Cylindrical Cutout

Abstract

To achieve a lightweight cylindrical cutout.SOLUTION: A cylindrical cutout is connected to a distribution line and a high-voltage device side wiring. The cylindrical cutout includes an upper cutout body that is formed of an insulating material and has an upper electrode inside that is connected to both the distribution line and a fuse cylinder and a lower cutout body that is formed of an insulating material and has a lower electrode inside that is connected to both the high-voltage device side wiring and the fuse cylinder.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This specification discloses a technique relating to a cylindrical cutout that is connected to a power distribution line and high-voltage equipment wiring. [Background technology]

[0002] To protect a transformer or the like, a cylindrical cutout is arranged between a distribution line and wiring on the high-voltage equipment side. Typically, a cylindrical cutout has a cylindrical cutout body made of ceramic (porcelain). Patent Document 1 discloses a cylindrical cutout in which a portion of the cylindrical cutout body is made of resin (or rubber) in order to reduce the weight of the cylindrical cutout. Specifically, in this patent document, the portion that houses the power fuse is made of ceramic, and the portion that houses the lead wires for connecting to the distribution line and the equipment is made of resin (or rubber), thereby reducing the weight of the cylindrical cutout. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-186208 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, the cylindrical cutout of Patent Document 1 has succeeded in reducing the weight of the cylindrical cutout by using resin for the portions of the cylindrical cutout body that house the power distribution line side and the equipment side lead wires. However, to improve the efficiency of installation work, there is a demand for further weight reduction of cylindrical cutouts. The purpose of this specification is to provide a technology for realizing a cylindrical cutout that is lighter than conventional cutouts. [Means for solving the problem]

[0005] The cylindrical cutout disclosed in this specification is connected to a power distribution line and high-voltage equipment wiring, and includes an upper cutout body made of an insulating material and having an upper electrode therein that connects to both the power distribution line and the fuse barrel, and a lower cutout body made of an insulating material that has a lower electrode therein that connects to both the high-voltage equipment wiring and the fuse barrel. [Brief explanation of the drawings]

[0006] [Figure 1] 1 shows a cross-sectional view of a cylindrical cutout. [Figure 2] FIG. 10 shows a side view of the top cutout body. [Figure 3] 1 shows a partial cross-sectional view of the upper cutout body. [Figure 4] FIG. 1 shows a front view of the upper cutout body. [Figure 5] 1 shows a partial cross-sectional view of a cylindrical cutout. [Figure 6] A cross-sectional view taken along line VI-VI in FIG. 2 is shown. [Figure 7] A cross-sectional view taken along line VII-VII in FIG. 2 is shown. [Figure 8] 10 shows the cylindrical cutout with the fixing member attached. [Figure 9] FIG. 10 shows a side view of the lower cutout body. [Figure 10] FIG. 1 shows a front view of the lower cutout body. [Figure 11] 1 shows an enlarged partial view of the lower cutout body. [Figure 12] 1 shows a rear view of the upper cutout body. [Figure 13] A front view of the opening and closing cover is shown. [Figure 14] 1 shows a variation of the cylindrical cutout (top cutout body). [Figure 15] 1 shows a variation of the cylindrical cutout (lower cutout body). DETAILED DESCRIPTION OF THE INVENTION

[0007] (cylindrical cutout) The cylindrical cutout is connected between a power distribution line and a high-voltage device such as a transformer via an external electric wire. The cylindrical cutout includes a cylindrical cutout body and a fuse barrel (power fuse) disposed within the cylindrical cutout body. The power fuse is connected to an upper electrode and a lower electrode disposed within the cylindrical cutout body. The upper electrode is connected to the power distribution line, and the lower electrode is connected to the wiring on the high-voltage device side.

[0008] (Cylindrical cutout body) The cylindrical cutout body is made of an insulating material (resin). Specifically, the cylindrical cutout body is composed of an upper cutout body made of an insulating material and a lower cutout body made of an insulating material. An example of the insulating material is an ethylene-based resin with added carbon black. An upper electrode is housed in the upper cutout body, and a lower electrode is housed in the lower cutout body. Such a cylindrical cutout body can be made lighter in weight than a conventional cylindrical cutout body that is partially or entirely made of ceramic.

[0009] A cylindrical covering portion may be provided on one of the upper cutout body and the lower cutout body, and a cylindrical insert portion may be provided on the other. For example, if the upper cutout body is provided with a covering portion and the lower cutout body is provided with an insert portion, the upper cutout body and the lower cutout body are fixed together when the insert portion is inserted into the covering portion. That is, the covering portion covers the lower cutout body (insertion portion). A power fuse is disposed in the insertion portion. Furthermore, the covering portion and the insert portion may be fixed together by providing a groove on one of the covering portion and a protrusion on the other, and engaging the groove with the protrusion. This eliminates the need for adhesives, fasteners, etc. for fixing the upper cutout body and the lower cutout body. This reduces the number of parts in the cylindrical cutout and makes it easier to disassemble (sort) the cylindrical cutout when disposing of it.

