JP2011120321A - Metal fixture integrated protective pipe, and connecting portion between insulating bushing and power cable using the metal fixture integrated protective pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact metal fixture integrated protective pipe which prevents water from permeating through between an insulating bushing and a pressing metal fixture, by directly transmitting a pressing force to an O-ring arranged on an insulating flange of the insulating bushing. <P>SOLUTION: The metal fixture integrated protective pipe 5 includes: a cylindrical portion 51 having opened both ends; and a circular pressing metal fixture 52 which is continuously provided to be concentric with the cylindrical portion on one end side of the cylindrical portion. A circular O-ring housing groove 52a is provided concentrically with the pressing metal fixture on the inner circumferential side of the opening end side of the pressing metal fixture, and a bolt insertion hole 52b is provided so as to penetrate in the axial direction on the outer peripheral side of the pressing metal fixture. The pressing metal fixture constituting the metal fixture integrated protective pipe is attached on the insulating flange constituting the insulating bushing through the O-ring, and a waterproof layer is provided over the outer circumference of a cable outside semiconductor layer constituting a cable terminal on the outer circumference of the opposite end of the cable terminal of the cylindrical portion constituting the metal fixture integrated protective pipe. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fitting-integrated protective tube and a connecting portion between an insulating bushing using the bracket-integrated protective tube and a power cable, and particularly when water is prevented from entering between the insulating bushing and the holding fitting. The present invention relates to a useful fitting-integrated protection tube and a connection portion between an insulating bushing and a power cable using the fitting-integrated protection tube.

  Conventionally, in an inter-panel bus for a solid insulation switchgear of 36 kV class, an internal conductor of an insulation bushing and a cable conductor of a cable end are connected via a connecting conductor (for example, Non-Patent Document 1). ).

  FIG. 3 shows a partial cross-sectional view of the connecting portion of the inter-board bus.

  In the figure, an insulating bushing 100 includes an epoxy insulator 200 having an insulating flange 210 at one end and an internal conductor 300 embedded in the center of the epoxy insulator 200. The end of the internal conductor 300 is epoxy-insulated. It projects from the other end of the body 200 outward in the axial direction.

  The end portion of the CV cable 400 is stepped to expose the cable outer semiconductive layer 410, the cable insulating layer 420, and the cable conductor 430, and a conductor connection terminal 440 is provided at the exposed end portion of the cable conductor 430. It is attached by compression.

  The conductor connection terminal 440 of the cable terminal 500 thus stripped and the internal conductor 300 of the insulating bushing 100 are electrically connected by a linking conductor 600 having a split structure, and is connected to the outer periphery of the linking conductor 600. The following insulation molded body 700 is mounted.

  The insulating molded body 700 is provided integrally with the insulating cylinder main body 710 on the inner periphery of the central portion of the insulating cylinder main body 710 and the cylindrical inner cylinder main body 710 made of insulating rubber, and the inner peripheral surface of itself is exposed. An internal semiconductive layer 720 made of semiconductive rubber, and a pair of stress cones 730, 740 made of semiconductive rubber and provided integrally with the insulating cylinder body 710 at both ends of the insulating cylinder body 710; And an external semiconductive layer 750 formed of a semiconductive paint (or semiconductive rubber) and formed on the outer periphery of the insulating cylinder main body 710.

  Reference numeral 800 denotes an annular pressing metal fitting, and a locking portion 810 that protrudes radially inward is provided on one end side of the pressing metal fitting 800. In addition, the presser fitting 800 is provided with a bolt insertion hole 820 that penetrates in the axial direction.

  The holding metal fitting 800 having such a configuration is brought into contact with the surface of the insulating flange 210 facing the cable terminal 500, and the tip of a bolt (not shown) inserted into the bolt insertion hole 820 is embedded in the insulating flange 210. The insulation molded body 700 is attached to the insulation flange 210 by being screwed to the metal fitting 220.

  Since the connection portion between the insulation bushing and the power cable having such a configuration is disposed in the device, the device is waterproof, and the connection portion between the insulation bushing and the power cable is not waterproof. It is structured.

  On the other hand, recently, attempts have been made to lay the connection between the insulation bushing and the power cable outdoors or in the pit. However, the connection between the insulation bushing and the power cable described above is left outside or in the pit. When installed, there was a risk of water intrusion from between the insulating bushing and the presser fitting.

