Long Rod Suspension Insulator

SARAH durable Long Rod Suspension Insulator is a new generation of power insulation product that replaces traditional porcelain/glass suspension insulators. It is widely used in high-voltage, ultra-high voltage, and extra high voltage overhead transmission lines to suspend conductors and achieve electrical insulation and mechanical fixation.

The product adopts the integral molding process, and the core rod, umbrella skirt, and hardware are integrated for sealing, completely eliminating the risk of interface breakdown; Silicone rubber material has excellent hydrophobicity, pollution flashover resistance, and aging resistance. Under complex working conditions such as high humidity, high salt fog, and heavy pollution, its insulation performance is far superior to traditional porcelain insulators, greatly reducing the operation and maintenance cost of the line.

Full range models and core parameters

Our Long Rod Suspension Insulator covers the full voltage range from 12kV low-voltage distribution network to 550kV ultra-high voltage transmission, meeting the insulation and mechanical requirements of different line scenarios. The core model parameters are as follows:

Advantages

The umbrella skirt structure optimizes the creepage path, with a maximum creepage distance of 12250mm, effectively suppressing pollution flashover and wet flashover, and ensuring stable operation in heavily polluted areas;

The lightning impulse withstand voltage of the entire series of products covers 95kV-2250kV, meeting the lightning protection requirements of different voltage levels of lines and significantly reducing the lightning trip rate;

A stable hydrophobic film is formed on the surface of the material, and rainwater quickly slides off without forming a continuous water film. The wet insulation performance far exceeds that of ceramic insulators.

The Long Rod Suspension Insulator adopts epoxy glass fiber pull rods, with a tensile strength more than 5 times that of ordinary steel, and a rated mechanical load covering 70kN-210kN, meeting harsh working conditions such as large spans and heavy ice areas;

The metal fittings and core rods are bonded using an integral compression process, with a strength far exceeding the national standard requirements, and there is no risk of loosening or slipping during long-term operation;

The Long Rod Suspension Insulator has passed millions of vibration fatigue tests and is suitable for long-term wind and vibration conditions on the line, with a service life of over 30 years.

Silicone rubber material has undergone high and low temperature cycling at -40 ℃~+80 ℃, UV aging, and salt spray corrosion testing, making it suitable for various complex environments such as plateaus, coastal areas, and chemical zones;

The weight is only 1/5~1/10 of porcelain insulators of the same voltage level, significantly reducing tower loads, reducing transportation and installation costs, and improving construction efficiency by more than 50%;

The product has no zero value self explosion risk, no need for regular zero value testing, and reduces operation and maintenance costs by 80%, making it an ideal choice for smart grids.

Integrated vulcanization molding of core rod, umbrella skirt, and metal fittings, completely eliminating interface air gaps and eliminating potential interface breakdown hazards;

From the raw materials entering the factory to the finished products leaving the factory, each batch of products undergoes full testing including power frequency withstand voltage, mechanical stretching, and steep wave impact, and is 100% qualified before leaving the factory;

The product complies with domestic and international standards such as IEC 61109 and GB/T 19519, and has passed authoritative third-party testing and certification. It can be directly used in various power engineering projects worldwide.

Applicable scenarios

Suspension insulation for 10kV-500kV overhead transmission lines;

Network and rural power grid renovation projects;

High altitude, heavy pollution, high salt spray and other special operating conditions lines;

Lines with strict mechanical requirements such as large spans and heavy ice areas;

Insulation of busbars in converter stations and substations;

Insulation of railway and rail transit power supply lines.

Company strength and shipment guarantee

Enterprise Strength

SARAH Electric is a professional domestic enterprise engaged in the research and development, production, and export of high-voltage composite insulators, with over 20 years of industry experience. It has built its own modern production base, equipped with internationally advanced vulcanization production lines and mechanical/electrical testing laboratories. Its core technical team comes from top universities in the power industry and has multiple independent research and development patents.

We are a qualified supplier of State Grid and Southern Power Grid, with products exported to more than 30 countries and regions worldwide. We have served over 1000 power engineering projects and have gained unanimous recognition from global customers for our stable product quality and efficient delivery capabilities.

Shipment and Service Guarantee

Regular models of the entire series are in stock, mainstream models of 12kV-220kV can be shipped within 48 hours, and ultra-high voltage models of 330kV-500kV can be delivered quickly within 7-15 days;

Support customization of hardware structure, umbrella shape, creepage distance and other parameters, and can be developed and produced exclusively according to customer drawings and working conditions requirements;

High voltage composite insulators have complete export qualifications, can provide CE, ISO and other certifications, support FOB/CIF and other trade terms, and efficient global logistics distribution.

FAQ

Q1: What is the difference between composite insulators and traditional ceramic insulators?

A: The core difference lies in the three dimensions of material, performance, and operation and maintenance: composite insulators use silicone rubber and epoxy core rods, which are lighter in weight, more resistant to pollution and flashover, and maintenance free; Ceramic insulators are heavy, prone to breakage, and require regular zero value testing, resulting in high maintenance costs. In heavily polluted and high humidity areas, the insulation reliability of composite insulators far exceeds that of ceramic insulators.

Q2: How to choose the appropriate insulator model for your own line?

A: The selection core depends on three parameters: rated voltage, rated mechanical load, and creepage distance. Match the rated voltage according to the voltage level of the line, match the mechanical load according to the weight, span, and ice wind load of the wire, and match the creepage distance according to the local pollution level. Our technical team can provide you with free selection solutions. Please feel free to consult.

Q3: What is the service life of the product?

A: Under normal operating conditions, the design service life of composite suspension insulators is ≥ 30 years. Through accelerated aging testing verification, the long-term operational performance is stable and does not require intermediate replacement.