RU1382347C - Aerial transmission line - Google Patents

Abstract

The invention relates to electrical engineering and can be used in ezodizdimi power transmission lines (VL) Circuit - improving the reliability of BL. An overhead power transmission line contains a pole or phase splitting suspended on intermediate supports 9 and 10. In each span between; at the supports 9 and 10, there are mowed struts 11 and paired struts 12. dividing the span into sub-spans I and I The first from the supports sublopetes 1 are shortened. Paired paatopv.ii 12 in every second span from supports 9 and 10 are placed in the gtis of the first from the support of the concentrated rosette 11. The distance between the first group of paired struts and the first from each spore is a concentrated strut. The goal is achieved by arranging the riapfibix and the concentrated struts by more effective limitation of the oscillations of the wire 9 sludge caused by the meter.

Description

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The invention relates to electrical engineering, mainly to overhead power lines (OHL).

An object of the invention is to increase reliability by more effectively limiting wind-induced oscillations of wires.

In FIG. Figure 1 shows the arrangement of spacers in a single-phase or single-pole OHL with eight wires in phase; in FIG. 2-4 - sections aa, bb and bb in FIG. 1; in FIG. 5 is a diagram of the arrangement of spacers in a single-phase or single-pole overhead line in five wires in phase; in FIG. 6-9 - sections G-D, D-D, E-E and MF in FIG. 5.

An overhead power transmission line contains poles or phases / split into five or more wires 1-8, the position of which in the spans between the supports 9 and 10 is fixed by means of concentrated struts 11 and paired struts 12, dividing the spans into sub-spans. The closest struts 11 are installed closest to the supports 9 and 10. The first sub-spans from the supports are made not less than twice as short as the sub-spans about the middle part of the span. Paired spacers 12 in terms of the number of wires in phase form groups, each of which is located in two planes for even (see Fig. 1) or DTpex planes for odd (see Fig. 5) number of wires in phase. In this case, all the wires of the split phase are connected along the perimeter by paired struts 12 of each group, and the first groups of paired struts 12 are installed between the first and second from each of the supports 9 and 10 by concentrated struts 11, and the distance between the first group of paired struts 12 and the second from each of the supports 9 and 10 with a concentrated strut 11 exceeds the distance between the first group of paired struts 12 and the first from each of the supports 9 and 10 with a concentrated strut 11.

To intensively dampen the vibrations of the wires at the supporting clamp, the first sub-spans from the supports are shortened (e.g., 20 m) in comparison with other sub-spans.

The distance between the planes in which the pair struts 12 of one group are located is 1 m.

In one plane (see Fig. 3), pair spacers 12 connect adjacent wires of phase 2 and 3. 4 and 5, 6 and 7, 1 and 8, in another (see Fig. 4) wires 1 and 2, 3 and 4, 5 and 6, 7 and 8. i.e. connected along the perimeter of the B7: e phase wire. In FIG. Figure 5 shows the arrangement of spacers in a single-phase or single-pole overhead line with five wires in phase located

in the phase cross section at an equal distance from each other around the circumference.

With a three-phase AC line or a bipolar DC line, the spacers are installed in all phases (or poles) in the same way. Each group of paired spacers consists of 5-pair spacers 12 by the number of wires in phase.

Paired struts 12 are located in three

0 plane x. The distance between the planes, 0 of which are spacers 12 - 1 m,

In one plane (see Fig. 7), the spacers 12 connect wires 1 and 5, in another (see Fig. 8) - wires 2 and 3, 5 and 4, in the third (see

5 fig. 9) - wires 1 and 2, 3 and 4.

The operation description of the overhead line according to the invention is carried out with respect to V.P. with eight wires (see Fig. 1). For overhead lines with an odd number of wires in the phase of operation of the spacers, the effect obtained is similar.

The installation of concentrated spacers 11 in the span between supports 9 and 10 makes it possible to rigidly fix a predetermined phase configuration (arrangement of wires, its components), since concentrated spacers 11 have a rigid body with clamps for fastening phase wires. Installation in phase of a group of paired struts 12,

According to studies, the phases connected along the perimeter of the wire in different planes increase the efficiency of limiting the vibrations of wires, since it prevents the formation of standing waves of wire vibrations in the span and increases the damping properties of a group of spacers compared to a group of diagonal spacers, passage within the perimeter of the split phase.

0 The most common damage to the wires is due to fluctuations in the output from the supporting clamps, i.e. in the place of fastening the phase to the support. The limitation of fluctuations in these places is most effective5, achieved by reducing the lengths of the first sub-spans at supports 9 and 10 by at least half as compared with sub-spans in the middle of the line. In order to enhance this effect in the second sub-spans between the concentrated struts 11, a group of paired struts 12 is installed at a distance of 1/3 of the length of the second sub-span 11.

So the first three sub-spans,

5 adjacent to the supports have lengths, for example, 0.5 I, 0.3 I and 0.7 I, where I is the length of the sub-span in the middle of the span.

The presence of three sub-spans at the supports substantially unequal in length additionally provides a limited number of wires due to the effect of detuning the vibrations of the wires due to the difference in the frequencies and phases of the vibrations of the wires of adjacent sub-spans. (56) Zelichenko A.S. et al. Design of 750 kV overhead power lines. On Sat Long-distance power transmission 750 kV under

Claims (1)

The claims ELECTRIC TRANSMISSION AIRLINE, containing poles or phases, split into five or more wires, the position of which in the spans between the supports is fixed with the help of concentrated and paired struts, dividing the spans into sub-spans, characterized in that, in order to increase reliability by more effective limitation of the wire vibrations caused by the wind, the closest spacers are installed closest to the supports, the first sub-spans from the supports are made not less than half as short as in the middle part 6-6 fi.Z Edited by A.M. Nekrasov et al. - M .: Energy. 1974, p. 161. Fig. 36. Drawing NJ 2249-25-592 for OHL 750 kV. - Konakovo - Leningrad of the North-West Branch of the All-Russian State Pedagogical Institute and Research Institute Energosetproekt. 1975. spans, pair spacers according to the number of wires in the phase form groups, each of which is located in two planes with even or three planes with an odd number of wires in phase, and pair spacers of each group are connected along the perimeter of the whole wire of the split phase, and the first groups of paired struts are installed between the first and second from each of the pillars by concentrated struts, while the distance between the first group of paired struts and the second from each of the pillars by a concentrated strut exceeds a looser between the first group second pair of spacers and the first of each of the spacer supports concentrated. -4 fpus g j 6 FIG. fpuf.f L-l l-d E-  GGK i-1