CN202142828U

CN202142828U - Anti-waving overhead transmission line

Info

Publication number: CN202142828U
Application number: CN201120210327U
Authority: CN
Inventors: 张金德; 阳镇生; 朱艳君; 寻凯
Original assignee: DC CONSTRUCTION BRANCH STATE GRID CORP OF CHINA
Current assignee: DC CONSTRUCTION BRANCH STATE GRID CORP OF CHINA
Priority date: 2011-06-21
Filing date: 2011-06-21
Publication date: 2012-02-08
Anticipated expiration: 2021-06-21

Abstract

The present utility model relates to an anti-waving overhead transmission line. The anti-waving overhead transmission line is a split conducting wire, the split conducting wire is composed of a plurality of sub conducting wires, if the number of the sub conducting wires is an even number, one half of the sub conducting wires are left-laid conducting wires, and the other half are right-laid conducting wires. If the number of the sub conducting wires is an odd number, parts of the sub conducting wires are left-laid conducting wires, the other parts are right-laid conducting wires, and every two adjacently arranged sub conducting wires are of different twist directions. In the overhead transmission line, the left-laid conducting wires are combined with the right-laid conducting wires, thus the self torsion force characteristic of the split conducting wire can be changed without increasing any investments or resorting to other accessory equipments, and the aim of waving treatment, even waving elimination can be reached.

Description

The anti-overhead transmission line of waving

Technical field

The utility model relates to a kind of anti-overhead transmission line of waving, and is exclusively used in the prevention of overhead transmission line galloping.

Technical background

Transmission line wire often freezes easily in the winter time, when extraneous initial conditions such as ice, wind and wiring system self frequency near the time, will excitation resonance, the waving of generation transmission line.Waving of transmission line has huge harm, can cause the transmission line tripping operation, broken string takes place when serious and fall tower.

Conductor galloping problem the fifties in last century four takes place external the sixth of the twelve Earthly Branches; China's the seventies in last century along with power network development after extensively adopting bundle conductor; In late nineteen eighties conductor galloping having taken place also, become the significant problem that influences electric power netting safe running so far always, has obtained common concern.Serious waving all took place in the most of province of China, and the loss that is caused is very serious.

Early oneself studies to the conductor galloping problem both at home and abroad, but overweights theoretical research, and the conductor galloping equation of motion has several versions, is mostly uncertain but relate to factor, thereby is difficult to make calculating with its equation of motion.The common viewpoint of the condition of waving is that the medium wind of nearly quadrature is arranged, and again with regard to wire icing, but last ice coating wire also has the situation of waving.It is believed that to wave to be-kind of transverse vibration twisting vibration, produce the torsional moment of twisting vibration, be that the wind effect produces due to the lift, but do not propose the lift computational methods.Foreign study is not done the physical process of bright conductor galloping, and institute's theory of carrying not illustrative is waved actual conditions, so do not propose proper prophylactic methods.In fact conductor galloping and lead state, stress state, the swing of wind lead; The straight line wire clamp waves, lead transverse vibration natural frequency, the frequency of wind; Factors such as span are relevant; The factor that has is immeasurable, thus wave research can only be qualitative and can not be quantitative, quantitative study can not obtain satisfied effect.We can say that conductor galloping is a chance event.

Anti-dance measure both at home and abroad at present mainly contains off resonance pendulum, two parallel wielded-proof device, revolution conductor spacer, inter-phase spacer, flow-disturbing line, combination stockbridge damper etc.; Use domestic equal the sixth of the twelve Earthly Branches; But its effect is unsatisfactory, can only reduce to wave amplitude under certain condition, waves and can not fundamentally eliminate.In fact the problem of waving is inreal to be solved.And, changed the mechanical characteristic and the sag characteristic of lead simultaneously owing to the increase of waving equipment has in a large number increased investment on the one hand, influence useful life, economy and the fail safe of lead.

Summary of the invention

The purpose of the utility model is in order to overcome problem and the defective that above-mentioned prior art exists; A kind of anti-overhead transmission line of waving is provided; Adopt two kinds of different combinations of twisting with the fingers guiding line of left-hand lay and right-laid to use; Thereby do not increasing under any investment and the prerequisite, changing bundle conductor self torsion characteristic, reaching to wave and administer even eliminate the purpose of waving by other accessory device.

Through a large amount of research with wave the observation of phenomenon, except that factors such as external world's ice, wind, line alignment, the twisted wire torque characteristic of lead self also is the key factor of waving.The basic physical process of waving is the example explanation with the left-hand lay lead; Wind line shelves lead produces torsional moment, and suspension point left side lead torsional direction is consistent with porcelain and the wind of going here and there pendulum direction, effect lead upthrow; Suspension point right side lead torsional direction and magnetic and the wind of going here and there pendulum are in the opposite direction; The effect lead presses down. and make lead upthrow such as torsional moment very big, must make lead rotate motion, line retaining generation this moment transverse vibration promptly forms waves.

