. 5 is a cross-sectional view schematically showing an arrester core in which a zinc oxide cylinder is integrally bonded between aluminum blocks by winding a plastic-impregnated glass fiber thread in a state in which a main body is in contact with the main body, and FIG. 5 is a plastic impregnated glass of the arrester core in FIG. 4. 6 is a perspective view schematically showing a state in which a flame retardant resin layer and a pressure-resistant pipe are laminated on an outer circumferential surface of the fiber thread layer, FIG. 6 is a perspective view schematically showing a pressure-proof pipe, and FIG. 7 is a transmission line cable according to an embodiment of the present invention. It is a use state diagram which shows the state which connected the insulation box protection device for junction boxes to the transmission line.

As shown in FIGS. 2 to 6, the insulating tube protection device 100 for a transmission line cable junction box according to an embodiment of the present invention is a plastic impregnated glass on the outer circumferential surface of the aluminum block 104 and the zinc oxide cylinder 102. When the arrester core 110 wound around the fiber chamber and the abnormal current (at the time of lightning or open / close surge occurrence), the internal high heat and the internal high pressure of the arrester core 110 are radiated to the outside to damage the arrester core 110. And a pressure relief pipe 120 having a plurality of through-holes 120a formed to prevent the occurrence of fire and disposed at a predetermined interval on the outer circumferential surface of the plastic impregnated glass fiber thread layer 106 of the arrester core 110 and the plastic impregnation. In the center of the outer end portion of the aluminum block 104 of the flame retardant core 110 and the flame-retardant resin layer 130 is hardened by injecting a flame-retardant resin into the space between the glass fiber thread layer 106 and the pressure-resistant pipe 120 Formed A spring washer (Spring washer) is formed on the copper rod 140 (copper rod) that is screwed into the four holes 104a and the threaded portion 140a formed on the outer circumferential surface of the copper rod 140 to prevent the copper rod 140 from being released from the aluminum block 104. 152 and the rubber layer 160 covering the outer circumferential surface of the arrester core 110, the pressure-proof pipe 120 and the enclosed 140 to prevent the electric shock by blocking the leakage current through the nut 150, respectively. )

Next, the ground wires 170 are crimped and fixed in circular grooves 140b respectively formed at the outer ends of the copper rods 140. Next, the connection portions of the copper rods 140 and the ground wires 170 are insulated from each other. Covered with (180), the heat shrinkable tube 190 is shrunk by heat to protect both sides of the rubber layer 160, the insulating tape layer 180 and the ground line 170.

The lightning arrestor core 110 is formed by compressing zinc oxide (ZnO) powder in the shape of a cylinder to maintain an insulation state in normal operation, and conducting zinc oxide cylinders that are conducting when an abnormal current (in case of lightning or open / close surge occurs) is applied. 102 and an aluminum block 104 disposed so that one end portion is abutted at both ends in the longitudinal direction of the zinc oxide cylinder 102, and a screw hole 104a is formed at the center of the opposite end portion, and the aluminum block 104. And a plastic impregnated glass fiber thread layer 106 wound around the aluminum block 104 and the zinc oxide cylindrical body 102 so as to integrally fix the zinc oxide cylinder 102. Consists of.

The lightning arrestor core 110 is always electrically in contact with the zinc oxide cylinder 102 and the aluminum block 104 even when the zinc oxide cylinder 102 and the aluminum block 104 are contracted due to a temperature change. The leaf spring 105 is installed in the receiving groove 104b formed inside the aluminum block 104.

The through hole 105a is formed at the center of the leaf spring 105 so that the leaf spring 105 expands or contracts small according to temperature change.

Since the through hole 105a is located at the center of the leaf spring 105, when the temperature rises, the expansion is absorbed by the central through hole 105a of the leaf spring 105, and when the temperature decreases, the leaf spring 105 of the leaf spring 105 By absorbing the contraction in the central through hole (105a) serves to reduce the expansion, contraction of the leaf spring 105

The use state of the lightning arrester 100 of the present invention configured as described above will be described in detail with reference to FIG.

