JP3571958B2 - Power cable branch connection - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power cable branch connection portion for branching a cable in the middle of a power cable trunk line.
[0002]
[Prior art]
Conventionally, in order to supply power to each station of a railway, a power cable is laid along a railway line, a branch cable is branch-connected to the cable at each station, and necessary power is supplied to each station from the branch cable. Like that. Further, since the length of one power cable is limited to 200 to 300 m, it is necessary to connect the cable between stations. Conventionally, such a connecting portion employs an E-shaped branch connection so that an accident section can be easily separated when an accident occurs, and the connecting portion is housed in a connection box provided on the ground.
[0003]
FIG. 4 is a diagram illustrating an example of a cable line having an E-branch connection. In FIG. 4, 1A to C, 2A to C, 3A to 3C are cable terminals, 4A to 4C are branch connection body bodies, 5A to 5C are branch connection boxes, 6 is a power supply side trunk cable, 7A to 7C are trunk cables, 8A to 8C are branch cables. Although FIG. 4 shows only one phase, actually, similar facilities exist for three phases.
[0004]
At station A, the cable terminals 1A, 2A, and 3A of the power supply-side trunk cable 6, the trunk cable 7A, and the branch cable 8A are integrally connected in a detachable manner so as to be inserted into the branch connector body 4A. . This connecting portion is called an “E-shaped branch connecting portion” because the shape when connected is an E-shape. The power supply side main cable 6 is started up from the branch connection box 5A, and is connected to the substation via an overhead line. The trunk cable 7A extends to an E-shaped branch connection provided at a point B between the next station. The branch cable 8A is connected to the premises of Station A via a transformer or the like. The connection is made in the same way at the connection between the point B and the station C.
[0005]
In such a cable line, for example, when construction is performed at station C, after disconnecting the power supply side trunk cable 6 from the power supply, the exposed conductor portion of the power supply side trunk cable 6 is grounded for safety. At the point, the work was performed after the cable terminal 2B of the trunk cable 7B was removed from the branch connector body 4B. By doing so, even if the power-side trunk cable 6 is erroneously connected to the power source during construction, the conductor of the power-side trunk cable 6 is grounded and the trunk cable 7B is disconnected. As the safety is doubled, construction at Station C can be performed safely. In the case of construction at C station, it is most desirable to perform grounding at the branch connection part of C station. However, at the branch connection part, since there is no place where conductors can be exposed, grounding cannot be performed at that place. Is the current situation.
[0006]
[Problems to be solved by the invention]
Under such circumstances, the point where the power-side trunk cable 6 is disconnected from the power source and the conductor grounding point of the power-side trunk cable 6 are far away from the construction site. It is possible that the line is removed and the power is turned on. Also, point B is far away from station C, so it is troublesome to go to point B and remove the trunk cable 7B from the branch connector body 4B when performing the work at station C. There is no small risk of starting. Under such circumstances, there is a problem that an electric shock accident may occur during construction.
[0007]
An object of the present invention is to solve such a problem and to enable a conductor to be directly grounded at a place where construction is performed, thereby reliably preventing an electric shock accident during construction.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a power cable branch connection part of the present invention is provided in the middle of a power cable line, and two main trunk cables and a branch cable are connected to a branch connector body by a male connector and a female connector. A power cable branch connection portion connected by fitting a connector to the branch connector body, wherein a connector of the branch connector body can be fitted between the branch connector body and the trunk cable or the branch cable. A first connector and a second connector that can be fitted with the connector of the trunk cable or the branch cable at both ends, and a third connector that connects a ground wire to an intermediate portion thereof; The present invention is characterized in that a conductor ground adapter is provided . With this configuration, the conductor can be directly grounded at the place where the construction is performed, and the electric shock accident during the construction can be reliably prevented. Furthermore , the branch connection body and the cable terminal can be used as they are conventionally, and even with the conductor grounding adapter attached, the entire body becomes compact and the branch connection box for storing them is also provided. In addition, the conventional one can be used as it is, and the cost can be minimized.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing an embodiment of the present invention. In FIG. 1, 1 to 3 are cable terminals, 4 is a branch connection body, 7 is a trunk cable, 8 is a branch cable, 9 is a power detection terminal cap, 10 is a conductor grounding adapter, and 11 is a cap. The conductor grounding adapter 10 and the cap 11 are shown with dots in order to distinguish them from other parts.
[0010]
This E-type branch connection part is provided in the middle of the power cable line as shown in FIG. 4, and two main trunk cables 7, 7 and the branch cable 8 are connected to the branch connection body 4 by a male connector. The female connector is connected to the female connector. A conductor ground adapter 10 that can connect a ground wire is provided between the cable terminal 1 of the trunk cable 7 and the branch connector body 4. Normally, a cap 11 is attached to the ground wire connection of the conductor ground adapter 10 to protect the connection and ensure safety. Such branch connection parts are arranged in parallel with the ground wire connection part covered with the cap 11 of the conductor ground adapter 10 for the three phases facing forward, and housed in the branch connection box.