  For this reason, as shown in FIG. 4, a waterproof structure has been devised in which a cylindrical protective tube 900 is disposed on the outer periphery of the insulating molded body 700 and waterproofing is performed on both ends of the protective tube 900. Specifically, the protective tube 900 has an inner flange 910 that protrudes radially inward at one end and an outer flange 920 that protrudes radially outward at the other end. The outer flange 920 provided with an O-ring (not shown) on the end face is brought into contact with the surface of the insulating flange 210 facing the cable terminal 500 (hereinafter referred to as “opposing surface”), and then the outer flange 920 A bolt (not shown) is inserted into the provided bolt insertion hole (not shown), and the tip portion is screwed to an embedded fitting (not shown) different from the embedded fitting 220. Further, an anticorrosion layer is provided on the rear end side (cable terminal side) of the protective metal fitting 900. Thereby, it becomes possible to prevent water from entering the connecting portion between the insulating bushing and the power cable.

  As another configuration, the protective tube 900 is disposed on the outer periphery of the insulating molded body 700 without the presser bracket 800 of FIG. 4 and insulated by an inner flange 910 provided on one end side of the protective tube 900. A structure has also been devised in which the molded body 700 is pressed in the axial direction toward the insulating flange 210 (for example, Patent Document 1). Specifically, the protective tube 900 has an inner flange 910 that protrudes radially inward at one end and an outer flange 920 that protrudes radially outward at the other end. The inner flange 910 is in contact with the end face on the rear end side of the insulating molded body 700, and the outer flange 920 provided with an O-ring (not shown) on the end face faces the cable end 500 of the insulating flange 210. (Hereinafter referred to as “opposing surface”), a bolt (not shown) is inserted into a bolt insertion hole (not shown) provided in the outer flange 920, and its tip is screwed to the embedded metal fitting 220. To do. Further, an anticorrosion layer is provided on the rear end side (cable terminal side) of the protective metal fitting 900. Thereby, the axial pressing force is transmitted to the insulating molded body 700, so that the insulating molded body 700 can be prevented from coming off, and water can be prevented from entering between the insulating bushing and the pressing metal fitting. Become.

However, in the waterproof structure configured as shown in FIG. 4, the protective tube 900 having a larger diameter than the outer diameter of the presser fitting 800 is disposed on the outer periphery of the presser fitting 800, so that the connection portion between the insulating bushing and the power cable is entirely disposed. However, there is a problem that the size and weight are increased, and the cost is also increased. Furthermore, in order to attach the outer flange 920 to the insulating flange 210, the outer diameter of the insulating flange 210 designed to be compact is increased, and further, an embedded bracket (not shown) separate from the existing embedded bracket 220 is provided. There is a difficulty that it is necessary to bury newly.
Further, in the waterproof structure configured by the protective tube 900 that presses from the rear end face side of the insulating molded body 700 without the presser fitting 800 of FIG. 4, the protective tube 900 is disposed in place of the presser fitting 800, and therefore, more than FIG. Although a simple connection portion can be formed, since the pressing force is transmitted through the insulating molded body 700 made of an elastic material, the pressing force against the opposing surface of the insulating flange 210 becomes insufficient, and as a result, the insulating bushing and the pressing metal fitting There is a risk of water intrusion from between.

2006 IEEJ National Convention 7-122

JP 2005-6424

  The present invention has been made to solve the above-mentioned problems, and is compact and transmits a pressing force directly to an O-ring disposed on the insulating flange side of the insulating bushing, so that the insulating bushing and the holding metal fitting can be used. It is an object of the present invention to provide a fitting-integrated protective tube that can prevent water from entering, and a connecting portion between an insulating bushing and a power cable using the same.

  A protective tube according to a first aspect of the present invention includes a cylindrical portion whose both end portions are open, and an annular pressing metal fitting concentrically connected to the cylindrical portion on one end side of the cylindrical portion. An annular O-ring storage groove is provided concentrically with the presser fitting on the inner peripheral side of the open end surface side, and a bolt insertion hole is provided on the outer peripheral side of the presser fitting so as to penetrate in the axial direction. On the rear end side, a flange for abutting the front end surface to the insulating molded body flange is provided concentrically and integrally.

  According to a second aspect of the present invention, in the bracket integrated protection tube according to the first aspect, an embedded bracket is embedded along the axial direction on the outer peripheral edge side of the insulating flange provided at one end of the insulating bushing. The bolt insertion hole of the presser fitting is provided at a position corresponding to the embedded fitting.

