Composite Deadend Insulator
Definition and Purpose
A Composite Deadend Insulator is a high-performance electrical insulator used in overhead power lines to simultaneously anchor (deadend) a conductor (e.g., at a pole, tower, or structure) and electrically isolate it from the grounded support. It combines mechanical strength with electrical insulation properties, designed to handle both the tensile forces of the conductor (e.g., from line tension, wind, or ice) and voltage stresses in harsh environments.
Polymer terminal insulators are used to provide electrical insulation between phase conductors and the ground. They are particularly suitable for spacer cable or tree line systems. When fixing terminal insulators on Hendrix terminal brackets, it is recommended to use shackles.
Function: It serves as both a mechanical anchor (deadend) and an electrical insulator.
Mechanical Role: Terminates or anchors a power line at a pole or tower, handling high tensile forces caused by conductor tension.
Electrical Role: Prevents unwanted current flow to the support structure, ensuring safe insulation even under environmental stress.
Structure
Core: Typically a fiberglass-reinforced epoxy resin rod, providing high tensile strength to withstand mechanical loads.
Weathershed Housing: Made of silicone rubber or ethylene propylene diene monomer (EPDM). This layer:
- Protects the core from environmental factors (UV, moisture, pollution).
- Features a hydrophobic surface to repel water, reducing leakage currents and flashovers.
End Fittings: Metal components (e.g., forged steel) at both ends for attaching the insulator to the conductor and support structure.
Advantages Over Traditional Insulators:
Lightweight
Easier to handle and install compared to porcelain/glass.
01
Durability
Resists cracking, corrosion, and vandalism.
02
Environmental Resistance
Performs well in polluted, coastal, or humid areas due to hydrophobic properties.
03
High Strength-to-Weight Ratio
Ideal for long spans and high-tension applications.
04
Low Maintenance
Reduced risk of contamination buildup.
05
By addressing both mechanical anchoring and electrical insulation, composite deadend insulators are critical for modern, reliable power grids in diverse conditions.
Applications of Composite Deadend Insulator
Composite Deadend Insulators are widely used in electrical power systems due to their unique blend of mechanical strength and electrical insulation properties.
Overhead Transmission Lines
- Line Termination: Anchor and electrically isolate conductors at termination points (poles, towers, or substations).
- Angle/Tension Points: Secure lines at directional changes (e.g., corners, river crossings) where mechanical tension is high.
- Long Spans: Support long-span installations (e.g., valleys, highways) due to their high tensile strength-to-weight ratio.
Harsh Environmental Conditions
- Coastal Areas: Resist salt fog and moisture-induced corrosion, preventing flashovers.
- Industrial Zones: Withstand pollution (dust, chemicals, smog) that degrades traditional insulators.
- High-Altitude/Icy Regions: Perform reliably in freezing temperatures and heavy ice loads.
Urban and Suburban Distribution Networks
- Compact Spaces: Lightweight design suits dense urban areas with limited structural support.
- Pollution Resistance: Ideal for cities with high levels of airborne contaminants (e.g., traffic exhaust).
Renewable Energy Projects
- Wind Farms: Anchor transmission lines in corrosive offshore or coastal environments.
- Solar Farms: Handle high-tension conductors in desert regions prone to sandstorms and UV exposure.
Railway Electrification
Catenary Systems: Insulate and anchor overhead lines for electric trains, offering vibration resistance and durability.
High-Voltage Direct Current (HVDC) Systems
DC Transmission: Preferred over porcelain in HVDC lines due to better performance under continuous DC stress.
Temporary Installations/Emergency Repairs
Quick Deployment: Lightweight and easy to install for restoring power after storms or disasters.
Seismic Zones
Flexibility: Absorb vibrations and mechanical shocks during earthquakes, reducing failure risks.
Wildlife Protection
Animal Guards: Some designs include features to prevent bird collisions or electrocution.
different types of Composite Deadend Insulator
25kV Railway Composite Polymer Insulator For Train Insulation
Double Insulation-Composite Railway Insulator
These insulators are commonly used in overhead transmission lines, particularly in areas where durability and resistance to harsh conditions are crucial. The "double" aspect might refer to either a twin-unit configuration or the use of double composite materials for enhanced strength and reliability.
