Anti? Zhen? Party? Case? Design? Meter? A breeze vibration? Cause vibration when the breeze steady breeze overhead lines, overhead lines in the leeward side of the formation of a certain frequency alternating upper and lower air vortex This vortex air flow from top to bottom so that the trolley wire by the same frequency of alternating impact force, when the natural frequency of the impact force is equal to the frequency of the trolley wire, the trolley wire will resonate in a vertical plane, i.e. aeolian vibration. ? Aeolian vibration is a high frequency, small amplitude wire movement, resulting in wind direction and wind vibration perpendicular to the direction of the wire, wind speed 0.5-8.0m / s, the amplitude value is generally no more than a few centimeters, the frequency range is generally 3- 120Hz. ? Aeolian vibration wave is weak wave that node does not move up and down alternating antinodes. Its consequences will lead off shares, fittings and tower component damage, and even break off shares become accidents. ? Second, the common anti-vibration measures? For cable (OPGW or ADSS), a commonly used anti-vibration hammer, vibration whip. ? Damper is a tone frequency of the damper, for large diameter wire, with a very effective anti-vibration effects. The basic principle is the dynamic energy absorption. Under normal circumstances, there is a tone frequency of the damper characteristics specific frequency range. Anti-vibration whip (spiral damper) is commonly used as a shock absorber type, vibration whip distribution lines and fiber optic lines to high-frequency vibrations of small diameter damping is very effective. Whip by clashing with anti-vibration cable to dissipate vibration energy, and thus achieve the effect of weakening the line aeolian vibration. This type of shock absorber is very effective for small diameter wire vibration-proof, while for the larger diameter of the line, the effect is not ideal. In short, it's anti-vibration damping effect depends on the relationship between quality and wire whip and frequency. ? The main reason they are widely used is:? ⒈ principle mature anti-vibration, vibration effects in laboratory and field test results compared with the ideal installation, has many years of operating experience. ? ⒉ simple structure, easy to install, easy to maintain. ? But they are anti-vibration principle is different, and therefore the use of OPGW cable damper more, and anti-vibration due to the high frequency vibration sensitive whip on the ADSS cable is widely accepted by users. ? Third, the anti-vibration solutions 1. OPGW cable parameters:?? To tender OPGW cable parameters for the calculation basis. ?.?? 2 anti-vibration measures 2.1 installation location is calculated:? L1 = 0.4D (mm) ??? L2 = 0.75L1 L3 = 0.6L1 From the fourth only damper, using equidistant installation method??? that the two damper center distance is 0.6? L1. ? Where: D: for cable diameter (mm) T:? For the average running tension (N) M:?? For the cable unit weight (g / mm) due to the small amplitude vibration hammer will make allergic reactions When the damper is installed at any location in the middle of the half-wave, satisfactory results are obtained, even if installed on the node, the damper due to the reverse effect will play better results. So, according to the above formula to calculate the installation location is not ideal, you can make small adjustments. ???? 2.2 Note:? ⑴ According to calculations, if the damper is calculated on the installation position falls within the twisted wire, it is not necessary to install protective lines, can be installed directly. ? ⑵ If the damper position calculation falls on OPGW cable installation, you need to install the protection line, and pay attention to protect the line a distance of at least the end of the skein 50-80mm. ? ⑶ If the damper is calculated on the installation position falls outside the skein, the skein is mounted directly on the inner and outer damper twisted wire ends from the center of 50-80mm. ?? 2.3 damper installed base terrain is along this line 110KV line Terrain:? Hills account for 69%; 11% mountainous; 20% of the annual average farm run OPGW cable tension generally take ultimate tensile strength (RTS) in.? 20%. The number of anti-vibration hammer configuration is as follows:?? No. Use span L (m) the quantity of each damper gear (only) 1 100≤L <250 2 2 250≤L <500 4 3????????? 500≤L <750? 6? 4? 750≤L <1000? 8? 2.4 installation direction? Damper big hammer toward the side of the tower (installation orientation does not affect the anti-vibration damper effect). ? 2.5 hanging point protection? Damper using special care line