  According to a third aspect of the present invention, in the bracket-integrated protective tube according to the first aspect or the second aspect, the cylindrical portion has a large shape corresponding to the outer surface shape of the large-diameter portion of the insulating molded body surrounding itself. A tapered cylinder corresponding to the outer surface shape of the tapered portion of the insulating molded body by connecting the diameter cylindrical portion, the small diameter cylindrical portion corresponding to the outer surface shape of the small diameter portion of the insulating molded body, and the large diameter cylindrical portion and the small diameter cylindrical portion. Part.

  The connecting portion between the insulating bushing and the power cable according to the fourth aspect of the present invention includes a conductor connecting portion formed by connecting the inner conductor of the insulating bushing and the cable conductor of the cable end, and a cable end on the outer periphery of the conductor connecting portion. An insulation molded body that is mounted across the outer periphery of the outer semiconductive layer of the cable constituting the cable and the outer periphery of the bushing insulator constituting the insulation bushing and has an insulating molded body collar at the end of the insulation bushing, and the outer periphery of the insulation molded body The metal fitting-integrated protection tube of any one of the first to third aspects is included, and the holding metal fitting constituting the metal fitting-integrated protection tube has an O-ring on the insulating flange constituting the insulating bushing. Attached so that the front end surface of the collar provided on the rear end side of the presser fitting is in contact with the insulation molded body collar, and faces the cable end of the cylindrical part that constitutes the bracket-integrated protective tube That on the outer periphery of the end portion in which a waterproof layer over the outer periphery of the cable outer semiconductive layer is provided.

  According to the first embodiment to the fourth embodiment of the present invention, the fitting-integrated protection tube and the connecting portion between the insulating bushing and the power cable using the fitting-integrated protection tube have the following effects.

  First, since the presser fitting of the bracket-integrated protection tube can be attached to the opposing surface of the insulating flange and the O-ring accommodated in the O-ring storage groove of the presser fitting can be pressed directly, the pressing force against the opposing surface of the insulating flange As a result, water can be prevented from entering between the insulating bushing and the pressing metal.

  Second, since the bracket-integrated protective tube is constructed by integrating one end of the cylindrical portion with both ends opened to an annular pressing bracket by welding or silver brazing, By using the same holding metal fittings as before, it is possible to use the same insulation bushings as before, and as a result, the connection portion between the insulation bushings and the power cable can be made compact and cost effective. It is also cheaper.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of a bracket-integrated protective tube according to the present invention, in which FIG. (A) is a front view of the bracket-integrated protective tube, and (b) is a longitudinal sectional view of the bracket-integrated protective tube. The partial cross section figure which shows an example of the connection part of the insulation bushing and electric power cable of this invention. The partial cross section figure which shows an example of the connection part of the conventional insulation bushing and a power cable. The partial cross section figure which shows an example of the connection part of the conventional insulation bushing and a power cable.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a fitting integrated protective tube according to the present invention and a connecting portion between an insulating bushing and a power cable using the same are described below with reference to the drawings.

  FIG. 1 is an explanatory view of a metal fitting integrated protection tube according to the present invention. FIG. 1 (a) is a front view of the metal fitting integrated protective tube, and FIG. 1 (b) is a longitudinal sectional view of the metal fitting integrated protective tube. Yes.

  1 (a) and 1 (b), a bracket-integrated protective tube 5 according to the present invention includes a cylindrical portion 51 whose both ends are open, and a cylindrical portion 51 and one end of the cylindrical portion 51 that are welded or silver brazed. And an annular presser fitting 52 concentrically provided by the like.

  The cylindrical portion 51 includes a large-diameter cylindrical portion 51a corresponding to an outer surface shape of a large-diameter portion 6a of an insulating molded body 6 described later, a small-diameter cylindrical portion 51b corresponding to an outer surface shape of a small-diameter portion 6b of the insulating molded body 6, A diameter cylindrical portion 51 a and a small diameter cylindrical portion 51 b are connected to each other, and a tapered cylindrical portion 51 c corresponding to the outer shape of the tapered portion 6 c of the insulating molded body 6 is provided.

  The presser fitting 52 has a substantially rectangular shape when viewed from the front, and an annular O-ring storage groove 52a is concentric with the presser fitting 52 on the inner peripheral side of the open end face side (left side of FIG. 1B). On the rear end side (cylindrical part 51 side) of the presser fitting 52, a flange 52 c is provided concentrically and integrally with the presser fitting 52, and 4 on the outer peripheral side of the presser fitting 52. Each corner is provided with one bolt insertion hole 52b. As will be described later, the bolt insertion hole 52b is preferably provided at a position corresponding to the embedded metal fitting 220 (see FIG. 3) embedded in the conventional insulating flange 210 (see FIG. 3) designed to be compact. .

