Power cable connection device and method for manufacturing power cable connection device

Abstract

To provide a power cable connection device that can prevent stress generated on a porcelain tube, and a method for manufacturing a power cable connection device.SOLUTION: A power cable connection device 1 comprises: a porcelain tube 21 into which a power cable 10 is inserted; a pipe member 22 that is inserted and arranged inside the porcelain tube 21, and surrounds the power cable 10; and an attachment member 23 that is arranged on an outer peripheral side of the pipe member 22, and is partially embedded in the porcelain tube 21 so that an attachment surface 233 to be attached to another member is exposed from the porcelain tube 21.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power cable connection device and a method for manufacturing the power cable connection device. [Background technology]

[0002] Patent Document 1 discloses a power cable connection device for connecting a power cable to other electric wires, etc. The power cable connection device described in Patent Document 1 includes a porcelain bushing made of a polymer-based material, a pipe member arranged inside the porcelain bushing, and an attachment member that surrounds the pipe member from the outer periphery and is partially embedded in the porcelain bushing. The porcelain bushing has an insulator, a first semiconductive portion formed between the insulator and the pipe member, and a second semiconductive portion formed between the insulator and the attachment member.

[0003] Here, since the insulator, first semiconductive part, second semiconductive part, pipe member, mounting member, etc. are integrated by molding, the first semiconductive part is fixed to both the insulator and the pipe member, and the second semiconductive part is fixed to both the insulator and the mounting member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-116279 Summary of the Invention [Problem to be solved by the invention]

[0005] In the power cable connection device described in Patent Document 1, stress may occur in the portion of the porcelain bushing between the pipe member and the mounting member due to differences in thermal expansion coefficients among the pipe member, the porcelain bushing, and the pipe member.

[0006] The present invention has been made in view of the above circumstances, and has an object to provide a power cable connection device and a method for manufacturing the power cable connection device that can suppress stress generated in a porcelain bushing. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the present invention provides a power cable connection device comprising: a porcelain tube into which a power cable is inserted; a pipe member inserted and disposed inside the porcelain tube and surrounding the power cable; and an attachment member disposed on the outer periphery of the pipe member and partially embedded in the porcelain tube so that an attachment surface to be attached to another member is exposed from the porcelain tube.

[0008] In order to achieve the above-mentioned object, the present invention also provides a method for manufacturing a power cable connection device comprising: a porcelain tube into which a power cable is inserted; a pipe member arranged inside the porcelain tube and surrounding the power cable; and an attachment member arranged outer than the pipe member and partially embedded in the porcelain tube so that an attachment surface to be attached to another member is exposed from the porcelain tube, the method comprising the steps of: forming the porcelain tube; and, after the porcelain tube is formed, inserting the pipe member into the inside of the porcelain tube. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a power cable connection device and a method for manufacturing a power cable connection device that can suppress stress generated in a porcelain bushing. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view of a power cable connection device according to a first embodiment. [Figure 2] FIG. 2 is an enlarged view of a part of FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] 3 is a cross-sectional view of the porcelain tube, the mounting member, and the pipe member before assembly in the first embodiment. FIG. [Figure 6]3 is a cross-sectional view of the porcelain tube, the mounting member, and the pipe member after assembly in the first embodiment. FIG. [Figure 7] FIG. 10 is an enlarged cross-sectional view of a portion of the power cable connection device according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] [First embodiment] A first embodiment of the present invention will be described with reference to Figures 1 to 6. The embodiment described below is shown as a preferred specific example for carrying out the present invention, and although various technically preferable technical matters are specifically exemplified, the technical scope of the present invention is not limited to this specific embodiment.

[0012] (Power cable connection device 1) FIG. 1 is a cross-sectional view of a power cable connection device 1 according to this embodiment. As shown in FIG. 1, the power cable connection device 1 includes a main body 2, a cover 3, and a connection portion 4. The main body 2 ensures electrical insulation between the stepped stripped power cable 10 and components disposed around the power cable 10. The cover 3 covers a portion of the main body 2. The connection portion 4 is a component for connecting the power cable 10 to the outside of the power cable connection device 1. Hereinafter, the direction in which the central axis of the power cable 10 (i.e., the dashed-dotted line in FIG. 1 ) extends will be referred to as the axial direction X. The side of the power cable 10 in the axial direction X that is inserted into the power cable connection device 1 will be referred to as the tip side X1, and the opposite side will be referred to as the base side X2. The term "radial direction" simply refers to the radial direction centered on the central axis of the power cable 10. One side in the radial direction, that is the direction toward the central axis of the power cable 10, will be referred to as the inner circumferential side, and the opposite side will be referred to as the outer circumferential side.

