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66kV Long Rod Suspension Composite Insulator
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- Product Overview
- Technical Specifications
- Product Structure
- Applications
- Testing Capability
- Packaging & Customization
Product Overview
The 66kV long rod suspension composite insulator is designed to support conductors and provide reliable electrical insulation on high-voltage overhead power lines. Wishpower manufactures this product with a high-strength fiberglass-reinforced epoxy core, silicone rubber housing and corrosion-resistant metal end fittings. Its lightweight construction, mechanical strength, hydrophobic surface and pollution performance make it suitable for conventional transmission networks, coastal regions, polluted environments and renewable energy transmission projects.
Product Overview
The Wishpower 66kV long rod suspension composite insulator is installed between an overhead conductor and a transmission tower. It carries vertical conductor loads, wind-induced loads and specified mechanical tension while electrically isolating the energized conductor from the grounded structure.
Compared with conventional porcelain or glass insulator arrangements, the product offers the following advantages:
High-strength fiberglass core for reliable tensile load performance;
Silicone rubber housing with excellent hydrophobic properties;
Lightweight construction for easier transportation and installation;
Integrated long rod design with fewer intermediate connections;
Customizable creepage distance for different pollution levels;
Multiple end-fitting configurations for different line hardware;
Suitable for new transmission lines and insulation replacement projects.
IEC 61109:2025 covers composite suspension and tension insulators for overhead lines constructed with a fiber-reinforced resin core, polymeric housing and permanently attached metal end fittings. IEC 62217:2025 establishes general definitions, test methods and acceptance criteria for high-voltage polymeric insulators.
Core Features
Reliable Electrical Insulation
The silicone rubber housing and fiberglass core form a complete insulation system suitable for 66kV overhead power applications.Excellent Pollution Performance
The hydrophobic silicone rubber surface helps reduce continuous water-film formation under moisture, salt fog, dust and industrial pollution conditions.High Mechanical Strength
The fiberglass-reinforced epoxy core carries the main mechanical load and can be designed for different specified mechanical load ratings.Lightweight Construction
The composite structure is lighter than comparable porcelain insulation arrangements, reducing transportation and tower installation requirements.Weather and Corrosion Resistance
The housing is designed for outdoor exposure to ultraviolet radiation, rainfall and temperature changes, while galvanized metal fittings provide corrosion protection.Compact Long Rod Design
The integrated structure reduces the number of intermediate components and simplifies the suspension insulation arrangement.Custom Engineering Options
Creepage distance, section length, mechanical rating, shed profile and end fittings can be selected according to project requirements.
Product Structure
The 66kV long rod suspension composite insulator normally consists of the following components:
Fiberglass Core Rod
The glass fiber-reinforced epoxy resin core provides mechanical strength and internal electrical insulation.Silicone Rubber Sheds
The sheds form the external insulation profile and provide the required creepage path.Silicone Rubber Housing
The housing protects the core rod against moisture, pollution, ultraviolet exposure and environmental aging.Metal End Fittings
End fittings connect the insulator to the tower and conductor hardware. Ball, socket, clevis, eye and other configurations are available.End-Sealing System
The interface between the core rod, housing and metal fittings is sealed to reduce the risk of moisture penetration.Grading Hardware
A grading or corona ring may be installed when required by the electric-field distribution and insulation coordination design.
