WO2005086181A1

WO2005086181A1 - Polymer wire post insulator

Info

Publication number: WO2005086181A1
Application number: PCT/KR2005/000565
Authority: WO
Inventors: Chul Woong Park
Original assignee: Chul Woong Park
Priority date: 2004-03-10
Filing date: 2005-02-28
Publication date: 2005-09-15
Also published as: KR20050090901A; KR100516992B1

Abstract

The present invention provides a polymer line post insulator having a structure capable of fixing overhead wires to a power transmission tower or an electric pole in optimum state. There is provided a polymer wire post insulator, comprising a housing, a core, a base metal fitting, and a head that has a wire guide groove formed in a concave shape in a semi circular shape in a direction that an overhead wire is placed, and first and second wire clamps with rectangular shapes are formed in an upper side of both sides of the wire guide groove in a longitudinal direction.

Description

Description POLYMER WIRE POST INSULATOR Technical Field

[1] The present invention relates to an insulator capable of clamping an overhead wire to a power transmission tower or an electric pole, and in particular to a polymer wire post having a structure capable of clamping an overhead wire in an optimal manner.

[2] Background Art

[3] Conventionally, in order to clamp a power cable (power transmission wire) to a power transmission tower or an electric pole, an insulator is generally used for insulating purposes, and for physically maintaining or supporting the power cable, and this insulator is formed of an insulation material. The above insulator is capable of increasing the distance based on surface area by forming a plurality of skirts, thereby electrically achieving enough electrical insulation property. When the surface is wet, in particular when salt components or dusts are attached to the surface, a decrease in insulation power frequently occurs. Generally, the insulator is formed of porcelain, with porcelain as the main material, which has excellent insulation properties, and does not tend to change in quality over time, and a desirable strong mechanical property is obtained under a certain environments, such as a temperature change, sunlight, etc.

[4] Recently, a wire post insulator was developed wherein Ethylene Propylene Diene Terpolymer (EPDM) and a skirt housing of a silicon material and a wire arrival head of epoxy resin material is compressed and attached to a core of a fiberglass reinforced plastics (FRP). As an example of the wire post insulator, there is the Korean utility model registration No. 20-0329989 dated May 2, 2003 (wire post insulator — applicant is Jaeryong industrial corporation).

[5] However, in the case that the insulator is formed of a material such as a solid porcelain, etc., water repellency is decreased by even small damage to the insulator, resulting in an increase surface leakage, and an insulation accident thus occurs. In addition, the insulation property is decreased because an overhead wire is fixed to the upper side of the insulator using a binder such as a metallic plate and bolt, etc.

[6] In addition, the Korean utility model registration No. 20-0313571 is capable of overcoming the problems that the leakage current of the insulator of solid porcelain is increased. In the above Korean utility mode, the overhead wire laid on the upper side of the insulator is fixed using an additional binder. Namely, in order to fix the overhead wire to the insulator, the work processes of the overhead wire is complicated because a wire binder insulated and coated on the metallic cable is used. Therefore, the conventional art is achieved in a structure that the overhead wire placed on the insulator is fixed using the binder. Therefore, the insulation property, salt resistance, climate resistance and tracking-proof are decreased. Disclosure of Invention Technical Problem

[7] Accordingly, it is a feature of the present invention to provide a polymer post wire insulator having a structure capable of achieving maximum insulation property, salt resistance and tracking-proof property in maximum.

[8] It is another feature of the present invention to provide a polymer post wire insulator having a structure in which an overhead wire placed on the upper most places is easily fixed.

[9] To achieve the above features/ objectives, there is provided a polymer wire post insulator, comprised of a housing having a hollow part wherein a plurality of skirts with different sizes are stacked on an outer portion of the same; a core engaged to the hollow part in such a manner that it protrudes from the upper and lower side of the housing by a certain length; a base metal fitting in which a metal fitting fixed to an electric pole is inserted into a lower side of the same, wherein said based metal fitting has a groove into which a lower protrusion of the core is inserted, and is engaged to a lower side of the core; and a head that has a wire guide groove formed in a concave shape in a semi circular shape in a direction that an overhead wire is placed, and first and second wire clamps with rectangular shapes are formed in an upper side of both sides of the wire guide groove in a longitudinal direction.

