JP2010016986A - Porcelain tube unit, aerial terminal-connecting section and method for assembling porcelain tube unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To preferably assemble an aerial terminal-connecting section at a site, for use at the aerial terminal-connecting section of a high-voltage power cable. <P>SOLUTION: A porcelain tube 110 is formed while separating a plurality of creases in the longitudinal direction on an outer peripheral surface. The cable 120 is arranged on approximately the axial center of the porcelain tube 110, and one end section 120a is led out from the base end section 110a side of the porcelain tube 110 to the outside. A cable conductor 121, a cable insulator 123 and an external semi-conducting layer 125 are exposed from the other end section side in the porcelain tube 110. A stress cone 130 is fitted externally to a boundary section between the cable insulator 123 and the external semi-conducting layer 125. A section among the porcelain tube 110, the cable 120 and the stress cone 130 is filled with a jelly-shaped solid insulator, and a jelly-shaped solid insulator 140 is fitted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an insulator device used in an air terminal connection unit for connecting an electric power device or an overhead power transmission line and an electric power cable disposed in a power plant, a substation, and the like, in particular, an insulator tube unit and an air terminal connection. The present invention relates to a method for assembling a section and a garment pipe unit.

  In general, a power cable such as a CV (crosslinked polyethylene insulation) cable is provided with a shielding layer (external semiconductive layer) on the insulator in order to reduce electric field stress in the insulator. When assembling such a terminal connection portion of a power cable, simply removing the shielding layer may concentrate the electric field at the end of the shielding layer, and may cause destruction of the crosslinked polyethylene as an insulator. For this reason, various measures are taken so that electric field stress is not concentrated particularly at the terminal connection portion of the high-voltage power cable.

  Examples of the air termination connection portion used as the termination connection portion used in the atmosphere include a prefabricated type (see Patent Document 1) using a pre-molded rubber stress cone (electric field relaxation insulating reinforcement layer), oil There is an oil-immersed type (see Patent Document 2) using a capacitor cone in which capacitance between thin metal foil electrodes arranged in immersion-insulated paper is appropriately distributed.

  For example, in a prefabricated aerial termination connection, in a porcelain or polymer insulator tube, a conductor lead bar is compression-connected to the end of the conductor of the power cable, and a spindle-like shape is formed on the insulator exposed by stripping. The stress cone is put on.

  The stress cone is pressed and fixed to an epoxy seat that is inserted and fixed in the lower part of the insulator tube through a compression device. The spring force of the compression device applies appropriate pressure to the interface between the epoxy seat and the stress cone and the interface between the stress cone and the cable insulator to ensure the dielectric strength. In addition, a conductor lead bar and an upper metal fitting for fixing the insulator pipe are fixed to the upper part of the insulator pipe, and an upper cover is covered so as to cover them. In the power cable, the outer shielding layer is grounded in the garment pipe.

The insulating pipe is filled with an insulating fluid such as insulating oil or an insulating gas such as SF ₆ (sulfur hexafluoride) gas as an insulating compound.

  In addition, in the oil-immersed air termination connection part, the condenser cone is used as the main insulation element at the conductor end of the power cable inserted into the porcelain or polymer insulation pipe, and the insulation is used as the insulation compound in the insulation pipe. Filled with an insulating fluid such as oil.

In particular, in the high voltage specification, these air termination connection portions are configured to fill an insulating fluid such as an insulating oil or an insulating gas such as SF ₆ (sulfur hexafluoride) gas in the insulator tube. For this reason, the conventional aerial termination connection part peels off the insulation layer of the installed power cable terminal in accordance with the length of the scoring pipe at the site, and all the components such as the stress cones at a predetermined position of the cable terminal. After mounting and covering the garment tube, it is assembled by filling the garment tube with an insulating fluid or gas.
JP 2000-261948 A JP 2003-189454 A

  As described above, in the structure of the conventional aerial terminal connection portion, in the field, cable processing processing such as stepping on the cable end portion, attachment processing of the component parts to the processed portion of the cable, and covering the cable end portion with the insulation pipe Complicated operations such as processing and processing for filling with insulating oil or insulating gas are required. Therefore, there is a desire to further simplify the assembly work on site.

  The present invention has been made in view of the above points, and is used for an air terminal connection part of a high-voltage power cable, and can be used to suitably assemble an air terminal connection part in the field. It is an object of the present invention to provide a method for assembling a connecting portion and a garment pipe unit.

