57 Series Line Post Insulators use ceramic glaze and galvanized steel fittings for overhead line insulation and support.
WANGYUAN 57 Series Tie Top Type Line Post Insulators are designed for conductor insulation and support in low and medium voltage overhead distribution systems. Made of high-grade electrical ceramic with a dense glazed surface and fitted with hot-dip galvanized steel fittings, the tie-top structure enables secure conductor fixing via binding wires. Available in brown and white glaze with full specifications, all products comply with relevant international power standards, maintaining reliable performance in harsh outdoor environments.
| ANSI CLASS | 57-1 | 57-2 | 57-3 | 57-4 |
|---|---|---|---|---|
| Creepage Distance, mm | 356 | 559 | 737 | 1015 |
| Dry Arcing Distance, mm | 165 | 241 | 311 | 368 |
| Cantilever Strength, kN | 12.5 | 12.5 | 12.5 | 12.5 |
| Power Frequency Flashover – Dry, kV | 70 | 100 | 125 | 140 |
| Power Frequency Flashover – Wet, kV | 50 | 70 | 95 | 110 |
| Critical Impulse Flashover Voltage – Pos, kV | 120 | 160 | 200 | 230 |
| Test Voltage to Ground, kV | 15 | 22 | 30 | 44 |
| Maximum RIV at 1000KHZ, µv | 100 | 100 | 200 | 200 |
| Net Weight, kgs | 4.8 | 7.8 | 11.0 | 18.0 |
High-purity electrical ceramic with dense glazing ensures stable dielectric strength, effectively isolating live conductors and suppressing leakage current, guaranteeing safe and stable operation of distribution lines.
Fired at high temperature with a compact internal structure, paired with reinforced hot-dip galvanized steel spindle, it delivers outstanding bending and tensile strength, stably withstands conductor tension and external mechanical stress.
The dense glazed surface features excellent UV resistance, pollution resistance and corrosion resistance, adapting to high temperature, high humidity, coastal salt spray and other harsh outdoor conditions, with extended service life.
The tie-top design matches standard binding wires for firm and reliable conductor fixation; standard mounting dimensions fit common line hardware, enabling convenient and efficient on-site assembly.
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