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Ceramic (porcelain) insulators are made of electrical porcelain, offering stable chemical properties and strong aging resistance with a service life of about 15–25 years – they are the most widely used type. Glass insulators are made of toughened glass, excel in weather aging resistance, and feature a "self-shattering" characteristic that makes defects easy to detect; they show little change in mechanical and electrical performance over 40 years of service. Composite insulators consist of a fiberglass core rod and silicone rubber housing – they are compact, lightweight, and offer excellent anti-pollution flashover performance, making them suitable for heavily polluted areas, though their anti-aging capability is relatively weaker. Selection should be based on voltage level, environmental conditions (pollution class, altitude, coastal salt fog, etc.), and budget.

First determine the system voltage. For 10kV and below distribution lines, ceramic pin insulators are commonly used. For 35kV–220kV transmission lines, disc suspension porcelain or glass insulators are typical. For 500kV and above EHV/UHV lines, composite or rod insulators are more often applied. In addition to voltage, consider creepage distance – for higher pollution areas, choose anti‑pollution types with larger creepage. It is recommended to provide project parameters (voltage, tower type, pollution class, mechanical load) and let the manufacturer's technical team assist with a detailed selection.

Insulator type codes usually consist of letters and numbers indicating material, structure, rated mechanical load, and voltage class. For example, "U70B" – "U" stands for suspension insulator, "70" for rated mechanical failing load of 70 kN, and "B" for anti‑pollution type. Coding may vary among manufacturers, so consult the product catalog or contact the manufacturer's technical staff for interpretation.

Creepage distance is the shortest path along the insulator surface from the high‑voltage end to the low‑voltage (or grounded) end – often called "creepage". It is a key parameter for external insulation performance. A longer creepage distance provides better resistance to pollution flashover. In heavily polluted areas (industrial zones, coastal salt fog), insulators with adequate creepage must be used; otherwise, flashover accidents are likely in damp weather. The ratio of creepage to voltage is the specific creepage distance, an important design reference.

Both are insulation failures but differ essentially. Flashover is a discharge along the external surface (through air or pollution layer); after power is removed, insulation performance can recover automatically, and the insulator itself is usually not permanently damaged. Puncture is a discharge that penetrates the solid insulating material (e.g., porcelain fracture, glass breakage, or core rod carbonization) – causing irreversible permanent damage, and the insulator must be immediately replaced. Flashover can be prevented by cleaning and increasing creepage; puncture is a manufacturing defect or severe aging issue and must be avoided through strict factory testing and regular inspection.

Prices vary significantly by material, voltage class, type, and order quantity, so a single quote is not possible. Main influencing factors: (1) material – composite, glass, or ceramic; (2) voltage class – higher voltage means larger size and higher cost; (3) technical parameters – creepage, mechanical load, anti‑pollution design, etc.; (4) order quantity – bulk orders usually get better pricing; (5) custom requirements – special colors, grading rings, core rod thickening, etc., add cost. Please contact the sales team with specific project parameters and quantities for an accurate quotation.

Yes, samples are available for quality testing and market evaluation. Standard models are often in stock – small orders can ship within 7 working days. Large‑volume or non‑standard custom orders typically require 15–30 days, depending on complexity and order size. Shipping time varies by destination, generally 1–7 days.

Yes, different types and specifications can be combined in one order and shipped in the same container. This helps reduce logistics costs for small‑quantity, multi‑type purchases. Please confirm the mixing plan with the sales team when placing the order.

Store insulators in a dry, ventilated warehouse, protected from water, rain, and rodent/mechanical damage. Before storage, inspect outer packaging for any compression or damage. Do not place heavy objects or items with sharp edges directly on top of insulators to avoid deformation or mechanical injury to the sheds. Stacking height generally should not exceed 8 layers. Composite insulators are especially sensitive to moisture – keep them dry to prevent core rod moisture absorption.

Maintenance includes: (1) regular cleaning – remove surface contaminants to prevent pollution flashover; (2) visual inspection – check for cracks in porcelain, glass self‑shattering, aging or tracking of composite sheds; (3) insulation testing – periodically measure insulation resistance to identify zero‑value or low‑value insulators and replace them. For insulators operating in harsh environments (heavy pollution, heavy lightning) or reaching a certain age (e.g., 10‑15 years), consider sending samples to a laboratory for comprehensive testing.

Self‑shattering is a natural fracture caused by internal stress imbalance in toughened glass – an inherent characteristic of glass insulators. After shattering, the glass disk breaks, making it easily detectable by visual inspection. This self‑shattering is actually an advantage, as failed units become immediately obvious without complex testing. In normal service, the self‑shattering rate of high‑quality glass insulators is very low – the annual degradation rate can be controlled within 0.005% (i.e., less than 5 per 100,000).

We are a manufacturer. In addition, we provide OEM and ODM services for insulator products. We can customize products according to your specifications, including design, material, dimensions, and packaging, to meet your specific project requirements.