JP3161651B2 - Clean case used to form prefabricated connections - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clean case used for incorporating an insulating member into a connection portion of a cable of a high-voltage transmission line, and more particularly, to a case where a connection portion is formed using a clean room. The present invention relates to a clean case used for forming a prefabricated connection portion so that an operation of assembling an insulating member constituting an insulator can be easily performed using a clean case provided so as to separately cover only a connection portion.

[0002]

2. Description of the Related Art C used for a 275 kV high-voltage transmission line
In a V cable or the like, a conductor is connected using a conductor connection pipe, and an insulating material such as plastic is formed in a cone shape on an outer peripheral portion thereof by means such as extrusion molding. For example, in an example shown in Japanese Utility Model Application Laid-Open No. 58-103530, a portion where a cable conductor is connected using a conductor connection pipe and a periphery of a cable connected via the conductor connection pipe are within a predetermined range. A conical insulating portion is formed over the entire surface, and a protective member is arranged on the outer peripheral portion of the insulating portion. However, as described above, forming an insulating part by extruding a plastic material has a problem that a lot of time is required for forming the insulating part, and the inside of a sinus is very narrow. However, there is also a problem in the workability of connecting cables.

In order to cope with the above-mentioned problem, it has been proposed that the insulating member disposed at the conductor connecting portion is configured as a so-called prefabricated joint insulating portion (hereinafter referred to as a prefabricated connecting portion). I have. In the prefabricated connection part, for example,
As shown in Japanese Patent No. 723 and the like, an insulating molded body formed of an epoxy resin material into a substantially cylindrical shape is positioned with respect to a conductor connecting tube for connecting a conductor, and a substantially cone-shaped formed of EP rubber is provided on both sides thereof. It is configured by mounting a pre-mold insulator. A prefabricated connecting portion as shown in the conventional example is generally configured as shown in FIG.

In the example of the prefabricated connection shown in FIG. 12, the conductors 2 of the two cables 1, 1a to be connected,
2a is connected using a conductor connection tube 7, and the internal electrode 1 of the insulating molded body 11 is made to correspond to the center of the conductor connection tube 7.
2 so that the inner surface of the internal electrode 12 is fixed to the outer peripheral portion of the conductor connection tube. In addition, the pre-molded insulators 15 and 15a are inserted into the tapered portions on both sides of the insulating molded body 11 with respect to a gap formed between the insulating molded body 11 and the cable, and these three insulators are combined. A prefabricated connection 10 is formed. Further, a main body case 23 is arranged on the outer peripheral portion of the prefabricated connection portion 10, and an insulator crimping device 18, an insulating cylinder 22 and the like are arranged on both sides of the prefabricated connection portion. On both sides of the main body case 23 that covers the prefabricated connection section 10, a cable protection fitting 20 and a waterproof processing section 21 are disposed so that the cable connection section can be protected.

[0005]

However, FIG.
As shown in, the operation of forming the prefabricated connection is
It is necessary to perform the operation in a clean room, and it is obligatory to perform the operation so that dust and dirt do not adhere to the joint between the insulating molded body and the pre-molded insulator. And, for example, when laying a cable in a cave, a clean room is formed by using a means such as separating a cable connection work point in the cave from other parts, and the worker changes into special clothes, It is necessary to enter the work room and perform work.

Further, when performing the work of forming the prefabricated connection part, the work of assembling the premolded insulator after positioning and fixing the insulating molded body to the cable connection part is performed. Workers push by hand. Therefore, when performing the assembling work, the hand of a worker, a working tool, or the like may touch or scratch the surface of the insulating member. In particular, when the insulating molded body and the pre-molded insulator are fitted together, it is necessary to prevent the worker from touching the insulating interface which influences the performance of the prefabricated connection portion and also prevent dust from being attached. Therefore, in order to avoid such a problem that the insulating characteristics are deteriorated with respect to such an insulating interface, at the time of work,
It is required to perform the treatment with sufficient care so that the worker does not come into contact with the dust or adhere to the dust. At present, there remains a drawback that the work efficiency is greatly reduced.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to solve the problem of the conventional prefabricated joint forming operation as described above, and to dispose the prefabricated joint at the prefabricated joint so that only the part where the insulating member is assembled is covered by a small clean case. Forming a prefabricated connection part that enables the formation of the insulating member to be performed in a dust-free environment, and enables the work to be performed in a state where the hands and tools of the worker do not directly contact the joint part of the insulating member. The purpose is to provide a clean case to be used.

