uses of SL type, HSL type, oil filled cables
Answers
Explanation:
S.L Type Cables: It is similar to the H type cables, with the difference that each of the three cores has its own lead sheath. With this provision, the need for the overall sheath used previously is eliminated. The advantage of such a construction is that the chances of a core-to-core breakdown are greatly minimized.
H.S.L. Type Cables: This type of cable is combination of H type and S.L. type cable. In these cables each core is insulated with impregnated paper and provided with seperate lead sheaths.
Oil Filled Cables: Oil is circulated under suitable pressure through ducts provided for such purpose. This oil supply and pressure are maintained through reservoirs kept at proper distances. The oil used is the same that is employed for impregnation of paper insulators.