Polymeric Pin Insulator – Pole line
Composite pin insulators are more suitable for use in high-pollution areas, have higher mechanical strength, are lighter than porcelain insulators, and require less cleaning and maintenance.
Description
What It Is
A pin‑type polymer insulator mounts directly onto cross‑arms or brackets, supporting medium‑voltage conductors (up to 35 kV). Its one‑piece silicone housing and fiberglass core make it lightweight, hydrophobic, and resistant to tracking.
Key Engineering Features
- Hydrophobic Silicone Housing
– Promotes water beading to prevent leakage currents and flashovers in polluted or coastal environments.
– UV‑stabilized compound retains elasticity and electrical strength over decades. - E‑Glass Fiberglass Core
– Provides high tensile strength (typically 40 kN MBL) and excellent flexibility under wind and ice loading.
– Sealed end fittings (via integral molding) eliminate moisture ingress at the polymer‑to‑metal interface. - Compact Pin Design
– Standard 16 mm galvanized steel pin fits 35 mm cross‑arm holes, no special adaptors required.
– Smooth surfaces prevent contaminant buildup and simplify routine inspections.
Technical Snapshot
| Parameter | Specification |
|---|---|
| Voltage Rating | Up to 35 kV |
| Minimum Breaking Load (MBL) | ≥ 40 kN |
| Housing Material | UV‑resistant silicone rubber |
| Core Rod | E‑glass reinforced epoxy resin |
| Pin Diameter | 16 mm (fits 35 mm brackets) |
| Creepage Distance | 310 – 350 mm (model‑dependent) |
| Standards | IEC 61109, ANSI C29.5 |
Why It Matters
- Lightweight & Easy Handling
At roughly 1.2 kg per unit, one technician can install or replace pins without heavy lifting gear. - Extended Service Life
Silicone’s self‑cleaning properties let you stretch inspection intervals by 25–30% versus porcelain pins. - Cost-Effective Maintenance
Integral molding removes the need for repeated sealing inspections—reducing labor and downtime.
Installation & Best Practices
- Torque Control: Tighten the hex nut to the manufacturer’s spec (usually 10–12 Nm) to ensure a proper seal without overstressing the housing.
- Alignment Check: Make sure the insulator sits perpendicular to the conductor to avoid asymmetric loading.
- Visual Inspections: Even with hydrophobic surfaces, schedule annual checks to confirm pin integrity and look for housing damage.
Related products
Product Test Reports
All our products undergo rigorous mechanical, electrical, and environmental testing according to IEC standards. Below are examples of actual test reports from our laboratory and third-party certifications.
Our Factory
China Energy And Chemical Industry Co., Ltd — 16+ years OEM Transmission Insulator Manufacturer, IEC certified, supplying customers worldwide with polymer, porcelain, and glass insulators.
