JP4762700B2 - Power cable termination connection device - Google Patents

Description

  The present invention relates to a power cable termination connection device used for termination, connection, etc. of a power cable, and particularly to a power cable termination connection device intended for a high voltage power cable of several tens of kV or more.

  2. Description of the Related Art Conventionally, for example, a power cable termination connecting device used for terminating and connecting a high-voltage power cable of several tens of kV or more is a gutter tube that holds a power cable and insulating oil inside, a frame, and the power cable and gutter tube A support metal fitting attached to the power cable, a cable protection member that relieves stress applied to the power cable, and an oil stopper metal that prevents leakage of insulating oil in the vertical pipe and a drawer bar fixing flange.

  FIG. 8 is a conceptual diagram showing an example of a conventional power cable termination connecting device for laying a power cable perpendicular to the ground. In FIG. 8, the cable protection member 215 and the tub tube 11 are attached to the gantry 13 using the support fitting 12 so that the power cable 1 is substantially perpendicular to the ground 301. Conventionally, the cable protection member 215 of the power cable terminal connection device 201 is provided in a direction opposite to the soot tube 11 with respect to the support fitting 12, as typically shown in FIG. Here, the power cable 1 is pulled out so as to be substantially parallel to the ground 301 as it is separated from the cable protection member 215.

Japanese Utility Model Publication No. 6-74036

  However, in the conventional power cable termination connecting device 201, the cable protection member 215 protrudes greatly from the support fitting 12, and the bending applied to the power cable 1 drawn from the cable protection member 215 needs to be suppressed within an allowable range. As a result, there is a problem that the power cable 1 has to be greatly extended to the bottom of the gantry as shown in FIG. As a result, particularly when a high voltage of several tens of kV or more is targeted, the power cable 1 is drawn out under the gantry and an underground cavern 302 or the like for securing the bending radius of the power cable 1 is required. The laying work of the terminal connection device 201 has become large-scale. As the device scale increases, the height of the underground cavern 302 needs to be increased accordingly, and the installation work of the power cable terminal connecting device 201 has become larger.

  An object of the present invention is to provide a power cable terminal connecting device that can reduce the amount of projection of a cable protection member from a support metal fitting and thereby reduce the scale of laying work.

The first aspect according to the present invention is to hold the power cable (1) and the insulating cable (2) in the inner pipe (11) and the power cable (1) of the two end faces of the lower pipe (11). Power cable terminal connection having a portion in contact with the cable holding end surface, and an insulating oil retaining member (14) in the insulating tube that holds the insulating oil (2) integrally with the insulating tube (11) and the power cable (1) In the apparatus, the insulating oil retaining member (14) in the soot tube extends along the soot tube (11) from the flange portion (14b ₂ ) in contact with the cable holding end surface of the soot tube (11) and the flange portion (14b ₂ ). the tubular portion (14b ₁₎ and the oil-stop adapter (14b) having a cylindrical portion with being arranged in (14b ₁₎ in the oil-stop adapter (14b), a pipe section enclosing the power cable (1) (14a ₁ ), An attachment portion (14a ₂ ) formed on the outer periphery of the pipe portion (14a ₁ ) and facing the inner surface of the cylindrical portion (14b ₁ ) of the oil stopper adapter (14b) via the O-ring (24c); It consists of an oil retaining member (14a) attached to the power cable (1) in a state where the oil retaining treatment is performed, and an O-ring (24c) at the upper end of the cylindrical portion (14b ₁ ) of the oil retaining adapter (14b ). and oppose a threaded portion provided on the outer peripheral surface of the surface opposite to that pulls in turn the tubular clamping fitting with the inner peripheral surface a threaded portion screwed to the threaded portion of the cylindrical portion (14b1) (24a), The power cable terminal connecting device is characterized in that the oil stopper adapter (14b) and the oil stopper member (14a) are oil-sealed, and the oil stopper member (14a) is fixed to the oil stopper adapter (14b) .

The 2nd aspect which concerns on this invention is a power cable termination | terminus connection apparatus with which the oil stop member (14a) is attached to the power cable (1) by the attachment member different from a stress cone (22a) .

The 3rd aspect which concerns on this invention is a power cable termination | terminus connection apparatus which has attached the shrinkable tube or the tape to the power cable (1) so that the oil stop member (14a) may be applied .

