KR20180087074A - Thermochromic connector made of fire-resistant new material - Google Patents

Abstract

The present invention relates to a thermo-sensitive discoloring straight-line connecting material made of a flame retardant new material. The thermo-sensitive coloring straight-line connecting material is formed as a cylindrical body (Y) having a central portion thicker than both ends thereof and having a hollow portion (X) therein in order to mutually connect power cables (K) linearly, wherein the hollow portion (X), in which a shear bolt type sleeve (S) for connecting the cables (K) in the hollow portion (X) is located, is expanded. The thermo-sensitive discoloring straight-line connecting material is formed of a flame retardant new material comprising: an inner semiconductor layer (100) forming a central portion of an inner surface of the cylindrical body (Y); an outer semiconductor layer (200) forming an outer surface of the cylindrical body (Y); an insulating layer (300) formed between the inner semiconductor layer (100) and the outer semiconductor layer (200); and thermo-sensitive discoloring pads (400) formed in the outer semiconductor layer (200) in the form of a strip in the longitudinal direction at predetermined intervals. The presence or absence of abnormality of the straight-line connecting material can be easily identified and determined by using thermo-sensitive discoloring. The straight-line connecting material is made of a flame retardant material to be excellent in waterproof properties and improve heat resistance, thereby preventing a fire or the like due to an abnormality of the straight-line connecting material. An assembled straight-line connecting material housing is expanded in a self-contracting type to simplify the structure, and constructability is improved to reduce the cost of the straight-line connecting material. Thus, the straight-line connecting material can be excellent in economics, can be stably used for a long period without a failure, and has a long life.

Description

TECHNICAL FIELD [0001] The present invention relates to a thermochromic connector made of a fire-resistant new material,

More particularly, the present invention relates to a thermosensitive coloring straight line connecting member, and more particularly, to a thermosensitive coloring straight line connecting member which is made of a silicone material having excellent heat resistance and is expanded into a self-shrinking type, thereby realizing not only waterproofness and workability but also flame retardancy, The present invention relates to a thermosensitive coloring straight line connecting member made of a flame retardant new material capable of easily identifying and determining the presence or absence of an abnormality of a thermosensitive coloring line.

As we all know, electricity is an essential energy for life that is used throughout various industrial fields. It uses two strands of wires to use electricity. It cuts wires as an essential means in the process of using wires, It is inevitable to use it.

A method of connecting two wires in a conventional manner as described above is as follows. The wire is peeled off with a tool such as a stripper at the end of the wire, and the two strands are twisted with each other such as + and - And the connecting work was completed. A separate synthetic resin insulation cap was placed on the insulating tape to connect the wires.

In such a case, the cable connection site is not clean, and it takes a lot of time to cover the tape when the cable is connected and to cover the synthetic resin insulation cap.

In addition, there has been a lot of clogs such as peeling of the synthetic resin insulation cap at the connection portion or loosening of the tape due to shortening of the connection portion or short circuit at the connection portion by the tape and the synthetic resin insulation cap over time.

In order to solve the above-mentioned disadvantages, a connector for connecting a wire is commercially available. Typically, a synthetic resin insulator cover having a turn piece formed on the outer circumferential surface thereof is provided with a fastening coil. When the two wires are connected, And is fastened and fixed by a coil.

In the case of such a configuration, it is possible to maximize the speed accuracy and reliability according to the wire connection.

However, since the coupling coil is directly built into the synthetic resin insulation cover having the protruding piece formed on the outer circumferential surface with the synthetic resin as described above, when the two coupling wires are connected, the coupling coil is inflated and the synthetic resin insulation cover is damaged Or when the wire connection portion is pressed from the outside, the synthetic resin insulation cover and the fastening coil are damaged.