[0013] (Main body 2) The main body 2 includes a porcelain tube 21, a pipe member 22, a mounting member 23, and a flange member 24.

[0014] The porcelain bushing 21 includes an insulator 210 and semiconductive portions provided on the surface of the insulator 210 (in this embodiment, a first semiconductive portion 211, a second semiconductive portion 212, and a third semiconductive portion 213).

[0015] The insulator 210 is made of, for example, a polymer material formed into a tubular shape and has flexibility. Examples of polymer materials that can be used for the insulator 210 include silicone rubber, ethylene propylene rubber (EPM), and ethylene propylene diene rubber (EPDM). In particular, using a material with relatively high tear strength for the insulator 210 makes it easier to prevent cracks from occurring in the insulator 210. Furthermore, using a material with a relatively low elastic modulus for the insulator 210 makes it easier to insert the power cable 10 into the insulator 210. In a free state before the cable is inserted into the insulator tube 21, a portion of the inner circumferential surface of the insulator tube 21 closer to the base end X2 than the pipe member 22 is smaller than the outer diameter of the power cable 10 to be inserted therein. The power cable 10 is inserted into the insulator tube 21 while expanding the portion of the inner circumferential surface of the insulator tube 21 closer to the base end X2 than the pipe member 22.

[0016] On the outer periphery of the insulator 210, annular umbrella portions 210a protruding outward are provided at a predetermined interval in a plurality of positions in the axial direction X. By forming a plurality of umbrella portions 210a on the insulator 210, it is possible to ensure a creeping distance on the outer periphery of the insulator 210, and it is possible to suppress the occurrence of creeping discharge along the surface of the insulator 210.

[0017] The insulator 210 is formed by insert molding in which the mounting member 23, on the surface of which the first semiconductive portion 211 and the second semiconductive portion 212 are formed, and the third semiconductive portion 213 are placed in a mold. In this way, the insulator 210 is formed so as to be fixed to each of the first semiconductive portion 211, the second semiconductive portion 212, and the third semiconductive portion 213.

[0018] The first semiconductive portion 211, the second semiconductive portion 212, and the third semiconductive portion 213 are made of an elastic semiconductive material that is made conductive by dispersing conductive powder such as carbon in, for example, silicone rubber, EPM, EPDM, etc. The first semiconductive portion 211, the second semiconductive portion 212, and the third semiconductive portion 213 suppress electric field concentration in the surroundings.

[0019] The first semiconductive portion 211 is provided in the form of a film on the inner circumferential surface of the insulator 210 and is interposed between the insulator 210 and the pipe member 22. The first semiconductive portion 211 has a surrounding portion 211a formed in a cylindrical shape so as to surround the outer circumferential surface of the pipe member 22, and an extending portion 211b extending from the surrounding portion 211a to the base end side X2. The surrounding portion 211a surrounds the pipe member 22 from the outer circumferential side, excluding the tip end portion. The extending portion 211b is formed to extend further inward than the pipe member 22 and has a thickness greater than that of the surrounding portion 211a. The extending portion 211b is interposed between the insulator 210 and the power cable 10 inserted inside the pipe member 22.

[0020] Fig. 2 is an enlarged view of a portion of Fig. 1. As shown in Fig. 2, the surface of the extension portion 211b on the tip side X1 forms a restricting surface 211c that abuts against the end surface of the base side X2 of the pipe member 22. As will be described later, when the pipe member 22 is inserted into the porcelain tube 21, the restricting surface 211c abuts against the end surface of the base side X2 of the pipe member 22, thereby restricting further insertion of the pipe member 22 into the porcelain tube 21. The first semiconducting portion 211 is formed, for example, by molding or the like.

[0021] 1 and 2, the second semiconductive portion 212 is provided in the form of a film so as to be interposed between the insulator 210 and the mounting member 23. The second semiconductive portion 212 is formed, for example, by insert molding in which the mounting member 23 is placed in a mold. In this way, the second semiconductive portion 212 is fixed to the mounting member 23.

[0022] 1, the third semiconductive portion 213 is formed inside the end portion on the base end side X2 of the insulator 210 and has an annular shape. The third semiconductive portion 213 is brought into contact with the exposed outer peripheral surface of the power cable 10 inserted into the porcelain bushing 21. The third semiconductive portion 213 is formed by molding or the like.

