High Voltage 120kn Disc Suspension Toughened Glass Insulator U120B
Product Design Drawings
Product technical parameters
| IEC designation | U120B/127 | U120B/146 | |
| Diameter D | mm | 255 | 255 |
| Height H | mm | 127 | 146 |
| Creepage distance L | mm | 320 | 320 |
| Socket coupling | mm | 16 | 16 |
| Mechanical failing load | kn | 120 | 120 |
| Mechanical routine test | kn | 60 | 60 |
| Wet power frequency withstand voltage | kv | 40 | 40 |
| Dry lightning impulse withstand voltage | kv | 100 | 100 |
| Impulse puncture voltage | P.U | 2.8 | 2.8 |
| Power frequency puncture voltage | kv | 130 | 130 |
| Radio influence voltage | μv | 50 | 50 |
| Corona visual test | kv | 18/22 | 18/22 |
| Power frequency electric arc voltage | ka | 0.12s/20Ka | 0.12s/20Ka |
| Net weight per unit | kg | 4 | 4 |
Product Application
Product advantages and disadvantages
1. Glass insulator
Advantages: the mechanical strength of the surface layer of glass insulator is high, the surface is not easy to crack, and the aging speed is slow; It can cancel the live periodic preventive test of insulators during operation, and there is no need to carry out "zero value" detection during operation, so the operation and maintenance cost is low.
Disadvantages: due to the transparency of glass, it is easy to find small cracks and various internal defects and damages during appearance inspection.
2. Ceramic insulator
Advantages: good chemical stability and thermal stability, strong anti-aging ability, good electrical and mechanical properties, and flexible assembly.
Disadvantages: defects are not easy to be found, and they begin to be found only after several years of operation; The zero value detection of ceramic insulators must be carried out one by one on the tower, which requires a lot of manpower and material resources; The probability of accidents caused by lightning stroke and pollution flashover is high.
3. Composite insulator
Advantages: small size, easy maintenance; Light weight and easy installation; High mechanical strength, not easy to break; Excellent seismic performance and good pollution resistance; Fast production cycle and high quality stability.
Disadvantages: anti aging capability is not as good as ceramic and glass insulators, and the production cost is higher than that of ceramic and glass insulators.
