CN118263824A - Insulation unit and cable intermediate connection part - Google Patents
Insulation unit and cable intermediate connection part Download PDFInfo
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- CN118263824A CN118263824A CN202311684220.6A CN202311684220A CN118263824A CN 118263824 A CN118263824 A CN 118263824A CN 202311684220 A CN202311684220 A CN 202311684220A CN 118263824 A CN118263824 A CN 118263824A
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- insulating
- cable
- protective cover
- peripheral surface
- outer peripheral
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Abstract
The invention provides an insulation unit and a cable intermediate connection part which can realize high insulation performance with a simple structure. The insulating unit is an insulating unit used in a prefabricated cable intermediate connection portion connecting two power cables, and includes: an internal electrode electrically connected to a cable conductor of the power cable; a reinforcing insulator having an insulating main body portion surrounding the internal electrode and an insulating isolation portion provided continuously with the insulating main body portion in an axial direction of the insulating main body portion, and integrally formed with the internal electrode; a metal protection tube disposed so as to expose the insulating spacer and covering the outer peripheral surface of the insulating body; a shielding part interposed between the insulating body part and the protection pipe; a protective cover made of resin covering the outer peripheral surface of the insulating spacer; and a terminal mounting fitting mounted on the insulating isolation portion and the axial end portion of the protective cover.
Description
Technical Field
The present invention relates to an insulating unit and a cable intermediate connection portion, and more particularly, to an insulating connection portion (IJ: insulation Joint) having an insulating spacer portion (insulating Joint) provided at one end.
Background
Conventionally, as a cable intermediate connection portion for connecting two power cables (for example, a CV cable (cross-linked polyethylene insulated VINYL SHEATH cable), a prefabricated cable intermediate connection portion (also referred to as a prefabricated joint) is known in which cable conductors of two power cables are connected by a conductor connection pipe to form a conductor connection portion, and the conductor connection portion is inserted into an insulation unit.
The insulation unit used in the intermediate connection portion of the prefabricated cable generally has: the cable comprises an inner electrode electrically connected with the cable conductor, a reinforcing insulator surrounding the outer peripheral surface of the inner electrode, a shielding part formed on the outer peripheral surface of the reinforcing insulator, and a protective copper tube arranged on the outer peripheral surface of the shielding part. Further, an insulating spacer member called an insulating tube is disposed at one end portion in the longitudinal direction of the insulating unit via an adapter, and cable shields of two power cables are electrically insulated (for example, see patent document 1).
Prior art literature
Patent literature
Patent document 1: japanese patent No. 5074930
Disclosure of Invention
Problems to be solved by the invention
In recent years, with the increase in voltage of power cables, insulation performance (e.g., insulation resistance such as pulse break voltage) required for cable intermediate connection portions and insulation units has become more stringent.
The invention aims to provide an insulation unit and a cable intermediate connection part which can realize high insulation performance with a simple structure.
Solution to the problem
The insulation unit of the present invention is an insulation unit used in a prefabricated cable intermediate connection portion connecting two power cables,
The insulating unit is provided with:
an internal electrode electrically connected to a cable conductor of the power cable;
A reinforcing insulator having an insulating main body portion surrounding the internal electrode and an insulating partition portion provided continuously with the insulating main body portion in an axial direction of the insulating main body portion, the reinforcing insulator being integrally formed with the internal electrode;
a metal protection tube disposed so as to expose the insulating spacer and covering an outer peripheral surface of the insulating body;
A shielding part interposed between the insulating body part and the protection pipe;
a protective cover made of resin covering the outer peripheral surface of the insulating spacer; and
And a tip mounting fitting mounted on the insulating isolation portion and the end portion of the protective cover in the axial direction.
The cable intermediate connection part of the present invention comprises:
the insulating unit; and
And a cable end portion accommodated in the insulating unit.
Effects of the invention
According to the insulation unit and the cable intermediate connection portion of the present invention, high insulation performance can be achieved with a simple configuration.
Drawings
Fig. 1 is a single-sided cross-sectional view showing a cable intermediate connection portion in the embodiment.
Fig. 2 is a single-sided cross-sectional view showing a cable intermediate connection portion in the embodiment.
Fig. 3 is a partially cutaway perspective sectional view showing the structure of an insulating unit.
