JPS59160914A - Load sensing wire-filled power cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a tortoise cable with a load sensing wire that can immediately alert when a directly buried power cable is accidentally damaged in civil engineering work. be.

[Prior art and problems]

If civil engineering work is carried out where power cables are directly buried, there is a risk of accidental damage to the power cables. Therefore, this damage is usually discovered after the cable has been damaged, as was the case here.

[Structure of the invention]

The present invention has been made in order to solve the above-mentioned problems, and provides a daruma-type cable with load sensing wires that constitutes a system that can detect damage to the cable in advance and investigate the damage point.

The present invention will be explained based on the drawings.

Figure 1 shows an electric power cable 2 buried directly under the ground 1 with a load sensing line 3 placed directly above it. When the load sensing line is hit, the sensing line undergoes deformation as shown at 3 before the power cable 2 is traumatized. This allows damage to the cable to be detected before it occurs.

To explain the sensing principle by showing examples of the structure of the sensing wire in Fig. 3 (a) and Fig. 4 (a), in both figures, 11 in i is the center conductor;
12 is an outer conductor, 13 is a conductor, 14 is an insulating string, and 15 is a sheath. In addition, various measures are taken such as applying a pressure tape on the assembly of the conductor and the insulating string and applying a watertight compound to the gap mj.

Changes when the sensing wire shown in Figure 3 (A) receives a load are as shown in Figure 3 (B). By receiving the load indicated by the arrow, the arrangement of the conductors and insulating strings changes, and the center conductor 10 and the outer conductor 11 are in contact with each other. If a voltage is applied to both of them as shown in FIG. 3(A), when a load is applied, the load sensing device 20 can detect damage to the sensing wire by the above-mentioned contact.

The same applies to the cases shown in FIGS. 4(a) and 4(b).

In order for the above to be carried out smoothly, it is preferable that the sensing wire and the power cable be integrated rather than being separated, so the power cable with the load sensing wire of the present invention is As shown in Fig. 5, a load sensing line 3 is disposed directly above the electric cable 1, and a sheath 30 is applied to the two as a single unit with a cross section of a daruma shape, and this is directly buried under the ground 1.

〔Effect of the invention〕

The effects of the present invention are as follows: (1) Since the sensing wire is activated by receiving trauma before the power cable, accidents caused by damage to the cable can be prevented.

(2) Since the sensing line can also detect the position, the location of trauma can be immediately detected.

etc.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a load sensing line placed directly above the power cable and buried directly underground, and Fig. 2 is an explanatory diagram of the load sensing line in Fig. 1 deformed by being subjected to a load with a shovel. The third sentence and Figure 4 are both explanatory diagrams of the load 1 intoxication line, (
A) is a normal state, and (b) is an explanatory diagram of a state in which the arrangement has changed. (Note that (A) also serves as an explanatory diagram of the flow of current when the J body comes into contact with it.) FIG. DESCRIPTION OF SYMBOLS 1... Ground, 2... Electric cable, 3... Load sensing line, 3... Sensing line deformed under load, 4... Scoop, 11... Center conductor, 12... outer conductor, 1
3... Conductor, 14... Insulating string, 15... Sheath, 20... Load sensing device, 30... Daruma type sheath.

Claims (1)

[Claims] 1. A load sensing wire in which a sheathed load sensing wire is placed on a conductor separated by an insulating string, and the wire is located directly above the power cable, and both are sheathed together to have a Daruma-shaped cross section. Electric cable with wire. 2. The electrical cable with a load sensing wire according to claim 1, wherein the load sensing wire has a structure in which the arrangement of the insulating string and the conductor changes when subjected to a load, and the conductors come into contact with each other.