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polymer insulator material

Mail insulating material for polymer insulator
In the past many years, a large variety of polymeric insulating materials have been developed, but only some have shown success in outdoor insulation. Now days, there are basically three classes that are in significant used:
1. Epoxy resins
2. Ethylene propylene rubbers
3. Silicone rubbers

polymer silicone rubber suspension insulator-Orient Power            polymer silicone rubber deadend insulator-Orient Power
polymer silicone rubber suspension insulator                           polymer silicone rubber deadend insulator   

Epoxy resins for polymer insulator
The epoxy resins have shown successful long term performance in clean environments, but under contaminated conditions their performance has been far from satisfactory. Therefore, epoxy resins use has been restricted to specific conditions. They are suitable for distribution class insulators up to about 69kV.

Ethylene propylene rubbers for polymer insulator
Three types of ethylene rubbers are in use for outdoor polymer insulator:
1: ethylene propylene monomer (EPM)
2: ethylene propylene diene monomer (EPDM)
3: co-polymer of ethylene propylene and silicone (ALLOY)
They are suitable for insulators up to 765kV. Their long term performance has been successful in clean environments.

Silicone rubber for polymer insulator
Silicone rubber has proven to be the most reliable polymer material for outdoor electrical insulation. It has three common types:
1. room temperature vulcanized(RTV)
2. high temperature vulcanized(HTV)
3. liquid silicone rubber(LSR)
Silicone rubber is able to maintain their hydrophobicity for longer periods of time. This is very important as it has the ability to suppress leakage current activity therefore preventing flashover and power system outages. Todays ,the trend is toward using silicone rubber for the housing of all types of overhead line polymer insulators.
 

 

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