Fig. 4 is an exploded perspective view showing the structure of the insulating unit.
Fig. 5 is a diagram showing a connection structure between the shield portion and the protection tube.
Description of the reference numerals
1: A cable intermediate connection portion;
10: an insulation unit;
11: an internal electrode;
12: reinforcing the insulator;
121: an insulating body portion;
122: an insulating spacer;
13: a shielding part;
14: a protective tube;
15: the tail end is provided with a hardware fitting;
16: a protective cover;
17: a support ring (resin ring);
21: a lead-out wire;
22: crimping the terminal;
23: a space;
50 cable end portions;
51A, 51B: a power cable;
511: a cable conductor.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a single-side cross-sectional view showing a cable intermediate connection portion 1 according to an embodiment of the present invention. Fig. 2 is a single-sided cross-sectional view showing the cable intermediate connection portion 1, and shows an insulation isolation structure of the insulation unit 10 in an enlarged manner. In fig. 1 and 2, cross-sectional lines are applied only to the cross-sections of the constituent elements of the insulating unit 10.
Fig. 3 is a partially cut-away perspective sectional view showing the structure of the insulating unit 10. Fig. 4 is an exploded perspective view showing the structure of the insulating unit 10, with individual components shown in partial cutaway perspective section.
As shown in fig. 1 and 2, the cable intermediate connection portion 1 includes an insulating unit 10 and a cable end portion 50. The cable intermediate connection portion 1 is a prefabricated cable intermediate connection portion that connects the two power cables 51A and 51B, and is an insulating connection portion (IJ) having an insulating structure provided at one (right side in fig. 1) end portion in the axial direction.
In the following description, the side of the cable intermediate connection portion 1 on which the insulation structure is provided is referred to as "insulation-provided side", and the opposite side is referred to as "insulation-free side". In the description of the cable end portion 50, the side of each of the power cables 51A and 51B into which the insulation unit 10 is inserted is referred to as "front end side", and the opposite side is referred to as "rear end side". That is, in the cable intermediate connection portion 1, the central side of the cable intermediate connection portion 1 is referred to as "front end side", and both end sides are referred to as "rear end side". However, in the description of the protective tube 14 to be described later, the side of the distal mounting flange 141 is referred to as "rear end side", and the opposite side is referred to as "front end side". In the description of the protective cover 16 described later, since it is attached to the insulating side, the side of the fixing flange 161 is referred to as "rear end side", and the opposite side is referred to as "front end side".
As shown in fig. 1, the cable end portion 50 is configured such that a connection member including a conductor connection pipe 52, a stress cone 53, a compression device 54, and a cable protection fitting 55 is attached to each front end portion of the power cables 51A, 51B.
The power cables 51A, 51B are, for example, ultra-high voltage (for example, 345kV class) power cables insulated with rubber or plastic. The power cables 51A and 51B include, in order from the inside, a cable conductor 511, an inner semiconductive layer (reference numeral omitted), a cable insulator 512, a cable outer semiconductive layer 513, a cable shield layer (reference numeral omitted), a cable sheath (reference numeral omitted), and the like. In the cable end portion 50, the layers are exposed by being separated from the respective distal end portions of the power cables 51A, 51B by a predetermined length.
The cable conductors 511, 511 are connected by a conductor connecting tube 52. The conductor connection pipe 52 is formed of, for example, a conductive material suitable for current conduction, which is made of copper, aluminum, a copper alloy, an aluminum alloy, or the like. The cable conductors 511 and 511 are inserted into the conductor connection pipe 52, and the conductor connection pipe 52 and the cable conductors 511 and 511 are electrically and mechanically connected to each other by compression using a compression jig such as a compression die. The cable conductors 511, 511 are electrically connected to the internal electrode 11 of the insulating unit 10 via a conductor connection pipe 52.
The cable shield layer of the power cable 51A having the insulating isolation side is electrically connected to the end mounting fitting 15 of the insulating unit 10 via the cable protection fitting 55. The cable shield layer of the power cable 51B on the non-insulating isolation side is electrically connected to the protection tube 14 via the cable protection fitting 55.
