What is composite insulator?
Composite insulator is also called polymeric insulator. It is developed after toughen glass insulator and ceramic insulators, whose main insulation structure is consist of a fiber glass core (rod) and silicon housing and sheds. One both side, 2 metallic fittings are installed on each side with crimping technics. These 2 metal fittings are for installation and connection on poles , insulators or conductors and cables. They are so well crimped by crimping machine that sufficient pressure makes it impossible to slip or loose between the metal fittings and fiber glass rod.
Where are composite insulator used?
Composite insulators covers a wide range of use in our daily life, on electrical power transmission, distribution and substations. Railway insulator is also one of main applications for composite insulators. To mean different demand and purpose of usage of composite insulators, the structure and fittings on both ends are designed into different length, space, diameter and shape.
What are common types of composite insulators?
The common types are:
Suspension composite insulator, mainly used in electrical transmission line, with long rod up to more than 3 meter or even 5 meters to isolate steel tower and conductors.
Tension composite insulator, also mainly used in electrical transmission line, with long rod up to more than 3 meter or even 5 meters to isolate steel tower and conductors. They are also seen in distribution lines with lower voltage like 11kv or 33kv, whose tensile function takes main effect. Some people like to call it dead-end insulator.
Composite post insulator, or post composite insulator, whatever it’s called, it’s designed for power substation. These post insulators have much larger diameter of fiber glass rod, because in substation project, besides its excellent insulation property, what we need form post insulator is their cantilever load in horizontal directions.
Pin composite insulators, widely used in power distribution line, with voltage of 33kv and 11kv, are used to support conductor and cables, as well as isolate the concrete poles or wooden poles from conductors. The fittings of pin insulator is different from what’s from a suspension insulator or tension insulator. One side of fittings on pin insulator is screw, as the pin insulator shall be installed with bolts and nut on cross-arm of poles (sometime directly fixed on wooden poles) ,the other side of fittings usually has a groove to hold the conductor.
What type of composite insulator does we produce?
Currently, we contune international corp has been supplying composite suspension insulators, composite tension insulators, composite pin insulators and composite post insulator from 11kv up to 33kv.
Insulators produced by us has been duly designed to meet electrical requirement under severe circumstances and their mechanical load have been strictly tested and inspected according to international electrical standard (IEC) to assure their performance and safety.
For suspension insulator and tension insulators, tensile tests are done on them to make sure no accident of slipping or loosing take place after the insulator is loaded with tons of force.
>>See more about “tensile test on insulators”
For polymeric pin insulator and post insulator, cantilever test (bending test) is applied so that bending load can reach and exceed its specific mechanical load. Torsion test is also done on post insulator as this is also one of its most significant function in substation environment.
>>See more about “bending and torsion test on insulators”