JP2002354647A - Aerial transmission line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide, in an aerial transmission line connecting the aerial trans mission cable to a steel tower using an insulator string, a slack adjusting device, and an anchoring clamp wherein the aerial transmission cables on each side of the steel tower are connected with a jumper cable, an aerial transmission line where the slackness of the jumper cable is always kept roughly constant, the spacing between aerial transmission cables wired above and below is mini mized, and the steel tower may be made short and compact. SOLUTION: In an aerial transmission line connecting the aerial transmission cable to a steel tower using an insulator string, a slack adjusting device, and an anchoring clamp wherein the aerial transmission cables on each side of the steel tower are connected with a jumper cable, this invention is characterized by suspending and supporting the central part of the jumper cable on a polymer insulator attached to the steel tower.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead transmission line connected to a steel tower by means of an insulator string, a sag adjusting device, and a retaining clamp, and the overhead transmission lines wired with the steel tower interposed therebetween by jumper wires. It relates to an overhead transmission line.

[0002]

2. Description of the Related Art An overhead power transmission line is used for power transmission to the overhead power transmission line,
The temperature may rise due to a change in conditions such as the surrounding environment accompanying the rise in temperature, and the temperature may increase, causing the sag to exceed an allowable range. Therefore, as a countermeasure, a sag adjusting device for suppressing the length of the overhead transmission line has been proposed (Japanese Utility Model Laid-Open No. 58-162728). However, in this proposal, as shown in FIG. 3, when the sag adjusting device 15 is operated and the overhead transmission line is drawn in the direction of the tower in order to adjust the sag of the overhead transmission line, the jumper wire 18 is also drawn accordingly. As shown by the dotted line in the figure, the sag of the jumper wire 18 increases, and the gap between the jumper wire 18 and the tower arm (not shown) that supports the overhead transmission line of the wiring decreases, causing a short circuit accident. The danger of causing it was pointed out.

[0003] In response to the above proposal, a proposal has been made to take measures against the loosening of the jumper wire by the looseness adjusting device (Japanese Patent Publication No. 4-4 / 1994).
No. 0814). As shown in FIG. 4, a proposal for taking measures against the sag of the jumper wire is shown in FIG.
2. Conductor sag adjusting device 15 and retaining clamp 17 are connected in series to hold transmission line 13 to steel tower 14, and jumper wire 18 connected to retaining clamp 17 is connected between insulator string 12 and conductor sag adjusting device 15 at one end. It is configured to be fixed to the connecting metal fitting 11 provided therebetween and connected to the other transmission line.

[0004]

However, in such a configuration, the operation of the conductor sag adjusting device 15 with respect to the elongation of the overhead transmission line 13 is taken into consideration, but the slack with respect to the elongation of the jumper wire 18 is taken into consideration. Therefore, in a tower in which a plurality of overhead power transmission lines 13 are laid up and down, the interval between the upper and lower portions must be long in consideration of the elongation of the jumper line 18, that is, the interval must be long. There was a drawback that the tower was high and large.

In order to solve such a drawback, the sag of a jumper wire is always kept substantially constant, the interval between overhead power transmission lines laid between the upper and lower parts is minimized, and the overhead tower can be made smaller and smaller. There is a need for transmission line development.

The present invention satisfies such a demand, and connects an overhead power transmission line to a steel tower with an insulator string, a sag adjusting device, and a retention clamp, and connects a jumper wire between the overhead power transmission lines wired with the steel tower interposed therebetween. It is an object of the present invention to provide an overhead power transmission line connected to an overhead power transmission line in which the length of the jumper wire is the same as that of the conventional one and there is no possibility of generating heat or the like as a result of a closed circuit.

