240kN U240B Standard Suspension Glass Disc Insulator for Overhead Transmission Line
Product Information
Model:U240B
U Refers To Disc Suspension Insulator
240 indicates a rated Mechanical failing load of 240kN
B For Ball And Socket Type
170- indicates that the height of the insulator structure is 170mm.
280- indicates that the diameter of the insulator disc is 280mm.
400- indicates that the creepage distance of the insulator is 400mm.
Type: Standard profile Toughened Suspension Type
Rated mechanical load: 240kn (about 24tons)
Purpose: Widely applicable as insulation support for medium and high voltage transmission lines and substation equipment, capable of stable operation under various climatic conditions.
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, R pin is used for U240B.
Product drawing
Product parameters
| IEC designation | U240/170 | |
| Mechanical failing load | kn | 240 |
| Diameter D | mm | 280 |
| Height H | mm | 170 |
| Creepage distance L | mm | 400 |
| Socket coupling | mm | 20/24 |
| Wet power frequency withstand voltage | kv | 45 |
| Dry lightning impulse withstand voltage | kv | 110 |
| Power frequency puncture voltage | kv | 130 |
| Radio interference voltage(10kV 1MHz) | μv | 50 |
| Corona visual test | kv | 18/22 |
| Power frequency electric arc voltage | ka | 0.12s/20Ka |
| Impulse puncture voltage | P.U | 2.8 |
| Net weight per unit | kg | 7.2 |
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.
