World Of Electrical

Economic Choice Of Conductor in Transmission Line Design Economic Choice Of Conductor in Transmission Line Design Conductors used should have following electrical and physical properties: Chosen conductor must have high conductivity. In must have large tensile strength. It must have large corrosion resistance characteristics. It needs to have large melting point and good thermal stability. It has good ductile property. Following conductor material are most commonly use for transmission line : Hard drown copper Aluminium Aluminium conductors steel reinforced  (ACSR) In india, ACSR Conductors are more commonly used. From 1990 onwards, America, Australia and few european countries starts using All aluminium alloy conductor (AAAC). AAAC consists of aluminium, boron, silicates etc. As a main component material. Size of the conductor chosen depends on following factors : Length of the transmission line Voltage drop Load demand Voltage level Allowable temperature limit Current carrying capaci

Selection of voltage for high voltage transmission lines As power plants are located for away from the load centers so it is necessary transmit power at high voltages. Selection of voltage for high voltage Transmission Line Selection of voltage level depends on the following factors: Conductor size Future load growth Grid inter connection Cost of the transmission line Cost of equipment e.g. transformers insulators insulators, circuit breakers etc. Transmission line length Voltage regulation Power loss Intial and operating cost There is a exponential increase in the cost for voltage level above 220 kV and above. Voltages in India are: For short transmission line - 11kV, 22kV and 33 kV For medium transmission line - 66kV For long transmission line - 110kV, 220kV, and 440kV Future load growth depends on the possible development in that region. The choice of voltage level also depends on the conductor size. Conductor size affects the performance of transmission line in the form of transmis