According to a fourth aspect of the present invention, there is further provided a power cable terminal connecting device, wherein the cylindrical fastening fitting (24a) is fixed to an oil stop member (14a).
The fifth aspect according to the present invention further includes a protective flange portion fixed to the lower surface of the flange portion (14b ₂ ), and a tubular portion extending downward from the protective flange portion along the power cable (1). The lower end surface of the tubular portion of the cable protection member (15) is within the range of 0 mm to 50 mm vertically downward from the cable holding end surface of the soot tube (11). It is a power cable termination connection device .
According to a sixth aspect of the present invention, the flange portion (14b ₂ ) is in contact with the cable holding end surface of the soot tube (11) on its upper surface, and is attached to the gantry (13) via the support insulator (21d). In a state where the ring-shaped groove formed on the upper surface of the support metal fitting (12) is fitted, the support metal 12) A power cable terminal connecting device fixed so as to be pressed to the side.

  According to the present invention, since the insulation oil holding member in the vertical pipe is provided in the vertical pipe so as to ensure insulation, the power cable terminal connecting device capable of reducing the scale of the laying work can be realized.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 3 show an embodiment of the present invention.
FIG. 1 is a schematic diagram showing a cross-sectional structure of the left half side of the central axis of the power cable 1 of the power cable terminal connecting device of the present invention. The power cable 1 is provided with an anticorrosion layer 1d, a semiconductive layer 1c, an insulator portion 1b, and a conductor 1a exposed at one end, and these are housed and provided in a soot tube 11. In FIG. 1, a power cable terminal connecting device 101 includes a tub tube 11 that accommodates and holds the power cable 1 and the insulating oil 2 therein, a gantry 13, and a tub tube 11 provided between the tub tube 11 and the power cable 1. An insulating oil retaining member 14 in the soot tube that is integrated with the power cable 1 and holds the insulating oil 2, a cable protection member 15 that is disposed on one end side of the soot tube 11 and into which the power cable 1 drawn from the soot tube is inserted, A support fitting 12 attached to one end of the soot tube 11 to support the soot tube 11 and attached to the gantry 13 via a support insulator 21d, and a conductor for ensuring an electrical connection between the power cable 11 and an external device A lead bar 16 and a fixing flange 17 for fixing the conductor lead bar 16 to the other end of the soot tube 11 are provided.

In the present embodiment, the in-pipe insulating oil retaining member 14 includes an oil retaining member 14a attached to the power cable 1 and an oil retaining adapter for attaching the oil retaining member 14a to the support fitting 12, as shown in an enlarged view in FIG. 14b. Oil-stop member 14a includes an oil-stop pipe portion 14a ₁ which encloses a power cable 1, and a mounting portion 14a ₂ which is mounted a formed on the outer periphery of the oil-stop pipe 14a ₁ oil-stop adapter 14b. The oil stopper adapter 14b includes a cylindrical portion 14b ₁ that contains the oil stopper member 14a, and a flange portion that is in contact with the end surface of the soot tube 11 on one end side of the cylindrical portion 14b ₁ . The other end portion of the cylindrical portion 14b ₁ is provided in a shape in which the outer surface of the mounting portion 14a ₂ is in contact with the inner peripheral surface, and a screw portion that is screwed into the fastening bracket 24a is provided on the outer peripheral surface. ing. Hereinafter referred flange portion contacting the end face of the porcelain bushing 11 of Aburatome adapter 14b and the adapter flange portion 14b _2, the end face of the adapter flange portion 14b ₂ and the contact hollow insulator 11 that cable retention end face. The adapter flange portion 14b ₂ is attached to the support fitting 12.

  The oil stop member 14a and the oil stop adapter 14b are attached by a clamp 24a, and a sealing property is secured through an O-ring 24c. The clamp 24a is formed in a cylindrical shape, and an inner peripheral surface is provided with a screw portion that is screwed with a screw portion of the oil stopper adapter 14b. The oil stopper adapter 14b is formed on the outer periphery as shown in FIG. The formed screw meshes with the screw formed on the inner surface of the tubular fastening fitting 24a, and the oil stopper adapter 14b is fastened to the O-ring 24c side by turning the fastening fitting 24a. The fastening bracket 24a is fixed to the mounting portion of the oil stop member 14a by a screw 24b.

