JPH0545077Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The invention is a simple device that can separately discharge the insulating oil between the aluminum sheath and the cable core and the insulating oil between the conductor and the oil passage. Concerning the structure of the oil draining terminal of the core OF cable.

(Conventional technology) The oil draining terminal of the conventional single-core OF cable was
As shown in the figure, the exposed end of the conductor 2 of the single-core OF cable 1 is inserted into the conductor insertion hole 4 provided on one end side of the pulling eye main body 3, compressed from the outer periphery, and fixed. It has a structure in which lead work 6 is applied from the outer peripheral surface of the pulling eye body 3 to the end of the corrugated aluminum sheath 5 of the single-core OF cable 1. The other end of the pulling eye body 3 is provided with an oil passage 7 communicating with the conductor insertion hole 4 and a connector 8 for opening and closing the oil passage 7.

(Problem to be solved by the invention) However, when performing cable connection work on the low position side of a single-core OF cable line installed at a high head, the connector 8 at the tip of the oil-draining terminal of the single-core OF cable is When opened, first, a considerable amount of insulating oil spouts out from the central oil passage 9 of the cable conductor 2. As a result, the internal pressure of the oil passage 9 decreases rapidly, and the insulating paper of the cable core 10 wrinkles due to the pressure of the insulating oil filled between the cable core 10 and the corrugated aluminum sheath 5. There was a problem in that the insulation performance of the single-core OF cable 1 was significantly impaired.

Conventionally, to deal with this, before opening the connector 8, a hole was made in the corrugated aluminum sheath 5 to drain the insulating oil between the cable core 10 and the corrugated aluminum sheath 5, or a lead wire was used. Although methods such as cutting the cable 1 at the end of the cable 6 have been used, it is difficult to adjust the amount of oil discharged and it has not been possible to prevent the insulating paper from wrinkling.

Therefore, the present invention is an attempt to deal with such conventional circumstances, and is a single core that does not cause wrinkles in the insulating paper when draining insulating oil during cable connection.
The purpose is to provide an oil draining terminal part for OF cables.

[Structure of the invention] (Means for solving the problem) The oil removal terminal of the single-core OF cable of the invention is
At the end of the cable core, where the cable sheath and cable core are stripped in stages to expose the insulating layer and conductor, there is an insulating layer insertion hole in the center with approximately the same diameter as the outer diameter of the tip of the insulating layer of the cable core; A conductor insertion hole having a diameter substantially the same as the outer diameter of the conductor following the insulation layer insertion hole, and an oil passage communicating with the conductor insertion hole,
A flange including a cylindrical portion having a diameter larger than the outer diameter of the cable sheath is provided on the rear end side of the insulating layer insertion hole, and a first connector is attached to the end of the oil passage, and the first connector is attached to the end of the oil passage. A second connector is inserted into a pulling eye body formed by attaching a second connector to the end face of the flange, and the pulling eye body is compressed from above the insulating layer insertion hole and the conductor insertion hole to be fixed to the end of the cable core, It is characterized in that lead work is applied between the cylindrical part of the flange of the pulling eye main body and the cable sheath.

(Function) At the oil-draining end of the single-core OF cable of the present invention, the insulating oil in the oil passage in the cable conductor and the insulating oil in the space above the cable core are separated through their respective connectors while adjusting the amount of oil drained. Can be discharged.

Therefore, a large hydraulic pressure difference does not occur in the direction of the inner diameter of the cable, and wrinkles in the insulating paper of the cable core are prevented.

(Example) Hereinafter, an example of the present invention shown in the drawings will be described.

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

In the figure, the cable core end of the single-core OF cable 11 is shown by stripping off the cable sheath 12 and cable core 13 in stages to expose the insulation layer 14 and conductor 15, and further removing the tip of the insulation layer 14 in stages. is inserted into the pulling eye main body 16, and is compressed and fixed from the tip of the insulating layer 14 and the outer periphery of the conductor 15 by a conventional method.

The pulling eye main body 16 has a stepped cable core insertion hole 17 in the center into which the tip of the insulating layer 14 of the cable core 13 and the conductor 15 can be inserted, and an oil passage 18 that communicates with the cable core insertion hole 17. The flange 19 has a cylindrical portion on the rear end side, a first connector 20 is attached to the oil passage 18, and a second connector 21 is attached to the end face of the flange 19 having the cylindrical portion. This is what I wore.

A leadwork 22 is provided between the flange 19 having a cylindrical portion and the cable sheath 12, and a protective cover 23 is fitted over the compression portion of the pulling eye body 16.

A threaded groove 24 is provided on the outer peripheral surface of the distal end of the pulling eye main body 16, into which a well-known eye nut (not shown) is screwed.

In the oil-draining terminal part of the single-core OF cable configured in this way, when the connection is applied to a high-head cable connection, the first connector 20 on the tip side and the first connector 20 of the flange 19 having the cylindrical part are connected at the start of the connection. When the two connectors 21 are loosened together, the insulating oil in the oil passage 25 at the center of the cable conductor 15 passes through the first connector 20 on the tip side, and the insulating oil in the space above the cable core 13 passes through the flange with a cylindrical part. 2nd of 19
The oil is discharged through the connector 21 while adjusting the amount of discharged oil. After draining an appropriate amount of oil, connect the cable ends using the usual method.

In this way, no oil pressure difference occurs in the cable radial direction, and the occurrence of wrinkles in the insulating paper of the cable core 13 as described above is prevented.

[Effects of the invention] As explained above, according to the oil draining terminal of the single-core OF cable of the invention, the insulating oil in the oil passage in the cable conductor and the insulating oil in the space above the cable core can be adjusted separately. Since the structure allows oil to be drained while the cable is being connected, it is possible to prevent the insulating paper of the cable core from wrinkling when the insulating oil is drained during cable connection.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention; Fig. 2
The figure is a longitudinal sectional view showing a conventional example. 11... Single-core OF cable, 12... Cable sheath, 13... Cable core, 14... Insulating layer, 15... Conductor, 16... Pulling eye body, 17... Cable core insertion hole, 18... Oil Passage, 19... Flange with cylindrical portion, 20...
First connector, 21...Second connector, 22
...Leadworker.

Claims (1)

[Scope of utility model registration request] At the end of the cable core, where the cable sheath and cable core are stripped in stages to expose the insulating layer and conductor, there is an insulating layer insertion hole in the center with approximately the same diameter as the outer diameter of the tip of the insulating layer of the cable core; A conductor insertion hole that follows the insulation layer insertion hole and has approximately the same diameter as the outer diameter of the conductor, and an oil passage that communicates with the conductor insertion hole, and the outer diameter of the cable sheath is located on the rear end side of the insulation layer insertion hole. It has a flange having a cylindrical portion with a larger diameter, and further has a first connector attached to the end of the oil passage, and a second connector attached to the end face of the flange.
The connector is inserted into the pulling eye body formed by attaching the connector, and the pulling eye body is compressed from above the insulating layer insertion hole and the conductor insertion hole to be fixed to the end of the cable core, and the flange of the pulling eye body is An oil-draining terminal part of a single-core OF cable, characterized by having lead work applied between the cylindrical part and the cable sheath.