JP2012029486A - Cable connection part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the securing of a stable surface pressure depending on an area of a rubber block.SOLUTION: A cable connection part includes a rubber block 1 on the outer periphery of a conductor connection part 4. On the outer periphery of the rubber block, a plurality of cylindrical winding tight layers 5a, 5b, 5c, 5d, and 5e formed by overlapping and winding a roll spring tape is provided with micro spaces g along a longer direction.

Description

  The present invention relates to a cable connecting portion, and more particularly to a cable connecting portion including a rubber block on the outer periphery of a conductor connecting portion of a high-voltage CV cable (crosslinked polyethylene cable).

  Conventionally, a rubber block using a so-called one-piece pre-molded rubber block that utilizes the self-shrinking force of rubber from the viewpoint of making the intermediate connection portion of a high-voltage CV cable of 66 kV or higher compact and highly reliable. An insulating intermediate connection is implemented (for example, Patent Documents 1 and 2).

  FIG. 5 shows a longitudinal sectional view of the main part of such a rubber block insulation type intermediate connection part. In this figure, the rubber block insulation type intermediate connection portion is connected to a conductor connection portion 300 of a high voltage CV cable formed by compressing and connecting a pair of cable conductors 100 a and 100 b with a connection sleeve 200, and a pair on the outer periphery of the conductor connection portion 300. And a cylindrical rubber block 500 that is inserted between the outer peripheries of the cable insulators 400a and 400b.

  Here, the rubber block 500 is composed of a cylindrical main insulator 600 made of a silicone rubber material, and a semiconductive silicone rubber material integrally embedded in the inner peripheral surface of the central portion of the main insulator 600. An inner semi-conductor 700, stress cones 800a and 800b made of semi-conductive silicone rubber material embedded and molded in the inner peripheral surfaces of both ends of the main insulator 600, and the outer periphery of the main insulator 600. And an external semi-conductor 800 made of a semi-conductive coating layer or a semi-conductive rubber layer. Note that the inner diameter of the insertion portion of the rubber block 500 is smaller than the outer diameter of the cable insulators 400a and 400b.

  As shown in FIG. 5A, the rubber block 500 having such a configuration is expanded in diameter before functioning as a cable connection portion by using a diameter expansion jig such as a spiral core 900. As shown in FIG. 5 (b), the rubber block 500 whose diameter has been expanded in advance is disposed on the outer periphery of the conductor connection portion 300 across the outer periphery of the pair of cable insulators 400 a and 400 b, and the spiral core 900. Is pulled out from the end portion of the rubber block 500, and as shown by an arrow, the outer periphery of the cable insulators 400a and 400b is appropriately applied to the outer periphery of the cable insulators 400a and 400b by the rubber self-shrinking force. As shown in FIG. 5C, the insulation performance of the rubber block insulation type intermediate connection portion is ensured by contraction and adhesion to the outer periphery of the cable insulators 400a and 400b.

  According to the rubber block 500 having such a configuration, the rubber block 500 is easily contracted and adhered to the outer periphery of the cable insulators 400a and 400b by simply pulling out the spiral core 900 without requiring a special tool at the construction site. Because it can be used, it is excellent in workability.

  However, in order to configure the rubber block insulation type intermediate connection part more simply and inexpensively, the rubber block insulation type intermediate connection part having such a configuration has the following difficulties.

  First, it is necessary to greatly enlarge the diameter of the rubber block 500 by the spiral core 900, and if the rubber block 500 is stored for a long time with the diameter greatly enlarged, the self-tightening force of the rubber block 500 is reduced. To do.

  Secondly, if the rubber block 500 is formed of a material having excellent elongation characteristics in consideration of the aging deterioration of the shrinkage force of the rubber block 500, the material cost and the processing cost are increased as a whole.

  Third, an insertion process of the spiral core 900 is required, and the cost of the material is increased as a whole with the material cost of the spiral core 900.

  On the other hand, as a means to eliminate the gap generated at the interface between the cable insulator and the rubber block and prevent the adhesion of the rubber block to the cable insulator from being reduced, (a) a metal fastening body on the outer periphery of the rubber block There are known ones to be attached (for example, Patent Document 3) and (b) those for mounting a fastening plate on the outer periphery of a rubber block (for example, Patent Document 4).

