A composite post insulator is an insulating support component used in substation facilities within power systems; it is a specific type of composite insulator. Its primary function is to support conductors and equipment while simultaneously ensuring electrical insulation.
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READ MOREA composite post insulator is an insulating support component used in substation facilities within power systems, built to support conductors and equipment while ensuring electrical insulation at the same time. Taizhou HuaDong Insulated Material Co., Ltd manufactures composite post insulators as one specific type within its broader composite insulator product range, engineered for busbar supports, switchgear equipment, and power distribution installations inside substations.
A composite post insulator consists of three main parts, and Taizhou HuaDong Insulated Material Co., Ltd builds each one to a specific function within the finished support column.
Core Rod
Typically made from glass fiber reinforced epoxy resin, the core rod serves as the internal load-bearing structure, providing high-strength mechanical support.
Sheds
The exterior is covered with silicone rubber material arranged in a multi-layered umbrella-like structure. The hydrophobic surface effectively prevents pollution flashover.
End Fittings
Metal flanges or threaded connectors at the top and bottom secure the insulator to equipment or support towers.
Every composite post insulator produced by Taizhou HuaDong Insulated Material Co., Ltd is built around six measurable performance traits that set it apart from traditional porcelain post insulators.
Excellent Hydrophobicity
The silicone rubber shed surface automatically repels moisture, maintaining insulation performance in humid or polluted environments and effectively preventing pollution flashover.
Strong Aging Resistance
Materials are resistant to ultraviolet radiation and aging, ensuring a long service life in outdoor substation conditions.
Resistance to Tracking and Corrosion
The insulator withstands the adverse effects of harsh environments such as acid rain, salt fog, and industrial pollution.
Superior Mechanical Properties
High resistance to bending, compression, and impact, with vibration resistance and resistance to brittle fracture superior to traditional porcelain insulators.
Lightweight
Significantly lighter than porcelain insulators, which makes transportation and installation easier while reducing the structural load on support towers.
Convenient Installation
Mounting dimensions at the top and bottom match traditional porcelain post insulators, allowing direct interchangeability without modifying existing equipment foundations.
Composite post insulators are primarily used in substation facilities. Founded in October 1994 as Yangzhou Dajieshi FRP Products Co., Ltd and now based in Jiangyan district, Taizhou city, Jiangsu province, Taizhou HuaDong Insulated Material Co., Ltd supplies composite post insulators together with its other composite insulator, FRP rod, and metal end fitting product lines to customers across North and South America, Africa, Asia, and Europe, including the USA, Kenya, Korea, India, Vietnam, Iran, Russia, Germany, and Romania.
Insulating supports for substation busbars
Insulating supports for switchgear equipment
Insulating isolation for power distribution equipment
Model selection depends on rated voltage, mechanical load, and mounting geometry. The specifications below cover the composite post insulator models Taizhou HuaDong Insulated Material Co., Ltd manufactures, from 10kV up to 220kV.
What is a composite post insulator used for
It is used as an insulating support component in substation facilities, supporting conductors and equipment such as busbars, switchgear, and power distribution equipment while ensuring electrical insulation.
What is the difference between a composite post insulator and a composite pin insulator
A composite post insulator is used as a support column for substation busbars, switchgear, and distribution equipment, while a composite pin insulator is designed for mounting on transmission line crossarms.
Can a composite post insulator replace a porcelain post insulator directly
Yes, the mounting dimensions at the top and bottom match traditional porcelain post insulators, allowing direct interchangeability without modifying existing equipment foundations.
What voltage levels are available for composite post insulators
Models are available from 10kV up to 220kV, with mechanical bending loads ranging from 4kN to 10kN depending on the type.
Are composite post insulators resistant to acid rain and salt fog
Yes, they are built to withstand the adverse effects of harsh environments including acid rain, salt fog, and industrial pollution without losing tracking and corrosion resistance.
What mounting hole specifications do composite post insulators use
Across the FZSW series, the mounting hole center distance is 127mm with an 18mm hole diameter, keeping hardware consistent across the 10kV to 220kV range.
Is a composite post insulator heavier or lighter than a porcelain post insulator
It is significantly lighter than a porcelain post insulator, which makes transportation and installation easier while reducing the structural load placed on support towers.
What creepage distance do composite post insulators provide
Creepage distance varies by voltage class, ranging from 540mm on the 10kV FZSW-10/4 model up to 6300mm on the 220kV FZSW-220/8 model.
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