[0011]
FIG. 2 is a partially cutaway view of a portion to which a conductor ground adapter is connected, and FIG. 3 is a sectional view of the conductor ground adapter. 2 and 3, 12 is an adapter center conductor, 13 is an insulating layer, 14 is an outer conductive layer, 15 is an inner conductive layer, 16 is a male connector, 17 is a female connector for cable connection, and 18 is Female connector for ground line connection, 19 to 21 are connection bolts for connecting male connector 16, female connectors 17 and 18 to adapter center conductor 12, 22 is female screw, and 23 is branch connection A body center conductor, 24 is an insulating layer, 25 is an external conductive layer, 26 is a female connector, 27 is a power detection terminal, 28 is a male connector of a cable, and 29 is a cable conductor connector.
[0012]
The male connector 16 of the conductor grounding adapter 10 is provided on the branch connector body 4 and is fitted and connected to a female connector 26 having the same structure and size as the female connectors 17 and 18. A male connector 28 having the same structure and size as the male connector 16 is inserted into the female connector 17 and is fitted and connected thereto.
[0013]
Then, when performing the work at the branch connection portion, the power supply-side main cable 6 in FIG. 4 was disconnected from the power supply, the cap 11 was removed, and the female connector 18 was attached to the tip of the ground wire. Connect the male connector. The male connector attached to the ground wire has the same structure and size as the male connectors 16 and 28. Then, a cylindrical member is provided so as to surround the outside of the male connector, and a male screw is formed on the outer periphery of the distal end thereof. The male screw is screwed into the female screw 22 to fix the ground wire. .
[0014]
In this way, grounding can be performed at the site during construction, so even if the power-supply-side trunk cable 6 is turned on by mistake, the ground relay operates immediately to shut off the power. The safety of people is ensured. Moreover, each connector of the conductor grounding adapter 10 has the same structure and size as those of the conventional branch connection body 4 and the connectors of the cable terminals 1, 2, and 3, and the conductor grounding adapter 10 is connected to the branch connection body main body. Since it is arranged between the cable terminal 4 and the cable terminal, the cable terminals 1 to 3 and the branch connection body 4 can be used as they are.
[0015]
When the door of the branch connection box is opened, the cap 11 of the conductor grounding adapter 10 is exposed to the front side. In addition, it becomes possible to perform a power application test by connecting a cable for the power application test to the female connector 18 for the ground wire of the conductor ground adapter 10. Further, a temporary branch cable can be connected using the female connector 18 for the ground wire.
[0016]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
That is, a power cable branch connection portion provided in the middle of a power cable line and connected to the main body of the branch connection body by connecting the front and rear two main cables and the branch cable by fitting the male connector and the female connector. A first connector that can be fitted with a connector of the branch connector body and a connector of the trunk cable or the branch cable between the branch connector body and the trunk cable or the branch cable. And a second connector that can be fitted to both ends, and a conductor ground adapter having a third connector for connecting a ground wire to an intermediate portion between them is provided. As a result , the conductor can be directly grounded at the place where the work is performed, and the electric shock accident during the work can be reliably prevented. Furthermore , the branch connection body and the cable terminal can be used as they are conventionally, and even with the conductor grounding adapter attached, the entire body becomes compact and the branch connection box for storing them is also provided. In addition, the conventional one can be used as it is, and the cost can be minimized.
[Brief description of the drawings]
FIG. 1 is a diagram showing one embodiment of the present invention.
FIG. 2 is a partially cutaway view of a portion to which a conductor grounding adapter is connected.
FIG. 3 is a sectional view of a conductor grounding adapter.
FIG. 4 is a diagram illustrating an example of a cable line having an E-branch connection portion.
[Explanation of symbols]
1-3 Cable terminal 4 Branch connection body 5 Branch connection box 6 Power supply side trunk cable 7 Trunk cable 8 Branch cable 9 Power detection terminal cap 10 Conductor grounding adapter 11 Cap 12 Adapter center conductor 13, 24 ... insulating layers 14, 25 ... outer conductive layer 15 ... inner conductive layer 16, 28 ... male connector 17, 18, 26 ... female connector 22 ... female screw 23 ... branch connector center conductor 27 ... inspection Terminal 29: Cable conductor connector

Claims (1)

A power cable branch connection portion provided in the middle of the power cable line and connected to the main body of the branch connection body by connecting two main and front trunk cables and a branch cable by fitting a male connector and a female connector. A first connector that can be fitted with a connector of the branch connector body and a connector of the main cable or branch cable are fitted between the branch connector body and the trunk cable or branch cable. A power cable branch connection , comprising: a conductor ground adapter having a second connector that can be connected at both ends and a third connector that connects a ground wire to an intermediate portion between them. Department.

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