JPH05207633A - Joint box for oil filled power cable - Google Patents

Abstract

PURPOSE:To reduce the containing space at the time of laying cable by restricting projection of a part of connector from the outer periphery of casing thereby making compact a joint box. CONSTITUTION:A piping unit comprising a valve unit constituted of a connector body 6 secured from the inner side of a casing 4 to the bottom part of a recess 5 in the casing 4, a spring 12, a stopper 13, and a valve 14 is integrally tightened through bolts 20 to the casing 4 having a flange and jointed through plumbing part to an OF cable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-filled power cable connection box, and more particularly to an oil-filled power cable connection box in which the casing can be made compact to reduce the storage space during installation.

[0002]

2. Description of the Related Art In order to connect an OF cable (OF: Oil Filled) mainly used for underground power transmission lines in an oil-tight manner, a conventional oil-filled power cable connection box is filled with insulating oil inside the connection box. There is one shown in FIG. This oil-filled power cable connection box is arranged symmetrically with respect to a central axis at a predetermined position on the outer peripheral portion of a casing 4 and a casing 4 having a flange 3 joined to an OF cable 1 by a lead portion 2. Connector parts 80 and 81
And a stress cone 10 formed by an insulating paper 9 wound around the cable conductor connecting portion.

FIG. 5 shows a sectional structure of the connector parts 80 and 81 of the oil-filled power cable connection box in FIG. 4, in which a valve device including a bar 16 and a stopper 13, a valve 14 and a spring 12 is attached to a connector body 24. The connector body 24 has the nipple 15 fixed to the connector body 24 by screwing the nut 17, and further has the connector portion 80.
And a removable cap 26 is fitted so as to fit with and 81.

When injecting insulating oil into the oil-filled power cable connection box, first, after the work of joining the power cables is completed, the cap 26 of the connector portion 80 is opened to evacuate the connector body 24 by a vacuuming device ( (Not shown) to evacuate the inside of the casing 4.

On the other hand, a pipe (not shown) of an oil supply device is connected to the nipple 15 of the connector portion 81, and the degree of vacuum in the casing 4 is set to a predetermined value by vacuuming by a vacuuming device connected to the connector portion 80. Is indicated, the insulating oil is filled in the casing 4 from the pipe of the oil supply device. When the casing 4 is sufficiently filled with the insulating oil, the insulating oil overflows from the connector 80. At this time, when refueling is stopped and the nipple 15 is removed, the bar 16 is urged by the spring 12 to move upward, and the valve 14 is engaged with the stopper 13 to close the valve mechanism.

According to the above method, the degree of filling of the casing with the insulating oil is increased, the insulation characteristics and the heat deterioration characteristics are stabilized, and the reliability of the oil-filled power cable is improved.

However, the oil-filled power cable connection box is
It is necessary to form an insulating coating with, for example, a plastic tape in order to provide a prescribed anticorrosion performance similarly to the OF cable. However, since the connector portion projects from the outer periphery of the casing, the workability of the coating process is poor, and it is difficult to perform a sufficient insulating coating process. Therefore, there is a problem in that the oil-filled power cable junction box cannot have sufficient dielectric corrosion resistance, and as a result, it is difficult to maintain the dielectric corrosion protection performance for a long period of time.

In order to solve the above problems, the oil-filled power cable connection box shown in FIGS.
No. 030. In this oil-filled power cable connection box, connector parts 82 and 83 are inserted and fixed to the bottom part of the recessed part 5 symmetrically arranged with respect to the shaft part at a predetermined position on the outer peripheral part of the casing 4. The connector portions 82 and 83 have a cap 26 that is substantially flat with the outer peripheral surface of the casing 4. Connector body 2
The nut 17 is screwed to the nipple 15
Is fixed. The cap 26 is formed so as to be inserted into the recess 5 so that the upper surface thereof substantially coincides with the outer peripheral portion of the casing 4, and the connector portions 82 and 83 fixed to the bottom portion of the recess 5 are continuous from the lower portion thereof. A conduit 7 is formed in the casing 4 so as to be taken out along the shape of the recess 5 and the open end of which rises up to near the outer peripheral portion of the casing 4. The other configurations are the same as those of the oil-filled power cable junction box described above, and a description thereof will be omitted.

[0010]

However, in the conventional oil-filled power cable junction box, the connector portion protruding into the casing interferes with the stress cone, and it is difficult to insert the casing into the outer periphery of the power cable. Therefore, there is a problem in that the casing diameter needs to be expanded and the casing length needs to be expanded, so that the oil-filled electric power cable connection box becomes larger than necessary, and the storage space for laying the connection box becomes large. Therefore, it is an object of the present invention to provide a connection box for oil-filled power cables, which allows the connection box to be made compact and the storage space when installed to be small.

[0011]

According to the present invention, in order to make a junction box compact and to reduce the storage space during installation, the casing has a recess having a depth smaller than the length of the connector, and the connector has a recess in the casing. Each of the oils is fixed in a concave portion in such a manner that it protrudes inward and outward by a predetermined length, and its inwardly projecting end is connected to an oil conduit arranged so that its open end is close to the inside of the casing. Provide an input power cable connection box.

[0012]

According to the oil-filled power cable connection box of the present invention,
A recess is formed at a predetermined position on the casing with a depth smaller than the length of the connector, and the connector is fixed so that the top of the connector is aligned with the outer peripheral surface of the casing. Since it does not project, the outer peripheral surface of the casing can be made uniform. At the same time, the length projecting inward from the inner peripheral surface of the casing also becomes shorter.