[0010] When the upper cutout body is provided with a covering portion and the lower cutout body is provided with an insert portion, the upper electrode may be fixed to the upper cutout body while contacting the insert portion. That is, the upper electrode may be sandwiched between the upper cutout body and the insert portion (part of the lower cutout body) and fixed (positioned) within the upper cutout body. This eliminates the need for adhesives, fasteners, etc. for fixing the upper electrode to the upper cutout body. This reduces the number of parts in the cylindrical cutout and makes it easier to disassemble the cylindrical cutout when disposing of it.

[0011] (Top cutout body) The upper cutout body may be provided with an upper umbrella portion for increasing the creepage distance of the outer surface of the cylindrical cutout. This can improve the insulating performance of the cylindrical cutout. Furthermore, a first protrusion protruding radially outward may be provided at a radial end of the upper umbrella portion. In this case, a circumferential portion of the first protrusion may be provided at a higher position than the other portions. Furthermore, another circumferential portion of the first protrusion may be provided at a lower position than the other portions. The first protrusion may be inclined from an upper position to a lower position. In this case, water droplets (rainwater, etc.) adhering to the upper umbrella portion flow over the first protrusion from the upper position to the lower position.

[0012] When the upper cutout body is provided with a covering portion and the lower cutout body is provided with an insertion portion, an insertion hole into which a portion of the upper electrode is inserted may be provided at the upper end of the insertion portion. For example, the upper electrode may have a pair of gripping portions for gripping a power fuse, and the pair of gripping portions may be inserted into the insertion hole. This allows for more reliable positioning of the upper electrode within the cylindrical cutout body. Also, this allows for more reliable engagement between the upper electrode and the upper side electrode of the power fuse disposed within the insertion portion.

[0013] As described above, the upper electrode is connected to the power distribution line. The upper cutout body, the upper electrode, and the lower cutout body can be more firmly fixed together using a fixing member for connecting (fixing) the upper electrode to the power distribution line. Specifically, a connecting portion for connecting the pair of gripping portions is formed in the upper electrode. A through hole (first through hole) is then formed in the connecting portion. A through hole (second through hole) communicating with the outside of the upper cutout body is also formed in the upper cutout body. The second through hole is formed in a position facing the connecting portion (first through hole) of the upper electrode. Furthermore, an upper surface portion for closing a portion of the upper end of the insertion portion is formed in the lower cutout body. A through hole (third through hole) is then formed in the upper surface portion. The third through hole is also formed in a position facing the connecting portion (first through hole) of the upper electrode. A fixing member for connecting the upper electrode to the power distribution line is then passed through the first, second, and third through holes and fixed to the fixed portion of the power distribution line. As a result, the upper cutout body, the upper electrode, and the lower cutout body are fixed by the fixing member.

[0014] When the upper cutout body is provided with a covering portion and the lower cutout body is provided with an insertion portion, a mounting bracket for attaching the cylindrical cutout to another member (such as a utility pole) may be fixed to the covering portion. In this case, the surface of the covering portion may be provided with a first restricting portion that protrudes toward the outside of the covering portion and restricts vertical movement of the mounting bracket, and a second restricting portion that protrudes toward the outside of the covering portion and restricts circumferential movement of the mounting bracket. This allows the mounting bracket to be firmly attached to the cylindrical cutout. In other words, the cylindrical cutout can be positioned relative to the mounting bracket.

[0015] The first restricting portion may be provided on at least one of both side surfaces of the cylindrical cutout in a first direction perpendicular to the axis of the cylindrical cutout. The second restricting portion may be provided on at least one of both side surfaces of the cylindrical cutout in a second direction perpendicular to the axis of the cylindrical cutout and the first direction. In other words, the first restricting portion and the second restricting portion may be provided at positions offset by approximately 90 degrees in the circumferential direction of the cylindrical cutout. This makes it possible to avoid overlapping between the portion restricting vertical movement of the cylindrical cutout and the portion restricting circumferential movement of the cylindrical cutout.

[0016] The first restricting portion may be a pair of protrusions spaced apart in the vertical direction of the covering portion. The second restricting portion may also be a pair of protrusions spaced apart in the circumferential direction of the covering portion. In this case, the second restricting portion is provided on both sides in the second direction, and the spacing between the pair of protrusions on one side may be narrower than the spacing between the pair of protrusions on the other side. Typically, the mounting bracket is attached to the cylindrical cutout by tightening the front end (the side farther from the workpiece (such as a utility pole) to which the cylindrical cutout is attached) with a bolt. By providing a second restricting portion with narrow protrusion spacing on one side, the bolt tightening margin can be ensured. In this case, the pair of protrusions on one side engage with a bent portion of the mounting bracket on the side opposite the workpiece to which the cylindrical cutout is attached. The pair of protrusions on the other side engage with a bent portion of the mounting bracket on the side of the workpiece to which the cylindrical cutout is attached.