  The insulator tube unit of the present invention has a cylindrical shape, and is arranged on a substantially axial center of the insulator tube, and a insulator tube made of porcelain or polymer in which a plurality of flanges are formed on the outer peripheral surface and spaced apart in the longitudinal direction. A cable with one end leading out to the outside from the proximal end side of the insulator tube, and a cable conductor, a cable insulator, and an external semiconductive layer exposed from the other end side in the insulator tube; A cylindrical stress cone which is disposed and is fitted on a boundary portion between the cable insulator and the outer semiconductive layer in the cable, and a gel-like solid insulator between the insulator tube and the cable and the stress cone. And having a gel-like solid insulator disposed in close contact with the inner wall surface of the insulator tube and the outer surface of the cable and stress cone.

  The aerial termination connecting portion of the present invention has the end portion of the cable led out from the base end portion of the insulator tube in the above-structured insulator tube unit and the power cable, and a cylindrical insulating rubber block is attached to the abutting portion. The structure which connects by covering is taken.

  An assembling method of the insulating tube unit of the present invention is an assembling method of the insulating tube unit having the above-described configuration, and inside the insulating tube made of a porcelain or polymer in which a plurality of flanges are formed on the outer peripheral surface and spaced apart in the longitudinal direction. One end portion is led out to the outside from the proximal end side of the insulation tube on the substantially axial center of the insulation tube, and a cable conductor, a cable insulator, and an external semiconductive layer are provided from the other end portion inside the insulation tube. Between the cable, the cable, and the stress cone at the boundary between the cable insulator and the outer semiconductive layer; Filling a gel-like solid insulator to form a gel-like solid insulator disposed in close contact with the inner wall surface of the stub tube and the outer periphery of the cable and stress cone. It was.

  ADVANTAGE OF THE INVENTION According to this invention, it can use for the air termination | terminus connection part of a high voltage electric power cable, and an air termination | terminus connection part can be suitably assembled in the field.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, the insulator tube unit is used for an air terminal connection part for connecting a terminal part of a power cable to, for example, a transformer, an overhead wire, a bus line of a substation, and the like.

  FIG. 1 is a cross-sectional view showing a configuration of an insulator pipe unit 100 according to an embodiment of the present invention.

  1 includes an insulator tube unit 100 for an air end connection portion, a cable 120 arranged concentrically with the insulator tube 110 in the insulator tube 110, a cable insulator 123 of the cable 120, and an external half. It has a stress cone 130 attached so as to cover the periphery between the conductive layer 125 and a cylindrical gel-like solid insulator 140 disposed in the insulator tube 110 and covering the cable 120 and the stress cone 130.

  The garment tube 110 is configured by closing the tip 110b side of the cylindrical rinsing tube main body 112 covered with an insulating jacket part 114 serving as a jacket with an upper shield 116 into which a conductor lead bar 128 is inserted. ing.

  The insulator tube main body 112 is made of a material having high mechanical strength, for example, a hard plastic resin such as epoxy resin or FRP (Fiber Reinforced Plastics). Here, the FRP cylindrical insulator tube main body 112 is made of A garment tube 110 is formed by coating with a polymer coating material as the insulating jacket portion 114.

  The polymer coating material (insulation jacket portion) 114 is formed of a material having excellent electrical insulation performance, here, a polymer material such as silicone polymer, and is provided integrally with the garment tube main body portion 112.

  Further, the insulating jacket portion 114 has a plurality of flange portions 114a arranged at predetermined intervals in the longitudinal direction on the outer peripheral portion of the insulator tube main body portion 112. One end of the insulator tube 110 is formed by the flange portions 114a. The portion (base end portion) 110a side and the other end portion (tip end portion) 110b side are prevented from being electrically short-circuited by rainwater or the like. Note that the garment tube 110 may have a configuration in which the outer peripheral surface is tapered so as to gradually expand from the distal end portion 110b side to the proximal end portion 110a side.

  In the thus formed garment tube 110, one end (power cable connecting portion) 120 a side extends from the proximal end portion 110 a of the garment tube 110 on the same axis or substantially the same axis as the axis of the garment tube 110. A cable 120 is provided in which the other end (front end) 120b side is connected to the conductor lead bar 128. The end portion 120b of the cable 120 is arranged to be electrically connected to the outside through a conductor lead bar 128 that penetrates the upper shield 116, and is electrically connected to an overhead wire or the like.

  The cable 120 is formed in the same manner as the power cable 300 (see FIG. 2) forming the air termination connection portion 200 (see FIG. 2), and at least the internal semiconductivity around the cable conductor 121 in order from the inside. A layer (not shown), a cable insulator 123, an outer semiconductive layer 125 and the like are covered.

