Polymer Insulators or Porcelain Insulators? What to you, when, where, and how? Which is better? Are composite insulators really better than ceramic insulators?  This is one of the debates in the field on transmission lines construction. There have been differing in opinion on the general idea, but is there really basis for comparison? Is one really better than the other, or is it just a matter of using the best choice at a given situation or condition.

Polymer or porcelain? To answer this, we came up with a compilation and collection of selected essays, technical papers, and resources on this subject matter. We hope you will find this useful.

Comparison between Composite Insulators and Ceramic Insulators.

Comparison of AC Artificial Pollution Flashover Performance Between Porcelain and Glass Insulators
The flashover voltage,voltage gradient and the valid creepage distance of polluted insulators are related to its materials and configuration. Read more...

Ceramic vs. Polymer (Non-Ceramic) Insulators by Rural Utility Services (RUS USGOV)
Ceramics                                             Polymers
Made from Inorganic                           Made from Organic Materials
Do not age                                           Age
>80 years of experience                       > 30 years experience
Flexibility in Length                             Lighter Latest designs < 10 years
High Leakage Distance
Profiles                                              Less susceptible to vandalism Smaller Viewing Profile
Can be coated & washed                   Good short term performance in polluted environment

Six Utilities Share Their Perspectives on Insulators
Trends in the changing landscape of high-voltage insulators are revealed through utility interviews.
The high-voltage transmission system in North America is the result of planning and execution initiated soon after World War II. Ambitious goals, sound engineering and the vertically integrated structure of utilities at that time all contributed to high reliability and good quality of electric power. The high-voltage transmission infrastructure development peaked in the 1970s.
From then on until the turn of the century, load growth was not as high as anticipated, resulting in a drastic reduction in transmission activity. Read more... 

Insulator Types – Comparisons
This is a .pdf file comparing the insulator Types.
Read more...  

Polymer vs Porcelain Suspension Insulator Equivalence - What To Use?
The superiority of polymer insulators over porcelain insulators leads to several differences in characteristics and application criteria for these two insulation systems. Examined in this article are the various criteria used in selecting insulators and the development of a suitable method for selecting the correct size polymer insulator. Read more...

The Best Insulator for your Substation
By definition, an insulator is a material that resists the flow of electric current. An insulating material has atoms with tightly bonded valence electrons. These materials are used in parts of electrical equipment, also called insulators, intended to support or separate electrical conductors without passing current through themselves. The term is also used more specifically to refer to insulating supports that attach electric power transmission wires to utility poles. Read more...

The Advantages of Polymer Insulators over Porcelain InsulatorsA tabulated comparison between polymeric and porcelain insulators made by Spark Insulators.

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