JPH03846Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a Y-branch junction box for a three-core OF cable.

In the Y-branch junction box for this type of 3-core OF cable, as shown in Figure 1, one trunk side OF
Three Y-branch junction box bodies 4, 4, 4 are provided between the cable 1 and the two branch-side OF cables 1, 1, and a three-prong branch box at the terminal of one trunk-side OF cable 1. The three branch pipes (wire cores) separated and led out from 2 are branched and connected to each Y branch junction box body, and the three branch pipes 2 are connected to the terminals of the two branch OF cables 1, 1. , 2, three branch pipes (wire cores) 3, 3, 3 each led out from
and 3, 3, 3 are connected one by one to each Y-branch junction box 4, thereby configuring a predetermined Y-branch junction box.

In the Y-branch junction box configured in this way,
Conventionally, the three-way branch box 2 was equipped with a temporary oil stop device, but the Y-branch connection box main body 4 was not equipped with a temporary oil stop device. For this reason, vacuuming and lubricating the junction box, which are necessary for this type of connection, take a lot of time and man-hours, and not only do they tend to affect the insulation performance of the connection. Incidentally, each OF cable must be connected to the Y-branch junction box body three times, and if the assembly of the three-prong branch box 2 and branch pipe (wire core) 3 is included, the work requires one For example, on the first day, only one phase is required, and the branch pipe (wire core) 3 led out from the three-pronged branch box at the terminal of each OF cable 1, 1, 1 is connected to the Y branch junction box main body 4. ，
3 and 3, cover the other phases with a night cap, and then vacuum and lubricate. Then, it was necessary to set up a process in which the remaining phases would be subjected to the same work as above at a later date (for example, on the second day). In that case, when the night caps of the remaining phases are removed and the connection work is carried out at a later date, the oil that has already been vacuum-oiled will flow out through the branch pipe and be exposed to the atmosphere. For this reason, when the work on the remaining phases is completed, it is necessary to perform vacuum lubrication again, including the Y-branch junction box 4, branch pipe, and three-prong branch box 2, which were vacuum-lubricated after completing the previous work. It required work.

The present invention solves the inconveniences of the conventional Y-branch junction box during assembly, and provides a Y-branch junction box that improves assembly work efficiency, shortens assembly time, and improves the performance of the Y-branch junction box. With the goal.

That is, as shown in the attached drawings, the Y-branch junction box for 3-core OF cables according to the present invention has one main 3-core OF cable 1 extending on one side and two branch-side OF cables extending on the other side. 3-core OF cable 1,1
Three Y branch junction box bodies 4, 4, 4 are provided between them, and for each of these Y branch junction box bodies,
The three branch pipes 3, 3, 3 led out from the three-pronged branch box 2 at the terminal of one trunk side three-core OF cable 1 are individually connected, and the two branch side three-core OF cables 1, 1 are connected individually. Three branch pipes 3, 3, 3 and 3, 3, 3 led out from the three-pronged branch box 2, 2 at each terminal
In the Y-branch junction box for three-core OF cables, which has a structure in which one cable is connected from each cable, in any of the three Y-branch junction box bodies 4, 4, 4, the junction box body body tube 5 A temporary oil stop device 10 is provided at the end of the branch pipe 3 drawn into the interior, and an on-off valve 14 is attached directly or indirectly to this temporary oil stop device 10. By opening and closing the on-off valve 14, each Y
Branch connection box main body 4, 4, 4 and three-pronged branch box 3 in each three-core OF cable on the trunk side and branch side,
It is characterized in that it is configured so that the oil communication with 3 and 3 can be opened or closed.

FIG. 2 shows the main parts of the Y-branch junction box main body 4 shown in FIG. Connected. A temporary oil stop device 10 such as a lead pipe is installed across the terminal of the branch pipe 3 in the trunk pipe 5 of the junction box body and the insulator 6 of the cable core led out from the branch pipe. 3 and the insulator 6 of the cable core to prevent oil from flowing out from between. In that case, a fluororesin tape 15 may be interposed between the insulator 6 of the branch pipe 3 or the cable core and the temporary oil stopper 10 to make it oil-tight.

