JPS633531B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating a lower end of a single-core OF cable extended on a slope.

Hydraulic pressure based on the height difference of the slope acts on the low end of the OF cable extended on the slope.

Conventionally, in order to connect a single-core OF cable, a hollow conductor is opened, the hollow conductor is compressed and connected with a conductor connecting sleeve, and then a small cloth oil is inserted between the conductor connecting sleeve and the cable insulation layer at each cable end. The valleys were filled by wrapping soaked paper, and furthermore, an insulation reinforcing layer was formed, and lead work was carried out on the jacket connecting pipe.

However, when connecting the low end of a single-core OF cable extended on a slope with a large difference in height, it is difficult to connect the conductor connection sleeve to the end of the hollow conductor using the conventional method described above. Due to the high oil pressure due to the height difference between cables, leakage of a large amount of cable insulation oil cannot be avoided.

In order to eliminate this large amount of insulating oil leakage, if the oil passage of the conductor connection sleeve is temporarily blocked, the high hydraulic pressure due to the height difference of the slope will continue to act on the hollow conductor end at the low place, and the conductor connection will be interrupted. In the conductor between the sleeve and the end of the cable insulation layer, insulating oil noticeably spouts out from the gaps between the strands, making valley filling work extremely difficult.

The method of treating the low end of a single-core OF cable laid on a slope according to the present invention is a method that can avoid the above-mentioned large amount of insulating oil leakage, and can also easily perform valley filling treatment. A hollow conductor is brought out at the lower end of the core OF cable, and a conductor connector having an oil passage and a socket for opening and closing the oil passage is connected to the lead-out conductor, and then,
This method is characterized by filling the gap between the conductor connector and the cable insulating layer by winding insulating paper while causing the cable insulating oil to flow out from the conductor connector in appropriate amounts by adjusting the above-mentioned tip.

The present invention will be explained below with reference to the drawings.

In FIG. 1, A is an inclined conduit or tunnel, into which a single-core OF cable B is extended.

According to the present invention, in order to process the low end end E of the single-core OF cable B, first, a hollow conductor is led out from the end, and as shown in FIG. is inserted, and the conductor connector 3a or 3b is compressed and connected. These conductor connectors 3
a, 3b have an oil passage 31, and are equipped with a pot 32 for opening and closing the oil passage 31. One conductor connector 3a is a female type, and the other conductor connector 3b is a male type, and the male conductor connector 3b has an insert portion 30 inserted into the female conductor connector 3a. is provided. Concave and convex teeth 301 are carved on the outer surface of this insert portion 30 .

After the conductor connectors are compressed and connected to the respective hollow conductors as described above, the plugs 32 of the conductor connectors 3a and 3b are kept in a half-open state, and the oil passages 31 of the conductor connectors 3a and 3b are connected to each other. While draining the cable insulating oil in appropriate amounts, connect the conductor connectors 3a,
3b and the cable insulation layer ends 4a, 4 of the cable terminals.
Fill in the valley between b and b by winding a thin oil-impregnated paper 5.

The above work is carried out with the cable end raised upwards as shown in Fig. 3. In this state, the insulating oil level at the oil passage openings of the conductor connectors 3a and 3b is at the third level. As shown by m in the figure, it does not spread deep into the oil passage, and air can be reliably prevented from penetrating.

In the above, high oil pressure acts inside the hollow conductor 1 due to the difference in height of the cable, but the high oil pressure is not increased due to the leakage of an appropriate amount of cable insulating oil from the conductor connectors 3a and 3b. It is sufficiently relaxed, and the spouting of insulating oil from the exposed hollow conductor 10 through the conductor strand gap at the location where the valley filling process is to be performed can be suppressed to a small extent. Therefore, the valley filling work can be easily performed.

After performing the valley filling process on each cable terminal as described above, peel off the cable sheath 6 by a predetermined length from each cable terminal, return both cable ends horizontally, and connect the male conductor connector 3b. A compression connection is made with the female conductor connector 3a.

After the compression connection of the conductor connectors 3a, 3b, the plugs 32 of each conductor connector 3a, 3b are fully opened, and then the formation of the insulation reinforcing layer, the lead connection of the jacket connection pipe, etc. are carried out as usual. and complete the OF cable connection.

Note that it is desirable to cut out the protruding portions of the tips 32 on the conductor connectors 3a and 3b and smooth the outer surface of the conductor connectors.

The method for processing the low end of a single-core OF cable laid on a slope according to the present invention is the method described above, in which a conductor connector with a handle is compressed and connected to the outlet conductor, and an appropriate amount of cable is removed by operating the handle. Since the valley filling process is performed while the insulating oil flows out, even if the cable height difference is large, the spouting of the cable insulating oil from the conductor location where the valley filling process should be performed can be sufficiently suppressed, making the valley filling process easy. It can be carried out. In addition, since the leakage of insulating oil is suppressed by the lock, the amount of insulating oil flowing out can also be reduced, reducing insulating oil loss.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a single-core OF cable extended on a slope, Fig. 2 is an explanatory diagram showing the terminal of a single-core OF cable processed according to the present invention, and Fig. 3 is an explanatory diagram showing the operation in the present invention. It is an explanatory diagram for showing a state. In the figure, 1 is a hollow conductor with an opening, 3a and 3b are conductor connectors, 31 and 32 are oil passages and sockets of the conductor connectors, 4a and 4b are cable insulation layer ends, and 5 is a small width oil-impregnated paper for filling the valleys. be.

Claims (1)

[Claims] 1. A hollow conductor is opened at the low end of a single-core OF cable extended on a slope, and a conductor connector having an oil passage and a socket for opening and closing the oil passage is connected to the above-mentioned lead conductor, and then , a single-core OF for laying on a slope, characterized in that the gap between the conductor connector and the cable insulating layer is filled by winding insulating paper while the cable insulating oil flows out from the conductor connector in an appropriate amount by adjusting the above-mentioned tip. How to treat the low end of the cable.