[0008]

According to the present invention, a cable conductor is connected by using a conductor connecting tube, a plastic insulating molded body is disposed at the connecting portion, and a side portion of the insulating molded body is disposed from the side of the insulating molded body. The present invention relates to a clean case used for an operation of forming a prefabricated connection portion formed by inserting a pre-molded insulator formed of an elastic body. In the present invention, the clean case is formed of a substantially cylindrical transparent member, and the clean case is configured so that two cylindrical members are slidable with each other so that the length can be changed. A through-hole for passing a cable is formed in the flange of one member of the case, and the other member of the clean case is configured with a window portion for performing an internal operation using an opening / closing door means,
A mechanism for assembling the insulating member in a state where the connection portion of the cable is housed inside the clean case is configured.

As described above, in the present invention, when forming a cable connection portion, a small clean case is used so as to cover only a working portion thereof. Can be assembled in an environment isolated from workers. Therefore, since only the part for assembling the insulating member is covered with the clean case, workers and tools do not directly touch the insulating member, and the joint of the insulating member is not damaged. Performance can be improved. Then, inside the clean case, the worker can perform the work without directly touching the insulating member, so that the assembling work can be easily performed.

[0010]

Embodiment 1 As shown in FIG. 12, when a prefabricated connecting portion is formed by using a pre-molded insulating molded body and a pre-molded insulator, as shown in FIGS. Thus, a cable is connected, and each component is attached to a connection portion of the cable. When processing the connection end of the cable, as shown in FIG.
The conductors 2 and 2a are exposed at the ends of the V cables 1 and 1a. In addition, for the cable body, the insulator 3, the external semiconductive layer 4, and the external shielding layer 5 are exposed over a predetermined length to the exposed portion of the conductor 2,
The same processing as the conventional cable connection part is performed.

A conductor connection pipe 7 used to connect the conductors 2 and 2a of the two cables in a state where they face each other is:
Like the conventional conductor connection pipe, conductor insertion portions 9 and 9a are provided on both sides of the main body 8. And after inserting the conductor,
Electrical and mechanical fixing is performed by tightening the conductor insertion portions 9 and 9a, respectively. But,
In the embodiment of the present invention, as shown in FIG. 2 and subsequent figures, an operation of attaching an insulating molded body, a pre-molded insulator, or the like is performed with the conductor connection pipe 7 attached to the conductor of one of the cables. Like that.

First, as shown in FIG. 2, a pre-molded insulator forming a prefabricated connection part of the present invention is formed into a predetermined shape, and the pre-molded insulator is housed in a carry-in protection case 30 in a factory. Shipped from. In a state where the pre-mold insulator 15 is housed in the carry-in protection case 30, it is kept in a state of being shut off from the outside air unless the cover 32 is removed, so that dust and the like do not enter from the outside. Is held. The carry-in protection case 30 shown in FIG. 2 is carried into a connection site while being supported by an insertion guide 33 that is arranged to protrude into the box-shaped main body. Until the pre-mold insulator 15 is fixed to the cable, a protective member 16a is mounted on the surface of the tapered portion on the insertion side of the pre-mold insulator 15, and the protective member 16a is used. Thus, the pre-molded insulator slides with respect to the cable.
The pre-mold insulator 15 configured as described above is
After being taken out of the case main body, as shown in FIG.

In the example shown in FIG. 3, the conductor connecting pipe 7 is attached to the conductor with respect to the connecting end of the cable 1 housed in the clean case 40, as shown in FIG.
Is connected. The surface of the insertion guide 33 and the surface of the cable 1 are configured to be flush, and in a state where the insertion guide is connected to the end of the cable,
Using the insulator inserter 37, the pre-mold insulator 15 is moved while sliding on the cable surface. The insulator inserter 37 is provided with locking members 39, 39a at the distal ends of the arm members 38, 38a, respectively. By moving the member, the pre-mold insulator 15 is moved to the working position for forming the prefabricated connection. As shown in FIG. 4, a pre-molded insulator 15 attached to the other cable 1a is provided.
Is attached to the cable in the same manner as in the case of the pre-molded insulator 15. In other words, another clean case 40
In the state where the insertion guide 33 is connected to the end of the cable housed in the
a to move the prefabricated connection part to a preparation position for assembly.

The insulating molded body for forming the prefabricated connection portion by combining the pre-molded insulator 15 is formed by using an epoxy resin or the like as in the case of the conventional insulating molded body. As shown in FIG. 12, the internal electrode is arranged so as to be integrally embedded in the small-diameter portion at the center. The insulating molded body is configured as shown in FIG. 5, and the outer peripheral portion is configured in a cylindrical shape, but the through holes arranged inside are formed so that the diameter decreases from both sides in the axial direction. It is formed in a tapered shape. A protection sheet 14 is provided on the surface of the through-hole of the insulating molded body 11 to provide means for preventing dust and the like from adhering to the surface in contact with the outer peripheral portion of the pre-molded insulator. further,
Dustproof lids 11a are attached to both sides of the insulating molded body so as to cover the through holes, so that dustproof during transportation can be prevented from contacting other objects.

