33kv electrical line post aislador for station 57-4
| ANSI CLASS | With long stud | 57-1L | 57-2L | 57-3L | 57-4L | 57-5L |
| With short stud | 57-1S | 57-2S | 57-3S | 57-4S | 57-5S |
| Fig. No. | 1 | 2 | 3 | 4 | 5 |
| Creepage Distance (mm) | 356 | 559 | 737 | 1016 | 1143 |
| Dry Arcing Distance (mm) | 165 | 241 | 311 | 368 | 430 |
| Cantilever Strength(kN) | 12.5 | 12.5 | 12.5 | 12.5 | 12.5 |
| Power Frequency | Dry /kV | 70 | 100 | 125 | 140 | 160 |
| Flashover Voltage | Wet/kV | 50 | 70 | 95 | 110 | 130 |
| Critical Impulse | Positive/kV | 120 | 160 | 200 | 230 | 265 |
| Flashover Voltage | Negative/kV | 155 | 205 | 260 | 340 | 380
|
Number Drawing No Main dimensions (mm) Creepage distance (mm)
Lightning impulse withstand voltage (kV) Power frequency wet
flashover voltage (kV) Bending failure load (KN) Base center screw
hole
PS-15/300 2 224 115 300 105 40 3 M16
PS-15/500 1 283 120 360 105 40 5 M16/M18/M20
