railway RRB JE (CBT I + CBT II) Mock Test 2024 Power Systems Transmission and Distribution Overhead Insulators
The string efficiency of a string of suspension insulators of a 400 kV, 3-phase transmission line is 80%. The voltage across the string is
1
400 kV
2
(400 / √ 3 ) kV
3
(500 / √ 3 ) kV
4
320 kV