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Composite Station Post Insulator

Composite Station Post Insulators are polymer-based substation insulators designed to provide both electrical insulation and mechanical support under service loads. Covered by IEC 62231 and IEC 62231-1 for AC systems above 1,000 V up to 245 kV, they typically consist of a resin-impregnated fiber load-bearing core, a silicone or EPR housing, and permanently attached end fittings. In substations, they are commonly used for busbar supports, reactors, and disconnectors where high mechanical strength, cantilever performance, creepage distance, and impulse withstand capability are required, making them a compact and lightweight alternative to traditional rigid insulators.

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Product Accessories

Corona rings are used on higher-voltage station post assemblies to control electric-field stress and help meet RIV performance; notes that some 1800 kV and 2050 kV BIL station-post applications may require corona rings depending on the installation.

Base mount and flange hardware are part of the station-post mounting package, and Welldone Power specifies station-post units with two base mount ends in accordance with AS 4398.1.

Galvanized cap screws, threaded inserts, and metal fixing parts are commonly supplied with the assembly to secure the insulator to the structure and equipment frame; notes that caps and flanges are made from drop-forged steel, malleable iron, or ductile iron and are hot-dip galvanized.

Special shed-profile options can be selected for polluted, coastal, or heavy-icing environments, and states that alternative petticoat profiles are available to meet specific customer requirements.

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Product Specifications

Product type

Composite station post insulator for substation use.

Standard basis

IEC 62231 / IEC 62231-1 for dimensional, mechanical, and electrical characteristics.

Service voltage scope under IEC

AC systems greater than 1,000 V up to 245 kV.

Manufacturer voltage scope

product families published from 45 to 550 kV AC and 800 kV DC, with some station-post ranges extending to 1100 kV AC/DC.

Core material

load-bearing cylindrical insulating solid core made of resin-impregnated fibres.

Housing material

elastomer housing, typically silicone or ethylene-propylene.

End fittings

permanently attached metal end fittings.

Mechanical load classes

designed for cantilever, torsion, tension, and compression loads; station-post selection also uses specified bending load and tensile failing load.

Electrical selection criteria

impulse withstand voltage level and specific creepage distance are the main station-post electrical characteristics.

Construction length

one-piece designs are published up to 15 meters in length for large station-post applications.

Product Applications

Economy is more affordable

for indoor and outdoor switchyards, where the insulator must carry rigid live bus sections and maintain clear electrical separation from grounded steelwork.

Substation busbar supports
in air-insulated substations, where high stiffness and dependable creepage distance are needed around switching equipment.

Disconnector and isolator switch support posts
especially where mechanical loading, compact layout, and long service life matter in the same installation.

Reactor bay and switchgear platform support points
where composite station post insulators are used for high-voltage conversion equipment and demanding pollution conditions.

HVDC converter station insulation supports

Product Advantages

Compact strength in a lighter package

Composite station post insulators combine high electrical insulation with strong mechanical performance while remaining significantly lighter than traditional porcelain solutions.

Better performance in harsh environments

Manufacturers highlight pollution resistance, hydrophobic polymer housings, and optimized shed profiles for demanding substation locations.

Lower maintenance and easier system integration

One-piece designs, durable galvanized fittings, and reduced handling weight support faster installation and lower total cost of ownership in substation projects.

WellDone Composite Station Post Insulator Plan Drawin

FAQ

What is a Composite Station Post Insulator used for?

It is used to insulate and mechanically support busbars, disconnectors, reactors, and other substation equipment.
What standard applies to it?

IEC 62231 and IEC 62231-1 define composite station post insulators for substations with AC voltages greater than 1,000 V up to 245 kV.
Why choose a composite design?

It offers strong mechanical performance, lower weight, and better pollution resistance than many traditional insulator solutions.