Fog Type Glass Disc Suspension Insulator is specifically engineered for overhead transmission lines operating in high contamination environments such as coastal regions, desert areas, and industrial zones. The anti-pollution profile design increases creepage distance and enhances surface performance under salt fog, dust accumulation, and high humidity conditions.
Electric Powertek manufactures glass insulators for long-term reliability in demanding grid infrastructure projects worldwide.
Transmission systems in coastal regions and heavy industrial zones face continuous exposure to salt spray, airborne particles, and moisture. Utilities and grid operators such as National Grid and State Grid Corporation of China require insulators that maintain dielectric integrity under pollution stress.
Fog type profiles are developed to:
Increase effective creepage distance
Reduce surface leakage current under wet contamination
Minimize flashover risk during fog or salt mist conditions
Maintain stable insulation performance in strong wind areas
This makes them suitable for 132kV, 220kV, and higher voltage transmission networks in severe environmental conditions.
The fog type shed profile differs from standard disc designs by providing:
Larger and deeper shed geometry
Extended leakage path
Improved self-cleaning characteristics under rain
Reduced contamination bridging effect
These features significantly improve performance in:
Coastal transmission corridors
Offshore wind farm grid connections
Desert and sandstorm regions
Heavy industrial pollution zones
Chemical and petrochemical plant power systems
For EPC contractors managing long-distance transmission line construction, using fog type insulators reduces long-term maintenance risk and improves system reliability.
The insulator adopts a cap and pin ball-and-socket configuration, allowing modular string assembly for different voltage classes.
Main components include:
Toughened low-alkali glass dielectric unit
Hot-dip galvanized high-strength cast iron cap
Zinc-coated forged steel pin
Stainless steel locking device
Cement bonding with controlled thermal curing
This structure ensures:
High mechanical tensile strength
Reliable string articulation under wind load
Safe conductor support in long-span applications
Compatibility with international hardware standards
Compared with porcelain alternatives, toughened glass provides:
If internal failure occurs, the glass disc shatters visibly while remaining mechanically connected. This allows rapid inspection by transmission line maintenance teams.
The tempering process increases impact resistance and load-bearing capacity, suitable for heavy conductor systems.
Low-alkali glass ensures consistent dielectric performance and resistance to aging.
These characteristics make fog type glass insulators a preferred solution in new transmission projects and grid upgrade programs.
Major transmission projects executed by EPC contractors such as Power Construction Corporation of China and global energy solution providers like Siemens Energy require stable supply chains and consistent product quality.
Electric Powertek supports project-scale procurement with:
Stable bulk production capacity
Strict dimensional consistency
Mechanical and electrical routine testing
Galvanization thickness inspection
Export-compliant packaging
Full test reports and documentation
For distributors and importers, mixed container loading and customized labeling are available.
Fog type glass disc suspension insulators are typically applied in:
69kV transmission lines
110kV–132kV systems
220kV overhead networks
330kV and above high voltage corridors
Disc units can be configured into suspension strings based on insulation coordination design and environmental pollution level.
Integrated R&D, manufacturing, and export capability
Experience supplying global transmission markets
One-stop solution for insulators and overhead line fittings
Strict quality control and international standard compliance
Efficient support for large-volume infrastructure projects
Fog Type Glass Disc Suspension Insulator is a reliable solution for high contamination transmission environments where long-term insulation performance and mechanical safety are essential.
Glass insulator is a device used to support and insulate electrical wires. It is made from toughened glass, which enhances its strength and durability.
Currently, toughened glass insulators are among the most widely used insulators in power lines due to their excellent electrical insulation properties and mechanical strength.
ANTIFOULING(FOG) GLASS INSULATOR
Antifouling(Fog) type profiles must be used in the coast areas exposed to sea spray or very strong wind.
INSULATORS COMPONENTS
Cap and pin type of suspension glass insulator consists of the following elements: insulating part (or dielectric), pin, cap and locking device.
A locking device is a part of insulator for fixation and is manufactured of stainless steel. The assembling of an insulator is performed by cement-send mix followed by thermal wet treatment. The assembling may be performed with Portland cement or aluminosilicate cement.