  FIG. 2 shows a partial cross-sectional view of the connecting portion between the insulating bushing and the power cable according to the present invention in which the bracket-integrated protective tube according to the present invention is applied to the connecting portion of the 36 kV class solid insulated switchgear panel bus. Yes. In the figure, parts common to those in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted.

  In FIG. 2, the connecting portion between the insulating bushing and the power cable according to the present invention includes a conductor connecting portion 4 formed by connecting an inner conductor 11 of the insulating bushing 1 described later and a conductor connecting terminal 24 of the cable terminal 2 described later. An insulating molded body 6 attached to the outer periphery of the conductor connecting portion 4 and the above-described metal fitting integrated protective tube 5 surrounding the outer periphery of the insulating molded body 6 are provided.

  The insulating bushing 1 includes an inner conductor 11 made of a rod body such as copper or copper alloy disposed in the center, and a hard and insulating bushing insulator 12 provided on the outer periphery of the inner conductor 11. The bushing insulator 12 is provided with a taper portion 12a that is gradually reduced in diameter toward the cable terminal 2 on the outer surface of the bushing insulator 12, and the outer diameter of the bushing insulator 12 is larger on the larger diameter portion side. An insulating flange 13 having a larger diameter than the bushing insulator 12 is connected to the bushing insulator 12 in a concentric manner. In addition, a plurality of embedded metal fittings 14 are embedded in the outer peripheral edge portion of the insulating flange 13 along the axial direction. In this embodiment, four embedded metal fittings 14 are provided so as to be equally distributed along the circumferential direction. The bushing insulator 12 and the insulating flange 13 are made of epoxy insulating resin or the like, and are integrally formed with the internal conductor 11 by molding.

  The insulating bushing 1 having such a configuration is disposed horizontally, and an end portion of the internal conductor 11 is projected from an end portion on the small diameter side of the bushing insulator 12 outward in the axial direction.

  On the other hand, the end portion of the cable terminal 2 is stepped to expose the cable outer semiconductive layer 21, the cable insulating layer 22, and the cable conductor 23, and the conductor connecting terminal 24 is exposed to the exposed end portion of the cable conductor 23. Is attached by compression. Here, the outer diameter of the conductor connection terminal 24 is substantially the same as the outer diameter of the inner conductor 11.

  Reference numeral 3 denotes a connecting conductor that connects the end of the inner conductor 11 and the conductor connection terminal 24 attached to the cable conductor 23, and the connecting conductor 3 is a pair of semi-cylindrical parts combined in a cylindrical shape. And a bolt (not shown) composed of a hexagon socket head cap screw or the like for fastening the pair of semi-cylindrical portions together.

  The connection conductor 3 (a pair of semi-cylindrical portions) having such a configuration is combined in a cylindrical shape on the outer periphery of the conductor connector 24 and the inner conductor 11 arranged so as to face horizontally, and is fastened with a bolt. It is fixed with a predetermined surface pressure.

  The insulation molded body 6 shown below is mounted on the outer periphery of the conductor connection portion 4 formed in this way.

  The insulating molded body 6 is provided with a cylindrical insulating cylinder main body 61 made of insulating rubber, and is provided integrally with the insulating cylinder main body 61 on the inner periphery of the central portion of the insulating cylinder main body 61, and the inner peripheral surface of itself is exposed. An internal semiconductive layer 62 made of semiconductive rubber, and a pair of stress cones 63, 64 made of semiconductive rubber and provided integrally with the insulating cylinder body 61 at both ends of the insulating cylinder body 61; An external semiconductive layer 65 made of a semiconductive paint (or semiconductive rubber) and formed on the outer periphery of the insulating cylinder main body 61 is provided. Further, the insulating molded body 6 is provided with an insulating molded body flange portion 6d having a diameter larger than that of the large diameter portion 6a of the insulating molded body, which will be described later, on the distal end side (insulating bushing side). In the embodiment of FIG. 2, it is constituted by a part of the insulating cylinder main body 61 and a part of the stress cone 64. The insulating molded body ridge portion 6d may be formed of only a part of the stress cone, or may be formed of only a part of the insulating cylinder body 61 (insulating rubber only) if there is a separate shielding means other than the stress cone 64. good.

