Main Dimensions and Mechanical & Electrical Characteristics
Type | U420B/205 | U420BP/205D-1 | U420BP/205D-2 | U420BP/205T |
Fig.No. | 1 | 2 | 3 | 4 |
Nominal Diameter of Insulator D mm | 340 | 380 | 400 | 400 |
Nominal Unit Spacing H mm | 205 | 205 | 205 | 205 |
Nominal Creepage Distance mm | 550 | 550 | 615 | 635 |
Coupling Size mm | 28 | 28 | 28 | 28 |
Rated Electromechanical Failure Load kN | 420 | 420 | 420 | 420 |
Routine Tensile Load kN | 210 | 210 | 210 | 210 |
Wet Power Frequency Withstand Voltage kV | 50 | 50 | 50 | 50 |
Lightning Impulse Withstand Voltage kV | 140 | 140 | 140 | 130 |
Impulse Puncture Voltage (Per Unit Value) | 2.8, 2.85* | 2.8, 2.85* | 2.8, 2.85* | 2.8, 2.85* |
Radio Interference Test Voltage£¨7.5kV ,1MHz£© ¦ÌV | 50 | 50 | 50 | 50 |
Corona Extinguished Voltage kV | Pin18£¬Cap22 | Pin18£¬Cap22 | Pin18£¬Cap22 | Pin18£¬Cap22 |
Power Frequency Arc Test | 0.12s£¬20kA | 0.12s£¬20kA | 0.12s£¬20kA | 0.12s£¬20kA |
Reference Weight Per Unit kg | 23.6 | 22.6 | 23.6 | 24.1 |
Note: Asterisk * only applicable to 1000kV insulators.