  A stress cone 22a for relaxing the electric field is provided on the insulator portion 1b of the power cable 1 on the upper end side of the insulating oil retaining member 14 in the soot tube. The stress cone 22a, the insulating oil retaining member 14 in the soot tube and the half between them are provided. The conductive layer 1c is subjected to an oil stop treatment. The stress cone 22a is made of rubber or the like, for example. Further, as the oil stop treatment, for example, as shown in FIG. 2, a shrinkable tube, tape or the like having insulating properties and waterproof properties is used as the outer periphery of the stress cone 22a, the insulating oil retaining member 14 in the tub tube, and the semiconductive layer 1c therebetween. Provided. In the above description, the structure in which the insulating oil retaining member 14 in the pipe tube is composed of two members, the oil stopper member 14a and the oil stopper adapter 14b, has been described from the viewpoint of ease of assembly. It is not excluded that the member 14 is integrally formed.

  The cable protection member 15 has a protective flange portion for connecting to the adapter flange portion of the oil stopper adapter 14b, and a tubular portion. Inside the tubular portion of the cable protection member 15, the anticorrosion layer 1 d of the power cable 1 is fixed using, for example, an insulating and anticorrosive tape or the like, and the stress applied to the power cable 1 is relieved. Hereinafter, the process of fixing the cable protection member 15 to the power cable 1 using a tape or the like is referred to as an anticorrosion process. Here, for a power cable having a line voltage of 154 kV or higher, the length of the tubular portion of the cable protection member 15 is such that the lower end surface of the tubular portion is the lower end surface of the support fitting 12 as shown in FIG. From 0 to 200 mm, more preferably from 0 mm to 50 mm, it is preferable from the viewpoints of ease of assembly, suppression of the amount of protrusion from the lower end surface of the support fitting 12, and the like. The protective flange portion of the cable protection member 15 is attached to the adapter flange portion of the oil stopper adapter 14b using screws 25a and an O-ring 25b.

The support fitting 12 is formed with a hole through which the power cable 1 is inserted in the center, and is attached to the gantry 13 via a support insulator 21d, for example. However, anything may be used instead of the support insulator 21d as long as the support metal 12 and the gantry 13 are insulated. An adapter flange portion of the oil stopper 14b is fixed to the upper surface of the support fitting 12. Here, in order to satisfactorily position and fix the adapter flange portion 14b ₂ to the support fitting 12, as shown in FIG. A ring-shaped groove that fits with the flange portion 14b ₂ may be provided.

The adapter flange portion 14b ₂ of the oil stopper 14b presses the adapter flange portion 14b ₂ against the support fitting 12 side by a fixing bracket 21a and a screw 21b that are integrally provided in advance on the outer periphery of one end of the flange tube 11 and the flange tube 11. It is fixed in this way. Here, the soot tube 11 and the fixing bracket 21a are in close contact with each other, and the fixing bracket 21a is fixed to the oil stopper adapter 14b with a screw 21b so as to ensure hermeticity using an O-ring 21c. Further, the cable holding end surface of the soot tube 11 is in close contact with the upper surface of the support fitting 12.

  The conductor lead bar 16 is connected to the conductor 1a, and is fixed to the end surface facing the cable holding end face of the soot tube 11 using a lead bar fixing flange 17, as shown in FIG. Is fixed to a mounting bracket that is integrally provided in advance on the outer periphery of the other end.

Hereinafter, with reference to FIG. 3, the assembly of the power cable termination connecting apparatus 101 of the present invention will be described.
First, as shown in FIG. 3A, the power cable 1 with the conductor 1a, the insulator 1b, the semiconductive layer 1c, and the anticorrosive layer 1d exposed to a predetermined length is arranged at a predetermined position with respect to the gantry 13. The process of exposing each part of the power cable in this way is referred to as cable opening process.