  The cable 120 is formed in the garment tube 110 so that the cable conductor 121, the cable insulator 123, and the outer semiconductive layer 125 are exposed in a predetermined length in order from the distal end portion 110b side. A portion of the exposed external semiconductive layer 125 that leads to the outside from the bottom metal part 118 is stepped off, and the cable insulator 123 and the cable conductor 121 that are sequentially exposed toward one end of the cable 120 together with the power cable connecting portion (cable 120, one end of 120).

  The power cable connection portion 120a of the cable 120 is formed as an end portion connected by a rubber block connection insulating connection portion (Rubber Block Joint: "RBJ") using a normal temperature shrinkable rubber block insulator as a main insulation. ing. Thus, the power cable connection part 120a exposed to the outside is connected to the power cable 300 (see FIG. 2) via the RBJ.

  In the cable 120, a stress cone 130 is externally fitted between the outer peripheral surface 123 a of the cable insulator 123 and the outer peripheral surface 125 a of the external semiconductive layer 125.

  The stress cone 130 is a cylindrical elastic body, and here, mainly made of silicone rubber having a high tensile elongation rate, the inner diameter thereof is formed to be smaller than the outer diameter of the cable insulator 123 in a natural state. Yes. The stress cone 130 is a so-called normal temperature shrinkable silicone rubber end connection stress cone.

  The stress cone 130 includes a relief bellows-like stress relief cone (hereinafter referred to as “relief cone”) 131 having a low electric field portion, and a relief between the high electric field portion generated at the end of the cable 120 and the relief cone 131. And an insulator 132 that alleviates electric field stress in the creeping direction from the surface of the cone 131.

  In the relief cone 131, the inner peripheral surface is arranged so as to be separated from the axial center from the proximal end portion 110a side to the distal end portion 110b side. The relief cone 131 is in close contact with the periphery of the outer semiconductive layer 125 of the cable 120 on the base end side.

  As described above, the cable 120 in which the boundary portion between the cable insulator 123 and the outer semiconductive layer 125 is covered with the stress cone 130 is the gel-like solid insulation formed by filling the gel-like solid insulator in the stub tube 110. Covered by body 140.

  Specifically, both the surface of the cable 120 (the surface of the cable insulator 123 and the surface of the outer semiconductive layer 125), the outer peripheral surface of the stress cone 130, and the inner peripheral surface of the insulator tube 110 are in close contact with each other. Thus, the gel-like gel-like solid insulator 140 is arranged without a gap. That is, the gel-like solid insulator 140 is disposed in close contact with the inner wall surface of the potato tube 110 and the outer surfaces of the cable 120 and the stress cone 130.

  The gel-like solid insulator 140 is made of a material that has an insulating property and forms a gel state even after being cured. Here, the gel-like solid insulator 140 is made of a silicone gel material. By forming the gel-like solid insulator 140 as a silicone gel material, when the gel-like solid insulator 140 is cured to become the gel-like solid insulator 140, the interface on the inner surface side and the outer surface side against the contraction of the gel-like solid insulator 140. The silicone gel material itself can follow the force generated by the above, and the adhesion of the interface between the inner wall surface of the stub tube 110 and the outer surface of the cable 120 and the stress cone 130 can be maintained after curing. Furthermore, by using a silicone gel material, the cable insulator 123 of the cable 120 and the external semiconductive layer 125 or silicone can be used even if the surface facing the gel solid insulator 140 is a porcelain or polymer insulator 110. Even the rubber stress cone 130 can be brought into close contact regardless of the material.

  In addition, when a low temperature curing type or a room temperature curing type silicone rubber or the like is used instead of the gel solid insulator 140, the following property of the rubber material itself with respect to curing shrinkage is low. Alternatively, peeling occurs at any of the interfaces between the cable 120 and the outer surface of the stress cone 130, and a gap is formed at the boundary. The possibility of forming this gap portion must be avoided as much as possible. This is because when high voltage is applied, sparks are generated at the gaps, specifically, the inner wall surface of the insulator 110, the outer surface of the cable 120 and the stress cone 130, and the gap between the gel-like solid insulator 140, and the dielectric breakdown occurs. It is because there is a possibility of doing.

  The garment tube 110 having a gel-like solid insulator 140 therein is based on the cable 120 by a bottom metal fitting 118 having an opening through which the cable 120 is inserted in the middle of the garment tube 110 on the proximal end side of the garment tube 110. It is closed in a state of being led out from the end portion 110a.