As shown in FIG. 7, the conductor 208a of the first transmission line 204 entered into the left copper (copper) box 202 and the conductor 208a of the second transmission line 208 entering into the right copper box 206. Is electrically connected using the connecting conductor 210, and is insulated by the insulating cylinder 212.

The right ground terminal 220 is provided on the outer surface of the right shielding layer 218 between the left copper box 202 and the right copper box 206.

In addition, a left ground terminal 216 is provided on the outer surface of the left shielding layer 214 of the left copper box 202, and the left contact terminal 216 of the right copper box 206 is provided in the present invention. One side ground line 170 of the lightning arrester for power transmission is connected, and the other side ground line 170 of the insulated tube protection device for a cable line connection box of the present invention is connected to the right contact terminal 220.

Next, a description will be given of a method of manufacturing an insulated tube protective device for a transmission line cable connection box according to an embodiment of the present invention.

8 is a flowchart of manufacturing an insulated container protection device for a transmission line cable connection box according to an embodiment of the present invention.

As shown in FIG. 8, first, aluminum block molding and zinc oxide powder are injected into a mold to form a zinc oxide cylinder 102 (aluminum block and zinc oxide cylinder molding step), and then the inside of the aluminum block 104 is formed. Inserting the leaf spring 105 in the receiving groove 104b formed on the surface (surface abuts with the zinc oxide cylinder 102) (plate spring mounting step), between the leaf spring 105 and the leaf spring 105 In contact with both ends of the zinc oxide cylinder 102

Plastic-impregnated glass on the concave surface 104c of the aluminum block 104 and the outer circumferential surface of the zinc oxide cylinder 102 while pressing each other by a force of 300 kgf to 500 kgf from both outer surfaces of the aluminum block 104 toward the inner side. The fiber yarn is wound in a rhombus lattice to manufacture an arrester core 110 (arrestor core manufacturing step).

On the outer circumferential surface of the arrester core 110, the arrester core 110 is disposed at a predetermined interval inside the pressure-proof pipe 120 having the through-hole 120a formed at a predetermined interval (arrestor core excretion step), and the pressure relief The flame-retardant resin layer was injected into a flame-retardant resin solution in a space formed between the outer circumferential surface of the arrester core 110 and the inner circumferential surface of the pressure relief pipe 120 disposed in the pipe 120 and heated and cured at a temperature of 100 ° C. to 200 ° C. 130 is formed (flame retardant resin layer forming step).

After forming the flame retardant resin layer 130 between the outer circumferential surface of the arrester core 110 and the inner circumferential surface of the pressure-proof pipe 120 in the flame retardant resin layer forming step, the outer side of the aluminum block 104 of the arrester core 110 The enclosed rod 140 is screwed into the screw holes 104a respectively formed at the center of the end (enclosed screwing step), and the screw holes 104a respectively formed at the center of the outer end of the aluminum block 104 in the enclosing screwing step. The nut 150 is screwed together through a spring washer 152 to the threaded portion 140a formed on the outer circumferential surface of the rod 140 so as to prevent loosening of the respective rods 140 screwed together (nut screwing step).

Covering the outer circumferential surface with the rubber layer 160 (rubber layer coating step), leaving the outer end of the copper rod 140 to be connected to the pressure-pressure pipe 120 and the ground wire 170.

In addition, after the rubber layer coating step, each of the ground wires 170 are inserted into the circular grooves 140b formed at the outer ends of the copper rods 140, respectively, to be crimped and fixed, and the copper wires 140 and the ground wires 170 The connection part is covered with an insulating tape layer 180, and both sides of the rubber layer 160, the insulating tape layer 180, and the ground wire 170 are covered with the heat shrink tube 190, and then contracted by heat.