[0013]

[Embodiment 1] Hereinafter, an oil-filled power cable connection box of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of the present invention, in which a casing 4 having a flange 3 formed by a lead portion 2 is joined to an OF cable 1, and a connector body 6 is fixed to the bottom of a recess 5 of the casing 4. .. The connector body 6 includes a conduit 7a taken out from the passage 7 so as to be parallel to the inner wall of the casing 4. A stress cone 10 formed of insulating paper 9 is provided around the cable conductor connecting portion, and the end portion of the OF cable 1 and the lead wire portion 2 are anticorrosion coated with an anticorrosion tape 11.

FIG. 2 shows a sectional structure of the connector portion fixed to the concave portion 5 of the casing 4, in which the valve 14 pressed against the stopper 13 by the spring 12 in the passage 7.
And a bar 16 that pushes down the valve 14 with the nipple 15.
The pipe flange 19 to which the nipple 15 is fixed by the nut 17 screwed into the opening 18 of the connector body 6 is fastened to the upper portion of the connector body 6 by the bolt 20.

This connector body 6 and the piping flange 19
The joint surface of the O
A ring 21 is inserted, and a pipe 22 from an oil supply device or a vacuuming system (neither is shown) is connected to the nipple 15.

To fill the casing 4 with insulating oil, first,
Connect the pipe 22 connected to the vacuum system to the nipple 15 of the connector part and connect the nipple 15 of the other connector part.
A pipe 22 connected to the oil supply device is connected to.

By vacuuming the inside of the casing 4 from the connector portion to which the pipe 22 connected to the vacuuming system is connected, the casing 4 is connected to the oil supply device when the degree of vacuum in the casing 4 shows a predetermined value. Piping on the connector 2
Oil is supplied from 2 to fill the casing 4.

When the casing 4 is sufficiently filled with the insulating oil, the insulating oil overflows from the other connector body 6. At this time, the bolt 2 is attached to the upper surface of the connector body 6.
The pipe flange 19 fastened by 0 is removed.

When the pipe flange 19 is removed, the nut 1
Nipple 15 fixed to the opening 18 by screwing 7
Are removed at the same time. At this time, the check mechanism (semi-stop mechanism) incorporated in the connector body 6 operates. That is, by removing the nipple 15 fixed to the pipe flange 19 by screwing the nut 17, the bar 16 holding the valve 14 is released, so that the valve 14 comes into close contact with the stopper 13 by the reaction force of the spring 12. Then, the passage 7 is shut off. This interruption can prevent the insulating oil from flowing out of the casing 4.

After that, as shown in FIG. 3, a sealing flange 23 is formed on the upper surface of the connector main body 6 with a bolt 20 so that the shape of the upper surface is substantially the same as the outer peripheral portion of the casing 4. To do. This sealing flange 23
The bolt is fastened with a bolt 20 to seal the outside of the connection box and the inside of the casing 4 with an O-ring 21 provided on the joint surface with the connector body 6.

As described above, after the casing is filled with the insulating oil, the pipe flange is removed, and the sealing flange is tightened, so that the casing sufficiently oil-tightened by filling the insulating oil by evacuation to the outside. Seal it against. In this way, it is possible to provide a compact oil-filled power cable connection box that has a small storage space when the connection box is installed. Since the upper surface of the sealing flange is formed so as to substantially coincide with the outer circumference of the casing, no projecting portion is formed on the outer circumference of the casing, and the anticorrosion insulation coating process of the connection box can be performed easily and reliably.

[0022]

As described above, according to the oil-filled electric power cable junction box of the present invention, the casing has the recessed portion having a depth smaller than the length of the connector, and the connector has a predetermined length inward and outward of the recessed portion of the casing. Since it is fixed in the concave portion in a protruding state, and the inward protruding end portion is connected to the oil conduit arranged so that the open end portion is close to the inside of the casing, the casing outer peripheral portion and the inner peripheral portion are formed. By suppressing the protrusion of the connector part, the connection box can be made compact and the storage space during installation can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an oil-filled power cable junction box showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a connector portion of an oil-filled power cable junction box showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a connector portion to which a sealing flange of an oil-filled power cable junction box according to an embodiment of the present invention is fixed.

FIG. 4 is a cross-sectional view showing a conventional oil-filled power cable junction box.

FIG. 5 is a cross-sectional view showing a connector portion of a conventional oil-filled power cable junction box.

FIG. 6 is a cross-sectional view showing a conventional oil-filled power cable junction box.

FIG. 7 is a cross-sectional view showing a connector portion of a conventional oil-filled power cable junction box.

[Explanation of symbols]

1 OF cable 2 Lead part 3 Flange 4 Casing 5 Recess 6 Connector body 7 Passage 7a Conduit 9 Insulating paper 10 Stress cone 11 Anticorrosion tape 12 Spring 13 Stopper 14 Valve 15 Nipple 16 Bar 17 Nut 18 Opening 19 Piping flange 20 Bolt 21 O-ring 22 Piping 23 Sealing flange 24 Connector body 26 Cap 80,81 Connector part 82,83 Connector part

Claims (1)

[Claims] 1. An oil-filled power cable in which a vacuuming device is connected to a connector fixed to the casing to evacuate the inside of the casing and an oiling device is connected to the connector to lubricate the inside of the casing. In the connection box, the casing has a recessed portion having a depth smaller than the length of the connector, and the connector is fixed to the recessed portion in a state of protruding by a predetermined length inside and outside the recessed portion of the casing, respectively. An oil / power cable junction box having a configuration in which an inwardly projecting end is connected to an oil conduit arranged so that an open end is close to the inside of the casing.