Factors Porcelain Insulator Composite Insulator Mechanical Stress Depends on  Depends on -Design  -Crimping -Material -Crimping Length -Hardware FRP  Rod Presence of Cracks  No Possibility of Cracks Electrical Stress Puncturable  Non Puncturable    Restricted Creepage distance No restrictions   Effected by Power Arc Not effected by Power Arc Pollution Performance No Hydrophobicity, Performance poor in Harsh Environment Excellent Hydrophobocity and best performance in Harsh environments. Maintenance Must  Maintenance free Weight More Less ( appx 1/4th)  Packing: Low High COST SAVING FACTORS Factors Porcelain Composite Transportation Breakage Possiblity (cost Involved) No Breakage (No additional cost involved) Cost of Transport More Less Man Power To make strings in the field, People are required e-Involves additional cost No such Requirement because of single peace   Lifting to tower required more people – Involves additional cost Nominal Man power required because of less weight Maintenance Requires Frequently for cleaning, Greasing etc Maintenance FREE Puncture of unit Possible during service – Tracing and replacement involves Cost & Time Puncture proof Vandalism  Prone – Replacement involves Cost Unbreakable Energy Loss More Less Loss – Saves Power Additional Qty  Required to cover breakages Not required. Polluted Envronments Performance not satisfactory Performance Excellent WEIGHT        11kV 5.0 KGS. 1.1 KGS. MECHANICAL STRENGTH LOW HIGH