[0017] (Bottom cutout body) The lower cutout body may have a cylindrical portion that houses the lower electrode. The cylindrical portion may have a cylindrical protrusion through which high-voltage equipment wiring connected to the lower electrode passes. The protrusion may extend radially outward from the outer circumferential surface of the cylindrical portion. The radial size of the cylindrical portion may be smaller than the radial size of the upper umbrella portion. This prevents the cylindrical portion from getting wet with rainwater, etc.

[0018] (Lower umbrella part) In addition to the upper cutout body and the lower cutout body, the cutout body may have an umbrella member (lower umbrella portion) attached to the covering portion of the upper cutout body to increase the outer surface length of the cylindrical cutout in the vertical direction. Attaching an umbrella member to the covering portion can further improve the insulating performance of the cylindrical cutout. When the umbrella member is attached to the covering portion, a fixing portion may be provided on the outer surface of the covering portion to fix the umbrella member to the covering portion. Parts (bolts, etc.) for fixing the umbrella member to the covering portion (upper cutout body) can be omitted. When the umbrella portion (upper umbrella portion) is provided on the upper cutout body, the umbrella member may be provided below the upper umbrella portion. In other words, when the umbrella portion () is provided on the upper cutout body, the umbrella portion attached to the upper cutout body can be considered as the lower umbrella portion. Furthermore, a second protrusion protruding radially outward may be provided at the radial end of the lower umbrella portion. [Example]

[0019] (First Example) Referring to FIG. 1, a high-voltage cutout 100 will be described. The high-voltage cutout 100 is installed on a power distribution line and is used to protect equipment such as transformers. The exterior of the high-voltage cutout 100 is mainly composed of a resin upper cutout body 30, a resin lower cutout body 70, and a resin lower umbrella portion 50. The upper cutout body 30, the lower cutout body 70, and the lower umbrella portion 50 are formed of an insulating material containing an ethylene-based material. Specifically, the insulating ethylene-based material is an ethylene-based resin with added carbon black. As will be described in detail later, the upper cutout body 30 and the lower cutout body 70 are fixed together, and the lower umbrella portion 50 is fixed to the upper cutout body 30.

[0020] The high-voltage cutout 100 is installed so that the upper cutout body 30 is on the upper side and the lower cutout body 70 is on the lower side in the direction of gravity. A fuse cylinder 8 and an arc-extinguishing cylinder 6 are arranged inside the high-voltage cutout 100. The fuse cylinder 8 is arranged inside the arc-extinguishing cylinder 6. The fuse cylinder 8 extends in the vertical direction and connects the upper electrode 4 and the lower electrode 12. A fuse 10 is arranged inside the fuse cylinder 8. A conical upper molded cone 3 is fixed to the top of the upper cutout body 30. A lead wire 1 passes through the upper molded cone 3. The lead wire 1 is electrically connected to the upper electrode 4 and is connected to a power distribution line. A lower molded cone 16 is fixed to the side of the lower cutout body 70. A lead wire 18 passes through the lower molded cone 16. The lead wire 18 is electrically connected to the lower electrode 12 via a connection plate 14 and is connected to equipment such as a transformer. Each of the components that make up the high voltage cutout 100 will now be described in detail.

[0021] The upper cutout body 30 will be described with reference to FIGS. 2 to 4. As shown in FIG. 2, the upper cutout body 30 mainly comprises an upper umbrella portion 32 and a covering portion 36. The covering portion 36 is cylindrical and covers a portion of the lower cutout body 70. The lower cutout body 70 will be described in detail below. A protrusion 31 is provided at the upper end of the upper umbrella portion 32, i.e., the upper end of the upper cutout body 30. The upper umbrella portion 32 widens in diameter from top to bottom, and a first protrusion 34 is provided at the radial end of the lower end (see also FIG. 1). The first protrusion 34 runs around the outer periphery of the upper umbrella portion 32 and has an inclined portion 34c that slopes from the upper portion 34a to the lower portion 34b. The upper portion 34a is located higher than the other portions of the first protrusion 34. The lower portion 34b is located lower than the other portions of the first protrusion 34. As shown in FIG. 1, a protrusion (second protrusion) 54 is also provided at the radial end of the lower end of the lower umbrella portion 50.

