The string
efficiency of n units is defined as :
Flash over
voltage of string of n units
Flash over
voltage of string of n units/n times flash over voltage of one unit
n times flash over voltage of one unit/ Flash over voltage of string of
n units
n times flash
over voltage of one unit
Flash over
voltage of string of n units/n times flash over voltage of one unit
String efficiency
Where,
n = Number of disc.
Greater the
string efficiency, more uniform is the voltage distribution.
Hence, the
correct option is (B).
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