In the work of live replacement of transmission line insulators,due to the complicated calculation formula of line vertical load and stress,it will take much time for the operators to calculate the vertical load and stress required for selecting appropriate bearing tools needed.Taking the work of replacing 220 kV insulators as an example,this essay per-forms a mechanical analysis of the load-bearing tool.It then puts forward an estimation method to calculate the tension of the tool which can simply and effectively obtain vertical load and stress of the line at the working point.
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