[0023] The pipe member 22 is made of a metal such as brass or an aluminum alloy and formed into a long tubular shape (specifically, a cylindrical shape) in the axial direction X. The pipe member 22 is made of a material that is more rigid than the porcelain tube 21. The pipe member 22 is disposed on the inner periphery side of the porcelain tube 21 and reinforces the porcelain tube 21, which has flexibility.

[0024] The pipe member 22 is inserted into an insertion hole 21a that is configured from the restricting surface 211c to the tip side X1 on the inner circumferential surface of the porcelain tube 21. The insertion hole 21a is a cylindrical hole, and is configured by the inner circumferential surface of the surrounding portion 211a of the first semiconductive portion 211 and the inner circumferential surface of the insulator 210 that is located on the tip side X1 thereof.

[0025] In this embodiment, the pipe member 22 is press-fitted into the insertion hole portion 21a of the porcelain tube 21. That is, in a state where the pipe member 22 is not inserted into the insertion hole portion 21a (i.e., in a free state), the inner diameter of the insertion hole portion 21a is smaller than the outer diameter of the pipe member 22, and the pipe member 22 is inserted into the insertion hole portion 21a while pushing and widening the insertion hole portion 21a.

[0026] In this way, by assembling the pipe member 22 into the porcelain tube 21 by insertion, the pipe member 22 comes into contact with the inner surface of the insertion hole 21a but is not fixed to the inner surface of the insertion hole 21a. Unlike the present embodiment, if the pipe member 22 were fixed to the inner surface of the insertion hole 21a, the portion of the porcelain tube 21 interposed between the pipe member 22 and the mounting member 23 would be fixed to the pipe member 22 on the inner circumferential side and to the mounting member 23 on the outer circumferential side, and expansion and contraction to both the inner circumferential side and the outer circumferential side would be hindered, and stress would be likely to increase. On the other hand, if the pipe member 22 and the porcelain tube 21 are not fixed to each other as in the present embodiment, the portion of the porcelain tube 21 interposed between the pipe member 22 and the mounting member 23 would be prevented from being pulled by the pipe member 22, and stress would be reduced.

[0027] An end portion on the tip side X1 of the pipe member 22 protrudes from the porcelain tube 21 and is electrically connected to the power cable 10 via a connection portion 4 described below. An end portion on the base side X2 of the pipe member 22 faces the mounting member 23 in the radial direction via the porcelain tube 21. The pipe member 22 is formed so that the inner diameter is larger than the outer diameter of the portion of the power cable 10 that is disposed inside the pipe member 22. This makes it easier to insert the power cable 10 inside the pipe member 22.

[0028] Fig. 3 is a cross-sectional view taken along the line III-III in Fig. 2. As shown in Figs. 2 and 3, the mounting member 23 is disposed on the outer periphery side of the pipe member 22. The mounting member 23 is formed in a tubular shape so as to surround the base end side X2 of the pipe member 22 from the outer periphery side. As shown in Fig. 2, the mounting member 23 includes a cylindrical tubular portion 231 and an annular protruding portion 232 formed so as to protrude outer periphery from the end of the base end side X2 of the tubular portion 231.

[0029] The mounting member 23 is made of a material having higher rigidity than the porcelain tube 21, such as a metal such as brass or an aluminum alloy, and is connected to a ground potential when the power cable connection device 1 is in use. The thermal expansion coefficients of the pipe member 22 and the mounting member 23 are each smaller than the thermal expansion coefficient of the insulator 210.

[0030] The mounting member 23 is partially embedded in the porcelain tube 21 so that a mounting surface 233, which is the surface to which the flange member 24 is attached, is exposed from the porcelain tube 21. The mounting member 23 is formed with a female threaded hole 234 that opens onto the mounting surface 233. A bolt B1 for fixing the flange member 24 to the mounting member 23 is screwed into the female threaded hole 234.

[0031] The flange member 24 is formed in an annular shape. The flange member 24 is secured to the mounting member 23 by bolts B1 while overlapping the mounting surface 233. The flange member 24 is formed with bolt insertion holes 241 through which bolts (not shown) are inserted for mounting the flange member 24 to the mounting object 100. The flange member 24 also has female threaded holes 242 that open to the surface on the base end side X2. A bolt B2 for securing the cover 3 to the flange member 24 is threaded into the female threaded hole 242. Sealing portions 11 for ensuring watertightness are arranged between the flange member 24 and the mounting member 23 and between the flange member 24 and the cover 3.