As a conventionally developed technology in view of the above-described circumstances, Japanese Patent No. 1032733 discloses a " connector for wire connection "

As shown in FIG. 1 and FIG. 2, the connector for wire connection of the above-mentioned Japanese Patent No. 1032733 includes a fastening coil 1, a metal protective cap 10, a projecting piece 30, And a synthetic resin insulation cover 20 in which a protruding protrusion 31 is formed. The main body 2 of the coupling coil 1 is threaded so that the connected portion of the wire is twisted, And the head portion 3 is formed in a rectangular shape so as not to rotate when the metal cap is coupled to the metal protective cap so that a head portion And the lower portion of the coupling coil is engaged with the lower end of the metal protection cap 10 so that the coupling coil is not pulled out from the metal protection cap 10. The coupling coil 1, The upper portion of the metal protective cap 10, which is loaded, is connected to the synthetic resin insulation cover 20 The metal protection cap 10 is formed on the upper side of the synthetic resin insulation cover 20 so as to have the same shape as the head of the metal protection cap, The synthetic resin insulation cover and the fastening coil can be prevented from being damaged by internal and external pressures.

However, the "connector for wire connection" of the above-mentioned Japanese Patent No. 1032733 does not have a means for diagnosing deterioration of the connector for wire connection deteriorated due to use for a long period of time, that is, deterioration of connection material, line aging, The degree of deterioration of the connector can not be easily measured.

As a conventional technique, a "power cable connecting apparatus" of Patent Publication No. 2014-0062930 is disclosed in the patent document.

As shown in FIG. 3, the "power cable connecting device" of the above-mentioned Patent Publication No. 2014-0062930 has a ball 11 at one end and a wire 15 inserted at the other end and fixed by a bolt 15 A first connecting means 10 having a wire insertion portion 13 and a ball engaging portion 21 which is inserted into the ball 11 of the first connecting means 10 so as to be rotatable And a second connecting means 20 having a wire insertion portion 23 to which the wire 3 is inserted and the bolt 15 can be fixed to the other end of the first connecting means 10, The power cable connecting device is configured to be able to communicate with the electric wire inserted into the electric wire inserting portion 23 of the second connecting means 20 from the electric wire inserted into the electric wire connecting portion 13 so as to prevent the electric wire from being bent So that the wire can be protected.

However, the above-mentioned "power cable connecting device" of the above-mentioned Patent Publication No. 2014-0062930 does not have a means for diagnosing deterioration of the power cable connecting device such as deterioration of connection materials and line aging or failure due to long- There is a problem that it can not be easily understood.

On the other hand, in power transmission lines or distribution lines, it is necessary to use power cables because underground lines are installed according to various operational needs, and power cables are manufactured to a length of about 300 to 500 m due to manufacturing and transportation restrictions .

The underground line is a line to transmit electric power by installing a power cable in the underground. In Korea, for the first time, a 22kV underground railway line was constructed between Ahn Hyundai in Seoul in 1929 and a 345kV underground transmission line was installed in Seoul .

The above-mentioned underground line is mainly constructed in a place where the processing line is technically difficult, in a busy area in the center of a large city, in a critical area required for security, and in a large apartment complex. Most of them are buried beneath the road. In general, there are direct type, duct type, power outage type and bridge type, and the method to be applied is selected considering the place of installation and various advantages.

The power line underground project is a project to dismantle the processing distribution line that hurts the beauty of the city and to install the line in the ground. It is a project to improve the complex cityscape, power capacity expansion, And the area where habitat natural disaster such as typhoon and salt spill occurs), and the processing distribution line is always exposed to the risk of safety accident. Therefore, the undergroundization of the processing distribution line is a global trend and is steadily increasing It is true.

In underground construction, it is necessary to deal with terminal end of cable, connection between cables, and connection with electric power equipment. The cable connection material used here requires electrical characteristics of the same performance as the corresponding electric power cable, Electrical accidents can be caused, and it becomes very important to install a professional cable connection material to the underground line.

In advanced economies, we are introducing silicon-based connecting materials that are eco-friendly due to environmental friendliness and reduced emission of CO2. In addition to the assembled connecting materials manufactured by EPDM (Ethylene Propylene Diene Monomer) The specifications of self-shrinkable joint materials using silicon have been separately revised.