[0022] The covering portion 36 is provided below the upper umbrella portion 32. A first restricting portion 36a and second restricting portions 36b and 36c are provided on the outer peripheral surface of the covering portion 36. The first restricting portion 36a and the second restricting portions 36b and 36c all protrude radially outward from the outer peripheral surface of the covering portion 36. The first restricting portion 36a and the second restricting portions 36b and 36c are used to secure a mounting bracket (described later). A fixing portion 38 is fitted into the outer peripheral surface of the covering portion 36 from its lower end. The fixing portion 38 is used to secure the lower umbrella portion 50, which functions as an umbrella member of the high-pressure cutout 100 (see also FIG. 1). The fixing portion 38 is an annular member made of rubber. An annular slit notch is formed in the fixing portion 38. The lower umbrella portion 50 is fixed to the covering portion 36 (upper cutout main body 30) by fitting the upper end of the lower umbrella portion 50 into the slit notch. A pair of grooves 40 is provided at the lower end of the covering portion 36. The pair of grooves 40 are provided at positions symmetrical with respect to the axis of the covering portion 36. Each groove 40 is a T-shaped notch, and is used to fix the lower cutout body 70.

[0023] As shown in Figures 3 and 4, an upper wire accommodating portion 31a having the same inner diameter as the protrusion 31 is provided above the upper cutout body 30. The lower cylindrical portion of the upper molded cone 3 is inserted into the upper wire accommodating portion 31a. A protrusion 42 protruding radially inward is provided on the wall surface of the upper wire accommodating portion 31a. Two protrusions 42 are provided on the wall surface of the upper wire accommodating portion 31a, and the protrusions 42, 42 are provided symmetrically with respect to the center of the upper wire accommodating portion 31a. The pair of protrusions 42 fit into a pair of recesses (not shown) provided on the outer peripheral surface of the lower cylindrical portion of the upper molded cone 3. The fit between the pair of protrusions 42 and the pair of recesses prevents the upper wire from rotating relative to the upper cutout body 30 (high-voltage cutout 100). A sloped portion 46 whose inner diameter decreases upward is provided at the top of the sheath portion 36. Further, above the inclined portion 46, a restricting step portion 45 having an inner diameter smaller than the minimum diameter of the inclined portion 46 is provided.

[0024] The inclined portion 46 is used to guide an insertion portion 74 (see also FIG. 9 ) of a lower cutout body 70 (described later) to the center of the covering portion 36 when the insertion portion 74 is inserted into the covering portion 36. The restricting step 45 is used to prevent the insertion portion 74 from contacting an upper end step 45a of the covering portion 36. Specifically, the insertion portion 74 normally contacts the restricting step 45 but does not contact the upper end step 45a. The upper electric wire accommodating portion 31a and the space within the covering portion 36 are connected by a through hole (second through hole) 44. The second through hole 44 is used to fix the upper electrode 4.

[0025] The inner circumferential surface of the upper umbrella portion 32 is provided with downwardly extending folds 33. The lower ends of the folds 33 are located higher than the lower end (first protrusion 34) of the upper umbrella portion 32. Therefore, when the upper cutout body 30 is observed from the side, the folds 33 are not visible (see also FIG. 2). The provision of the folds 33 increases the creepage distance of the outer surface of the high-voltage cutout 100, improving the insulating performance of the high-voltage cutout 100. The inner circumferential surface of the lower umbrella portion 50 is provided with downwardly extending folds 50a. The lower ends of the folds 50a are located higher than the lower end of the lower umbrella portion 50. Therefore, when the upper cutout body 30 is observed from the side, the folds 50a are not visible. The provision of the folds 50a increases the creepage distance of the outer surface of the high-voltage cutout 100, improving the insulating performance of the high-voltage cutout 100.

[0026] Next, referring to FIG. 5, the state in which the lead wire 1 and upper electrode 4 are fixed to the upper cutout body 30 will be described. The upper molded cone 3 is attached to the upper cutout body 30 so as to cover the protrusion 31. This prevents rainwater from entering the high-voltage cutout 100 through the upper wire housing 31a. The lead wire 1, which is connected to the power distribution line, is fixed to a metal fixing member 5 located within the lower cylindrical portion of the upper molded cone 3. The upper electrode 4 is fixed to the fixing member 5 with a bolt 7. More specifically, the upper electrode 4 is composed of a pair of gripping portions 11 that grip the fuse barrel 8 and a connecting portion 13 that connects the pair of gripping portions 11. The bolt 7 has a threaded portion 7a, a cylindrical portion 7b, and a disk-shaped locking portion 7c, and the threaded portion 7a is screwed into the fixing member 5 of the upper molded cone 3. The cylindrical portion 7b passes through a through hole 75 of an insertion portion 74 of a lower cutout body 70, which will be described later, and the locking portion 7c is configured to lock onto an upper surface portion 72 of the insertion portion 74 of the lower cutout body 70, which will be described later. A through hole (first through hole) 13a is provided in the connecting portion 13. Furthermore, as will be described in detail later, a through hole (third through hole) 75 is provided in the center of the tip of the insertion portion 74 of the lower cutout body 70. Furthermore, an insertion hole 73 is provided around the through hole 75 for inserting the gripping portion 11 of the upper electrode 4. In the high-voltage cutout 100, with the gripping portion 11 inserted into the insertion hole 73, the tip of the insertion portion 74 is brought into contact with the restricting step portion 45, and the bolt 7 is passed through the through holes 13a, 44, and 75 from the inside of the insertion portion 74 to secure it to the fixing member 5. That is, the lower cutout body 70 and the upper electrode 4 are fixed together to the fixing member 5 by the bolt 7, and the upper mold cone 3 is attached to the upper cutout body 30. When the bolt 7 is fixed, the connecting portion 13 of the upper electrode 4 is positioned within the space formed by the upper end step portion 45a.

