Power cable connection device

Abstract

To provide a power cable connection device that can prevent electric field concentration in a porcelain tube, while preventing generation of stress on the porcelain tube.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 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. The porcelain tube 21 has an insulator 210, a first semiconducting part 211 provided between the insulator 210 and the pipe member 22, and a second semiconducting part 212 provided between the insulator 210 and the attachment member 23. A base end position of the pipe member 22 is closer to a leading end side X1 than the attachment member 23. The first semiconducting part 211 has a portion that radially faces the second semiconducting part 212.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a 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] Patent Document 1 discloses an example in which the pipe member is formed short so that it does not face the mounting member in the radial direction, and a portion of the porcelain tube that is sandwiched radially between the pipe member and the mounting member is not formed. If the above-mentioned portion is formed, stress due to the difference in thermal expansion coefficients of the pipe member, porcelain tube, and mounting member is likely to occur in the above-mentioned portion, but this example makes it possible to reduce the stress occurring in the porcelain tube.

[0004] In the example of Patent Document 1, the first semiconductive portion is formed short so as not to face the second semiconductive portion in the radial direction. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2022-128719 Summary of the Invention [Problem to be solved by the invention]

[0006] In the above example, the base end of the first semiconductive part, which has a relatively small radius of curvature, and the tip end of the second semiconductive part are located close to each other, so the electric field tends to concentrate in the area between the first semiconductive part and the second semiconductive part in the porcelain tube.

[0007] The present invention has been made in view of the above circumstances, and aims to provide a power cable connection device that can suppress the occurrence of stress in the porcelain tube and the concentration of electric field within the porcelain tube. [Means for solving the problem]

[0008] 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 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, wherein the porcelain tube has an insulator, a first semi-conductive portion provided between the insulator and the pipe member, and a second semi-conductive portion provided between the insulator and the attachment member, and when the side of the porcelain tube into which the power cable is inserted is defined as a base end side and the opposite side is defined as a tip end side, the base end position of the pipe member is located closer to the tip end than the attachment member, and the first semi-conductive portion has a portion radially opposed to the second semi-conductive portion. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a power cable connection device that can suppress the occurrence of stress in the porcelain bushing and the concentration of electric field inside the porcelain bushing. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view of a power cable connection device according to an 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. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Embodiment Mode] An embodiment of the present invention will be described with reference to Figures 1 to 3. 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 axial direction of the power cable connection device 1 will be referred to as the axial direction X. The axial direction X is the direction in which the central axis of the power cable 10 (i.e., the dashed line in FIG. 1 ) extends when the power cable 10 is inserted into the power cable connection device 1. One side of the axial direction X, that is, the side of the porcelain tube 21 where the power cable 10 is inserted, will be referred to as the base end side X2, and the opposite side will be referred to as the tip end side X1. In other words, the tip side X1 is the side of the power cable 10 that is inserted into the porcelain tube 21, and the base side X2 is the side of the power cable 10 that is pulled out from the porcelain tube 21. Furthermore, when simply referring to the "radial direction," it means the radial direction centered on the central axis of the power cable 10. Furthermore, one side of the radial direction, that is the direction toward the central axis of the power cable 10, is referred to as the inner circumferential side, and the opposite side is 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] The outer circumferential portion of the insulator 210 has a plurality of ridges 210a and valleys 210b to 210d formed alternately in the axial direction. In other words, the insulator 210 has ridges 210a protruding toward the outer periphery at a plurality of locations in the axial direction X, and the portions between adjacent ridges 210a on the outer circumferential surface of the porcelain tube 21 form the valleys 210b to 210d.

[0017] The multiple ridges 210a are formed to protrude outward and have an annular shape around the entire circumference of the porcelain tube 21. The multiple ridges 210a ensure a creeping distance on the outer circumferential surface of the insulator 210 and suppress the occurrence of creeping discharge along the surface of the insulator 210.

[0018] The plurality of valleys 210b-210d are formed closer to the inner periphery as they approach the tip end X1. In this embodiment, the plurality of valleys 210b-210d are formed so as to be positioned gradually more inward as they approach the tip end X1. Specifically, the plurality of valleys 210b-210d include, in order from the base end X2, two large diameter valleys 210b that are positioned at the same radial position as each other, one medium diameter valley 210c that is positioned more inward than the large diameter valleys 210b, and nine small diameter valleys 210d that are positioned more inward than the medium diameter valley 210c and are positioned gradually more inward than each other in the radial direction, and are positioned gradually more inward from the base end X2 in the order of large diameter valley 210b, medium diameter valley 210c, and small diameter valley 210d. Of the multiple valley portions 210b to 210d, the valley portions 210b to 210d (i.e., the medium diameter valley portion 210c and the small diameter valley portion 210d) other than the one located on the outermost side (i.e., the large diameter valley portion 210b) are formed at positions away from the mounting member 23 toward the tip side X1.

[0019] 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.

[0020] 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.