The stress cone 53 is formed in a spindle shape, and has an insulating portion (reference numeral omitted) on the front end side and a conductive portion (reference numeral omitted) on the rear end side. The insulating portion is formed in a tubular shape from an insulating rubber material such as EP rubber, and the conductive portion is formed in a tubular shape from a semiconductive rubber material such as semiconductive EP rubber. The insulating portion and the conductive portion are integrally formed by compression molding.
The rear end portion (conductive portion) of the stress cone 53 is connected to the cable outer semiconductive layer 513 of the power cables 51A, 51B. On the premise that the cable intermediate connection portion has a predetermined performance, "connected to the cable outer semiconductive layer 513 of the power cables 51A, 51B" means any one of the following cases: a direct connection to the cable outer semiconductive layer 513; the end of the outer semiconductive layer regenerated via a mould or conductive paint is connected to the end of the cable outer semiconductive layer 513. The front end portion (insulating portion) of the stress cone 53 has a shape corresponding to the cable accommodation portion of the insulating unit 10. A compression device 54 and a cable protector 55 are mounted on the rear end side of the stress cone 53.
The compression device 54 has: the pressing pipe 541 abutting against the stress cone 53, the coil spring 542 pushing the pressing pipe 541 toward the stress cone 53, the pressing fitting 543 holding the pressing pipe 541 and the coil spring 542, the shaft 544 fitted to the rear end side of the pressing fitting 543 and inserted into the coil spring 542, the washer 545 fixed by a nut in a state where the rear end side of the shaft 544 is penetrated and holding the coil spring 542 with the front end face and the rear end face of the pressing fitting 543, and the tension bolt 546 penetrating the washer 545 at the rear end side and fixed to the insulating unit 10 side with a bolt at the front end side. The pressing pipe 541 attached to the power cable 51A on the insulating isolation side is provided with an insulating isolation structure, and the axial length thereof is longer than the pressing pipe 541 attached to the power cable 51B on the non-insulating isolation side. The pushing tube 541 may be made of any one of an insulating material and a metal material.
As shown in fig. 1 to 4, the insulating unit 10 includes: the internal electrode 11, the reinforcing insulator 12, the shielding portion 13, the protection tube 14, the end mounting hardware 15, the protection cover 16, and the like. The internal electrode 11 and the reinforcing insulator 12 are integrally formed, for example, by compression molding.
The internal electrode 11 is formed of a conductive material suitable for current conduction, for example, made of copper, aluminum, a copper alloy, an aluminum alloy, or the like. The internal electrode 11 is electrically connected to the cable conductor 511 via a conductor connection pipe 52.
The reinforcing insulator 12 is formed of, for example, a hard plastic resin material (for example, epoxy resin or FRP) having high mechanical strength. The reinforcing insulator 12 has a substantially cylindrical shape, and a cable end accommodating portion 123 is formed by an inner peripheral surface. The internal electrode 11 is disposed at substantially the center of the cable end accommodating portion 123 in the axial direction.
The reinforcing insulator 12 has: an insulating body 121 surrounding the internal electrode 11, and an insulating spacer 122 provided continuously to one end of the insulating body 121 in the axial direction. The insulating spacer 122 has an outer diameter smaller than that of the insulating body 121, and the reinforcing insulator 12 has a two-stage cylindrical shape as a whole. The outer peripheral surface of the insulating body 121 is covered with the protective tube 14, and the outer peripheral surface of the insulating spacer 122 is covered with the protective cover 16.
The length and the outer diameter (thickness) of the insulating spacer 122 in the axial direction are appropriately set according to the required insulating performance and mechanical strength. When the outer diameter of the insulating spacer 122 is increased, the insulating performance and mechanical strength can be improved. On the other hand, when the outer diameter of the insulating spacer 122 is reduced, the insulating performance and mechanical strength are reduced, but the weight of the insulating unit 10 can be reduced.
The shield portion 13 is formed by, for example, applying a conductive paint on the outer peripheral surface of the insulating body portion 121. The shield portion 13 may be formed by further winding a semiconductive tape or a copper mesh tape (shield mesh) on the surface of the coating layer of the conductive paint. The shield portion 13 is disposed on the outer peripheral surface of the insulating body portion 121 of the reinforcing insulator 12, and is not disposed on the outer peripheral surface of the insulating spacer portion 122.