[10] In the above construction, the housing and head are formed of a polymer resin, for example, a material such as EDPM, silicon, epoxy, etc. for thereby enhancing surface water repellency, ozone resistance, washing property, climate resistance, tracking- proof, etc.

[11] The core is preferably formed of an FRP impregnated in a polymer resin or a conventional FRP material for thereby enhancing the electrical, mechanical and thermal properties.

[12] The base metal fitting is preferably fabricated in such a manner that a nut is molded with a polymer resin such as EDPM, silicon, epoxy, etc. for thereby fixing a bolt to an electric pole.

[13] The head includes a wire binding prop that is extended in a first direction so that a wire guide groove is formed by a certain length, and a plurality of binding holes passing through the lower side at both sides of the guide groove are formed in the inner and outer sides wherein the clamp prop is extended in a direction crossing with the wire binding prop. [14] A movement blocker is further provided in the interiors of the first and second wire clamps formed in the upper side in a longitudinal direction of both sides of the wire guide groove of the wire-binding prop in such a manner that the depth of the wire guide groove is deeper.

[15] The length LI of the first wire clamp is longer than the length L2 of the second wire clamp, and the thickness of the first wire clamp is thinner than the thickness T2 of the second wire clamp, so that the flexibility of the first wire clamp is better than the second wire clamp.

[16] The above construction is made for the purposes that the first wire clamp is bent in a shape of surrounding the second wire clamp when the first wire clamp and second wire clamp are crossed with each other in a state that the overhead wire is placed in the wire guide groove for thereby binding the overhead wire placed on the upper side of the wire guide groove.

[17] In addition, in the binding holes formed at both sides of the wire guide groove, the overhead wire placed on the upper side of the wire guide groove is more strongly tied using a tie line.

[18] In the polymer line post insulator according to the present invention, the overhead wire is placed in the wire guide groove formed in the head. The first and second wire clamps are crossed with each other. The overhead wire placed in the wire guide groove is first tied. The overhead wire is second tied by inserting a tie line into the binding holes formed at both sides of the wire guide groove for thereby minimizing the leakage current by the binding elements. Brief Description of the Drawings

[19] The preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[20] Figure 1 is a perspective view of a polymer wire post insulator according to a preferred embodiment of the present invention;

[21] Figure 2 is a front view illustrating a polymer wire post insulator of Figure 1;

[22] Figure 3 is a plane view illustrating a polymer wire post insulator of Figure 1 ;

[23] Figure 4 is a cross sectional view taken along wire p-p' of a polymer wire post insulator of Figure 1 ; and

[24] Figure 5 is a view illustrating a state of use of a polymer wire post insulator of Figure 1.

[25] Best Mode for Carrying Out the Invention

[26] The preferred embodiments of the present invention will be described with reference to the accompanying drawings. [27] As shown in Figures 1 through 4, the polymer wire post insulator according to the present invention includes a housing 18, a core 20 engaged to a hollow of the housing 18, a base metal fitting 23 engaged to a lower protrusion of the core 20, and a head 34 engaged to the upper protrusion of the core 20.

[28] The housing 18 of the polymer wire post insulator 10 according to the present invention is formed of an EDPM or silicon material. A plurality of skirts 16 are formed wherein skirts 12 and 14 of different sizes are stacked on an outer surface with hollows. Here, the housing is fabricated in such a manner that a certain material such as a polymer resin EDPM, silicon, epoxy, etc. is injected and molded. Here, the polymer resin is used for achieving an excellent surface water repellency, ozone resistance, washing property, climate resistance and tracking-proof. At this time, the number of the skirts is determined based on the permissible values of the leakage current for thereby increasing the surface insulation length. A proper number of the same is needed.

[29] The core 20 inserted into the hollow of the housing 18 is formed of a FRP impregnated in a polymer resin or a common FRP is injected and molded and is extended to have a certain length in an upper side or lower side of the housing 18. At this time, it is needed that cracks and foams are not formed in the core 20. When the core 20 is engaged to the hollow of the housing 18, an adhesive of silicon material is applied to the outer surface of the core 20, so that an interface between the housing 18 and the core 20 is intensively adhered.