The insulating molded body 11 having the structure as shown in FIG. 5 follows the pre-molded insulator 15 mounted on the cable 1 as shown in FIG. 3 and then as shown in FIG. Then, it is attached to the cable 1 and slid along the cable 1 to a standby position for assembling the prefabricated connection portion. After that, in the state shown in FIG.
Are connected to the conductor connection pipe 7 and tightened, and as shown in FIG. 7, the work of connecting the conductors of the two cables is performed. As shown in FIG. 7, the pre-molded insulator 15 and the insulating molded body 11 are attached to one cable 1 and the pre-molded insulator 15 is attached to the other cable 1a. After connecting the conductors, as shown in FIG.
Positioning is performed by moving the insulating molded body 11 corresponding to the part.

In the state shown in FIG. 7, the protection members respectively attached to the pre-mold insulator 15 are removed so that the pre-mold insulator can be assembled. The tapered surface is left covered with the protective sheet 14.
As shown in FIGS. 6 and 7, when the pre-mold insulator 15 is slid in the reverse direction with respect to the cable, the locking member 3 provided at the distal end of the arm member 38, 38a is used.
The adapter 17 is attached to the components 9 and 39a so as to provide a pressing action via the adapter 17.

Then, as shown in FIG. 8, the insulating molded body 11 is positioned corresponding to the position of the conductor connection pipe 7, and
After fixing the insulating molded body to the conductor connection pipe, the pre-molded insulators 15 and 15 are inserted between the tapered openings on both sides of the insulating molded body 11 and the cable surface, respectively. Prefabricated connection 1 as shown in FIG.
An operation of forming 0 is performed. When assembling the pre-molded insulator with respect to the insulating molded body, as shown in FIG. 8, the pre-molded insulator is inserted using the insulator inserter 37 inside the clean case 40 provided on both sides of the connection portion. Using a means for moving the body, the pre-mold insulator 15 disposed on both sides of the insulating molded body 11 is moved along the cable while pressing.

When the pre-molded insulator is mounted on the insulating molded body, the protective sheet 14 covering the surface of the tapered portion of the pre-molded insulator and the surface of the opening of the insulating molded body are separated. The protective sheet 16 that is covered is removed, and a prefabricated connection portion is formed in a state where dust and the like do not adhere to the joint surface of both members. After forming the prefabricated connection portion, a pressing mechanism for the premolded insulator is arranged, a main body case is attached to an outer peripheral portion of the prefabricated connection portion, and cable protection is performed on both sides of the prefabricated connection portion. By arranging metal fittings and an insulating tube and performing waterproofing, an insulating portion as shown in FIG. 1 can be formed.

[0019]

Embodiment 2 Structure of Clean Case FIGS. 3 and 4
As shown in FIG. 8 and FIG. 8, when performing the work of attaching the insulating molded body 11 and the pre-molded molded body 15 to the cable, and when forming a prefabricated connection portion by combining those members, It is configured to work inside the clean case. As shown in FIGS. 9 to 11, the clean case of the present invention uses members configured in a substantially cylindrical shape, and by configuring each member with a transparent acrylic resin or the like, the working state can be viewed from the outside. It can be so. As shown in FIG. 9, the clean case 40 includes a main body 41 and a side member 45 which are formed in a substantially cylindrical shape.
In addition, it is configured in combination with the lid member 42, and by allowing the side member 45 to slide with respect to the main body 41, the entire length L of the clean case can be adjusted. Further, in the clean case, seal members 43 and 46 are disposed at respective connection portions between the side member 45 and the lid member 42 disposed on both sides of the main body so that dust and the like do not enter from the connection portions. Is done.

The main body 41 of the clean case 40 includes:
At a position at a predetermined distance L1 from the end where the lid member 42 is provided,
Work openings 44 and 44a are provided, and a cover member provided with a seal member can be attached to the openings. The openings 44 and 44a cover the protective sheet covering the inner surface of the tapered opening of the insulating molded body 11 and the tapered portion of the pre-molded insulator 15 when handling the insulating member inside the clean case. Used as a work hole when removing the protective sheet. Further, when performing other operations such as combining the pre-molded insulator with an insulating molded body, by closing the opening of the clean case with a lid member, the inside can be maintained in a sealed state. I do.