The shielding portion 13 is electrically connected to the protection tube 14 and grounded. For example, one end of the lead wire 21 such as a tin-plated soft copper braid is soldered to the shield portion 13 (for example, a copper mesh tape), the other end is connected to the crimp terminal 22, and the crimp terminal 22 is screwed to the end surface of the protection tube 14, whereby the shield portion 13 and the protection tube 14 are electrically connected (see fig. 5). By providing the shield portion 13, the electric field is not concentrated between the internal electrode 11 and the shield portion 13, and the internal electric field of the insulator 12 is enhanced to be uniform, thereby stabilizing the electric characteristics.
The protection tube 14 is a metal member having a substantially cylindrical shape. The protection tube 14 is formed of a metal material such as copper, brass, or aluminum. The length of the protective tube 14 in the axial direction is substantially the same as the length of the insulating body 121.
The protection tube 14 has a distal end mounting flange 141 formed to protrude radially inward at the end on the rear end side. The cylindrical portion of the protection tube 14 and the end mounting flange 141 may be formed of separate members and integrated by brazing or the like, or may be formed of one member. The opening 141a of the end mounting flange 141 mates with the cable end receiving portion 123 of the reinforcing insulator 12. The protection pipe 14 is disposed so as to cover the outer peripheral surface of the insulating body 121, and the protection pipe 14 is fixed by fixing the end mounting flange 141 to the end surface of the insulating body 121, which is the end surface of the reinforcing insulator 12 on the non-insulating side, for example, by bolts. The protection tube 14 is disposed so as to expose the insulating spacer 122 of the reinforcing insulator 12. The protection tube 14 may be disposed so as to cover a part of the insulating spacer 122.
In the present embodiment, the end portion of the protective tube 14 on the distal end side protrudes from the insulating body portion 121, and covers the stepped portion of the insulating body portion 121 and the insulating spacer 122. A resin support ring 17 is disposed on the stepped portion of the insulating body 121 and the insulating spacer 122. The outer diameter of the support ring 17 is substantially the same as the inner diameter of the protection tube 14. The end portion of the protective tube 14 on the distal end side is fixed to the outer peripheral surface of the support ring 17 by a set screw. The support ring 17 prevents the end portion of the protection tube 14 on the distal end side from loosening, and ensures stability.
The end portion of the protective tube 14 on the distal end side is not directly fixed to the reinforcing insulator 12. That is, the reinforcing insulator 12 can be displaced in the axial direction with respect to the protection tube 14. Thereby, the reinforcing insulator 12 is not bound by the protection tube 14, and can be thermally expanded or contracted in the axial direction.
The support ring 17 has a cutout groove 17a penetrating in the axial direction (thickness direction) on the outer peripheral surface. The lead wire 21 connected to the shielding portion 13 is led out through the slit 17a (see fig. 5). The slit for drawing the lead wire 21 connected to the shielding portion 13 is not limited to a groove shape, and may be a through hole.
The end fitting 15 is a metal member having a flange shape. The end fitting 15 is formed of a metal material such as copper, brass, or aluminum. The opening 15a of the end mounting fitting 15 is matched with the cable end accommodating portion 123 of the reinforcing insulator 12. The outer diameter of the end mounting hardware 15 is larger than the outer diameter of the insulating spacer 122. The end fitting 15 is fixed to the end surface of the reinforcing insulator 12 on the insulating isolation side, that is, the end surface of the insulating isolation portion 122, for example, by bolting. The protective cover 16 is fixed to the end fitting 15 by, for example, bolting.
The protective cover 16 is a resin member having a substantially cylindrical shape. The boot 16 is made of, for example, engineering plastic somalite, nylon doped with glass fibers, or a resin material such as vinyl chloride. The protective cover 16 prevents water or dust from invading into the insulating unit 10.
The end portion of the boot 16 on the rear end side has a fixing flange 161 formed to protrude inward in the radial direction. The opening 161a of the fixing flange 161 matches the outer shape of the insulating spacer 122. The protective cover 16 is disposed so as to cover the outer peripheral surface of the insulating spacer 122, and the protective cover 16 is fixed by fixing the fixing flange 161 to the distal end fitting 15, for example, by bolts. A sealing member 19 such as an O-ring is disposed between the fixing flange 161 and the distal mounting fitting 15.