  The garment tube unit 100 is assembled prior to transport to the site where the air termination connection is assembled. First, the cable 120 in which the conductor lead bar 128 is connected to the distal end portion 110 b side is arranged along the axis of the insulator tube 110 in the insulator tube 110. And after attaching the bottom metal fitting 118 to the base end part 110a side of the insulator pipe 110 from the power cable connecting part 120a side of the cable 120 and attaching the upper metal part 119 to the distal end part 110b side of the insulator pipe 110, The upper shield 116 is closed. The gel tube 110 is filled with a gel-like solid insulator (here, a silicone gel) to form a gel-like gel-like solid insulator 140.

  The insulation pipe unit 100 according to the present embodiment is connected to the end portion of the power cable formed by covering at least the cable insulator and the outer semiconductive layer in order from the inside to the base end portion 110a side. Form a middle termination connection. The garment pipe unit 100 has a cylindrical shape, and a garment pipe 110 in which a plurality of flanges 114a are formed on the outer peripheral surface so as to be spaced apart in the longitudinal direction, and is arranged on the same axis as the axis of the garment pipe 110 or substantially on the axis. One end portion (power cable connecting portion) 120a is led out from the base end portion 110a side of the garment tube 110, and the cable conductor 121 and cable insulation are provided from the other end portion (tip portion) 110b side in the garment tube 110. Body 123, cable 120 from which external semiconductive layer 125 is exposed, and cylindrical stress cone that is arranged in insulator tube 110 and is externally fitted to the boundary between cable insulator 123 and external semiconductive layer 125 in cable 120. 130, a gel-like solid insulator is filled between the insulator tube 110, the cable 120 and the stress cone 130, and the inner wall surface of the insulator tube 110 and the cable 120 and And a gel-like solid insulator 140 is disposed in close contact with the outer surface of the stress cone 130.

  According to the garment pipe unit 100, since the internal insulation that has been conventionally performed using oil or gas in the garment pipe 110 is performed by the gel-like gel solid insulator 140, the internal insulation itself is externally provided. There is no leakage. Thereby, it can ship, maintaining stable quality after manufacture and a test | inspection in the factory which is a controlled environment. Therefore, the on-site assembly process can be omitted and the number of on-site work steps can be reduced.

  Next, the aerial termination connection unit 200 using the garment tube unit 100 will be described.

  FIG. 2 is a partial cross-sectional view of an aerial termination connection unit 200 using the aerial termination connection garment pipe unit 100 according to the present invention.

  In the insulator pipe unit 100 shown in FIG. 2, the flange portion of the bottom metal fitting 118 is attached to the support base 204 via the support insulator 202, and the power cable connecting portion 120 a is connected to the terminal of the power cable 300 (hereinafter, “cable” Is connected to the terminal 310) via the RBJ 170.

  As a method of assembling the aerial terminal connection portion 200 using the insulator tube unit 100, first, the insulator tube unit 100 is attached to the support base 204 via the support insulator 202 disposed on the lower surface of the bottom metal fitting 118.

  Further, the RBJ 170 is mounted on the power cable 300. The cable terminal 310 is formed by stripping from the end and exposing the cable conductor 311, the cable insulator 312, and the external semiconductive layer 313 from the tip.

  In this way, the cable conductor 311, the cable insulator 312, and the cable terminal 310 with the external semiconductive layer 313 exposed are abutted against the power cable connection portion 120 a of the insulator tube unit 100, and the RBJ 170 is externally fitted to the abutting portion. It is connected.

  The RBJ 170 includes a rubber block insulator 173 having rubber-like elasticity such as silicone rubber. Specifically, the RBJ 170 has a conductor connection tube 172 that covers the butted portion of the cable conductor 121 and the cable conductor 311, and a rubber block insulator 173 is provided so as to cover the conductor connection tube 172. The rubber block insulator 173 includes stress cone portions 174a and 174b covering the outer periphery of the boundary portion between the cable insulators 123 and 312 of both cables 120 and 300 and the outer semiconductive layers 125 and 313, conductor connection pipes 172, and And a rubber insulating cylinder 176 that covers the stress cone portions 174a and 174b.

  With the RBJ 170 configured in this manner, the insulation performance of the connection portion between the power cable 300 and the insulator unit 100 is ensured.

  According to the present embodiment, the gel-like solid insulator 140 having the gel shape as the internal insulator in the insulator tube 110 and the portion connected to the laid power cable are led out from the insulator tube 110, This is a power cable connecting portion 120a capable of RBJ connection. For this reason, the insulator tube unit 100 for the air end connection part can be shipped after an electrical test in a factory or the like, and can be easily connected to the terminal part of the power cable using the RBJ and assembled by using the RBJ in the field. In addition, it is possible to improve the reliability of the quality in the aerial terminal connection part.

  In addition, when assembling at the site, the installation of the irrigation pipe unit 100 itself can be performed freely without any limitation in the installation direction.