  However, in the case where (a) the mounting body is mounted, a separate means (tightening band) for tightening the tightening body radially inward is required, and the mounting plate (b) is mounted. However, as in (A), there is a difficulty in that the fastening plate must be separately fastened with a fastening band. In addition, with these fastening bands, the rubber block may fall due to deterioration over time. Then, the tightening force is not transmitted to the rubber, and the tightening body or the tightening plate may be loosened unless the tightening bracket is retightened.

JP 2000-37029 A JP 2008-61416 A JP 2008-271749 A Japanese Patent Laid-Open No. 10-14080

  The present invention has been made to solve the above-mentioned problems, and can secure a stable surface pressure according to the part of the rubber block and can complement the contraction force of the rubber block due to aging. An object of the present invention is to provide a cable connecting portion that enables a rubber block to be slid and inserted by enabling a design with a reduced diameter difference between the rubber blocks.

  The cable connection part which is the 1st aspect of this invention is a cable connection part provided with a rubber block in the outer periphery of a conductor connection part, and the outer periphery of a rubber block is a some cylindrical shape formed by the lap | wrapping of a roll spring tape. The winding layer is provided with a minute gap along the longitudinal direction.

  According to a second aspect of the present invention, in the cable connection portion according to the first aspect, the roll spring tape has an inner diameter that is greater than an outer diameter of the rubber block before being wound around the outer periphery of the rubber block. Is also rolled up in a cylindrical shape so as to be smaller.

  According to a third aspect of the present invention, in the cable connection portion according to the first aspect or the second aspect, the gap exists at a position shifted from a position corresponding to a position where the electric field strength of the rubber block is high. .

  4th aspect of this invention respond | corresponds with the position where the electric field strength of a rubber block is high among several cylindrical winding layers in the cable connection part which is the aspect of any one of 1st aspect thru | or 3rd aspect. The tightening force of the cylindrical winding layer provided at the place to be applied is greater than the tightening force of the cylindrical winding layer provided at the position corresponding to the position where the electric field strength of the rubber block is low.

  According to a fifth aspect of the present invention, in the cable connection portion according to any one of the first to fourth aspects, the rubber block includes stress cones at both ends, and the plurality of cylindrical winding layers include: The winding force of the cylindrical winding layer provided at a location corresponding to the rising portion of the stress cone is larger than the winding force of the cylindrical winding layer provided at another location.

  According to a sixth aspect of the present invention, in the cable connecting portion according to any one of the first to fifth aspects, the width of the roll spring tape is approximately the same as the width of the operator's hand. Is.

  According to the cable connection portion of the first to sixth aspects of the present invention, the following effects are obtained.

  First, by providing a plurality of cylindrical winding layers formed by lap winding of a roll spring tape on the outer periphery of the rubber block, that is, a plurality of cylindrical windings segmented over the entire length of the outer periphery of the rubber block. By providing the fastening layer, a stable surface pressure can be ensured according to the part of the rubber block.

  Secondly, by applying a tightening force from the outer periphery of the rubber block toward the inside in the radial direction, the shrinkage force of the rubber block due to aging deterioration is complemented, and as a result, it is possible to cope with aging deterioration of the surface pressure. be able to.

  Thirdly, by complementing the surface pressure of the rubber block with a plurality of cylindrical winding layers, the tightening force of the rubber block can be reduced, and the difference in diameter of the rubber block with respect to the outer diameter of the cable insulator can be reduced. The design can be made smaller, and it is possible to slide the rubber block even when the spiral core is not installed, that is, the diameter of the rubber block is not expanded. The cost can be reduced as a whole.

  Fourth, since a plurality of cylindrical winding layers can be easily formed by wrapping a roll spring tape on the outer periphery of the rubber block, a jig dedicated to the formation of the plurality of cylindrical winding layers, etc. Is not necessary, and no special skill is required to form a plurality of cylindrical winding layers.

  Fifth, since the plurality of cylindrical winding layers are segmented, a cylindrical winding layer having a large tightening force is provided at a portion where a relatively large surface pressure is required (such as a rising portion of a stress cone). The surface pressure can be controlled by disposing a cylindrical winding layer having a small tightening force at other portions.

