JPH038021Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a jumper device that electrically connects the main lines on both sides of a steel tower in an overhead power transmission line to each other, and in particular, a jumper device that is equipped with a jumper rod to which a dummy rod is attached and fixed. It is what it is.

[Prior art]

As shown in FIG. 4, when electrically connecting the power transmission line main lines 3 on both sides of the tower 1, which are tension-supported via the tension insulator link 2, to each other, the tension insulator link 2 and the main line 3 are connected electrically. Hanging rods 5 are connected to the metal fittings 4 in between, and jumper rods 6 made of aluminum pipes or the like are supported by the hanging rods 5, and both ends of the jumper rods 6 and the left and right main wires 3 are connected via connecting conductors 7 made of twisted wires. A jumper device is commonly used that connects the In addition, in the case of large-capacity power transmission, the jumper rod 6 is inevitably long and heavy, so for convenience in packaging and transportation, a plurality of split rods, for example two split rods 6a, are used as shown in the figure. It is also possible to connect them (the connection part is shown by 8) to make an assembled jumper rod. In order to reduce the potential gradient near the jumper rod 6 and improve corona discharge characteristics, a dummy rod 9 such as a steel pipe is attached and fixed to the jumper rod 6 using a spacer 10. Since the conventional dummy rod 9 is also used as a reinforcing member, a single piece that is almost the entire length of the jumper rod 6 is used. Therefore, the dummy rod 9 is long and heavy. In particular, those using steel pipes are particularly heavy, and therefore are not easy to handle in terms of packaging and transportation.

In view of the above-mentioned problems, the purpose of this invention is to provide a dummy rod with the ability to strengthen the connecting portion of an assembled jumper rod and to facilitate handling in terms of packaging and transportation.

[Means for solving problems]

In the present invention, in order to solve the above problems, a plurality of short dummy rods arranged in series are attached and fixed to an assembled jumper rod in which a plurality of split rods are connected in series, and the split rods are connected in series. At the portion facing the mutual connection portion, the intermediate portion in the length direction of the short dummy rod was made to straddle both sides of the connection portion.

[Effect]

The short dummy rods that extend over both sides of the joint between the divided rods of the jumper rod serve to reinforce the joint.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The main line 13 of the power transmission line is tensile supported on the steel tower 11 via the tension insulator link 12, and the tension insulator link 12 and the main line 1
Both ends of the jumper rod 16 are supported by suspension rods 15 connected to a metal fitting 14 such as a yoke between the main line 13 and the jumper rod 1.
6 is connected by a connecting conductor 17 made of twisted wire.

The jumper rod 16 is an assembly type jumper rod made by connecting, for example, two short divided rods 16a made of aluminum pipes or the like in series (the connection portion is shown as 18). In the embodiment, the two jumper rods 16 are connected in parallel. It is set up in

At a slightly lower position between the two jumper rods 16, three short dummy rods 19 made of, for example, steel pipes are arranged in series.
These short dummy rods 19 are attached and fixed to the jumper rod 16 by spacers 20. The details are explained using Figure 3.
A bracket 21 welded and fixed to a short dummy rod 19 is bolted to the lower center of the spacer body 20b, which holds the left and right jumper rods 16 at a predetermined interval by the clamp portions 20a at both ends.

In particular, the short dummy rod 19 located in the middle part in the line direction is arranged to straddle both sides of the connection part 18 between the divided rods 16a of the jumper rod 16, and is attached to the divided rods 16a on both sides, respectively. It is fixed via a spacer 21.

The plurality of short dummy rods 19 attached and fixed to the jumper rod 16 as described above alleviate the concentration of the electric field near the jumper rod 16 and reduce the potential gradient. Short rod 19 for each dummy
are not connected to each other and are separated, but as long as the distance between them is small, it does not reduce the effect of electric field concentration relaxation. In order to avoid increasing the potential gradient, it is preferable that the end of each short dummy rod 19 be curved.

During construction, each split rod 16a, short dummy rod 19, spacer 20, and other members for the jumper device are packed and transported to the construction site, where they are assembled in the state shown in FIGS. 1 to 3. However, as mentioned above, since the short dummy rod 19 is short and lightweight, it is easy to handle in packaging and transportation, and it is also easy to install.

The intermediate short dummy rods 19 are fixed to the split rods 16a on both sides, straddling both sides of the interconnection section 18 of the split rods 16a.
It also has the function of reinforcing the connecting portion 18.

Note that the example is a jumper rod 16 in which two split rods 16a are connected, and there is only one connection part 18;
When a plurality of connecting portions 18 are formed by connecting the connecting portions 18, the middle portion of the short dummy rod 19 is made to straddle the split rods 16a on both sides of the connecting portion 18 at the portion facing each connecting portion 18.

Further, although the embodiment includes two jumper rods 16, it goes without saying that one or three or more jumper rods may be used.

Furthermore, the short dummy rod 19 is not limited to being placed below the jumper rod 16, but may be placed above it.

〔effect〕

As explained above, according to the present invention, in a jumper device equipped with an assembled jumper rod formed by connecting a plurality of split rods in series, a dummy rod attached to the jumper rod to reduce the potential gradient can be connected in series. Each short dummy rod is divided into multiple rods in the same direction and fixed to the jumper rod, and at the part facing the connecting part between the divided rods, the intermediate part in the length direction of the short dummy rod is on both sides of the connecting part. Since the connecting part where the rigidity is weakened is appropriately reinforced by the short dummy rod, the short dummy rod can be easily packed and handled during transportation, and it is also easy to install. Workability is also improved.

[Brief explanation of drawings]

Fig. 1 is a side view showing one embodiment of the jumper device of the present invention, Fig. 2 is a plan view of the jumper rod portion of Fig. 1, Fig. 3 is an enlarged sectional view taken along the line - - in Fig. 2, and Fig. 4 is a side view showing an embodiment of the jumper device of the present invention. FIG. 2 is a side view showing a conventional jumper device. 16... Jumper rod, 16a... Split rod, 18... Connection portion, 19... Short rod for dummy, 20... Spacer.

Claims (1)

[Scope of utility model registration request] In an overhead power transmission line jumper device equipped with an assembled jumper rod 16 formed by connecting a plurality of split rods 16a in series, a plurality of short dummy rods 19 arranged in series are attached and fixed to the jumper rod 16. and the short dummy rod 19 is arranged such that the intermediate portion in the length direction thereof straddles both sides of the connecting portion 18 at the portion facing the connecting portion 18 between the divided rods 16a. An overhead power transmission line jumper device featuring: