A 70 kN anti-fog disc with 146 mm spacing, 280 mm diameter and 450 mm creepage, weighing 5.3 kg. Deep under-ribs hold a dry band when salt fog or chemical film covers the shed.
Mechanical, electrical, radio influence and packing values as tested to IEC 60383 and GB/T 1001.1.
| Mechanical Failing Load | 70 kN |
|---|---|
| Spacing H | 146 mm |
| Diameter D | 280 mm |
| Creepage Distance | 450 mm |
| Ball And Socket Coupling Size | 16 |
| Wet Power-frequency Withstand Voltage | 50 kV |
| Dry Power-frequency Withstand Voltage | 85 kV |
| Dry Lightning Impulse Withstand Voltage | 125 kV |
| Puncture Withstand Voltage | 130 kV |
| Test Voltage RMS To Ground | 10 kV |
| Maximum RIV At 1000 kHz | 50 microvolt |
| Corona Extinction Voltage Pin/Cap | 18/22 kV |
| Power Frequency Arc | 0.12 s / 20 kA |
| Net Weight | 5.3 kg |
A toughened glass disc bonded to a hot-dip galvanized steel cap and steel pin with a zinc sleeve, using high-strength alumina cement cured in a 70 degrees C water bath for about one hour.
Against the U160BSV two-alternating disc, the U70BLP matches creepage at 450 mm but at 70 kN instead of 160 kN and 5.3 kg instead of 8.4 kg. Anti-fog ribs suit wet conductive film, alternating sheds suit dry solid particulate. Match the profile to the deposit type, not only to the pollution class.
Toughening sets the mechanical rating, the thermal shock test removes defective shells, cementing fixes the fittings, and every finished unit is tested before it is packed.
Shells are heated close to the softening point, then high-pressure air jets cool the surface rapidly while the core cools slowly. The surface ends in compression at roughly 100 to 200 MPa with the core in tension, giving four to five times the mechanical strength of ordinary glass.
Shells are heated to about 300 degrees C and plunged into cold water, a drop of roughly 420 degrees C. Any unit carrying internal stress or an inclusion shatters here rather than in service. Survivors move on and the broken glass is recycled as cullet. A second thermal shock test follows to IEC 60383-1 and GB/T 1001.1.
A hot-dip galvanized steel cap, steel pin and zinc sleeve are bonded to the toughened disc with high-strength alumina cement, then cured in a 70 degrees C water bath for about an hour so the cement develops full strength before handling.
Every finished insulator is checked visually for cracks, bubbles, chips and bonding defects, then tested electrically for high-voltage withstand, insulation resistance and partial discharge, mechanically for tensile, bending and torsion strength, and environmentally for thermal cycling, pollution resistance and UV ageing.
Assemble the string with the matching ball and socket coupling size 16 and confirm that the security clip is fully seated on every unit before the string is lifted.
In service, inspect visually on routine patrols. A self-destructed disc is visible from the ground and the steel cap and pin continue to carry mechanical load until replacement. Clean in heavily polluted areas and replace broken units in the next planned outage. No complicated preventive tests are required.
We supply installation manuals, technical drawings and, for large projects, on-site installation guidance and string assembly training.
Mr Andrey from Pradex visited the Jinhao plant in Linyi for a technical review covering the glass shell forming line, the toughening and thermal shock stations, the cementing line and the finished goods inspection area.
A 70 kN standard profile disc with 127 mm spacing, 255 mm diameter and 320 mm creepage, weighing 3.6 kg. The volume workhorse for…
A 160 kN two-alternating disc with 155 mm spacing, 300 mm diameter and 450 mm creepage, weighing 8.4 kg. Alternating shed diameters…
Standard, anti-fog, aerodynamic or alternating. The right answer depends on whether your deposit is a wet conductive film or a dry adherent powder.
450 mm, against 320 mm for the standard profile disc of the same 70 kN rating.
146 mm spacing, 280 mm diameter, 16 ball and socket coupling and 5.3 kg net weight.
50 kV wet power frequency against 40 kV for the standard U70BS, with 85 kV dry power frequency and 125 kV dry lightning impulse withstand voltage.
Yes. We supply customised creepage distance for coastal, industrial and high-pollution environments based on your pollution survey.
Tell us the quantity and destination port. We will confirm lead time, packing configuration and the test report set that ships with the order.