  The insulation molded body 6 having such a configuration is inserted into the cable 20 in advance, and after the internal conductor 11 of the insulation bushing 1 and the conductor connection terminal 24 of the cable terminal 2 are connected, the insulation molded body 6 is insulated. By sliding back to the bushing 1 side and pulling back, the insulating molded body 6 is placed on the outer periphery of the conductor connecting portion 4 between the cable outer semiconductive layer 21 (outer conductive mold portion) of the cable 20 and the tapered portion 12a of the bushing insulator 12. It is mounted across a predetermined surface pressure.

  Next, the attachment method of the metal fitting integrated protection tube 5 in this invention is demonstrated.

  First, similarly to the insulating molded body 6, the bracket-integrated protective tube 5 is inserted into the cable 20 in advance, and the insulating molded body 6 is connected to the outer periphery of the conductor connecting portion 4 with the tapered portion 12 a of the bushing insulator 12 and the cable 20. After the cable outer semiconductive layer 21 (externally conductive mold part) is mounted across the cable, the fitting-integrated protective tube 5 is pulled back to the outer periphery of the insulating molded body 6 so that the large diameter of the fitting-integrated protective tube 5 is increased. The cylindrical portion 51 a is on the outer periphery of the large diameter portion 6 a of the insulating molded body 6, the tapered cylindrical portion 51 c is on the outer periphery of the tapered portion 6 c and the small diameter portion 6 b of the insulating molded body 6, and the small diameter cylindrical portion 51 b is on the outer periphery of the stress cone 63. The insulating flange 13 side end surface of the flange portion 52c of the presser fitting 52 is disposed so as to contact the rear end surface (cable side end surface) of the insulating molded body flange portion 6d. The holding metal fitting 52 of the metal fitting integrated protection tube 5 arranged on the outer periphery of the insulating molded body 6 is brought into contact with the side of the insulating flange 13 facing the cable 20 via an O-ring and is inserted into the bolt insertion hole 52b. The front end of the bolt (not shown) is screwed into the embedded metal fitting 14 of the insulating flange 13, so that the metal fitting is placed on the opposite side of the cable end 2 of the insulating flange 13 (hereinafter referred to as “counterface”). The holding metal fitting 52 of the body-shaped protective tube 5 is fixed in a watertight manner via an O-ring. In addition, a cable sheath (non-conductive) on the rear end side of the cable outer semiconductive layer 21 (outer conductive mold portion) of the cable 20 is provided on the rear end side of the bracket-integrated protective tube 5, that is, on the outer periphery of the end of the small diameter cylindrical portion 51b. A waterproofing layer 7 made of a shrinkable tube or the like is provided across the gap. Thereby, the waterproofing process between the small diameter cylindrical part 51b of the bracket integrated protection tube 5 and the cable terminal 2 is completed.

  As described above, according to the connection portion between the insulating bushing and the power cable using the metal fitting-integrated protective tube 5 of the present invention, the following effects can be obtained.

  First, the front end surface of the flange portion 52c provided on the rear end portion side of the presser fitting 52 contacts the insulating molded body flange portion 6d provided on the front end side (insulating flange 13 side) of the insulating molded body 6. In this way, since the bracket-integrated protective tube 5 is attached to the opposing surface of the insulating flange 13 and the O-ring accommodated in the O-ring housing groove 52a of the pressing bracket 52 can be directly pressed, Compared with a structure in which the end face is pressed by a protective tube (Patent Document 1 or the like), the pressing force against the facing surface of the insulating flange 13 can be directly transmitted, so that water does not enter between the insulating bushing and the holding metal fitting. can do.

  Secondly, since the bracket-integrated protective tube 5 is configured by integrating one end side of the cylindrical portion 51 with both ends open to the annular pressing bracket 52 by welding or silver brazing, By using the same pressing metal 52 as the conventional pressing metal 52, it is possible to use the same insulating bushing 1 as the conventional one, and thus forming the connecting part between the insulating bushing and the power cable in a compact manner. In addition, it is cheaper in terms of cost.

  In the above-described embodiments, the present invention is described with specific embodiments shown in the drawings. However, the present invention is not limited to these embodiments, and as long as the effects of the present invention are exhibited, You may comprise as follows.

  1stly, in the above-mentioned Example, although the connection between the insulation bushing 1 arrange | positioned horizontally and the cable terminal 2 arrange | positioned horizontally is described, the insulation bushing 1 and the cable terminal 2 are cable end connection parts. In this case, the direction of the insulating bushing is not particularly limited.