This type of insulator is crucial for maintaining the integrity of power lines by providing excellent electrical insulation and mechanical support.
66kV120kN Power Composite Tension Insulator For Distribution Line
Strain insulators are commonly constructed from fiberglass, a material known for its resistance to ultraviolet (UV) radiation, moisture, and elevated temperatures. These insulators are specifically engineered to provide electrical separation between the pole and the guy wire, thereby enhancing safety and ensuring system reliability.
24kV 80kN Silicone Rubber Composite Tension Insulator For Distribution Line
Connection structure of cord and endfitting
The connection structure between the mandrel and the hardware has progressed from early designs featuring internal wedges, external wedges, and adhesive methods to a more advanced crimping structure. This modern configuration significantly enhances the stability of the connection strength between the hardware and the mandrel, resulting in minimal dispersion.
Why choose us
Wuhan Line Power Transmission Equipment Co., Ltd. stands at the forefront of innovation in the realm of high voltage transmission power composite insulator series products. Our cutting-edge technologies have been cultivated through fruitful collaborations with renowned scientific and research institutions, including Wuhan University (previously known as Wuhan University of Water and Electricity), Hubei Institute of Chemical and Industry, and Wuhan High Pressure Research Institution. These partnerships have been instrumental in propelling our advancements in research, development, and the subsequent production and sales of our high-quality insulator series.
The company products are covering composite station post insulators with electricity voltage from 72.5kV to 252kV, strength grade from 10kN to 20kN; the overhead line composite insulators with AC electricity class from 10kV to 1000kV and DC from 400kV to 1100 kV which strength grade from 70kN to 1000kN; and electrified railway composite insulators which includes long rod suspension 100 (120)kN and 160kN in ordinary type, reinforced type, highland type and double insulation type, and long rod post 8kN,12kN,16kN in ordinary type, reinforced type, highland type and double insulation type. All specifications and models have past the domestic or international test, whose comprehensive technical performance is in the leading place of the world.
Production Equipment
We have six workshops and the total area is 30,000 square meters. Our company owns the most advanced 18000cc full automatic overall injection molding machines and the voice-operated displacement crimping machines. Our company built up a high voltage testing hall with 1000 kV power frequency experimental transformer, 600kV steep shock wave test machine,1800kV impulse voltage generator set, 40kN.m bending torsion testing machine, 2000kN tensile testing machine etc.., and physical & chemical laboratory, electrical laboratory with complete set of equipment, and the testing area is up to 2,000 ㎡. We have the ability of inspecting the raw material and insulators, and performing routine test, sample test and most of the type test.
The Package
All goods are packed in weatherproof containers to protect them during land, air and sea transportation. Several different grades of packaging can be offered depending on the mode of transport and the expected storage conditions. Special packaging can be made. Normally we use plywood case, solid wood case or the cartons for the packing.
our services
24 Hours Quick reply
We value your inquiry very much and will make quick response. Any kind of technical support are available for users.
Customized Product
Welcome to provide your drawings or technical data for customization and free marking service can be provided. Our products are certified by IEC / ANSI / GB / ISO9001 and 24 months warranty after goods arrival can be provided.
Sample/OEM
Samples or OEM will be provided if necessary.
Bid Tender
we have 11 years' experience on international and national Tender Bidding.
Strict Quality Control of Production
Adopt advanced testing equipment, such as: 1000kV power frequency testing transformer, 1800kV impulse voltage generator set, 2000kN automatic tensile test machine which ensures the excellent quality of our goods.
Insulator Parts
All Parts Available in lifetime use.
related products
Find professional composite deadend insulator manufacturers and suppliers in China here. With more than 10 years' experience, we warmly welcome you to wholesale high quality composite deadend insulator for sale here from our factory. Good service and competitive price are available.
25kV DS Insulator, 25kV Composite Deadend insulators, Polymer Deadend Insulator