[0027] Next, with reference to Figures 6 to 8, the features of the covering portion 36 of the upper cutout main body 30 (features of the first restricting portion 36a and the second restricting portions 36b, 36c) will be described. The covering portion 36 is provided below the upper umbrella portion 32. The outer peripheral surface of the covering portion 36 is provided with the first restricting portion 36a, the second restricting portion 36b, and the fixing portion 38. The first restricting portion 36a, the second restricting portion 36b, and the fixing portion 38 all protrude radially outward from the outer peripheral surface of the covering portion 36. The first restricting portion 36a and the second restricting portion 36b are used to firmly secure the mounting bracket 90.

[0028] As shown in Fig. 6, first restricting portions 36a are provided at two locations on the circumferential surface of the covering portion 36. The first restricting portions 36a are provided at positions symmetrical with respect to the center of the covering portion 36. That is, the first restricting portions 36a are provided on both sides in a direction (first direction) perpendicular to the axis of the covering portion 36 (the axis of the high-voltage cutout 100). Also, as shown in Fig. 8, in each portion (two locations in the first direction) where the first restricting portions 36a are provided, two first restricting portions 36a are provided spaced apart in the up-down direction of the covering portion 36. The upper and lower first restricting portions 36a restrict vertical movement of the mounting bracket 90 when the mounting bracket 90 is attached to the covering portion 36.

[0029] As shown in FIG. 7, the second restricting portions 36b and 36c are also provided at two locations on the circumferential surface of the covering portion 36. Specifically, the second restricting portions 36b and 36c are provided at positions symmetrical with respect to the center of the covering portion 36. The second restricting portions 36b and 36c are provided in a direction (second direction) perpendicular to the axis of the covering portion 36 (the axis of the high-pressure cutout 100) and the direction in which the first restricting portions 36a and 36a are provided (first direction). As is clear from FIGS. 7 and 8, the two second restricting portions 36b extend in the vertical direction and are spaced apart from each other in the circumferential direction of the covering portion 36. The distance (circumferential distance) between the second restricting portions 36b and 36b is narrower than the distance between the second restricting portions 36c and 36c.

[0030] As shown in FIG. 8 , the mounting bracket 90 has a portion (arc portion) that follows the outer periphery of the sheathed portion 36, and the straight portion at the tip end is fixed with a bolt 91. Typically, the bolt 91 is fastened to the portion (straight portion) that is away from the workpiece to which the high-voltage cutout 100 is attached, such as a utility pole. In the high-voltage cutout 100, the boundary portion (bent portion) between the arc portion and the straight portion at the tip end engages with the second restricting portion 36b, and the boundary portion (bent portion) between the arc portion and the straight portion on the workpiece side engages with the second restricting portion 36c. When the mounting bracket 90 is attached to the sheathed portion 36, each bent portion of the mounting bracket 90 engages with the second restricting portion 36b and the second restricting portion 36c, respectively, thereby restricting rotation of the mounting bracket 90 relative to the sheathed portion 36.

[0031] As is clear from Figure 8, in the high-voltage cutout 100, the upper portion 34a of the first protrusion 34 covers the straight portion of the mounting fitting 90. In other words, the lower portion 34b of the first protrusion 34 covers the arc portion of the mounting fitting 90. Rainwater adhering to the upper umbrella portion 32 falls from the lower portion 34b of the first protrusion 34. This prevents rainwater from falling from the upper umbrella portion 32 onto the mounting fitting 90 (straight portion). As a result, flashover between the outer surface (upper umbrella portion 32) of the high-voltage cutout 100 and the mounting fitting 90 can be prevented. In other words, the voltage resistance performance can be improved.

