Voltage Distribution by Standard Formula

       When the number of units is a string of suspension type of insulator increases, calculation of voltage across each unit and the string efficiency becomes tedious, laborious and time consuming by the method discussed earlier. In such a case, following formulae can be used.
Let     V = Voltage across string
          k= Ratio of shunt to mutual capacitance
          n = Number of units in the string
V1 , V2, V3 … = Voltages across the units starting from the line unit. Note that V1, V2, V3 …  are defined from bottom to top. Then voltages across xth unit is given by, 

      While the string efficiency given by,




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