UNIVERSITY OF SANTO TOMASFACULTY OF ENGINEERINGEspaña, ManilaHigh Capacity Cables and Conductors (bare and insulated)INTRODUCTIONTransmission Line is a vital part of power system which is composed of conductors andcables designed to carry large amount of electricity over long distances with minimum losesand distortion. The life and cost of a transmission line system depends on the material used inmaking the conductor. Due to high cost of copper, the most extensively used material inmaking transmission line conductor is aluminum. They have enough conductivity and it is alsolight weight which results to low conductor weight therefore less sag. However, aluminumconductors have low tensile strength, therefore, steel core is used to increase the tensilestrength of aluminum conductors e.g. aluminum conductor steel reinforced, aluminumconductor alloy reinforced etc.Even though overhead lines are more economical, they are more susceptible todamage from wind-borne tree branches, high ice-loading conditions, and debris and fromextreme weather compared to underground lines. Regarding its capacity requirement,underground transmission generally require large number of cables to match the capacity ofthe overhead circuit.OVERHEAD TRANSMISSIONFor high-voltage transmission lines, the aluminum conductor steel reinforced (ACSR)type of conductor is the most popular. The choice of material in transmission lines depends onthe ff:1.Required Electrical Properties2.Required Mechanical Strength3.Local Conditions4.Cost of MaterialEven though ACSR type of conductor is the most widely used type of conductor, theneed for a greater capacity conductor was realized in the late 1970s. With this, aluminumconductor steel supported (ACSS) were introduced which gave increased capacity compared toACSR due to its ability to operate at high temperatures up to 250 degrees Celsius. While ACSSconductors are capable of operating at higher temperature under high electrical loadconditions, ACCS conductors have reduced strength which requires more taller structures tobe utilized. The list below also shows other type of overhead line conductors used:1.AAAC (All Aluminum Alloy Conductors)2.AAC (All-Aluminum Conductors)3.AAACSR (Aluminum Alloy Conductor Steel Reinforced)4.ACAR (Aluminum Conductor Alloy Reinforced)5.ACSR (Aluminum Conductor Steel Reinforced)88225f838a469a906fd01f6d048e7c5e98a5fd18.docx | DELL
You've reached the end of your free preview.
Want to read all 7 pages?
UNIVERSITY OF SANTO TOMAS, Electric power transmission