FQX/FQB Series Composite Long-Rod Insulator
FQX/FQB Series 25~27.5kV
Specifications
| Model | FQX/FQB |
|---|---|
| Standard | GB/T 11030-2008, TB/T 3199 series “Insulators for electrified railway overhead contact system” |
| Rated Voltage | 25 kV overhead contact system |
| Operating Temperature | -40℃~+70℃ |
| Altitude | <4000m |
| Materials | High-strength porcelain insulating body or composite silicone, steel foot with zinc sleeve |
| Installation | Suspended on support cantilevers, positioning points and anchor points |
Composite long-rod insulators use a silicone-rubber shed over a fibre-glass core rod, offering light weight, good anti-pollution performance and no need for periodic cleaning, to standard TB/T 3199.2-2018. Model designation: FQ — composite insulator; X — suspension type; B — long rod. Lightning impulse withstand voltage ≥270~310kV, dry power-frequency withstand voltage ≥160~190kV.
| Model | Rated voltage | Structure height (mm) | Minimum arc distance (mm) | Minimum nominal creepage distance (mm) | Rated load |
|---|---|---|---|---|---|
| FQX1-25/100 | 25kV | 700±20 | 500 | 1600 | Tension 100kN |
| FQX2-25/100 | 25kV | 700±20 | 500 | 1200 | Tension 100kN |
| FQB-25/40 | 25kV | 700±20 | 500 | 1200 | Bending 40kN |
| FQB-25/8 | 25kV | 850±20 | 490 | 1200/150 | Bending 8kN |
| FQB-25/12 | 25kV | 760±20 | 520 | 1400 | Bending 12kN |
Other common composite insulator models:long-rod suspension single insulation: FQX-25/100QT, FQX-25/100QH, FQX-25/120QT; long-rod suspension positioning: FQD-27.5/100HY, FQDJ-27.5/100HY; long-rod post type: FQZ-27.5/16-160. Model example: FQBS27.5/16-1600 denotes a cantilever insulator with double insulation, 27.5kV, 16kN bending load and 1600mm creepage distance.
Performance
Operating Conditions
Suitable for sections with different pollution levels; simultaneously withstands mechanical loads and electrical insulation stresses.
Mechanical Performance
Full range of 8–20 kN bending loads; every porcelain unit undergoes a mechanical load test. The composite version withstands impacts without breaking.
Electrical Performance
Dry and wet power-frequency withstand voltages, lightning impulse withstand voltage and creepage distance meet the requirements of TB/T 3199; the double-insulation type offers higher reliability.
Applications
Suspension on main-line support cantilevers
On main-line support cantilevers, composite rod insulators isolate the live components from the pole.
Coastal sections with severe pollution
In severely polluted coastal sections, composite rod insulators with a long creepage distance are used to prevent pollution flashover.
Insulation at anchor points
At anchor points, the composite rod insulator simultaneously withstands the tension and the insulation stress.
Extreme cold regions
In extreme cold sections, the units of composite rod insulators maintain stable frost and thaw resistance.