A cap is for movable fixation of an insulator to another one or fittings. Caps are produced by casting from high-strength cast iron or malleable cast iron.They are made in the method of hot-dip galvanizing method to ensure its corrosion-resistant property.
Caps for DC insulators are equipped with a collar made by casting.
The insulating part is manufactured by the compaction method from low-alkali glass followed by toughening.
TECHNICAL PARAMETER
Glass insulators are a crucial component in the insulation and support of overhead transmission lines. In the early years, insulators were primarily used on power poles. However, their usages evolve to include high-voltage power line connection towers, where multiple disc-shaped insulators are hung at one end to increase the creepage distance. These insulators are commonly made of glass and are vital for maintaining insulation in power transmission systems.
ADVANTAGES OF GLASS INSULATOR
Raw Material:
Made of tempered(toughened)glass, which is more stable compared to materials used for porcelain insulators.
Suitable for various weather conditions; waterproof and moisture-proof.
Able to function normally in rainy or humid environments.
Appearance:
Glass transparency makes it easier to detect small cracks, internal defects, or damages during visual inspections.
Performance:
Excellent insulation performance and reliable operation.
High hardness, resistance to bending, and effective anti-fouling properties.
Strong mechanical and electrical performance, small size, lightweight, and long service life.
Mechanical Strength:
High mechanical strength, especially on the surface, which is resistant to cracks and slow aging.
Ease of Testing:
Preventive testing can be minimized since any damage to the glass is easily detectable during line inspections, allowing operators to identify problems visually.
Self-Cleaning Properties:
Glass insulators have smooth surfaces, which reduce the accumulation of dirt, dust, and pollutants, especially in outdoor environments. Rainwater naturally helps clean the surface, maintaining performance.
Resistant to Weathering:
Glass insulators have excellent resistance to UV radiation and other environmental factors, maintaining their strength and transparency over time without degradation.
Thermal Stability:
Glass has good thermal properties, meaning it can withstand extreme temperature variations without cracking or losing insulation properties.
Resistance to Corrosion:
Glass is highly resistant to corrosion, especially in harsh industrial or coastal environments, unlike metal components that can degrade due to chemical exposure.
Safety Factor:
In case of damage, glass insulators tend to shatter into small, blunt pieces rather than large, sharp shards. This makes them safer to handle and reduces the risk of injury during maintenance or replacement.
Environmental Friendliness:
Glass is a recyclable material, and glass insulators have a lower environmental impact in terms of disposal compared to other materials like plastics or certain ceramics.
Long-Term Cost Efficiency:
Due to their long service life and reduced need for regular preventive testing or cleaning, glass insulators can offer lower maintenance costs over time compared to other insulator types.
Coastal grid expansion projects
Offshore wind farm transmission lines
Desert and high dust regions
Industrial power supply systems
Rural electrification in harsh climates
Testing
Packing&Delivery
Cooperative Client
Our cooperative client are all over the world and our products are very popular all over the world. Many products are exported to Russia, USA, Australia, Canada, South Africa, Kenya, Tanzania, Zambia, Brazil and Argentina. Chile, Southeast Asian countries and other international markets. With first-class technical ability and perfect pre-sale and after-sales service guarantee system, we have established a good reputation between enterprises and users.
FAQ
Q: Do you provide sample service?
A: Yes, we only provide samples and ask for one piece at a time. The freight should be borne by you.
Q: Do you support customized services？
A: Yes, we can customize the size and logo according to your needs. Please consult the customer service for the specific minimum order quantity.
Q: How is the Design & Engineering?
A: Experienced and skilled team of designers including CAD designers and 3D designers has the capacity to deliver outstanding designs for your project. If you require more complex engineering of structures such as overhead transmission and distribution lines design,we can also provide this service also designer fee .
Q: What's the payment term?
A: We accept T/T, L/C, West Union.
Q: What's the delivery time?
A: Usually within 7-15 days according to quantities
Q: What's the standard of package?
A: Export standard package or special package as the requirement of customers.
Q: What kind of product quality your factory offer?
A: Our products with both excellent quality and competitive price. And we offer free sample for your reference.
Q: What kind of certificate you have?
A: We have ISO9001:2008
