A post insulator’s design usually has ribbed or corrugated sheds. This design isn’t random. It makes the creepage distance much longer. Creepage distance is the path along the surface between the metal end parts. A longer creepage distance stops flashover. It does this by blocking the formation of a continuous conductive path. This is really important in places with high humidity, rain or industrial pollution. The metal end parts—they’re often galvanized steel or aluminum—are firmly glued to the porcelain body. They give a strong connection point for putting the insulator together and linking it to other parts.
You can find these insulators almost everywhere in electrical substations and power generating stations. They’re used in switchgear. They work as bus supports too. And they’re used in different kinds of equipment. They have big advantages over some other materials, like polymers. They’re better at resisting tracking and erosion. They stay stable when under mechanical load. And they last a long time without needing much maintenance.
To sum up, abimat porcelain post insulators are still a basic and reliable choice for power transmission and distribution. They balance two things well: great electrical insulation and the mechanical strength needed. That strength makes sure the power system works safely and continuously. 
