Line Pin (Post) Composite Insulator

Composite Line Post Insulator

Composite line post insulators are a direct replacement for high voltage porcelain or composite insulators. They are designed to meet the dimensional, electrical and mechanical requirements defined in ANSI C29.7 Class 57-3 and ANSI C29.18 Class 51-4F. 
By using ANSI head and neck dimensional standards, the formed ties (for bare or covered conductors) will be easy to install and provide excellent fixing and electrical performance.

Features

Excellent moisture and contaminant shedding due to gradually decreasing shed diameter
UV stabilised material
Dielectric properties matched to the coated conductor
Lightweight design - less than half the weight of aluminium
Aluminium base
Made from a proprietary high density polyethylene based compound

What is a composite line post insulator?

A composite bollard insulator, also known as a polymer bollard insulator, is a bollard insulator consisting of a metal end joint, a glass fibre core and a housing. It has the same function as a porcelain (ceramic) line post insulator - as a support for the power conductor.

Hose
The housing (skirt and sheath) of the composite line pillar insulator is made of a composite (polymeric) material consisting mainly of carefully formulated silicone rubber, Al(OH)3 and filler. This is the main difference between composite line pillar insulators and porcelain line pillar insulators with a shell made of porcelain.

The skirt and sheath have excellent resistance to fouling and flashing, leakage initiation and galvanic corrosion, as well as resistance to atmospheric ageing such as ozone, high and low temperatures. The excellent pollution resistance of composite line pillar insulators is mainly due to the fact that the silicone rubber material is directly related to the long-term ageing of composite line pillar insulators.

In addition, the silicone rubber housing provides an interface to prevent moisture, grease and other materials from potentially penetrating and damaging the core.
Metal end fittings
Metal end fittings are attached to the core to transfer mechanical forces to the other part of the insulator string. Most end fittings are made from hot-dip galvanised forged steel, aluminium alloy, stainless steel etc. The style of end fitting varies depending on the application. The following are some common shapes of composite line post insulator end fittings.

They are also designed to reduce parallel generation stresses in circulating air, they also guarantee the elimination of corona effects and these accessories eliminate possible damage to the rubber and adjacent materials.
Glass fibre cores
The glass fibre core is the load-bearing part of the composite line pillar insulator. In addition to tensile loads, the core is subjected to cantilever loads and is also the main internal insulating part. It requires high mechanical strength, good insulation properties, long-term stability and good insulating properties.

The glass fibre is the skeleton and main body of the mandrel and melts at high temperatures into a cylindrical fibre with a diameter less than or equal to about 1μm and a smooth appearance. Its tensile breaking stress is as high as 1000-1500 MPa. epoxy resin is used as the base material and is cured and moulded by a silicon surface treatment to bond the glass fibres into a single unit, forming an epoxy glass tie rod to bear and transmit mechanical loads.

The housing material is continuous and contains no joints, eliminating electrical shock and corrosion, and the housing is made of carefully formulated silicone rubber. There should be no radial gaskets along the length of this cover and extending into the end fittings to protect the glass rods from moisture and gasket discharge.

These insulators are provided with a vulcanised interface to prevent possible penetration of moisture, grease and other materials and discharge failures, this vulcanised material protects the glass fibre and the rubber cover.

● Application:Fixed to iron cross arm to support conductors and provide mechanical load and insulation;

● Color: Red, Brown, Gray or Customer's requirement;

● Applicable Standard: IEC, GB, BS, ANSI, AS or Customer's requirement;

● Excellent mechanical and electrical properties,

●Hydrophobic properties of the silicone rubber insulation cover ensure high resistance to dirt and self-cleaning properties;

●Lower risk of mechanical damage during transport, assembly and operation;

●Resistance to UV radiation, ozone, moisture;

●Shock and impact resistance – suitable for use in areas of seismic activity;

●Capable of carrying specific torsional loads.

Specification