Glass disc insulator
Description
What It Is
A glass disc insulator consists of a tempered glass “doughnut” with a metal cap and pin. Discs are strung together into “insulator strings” to achieve the required voltage withstand. Their transparency and mechanical strength make them a trusted choice on overhead lines worldwide.
Core Features
- High Mechanical Strength
Each disc is tested to break at loads ≥ 80 kN, ensuring the string carries conductor tension, ice, and wind loads with ample safety margin. - Optical Clarity for Visual Inspection
The clear glass allows maintenance crews to spot chips, cracks, or surface contamination at a glance—no special tools needed. - Stable Aging Performance
Tempered glass resists UV degradation and maintains dielectric properties over decades, reducing the need for live‑line testing. - Low Thermal Expansion
Glass’s minimal expansion keeps the metal‑to‑glass seal tight over wide temperature swings, preventing moisture ingress and flashovers.
Technical Snapshot
| Parameter | Specification |
|---|---|
| Voltage Class | 69 – 500 kV |
| Minimum Mechanical Load | ≥ 80 kN per disc |
| Disc Diameter | 180 mm – 330 mm (model‑dependent) |
| Creepage Distance | 320 – 680 mm |
| Material | Soda‑lime tempered glass |
| Metal Fittings | Hot‑dip galvanized steel or brass |
| Standard Compliance | IEC 60383, ANSI C29.6 |
Why Choose Glass Disc?
- Instant Fault Detection
A simple visual check can reveal surface defects—saving hours on live‑line inspections. - Long Service Life
Glass insulators routinely exceed 30 years in service without significant loss of strength or insulation. - Cost‑Effective Maintenance
With no polymer housing to degrade, you avoid replacement costs tied to UV or ozone damage.
Installation Tips
- Torque the Pin Correctly: Use a calibrated torque wrench on cap‑pin joints to manufacturer specs (typically 15–20 Nm) to preserve the glass‑to‑metal seal.
- String Handling: Always lift strings by the metal fittings—never by the glass itself—to prevent micro‑cracks.
- Routine Cleaning: In coastal or industrial zones, schedule washed‑line cleaning every 2–3 years to remove salt and grime and keep creepage distance optimal.
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.