[0032] Next, the lower cutout body 70 will be described with reference to Figures 9 to 12. As shown in Figure 9, the lower cutout body 70 has a large-diameter cylindrical portion 78 and a tubular insertion portion 74 that is smaller in diameter than the cylindrical portion 78 and extends upward from the cylindrical portion 78. The cylindrical portion 78 houses the lower electrode 12 (see also Figure 1). The insertion portion 74 is inserted into the covering portion 36 of the upper cutout body 30. The fuse cylinder 8 and the arc-extinguishing cylinder 6 are also disposed within the insertion portion 74.

[0033] A pair of engagement portions 76 that engage with the grooves 40 (see FIG. 2) of the covering portion 36 is provided on the outer peripheral surface of the lower end of the insert portion 74. The pair of engagement portions 76 are provided at positions symmetrical with respect to the axis of the insert portion 74. The pair of engagement portions 76 are protrusions that protrude radially outward from the outer peripheral surface of the lower end of the insert portion 74. By engaging each engagement portion 76 with each groove 40 and fixing them with a thermoplastic adhesive or the like, the lower cutout body 70 can be prevented from rotating relative to the upper cutout body 30. As described above, the lower cutout body 70 (insertion portion 74) is fixed to the upper cutout body 30 using bolts 7 (see also FIG. 5). The engagement portions 76 and the grooves 40 can be considered auxiliary fixing portions that auxiliary fix the lower cutout body 70 and the upper cutout body 30. As shown in FIG. 11, the engagement portion 76 has a protrusion 76a and a recess 76b formed around the protrusion 76a. By fixing the convex portion 76a and concave portion 76b of the engaging portion 76 to the T-shaped notch (groove portion 40) of the covering portion 36 with a thermoplastic adhesive or the like, the upper cutout body 30 is fixed to the lower cutout body 70, and movement in the vertical and rotational directions is prevented.

[0034] As shown in FIG. 10 , a through hole (third through hole) 75 is provided in the upper surface 72 of the insertion portion 74. As described above, the cylindrical portion 7b of the bolt 7 passes through the through hole 75, and the cylindrical portion 7a of the bolt 7 is screwed to the fixing member 5 of the upper mold cone 3 (see also FIG. 5 ). When screwed, the locking portion 7c of the bolt 7 comes into contact with the inner surface of the upper surface 72 of the insertion portion 74, thereby fixing the upper mold cone 3 and the lower cutout body 70. This fixes the upper cutout body 30 and the lower cutout body 70. In addition, two insertion holes 73 are provided in the upper surface 72 around the through hole 75. Each insertion hole 73 is positioned symmetrically with respect to the center of the through hole 75. The size of each insertion hole 73 is larger than the size of the tip (upper end) of the gripping portion 11 of the upper electrode 4. More specifically, the gripping portions 11 of the upper electrode 4 are formed slightly larger than the tips of the gripping portions 11 of the upper electrode 4 so that the gripping portions 11 of the upper electrode 4 can rotate slightly relative to the insertion portion 74. This allows the gripping portions 11 of the upper electrode 4 to rotate about the axis of the bolt 7 within the range of the difference between the size of the insertion hole 73 and the size of the gripping portions 11. Note that when the bolt 7 is fixed to the fixing member 5, the pair of gripping portions 11 of the upper electrode 4 pass through the insertion hole 73. Therefore, the gripping portions 11 are present inside the insertion portion 74. As a result, the gripping portions 11 can grip the fuse cylinder 8 arranged in the insertion portion 74.

[0035] As shown in FIG. 9, a protrusion 80 for attaching the lower molded cone 16 is provided on the circumferential surface of the cylindrical portion 78 (see also FIG. 1). The protrusion 80 is cylindrical and prevents the lower molded cone 16 from getting wet with rainwater. The lead wire 18, which is connected to a device such as a transformer, is fixed to a metal fixing member 16b located in the lower wire housing portion 16a of the lower molded cone 16. One end of the connection plate 14 is fixed to the fixing member 16b with a bolt 16c, and the other end is screwed to the lower electrode 12. A protruding fold (not shown) is formed on the outer periphery of the lower molded cone 16. The protruding fold comes into contact with the inner circumferential surface of the protrusion 80 when the lower molded cone 16 is inserted into the protruding portion 80. The protruding fold prevents rainwater from entering the interior of the lower molded cone 16. A through-hole 84 communicating the inside and outside of the cylindrical portion 78 is provided on the circumferential surface of the cylindrical portion 78. The through-hole 84 is provided in the center of the portion surrounded by the protrusion 80. The fixing member 16b passes through the through-hole 84.