The inner diameter of the protection cover 16 is substantially the same as the outer diameter of the end portion of the protection pipe 14 on the distal end side, and is larger than the outer diameter of the insulating spacer 122. A space 23 is formed between the protective cover 16 and the insulating spacer 122. In the embodiment, the space 23 is formed by a space surrounded by the outer peripheral surface of the insulating spacer 122, the inner peripheral surface of the protective cover 16, the front end surface of the fixing flange 161, and the rear end surface of the blocking wall 162.
The length of the shield 16 in the axial direction is longer than the length of the insulating spacer 122. The protective cover 16 is disposed so that the end portion on the distal end side of the protective tube 14 is covered with the end portion on the distal end side, for example. A sealing member 18 such as an O-ring is disposed between the protective cover 16 and the protective tube 14.
The end portion on the distal end side of the protection cover 16 is overlapped with the protection pipe 14 only in the radial direction, and the protection pipe 14 and the protection cover 16 are not directly fixed by bolts, screws, or the like. That is, the protection tube 14 is fixed to the reinforcing insulator 12 by the end mounting flange 141, and the protection cover 16 is fixed to the end mounting fitting 15 fixed to the reinforcing insulator 12, but the protection tube 14 and the protection cover 16 are not directly fixed, and the protection tube 14 and the protection cover 16 are abutted with each other to such a tight degree that dimensional fluctuation of the reinforcing insulator 12 can be absorbed. As a result, the reinforcing insulator 12 is not bound to the protection tube 14 or the protection cover 16, and can absorb dimensional fluctuations due to thermal expansion or thermal contraction in the axial direction when the cable intermediate connection portion 1 is used. Further, dimensional deviation (so-called manufacturing tolerance) in the axial direction of the reinforcing insulator 12 after the internal electrode 11 and the reinforcing insulator 12 are integrally molded can be absorbed. In the case where the protective cover 16 is formed of a resin capable of following the deformation of the reinforcing insulator 12, the protective cover 16 may be directly fixed to the reinforcing insulator 12.
Although not shown, the entire outer peripheral surface of the insulating unit 10 is covered with a heat shrinkable tube. The end portion on the distal end side of the protection cover 16 and the end portion on the distal end side of the protection pipe 14 are pressed by the heat shrinkable tube to be closely attached.
The protection cover 16 has a blocking wall 162 formed to protrude radially inward. The opening 162a of the blocking wall 162 matches the outer shape of the insulating spacer 122. The blocking wall 162 is disposed in the vicinity of the end face of the distal end side of the protection tube 14, that is, in the vicinity of the crimp terminal 22 connected to the protection tube 14. The blocking wall 162 suppresses flashover between the crimp terminal 22 and the end fitting 15 (or between the crimp terminal 22 and a bolt that fixes the fixing flange 161 to the end fitting 15). In the case where the length in the axial direction of the insulating spacer 122 for preventing the flashover is sufficiently ensured, the blocking wall 162 may be omitted, but by providing the blocking wall 162, the influence of the metal projections such as the crimp terminal 22, the lead wire 21, and the screw fixing the crimp terminal 22, which are the causes of the flashover, can be minimized, and the length in the axial direction of the insulating spacer 122 does not need to be excessively ensured, so that the length in the axial direction of the insulating unit 10 (and thus the cable intermediate connection portion 1) can be suppressed.
In the assembly process of the cable intermediate connection portion 1, the distal end portions of the power cables 51A and 51B are separated in sections, and then the cable protection fitting 55, the compression device 54, and the stress cone 53 are inserted into the power cables 51A and 51B. The insulating unit 10 is inserted into the power cable 51A having the insulating side (or the power cable 51B having no insulating side). In this state, the conductor connection pipe 52 is attached to the cable conductors 511, 511 of the power cables 51A, 51B.
Next, the insulating unit 10 and the cable end portion 50 are relatively moved in the axial direction, and the internal electrode 11 of the insulating unit 10 is positioned and fixed so as to be electrically connected to the conductor connection pipe 52 of the cable end portion 50. Then, the compression device 54 is fixed in a predetermined state by moving the stress cone 53 toward the insulating unit 10, and then moving the compression device 54 toward the stress cone 53, while compressing the coil spring 542 to press the tip end portion of the stress cone 53 against the inner surface of the insulating body 121.