  Sixth, since there is no need to store the expanded diameter using a spiral core as in the prior art, there is no risk of aging deterioration of the rubber due to the expanded diameter, and there is no worry of aging deterioration of the shrinkage force even in use. That is, since a plurality of cylindrical winding layers always apply a tightening force toward the radially inward direction, even when the rubber is sunk, there is no need to retighten.

The longitudinal cross-sectional view of the rubber block in this invention. FIG. 2 is an explanatory diagram of an intermediate connection portion of a high-voltage CV cable using the rubber block shown in FIG. 1, where a part (a) is a longitudinal sectional view of the intermediate connection part of the high-voltage CV cable, and a part (b) is an intermediate part of the high-pressure CV cable. The partial cross section figure of a connection part. It is explanatory drawing of the roll spring tape in this invention, A division figure (a) is a front view of a roll spring tape, and a division figure (b) is a side view of a roll spring tape. The perspective view which shows the state which has rolled the roll spring tape in this invention around the outer periphery of a rubber block. It is explanatory drawing of the intermediate | middle connection part of the conventional high voltage | pressure CV cable, a part figure (a) is a longitudinal cross-sectional view which shows the state by which the rubber block is expanded, and part figure (b) has pulled out the spiral core from the rubber block. The longitudinal cross-sectional view which shows a state, and fractional drawing (c) are the longitudinal cross-sectional views which show the state with which the rubber block was mounted | worn on the outer periphery of the cable insulator.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments to which a cable connecting portion of the invention is applied will be described with reference to the drawings.
[Example 1]
FIG. 1 is a longitudinal sectional view of a rubber block suitable for an intermediate connection portion of a 66 kV high-voltage CV cable.

  In the figure, a rubber block 1 according to the present invention includes a cylindrical insulating cylinder 11 and a cylindrical inner semiconductive layer 12 embedded and molded integrally with the insulating cylinder 11 in the inner periphery of the central portion of the insulating cylinder 11. A trumpet-shaped first stress cone 13a that is integrally embedded and molded on one end side of the insulating cylinder 11 concentrically with the insulating cylinder 11, and opposed to the first stress cone 13a on the other end side of the insulating cylinder 11. A trumpet-shaped second stress cone 13b which is integrally embedded and molded concentrically with the insulating cylinder 11, and a cylindrical outer half integrally molded with the insulating cylinder 11 on the outer periphery of the central portion of the insulating cylinder 11. And a conductive layer 14.

  The insulating cylinder 11 is made of an elastic material such as a silicone rubber material. The inner semiconductive layer 12 and the outer semiconductive layer 14 are each formed of a semiconductive elastic material, for example, a semiconductive silicone rubber material, and the inner peripheral surface of the inner semiconductive layer 12 is the inner periphery of the insulating cylinder 11. The outer circumferential surface of the outer semiconductive layer 14 is formed to be flush with the outer circumferential surface of the insulating cylinder 11. The first and second stress cones 13a and 13b are each formed of a semiconductive elastic material, for example, a semiconductive silicone rubber material. The small diameter portions of the first and second stress cones 13a and 13b, respectively. The inner peripheral surface on the side is formed so as to be flush with the inner peripheral surface of the insulating cylinder 11. Further, the inner peripheral surfaces of the first and second stress cones 13a and 13b each have an arc-shaped inner peripheral surface that smoothly expands from the end side of the insulating tube 11 toward the outer peripheral side of the central portion. Portions 130a and 130b are provided, and the large-diameter side portions 131a and 131b of the first and second stress cones 13a and 13b are arranged so as to face each other with the inner semiconductive layer 12 interposed therebetween in the insulating cylinder 11, The end portions of the first and second stress cones 13 a and 13 b on the insulating cylinder 11, that is, the small diameter sides 132 a and 132 b of the first and second stress cones 13 a and 13 b are the inner peripheral portions of the end portions of the insulating cylinder 11. Is formed so as to extend outward in the axial direction.

  The rubber block 1 thus obtained has a diameter difference of about 1.5 to 2.0 mm with respect to the outer diameters of cable insulators 22a and 22b, which will be described later, as mounted portions.

