ABSTRACT
The electrical power distribution networks for industrial systems normally rely on cable feeders to distribute the necessary power to the various industrial processes. Cables are similarly used to interconnect the various control and protection systems for both the electrical network and for the process. Control cables are required for most protection and control applications within an industrial system. Control cables are usually multicore, with conductors built up to meet the requirements of their functions, with four-core cables used for substation current transformer and voltage transformer connections, and larger arrangements for more complex ancillary interconnections. A very important parameter in cable selection is the insulation type. Common insulation types applicable to medium-voltage cables are: ethylene propylene rubber; cross-linked polyethylene; and tree-retardant cross-linked polyethylene. Cable insulation is designed to provide a long service life while balancing the cost of manufacturing with the risk of premature failure in service.