Further, the cable protection fitting 55 is bolted to the end mounting fitting 15 (with insulating isolation side) or the end mounting flange 141 (without insulating isolation side), and an anti-corrosion layer 56 for waterproofing is formed at the rear end portion of the cable protection fitting 55. In this way, the cable intermediate connection 1 can be assembled in a relatively simple operation.
In the cable intermediate connection portion 1, the cable shield layer of the power cable 51A having the insulating isolation side is electrically connected to the end mounting fitting 15 of the insulating unit 10 via the cable protection fitting 55 and grounded. The cable shield layer of the power cable 51B on the non-insulating isolation side is electrically connected to the protection tube 14 via the cable protection fitting 55 and grounded. Since the end fitting 15 and the protection tube 14 are physically separated by the insulating spacer 122 and the space 23, by adjusting the axial length thereof, high insulation performance can be ensured, and the cable shielding layers of the power cables 51A, 51B can be surely disconnected.
As described above, the insulating unit 10 and the cable intermediate connection portion 1 according to the embodiment have the following features, either alone or in appropriate combination.
That is, the insulating unit 10 is an insulating unit used in the prefabricated cable intermediate connection portion 1 connecting the two power cables 51A, 51B, and the insulating unit 10 includes: an internal electrode 11 electrically connected to the cable conductor 511 of the power cables 51A and 51B; the reinforcing insulator 12 having an insulating body portion 121 surrounding the internal electrode 11 and an insulating partition portion 122 provided continuously with the insulating body portion 121 in the axial direction of the insulating body portion 121 and formed integrally with the internal electrode 11; a metal protection pipe 14 disposed so as to expose the insulating spacer 122 and covering the outer peripheral surface of the insulating body 121; a shielding portion 13 interposed between the insulating body portion 121 and the protection tube 14; a protective cover 16 made of resin covering the outer peripheral surface of the insulating spacer 122; and a distal end mounting fitting 15 mounted on the insulating spacer 122 and the axial end of the protective cover 16.
The cable intermediate connection portion 1 includes an insulating unit 10 and a cable end portion 50 attached to the insulating unit 10.
According to the insulating unit 10 and the cable intermediate connection portion 1, high insulating performance can be achieved with a simple configuration. Specifically, by adjusting the length of the insulating spacer 122 in the axial direction, a desired insulating performance can be easily achieved. In the cable intermediate connection portion 1, the end portion embedded electrode and the insulating tube in the cable intermediate connection portion described in patent document 1 are omitted, and the structure is simplified.
In the insulating unit 10, the outer diameter of the insulating spacer 122 is smaller than the outer diameter of the insulating body 121, and a space 23 is formed between the insulating spacer 122 and the protective cover 16. This can realize the weight reduction of the insulating unit 10 while ensuring high insulating performance.
In the insulating unit 10, the protection tube 14 and the protection cover 16 are fixed to the reinforcing insulator 12, respectively, and the protection tube 14 and the protection cover 16 are abutted to each other with a degree of tightness capable of absorbing dimensional fluctuation of the reinforcing insulator 12. Thereby, the reinforcing insulator 12 is not bound by the protection tube 14 and the protection cover 16, and can thermally expand or contract. That is, even if the reinforcing insulator 12 thermally expands or contracts, no internal stress is generated in the reinforcing insulator 12, and deterioration due to thermal deformation can be suppressed. Further, since the variation in the axial dimension of the reinforcing insulator 12 due to the manufacturing tolerance can be absorbed, the insulating unit 10 (the cable intermediate connection portion 1) can be easily formed.
The insulating unit 10 further includes a support ring 17 (resin ring) disposed on the outer peripheral surface of the insulating spacer 122, and the axial end of the protection pipe 14 is fixed to the outer peripheral surface of the support ring 17. This allows the displacement of the reinforcing insulator 12 relative to the protection tube 14 to be allowed, and prevents the loosening of the end portion of the protection tube 14 on the distal end side, thereby improving stability.
In the insulating unit 10, the support ring 17 (resin ring) has a notch groove 17a (notch) through which the shield portion 13 can be drawn, and the shield portion 13 is drawn out of the notch groove 17a and connected to the end face of the protection tube 14 by the crimp terminal 22. This allows the shield portion 13 to be drawn out and reliably connected to the protection tube 14, and the connection operation can be simplified as compared with the case of the conventional connection by soldering.