[0021] 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 detailed shape of the first semiconductive portion 211 will be described later. The first semiconductive portion 211 is formed, for example, by insert molding in which the pipe member 22 is placed in a mold. In this way, the first semiconductive portion 211 is fixed to the mounting member 23.

[0022] 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.

[0023] 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.

[0024] The pipe member 22 is disposed on the inner peripheral surface of the porcelain tube 21. The pipe member 22 is formed from a metal such as brass or an aluminum alloy 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 peripheral side of the porcelain tube 21 and reinforces the porcelain tube 21, which has flexibility.

[0025] 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 later.

[0026] FIG. 2 is an enlarged view of a portion of FIG. 1. As shown in FIGS. 1 and 2, the base end of the pipe member 22 is located closer to the tip end (X1) than the mounting member 23. By shifting the pipe member 22 and the mounting member 23 in the axial direction (X) in this manner, stress generated in the porcelain tube 21 can be reduced. For example, unlike the present embodiment, when the pipe member 22 and the mounting member 23 are radially opposed to each other, the interposed portion of the porcelain tube 21, which is a portion of the porcelain tube 21 sandwiched between the pipe member 22 and the mounting member 23 in the radial direction, is prone to stress due to the inhibition of thermal expansion and contraction in the radial direction. In particular, when both the pipe member 22 and the mounting member 23 are fixed to the porcelain tube 21, stress is likely to be generated when the interposed portion is pulled by the mounting member 23 when the porcelain tube 21 thermally contracts, and stress is likely to be generated when the interposed portion is pulled by the pipe member 22 when the porcelain tube 21 thermally expands. On the other hand, in this embodiment, the base end position of the pipe member 22 is located at a position X1 closer to the tip end than the mounting member 23, and therefore it is possible to suppress the occurrence of the above-mentioned stress. As shown in Fig. 2, from the viewpoint of suppressing stress occurring in the porcelain tube 21, it is preferable that the length L1 in the axial direction X between the pipe member 22 and the mounting member 23 is greater than the length L2 in the radial direction between the pipe member 22 and the mounting member 23.

[0027] Furthermore, if the base end position of the pipe member 22 is too far away from the mounting member 23 toward the tip side X1, the reinforcing function of the pipe member 22 for the porcelain tube 21 may be impaired. Therefore, as shown in Fig. 1, the base end position of the pipe member 22 is preferably located on the base end side X2 of the axial center position C of the portion of the porcelain tube 21 that is closer to the tip side X1 than the mounting member 23. Furthermore, it is preferable to design the base end position of the pipe member 22 so that the pipe member 22 is located on the inner circumferential side of the innermost valley portion of the plurality of valley portions 210b to 210d (i.e., the plurality of small diameter valley portions 210d). This is because the portion of the porcelain tube 21 where the small diameter valley portion 210d is located among the plurality of valley portions 210b to 210d is thin-walled and therefore particularly requires reinforcement.

[0028] The inner diameter of the pipe member 22 is formed to be 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.

[0029] As described above, the first semiconductive portion 211 is interposed between the pipe member 22 and the insulator 210. The first semiconductive portion 211 has a cylindrical surrounding portion 211a that surrounds the outer circumferential surface of the pipe member 22, and an extension portion 211b that extends 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, except for the tip end portion.

[0030] The extension portion 211b is formed to extend radially inward beyond the pipe member 22 and has a thickness greater than that of the surrounding portion 211a. The extension portion 211b is interposed between the insulator 210 and the power cable 10 inserted inside the pipe member 22. The extension portion 211b has a portion that faces radially the second semiconductive portion 212. In this embodiment, the extension portion 211b is formed radially outward beyond the mounting member 23 to extend to the base end side X2 so as to face radially the entire inner circumferential surface of the mounting member 23.

[0031] 2, 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. The mounting member 23 includes a cylindrical tubular portion 231 and an annular protruding portion 232 formed so as to protrude from the end of the base end side X2 of the tubular portion 231 toward the outer periphery side.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] (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.

[0036] 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.

[0037] (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.

[0038] 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.

[0039] 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.

[0040] (Power Cable 10) Fig. 3 is a cross-sectional view taken along line III-III in Fig. 1. As shown in Fig. 3, 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.

[0041] 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.

[0042] (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.

[0043] (Actions and Effects of the Embodiments) In the power cable connection device 1 of this embodiment, the base end position of the pipe member 22 is located closer to the tip side X1 than the mounting member 23. This prevents the formation of a portion in the porcelain tube 21 that is radially sandwiched between the pipe member 22 and the mounting member 23, thereby suppressing stress in the porcelain tube 21 due to differences in linear expansion coefficients between the porcelain tube 21 and the pipe member 22 and the mounting member 23. Furthermore, the first semiconductive portion 211 has a portion that faces the second semiconductive portion 212 in the radial direction. Therefore, for example, the end portion on the base end side X2 of the first semiconductive portion 211 and the end portion on the tip side X1 of the second semiconductive portion 212, which have a relatively small radius of curvature, are prevented from becoming close to each other, thereby suppressing electric field concentration in the portion of the porcelain tube 21 between the first semiconductive portion 211 and the second semiconductive portion 212.