For this reason, foreign companies such as 3M and Raychem are supplying monopoly to KEPCO. In order to cope with this situation, it is required to develop a cable termination and a straight connection port using liquid silicone which is an environmentally friendly material.

In addition, as a result of analysis of 22.9kV CN-CV cable and connection port in Korea, 69% of the number of accidents was broken and 31% was analyzed as failure of cable. The installation of the connection port and the installation of the cable should be performed well.

In addition, the connection ports used in Korea are similar in terms of insulation design standards, but the material, structure, and construction method of the connection ports are different for each manufacturer, and when the deterioration tendency of the connection ports or the breakage of the connection ports due to such differences in materials, Each fracture site and cause of fracture have different tendencies.

In summary, the failure rate due to the compression failure of the sleeve is the largest percentage, but it is presumed that the misjudgment caused by the melting phenomenon occurring during the failure point location search is included. Defects such as poor tape winding, pore generation due to bending, defective pencil sharpening, defective removal of half-layer, insulator damage, tube heating failure, and pore generation due to foreign matter penetration.

As a conventional technique for detecting defects caused by the connection port of the underground cable, there is a method of measuring insulation resistance, DC leakage, partial discharge, DC withstand voltage, AC test, OSW (Oscillating Wave), IRC (Isothermal Relaxation Current) VLF (Very Low Frequency) measurement, and partial discharge sensor measurement.

However, the above-described conventional techniques are incapable of detecting defects such as clean voids and cuts generated in the cable in the case of the DC test, detrimental to the performance of the cable in which the water tree phenomenon occurs, In the case of frequency test, the equipment is heavy and expensive, it is impossible to judge the state of the insulator, and IRC (Isothermal Relaxation Current) The reliability of the diagnosis result is low and the measurement time is long.

In addition, since the linear connection port is made of general organic rubber and has insufficient heat resistance, it can not withstand high heat or fire.

Patent Document 1: Registration No. 1032733 Patent Document 2: Japanese Patent Application Laid-Open No. 2014-0062930

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and has been made to solve the various drawbacks and problems caused by the conventional straight line connecting material, and it is an object of the present invention to provide a flame retardant new material capable of easily discriminating and determining the presence / Thereby providing a straight line connecting member for a temperature sensitive discoloration.

Another object of the present invention is to provide a thermally sensitive discoloration straightening member made of a flame retardant new material which is made of a flame retardant material and excellent in waterproofness and excellent in heat resistance performance and does not cause fire or the like due to abnormality of a straight line connecting material.

It is a further object of the present invention to provide a method of expanding an assembled type linear connecting material housing to a self-contracting type, which not only simplifies the construction but also improves the workability and reduces the cost of the linear connecting material. Which is made of a flame retardant new material having a long life.

In order to achieve the above-mentioned object, the thermo-sensitive coloring straight connecting member made of the flame retardant new material according to the present invention includes a cylindrical body Y having a hollow portion X in a central portion thereof, And a hollow portion (X) in which a shear bolt type sleeve (S) for connecting the cable (K) in the hollow portion (X) is enlarged; An inner semiconductor layer (100) forming a central portion of an inner surface of the cylindrical body (Y); An outer semiconductor layer 200 forming an outer surface of the cylindrical body Y; An insulating layer 300 formed between the inner semiconductor layer 100 and the outer semiconductor layer 200; And a thermochromic discoloration band 400 formed in the outer semiconductor layer 200 in a strip shape along the longitudinal direction at a predetermined interval.

An object of the present invention is to provide a linear connecting material which can easily identify and determine the presence or absence of an abnormality in a linear connecting material due to the discoloration due to thermal deterioration and is excellent in waterproof property and excellent in heat resistance, , And the assembly type linear connecting material housing is expanded to the self-shrinking type. In addition, since the construction is simple and the workability is improved, the cost of the linear connecting material can be reduced, and the economical efficiency is excellent. There are advantages.