In addition, in the insulating unit 10, the protection cap 16 has a blocking wall 162 formed so as to protrude inward in the radial direction and arranged in the vicinity of the end face of the protection tube 14 to which the crimp terminal 22 is connected. This can prevent flashover due to the metal projections such as the crimp terminal 22, the lead wire 21, and the screw fixing the crimp terminal 22, and can ensure high insulation performance.
The present invention completed by the present inventors has been specifically described based on the embodiments, but the present invention is not limited to the embodiments described above, and can be modified within a range not departing from the gist thereof.
For example, in the embodiment, in the reinforcing insulator 12, the outer diameter of the insulating spacer 122 is smaller than the outer diameter of the insulating body 121, but the outer diameters of the insulating spacer 122 and the insulating body 121 may be the same. That is, the space 23 may not be formed between the insulating spacer 122 and the protective cover 16.
In the embodiment, the end portion of the protective tube 14 on the distal end side is fixed to the support ring 17, but the support ring 17 may be omitted, and the protective tube 14 may be pressed against the reinforcing insulator 12 by a heat shrinkable tube provided in the outermost layer.
In the embodiment, the heat shrinkable tube is provided on the outer periphery of the protection tube 14 and the protection cover 16, but a tape winding layer formed by winding an insulating tape or the like may be used instead of the heat shrinkable tube.
For example, as long as insulation performance of the outer peripheral surface of the insulation spacer 122 can be ensured, an insulating object may be placed in the space 23.
The presently disclosed embodiments are considered in all respects to be illustrative and not restrictive. The scope of the invention is indicated not by the above description but by the claims, and also includes meanings equivalent to the claims and all changes within the scope of the claims.
The disclosure of the specification, drawings and abstract of the specification contained in japanese patent application publication No. 2022-211598 of japanese patent application No. 2022, 12, 28 is incorporated herein by reference in its entirety.
Claims (7)
1. An insulation unit used in a prefabricated cable intermediate connection portion for connecting two power cables, the insulation unit comprising:
an internal electrode electrically connected to a cable conductor of the power cable;
A reinforcing insulator having an insulating main body portion surrounding the internal electrode and an insulating partition portion provided continuously with the insulating main body portion in an axial direction of the insulating main body portion, the reinforcing insulator being integrally formed with the internal electrode;
a metal protection tube disposed so as to expose the insulating spacer and covering an outer peripheral surface of the insulating body;
A shielding part interposed between the insulating body part and the protection pipe;
a protective cover made of resin covering the outer peripheral surface of the insulating spacer; and
And a tip mounting fitting mounted on the insulating isolation portion and the end portion of the protective cover in the axial direction.
2. The insulation unit according to claim 1, wherein an outer diameter of the insulation spacer is smaller than an outer diameter of the insulation main body portion,
A space is formed between the insulating spacer and the protective cover.
3. The insulation unit according to claim 1 or 2, wherein the protective tube and the protective cover are fixed to the reinforcing insulator, respectively,
The protective tube and the protective cover abut against each other with a degree of tightness capable of absorbing dimensional fluctuations of the reinforcing insulator.
4. The insulating unit according to claim 3, comprising a resin ring disposed on an outer peripheral surface of the insulating spacer,
An end portion of the protective tube in the axial direction is fixed to an outer peripheral surface of the resin ring.
5. The insulation unit according to claim 4, wherein the resin ring has a slit capable of pulling out the shielding portion,
The shield portion is pulled out from the cutout and connected to an end face of the protection tube by a crimp terminal.
6. The insulating unit according to claim 5, wherein the protective cover has a blocking wall formed so as to protrude inward in a radial direction and arranged in the vicinity of the end face to which the crimp terminal is connected.
7. An intermediate cable connection part, comprising:
the insulation unit of claim 1; and
And a cable end part mounted on the insulation unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022-211598 | 2022-12-28 | ||
| JP2022211598A JP2024094803A (en) | 2022-12-28 | Insulation units and cable joints |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118263824A true CN118263824A (en) | 2024-06-28 |
Family
ID=91609326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311684220.6A Pending CN118263824A (en) | 2022-12-28 | 2023-12-08 | Insulation unit and cable intermediate connection part |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118263824A (en) |
-
2023
- 2023-12-08 CN CN202311684220.6A patent/CN118263824A/en active Pending
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