[0032] (Cover 3) 1, the cover 3 is made of brass, aluminum alloy, or the like and formed into a cylindrical shape, and covers the outer periphery of the main body 2 that protrudes from the flange member 24 to the base end side X2. A cover flange 31 that protrudes to the outer periphery is formed at the end of the tip end side X1 of the cover 3. The cover flange 31 is fixed to the flange member 24 using bolts B2.

[0033] The gap between the end of the base end side X2 of the cover 3 and the power cable 10 is sealed by a sealing portion 12. The sealing portion 12 is formed by wrapping an adhesive-provided polyethylene tape, epoxy tape, or the like around the outer periphery of the power cable 10, and provides a watertight seal between the cover 3 and the power cable 10.

[0034] (Connection 4) The connection part 4 includes a conductor connecting rod 41, a high-voltage shield 42, a fixed terminal 43, and a co-fastening nut 44. The conductor connecting rod 41 has a crimping hole 411 that is open on the base end side X2. The cable conductor 101 exposed from the power cable 10 is inserted into the crimping hole 411, and the end of the conductor connecting rod 41 on the base end side X2 is crimped toward the cable conductor 101. This connects the conductor connecting rod 41 and the power cable 10. The conductor connecting rod 41 also has a male thread portion 412 that protrudes on the tip end side X1. The male thread portion 412 passes through both the high-voltage shield 42 and the fixed terminal 43.

[0035] The high-voltage shield 42 is made of a conductor and has a cylindrical shape with a bottom that is open on the base end side X2. The high-voltage shield 42 is fitted onto the tip end portion of the pipe member 22 that protrudes from the porcelain tube 21 on the tip end side X1.

[0036] The fixed terminal 43 is plate-shaped and overlaps the high-voltage shield 42 from the tip side X1. A connection hole 431 is formed in the fixed terminal 43 for connection to an external electric wire or the like. The fixed terminal 43 and the high-voltage shield 42 are fastened together between the conductor connecting rod 41 and a fastening nut 44, whereby the fixed terminal 43, the high-voltage shield 42, and the conductor connecting rod 41 are electrically connected to one another.

[0037] (Power Cable 10) Fig. 4 is a cross-sectional view taken along line VI-VI in Fig. 1. As shown in Fig. 4, the power cable 10 includes, in order from the center, a cable conductor 101, a cable inner semiconductive layer 102, a cable insulator 103, a cable outer semiconductive layer 104, a cable shield layer 105, and a cable sheath 106. The power cable 10 is stripped in stages from a tip side X1 in the axial direction X so that the cable conductor 101, the cable insulator 103, the cable outer semiconductive layer 104, and the cable shield layer 105 are exposed in this order.

[0038] The cable conductor 101 is formed, for example, by twisting together multiple wires. The cable inner semiconductive layer 102 and the cable outer semiconductive layer 104 are provided to reduce electric field concentration and are formed, for example, by extruding a polymer-based material that is made conductive by dispersing conductive powder such as carbon. The cable outer semiconductive layer 104 is electrically connected to the cable shield layer 105 and is in contact with the third semiconductive portion 213 as shown in FIG. 1. This allows the third semiconductive portion 213 to be grounded via the cable outer semiconductive layer 104 and the cable shield layer 105. The cable insulator 103 and the cable sheath 106 are formed, for example, by extruding an insulating material. The cable shield layer 105 is formed, for example, by a wire wound transversely around the cable outer semiconductive layer 104 and is grounded during use.

[0039] (Example of using the power cable connection device 1) Next, an example of how the power cable connection device 1 of this embodiment can be used will be described. The power cable connection device 1 is attached to, for example, the roof of a railway vehicle. In this case, a wall constituting the roof of the railway vehicle, a case provided on the roof of the railway vehicle for accommodating the power cable connection device 1, or the like, becomes the attachment target 100. The power cable connection device 1 can be used for, for example, electrical connection between adjacent railway vehicles, electrical connection with a pantograph, etc.

[0040] (Manufacturing method of the power cable connection device 1) Next, one example of a method for manufacturing the power cable connection device 1, particularly a method for attaching the pipe member 22 to the porcelain tube 21, will be described with reference to FIGS.