Next, as shown in FIG. 3B, the cable protection member 15 is disposed on the outer periphery of the anticorrosion layer 1d of the power cable 1, and the oil stopper member 14a is used on the outer periphery of the semiconductive layer 1c by using an attachment member (not shown). located in the power cable 1, semiconductive 1c and fitted with a stress cone 22a disposed at the boundary between the insulator 1b, half the tape 22b to span the bottom of the upper portion and the stress cone 22a of oil-stop pipe portion 14a ₁ It is wound around the conductive layer 1c to give an oil stop treatment, and the conductor lead bar 16 is attached to the conductor 1a of the power cable 1 by caulking. Each member of the cable protection member 15, the oil stop member 14 a, and the stress cone 22 a is provided so as to be inserted into the power cable 1.

Next, as shown in FIG. 3 (c), the support fitting 12 is attached to the mount 13 via the support insulator 21d, the oil stopper adapter 14b is attached, and the inner surface of the cylindrical portion 14b ₁ is attached to the oil stopper member 14a. The adapter flange portion 14b ₂ is inserted into contact with the outer peripheral surface of the portion 14a ₂ , and the adapter flange portion 14b ₂ is fitted and arranged in a ring-shaped groove formed on the upper surface of the support fitting 12. And the cylindrical portion 14b is screwed a clamping bracket 24a to the screw portion provided on the outer peripheral surface of the _1, fastened to the cylindrical portion 14b ₁ of the mounting portion 14a _2, wherein the attachment fittings 24a fastening by means of screws 24b attached to part 14a _2, to fix the oil-stop member 14a and Aburatome adapter 14b. At this time, the oil-stop members 14a and Aburatome adapter 14b, the sealing performance by the prearranged O-ring 24c on the outer peripheral surface of the mounting portion 14a ₂ is ensured. In addition, each member of the support metal fitting 12, the oil stopper adapter 14b, and the fastening metal fitting 24a is also provided by being inserted into the power cable 1.

Next, as shown in FIG. 3 (d), an O-ring 21 c is attached to the groove provided on the upper surface of the adapter flange portion 14 b ₂ of the oil stopper adapter 14 b, and the soot tube 11 is attached to the adapter flange so as to enclose the power cable 1. provided on the upper surface parts 14b _2. At this time, the O-ring 21c is disposed so as to be in close contact with the fixing bracket 21b, but may be disposed so as to be in close contact with the end surface of the soot tube 11. The mounting attract fixing bracket 21a with screws 21b to the support member 12, sandwiches the adapter flange portion 14b ₂ for fixing the porcelain bushing 11 and the mounting member 12. Further, the flange portion of the cable protection member 15 is attached to the lower surface of the adapter flange portion 14b ₂ via the O-ring 25b using the screw 25a. Then, the anticorrosion tape 25c is wound around the tubular portion of the cable protection member 15 and the power cable 1, and the anticorrosion treatment is performed.

  Next, as shown in FIG. 3 (e), insulating oil is injected into the soot tube 11, and the drawer rod fixing flange 17 is arranged around the conductor lead rod 16 using the mounting bracket 23 a and the screw 23 b, and the soot tube 11 Secure to the top of the.

  FIG. 4 is a diagram for explaining the difference between the power cable termination connection device of the present invention and the conventional power cable termination connection device. In the conventional power cable termination connecting device 201 shown in FIG. 4A, the oil stopper member 214 and the cable protection member 215 extend below the support fitting 12, and the space between the oil stopper member 214 and the cable protection member 215 is provided. Filled with insulating oil. And the oil stopper process is given to the lower end of the oil stopper member 214 and the cable protection member 215 using anticorrosion tape etc.

  On the other hand, the power cable terminal connection device 101 of the present invention shown in FIG. 4B has a structure in which the insulation oil retaining member 14 in the pipe is provided in the pipe 11 to ensure insulation and the cable protection member 15 can be shortened. Therefore, the protruding amount of the oil stopper member 214 and the cable protection member 215 below the support fitting 12 is longer as shown in the drawing than the conventional power cable terminal connection device shown in FIG. L minutes have been greatly shortened. Along with this, the amount of the insulating oil 202 filled in the power cable terminal connecting device can also be reduced.

  FIG. 5 is a diagram for explaining the difference between the power cable termination connecting device of the present invention and the conventional power cable termination connecting device. As shown in FIG. 5, the power cable termination connecting device 101 of the present invention can shorten the downward extension of the support bracket 12 of the power cable as compared with the conventional power cable terminating connection device 201. Excavation can be reduced to a small scale. Specifically, in order to bend the power cable 1 safely, it is necessary to bend the power cable 1 so that the radius of curvature is approximately 10 times or more the diameter of the power cable. As shown in FIG. Even when it is necessary to excavate the ground 301 to provide the underground cavern 302 for laying the power cable termination connecting device 201, the shallow ground pitch 303 can be used for laying the power cable terminating connection device 101 of the present invention. It will be possible.