As shown in FIGS. 10 and 11, the clean case 40 is configured such that a cylinder can be formed by combining a semicircular upper member 50 and a lower member 51. For this purpose, the sides of both members are hinged.
2 and 3 are provided so as to be openable and closable, and stop members 53 are disposed on the other side so that the closed state can be maintained. Further, in the clean case 40, the lid member 42 shown in FIG. 9 is configured as a removable member, and as shown in FIGS. When removing, for example, the cover member 42 is removed.
On the other hand, as shown in FIG. 10, the side member 45 is formed in a cylindrical shape having a larger diameter than the main body 41, and is provided slidably with respect to the main body. And the side member 4
5 is provided with a cable through-hole 55 at the center of the end plate member 47 at the end so that the cable end to be subjected to the insulation treatment is inserted into the clean case 40 through the cable through-hole 55. ing. The cable through hole 55
Besides, in order to guide the arm member of the insulator insertion machine,
Arm holes 56 and 57 are arranged at predetermined intervals.

The cable through hole 55 and the arm hole 5
Numerals 6 and 57 are arranged along a straight line passing through the axis of the clean case. As shown in FIG. 11, the upper member 50 is opened via the hinge with respect to the lower member 51 of the clean case. In this state, the cable through hole and the arm hole remain in a semicircular shape along the dividing line. In addition, seal members 58 and 59 are provided at the joint between the upper member 50 and the lower member 51 constituting the clean case.
When a clean case having a substantially cylindrical shape is formed by combining both members, it is possible to maintain a state in which the inside of the clean case is shut off from the outside air by the seal member. Furthermore, the end plate member 47 of the side member 45
By disposing a seal member in each of the through-holes 55, 56, and 57, dust can be prevented from entering through gaps between the cable body, the arm, and the like inserted into the holes. In addition, since the arm positioned with respect to the arm hole is not only rotatable but also has a screw formed around it, the seal member disposed in the arm hole rotates. It is necessary to use a material that does not cause abrasion or decrease in sealing performance by sliding on the screw member.

The clean case of the present invention configured as described above is used when a pre-molded insulator is attached to a cable as shown in FIGS. For example, when attaching the pre-mold insulator 15 to the cable 1, in a state where the insertion guide 33 is connected to the end of the cable 1, the operating members of the insulator inserter 37 are combined, and As described above, the upper and lower members constituting the clean case are opened and combined with the cable. At this time, first, the member of the through hole formed in the lower member 51 is connected to the cable and the arm 38 of the insertion machine,
38a for each, and then
The upper member 50 is closed, and the connection portion of the cable is positioned inside the clean case. Then, the pre-molded insulator 15 is slid with respect to the cable housed in the clean case 40 so as to be fixedly held at a predetermined position.

Also, in the state shown in FIGS. 3 and 4, after the pre-molded insulator is moved inside the clean case 40, the insertion guide 33 left at the distal end of the cable.
Can be easily processed by opening the lid member 36 and taking it out. Further, FIGS.
After the pre-molded insulator is attached to each of the cables as shown in (1), the operation of attaching the insulating molded body 11 to one of the cables 1 is performed. Work can be performed with the case removed and the cable end exposed. Then, as shown in FIGS. 3 and 4, after attaching the pre-molded insulator to the cable, the protective member 16a covering the tapered portion of the pre-molded insulator is removed, and the tapered portion is inserted. As shown in FIG. 6, the adapter 17 is arranged between the locking member 39 of the machine 37 and the insulator 17 so as to push the insulator 15 from the opposite direction and move the insulator 15 along the cable.

In addition to the examples shown in FIGS. 3 and 4, according to the present invention, as shown in FIG. 8, a clean case is used even in the final stage of forming an insulating portion.
An operation of combining the pre-molded insulator with the positions on both sides of 1 is performed. In the final assembly process shown in FIG. 8, the tapered portion of the pre-molded insulator is inserted into the tapered opening on both sides of the insulating molded body 11 fixed to the cable connection portion. When combining them, the work should be performed inside the clean case. In the example shown in FIG.
In a state where the insulating molded body 11 is fixed to the portion of the conductor connection tube 7 to which the conductor a is connected, and the end of the insulating molded body 11 and the pre-molded insulators 15 and 15 are respectively covered,
The clean cases 40, 40 are respectively arranged. Then, an assembling operation can be performed while preventing dust and the like from entering a portion where the insulating member is formed by combining those members.

