JPS58351Y2 - Jumper device for multi-conductor transmission lines - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a jumper device in which jumper wires of a multi-conductor power transmission line are twisted together into a rope.

Conventionally, overhead power transmission lines have been constructed using tension towers every few towers due to bends and land constraints.

The power transmission lines in this tension tower are held down via detention clamps, and the detention clamps on both sides of the tower are connected by flexible twisted wires called jumper wires.

This flexible stranded wire is a stranded wire with approximately the same current carrying capacity as a power transmission line, and has a large clearance between it and the tower arm to prevent ground faults even if it sways due to wind pressure. .

On the other hand, multi-conductor transmission lines are being used due to ultra-high transmission voltages and increases in power transmission capacity, and in tension towers, tie-down and jumper wires are used for each conductor.

Like the power transmission lines, these jumper wires are also held at constant intervals by inserting spacers.

For this reason, the dimensions of the tower arm are increased in order to provide sufficient clearance between the tower arm and the jumper wire.
The cost of constructing a steel tower is therefore uneconomical.

Therefore, a jumper device was proposed in which the intermediate portions of the jumper wires for each conductor were tied together and a rigid member such as an aluminum pipe was attached to reduce the spacing and slack between the jumper wires, thereby reducing the clearance of the jumper wires. However, the use of rigid members and their support were troublesome.

In view of this, the present invention reduces the clearance between the jumper wire and the tower arm without using any new components.
Intermediate the jumper wires for each conductor of a multi-conductor transmission line,
It is characterized by being twisted into rope twists.

Next, this will be explained in more detail based on the drawings.

The drawing shows an example of a jumper device according to the present invention for a four-conductor power transmission line, in which each conductor 1 of the four-conductor power transmission line is held down via a detention clamp 2, and a jumper wire is connected from the jumper terminal 3 of each detention clamp 2. 4 is pulled out and connected to the jumper terminal (not shown) of the other side retaining clamp to form a jumper device, which is the same as the conventional one, but in the present invention, it is pulled out from the jumper terminal 3. The jumper wires 4 are twisted together in the middle to form a twisted wire 5.

As a result, the middle part, which is the main part of the jumper wire, is made up of rope-twisted wires 5 with the jumper wire 4 as the bare wire.
Compared to the conventional structure in which jumper wires 4 are constructed by inserting spacers one by one, the mechanical strength and rigidity of the jumper wires are large, and the distance between the jumper wires is small, so the clearance with the tower arm is also small. However, the economic benefits of making the tower arm smaller and lighter are enormous.

Furthermore, since each strand of the jumper wire 4 can be attached to the jumper terminal 3 at both ends of the jumper wire, there is an advantage that the jumper wire 4 can be attached in exactly the same way as the conventional case where the jumper wire 4 is attached to each conductor 1.

It should be noted that although the above-mentioned embodiment has been described for a four-conductor power transmission line, it goes without saying that 4. can also be applied to multi-conductor power transmission lines such as two conductors, six conductors, etc. in the same manner. do not have.

As explained above, according to the present invention, the intermediate portions of jumper wires inserted in each conductor of a multi-conductor power transmission line are twisted together by rope twisting (-7 stranded wires) using jumper wires as strands. Compared to the conventional structure in which jumper wires are installed one by one with spacers inserted, the mechanical strength is greater, and the clearance with the tower art can be reduced, making the tower arm smaller and lighter. Only the middle part of the jumper wire is a rope-stranded wire, and each jumper wire can be easily attached to the jumper terminal of each conductor without using any reinforcing materials at both ends.A jumper device for multi-conductor power transmission lines. It is suitable as

In the present invention, the jumper wires are twisted together without intervening spacers, but wear of each jumper wire can be avoided for the following reason.

Multi-conductor (consisting of two or more elementary conductors (wires).

), since the elementary conductors are installed at a predetermined interval, a spacer is interposed between the elementary conductors in order to maintain the interval.

In other words, if this spacer is not installed, each elementary conductor may automatically move against pressed stones due to strong winds, etc. (
There is a lot of lateral vibration, especially in the center of the span.

), when the span length where the elementary conductors contact each other and cause entanglement in some cases is several looms, the distance between the elementary conductors is 40-60 cIrL, and in the case of lateral vibration, the left and right -
If the runout is misaligned, they may become entangled with each other.

In addition, the jumper wire is 500 K, V class, and the length is 15 to 2.
0772, and the amount of lateral runout is small, but the spacing between the elementary conductors is similarly 40 to 60 CwI, and they may become entangled.

), causing electrical and mechanical instability and danger to power transmission lines, causing serious accidents.

This occurs because each elemental conductor is installed separately rather than integrally; in this invention, the elemental conductors are twisted together, so problems such as entanglement can be avoided without providing a spacer. be able to.

In addition, in the present invention, the jumper wires 4 constituting the stranded wires 5 are electric wires (stranded wires) used in ordinary power transmission lines, and the method of twisting the jumper wires is the rope twisting method performed with ordinary wire rope etc. Because of the similar stranding, wear between each jumper wire, if it occurs, will depend on the method of use,
Since the manufacturing method and materials are the same as ordinary electric wires, they are extremely small and can be ignored like these ordinary electric wires.

[Brief explanation of the drawing]

The drawing is an explanatory diagram showing an example of a main part of a jumper device for a multi-conductor power transmission line according to the present invention. 1... Conductor, 2... Detention clamp, 4
...Jumper wire, 5...Twisted wire〇

Claims (1)

[Scope of utility model registration request] A jumper device for a multi-conductor power transmission line in which each conductor of a multi-conductor power transmission line is held down and a jumper wire is inserted, the jumper for a multi-conductor power transmission line being characterized in that the jumper wires of each conductor are twisted together in the middle to form a rope. Device.