FIG. 6 is an explanatory diagram for assembling the power cable terminal connecting device 102 of another aspect in which the cable protection member 15 is removed from the power cable terminal connecting device 101 of the present invention. First, as shown in FIG. 6A, the extraction process is performed in the same manner as described above. Next, as shown in FIG. 6 (b), the oil stopper 14a is attached to the outer periphery of the semiconductive layer 1c to the power cable 1 using an attachment member (not shown), and at the boundary between the semiconductive layer 1c and the insulator 1b. The stress cone 22a is attached and the tape 22b is wound around the semiconductive layer 1c so as to hang over the upper end of the oil stop pipe portion 14a ₁ and the lower portion of the stress cone 22a, and the oil stop treatment is performed. A conductor lead bar 16 is attached to the wire by caulking. And the anti-corrosion tape 25c is wound around the power cable 1 and the anti-corrosion treatment is performed on the oil stop pipe portion 14a ₁ .

Next, as shown in FIG. 6 (c), the support fitting 12 is attached to the mount 13 via the support insulator 21d, the oil stopper adapter 14b is attached, and the inner surface of the cylindrical portion 14b ₁ is attached to the oil stopper member 14a. The adapter flange portion 14b ₂ is inserted into contact with the outer peripheral surface of the portion 14a ₂ , and the adapter flange portion 14b ₂ is fitted and arranged in a ring-shaped groove formed on the upper surface of the support fitting 12. And the cylindrical portion 14b is screwed a clamping bracket 24a to the screw portion provided on the outer peripheral surface of the _1, fastened to the cylindrical portion 14b ₁ of the mounting portion 14a _2, wherein the attachment fittings 24a fastening by means of screws 24b attached to part 14a _2, to fix the oil-stop member 14a and Aburatome adapter 14b. At this time, the oil-stop members 14a and Aburatome adapter 14b, the sealing performance by the prearranged O-ring 24c on the outer peripheral surface of the mounting portion 14a ₂ is ensured. In addition, each member of the support metal fitting 12, the oil stopper adapter 14b, and the fastening metal fitting 24a is also provided by being inserted into the power cable 1.

Next, as shown in FIG. 6 (d), an O-ring 21 c is attached to a groove provided on the upper surface of the adapter flange portion 14 b ₂ of the oil stopper adapter 14 b, and the soot tube 11 is attached to the adapter flange so as to enclose the power cable 1. provided on the upper surface parts 14b _2. At this time, the O-ring 21c is disposed so as to be in close contact with the fixing bracket 21b, but may be disposed so as to be in close contact with the end surface of the soot tube 11. The mounting attract fixing bracket 21a with screws 21b to the support member 12, sandwiches the adapter flange portion 14b ₂ for fixing the porcelain bushing 11 and the mounting member 12.

  Next, as shown in FIG. 6 (e), insulating oil is injected into the soot tube 11, and the drawer rod fixing flange 17 is disposed around the conductor lead rod 16 using the mounting bracket 23a and the screw 23b. Secure to the top of the.

  Note that the assembly order of the power cable terminal connection devices 101 and 102 is not limited to that described in the embodiment of the present invention. Further, in the above description, the insulating oil is stored as the insulating member in the insulating oil retaining member 14 in the pipe, but the insulating member is not necessarily limited to the insulating oil, and an insulating gas or other medium. May be used.

  The power cable termination connecting device according to the present invention has an effect that the projecting amount of the cable protection member from the support metal fitting can be reduced and the scale of the laying work can be reduced, and is used for termination and connection of the power cable. It is useful as a power cable terminal connection device.

FIG. 1 is a schematic diagram showing a cross-sectional structure of the left half side of the central axis of the power cable of the power cable terminal connecting device 101 of the present invention. FIG. 2 is an enlarged cross-sectional view of the oval portion shown in FIG. FIG. 3 is a diagram for explaining the assembly of the power cable termination connecting device 101 of the present invention. FIG. 4 is a diagram for explaining a difference between the power cable termination connection device 101 of the present invention and a conventional power cable termination connection device. FIG. 5 is a diagram for explaining the difference between the power cable termination connecting device of the present invention and the conventional power cable termination connecting device. FIG. 6 is a diagram for explaining the assembly of the power cable termination connecting device 102 of the present invention. FIG. 7 is a diagram for explaining the difference between the power cable termination connection device 102 of the present invention and the conventional power cable termination connection device. FIG. 8 is a conceptual diagram showing an example of a conventional power cable termination connecting device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric power cable 1a Conductor 1b Insulator 1c Semiconductive layer 1d Anticorrosion layer 2, 202 Insulating oil 11 碍 pipe 12 Support metal fitting 13 Mounting base 14 碍 Insulated oil retaining member 14a Oil stopper member 14b Oil stopper adapter 15 Cable protection member 16 Conductor extraction rod 17 Drawer bar fixing flange 21a Fixing bracket 21b, 23b, 24b, 25a Screw 21c, 24c, 25b O-ring 21d Support insulator 22a Stress cone 22b Mounting tape 23a Mounting bracket 24a Fastening bracket 25c Anticorrosion tape 101, 201 Power cable terminal connecting device 202 Insulating oil 215 Cable protection member 301 Ground 302 Underground cave 303 Ground pitch

Claims (6)

An inner pipe (11) holding the power cable (1) and the insulating oil (2) inside,
Of the two end faces of the soot pipe (11), it has a portion in contact with the cable holding end face that holds the power cable (1), and holds the insulating oil (2) integrally with the soot pipe (11) and the power cable (1). A power cable terminal connection device comprising:
An insulating oil retaining member (14) in the soot tube includes a flange portion (14b ₂ ) in contact with the cable holding end surface of the soot tube (11), and a cylindrical portion (14b) extending from the flange portion (14b ₂ ) along the soot tube (11). ₁ ) an oil stopper adapter (14b) having
The oil stopper adapter (14b) is disposed in the cylindrical portion (14b ₁ ), and is formed on the pipe portion (14a ₁ ) including the power cable (1) and the outer periphery of the pipe portion (14a ₁ ). The power cable (1) has an attachment portion (14a ₂ ) facing the inner surface of the cylindrical portion (14b ₁ ) of the oil stopper adapter (14b) via the O-ring (24c) and is oil-sealed. And an oil stopper member (14a) attached to
At the upper end of the cylindrical portion (14b ₁ ) of the oil stopper adapter (14b), a screw portion is provided on the outer peripheral surface opposite to the surface facing the O-ring (24c), and the screw portion of this cylindrical portion (14b ₁ ). a look write turning the tubular clamping bracket (24a) having the inner peripheral surface a threaded portion which is screwed to stop oil between Aburatome the adapter (14b) and the oil-stop member (14a), oil-stop member ( 14a) is fixed to an oil stopper adapter (14b) .   The power cable termination connection device according to claim 1, wherein the oil stop member (14a) is attached to the power cable (1) by an attachment member different from the stress cone (22a). Furthermore, the power cable termination | terminus connection apparatus of Claim 1 or 2 which has attached the shrinkable tube or the tape to the power cable (1) so that the said oil stop member (14a) may be applied. The power cable terminal connecting device according to any one of claims 1 to 3 , wherein the cylindrical fastening fitting (24a) is fixed to an oil stop member (14a). Furthermore, the flange portion (14b ₂ ) And a cable protection member (15) having a tubular portion extending downward along the power cable (1) from the protection flange portion,
The lower end surface of the tubular portion of the cable protection member (15) falls within a range of 0 mm or more and 50 mm or less vertically downward from the cable holding end surface of the soot tube (11). Power cable termination connection equipment. Flange (14b ₂ ) Is in contact with the cable holding end surface of the soot tube (11) on the top surface, and is formed on the top surface of the support fitting (12) attached to the gantry (13) via the support insulator (21d). In a state of being fitted to the groove, the fixing fitting (21a) provided on the outer periphery of the cable holding end surface side of the soot tube (11) is fixed so as to be pressed against the support fitting (12) side. Claim | item 1-5 electric power cable termination | terminus connection apparatus in any one.

Images