CN101299524A - Sound wave oscillation method for snow-resistance and deicing of high tension power line - Google Patents

Abstract

The invention discloses an snow resistant and deice acoustic wave vibration method used in the high pressure power transmission line, wherein an acoustic wave generating device is arranged on the high pressure transmission tower, and a vibrating bar of the acoustic wave generating device is clung to the insulation porcelain ring at one side of the iron tower of the high pressure power transmission line. When in working, the vibrating bar of the acoustic wave generating device knocks the end of the high pressure power transmission line to generate the acoustic wave, which is used to cause the vibration of the high pressure power transmission line by the transmission on the high pressure power transmission line. When the vibration transmitted to the insulation porcelain ring of the one side of the iron tower is reflected, the incident wave and the reflection wave form the standing wave on the high pressure power transmission line, to cause the high pressure power transmission line to vibrate to reach the aim of snow resistant and deice. The invention prevents the nival deposit on the high pressure power transmission line and removes the sown on attached on the high pressure power transmission line, which provides the safeguard for the safety of the power transmission device in the heavy snow.

Description

The acoustic vibration method that is used for the anti-snow and ice of high voltage transmission line

Technical field

The present invention relates to a kind of acoustic vibration method that is used for the anti-snow and ice of high voltage transmission line.

Background technology

At the beginning of 2008, China south has suffered from the especially big snow disaster of fifty year return period, make that the power transmission facility of southern each province suffers serious loss.Particularly high voltage transmission line is under the weather conditions of severe snow, on the deposition thick ice and snow layer, make the deadweight of high voltage transmission line increase greatly, finally caused fractureing even high voltage power transmission tower being forgotten about it of high voltage transmission line.The method that solves ice and snow deposition on the high voltage transmission line at present mainly is to dispose method afterwards, for example power worker's work high above the ground, utilize insulator arrangements such as wooden stick and rubber hammer to remove on the high voltage transmission line and deposit ice and snow, this method is inefficiency not only, and danger coefficient is very high for the power worker.The method that has the self-heating that utilizes after the high voltage transmission line short circuit to melt deposition ice and snow in addition, but because the numerical value of the heat of fusion of ice is bigger, and the resistance value of high voltage transmission line is less, this measure will certainly wasteful energies, and be with high costs.

Summary of the invention

The purpose of this invention is to provide a kind of acoustic vibration method that is used for the anti-snow and ice of high voltage transmission line.

It is to place sound wave generating device on high voltage power transmission tower, and the vibrating arm of sound wave generating device is close to the insulation porcelain ring place of high voltage transmission line one side iron tower, during work, the end that the vibrating arm of sound wave generating device knocks high voltage transmission line produces sound wave, utilize the fluctuation of the sound wave propagation on high voltage transmission line causing high voltage transmission line, when wave propagation is reflected behind the insulation porcelain ring of high voltage transmission line opposite side iron tower, then incident wave and reflected wave form standing wave on high voltage transmission line, make high voltage transmission line produce vibration, reach anti-snow and ice purpose.

The frequency of sound wave of described sound wave generating device is: 20～100 KHz, acoustic wave energy 1～100kJ.The length of high voltage transmission line is 100～2000 meters, and the cross-sectional area of high voltage transmission line is: 50～1000mm ²High voltage transmission line voltage is 100～500kV.

The present invention can prevent the deposition of ice and snow on the high voltage transmission line efficiently and remove the ice and snow that adheres on the high voltage transmission line under lower energy consumption and condition of cost, for the safety of transmission facility under the severe snow weather conditions provides guarantee.

Embodiment

The acoustic vibration method that is used for the anti-snow and ice of high voltage transmission line is to place sound wave generating device on high voltage power transmission tower, and the vibrating arm of sound wave generating device is close to the insulation porcelain ring place of high voltage transmission line one side iron tower, during work, the end that the vibrating arm of sound wave generating device knocks high voltage transmission line produces sound wave, utilize the fluctuation of the sound wave propagation on high voltage transmission line causing high voltage transmission line, when wave propagation is reflected behind the insulation porcelain ring of high voltage transmission line opposite side iron tower, then incident wave and reflected wave form standing wave on high voltage transmission line, make high voltage transmission line produce vibration, reach anti-snow and ice purpose.

The frequency of sound wave of described sound wave generating device is: 20～100 KHz, acoustic wave energy 1～100kJ.The length of high voltage transmission line is 100～2000 meters, and the cross-sectional area of high voltage transmission line is: 50～1000mm ²High voltage transmission line voltage is 100～500kV.

When wave propagation is reflected behind the insulator of opposite side iron tower, then incident wave and reflected wave form standing wave on high voltage transmission line.When sound wave in lead when the x direction is propagated, get lead one volume element Δ V, then the kinetic energy Δ E of this volume element _kWith potential energy Δ E _pBe respectively:

$\mathrm{\Δ}{E}_k=\frac{1}{2}\mathrm{\Δm}{v}^2=\frac{1}{2}\mathrm{\Δm}{\left(\frac{\∂y}{\∂t}\right)}^2$

$\mathrm{\Δ}{E}_p=\frac{1}{2}\mathrm{Y\ΔV}{\left(\frac{\∂y}{\∂x}\right)}^2$

Wherein Y is the Young's modulus of lead.Then the gross energy of volume element is Δ E=Δ E _k+ Δ E _pBecause the side of standing wave

Journey is: y=2Acos ω tcos kx

Can get after the expression formula of substitution volume element gross energy:

