Diameter: 255mm | Height: 146mm | Creepage distance:320mm
U70BL is a glass insulator used for high-voltage transmission lines
Material: Tempered glass
Rated mechanical load: 70kN (approximately 7 tons)
Rated voltage: usually used for voltage levels of 35kV and above
Structure: Suspended structure, composed of iron cap, tempered glass umbrella plate, and steel feet
| IEC designation |
U70BS/127 |
U70BL/146 |
| Mechanical failing load |
kn |
70 |
70 |
| Diameter D |
mm |
255 |
255 |
| Height H |
mm |
127 |
146 |
| Creepage distance L |
mm |
320 |
320 |
| Socket coupling |
mm |
16 |
16 |
| Wet power frequency withstand voltage |
kv |
40 |
40 |
| Dry lightning impulse withstand voltage |
kv |
100 |
100 |
| Power frequency puncture voltage |
kv |
130 |
130 |
| Radio interference voltage(10kV 1MHz) |
μv |
50 |
50 |
| Corona visual test |
kv |
18/22 |
18/22 |
| Power frequency electric arc voltage |
ka |
0.12s/20kA |
0.12s/20kA |
| Impulse puncture voltage |
P.U |
2.8 |
2.8 |
| Net weight per unit |
kg |
3.5 |
3.6 |
Advantages and Characteristics
Zero value self explosion characteristic, easy to detect faults during inspection
Good stain resistance (depending on specific design)
High mechanic strength
long service life
application area
Mainly used for high-voltage transmission lines, especially for high voltage and ultra-high voltage transmission lines that require high mechanical strength in sections and areas with high pollution levels (depending on the specific design)
Jiangxi QOCI Electric Co.,Ltd.has been specialized in research and development of latest high-strength functional glass and power transmission insulators,which is the qualified supplier for State Grid Corporation of China and Southern State Grid Corporation of China,and is a participating unit of product standard formulation of the National Insulator Standard Committee.The main products type are :standard-type insulator,antipollution-type insulator,aerodynamic type insulator,multi-umbrella type insulator,ground-wires type insulator,post insulator for line,pin insulator.Products are mainly used for transmission line insulation, suspension, support, tension conductors.Our products are divided into 5 major series: the standard type 40-550kN,filth-resistant type 70-420kN,aerodynamic type 120-300kN,multi-umbrella type 120-300kN,and ground circuit type,able to be used for line voltage from 10kV~1000kV.
Why choose us?
1.Source factory, self-produced and self sold, low price.
2.More than ten years of operation, quality assurance.
Audited Supplier 
){kind=link}