  In this embodiment, the external semiconductive layer 14 is formed on the second stress cone 13b from a position excluding the outer periphery of one end portion of the rubber block 1, that is, from a position near the large diameter portion 131a of the first stress cone 13a. It is a so-called one-end cutting structure provided across the position that contacts the outer periphery of the rubber block, but is provided on the outer periphery of the rubber block so as to contact the first and second stress cones 13a, 13b at both ends over the entire length. In other words, a so-called non-edge-cutting structure may be used, and a so-called edge-cutting structure may be provided so as to extend from a position near the large-diameter portion side 131a of the first stress cone 13a to a position near the large-diameter portion side 131b of the second stress cone 13b. A double-edged structure may be used. Further, the external semiconductive layer 14 may be formed of a semiconductive paint coating layer instead of the semiconductive silicone rubber material. That is, the structure of the external semiconductive layer 14 is not limited.

  FIG. 2 is a partial cross-sectional view of an intermediate connection portion of a 66 kV high-voltage CV cable using a rubber block according to the present invention. In the figure, parts common to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 2, the intermediate connection portion of the 66 kV high voltage CV cable is formed as follows.

  First, a pair of high-voltage CV cables 2a and 2b to be connected are respectively cable conductors 21a and 21b, cable internal semiconductors (not shown), cable insulators 22a, which are sequentially provided on the outer periphery of the cable conductors 21a and 21b, 22b, cable external semiconductors 23a and 23b, a cable shielding layer (not shown), and a cable sheath (not shown).

  Next, a pair of high-voltage CV cables 2a and 2b to be connected are stepped to remove a cable shielding layer (not shown), cable external semiconductors 23a and 23b, cable insulators 22a and 22b, and cable conductors 21a, 21b is exposed.

  And the conductor connection part 4 of a high voltage | pressure CV cable is obtained by compression-connecting the exposed cable conductors 21a and 21b with the connection sleeve 3. FIG. Note that the outer periphery of the connection sleeve 3 is semiconductive or conductive for filling a gap between the inner semiconductive layer 12 and the connection sleeve 3, that is, for electrically contacting the inner semiconductive layer 12 and the connection sleeve 3. A spacer (not shown) is provided.

  Thus, the rubber block 1 that has been inserted into one of the CV cables in advance is slid to a normal position, that is, to a position where the central portion of the rubber block 1 corresponds to the central portion of the conductor connecting portion 4. As a result, the inner diameter of the rubber block 1 is reduced by the self-compression force, the inner periphery of the inner semiconductive layer 12 is in electrical contact with the conductor connecting portion 4 via the spacer (not shown), and the inner diameter of the insulating cylinder 11 is increased. The circumference contacts the outer circumference of the cable insulators 22a and 22b, and the inner circumference of the small diameter side 132a and 132b of the first and second stress cones 13a and 13b contacts the cable external semiconductors 23a and 23b. Become. The cable outer semiconductors 23a and 23b at the end of the cable when the rubber block is attached may be obtained by regenerating a predetermined portion once regenerated with a semiconductive material.

  Thus, for example, first to fifth cylindrical winding layers 5a, 5b, 5c, 5d, and 5e are arranged in the longitudinal direction of the rubber block 1 on the outer periphery of the rubber block 1 attached to the outer periphery of the conductor connection portion 4. It is provided along. In this case, the cylindrical winding layers 5 a, 5 b, 5 c, 5 d, which are segmented over the entire length of the rubber block 1 as a whole by providing a minute gap of about 5 mm between adjacent cylindrical winding layers, for example. 5e will be provided.

  The first to fifth cylindrical winding layers 5a, 5b, 5c, 5d, and 5e are each formed by, for example, lap winding of a roll spring tape 6 shown in FIG.

  In the figure, the roll spring tape 6 is made of a stainless steel tape having a thickness of about 0.4 mm and a width of about 90 mm, for example. It is wound in a coil shape so that its own inner diameter is smaller than the outer diameter of the rubber block 1. In this embodiment, the coil is wound so that the number of turns is, for example, 9 turns, and the inner diameter Φ of the coil is about 75% to 90% of the outer diameter of the rubber block 1. In the figure, reference numeral 6 a denotes a chamfered portion at the end portion of the roll spring tape 6.