[0044] Furthermore, the length L1 between the pipe member 22 and the mounting member 23 in the axial direction X is greater than the length L2 between the pipe member 22 and the mounting member 23 in the radial direction. By separating the pipe member 22 and the mounting member 23 relatively far in the axial direction X in this manner, stress generated in the porcelain tube 21 due to differences in the linear expansion coefficient between the porcelain tube 21 and the pipe member 22 and the mounting member 23 is further suppressed.

[0045] The plurality of valleys 210b-210d are formed closer to the tip end X1 than the valleys 210b-210d located most radially outward (i.e., the large-diameter valley 210b), and the base end of the pipe member 22 is located closer to the tip end X1 than the valleys 210b-210d located most radially outward (i.e., the large-diameter valley 210b). This prevents the reinforcing function of the pipe member 22 for the porcelain tube 21 from being impaired.

[0046] Furthermore, the base end position of the pipe member 22 is located closer to the base end X2 than the axial center position C of the portion of the porcelain tube 21 that is closer to the tip end X1 than the mounting member 23. Therefore, the reinforcing function of the porcelain tube 21 by the pipe member 22 is prevented from being impaired.

[0047] As described above, according to this embodiment, it is possible to provide a power cable connection device that can suppress the occurrence of stress in the porcelain bushing and the concentration of electric fields inside the porcelain bushing.

[0048] (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.

[0049] [1] 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 a mounting member 23 arranged on the outer periphery side of the pipe member 22 and partially embedded in the porcelain tube 21 so that a mounting surface 233 to be mounted on another member is exposed from the porcelain tube 21, and the porcelain tube 21 is provided between an insulator 210 and the pipe member 22. and a second semi-conductive portion 212 provided between the insulator 210 and the mounting member 23, wherein when a side of the porcelain tube 21 into which the power cable 10 is inserted is defined as a base end side X2 and the opposite side is defined as a tip end side X1, a base end position of the pipe member 22 is closer to the tip end side X1 than the mounting member 23, and the first semi-conductive portion 211 has a portion radially opposed to the second semi-conductive portion 212.

[0050] [2] The power cable connection device 1 described in [1], wherein the length L1 between the pipe member 22 and the mounting member 23 in the axial direction X is greater than the length L1 between the pipe member 22 and the mounting member 23 in the radial direction.

[0051] [3] The power cable connection device 1 according to [1] or [2], wherein an outer circumferential portion of the insulator 210 has a plurality of peaks 210a and a plurality of valleys 210b to 210d formed alternately in the axial direction X, the plurality of valleys 210b to 210d being formed closer to the inner circumferential side as they approach a tip end X1, and the base end position of the pipe member 22 is located closer to the tip end X1 than the valley 210b located most outward among the valleys 210b to 210d.

[0052] [4] The power cable connection device 1 described in any one of [1] to [3], wherein the base end position of the pipe member 22 is located on the base end side X2 of the axial center position C of the portion of the porcelain tube 21 that is on the tip side X1 of the mounting member 23.

[0053] (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]

[0054] 1...Power cable connection device 10...Power cable 21...Insulator tube 210...Insulator 210a...Yamabe 210b...Large diameter valley (valley) 210c…Medium diameter valley (trough) 210d...Narrow valley section (valley section) 211...First semiconductive part 212...Second semiconductive part 22...Pipe member 23...Mounting member 233...Mounting surface C…Axial center position X…Axis direction X1...Tip side X2…Proximal side

Claims

1. a porcelain tube into which a power cable is inserted; a pipe member disposed inside the porcelain bushing and surrounding the power cable; an attachment member that is disposed on an outer circumferential side of the pipe member and is partially embedded in the porcelain bushing so that an attachment surface to be attached to another member is exposed from the porcelain bushing, the porcelain bushing includes an insulator, a first semiconductive portion provided between the insulator and the pipe member, and a second semiconductive portion provided between the insulator and the mounting member, When the side of the porcelain bushing into which the power cable is inserted is defined as a base end side and the opposite side is defined as a tip end side, the base end position of the pipe member is located closer to the tip end side than the mounting member, the first semiconductive portion has a portion facing the second semiconductive portion in a radial direction; Power cable connection device.

2. a length between the pipe member and the mounting member in the axial direction is greater than a length between the pipe member and the mounting member in the radial direction; The power cable connection device according to claim 1 .

3. the outer circumferential portion of the insulator has a plurality of peaks and valleys alternately formed in the axial direction, The plurality of valleys are formed closer to the inner periphery as they approach the tip, The base end position of the pipe member is located on the tip side of the valley portion located on the outermost side of the valley portions.

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

4. The base end position of the pipe member is located on the base end side of the axial center position of a portion of the porcelain bushing that is on the tip side of the mounting member.

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

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