U70bla 70kN 220kv Open Air Aerodynamic Disc Glass Insulator for High Voltag
Product Information
Model:U70BSA/U70BLA
U Refers To Disc Suspension Insulator
70 indicates a rated Mechanical failing load of 70kN
B For Ball And Socket Type
S Stands For Short Steel Foot
L Stands For Long Steel Foot
A Aerodynamic design
127/146- indicates that the height of the insulator structure is 127mm, and there are also insulators with spacing of 146mm.
380- indicates that the diameter of the insulator disc is 380mm.
365- indicates that the creepage distance of the insulator is 365mm.
Type: Open profile Toughened Suspension Type
Rated mechanical load: 70kn (about 7 tons)
Purpose: Aerodynamic glass insulators are primarily used in high-voltage transmission lines. Their Aerodynamic design resists strong winds, reduces vibration, prevents ice buildup, and enhances self-cleaning capabilities. They are ideal for harsh weather conditions (e.g., windy or frigid regions), ensuring line stability and safety.
The product model is in accordance with IEC60383-1:1993，MOD / GB/T1001.1
The connection structure is in accordance with GB/T4056-2008(IEC60120:1984,MOD) and BS 3288 part lll.
According to customer requirements, the locking pin can be either W-pin or R-pin.
lf there is no special instruction, W pin is used for U70BA
Product drawing
Product parameters
| IEC designation | Mechanical failing load | Nominal Diameter D | Nominal Spacing P | Creepage distance L | Socket coupling | Wet power frequency withstand voltage | Dry lightning impulse withstand voltage | Power frequency puncture voltage | Net weight |
| kn | mm | mm | mm | mm | kv | kv | kv | kg | |
| U70BSA | 70 | 380 | 127 | 365 | 16 | 45 | 90 | 130 | 5.2 |
| U70BLA | 70 | 380 | 146 | 365 | 16 | 45 | 90 | 130 | 5.3 |
| U100BSA | 100 | 380 | 127 | 365 | 16 | 45 | 90 | 130 | 5.2 |
| U100BLA | 100 | 380 | 146 | 365 | 16 | 45 | 90 | 130 | 5.3 |
| U120BSA | 120 | 380 | 127 | 365 | 16 | 45 | 90 | 130 | 5.2 |
| U120BLA | 120 | 380 | 146 | 365 | 16 | 45 | 90 | 130 | 5.3 |
| U160BSA | 160 | 420 | 146 | 380 | 20 | 50 | 95 | 130 | 7.2 |
| U160BMA | 160 | 420 | 155 | 380 | 20 | 50 | 95 | 130 | 7.3 |
| U210AD | 210 | 420 | 170 | 380 | 20 | 50 | 95 | 130 | 7.3 |
| U240AD | 240 | 420 | 170 | 380 | 20/24 | 50 | 95 | 130 | 7.5 |
| U300AD | 300 | 420 | 195 | 465 | 28 | 50 | 95 | 130 | 12 |
| Power frequency electric arc voltage:0.12s/20ka | |||||||||
| Impulse puncture voltage:2.8 P.U | |||||||||
| Corona visual test :18P/22C kV | |||||||||
| Radio interference voltage(10kV 1MHz):50μv | |||||||||
Suspension insulator components
Suspension insulators consist of the following elements:
- One dielectric made of toughened glass with the appropriate properties and shape for the environmental conditions in which it must function.
- One hot-dip galvanized nodular or ductile malleable cast iron cap.
- One hot-dip galvanized forged steel pin.
- The cap and pin are assembled on the glass piece using aluminous cement with the appropriate properties to withstand the thermomechanical efforts.
Lastly, the insulator cap has a stainless steel or phosphor bronze locking device (split pin) which secures the coupling of the units.
Similarly, the pins may be protected using an anti-corrosion zinc sleeve (sacrificial anode), when requested. This zinc sleeve is strongly recommended for insulators which are going to be used in lines with heavy pollution.
Detailed Photos
