Modeling ice and snow accretion for designing power lines (case study: Baladeh Nur)

With the development of urban and rural areas, specifically in the foothills and mountainous areas of West Mazandaran province, electricity supply has become a necessity today. On the other hand, due to the massive climate changes in recent decades, which in turn has caused sudden snow and freezing in this region, the map of snow and ice loads that has been developed previously by the Ministry of Energy is not applicable anymore, or has not been reviewed for many newly developed urban and rural areas. Therefore, in this research, we try to calculate snow and ice loads by using the latest data, meteorological statistics and statistical methods for the design of electricity transmission lines. For this purpose, by using meteorological data (from 2005 to2018) for Baladeh area and using simulation method provided by laboratory and engineering institute of cold regions (CCREL), the program is applied to calculate the amount of ice thickness in Excel environment. They were written at two heights of 10 and 35 meter (average height of the cables) and then the histograms were plotted using the Smada software. In this research, the statistical parameter of ice load has been investigated in the multi-year return periods for the mountainous area of  Baladeh as one of the most important loadings on the transmission tower. Finally, nominal values with different return periods are proposed. The results showed that for the design of power transmission lines with a return period of less than 50 years, the region of  Baladeh is a heavy region, and with the return period of more than 50 years, it is a super-heavy region (in accordance with the code).In this research, the statistical parameter of ice load has been investigated in the multi-year return periods for the mountainous area of Baladeh as one of the most important loadings on the transmission tower. Finally, nominal values with different return periods are proposed. The results showed that for the design of power transmission lines with a return period of less than 50 years, the region of Baladeh is a heavy region, and with the return period of more than 50 years, it is a super-heavy region (in accordance with the code).