String efficiency of 100% means in string insulators
- A. Self capacitance is zero
- B. Shunt capacitance is maximum
- C. Self capacitance is maximum
- D. Shunt capacitance is zero
Answer: D. Shunt capacitance is zero
Explanation: String efficiency = (Total voltage) / (n × Voltage across bottom disc). It reaches 100% when voltage distribution across all discs is perfectly uniform, which occurs when shunt capacitance C1 to ground is zero.