1 is a perspective view of a conventional wire connecting connector,
2 is a cross-sectional view of a conventional wire connecting connector,
3 is a conceptual diagram of an embodiment of a conventional power cable connecting apparatus,
4 is a cross-sectional view of the thermosensitive coloring straight line connecting member made of the flame retardant new material of the present invention,
FIG. 5 is a sectional view of a thermosensitive coloring straight line connecting member made of a flame retardant new material according to the present invention,
6A to 6C are diagrams showing the color change of the thermosensitive coloring linear connecting material made of the flame retardant new material according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, referring to the accompanying drawings, a preferred embodiment of the thermosensitive coloring straight line connecting member made of the flame retardant new material of the present invention will be described in detail.

Fig. 4 is a cross-sectional view of the thermosensitive coloring straight line connecting member made of the flame retardant new material of the present invention, Fig. 5 is a sectional view of the thermosensitive coloring straight line connecting member made of the present invention's flame retardant new material, The thermosensitive coloring straight line connecting member made of the flame retardant new material according to the present invention has a hollow portion X having a hollow portion X in the central portion thereof, (X) in which a shear bolt type sleeve (S) is formed, the sheath bolt type sleeve (S) connecting the cable (K) in the hollow part (X); An inner semiconductor layer (100) forming a central portion of an inner surface of the cylindrical body (Y); An outer semiconductor layer 200 forming an outer surface of the cylindrical body Y; An insulating layer 300 formed between the inner semiconductor layer 100 and the outer semiconductor layer 200; And a thermochromic discoloration band 400 is formed in the outer semiconductor layer 200 at predetermined intervals along the longitudinal direction.

The use of a flame-retardant silicone rubber containing a conductive material such as metal or carbon as the inner semiconductor layer 100 and the outer semiconductor layer 200 is superior to the use of natural rubber in ozone resistance, chemical resistance, weather resistance, And heat resistance.

As the insulating layer 300, it is preferable to use a flame-retardant silicone rubber which is an insulator because it has superior ozone resistance, chemical resistance, weather resistance, insulation strength and heat resistance as compared with the case of using natural rubber.

Silicone rubber having an insulation strength of 20 to 30 kV / mm is preferably used as the flame-retardant silicone rubber used for the insulation layer 300.

The thermosensitive coloring pad 400 is formed by mixing a thermosensitive pigment with silicon and injection-molding the external semiconductor layer 200 in a strip shape along the longitudinal direction at an interval of 90 degrees around the cylinder by injection molding. Pigment is preferably used.

The straight line connecting member of the present invention is preferably a self-shrinking type having an inner diameter of Φ30 to Φ34, a diameter of inner diameter of 45 to Φ51 and an expansion ratio of 150%.

Experimental Example  One

The characteristics of the silicone rubber are compared with the characteristics of the natural rubber to see whether the inner semiconductor layer 100, the external semiconductor layer 200, and the insulating layer 300 are suitable for the material of the silicone rubber.

Comparison of properties between silicone rubber and natural rubber       characteristic        unit Silicone rubber
(VMQ) Natural rubber
(NR)    Applicable temperature range         ℃     -70 to 200      -40 to 60      The tensile strength         Mpa       3 to 11        7 to 28         Elongation          %         400+      100 to 600       Ozone resistance      Excellent          Bad       Chemical resistance         Good          Bad        Weatherability      Excellent          Fair       Insulation strength      Excellent          Bad        Heat resistance      Excellent          Bad

As can be seen from Table 1, it was confirmed that silicone rubber exhibits excellent heat resistance over a wide temperature range as compared with natural rubber. Particularly, the silicone rubber has excellent physical properties for a long period of time at a high temperature of 200 ° C. and can withstand an exposure temperature of 350 ° C. in the case of a short-time exposure. In the present invention, the semiconductor layer 100, the external semiconductor layer 200, It was confirmed that the use of the silicone rubber as the material was suitable.

Experimental Example  2

The characteristics of the conductive silicon rubber used as the semiconductor layer 100 in the present invention and the external semiconductor layer 200 and the characteristics of the insulating silicone rubber used as the insulating layer 300 are shown in Table 2 below.

