1. General

The history of insulated power cables is now more than one hundred years old. Three main technological trends have developed since the beginning:

• impregnated paper-insulated cables ;

• cables with extruded synthetic insulation ;

• gas-insulated cables.

Future prospects for cryogenics [47] were also assessed in the laboratory.

• Since the beginning of the twentieth century, insulation with oil-resin-impregnated or simply oil-impregnated paper has dominated the...