[0036] Additionally, two protrusions 82 are provided inside the protruding portion 80, protruding radially outward from the outer circumferential surface of the cylindrical portion 78. The protrusions 82, 82 are provided symmetrically with respect to the center of the through-hole 84. The protrusions 82 fit into recesses provided on the outer circumferential surface of the lower electric wire (not shown). The protrusions 82 prevent the lower electric wire from rotating relative to the lower cutout body 70 (high-voltage cutout 100). In the high-voltage cutout 100, the connecting plate 14 is brought into contact with the inner surface of the cylindrical portion 78 with the fixing member 16b inserted into the through-hole 84, and the lower mold cone 16 and the connecting plate 14 are fixed to the cylindrical portion 78 with bolts 16c (see also FIG. 1). An open / close lid 88 is attached to the lower portion 86 of the cylindrical portion 78.

[0037] FIG. 12 shows an end surface 86a of the lower portion 86 of the cylindrical portion 78. Six screw holes 86b are formed in the end surface 86a. The screw holes 86b are used to secure the open-close lid 88 to the cylindrical portion 78. As shown in FIG. 13, the open-close lid 88 includes an annular flat plate portion 88a, six screw-hole-equipped protrusions 88b protruding from the surface of the flat plate portion 88a, and a cylindrical protrusion 88c protruding from the inner periphery of the flat plate portion 88a. The protrusion 88c protrudes higher than the protrusion 88b. A rubber lid portion 89 is provided on the back surface of the flat plate portion 88a. The lid portion 89 has multiple slits 89a. The open-close lid 88 is screwed into the screw holes 86b of the cylindrical portion 78 with the lid portion 89 sandwiched between the two. When the open-close lid 88 is secured to the cylindrical portion 78, the lower end of the cylindrical portion 78 is usually closed. On the other hand, when the fuse cylinder 8 is inserted into or removed from the high-voltage cutout 100, the slit 89a causes the cover portion 89 to deform as the fuse cylinder 8 passes through the cover portion 89, so that the fuse cylinder 8 can be attached or detached without removing the opening / closing cover 88 from the cylindrical portion 78.

[0038] (Second Example) Referring to Figure 14, high-voltage cutout 100a will be described. High-voltage cutout 100a differs in the structure of upper cutout body 130 from the structure of upper cutout body 30 of high-voltage cutout 100. Therefore, in the following description, only upper cutout body 130 will be described. Furthermore, for upper cutout body 130, parts with substantially the same structure as upper cutout body 30 will be given the same reference numerals as upper cutout body 30, and descriptions thereof may be omitted.

[0039] A metal terminal portion 105 is fixed to the upper end surface 131 of the upper cutout body 130. The terminal portion 105 is fixed to the upper cutout body 130 with a bolt 7 and a nut 9. The terminal portion 105 includes a protective portion 105a that surrounds the upper electric wire 2 and a contact portion 105b that contacts the upper electric wire 2. The protective portion 105a and the contact portion 105b are fixed with a bolt 17. A resin protective cover 103 is provided around the terminal portion 105. The protective cover 103 prevents the terminal portion 105 from getting wet with rainwater. In the case of the high-voltage cutout 100a, the terminal portion 105 is provided outside the upper cutout body 130. Therefore, compared to a configuration in which the upper electric wire 2 is inserted all the way into the upper cutout body (e.g., the high-voltage cutout 100), the work of connecting the upper electric wire 2 to the high-voltage cutout can be made easier.

[0040] (Third Example) Referring to Figure 15, high-pressure cutout 100b will be described. High-pressure cutout 100b has a lower cutout body 170 with a structure that differs from the lower cutout body 70 of high-pressure cutout 100. Therefore, in the following description, only lower cutout body 170 will be described. Furthermore, for lower cutout body 170 with a structure that is substantially the same as that of lower cutout body 70, the same reference numerals as those used for lower cutout body 70 will be used, and descriptions thereof may be omitted.

[0041] In the lower cutout body 170, a lower wiring lead-in portion 180 is provided on the circumferential surface of the cylindrical portion 78. A lower wiring lead-in hole 184 is provided in the lower wiring lead-in portion 180. In the case of the lower cutout body 170, the lower wiring can be introduced into the high-voltage cutout 100b (lower cutout body 170) without using a lower mold cone. Note that in the high-voltage cutout 100b, the upper cutout body 30 may be replaced with the upper cutout body 130.

[0042] (Other variations) In the above embodiment, a high-pressure cutout in which a lower umbrella portion 50 is attached to an upper cutout body 30 has been described. However, a high-pressure cutout does not necessarily have to include a lower umbrella portion 50. For example, the lower umbrella portion 50 can be omitted by increasing the length of the covering portion 36 of the upper cutout body 30 and increasing the creepage distance of the outer surface of the high-pressure cutout. Alternatively, the lower umbrella portion 50 may be omitted and the covering portion 36 of the upper cutout body 30 may be provided with multiple folds. In this case, the creepage distance of the outer surface of the high-pressure cutout 100 can also be long. Note that when multiple folds are provided in the covering portion 36, the folds may be circular and extend outward from the covering portion 36.