Characteristic comparison between conductive silicone rubber and insulating silicone rubber           division In the insulating layer 300,
(Insulating silicone rubber) The inner and outer semiconductor layers 100,
(Conductive silicone rubber)  Flammability rating  UL 94 Listing        V-O             V-O  Plasticity  Williams Plasticity        200             410  importance Density (g / cm ³ ) @ 23 ° C        1.45           1.18 @  Contraction ratio  Linear Shrinkage (%)        2.8             3.4  Hardness  Hardness (Shorea)        55             60  The tensile strength  Tensile Strength (Mpa)        7.0             5.0  Elongation  Elongation (%)        420             320  Cutting strength  Teat Strength (N / mm)        25             18  Insulation strength Dielectric Strength
(kV / mm)
25
-  Volume resistivity  Volume Resistivity (Ω cm)     4 x 10 (15)              5  Heat aging  Heat-Aging  72h / 250 ℃ in hot air     96h / 250 ° C in hot air

As can be seen from Table 2, the UL94 flame retardant grade V-O exhibited flame retardant performance satisfying the vertical flame test and was confirmed to be suitable as a material for the thermochromic color straightening material made of the flame retardant novel material of the present invention.

Meanwhile, by using the shear bolt-type sleeve (S) for the heat-sensitive discoloration straightening member made of the flame retardant new material of the present invention, it is possible to reduce the damage inside the product and to provide ease of installation at the time of moving the housing, and the outer diameter of the cable insulation layer and the shear bolt type sleeve (Interface pressure) of the cable external semiconductor layer 200 is eliminated and the electric field concentration phenomenon is alleviated, as well as the difficulty of the construction in the winter season can be solved have.

For convenience of explanation, the case where the shear bolt type sleeve S is used has been described, but a general sleeve may also be used.

As shown in FIGS. 6A to 6C, the thermosensitive coloring straight line connecting member made of the flame retardant new material according to the present invention easily identifies the deteriorated state of the linear connection material and the poor state of construction by the color change of the thermosensitive coloring pad 400, It can be judged.

While the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not limited thereto and that various changes and modifications may be made therein without departing from the scope of the invention.

100: inner semiconductor layer 200: outer semiconductor layer
300: insulating layer 400: thermal decolorization band
K: Cable X: Hollow portion
Y: Cylindrical body

Claims (7)

In order to connect the electric power cables K to each other in a mutual linear manner, the central part is formed of a cylindrical body Y having a hollow part X in a thick inside thereof and has a front end connecting the cable K in the hollow part X A heat-sensitive discoloration straightening material in which a hollow portion (X) where a bolt-type sleeve (S) is located is expanded; An inner semiconductor layer (100) forming a central portion of an inner surface of the cylindrical body (Y); An outer semiconductor layer 200 forming an outer surface of the cylindrical body Y; An insulating layer 300 formed between the inner semiconductor layer 100 and the outer semiconductor layer 200; And a thermochromic discoloration band (400) formed in the outer semiconductor layer (200) in the form of a band along the longitudinal direction at a predetermined interval. The thermo-sensitive discoloration linear connection material according to claim 1, wherein the inner semiconductor layer (100) and the outer semiconductor layer (200) are a flame-retardant silicone rubber combined with a conductive material of metal or carbon. The thermosensitive coloring straight connecting material according to claim 1, wherein the insulating layer (300) is a flame-retardant silicone rubber which is an insulator. The thermosensitive coloring linear connecting material according to claim 3, wherein the flame-retardant silicone rubber used as the insulating layer (300) has an insulation strength of 20 to 30 kV / mm. The thermo-sensitive coloring pad (400) according to claim 1, wherein the thermosensitive coloring pad (400) is formed by mixing a thermosensitive pigment with silicon and injecting the thermosensitive coloring material into the external semiconductor layer (200) Features a straight-line connecting material with heat-sensitive discoloration made of flame retardant new material. The thermosensitive coloring linear connecting material according to claim 5, wherein the thermosensitive pigment is a cyan pigment. The linear connecting material as set forth in claim 1, wherein the linear connecting material is a self-shrinking type and has an internal diameter of Φ30 to Φ34 and an internal diameter of 45 to Φ51.

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