EVALUATION OF A PHYSICAL SNOW ACCRETION MODEL BY LABORATORY EXPERIMENT
Snow-resistant (SR) rings and counterweights (NBD) have been used by Hokkaido Electric Power to prevent snow accretion on transmission lines. These qualitative effects have been widely appreciated from observation and actual performance in Hokkaido. However, problem seems to lie in the fact that galloping is promoted by installing NBD on transmission lines. The installation standard of NBD at Hokkaido Electric Power has been determined by numerical computing results of a physical snow accretion model suggested by Goto in the 1970s. This model can compute the growing process to cylindricalsleeve snow on a transmission line. Therefore, in order to optimize the installation standard of NBD, it is important that the accuracy of this model is elevated. In this study, in order to arrange accuracy improvement of this model, the adequacy of this model has been evaluated by laboratory experiment using a test conductor. The test conductor, which has a length of about 1.5m, simulates a short part of a transmission line. It has the function of simulating the torsional rigidity of wiring of a conductor. We performed the experiment in a temperature-controlled room. In performing the experiment, the snowfall was reproduced by grinding down natural snow on metallic mesh. The wind was reproduced with the air blower. The data items collected are the angle of twist of the test conductor, the weight and outside diameter of snow accretion in the growing process to cylindrical-sleeve snow. The image of the growing process to cylindrical-sleeve snow on the test conductor was recorded. From the results of the experiment, it has been reconfirmed that this model is valid, because the computing results of this model are similar to that of data and images collected in the experiment. Further, to improve the model more accurately, it has been found that it is important to evaluate properly the increasing amount of snow accretion on the test conductor surface.
Takuya Yoshimatsu Keitaro Fujii Tomoki Watanabe
Hokkaido Electric Power Co., Inc, Japan
国际会议
The 14th International Workshop on Atmospheric Icing of Structures(第十四届结构物大气覆冰国际研讨会 IWAIS 2011)
重庆
英文
114
2011-05-08（万方平台首次上网日期，不代表论文的发表时间）