[0041] Fig. 5 is a cross-sectional view of the porcelain tube 21, the mounting member 23, and the pipe member 22 before they are assembled. Fig. 6 is a cross-sectional view of the porcelain tube 21, the mounting member 23, and the pipe member 22 after they have been assembled. When assembling the pipe member 22 to the porcelain tube 21, first, the porcelain tube unit 5, in which the mounting member 23 and the porcelain tube 21 are integrated, and the pipe member 22 are separately prepared. The porcelain tube unit 5 is integrally formed by molding the insulator 210 by insert molding in which the first semiconductive portion 211, the second semiconductive portion 212, and the third semiconductive portion 213 formed by molding the mounting member 23 are placed in a mold.

[0042] Next, the pipe member 22 is inserted into the insertion hole portion 21a from the opening on the tip side X1 of the insertion hole portion 21a of the porcelain tube 21. In this embodiment, as described above, the outer diameter of the pipe member 22 is larger than the inner diameter of the insertion hole portion 21a in a free state, so the pipe member 22 is inserted (specifically, press-fitted) into the insertion hole portion 21a while elastically expanding the insertion hole portion 21a. The pipe member 22 is inserted into the insertion hole portion 21a until it abuts against the restricting surface 211c. This positions the pipe member 22 in the axial direction X relative to the porcelain tube 21. In this manner, the pipe member 22 is assembled to the porcelain tube 21.

[0043] (Functions and Effects of the First Embodiment) In the power cable connection device 1 of this embodiment, the pipe member 22 is inserted and disposed inside the porcelain tube 21. This prevents the pipe member 22 from being fixed to the porcelain tube 21, and prevents stress from being generated in the porcelain tube 21 due to the difference in linear expansion coefficient between the porcelain tube 21 and the pipe member 22. For example, when the porcelain tube 21 attempts to expand more toward the outer periphery than the pipe member 22 and the mounting member 23, the inner peripheral portion of the porcelain tube 21 is pulled by the pipe member 22, which prevents stress from being generated in the porcelain tube 21.

[0044] Furthermore, the pipe member 22 is press-fitted into the inside of the porcelain tube 21. This increases the adhesion between the pipe member 22 and the porcelain tube 21, thereby preventing moisture from penetrating between the pipe member 22 and the porcelain tube 21.

[0045] Furthermore, the porcelain tube 21 has a restricting surface 211c that abuts against the end surface of the base end side X2 of the pipe member 22 to restrict insertion of the pipe member 22 into the porcelain tube 21. This makes it easy to position the pipe member 22 in the axial direction X with respect to the porcelain tube 21.

[0046] As described above, according to the present embodiment, it is possible to provide a power cable connection device and a method for manufacturing a power cable connection device that can suppress stress generated in a porcelain bushing.

[0047] [Second embodiment] A second embodiment of the present invention will be described with reference to Fig. 7. Fig. 7 is an enlarged cross-sectional view of a part of the power cable connection device 1 in this embodiment.

[0048] This embodiment is an embodiment in which the shape of the pipe member 22 is modified from that of the first embodiment. Specifically, the pipe member 22 of this embodiment has a rounded corner 221 between the end face of the base end side X2 and the outer circumferential surface. Note that other corners of the pipe member 22 may also be rounded.

[0049] Other configurations of this embodiment are the same as those of the first embodiment. It should be noted that, among the symbols used in the second and subsequent embodiments, the same symbols as those used in the previously described embodiments represent the same components, etc. as those in the previously described embodiments, unless otherwise specified.

[0050] (Functions and Effects of the Second Embodiment) In this embodiment, the pipe member 22 has rounded corners 221 between the end face of the base end side X2 and the outer circumferential surface. Therefore, when inserting the pipe member 22 into the insertion hole 21a, the corners 221 act as a guide, making the insertion easier. Also, when inserting the pipe member 22 into the insertion hole 21a, the corners 221 prevent the inner wall of the insertion hole 21a from being scraped. Furthermore, electric field concentration around the corners 221 of the pipe member 22 is also suppressed. In addition, the second embodiment has the same functions and effects as the first embodiment.

[0051] (Summary of the embodiment) Next, the technical ideas grasped from the above-described embodiments will be described by using the reference numerals and the like in the embodiments. However, the reference numerals and the like in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiments.

[0052] [1] A power cable connection device 1 comprising: a porcelain tube 21 into which a power cable 10 is inserted; a pipe member 22 inserted and disposed inside the porcelain tube 21 and surrounding the power cable 10; and an attachment member 23 disposed on the outer periphery of the pipe member 22 and partially embedded in the porcelain tube 21 so that an attachment surface 233 to be attached to another member is exposed from the porcelain tube 21.

