Question: What are the various kind of cables used for transmission?

John Ging answered on 13 Nov 2014:

Yes, lots. There are several different types for different voltages.
Most of them are made from either copper or aluminium. They are then wrapped with either plastic or other metals, even paper (well special paper). Many of them are filled with oil to provide electrical insulation or cooling functions. The main types are XLPE or cross linked polythene. They can be laid in different formations (either side my side or all in a cluster like a triangle) and can have difference thicknesses. See http://www.google.ie/imgres?imgurl=http%3A%2F%2Fwww.nsw.com%2FPortals%2F0%2FDokumente%2FBilder%2FKopie%252520von%252520NSW%252520HV%252520and%252520MV%252520Cables.jpg&imgrefurl=http%3A%2F%2Fwww.nsw.com%2Fen-us%2Fproductsbrservices%2Fcable%2Fpowercables%2Fsubmarinepowercables.aspx&h=746&w=1024&tbnid=7skoWUeF-Gd4cM%3A&zoom=1&docid=xjapmceRSdDg7M&ei=DsRkVOiMLavG7Aac94HYAw&tbm=isch&ved=0CFQQMygqMCo&iact=rc&uact=3&dur=1039&page=2&start=37&ndsp=44 for pics