[0007]

That is, according to the present invention, an overhead power transmission line is connected to a steel tower by means of an insulator string, a sag adjusting device, and a retention clamp, and a jumper wire is provided between the overhead power transmission lines wired with the steel tower interposed therebetween. In the overhead transmission line connected by the above, an intermediate portion of the jumper line is suspended and supported by a polymer insulator attached to a steel tower.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An overhead transmission line according to the present invention will be described below with reference to an embodiment shown in FIG. 1 is a steel tower,
An insulator series 2 and a retaining clamp 4 are attached in series to the tower arms 8 of the tower 1, respectively, and a transmission line 5 and a jumper wire 6 are connected to the retaining clamp 4. Reference numeral 3 denotes a sag adjusting device inserted between the insulator string 2 and the anchoring clamp 4, and the sag adjusting device 3 is inserted into only one of the lines in the embodiment shown in the drawing to absorb the slack of the overhead power transmission line 5. Has been installed. In some cases, sag adjustment devices are provided at both ends of the transmission line. Reference numeral 7 denotes a polymer insulator having excellent insulating properties and flexibility. One end of the polymer insulator 7 is
And the other end is attached to an intermediate portion of the jumper wire 6.

In the overhead transmission line of the present invention thus configured, the transmission line 5 is elongated due to a temperature rise due to power transmission or the like, and the sag adjustment device 3 is operated (the sag adjustment device is contracted) to make the jumper wire. Even if the sag of the jumper wire 6 becomes large, the middle portion of the jumper wire 6 is suspended by the polymer insulator 7, and the lowermost position of the jumper wire 6 is maintained by the polymer insulator 7 as shown in FIG. The lower end of the jumper wire 6 is not loosened, and the lowermost end is not lowered to approach the tower arm (not shown) supporting the lower transmission line.

Further, since the jumper wire 6 is connected to the steel tower 1 by a flexible polymer insulator 7, as shown in FIG.
When the temperature environment is different in the transmission line and the transmission line 5 is stretched, the looseness of the jumper wire 6 becomes unbalanced on the left and right, and the support point of the polymer insulator moves to either side.
The flexibility of the polymer insulator 7 does not cause a strain on the jumper wire 6 or the polymer insulator, and may cause an accident such as a break in the wire of the jumper wire 6 at a fixing point with the polymer insulator 7 supporting the jumper wire 6. There is no.

Further, the polymer insulator 7 is an insulator, and does not constitute a closed circuit with the jumper wire 6 and does not cause problems such as heat generation.

[0012]

According to the overhead power transmission line of the present invention, the overhead power transmission line 5 is connected to the steel tower 1 by the insulator string 2, the sag adjusting device 3 and the retaining clamp 4.
And the overhead transmission lines 5, 5
In the overhead power transmission line connected between the jumper wires 6, the middle portion of the jumper wire 6 is suspended and supported by the flexible polymer insulator 7 attached to the steel tower 1. Regardless of the amount of slack in the wire 6, the lower end position is maintained substantially constant, and there is no danger that the jumper wire 6 will excessively approach the tower arm located below the jumper wire 6 and cause a short circuit accident. ,
Since the interval between overhead transmission lines wired up and down can be set to a minimum, the tower 1 can be made small and small, and the construction cost of the overhead transmission line can be reduced. Further, even if the fixed support point between the jumper wire 6 and the polymer insulator 7 moves left and right, no excessive strain is applied to the jumper wire 6 and the polymer insulator 7, and the fixed support point between the jumper wire 6 and the polymer insulator 7 Unreasonable distortion is not applied, jumper wire 6 and polymer insulator 7
There is no danger of causing an accident such as a broken wire at the fixed point.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of an overhead transmission line according to the present invention.

FIG. 2 is an explanatory diagram showing one embodiment when the overhead power transmission line of the present invention is used.

FIG. 3 is an explanatory view showing a conventional overhead transmission line.

FIG. 4 is an explanatory diagram showing a mounting structure of a jumper wire in a conventional overhead power transmission line.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 steel tower 2 insulator series 3 sag adjustment device 4 retention clamp 5 transmission line 6 jumper wire 7 polymer insulator

Claims (1)

[Claims] An overhead transmission line comprising: an overhead power transmission line connected to a steel tower by an insulator string, a sag adjusting device, and an anchoring clamp, and the overhead transmission lines wired with the steel tower interposed therebetween by a jumper wire; An overhead transmission line, wherein an intermediate portion of the jumper line is suspended and supported by a polymer insulator attached to a steel tower.