JPS5840887B2 - Structure of tension section in multi-conductor overhead power transmission line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to the structure of a tension section in a multi-conductor overhead power transmission line, and more specifically, to the structure of a tension section in a multi-conductor overhead power transmission line. At the retaining part,
Reliably prevents mechanical accidents that occur at the jumper socket of the upper power transmission line conductor or the intersection of the jumper conductor and the lower power transmission line conductor or its retaining connection rod, and problems such as loss of corona characteristics in the jumper wire section. The present invention relates to the structure of a tension section in a multi-conductor power transmission line that is capable of moving around.

In recent years, due to the increase in power transmission capacity due to the dramatic increase in power demand,
The current capacity per transmission line is increasing, and for this reason, multi-conductor overhead power transmission lines, which used to be an even number of up to 4 conductors, are being divided into 6 conductors and even an even number of 8 or more conductors. Plans are underway for a power transmission line to be constructed, and a six-conductor overhead transmission line is already under construction.

As is well known, such multi-conductor overhead power transmission lines are constructed by connecting an even number of adjacent element conductors to each other in order to prevent various electrical and mechanical problems such as corona discharge and sticking between each element conductor. The conductors are arranged and constructed so that the spacing is equal, that is, when viewed from the cross-sectional direction, each element conductor is placed at each vertex of a 7-regular polygon that equally divides one circumference. In this case, as a matter of course, the fallen elementary conductor located above and any elementary conductor located below are placed vertically on the same vertical line, so the resistance of each of these elementary conductors is In the tension retention section, the jumper socket or jumper element conductor connected to the transmission line element conductor located above cross-contacts with the transmission line element conductor located vertically below it or its retention connection rod such as its clevis link. A situation arises.

To prevent this, for example, as shown in Figure 1,
The distance between the jumper element conductors J1 and J2 electrically connected to the two transmission line element conductors C1 and C2 located at the top is narrowed inward at their jumper sockets S1 and S2. Two jumper bare conductors J1. J2 is pulled out through the inside of the transmission line element conductors C7 and C8 located at the bottom, and two jumper elements are similarly electrically connected to the transmission line element conductors C3 and C4 located at the middle upper part. The mutual spacing of conductors J3J4 is narrowed inwardly at their jumper sockets S3, 8.4 to connect these two jumper bare conductors J3. It is conceivable to prevent the above-mentioned cross-point contact by drawing out the power transmission line element conductors C5, C6 located at the middle lower part and the power transmission line element conductors C7, C8 located at the bottom, respectively. However, in general, the spacing between adjacent transmission line element conductors is 41
40crrL1 or 810 in case of 0m4AC8R
In the case of m4AcsR, it is about 50 crrL, so even if the above considerations are taken, each jumper element conductor J1 to J8 will not be mutually connected at the point where it passes through the lowermost transmission line element conductors C7 and C8. It is possible to maintain a spacing of at most ten centimeters between the jumper conductors, and as a result, the jumper conductors may become horizontally assembled due to wind pressure.
Alternatively, if there is a horizontal angle in the tension tower section of the line, the jumper bare conductors or the jumper bare conductors and the transmission line bare conductors, etc. can easily come into impact contact, leading to the risk of accidents such as mechanical damage. Not only that, the jumper bare conductor J1
~If the spacing near the end of J4 is changed, this will affect the overall shape of the jumper wire J, and the arrangement position of each jumper element conductor will deviate from the position of the apex of the predetermined regular polygon and collapse. Particularly in the case of a 6-conductor system, an 8-conductor system, etc. in which the power transmission voltage is extremely high, a problem arises in that the corona characteristics at the jumper wire portion deteriorate.

The purpose of this invention is to provide a structure for a tension-resistant part in a multi-conductor overhead power transmission line that advantageously solves the above-mentioned problems. An example of such a case will be described with reference to FIGS. 2 to 5. 1 is a tower arm, 2 is a yoke on the tower side, 3 is a tension insulator chain, and 4 is a yoke on the wire side. At the tip of the yoke 4, eight elementary conductors C1 to C8 constituting the power transmission line C are attached to a retaining clamp 5, respectively.
1 to 58.

In addition, as shown in FIG. 3, these elementary conductors C1 to C8 form one circle when viewed from the cross-sectional direction so that the intervals between adjacent elementary conductors are equal to each other. They are arranged at each vertex of a regular octagon that divides the circumference into eight equal parts.

An annular conductor 7 made of a material such as steel or aluminum is provided near the tensile tension fixing part of the power transmission line C so as to cover the entire outside of the eight power transmission line elementary conductors C1 to C8. The wire element conductors C1 to C8 and the annular conductor 7 are electrically connected by bond wires 8 and mechanically connected via rigid arms 9.