  For example, as shown in FIG. 4, the roll spring tape 6 wound in a coil shape is rolled on the outer periphery of the rubber block 1 while holding the roll spring tape 6 with one hand (for example, 9 The first to fifth cylindrical winding layers 5a, 5b, 5c, 5d, and 5e are formed by turning.

  Here, as the roll spring tape 6, it is preferable to use a roll having the same width as the operator's hand. In this embodiment, by setting the width of the roll spring tape 6 to, for example, about 90 mm, the operator can easily wrap the roll spring tape 6 on the outer periphery of the rubber block 1 while holding the roll spring tape 6 with one hand. If the width of the roll spring tape 6 is made larger than this, it becomes difficult for one person to work, and the roll spring tape 6 must be wound up by two persons, which may deteriorate the workability. On the other hand, if the width of the roll spring tape 6 is made smaller than this, the number of parts to which the roll spring tape 6 is tightened increases, and the number of parts increases. As a result, there is an inconvenience that the surface pressure cannot be applied according to the electric field strength. That is, for example, there is such a disadvantage when the inner diameter of a small roll spring that has been applied to a conventional cable shielding layer is increased and applied to the outer periphery of a rubber block.

  Next, when the first to fifth cylindrical winding layers 5a, 5b, 5c, 5d, and 5e are provided on the outer periphery of the rubber block 1, the gap g generated between the adjacent cylindrical winding layers is the rubber block 1. It is necessary to be present at a position shifted from a position corresponding to a position where the electric field strength of is high. If the gap g is present at a location corresponding to a position where the electric field strength of the rubber block 1 is high, the tightening force toward the radially inward of the rubber block 1 at the location corresponding to the gap g is reduced, resulting in rubber This is because the surface pressure cannot be applied intensively to the portion of the block 1 where the electric field strength is high, and as a result, the partial discharge performance may be deteriorated. In this embodiment, the electric field strength of the rubber block 1 is such that the rising portions 133a and 133b of the first and second stress cones 13a and 13b are high, and the gap g is located at a position where the electric field strength of the rubber block 1 is high. That is, the first and second stress cones 13a and 13b are located at positions shifted from the first and second vertical surfaces L1a and L1b through the rising portions 133a and 133b. Further, both side end portions 12a and 12b (hereinafter, the left inner peripheral end portion 12a in the figure is referred to as "first inner peripheral end portion 12a" in the figure), If the vicinity of the inner peripheral end portion 12b is referred to as “second inner peripheral end portion 12b”), if the vicinity is not in close contact with the cable insulators 22a and 22b, a gap is generated in the portion, and the insulating cylinder 11 and the inner semiconductive layer 12 are formed. Where there is a possibility that the electric field concentrates on the triple junction where the air gaps and the electric field strength is high, the gap g is located at the position where the electric field strength of the rubber block 1 is high, that is, the first and second of the internal semiconductive layer 12. Are located at positions shifted from the third and fourth vertical surfaces L2a and L2b passing through the inner peripheral end portions 12a and 12b.

  As a result, the substantially central portion of the first cylindrical winding layer 5a corresponds to the first inner peripheral end portion 12a of the internal semiconductive layer 12 at a location corresponding to the rising portion 133a of the first stress cone 13a. A substantially central portion of the second cylindrical winding layer 5b is located at a location, and a substantially central portion of the fourth cylindrical winding layer 5d is located at a location corresponding to the second inner peripheral end portion 12b of the internal semiconductive layer 12. The substantially central portion of the fifth cylindrical winding layer 5b is disposed at a position corresponding to the rising portion 133b of the second stress cone 13b, and consequently, in the radial direction of the corresponding cylindrical winding layer. The surface pressure can be intensively applied to the portion where the electric field strength of the rubber block 1 is high by the tightening force toward the direction.