$\mathrm{\Δ}{E}_k=\frac{1}{2}\mathrm{\ρ}\left(4A^2{\mathrm{\ω}}^2{\sin }^2\mathrm{\ωt}{\cos }^2\mathrm{kx}\right)\mathrm{\ΔV}$

$\mathrm{\Δ}{E}_p=\frac{1}{2}\mathrm{\ρ}\left(4A^2{\mathrm{\ω}}^2{\cos }^2\mathrm{\ωt}{\sin }^2\mathrm{kx}\right)\mathrm{\ΔV}$

So the gross energy of volume element is:

$\mathrm{\ΔE}=\frac{1}{2}\mathrm{\ρS}4A^2{\mathrm{\ω}}^2({\sin }^2\mathrm{\ωt}{\cos }^2\mathrm{kx}+{\cos }^2\mathrm{\ωt}{\sin }^2\mathrm{kx})\mathrm{\Δx}$

In adjacent node, utilize integration to be in the hope of the gross energy of a node standing internal wave:

$E=\∫\mathrm{dE}={\∫}_{x_n}^{x_n^{\′}}\frac{1}{2}\mathrm{\ρS}4A^2{\mathrm{\ω}}^2({\sin }^2\mathrm{\ωt}{\cos }^2\mathrm{kx}+{\cos }^2\mathrm{\ωt}{\sin }^2\mathrm{kx})\mathrm{dx}=\frac{1}{4}\mathrm{\ρS\λ}{A}^2{\mathrm{\ω}}^2$

Wherein ρ is a wire density, and S is a conductive wire cross-section, and λ is a wave length of sound, and A is a sonic wave amplitude, and ω is the sound wave angular frequency.The 400/35 type leads of the many employings of high voltage transmission line at present, wherein the external aluminium thigh part cross-sectional area of 400 expression leads is 400mm ², 35 expression steel core part cross-sectional areas are 35mm ², the deadweight of its 1m length is 1.511kg, so the density p of lead is 3473.6kg/m ³And the spacing of present high voltage power transmission tower is between 400-1000m.Suppose to adopt the sound wave of frequency f=20kHz, its amplitude is 1cm, because the propagation velocity of sound wave in lead is 5200m/s, so wavelength is 0.26m.Suppose that the power transmission tower spacing is 1000m, then between Liang Ta, have 7692 antinodes, the expression formula of the energy of the node standing internal wave in contact front, then between two power transmission towers, making a lead produce standing wave institute energy requirement is 9.493kJ.One of current 500kV high voltage circuit is 3 phase conductors, and every then phase conductor has 4, and totally 12 leads also have 2 lightning conducters, makes somebody a mere figurehead 14 lines that have in the sky.So at the required gross energy of two power transmission tower chien shih conductor vibrations is 132.9kJ.Because standing wave is outside Propagation of Energy not, so these energy can be kept the vibration of lead.In fact because the influence of various dampings, and ice and snow drops on the influence on the lead, and required energy can surpass calculated value, but its energy consumption still is significantly smaller than and adopts the lead short circuit deicing institute energy requirement that generates heat.Because the heat of fusion of ice is 333kJ/kg, suppose that it is 1cm that power transmission line covers ice sheet, then ice sheet weight is 1.04kg on the 1m power transmission line, for the long power transmission line of 1000m, even suppose 10% ice sheet thawing ice sheet is come off fully, the energy that still needs energy 34632kJ is greatly greater than the energy of foregoing 9.493kJ.

The eve that occurs the severe snow weather in weather forecast, utilize remote control to start the sound wave generating device that is installed on the high voltage power transmission tower, make high voltage transmission line before the ice and snow deposition, vibrate in advance, then in the severe snow arrival, the vibrational energy of the power transmission line ice and snow on the power transmission line that effectively shakes, prevent the deposition of ice and snow, accomplish the effect of obviate.And if find later on to be wrapped up by ice and snow on the power transmission line at severe snow, then still can start the sound wave generating device on the high voltage power transmission tower, make conductor vibration, utilize the pliability and the ice sheet stiffness difference of plain conductor, fall ice sheet is shatter, thereby reach the effect of afterwards removing ice and snow.

Claims (4)

1. acoustic vibration method that is used for the anti-snow and ice of high voltage transmission line, it is characterized in that on high voltage power transmission tower, placing sound wave generating device, and the vibrating arm of sound wave generating device is close to the insulation porcelain ring place of high voltage transmission line one side iron tower, during work, the end that the vibrating arm of sound wave generating device knocks high voltage transmission line produces sound wave, utilize the fluctuation of the sound wave propagation on high voltage transmission line causing high voltage transmission line, when wave propagation is reflected behind the insulation porcelain ring of high voltage transmission line opposite side iron tower, then incident wave and reflected wave form standing wave on high voltage transmission line, make high voltage transmission line produce vibration, reach anti-snow and ice purpose.

2. a kind of acoustic vibration method that is used for the anti-snow and ice of high voltage transmission line according to claim 1 is characterized in that the frequency of sound wave of described sound wave generating device is: 20～100 KHz, acoustic wave energy 1～100kJ.

3. a kind of acoustic vibration method that is used for the anti-snow and ice of high voltage transmission line according to claim 1, the length that it is characterized in that described high voltage transmission line is 100～2000 meters, the cross-sectional area of high voltage transmission line is: 50～1000mm ²

4. a kind of acoustic vibration method that is used for the anti-snow and ice of high voltage transmission line according to claim 1 is characterized in that described high voltage transmission line voltage is 100～500kV.