[30] As shown in Figure 4, a metallic nut is molded in the core 20 protruded toward the lower side of the housing 18 and is inserted into a groove 32 of the base metal fitting 23 having a certain step in the upper side of the same. At this time, it is preferred to apply a polymer adhesive on an outer surface of the protrusion of the core 20 before the protrusion of the core 20 is engaged to the groove 32 of the base metal fitting 23. It is needed that the foams are not formed.

[31] As shown in Figure 4, in the core 20 protruded toward the upper side of the housing 18, a wire guide groove 24 is provided in an upper side of the same. It is inserted into an insertion groove 22 formed in the lower side of the head 24 having first and second clamps 26 and 28 upwardly extended from both sides of the wire guide groove 24. At this time, the insertion groove 22 of the head 24 has a step portion in the lower side so that the interface is enough achieved between the upper protrusion of the core 20 and the head 24. When they are engaged, it is preferred to apply a polymer adhesive to an outer surface of the protrusion of the core 20. It is needed that the foams are not formed.

[32] The construction of the head 24 will be described with reference to Figures 1 and 3.

[33] The head 24 of the polymer wire post insulator 10 according to the present invention includes a wire binding prop 33 extended in a first direction, for example, in a vertical direction, and a clamp prop 31 extended in a direction crossing with the wire binding prop 33. The wire binding prop 33 and the clamp prop 31 are formed in a shape 30 that the skirts are divided. The thickness of the same is larger than the thickness of the skirt 18 for thereby maximizing the length of the insulation.

[34] A wire guide groove 24 is formed in the center of the wire-binding prop 33 in a semicircular shape in a longitudinal direction. First and second wire clamps 26 and 28 each having a rectangular ring shape in a longitudinal direction are provided on the upper side of both sides of the wire guide groove 24. In the interiors of the first and second wire clamps 26 and 28, movement blockers 37 and 39 are extended in the direction of the clamp prop 31, starting from both edges of the wire guide groove 24. The movement blockers 37 and 39 have a deeper depth as compared with the depth of the wire guide groove 24 for thereby preventing an escape from the wire when the overhead wire is placed in the wire guide groove 24.

[35] The length LI of the first wire clamp 26 extended from the upper side of the wire binding prop 33 in a rectangular ring shape is longer than the length L2 of the second wire clamp 28 formed in the same shape near the wire guide groove 24. The thickness TI of the first wire clamp 26 is thinner than the thickness T2 of the second wire clamp 28. In addition, the thickness T2 of the second wire clamp 28 is getting thicker in the direction from the upper side to the lower side. The length LI and L2 and the thickness LI and L2 of the first and second wire clamps 26 and 28 are different for the reasons that the first wire clamp 26 is needed to have a more flexible property as compared with the second wire clamp 28. The first and second wire clamps 26 and 28 are bent in the shape that the first wire clamp 26 surrounds the second wire clamp 28 in a state that the overhead wire is placed in the wire guide groove 24 for thereby engaging the overhead wire placed on the upper side of the wire guide clamp 28 formed in the center of the same.

[36] In addition, a plurality of vertically passing binding holes 35 are formed in the edge of the wire binding prop 33. The binding holes 35 are formed of a synthetic resin, namely, a tie line or a binding wire fabricated in such a manner that the flexibility is enhanced, for thereby more strongly binding the overhead wires placed on the upper side of the wire guide groove 24.

[37] The head 34 of the polymer pine post insulator 10 according to the present invention is fabricated in such a manner that a polymer resin, for example, a material such as EDPM or silicon, epoxy, etc. is injected and molded for thereby enhancing a surface water repellency, ozone resistance, washing property, climate resistance, tracking-proof, etc.