Technical Specifications
| Parameter | Application Range |
|---|---|
| Product name | 66kV long rod suspension composite insulator |
| Product type | Long rod suspension composite insulator |
| Rated system voltage | 66kV |
| Applicable system | AC high-voltage overhead line |
| Specified mechanical load | 70kN, 100kN, 120kN or customized |
| Core material | Fiberglass-reinforced epoxy resin |
| Housing material | High-temperature vulcanized silicone rubber |
| End-fitting material | Forged steel, ductile iron or customized material |
| Surface treatment | Hot-dip galvanizing or specified corrosion protection |
| Structural design | Integrated long rod composite construction |
| Nominal creepage distance | Selected according to pollution level |
| Section length | Customized according to insulation coordination |
| Lightning impulse withstand level | Determined by system insulation requirements |
| Power-frequency wet withstand level | Determined by line design requirements |
| End-fitting options | Ball, socket, clevis, eye or customized type |
| Operating temperature | Typically -40°C to +50°C; customized options available |
| Installation altitude | Normally up to 1,000m; high-altitude design available |
| Pollution conditions | Light, medium, heavy and very heavy pollution |
| Standard color | Grey, red or customized |
| Reference standards | IEC 61109, IEC 62217 or customer specifications |
| Packaging | Wooden case, pallet or export packaging |
| Customization | Creepage distance, load rating, fittings, shed profile and dimensions |
Product Structure
Main Applications
The 66kV long rod suspension composite insulator is suitable for:
66kV high-voltage overhead transmission lines;
Regional transmission and sub-transmission networks;
Power plant and substation incoming or outgoing lines;
66kV wind farm collection and export lines;
Solar power plant transmission lines;
Coastal and salt-fog environments;
Industrial and dusty pollution areas;
Mountainous and high-wind regions;
Insulation upgrading and porcelain replacement projects;
International power transmission and EPC projects.
Testing Capability
Depending on the approved specification and applicable standards, the 66kV long rod composite insulator can be subjected to the following tests:
Visual and dimensional inspection
Verification of section length, creepage distance, shed profile, fitting configuration and surface quality.Mechanical load test
Verification of the insulator’s strength and structural integrity under the specified tensile load.Power-frequency withstand test
Evaluation of insulation performance under specified dry or wet power-frequency voltage.Lightning impulse withstand test
Verification of the insulator’s ability to withstand standardized lightning impulse voltage.Interface and end-fitting test
Evaluation of the mechanical connection and sealing interfaces among the core, housing and metal fittings.Water diffusion test
Assessment of the fiberglass core and insulation system after controlled moisture exposure.Dye penetration test
Detection of capillary channels or internal defects in the fiberglass core rod.Tracking and erosion test
Evaluation of the silicone rubber housing under electrical stress, contamination and moisture.Galvanizing inspection
Verification of the thickness, uniformity and corrosion protection of the galvanized metal fittings.Sealing inspection
Examination of the end-sealing system to reduce the risk of moisture entering the core interface.Sample and routine tests
Mechanical, electrical, dimensional and workmanship checks performed according to the applicable procurement specification.
Packaging & Transportation
To keep products safe during transportation and storage, we use the following packaging methods:
- Individual Packaging: Each product is wrapped with protective film, packed in a high-strength carton, and cushioned with buffer materials.
- Pallet Packaging: Multiple products are fixed on wooden pallets and wrapped with stretch film, suitable for container shipping.
- Export Packaging: Fumigated wooden cases, moisture-proof treatment, and detailed packing lists are provided according to sea freight requirements.
Customization Service
WishPower can provide the following customization options according to customer requirements:
- Structural Dimensions: Adjust overall height, creepage distance, shed quantity, and shed diameter.
- End Fittings: Customize ball-socket, tongue-clevis, eye, or other interface types according to connection requirements.
- Color: Standard gray, with red, yellow, blue, and other colors available subject to MOQ.
- Special Environments: Formulations for extreme cold (-60 C), strong UV exposure, heavy pollution, and other harsh conditions.
- Voltage Classes: Full-range customization from 10kV to 1000kV.
- Marking: Customer logos or model numbers can be molded or printed on the product.
For specific customization requirements, please contact our sales engineers. We will provide a technical solution within 24 hours.
FAQ
Q: What standards can your products meet?
A: Our products can be designed and tested according to IEC, ANSI, GB and customer-specific technical requirements.
Q: Can you provide customized insulation products?
A: Yes. WishPower supports customized voltage ratings, creepage distances, fittings, colors and drawings according to project requirements.
Q: Are composite insulators suitable for coastal areas?
A: Yes. Composite insulators with silicone rubber housing provide good hydrophobicity and anti-pollution performance, making them suitable for coastal and polluted environments.
Q: What information should I provide for a quotation?
A: Please provide voltage level, product type, quantity, application environment, standard, drawings or technical specifications if available.
Q: How do I choose the right composite insulator for my project?
A: You can provide voltage level, installation type, mechanical load, creepage distance and operating environment. Our team will recommend the suitable model.
