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If a string of suspension insulator has three units, each can withstand a maximum 11 KV and total string can withstand 25.76 KV. What is the string efficiency?
- a)234.1%
- b)46.3%
- c)68.75%
- d)78%
Correct answer is option 'D'. Can you explain this answer?
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If a string of suspension insulator has three units, each can withstan...
Suspension Insulators
Suspension insulators are widely used in electrical power systems to support overhead transmission lines. They are designed to provide insulation and mechanical support to the conductors, while also preventing electrical leakage and flashover.
String Efficiency
The string efficiency of a suspension insulator string is a measure of its ability to distribute the applied voltage equally across all the insulator units. It is given by the ratio of the maximum voltage that can be applied to the entire string to the sum of the maximum voltages that each unit can withstand individually.
Given Parameters
Number of units in the string (n) = 3
Maximum voltage withstand by each unit (V) = 11 KV
Total voltage withstand by the string (Vt) = 25.76 KV
Calculating String Efficiency
The maximum voltage that can be applied to the entire string is equal to the maximum voltage withstand by each unit multiplied by the number of units in the string.
Maximum voltage of the string (Vs) = V * n = 11 KV * 3 = 33 KV
The string efficiency (SE) is then given by the ratio of the total voltage withstand by the string to the maximum voltage of the string.
SE = (Vt / Vs) * 100 = (25.76 KV / 33 KV) * 100 = 0.78 * 100 = 78%
Therefore, the string efficiency of the suspension insulator string is 78%.
Conclusion
In this question, we were given the number of units in the suspension insulator string, the maximum voltage withstand by each unit, and the total voltage withstand by the string. By calculating the maximum voltage of the string and applying the formula for string efficiency, we determined that the string efficiency is 78%.
Suspension insulators are widely used in electrical power systems to support overhead transmission lines. They are designed to provide insulation and mechanical support to the conductors, while also preventing electrical leakage and flashover.
String Efficiency
The string efficiency of a suspension insulator string is a measure of its ability to distribute the applied voltage equally across all the insulator units. It is given by the ratio of the maximum voltage that can be applied to the entire string to the sum of the maximum voltages that each unit can withstand individually.
Given Parameters
Number of units in the string (n) = 3
Maximum voltage withstand by each unit (V) = 11 KV
Total voltage withstand by the string (Vt) = 25.76 KV
Calculating String Efficiency
The maximum voltage that can be applied to the entire string is equal to the maximum voltage withstand by each unit multiplied by the number of units in the string.
Maximum voltage of the string (Vs) = V * n = 11 KV * 3 = 33 KV
The string efficiency (SE) is then given by the ratio of the total voltage withstand by the string to the maximum voltage of the string.
SE = (Vt / Vs) * 100 = (25.76 KV / 33 KV) * 100 = 0.78 * 100 = 78%
Therefore, the string efficiency of the suspension insulator string is 78%.
Conclusion
In this question, we were given the number of units in the suspension insulator string, the maximum voltage withstand by each unit, and the total voltage withstand by the string. By calculating the maximum voltage of the string and applying the formula for string efficiency, we determined that the string efficiency is 78%.
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Community Answer
If a string of suspension insulator has three units, each can withstan...
String Efficiency = [( flashover voltage of the string) / (n × flashover voltage of 1 unit)] × 100
Where ‘n’ is number of units in one string
Hence, String Efficiency = [25.76 / (3 × 11)] × 100
= 78%.
Where ‘n’ is number of units in one string
Hence, String Efficiency = [25.76 / (3 × 11)] × 100
= 78%.
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