[38] The polymer wire post insulator 10 according to the present invention is used in a state that the base metal fitting 23 is fixed to an arm brace fixedly installed at the electric pole by a conventional method. The first wire clamp 26 is crossed in the upper side of the second wire clamp 28 in a state that the overhead wire 38 is disposed on the wire guide groove 24 formed in the wire binding prop 33 of the insulator head 34 as shown in Figure 5, so that it is possible to easily bind the overhead wire 38 placed on the upper most portion of the head 24. In addition, as shown in Figure 5, a tie line is inserted into the binding holes 35 passing through the left and right sides of the wire guide groove 24 for thereby binding the overhead wire 38 one more time for thereby stably binding the overhead wire. Therefore, it is possible to achieve a more stable installation of the overhead wire as compared with the engagement by the binding wire.

[39] In the above preferred embodiments of the present invention, the first and second wire clamps are formed on the upper side of the wire binding prop having the wire guide grooves, and a plurality of binding holes are formed. The wire clamps and binding holes can selectively adapt the binding holes.

[40] Industrial Applicability

[41] As described above, the wire guide groove in which the wire is placed is formed deeper in the insulator head for thereby achieving an easier placement of the overhead wire. The wire clamps are crossed at both sides of the wire guide groove for thereby binding the overhead wire, so that it is possible to achieve an easier installation of the overhead wire. In addition, additional binding holes are formed in the wire binding prop in which the wire guide grooves are formed for thereby binding the overhead wire second times, so that it is possible to achieve more stable state as compared with the overhead wires.

[42] As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described examples are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

[43]

Claims

[1] A polymer wire post insulator, comprising: a housing having a hollow part wherein a plurality of skirts with different sizes are stacked on an outer portion of the same; a core engaged to the hollow part in such a manner that it is protruded from an upper and lower side of the housing by a certain length; a base metal fitting in which a metal fitting fixed to an electric pole is inserted into a lower side of the same, wherein said based metal fitting has a groove into which a lower protrusion of the core is inserted, and is engaged to a lower side of the core; and a head that has a wire guide groove formed in a concave shape in a semi circular shape in a direction that an overhead wire is placed, and first and second wire clamps with rectangular shapes are formed in an upper side of both sides of the wire guide groove in a longitudinal direction.

[2] The insulator of claim 1, wherein said housing and head are injected and molded with a polymer resin such as EDPM or silicon.

[3] The insulator of either claim 1 or claim 2, wherein said core is injected and molded with FRP or FRP impregnated in polymer resin.

[4] The insulator of claim 1, wherein said head includes a wire binding prop that is extended in a first direction so that the wire guide groove is formed by a certain length, and a plurality of binding holes passing through the lower side at both sides of the guide groove are formed in the inner and outer sides of the first and second wire clamps, and a clamp prop extended in the direction crossing with the wire binding prop.

[5] he insulator of claim 4, further comprising a movement blocker formed in the interiors of the first and second wire clamps formed in the upper side in a longitudinal direction of both sides of the wire guide groove of the wire binding prop for thereby preventing an escape of the wire by forming the wire guide groove to be deeper.

[6] The insulator of either claim 4 or claim 5, wherein the length LI of the first wire clamp is longer than the length L2 of the second wire clamp, and the thickness TI of the first wire clamp is thinner than the thickness T2 of the second wire clamp, so that the flexibility of the first wire clamp is higher than the second wire clamp.

[7] A polymer wire post insulator, comprising: a housing having a hollow part wherein a plurality of skirts with different sizes are stacked on an outer portion of the same; a core engaged to the hollow part in such a manner that it is protruded from an upper and lower side of the housing by a certain length; a base metal fitting in which a metal fitting fixed to an electric pole is inserted into a lower side of the same, wherein said based metal fitting has a groove into which a lower protrusion of the core is inserted, and is engaged to a lower side of the core; and a clamp prop that has a wire guide groove formed in a concave shape in a semi circular shape in a direction that an overhead wire is placed, and a wire binding prop having a plurality of binding holes passing through the lower side at both sides of the guide groove, wherein said clamp prop is extended in a direction crossing with the wire binding prop.

[8] The insulator of claim 7, wherein said housing and head are injected and molded with a polymer resin such as EDPM or silicon.

[9] The insulator of either claim 7 or claim 8, wherein said core is injected and molded with FRP or FRP impregnated in polymer resin.

[10] The insulator of claim 9, further comprising a movement blocker being provided at an upper side of both sides of the wire guide groove of the wire binding prop and having a certain height.