As the annular conductor 7, in addition to a cylindrical conductor as in this embodiment, a ring-shaped conductor may also be used.

The jumper wires J for electrically connecting the power transmission lines disassembled into left and right sides around the steel tower 1 (the power transmission line on the right side is not shown) are made of eight jumper bare wires J1, similar to the power transmission line C. ~J8, and as shown in FIG. 5, when viewed from the cross-sectional direction so that the spacing between adjacent elementary conductors J1-J8 is equal to each other, each elemental conductor J1-J
8 is arranged at each vertex of a regular octagon that divides one circle into eight equal parts.

In this embodiment, in order to maintain the overall shape of the jumper wire J in this arrangement, every other elementary conductor, for example, four elementary conductors J1, J4, . J5. J8 are connected by a four-conductor spacer 10A at a certain position in the length direction, and the remaining four element conductors J2 are connected at other positions in the length direction.
．． J3. J6゜J7 are connected by a 4-conductor spacer 10B, and as a whole, each jumper element conductor J1 to J8 is a positive 8
An array is maintained at each vertex of the rectangle.

Note that the number of divided elementary conductors of the jumper wire J does not necessarily have to be the same as that of the power transmission line C, and the number of divided elementary conductors may be changed as appropriate within a range that does not impede its corona characteristics.

The ends of each jumper conductor J1 to J8 are fixed sleeves 11
It is electrically connected and fixed to the peripheral wall surface of the annular conductor 7.

According to the present invention configured as described above, a plurality of elementary conductors constituting a multi-conductor power transmission line are formed into regular polygons that equally divide one circumference so that the spacing between adjacent elementary conductors is equal. The cable conductors are held and fixed to the tower arm while being arranged at each apex position, and the outside of the cable conductor near the fixing part is covered with an annular conductor, and the annular conductor and each element are Since it is made by connecting and fixing the ends of multiple jumper bare conductors that electrically connect the conductor and the left and right power transmission lines to the peripheral wall surface of the annular conductor, it is no longer possible to There is no risk that the jumper socket or jumper element conductor of the transmission line element conductor located above will cross-contact with the transmission line element conductor or retaining connection rod located below, and therefore the transmission line element conductor or It is possible to reliably prevent mechanical damage accidents to the jumper bare conductors, etc., and the end of each jumper bare conductor is not directly connected to the suspension clamp part of the power transmission line. Since the mounting is fixed to the surrounding wall surface, the fixing position can be set at any position on the surrounding wall surface of the annular conductor. Even if there is a corner, the entire jumper wire can be easily shaped into a predetermined shape, that is, each jumper conductor can be easily shaped into a predetermined shape without introducing stresses that cause mechanical damage such as excessive twisting or bending moments in each jumper conductor. It is possible to maintain the arrangement and construction at each vertex of a regular polygon without impairing the corona characteristics.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram for explaining the relationship between the vicinity of the retaining end of the elementary conductor of the power transmission line and the vicinity of the pull-out end of the jumper wire;
The figure is a schematic side view showing -PI when this invention is implemented in an 8-conductor type overhead power transmission line, and Figure 3 is a
4 is a schematic cross-sectional view taken along the line IV--IV in FIG. 2, and FIG. 5 is a schematic cross-sectional view taken along the line ■--■ in FIG. 1... Steel tower arm, 2... Tower side yoke, 3... Tensile insulator chain, 4... Wire side yoke, 51, 58... 0 clamp, 7...
- Annular body, 8... Bond wire, 9... Rigid arm, 10A, 10B... Spacer, 11...
・Fixing sleeve, C・・・Power transmission line, C1 to C8
......Power transmission line bare conductor, J...Jumper wire, J1-J8...Jumper bare conductor.

Claims (1)

[Claims] 1. Each elementary conductor C1 to Cn constituting the multi-conductor power transmission line C is connected to the yoke 4 which is tensilely connected to the steel tower arm 1 via the tensile insulator chain 3 at a plurality of equal dividing points on one circumference. The arrayed state is maintained and the conductors are held and fixed, and the outer side of each elementary conductor CI-Cn in the vicinity of the above-mentioned holding and fixing is connected to an annular conductor 7.
and cover the annular conductor I and each elementary conductor C.
A plurality of jumper element conductors J1 to Jm that constitute a jumper wire J that electrically connects 1 to Cn and mutually electrically connects left and right power transmission lines C around the steel tower to each of the above-mentioned element conductors. Similarly to C1 to Cn, each jumper element conductor 4, to J
A structure of a tension-resistant part in a multi-conductor overhead power transmission line, characterized in that the end portion of the annular conductor 7 is connected and fixed to the peripheral wall surface of the annular conductor 7.