The rubber layer coating step may include an injection hole formed in a mold after leaving the outer part of the arrester core 110, the flame retardant resin layer 130, the pressure relief pipe 120, and the encapsulation 140 in a mold (not shown). A rubber melt is injected through (not shown) to cure at a temperature of 130 ° C to 180 ° C.

Next, the operation and effect of the lightning arrester according to the embodiment of the present invention configured as described above will be described.

First, the zinc oxide cylinder 102 of the arrester core 110 is formed by compressing zinc oxide (ZnO) powder in the shape of a cylinder, and plate springs 105 are formed at both ends of the zinc oxide cylinder 102. ) Is fixed by a pair of aluminum blocks 104 wound by a plastic impregnated glass fiber thread and is electrically connected to each other firmly.

The arrester core 110 and the arrester core 110 may be contracted by the elastic force of the leaf spring 105 even when the aluminum blocks 104 contacted inside the arrester core 110 are contracted according to temperature changes. The arrester core 110 maintains the electrical connection well.

As illustrated in FIG. 7, the zinc oxide cylinder 102 is normally insulated in a state in which a lightning arrester 100 according to an embodiment of the present invention is connected, but is introduced through a transmission cable conductor. When an abnormal current, for example, a lightning strike or an inflow current of an opening / closing surge is induced to a voltage of one shielding layer 214 on the cable insulator by an electrostatic induction action, an insulation tube for insulating both ends of the cable junction box 200 ( 212 may be dielectrically broken by both potential differences.

Therefore, the insulation cylinder protection device 100 starts discharge in this situation, and solves the potential difference across the insulation cylinder 212.

In the above description, when an abnormal high voltage, for example, an abnormal voltage such as a lightning strike, is applied to the second power transmission line 208, the operation is reversed.

On the other hand, if an abnormal current, such as a lightning strike, flows into the insulation tube protection device 100 for the transmission line cable junction box according to an embodiment of the present invention, the inflow current is on the cable insulator by an electrostatic induction action. A voltage is induced in one shielding layer, and the insulation cylinder protection device 100 starts discharging in this situation to solve the potential difference across the insulation cylinder 212.

However, high pressure and high temperature heat may occur in the arrester core 110. In this case, the flame-retardant resin layer 130 melts and receives pressure from the pressure-pressure side of the pressure-dissipating pipe 120. Pressure and heat are ejected to 120a to prevent the destruction of the zinc oxide (ZnO) cylinder of the arrester core 110, thereby preventing the damage of sparks and debris or a fire caused by the flame.

One side ground line 170 is connected to one side of the first power transmission line 204, and the other ground line 170 is connected to the second power transmission line 208, so that abnormal high pressure such as a lightning strike is applied to a power line not shown. The abnormal high voltage may be bypassed to the ground (not shown) through the ground line 170 to prevent a short circuit accident of a transmission line (not shown), damage to the arrester core 110, and the worst fire.

Therefore, the present invention is simple in structure and can be easily installed to reduce manufacturing and installation costs, as well as abnormal currents such as lightning, etc. applied to the transmission line, thereby generating high pressure and high temperature heat. The islands may radiate heat to the outside to prevent breakage of the arrester core 110 and generation of fire.

In the above description, the specific embodiments have been shown and described, but the present invention is not limited thereto, for example, by those skilled in the art without departing from the concept of the present invention. Of course, the design can be changed in various ways.

As described above, according to the manufacturing method of the insulation tube protection device for the transmission line cable junction box of the present invention, the structure is simple and easy to install, and at the same time, it is possible to reduce the manufacturing and installation costs, as well as to the transmission line. Even when a current such as an abnormal current such as a lightning strike is applied to generate high temperature heat and high pressure, the pressure relief pipe 120 wraps and supports the arrester core 110 so that pressure is applied to the arrester core 110. The high temperature heat of the arrester core 110 is prevented from being damaged, and the flame retardant resin layer 130 melts to radiate to the outside through the through-hole 120a of the pressure relief pipe 120, thereby arresting the arrester core 110. There is an excellent effect to prevent the injury and fire caused by sparks and debris caused by the breakage.

Claims (5)

An arrester core 110 wound around a plastic impregnated glass fiber thread on an outer circumferential surface of the aluminum block 104 and the zinc oxide cylinder 102; A pressure relief pipe 120 disposed at regular intervals on an outer circumferential surface of the arrester core 110 to prevent breakage of the arrester core 110 and radiate internal heat to the outside during application of abnormal high pressure; A flame retardant resin layer 130 cured by injecting and curing a flame retardant resin into a space between the arrester core 110 and the pressure relief pipe 120, And the enclosed 140 is screwed and fixed in the screw hole 104a formed in the center of the outer end of the aluminum block 104 of the arrester core 110 and connected to the ground wire,  Insulation for the transmission line cable junction box, characterized in that the lightning arrester core 110, the flame-retardant resin layer 130, the pressure-pressure pipe 120 and the rubber layer 160 is left over the outer portion of the enclosed 140. Barrel Protector. According to claim 1, wherein the outer circumferential surface of the pressure relief pipe 120 is formed with a plurality of through holes (120a) insulated tube protective device for a transmission line cable junction box According to claim 1 or 2, Threaded portion formed on the outer circumferential surface of the copper rod 140 so as not to loosen the copper rods 140 respectively screwed in each of the screw holes 104a formed in the center of the outer end of the aluminum block 104 Insulation tube protector for power line cable connection box characterized in that the nut 150 is screwed together via a spring washer 152 on the 140a. delete  An aluminum block molding and zinc oxide cylinder molding step of forming the zinc oxide cylinder 102 by injecting aluminum block molding and zinc oxide powder into a mold; A leaf spring mounting step of inserting the leaf spring 105 into the receiving groove 104b formed in the inner surface of the aluminum block 104; The leaf spring 105 mounted in the receiving groove 104b of the aluminum block 104 in the placing step abuts on both ends of the zinc oxide cylinder 102 formed in the zinc oxide cylinder forming step, respectively. In the state, the outer surface of the aluminum block 104 is pressed toward the zinc oxide cylinder 102 side with a force of 300 kgf to 500 kgf, respectively, and the circular concave surface 104c of the aluminum block 104 and the zinc oxide source. An arrester core manufacturing step of winding the plastic impregnated glass fiber thread on the outer circumferential surface of the main body 102 to manufacture the arrester core 110; Lightning arrester core 110 manufactured in the arrester core manufacturing step of the lightning arrester core 110 at a predetermined interval on the inner circumferential surface of the pressure-proof pipe 120 formed with a through hole (120a) formed at a predetermined interval on the outer peripheral surface Core excretion step, Injecting a flame-retardant resin solution in a circular space formed between the outer peripheral surface of the arrester core 110 and the inner peripheral surface of the pressure-proof pipe 120 concentrically disposed in the pressure-proof pipe 120 in the arrester core excretion step 100 ℃ to A flame-retardant resin layer forming step of forming a flame-retardant resin layer 130 by heat curing at a temperature of 200 ° C., After forming the flame retardant resin layer 130 between the outer circumferential surface of the arrester core 110 and the inner circumferential surface of the pressure-proof pipe 120 in the flame retardant resin layer forming step, the outer side of the aluminum block 104 of the arrester core 110 An enclosed screwing step of screwing and fixing the encapsulation 140 into the screw holes 104a respectively formed at the center of the end portion; The pressure pipe 120 receives the pressure and at the same time ejects the pressure to the hole 120a to prevent destruction of the zinc oxide cylinder of the arrester core to prevent damage to human life and fire, and to the outside of the enclosed 140. A method of manufacturing an insulation tube protection device for a cable connection box comprising a rubber layer covering step of leaving a portion covered with a rubber layer (160).

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