When assembling the aerial termination connection portion 200 in this way, the only work on site is the RBJ connection work including cable processing. Therefore, unlike the structure of a conventional composite pipe-applied oil-insulated air terminal connection portion, it is not necessary to perform an operation of filling an insulating gas such as insulating oil or SF ₆ as an internal insulator inside the insulating pipe, The air termination connection can be easily assembled.

  In particular, the air termination connection portion 200 does not require the work of filling the insulating oil or the insulating gas in the field even when the air termination connection portion is assembled using a high-voltage (for example, 154 kV) power cable. The garment pipe unit for the aerial end connection part is easy to handle, and the work efficiency when assembling the aerial end connection part can be improved.

  In addition, since the garment tube unit 100 includes the gel-like gel-like solid insulator 140 formed of silicone gel as an internal insulator, the inclination when installing the garment tube unit is not restricted, and the direction is free. Can be installed at.

  Further, since the gel-like solid insulator 140 is gel-like unlike conventionally used oil or gas, the gel-like solid insulator 140 itself is not scattered as a scattered matter at the time of ground fault.

  In addition, unlike conventional air termination connections that use insulating oil or insulating gas filled in the insulation pipe as an insulating compound, it prevents leakage of the insulating compound to the outside due to external loads such as earthquakes and aging. Maintenance is not required.

  The garment pipe unit for an air termination connection part and the air termination connection part according to the present invention are not limited to the above-described embodiments, and can be implemented with various modifications. For example, in the embodiment of the present invention, at least one of the insulating jacket portion 114 and the insulator tube main body 112 of the insulator tube 110 made of hard plastic resin or polymer may be made of porcelain.

  The assembling method of the insulator pipe unit, the air terminal connection part and the gas pipe unit according to the present invention can be used for the air terminal connection part of the high-voltage power cable, and the air terminal connection part can be suitably assembled in the field. It has an effect that can be achieved, and is useful as an air termination connection portion.

Sectional drawing which shows the structure of the insulator pipe unit which concerns on one embodiment of this invention The fragmentary sectional view of the air termination connection part concerning the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Insulation pipe unit 110 Insulation pipe 110a Insulation pipe base end 112 Insulation pipe main body part 114a collar part 120 Cable 120a Power cable connection part 128 Conductor extraction rod 130 Stress cone 140 Gel-like solid insulator 200 In-air terminal connection part 300 Electric power Cable 310 cable end

Claims (5)

A cylindrical tube made of a porcelain or polymer having a cylindrical shape and a plurality of flanges formed on the outer peripheral surface and spaced apart in the longitudinal direction;
Arranged on the substantially axial center of the insulation pipe, one end portion is led out from the proximal end side of the insulation pipe, and the cable conductor, the cable insulator, and the external semiconductivity are provided from the other end side in the insulation pipe. A cable with exposed layers;
A cylindrical stress cone disposed in the insulator tube and externally fitted to a boundary portion between the cable insulator and the outer semiconductive layer in the cable;
A gel-like solid insulation is formed by filling a gel-like solid insulator between the insulator tube and the cable and the stress cone, and arranged in close contact with the inner wall surface of the insulator tube and the outer surface of the cable and the stress cone. Body,
Having a gauze tube unit.   In the cable, one end portion led out from the base end portion of the insulating tube exposes the cable conductor, the cable insulator, and the external semiconductive layer in order from the tip, and is connected to the power cable and the rubber block to be connected to the rubber block. 2. The insulating pipe unit according to claim 1, wherein the insulating pipe unit is an end.   The garment tube unit according to claim 1, wherein the gel-like solid insulator is made of silicone gel.   The end portion of the cable led out from the base end portion of the garment tube in the garment tube unit according to claim 1 and the power cable are abutted and connected by covering the abutting portion with a cylindrical insulating rubber block. Become an air termination connection. A method for assembling an insulator pipe unit according to claim 1,
In a cylinder tube made of porcelain or polymer having a cylindrical shape and a plurality of flanges spaced apart in the longitudinal direction on the outer peripheral surface, one end of the tube is substantially on the axis and the base end of the tube Placing the cable with the cable conductor, the cable insulator, and the external semiconductive layer exposed from the other end side in the garment tube, and leading to the outside from the part side;
Externally fitting a stress cone at the boundary between the cable insulator and the outer semiconductive layer in the cable;
A gel-like solid insulator is provided in which a gel-like solid insulator is filled between the insulator tube and the cable and the stress cone, and is arranged in close contact with the inner wall surface of the insulator tube and the outer periphery of the cable and the stress cone. And a step of assembling the insulating pipe unit.

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