One piece porcelain pin-type insulators are used on lines where the voltages are less than ?

One piece porcelain pin-type insulators are used on lines where the voltages are less than ?

• A. 23 kV
• B. 32 kV
• C. 45 kV
• D. 69 kV

Answer: (A)

Single-piece pin-type porcelain insulators are chosen for lines where the voltage level is low enough that a single insulator can provide sufficient insulation and mechanical support. As voltage increases, the required creepage distance and insulation strength grow, so a single piece no longer provides adequate protection and you’d use multiple insulators in a string or a different type altogether. That’s why these insulators are used on lines under about 23 kV. Higher voltages like 32, 45, or 69 kV require additional insulators or different configurations to handle the greater electrical stress.

Single-piece pin-type porcelain insulators are chosen for lines where the voltage level is low enough that a single insulator can provide sufficient insulation and mechanical support. As voltage increases, the required creepage distance and insulation strength grow, so a single piece no longer provides adequate protection and you’d use multiple insulators in a string or a different type altogether. That’s why these insulators are used on lines under about 23 kV. Higher voltages like 32, 45, or 69 kV require additional insulators or different configurations to handle the greater electrical stress.