[0053] [2] The power cable connection device 1 according to [1], wherein the pipe member 22 is press-fitted into the inside of the porcelain tube 21.

[0054] [3] The power cable connection device 1 described in [1] or [2], wherein the corners 221 between the end face of the pipe member 22 that is inserted into the inside of the porcelain tube 21 and the outer circumferential surface are rounded.

[0055] [4] The porcelain tube 21 has a regulating surface 211c that abuts against the end face of the pipe member 22 that is inserted inside the porcelain tube 21, thereby regulating the insertion of the pipe member 22 into the porcelain tube 21.

[0040] The power cable connection device 1 described in any one of [1] to [3].

[0056] [5] A method for manufacturing a power cable connection device (1) comprising: a porcelain tube (21) into which a power cable (10) is inserted; a pipe member (22) arranged inside the porcelain tube (21) and surrounding the power cable (10); and an attachment member (23) arranged more outer than the pipe member (22) and partially embedded in the porcelain tube (21) so that an attachment surface (233) to be attached to another member is exposed from the porcelain tube (21), the method comprising the steps of: forming the porcelain tube (21); and inserting the pipe member (22) into the porcelain tube (21) after the porcelain tube (21) is formed.

[0057] [6] The manufacturing method of the power cable connection device 1 according to [5], wherein the step of inserting the pipe member 22 into the inside of the porcelain tube 21 is a step of press-fitting the pipe member 22 into the inside of the porcelain tube 21.

[0058] [7] A method for manufacturing a power cable connection device 1 described in [5] or [6], wherein the corner 221 between the end face of the pipe member 22 that is inserted inside the porcelain tube 21 and the outer surface is rounded.

[0059] [8] The manufacturing method of the power cable connection device 1 described in any one of [5] to [7], wherein the porcelain tube 21 has a regulating surface 211c that abuts against the end face of the pipe member 22 that is inserted inside the porcelain tube 21, thereby regulating the insertion of the pipe member 22 into the porcelain tube 21.

[0060] (Addendum) Although the embodiments of the present invention have been described above, the invention according to the claims is not limited to the above-described embodiments. It should be noted that not all of the combinations of features described in the embodiments are necessarily essential to the means for solving the problems of the invention. Furthermore, the present invention can be appropriately modified and implemented within the scope of its spirit. [Explanation of symbols]

[0061] 1...Power cable connection device 10...Power cable 21...Insulator tube 211c…Regulatory aspects 22...Pipe member 221...Corner 23...Mounting member 233...Mounting surface

Claims

1. a porcelain tube into which a power cable is inserted; a pipe member that is inserted into the porcelain bushing and surrounds the power cable; an attachment member disposed on an outer circumferential side of the pipe member and partially embedded in the porcelain bushing so that an attachment surface to be attached to another member is exposed from the porcelain bushing; Power cable connection device.

2. The pipe member is press-fitted into the inside of the porcelain bushing. The power cable connection device according to claim 1 .

3. The pipe member has rounded corners between an end face on the side inserted into the porcelain bushing and an outer circumferential surface.

3. The power cable connection device according to claim 1 or 2.

4. the porcelain bushing has a restricting surface that abuts against an end surface of the pipe member that is inserted into the porcelain bushing to restrict insertion of the pipe member into the porcelain bushing; 3. The power cable connection device according to claim 1 or 2.

5. A method for manufacturing a power cable connection device comprising: a porcelain tube into which a power cable is inserted; a pipe member disposed inside the porcelain tube and surrounding the power cable; and an attachment member disposed on an outer circumferential side of the pipe member and partially embedded in the porcelain tube so that an attachment surface to be attached to another member is exposed from the porcelain tube, forming the porcelain bushing; and inserting the pipe member into the porcelain bushing after the porcelain bushing is formed. A method for manufacturing a power cable connection device.

6. the step of inserting the pipe member into the porcelain bushing is a step of press-fitting the pipe member into the porcelain bushing; A method for manufacturing the power cable connection device according to claim 5.

7. The pipe member has rounded corners between an end face on the side inserted into the porcelain bushing and an outer circumferential surface. A method for manufacturing the power cable connection device according to claim 5 or 6.

8. the porcelain bushing has a restricting surface that restricts insertion of the pipe member into the porcelain bushing by contacting an end surface of the pipe member that is inserted into the porcelain bushing; A method for manufacturing the power cable connection device according to claim 5 or 6.

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