RwHigh capacity cables and conductors (bare and insulated) – 1920T2_PE4 5EEB.docx

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UNIVERSITY OF SANTO TOMAS FACULTY OF ENGINEERING España, Manila High Capacity Cables and Conductors (bare and insulated) INTRODUCTION Transmission Line is a vital part of power system which is composed of conductors and cables designed to carry large amount of electricity over long distances with minimum loses and distortion. The life and cost of a transmission line system depends on the material used in making the conductor. Due to high cost of copper, the most extensively used material in making transmission line conductor is aluminum. They have enough conductivity and it is also light weight which results to low conductor weight therefore less sag. However, aluminum conductors have low tensile strength, therefore, steel core is used to increase the tensile strength of aluminum conductors e.g. aluminum conductor steel reinforced, aluminum conductor alloy reinforced etc. Even though overhead lines are more economical, they are more susceptible to damage from wind-borne tree branches, high ice-loading conditions, and debris and from extreme weather compared to underground lines. Regarding its capacity requirement, underground transmission generally require large number of cables to match the capacity of the overhead circuit. OVERHEAD TRANSMISSION For 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 on the ff: 1. Required Electrical Properties 2. Required Mechanical Strength 3. Local Conditions 4. Cost of Material Even though ACSR type of conductor is the most widely used type of conductor, the need for a greater capacity conductor was realized in the late 1970s. With this, aluminum conductor steel supported (ACSS) were introduced which gave increased capacity compared to ACSR due to its ability to operate at high temperatures up to 250 degrees Celsius. While ACSS conductors are capable of operating at higher temperature under high electrical load conditions, ACCS conductors have reduced strength which requires more taller structures to be 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
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  • Fall '19
  • UNIVERSITY OF SANTO TOMAS, Electric power transmission

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