As shown in FIG.
Until the pre-mold insulator 15 is combined with the protective sheet 14, the surfaces of the joints of the respective members are protected.
6 so as to cover it. Then, when performing the assembling work of the insulating member, after removing the protective sheets covering the tapered portions of the respective members, the pre-molded insulator is pressed against the insulating molded body 11 at the center. To assemble. When removing the protective sheet covering the tapered portion of each member, as shown in FIG. 9, open the opening provided in the main body of the clean case,
When the worker inserts his hand and removes the protective sheet, the tapered joint is first exposed. Thereafter, the pre-mold insulators 15, 15 are
By moving toward the insulating molded body 11, the three members can be combined to form an insulating member.

As described above, when constructing the prefabricated connection portion of the present invention, the clean case 40 as described above is used.
In the state where the outside air and the connecting portion are cut off inside the clean case 40, the connecting portions of the members constituting the insulating portion are matched with each other, so that the connecting portion of the insulator constituting the connecting portion is formed. To prevent dust and the like from entering the device. In addition, the clean case of the present invention is large enough to accommodate the cable body and the insulating molded body, and thus can be easily used in a narrow place such as in a sinus. Furthermore, when the clean case is carried into a narrow place in the cave, or when the clean case is combined in the cave, the clean case of the present invention is formed small, and the main body and the side members are divided. Since it can be handled, it can be easily handled.

It should be noted that the clean case of the present invention configured as described above may be arbitrarily sized according to the size of the cable, the size of the insulating member forming the prefabricated connection part, and the like. Can be. Further, the arrangement position of the working opening formed in the main body of the clean case, the size of the opening, and the like can be arbitrarily configured according to the work. In addition to manufacturing the entire clean case using a transparent material, only the main body may be formed of a transparent member, and the other members may be formed of a translucent or opaque material.

[0029]

The clean case used for forming the prefabricated connection portion according to the present invention is constructed as described above. Therefore, when forming the cable connection portion, a small clean case is formed so as to cover only the working portion. By using the case, when assembling in a clean room, particularly, the assembling of a portion that affects the insulation characteristics can be performed in an environment isolated from workers. Therefore, since only the portion where the insulating member is assembled is covered with the clean case, workers and tools do not directly touch the insulating member, and the joints of the insulating member are not damaged. Performance can be improved. Then, inside the clean case, the worker can perform the work without directly touching the insulating member, so that the assembling work can be easily performed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an initial step of cable connection.

FIG. 2 is an explanatory view showing a state of a pre-molded insulator used in the present invention before shipment from a factory.

FIG. 3 is an explanatory diagram showing a state where a pre-molded insulator is transferred to one cable.

FIG. 4 is an explanatory view showing a state in which a pre-mold insulator is transferred to the other cable.

FIG. 5 is a side view of an insulating molded body used in the present invention.

FIG. 6 is an explanatory view showing a state in which a cable supports an insulating molded body.

FIG. 7 is an explanatory diagram showing a state where two cables are connected.

FIG. 8 shows an example of an insulating molded body positioned at a connection portion.
It is explanatory drawing which shows the state which incorporates a pre-mold insulator.

FIG. 9 is a side view of the clean case of the present invention.

FIG. 10 is a sectional view of a main part of FIG. 9;

FIG. 11 is an explanatory view showing a state where a clean case is opened.

FIG. 12 is an explanatory diagram illustrating a configuration of a general prefabricated connection unit.

[Explanation of symbols]

1 cable, 2 conductors, 7 conductor connection pipe,
10 prefabricated connections, 11 molded insulation, 1
2 internal electrode, 15 pre-mold insulator, 25
Sleeve fixing bracket, 30 Protective case, 33
Insertion guide, 37 insulator inserter, 40 clean case, 41 body, 42 lid member, 43
Sealing member, 44 opening, 45 side member, 47 end plate member, 50 upper member, 51 lower member, 55 cable through hole, 56, 57 arm hole.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-316620 (JP, A) JP-A-6-253443 (JP, A) JP-A-4-255410 (JP, A) 48213 (JP, U) Japanese Utility Model 60-121141 (JP, U) Japanese Utility Model Application Hei 4-47324 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G 15/00 H02G 1 /14

Claims (1)

(57) [Claims] A cable conductor is connected using a conductor connection tube, a plastic insulation molded body is disposed at the connection portion, and a pre-molded insulator molded from an elastic body is formed from a side of the insulation molded body. A clean case used for an operation of forming a prefabricated connection portion by inserting the clean case, wherein the clean case is formed of a cylindrical transparent member, and the clean case is provided with two cylindrical members slidably with each other. The length of the clean case can be changed, a through hole for passing a cable is formed in the flange of one member of the clean case, and the other member of the clean case has a window portion for performing internal work. The opening and closing door means are used to assemble the insulating member in a state where the connection portion of the cable is housed inside the clean case. Nkesu.