  Next, in this embodiment, the tightening force of the cylindrical winding layer provided at a position corresponding to the position where the electric field strength of the rubber block 1 is high among the plurality of cylindrical winding layers is the rubber block 1. Is set to be larger than the winding force of the cylindrical winding layer provided at a position corresponding to the position where the electric field strength is low. Thereby, surface pressure can be controlled. Specifically, the first and fifth cylindrical winding layers 5a and 5e and the inner semiconductive layer 12 provided at locations corresponding to the rising portions 133a and 133b of the first and second stress cones 13a and 13b. The tightening force of the second and fourth cylindrical winding layers 5b and 5d provided at locations corresponding to the first and second inner peripheral end portions 12a and 12b is a position where the electric field strength of the rubber block 1 is low ( It is set to be larger than the winding force of the third cylindrical winding layer 5c provided at a location corresponding to the central portion of the inner semiconductive layer 12). Note that the winding force of the first to fifth cylindrical winding layers 5a, 5b, 5c, 5d, and 5e depends on the material of the roll spring tape 6, the increase or decrease in the number of turns of the roll spring tape 6, or the roll spring tape 6 The winding force of the cylindrical winding layers 5a, 5b, 5c, 5d, and 5e can be adjusted by adjusting the thickness of the plate. Note that the winding force of the second and fourth cylindrical winding layers 5b and 5d provided at locations corresponding to the first and second inner peripheral ends 12a and 12b of the inner semiconductive layer 12 is a rubber block. 1 and the cable insulators 22a and 22b may be tightened to such an extent that no gap remains at the interface, while the first and second stress cones 13a and 13b are provided at locations corresponding to the rising portions 133a and 133b. The winding force of the first and fifth cylindrical winding layers 5a and 5e is such that the rising portions 133a and 133b of the stress cones 13a and 13b are the places where the electric field strength is the highest among the cable connection portions of the present embodiment. Therefore, it needs to be big. Therefore, the winding force of the first and fifth cylindrical winding layers 5a and 5e provided at the locations corresponding to the rising portions 133a and 133b of the first and second stress cones 13a and 13b is the internal semiconductive layer. It is more preferable that it is larger than the tightening force of the second and fourth cylindrical tightening layers 5b and 5d provided at locations corresponding to the first and second inner peripheral end portions 12a and 12b.

  According to the cable connecting portion having such a configuration, the following effects are obtained.

  First, by providing the first to fifth cylindrical winding layers 5a, 5b, 5c, 5d, and 5e formed by lap winding of the roll spring tape 6 on the outer periphery of the rubber block 1, that is, the rubber block 1 By providing the cylindrical winding layers 5 a, 5 b, 5 c, 5 d, and 5 e that are segmented over the entire length on the outer circumference of the rubber block, a stable surface pressure can be ensured according to the part of the rubber block 1.

  Secondly, by applying a tightening force from the outer periphery of the rubber block 1 toward the radially inward direction, the shrinkage force of the rubber block 1 due to aging deterioration is complemented, and as a result, the surface pressure also deteriorates over time. Can be matched.

  Thirdly, the clamping force of the rubber block 1 can be reduced by supplementing the surface pressure of the rubber block 1 with the first to fifth cylindrical winding layers 5a, 5b, 5c, 5d, and 5e. As a result, the rubber block 1 can be designed so that the difference in diameter of the rubber block 1 with respect to the outer diameter of the cable insulator is reduced, and the rubber block 1 can be inserted even when the spiral core is not attached, that is, when the rubber block is not expanded. By becoming possible, it is possible to eliminate the need for a diameter expansion holding member such as a spiral core, and it is possible to reduce the cost as a whole.

  Fourth, the first to fifth cylindrical winding layers 5a, 5b, 5c, 5d, and 5e can be easily formed by wrapping the roll spring tape 6 on the outer periphery of the rubber block 1. A dedicated jig or the like is not required for forming the first to fifth cylindrical winding layers 5a, 5b, 5c, 5d, 5e, and the first to fifth cylindrical winding layers 5a, 5b, 5c, No special skills are required to form 5d and 5e.

  Fifth, since the first to fifth cylindrical winding layers 5a, 5b, 5c, 5d, and 5e are segmented, a portion that requires a relatively large surface pressure (such as a rising portion of a stress cone). Is provided with cylindrical winding layers 5a, 5b, 5d, and 5e having a large tightening force, and a cylindrical winding layer 5c having a small tightening force is disposed at other portions, thereby reducing the surface pressure. Control can be achieved.

  Sixth, since there is no need to store the expanded diameter using a spiral core as in the prior art, there is no risk of aging deterioration of the rubber due to the expanded diameter, and there is no worry of aging deterioration of the shrinkage force even in use. In other words, the first to fifth cylindrical winding layers 5a, 5b, 5c, 5d, and 5e always apply a tightening force toward the radially inward direction. There is no need to fix it.

  Seventh, since the connecting portion of the high-pressure CV cable can be assembled with a self-compression slide type, a diameter expansion holding member such as the spiral core 900 is unnecessary, and the spiral core is inserted into the rubber block as before. The process and material costs can be omitted, and the overall cost is reduced.

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

  First, in the above-described embodiment, the first to fifth cylindrical winding layers 5a, 5b, 5c, 5d, and 5e are formed by the stainless steel roll spring tape 6. For example, phosphor bronze is used. The cylindrical winding layers 5 a, 5 b, 5 c, 5 d, 5 e may be formed with the roll spring tape 6.

  Secondly, in the above-described embodiment, the first to fifth cylindrical winding layers 5a, 5b, 5c, 5d, and 5e are provided on the outer periphery of the rubber block 1. The number formed may be more or less. However, in the intermediate connection portion of the high-voltage CV cable, there are four positions where the electric field strength of the rubber block is high and where there is a risk of increasing (two stress cone rising portions and two inner peripheral end portions of the internal semiconductive layer). Since it exists, it is necessary to provide at least four cylindrical winding layers.

  Thirdly, in the above-described embodiment, the case where the insulating cylinder 11, the inner semiconductive layer 12, the stress cones 13a and 13b, and the outer semiconductive layer 14 are formed of silicone rubber has been described. (EP rubber) may be used.

  Fourthly, in the above-described embodiment, the case where the rubber block is applied to the intermediate connection portion of the high-voltage CV cable is described. However, the connection portion between the device-side bushing and the power cable, the connection portion of the inter-panel bus, etc. You may apply to. In this case, these are regarded as the cable connection portions of the present invention, and the portion of the insulator formed of epoxy resin on the outer periphery of the conductor, which is inserted into the rubber block at the device-side bushing or inter-panel bus, is the cable insulation of this embodiment. Consider body.

  Fifth, in the above-described embodiment, the rated voltage is 66 kV class, but the rated voltage may be lower or higher.

DESCRIPTION OF SYMBOLS 1 ... Rubber block 4 ... Conductor connection part 5a-5e ... 1st-5th cylindrical winding layer 6 ... Roll spring tape g ... Gap

Claims (6)

In the cable connection part provided with a rubber block on the outer periphery of the conductor connection part,
A cable connecting portion characterized in that a plurality of cylindrical winding layers formed by lap winding of a roll spring tape are provided on the outer periphery of the rubber block with a minute gap along the longitudinal direction.   The roll spring tape is wound in a cylindrical shape so that the inner diameter of the roll spring tape is smaller than the outer diameter of the rubber block in a state before being rolled over the outer periphery of the rubber block. The cable connecting portion according to claim 1.   3. The cable connecting portion according to claim 1, wherein the gap exists at a position shifted from a position corresponding to a position where the electric field strength of the rubber block is high.   Of the plurality of cylindrical winding layers, the winding force of the cylindrical winding layer provided at a position corresponding to a position where the electric field strength of the rubber block is high corresponds to a position where the electric field strength of the rubber block is low. The cable connecting portion according to any one of claims 1 to 3, wherein the cable connecting portion is larger than a winding force of the cylindrical winding layer provided at a place to be operated.   The rubber block is provided with stress cones at both ends, and the winding force of the cylindrical winding layer provided at a location corresponding to the rising portion of the stress cone is the other location among the plurality of cylindrical winding layers. The cable connecting portion according to any one of claims 1 to 4, wherein the cable connecting portion is larger than a winding force of the cylindrical winding layer provided on the cable.   The cable connecting portion according to any one of claims 1 to 5, wherein a width of the roll spring tape is substantially equal to a width of an operator's hand.

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