The temporary oil stop device 10 includes a flexible spiral pipe 11.
is installed, and finally the on-off valve 14 on the copper pipe 5 at the end of the Y-branch junction box body is installed as shown in the figure.
is connected with. That is, when compressing the sleeve in the conductor of the cable core and thereby forming the reinforcing insulation 7 on the conductor connection part, a blind plug is placed at the connecting connector 12 provided at the tip of the helical tube 11 to prevent oil from flowing out. do. After completing these operations, move the Y branch junction box main body end body pipe 5 to its normal position, remove the blind plug of the connecting connector 12, and
Opening/closing valve 14 provided on the end body tube 5 of the branch connection box main body
The connecting pipe 13 and the connecting connector 12 are connected.

Furthermore, in order to remove air bubbles in the spiral tube 11, the on-off valve 14 is opened, and after the overflow of oil is removed, the on-off valve 14 is closed, and lead work and vacuum oiling work are performed.Finally, the on-off valve 14 is opened. ,
The oil passages between the three-prong branch box 2 side and the Y-branch junction box main body 4 are communicated.

After the assembly is completed as described above, the end body tube 5 and the branch tube 3 side can be opened and closed by the opening/closing valve 14 if necessary.

Temporary oil stop device 10 incorporated as described above
The on-off valve 14 connected thereto is built into each of the three Y-branch junction box bodies 4, 4, 4.

Therefore, when performing vacuum lubrication work on a certain phase, by closing the on-off valves for the other phases, vacuum lubrication work can be performed only on that phase. In this manner, vacuum lubrication work for each phase can be performed without affecting other phases by operating the on-off valves connected to the temporary lubrication device.

As explained above, the three principles involved in this invention
According to the Y-branch junction box for OF cables, the following remarkable effects can be achieved.

The temporary oil stop device attached to the branch pipe end of the Y-branch junction box body separates the oil of each phase, so vacuum lubrication work for each phase can be performed independently, eliminating duplication and significantly reducing work time. It is possible to achieve significant shortening.

Since duplication of lubrication work is eliminated, the amount of oil used is also extremely small, eliminating waste.

Since the phase that has already been worked on can be prevented from being exposed to the atmosphere again, there is no intrusion of the atmosphere or moisture absorption, and no deterioration of insulation performance occurs.

There is no oil leakage from the branch pipe side even during lead work.
Easy to work with.

It is preferable in terms of cable performance because it prevents smoke, gas, etc. from entering the branch pipe side during lead work.

If it becomes necessary to dismantle one phase for some reason, the other phases can be separated using on-off valves, so only the relevant phase can be dismantled and investigated individually.

Even when the three-pronged branch box is installed at a higher location than the Y-branch junction box body, the temporary oil stop device in the Y-branch junction box prevents oil from leaking, making lead work etc. easier.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the overall configuration of a Y branch junction box for a 3-core OF cable, and Figure 2 is an explanatory diagram showing the overall configuration of a Y branch junction box for a 3-core OF cable.
FIG. 3 is a cross-sectional explanatory diagram showing the main part of the Y-branch junction box body in the branch junction box. 1: 3-core OF cable, 2: 3-prong branch box, 3:
Branch pipe (wire core), 4: Y branch connection box body, 5: Y
Branch connection box body end copper tube, 6: Cable insulator,
7: Connection reinforcement insulator, 8: Lead work, 9: Lead work spacer, 10: Temporary oil stop device, 11: Spiral pipe, 12:
Connection connector, 13: Connection pipe, 14: Opening/closing valve, 15: Intervening tape.

Claims (1)

[Scope of utility model registration request] Three Y-branch junction box bodies 4,
4, 4 are provided, and for each of these Y branch junction box bodies, three branch pipes 3, 3, led out from the three-pronged branch box 2 at one terminal of one trunk side three-core OF cable are provided.
3 individually, and two branch side 3 cores.
3-prong branch box 2 at each terminal of OF cables 1, 1,
Three branch pipes 3, 3, 3 and 3 led out from 2,
In the Y-branch junction box for three-core OF cables, which has a structure in which one cable is connected to each cable, each of the three Y-branch junction box bodies 4, 4,
Also in 4, a temporary oil stop device 10 is provided at the end of the branch pipe 3 drawn into the trunk pipe 5 of the main body of the connection box,
An on-off valve 14 is attached directly or indirectly to this temporary oil stop device 10, and by opening/closing the on-off valve 14, each Y branch junction box body 4, 4, 4 and the 3-core OF cable on the trunk side and branch side each A three-core OF characterized in that it is configured such that oil communication with the three-pronged branch box 3, 3, 3 can be opened or closed.
Y branch connection box for cables.