Weaken the lead torsional moment; Single conductor is not waved has only bundle conductor to wave; Because of the bundle conductor torsional moment quite big; Explain that the lead torsional moment is the chain factor of closing of waving, lead does not have torsional moment both to make to take place transverse vibration can not form to wave yet, thereby Xu's lead torsional moment of managing to disappear is to remove the dance key measure.

The technical scheme of the utility model is:

A kind of anti-overhead transmission line of waving, the anti-overhead transmission line of waving is a bundle conductor, and bundle conductor is if be made up of even number root lead, and wherein half sub-conductor is the left-hand lay guiding line, and half sub-conductor is the right-laid guiding line; Bundle conductor is if be made up of the odd number root lead greater than 1, and the center molecular wire is the left-hand lay guiding line, and the parton lead is the right-laid guiding line; And arrange adjacent two root leads for different twist with the fingers to lead.

Engineering design adopts left-hand lay to twist with the fingers guiding lines to reaching right-laid to two kinds for the line segment bundle conductor that possibly wave; The torsional moment that produces between different bundle conductors is offset; This is to use not have to turn round establishment steel wire rope principle; Thereby lead does not take place receive torsional moment effect upthrow, straight line folder torsionless square stores simultaneously.Adopting the utility model when especially carrying out thread-changing and transform for newly-built circuit or to circuit is most economical, effective method.

The utility model adopts left-hand lay to use to two kinds of different combinations of twisting with the fingers guiding lines to reaching right-laid; Promptly half the is the left-hand lay guiding line; Half the is the right-laid guiding line; Thereby do not increasing under any investment and the prerequisite, changing bundle conductor self torsion characteristic, reaching to wave and administer even eliminate the purpose of waving by other accessory device.

Description of drawings

Fig. 1 is the right-laid guiding line sketch map of the utility model.

Fig. 2 is the left-hand lay guiding line sketch map of the utility model.

Fig. 3 is the conductors on quad bundled sketch map of the utility model.

Fig. 4 is the six-multiple conductor sketch map of the utility model.

Embodiment

As depicted in figs. 1 and 2, the sub-conductor of high pressure, superhigh pressure and ultra high voltage overhead transmission line that the utility model is used is divided into steel reinforced aluminium conductor, steel core aluminium alloy stranded conductor, aluminium-clad steel wire.Sub-conductor is that multi-lever and multi-strand strand system forms, and the strand system is in the opposite direction between adjacent layer.Left-hand lay shown in Fig. 1 and Fig. 2 is to being meant the strand system direction of outermost layer lead strand with the right-laid guiding line.

As shown in Figure 3, the anti-overhead transmission line of waving of the utility model is 4 bundle conductors, and is made up of 4 root leads; Wherein 2 root leads are the left-hand lay guiding line; In addition 2 leads are the right-laid guiding line, and adjacent two root leads be different twist with the fingers to lead, by putting in order sub-conductor compiled that to go up sequence number be 1,2,3,4; Promptly 1, No. 3 oidiospore lead is the right-laid guiding line, and 2,4 work song bundle conductors are the left-hand lay guiding line.

As shown in Figure 4, the anti-overhead transmission line of waving of the utility model is 6 bundle conductors, and is made up of 6 root leads; Wherein 3 root leads are the left-hand lay guiding line; In addition 3 leads are the right-laid guiding line, and adjacent two root leads be different twist with the fingers to lead, by putting in order sub-conductor compiled that to go up sequence number be 1,2,3,4,5,6; Promptly 1,3, No. 5 oidiospore lead is the left-hand lay guiding line, and 2,4,6 work song bundle conductors are the right-laid guiding line.

In like manner for 2 divisions, 8 divisions, 10 bundle conductors etc., by putting in order sub-conductor compiled and to go up sequence number, and the like the odd-numbered sub-conductor be left-hand lay to or the right-laid guiding line, the even-numbered sub-conductor be right-laid to or the left-hand lay guiding line.

In like manner for 3 divisions, 5 divisions, 7 divisions, 9 bundle conductors etc., by putting in order sub-conductor compiled and to go up sequence number, and the like the odd-numbered sub-conductor be left-hand lay to or the right-laid guiding line, the even-numbered sub-conductor be right-laid to or the left-hand lay guiding line.

Claims

1. anti-overhead transmission line of waving, it is characterized in that: the anti-overhead transmission line of waving is a bundle conductor, and bundle conductor is if be made up of even number root lead, and wherein half sub-conductor is the left-hand lay guiding line, and half sub-conductor is the right-laid guiding line; Bundle conductor is if be made up of the odd number root lead greater than 1, and the center molecular wire is the left-hand lay guiding line, and the parton lead is the right-laid guiding line; And arrange adjacent two root leads for different twist with the fingers to lead.