[0043] In the above embodiment, the upper end of the lower umbrella portion 50 is fitted into the fixing portion 38 of the upper cutout body 30 to fix the lower umbrella portion 50 to the upper cutout body 30. However, as long as the lower umbrella portion 50 can be fixed to the upper cutout body 30, various fixing methods can be used.

[0044] In the above embodiment, an example has been described in which the open / close lid 88 and the lid portion 89 are attached to the lower portion 86 of the cylindrical portion 78. However, as long as the lower portion 86 of the cylindrical portion 78 can be closed, for example, a sealing plug made of resin may be fitted into the lower portion 86 of the cylindrical portion 78. In that case, the sealing plug and the lower cutout body may be tied together with a string to prevent the sealing plug from falling off.

[0045] In the above embodiment, an example has been described in which the insert portion 74 of the resin lower cutout body 70 is inserted into the covering portion 36 of the resin upper cutout body 3. Furthermore, a porcelain cylinder may be placed between the outside of the insert portion 74 and the inside of the covering portion 36. This improves the strength of the insert portion 74 and the covering portion 36, and improves the durability of the high-pressure cutout.

[0046] In the above embodiment, an example has been described in which the engaging portion 76 of the lower cutout body 70 is fitted into the groove portion 40 of the upper cutout body 30 and the two are fixed together with a thermoplastic adhesive or the like. However, instead of the structure in which the engaging portion 76 of the lower cutout body 70 is fitted into the groove portion 40 of the upper cutout body 30, the two may be fixed together with a screw, pin, or the like. As long as the lower cutout body 70 can be fixed to the upper cutout body 30, the method for fixing the two is not particularly limited, and any fixing method can be used.

[0047] In the first embodiment, the upper mold cone 3 is attached to the upper cutout body 30 using bolts 7, and the lower mold cone 16 is attached to the lower cutout body 70 using bolts 16c. However, the upper mold cone 3 and / or the lower mold cone 16 may be fixed using both bolts and adhesive. This allows the mold cones 3, 16 to be firmly fixed to the cutout bodies 30, 70, and also prevents rainwater from entering the cutout bodies 30, 70.

[0048] In the first embodiment, an example was described in which the arc extinguishing cylinder 6 was placed inside the insertion portion 74. However, it is also possible to use a single insertion portion with an arc extinguishing cylinder formed on the inner surface. This allows the number of parts in the cylindrical cutout to be reduced.

[0049] Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. Furthermore, the technical elements described in this specification or drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technology exemplified in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives itself has technical utility. [Explanation of symbols]

[0050] 4:Top electrode 8: Fuse barrel 12: Lower electrode 30: Upper cutout body 70: Lower cutout body 100: Cylindrical cutout

Claims

1. In a cylindrical cutout connected to a distribution line and high-voltage equipment wiring, an upper cutout body formed of an insulating material and having an upper electrode therein that connects to both the power distribution line and the fuse barrel; a lower cutout body formed of an insulating material and having a lower electrode therein connected to both the high-voltage equipment wiring and the fuse cylinder; It is equipped with the upper cutout body has a cylindrical covering portion that covers a portion of the lower cutout body; the lower cutout body has a cylindrical insertion portion that is inserted into the covering portion; A cylindrical cutout in which the lower cutout body is secured to the upper cutout body, with the upper electrode in contact with the insert.

2. 2. The cylindrical cutout according to claim 1, wherein an insertion hole is provided in the upper surface of the insertion portion, into which a portion of the upper electrode is inserted.

3. the upper electrode has a pair of gripping portions for gripping the fuse barrel; 3. The cylindrical cutout of claim 2, wherein a pair of gripping portions are inserted into the insertion holes.

4. the upper electrode has a connecting portion that connects the pair of gripping portions and has a first through hole provided therein; the upper cutout body has a second through hole communicating with the exterior of the upper cutout body; the lower cutout body has an upper surface portion that closes a portion of the upper end portion of the insertion portion and has a third through hole provided therein; 4. The cylindrical cutout according to claim 3, wherein the upper electrode, the upper cutout body, and the lower cutout body are fixed by fixing members that pass through the first, second, and third through holes and are fixed to the fixed portion of the power distribution cable.

5. 5. A cylindrical cutout according to any one of claims 1 to 4, wherein the upper cutout body and the lower cutout body are secured together by securing a lower end of the covering portion of the upper cutout body to a lower end of the insert portion of the lower cutout body.

6. 6. A cylindrical cutout according to claim 1, wherein the outer periphery of the covering is provided with a shade member for increasing the creepage distance of the outer surface of the cylindrical cutout.

7. 7. The cylindrical cutout according to claim 6, wherein the outer peripheral surface of the covering portion is provided with fastening portions for fastening the umbrella member to the covering portion.

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