  Secondly, in the above-described embodiment, the case where four holding holes 52b are provided in the presser fitting 52 and four embedded fittings 14 are embedded in the insulating flange 13 is described. And the number of embedded metal fittings 14 is not limited to these numbers.

  Thirdly, the connection part between the insulation bushing and the power cable of the present invention includes an air end connection part, a gas end connection part, an oil end connection part, an intermediate connection part, an inter-board bus bar, etc. In the embodiment, any insulation type (so-called outer cone type cable connection portion) may be applied as long as it is an insulation molding.

  Fourth, the inner conductor is not limited to one formed of copper or a copper alloy, and may be formed of aluminum or an aluminum alloy.

  Fifth, in the above-described embodiment, the rated voltage is 36 kV class, but the rated voltage may be lower or higher.

  Sixth, the rear end portion side of the metal-incorporated protection tube 5 of the present invention forms the waterproof layer 7 with a shrinkable tube in the above-described embodiment, but the anticorrosion with a waterproof tape or the like according to the embodiment. What is necessary is just to form a required waterproof layer, such as providing a layer.

  Seventh, the insulating molded body 6 may be provided with an edge cut portion as necessary.

  Eighth, if the insulating molded body 6 has an insulating molded body flange 6d on the tip side in order to contact the flange 52c of the holding metal fitting 52 on the bracket-integrated protective tube 5 side, Even if the tapered portion and the small diameter portion are not provided, a structure having a constant outer diameter excluding the flange portion 6d may be used.

  Ninth, the contact surface between the insulating molded body flange 6d and the flange 52c of the bracket-integrated protective tube 5 may be tapered.

DESCRIPTION OF SYMBOLS 1 ... Insulating bushing 13 ... Insulating flange 14 ... Embedded metal fitting 2 ... Cable end 21 ... Cable outer semiconductive layer 23 ... Cable conductor 4 ... Conductor connection part 5 ...・ Metal fitting integrated protection tube 51... Cylindrical part 51 b... Small diameter cylindrical part 51 c... Tapered cylindrical part 52... Holding metal part 52 a... O-ring storage groove 52 c. Insulation molded body 6a ... large diameter part 6b ... small diameter part 6c ... tapered part 6d ... insulation molded body collar part 7 ... waterproof layer

Claims (4)

A cylindrical portion having both ends opened, and an annular pressing metal fitting concentrically connected to the cylindrical portion on one end side of the cylindrical portion;
An annular O-ring housing groove is provided concentrically with the presser fitting on the inner peripheral side on the open end surface side of the presser fixture,
A bolt insertion hole is provided on the outer peripheral side of the pressing metal so as to penetrate in the axial direction, and a flange for abutting the front end surface of the pressing metal with the insulating molded body collar is provided on the rear end of the pressing metal. A bracket-integrated protective tube characterized by being provided concentrically and integrally. Embedded metal fittings are embedded along the axial direction on the outer peripheral edge side of the insulating flange provided at one end of the insulating bushing,
2. The bracket-integrated protection tube according to claim 1, wherein the bolt insertion hole of the pressing bracket is provided at a position corresponding to the embedded bracket.   The cylindrical portion includes a large-diameter cylindrical portion corresponding to an outer surface shape of a large-diameter portion of an insulating molded body surrounding itself, a small-diameter cylindrical portion corresponding to an outer surface shape of a small-diameter portion of the insulating molded body, and the large-diameter 3. A bracket-integrated protection according to claim 1, further comprising: a cylindrical portion having a taper corresponding to an outer surface shape of the tapered portion of the insulating molded body, wherein the cylindrical portion and the small-diameter cylindrical portion are connected to each other. tube. A conductor connecting portion formed by connecting the inner conductor of the insulating bushing and the cable conductor of the cable end, and the outer periphery of the cable outer semiconductive layer constituting the cable end on the outer periphery of the conductor connecting portion and the bushing insulator constituting the insulating bushing The metal fitting integrated type according to any one of claims 1 to 3, wherein the metal mold is mounted across an outer periphery and has an insulating molded body flange at an insulating bushing side end, and surrounds the outer periphery of the insulating molded body. With a protective tube,
The presser fitting constituting the bracket-integrated protective tube has a front end surface of a flange portion provided on the rear end side of the presser fitting via an O-ring on an insulating flange constituting the insulating bushing. A waterproof layer is provided over the outer periphery of the cable external semiconductive layer on the outer periphery of the end of the cylindrical portion that constitutes the bracket-integrated protective tube that faces the cable terminal. A connecting portion between an insulating bushing and a power cable.

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