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Basic Formula to calculate String Efficiency of Insulators

String efficiency provides information about potential distribution across the string of insulators. Today you'll learn the basic formula to calculate string efficiency of insulators.

Let's get started:
Let's solve a few examples for better understanding.

Example 1: Find the string efficiency of a 37 kV string containing 20 insulators. The potential across lowest disc is 2 kV.

Solution: String efficiency = [37] / [2 * 20] = 92.5

Example 2: Calculate the string efficiency of 50 kV string containing 13 insulators. The potential across the nearest disc to the conductor is 5 kV.

Solution: String efficiency = [50] / [5 * 13] = 76.9%

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