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ac transmission layout

                        AC TRANSMISSION LAYOUT
                           PRIMARY TRANSMISSION:
                                          
   In generating station electric power is produced by 3 phase alternators operating in parallel. The usual generation voltage is 11kv. It may be 6.6kv (or) 33kv in certain cases. For economy in the transmission of electric power, the generation voltage(11kv) is stepped upto 132KV or 230KV at the generating station with the help of 3 phase transformer. The electric power at 132 KV is transmitted by 3 phase 3 wire overhead system. This forms the primary transmission. 

                       SECONDARY TRANSMISSION :
                                                 
   The primary transmission terminates at the receiving station(RS). At the receiving station, the voltage is reduced to 33KV by step-down transformer. From this station electric power is transmitted at 33KV by 3 phase 3 wire overhead system to various sub stations(SS). This forms the Secondary transmission. 

                            PRIMARY DISTRIBUTION :
                                               
 The secondary transmission line terminates at the sub-station(SS), where the voltage is reduced from 33KV to 11KV. From the station, electric power is transmitted to bulk consumers and Distribution Station. This forms the primary distribution. 

                        SECONDARY DISTRIBUTION :
                                               
    The electric power from distribution line is delivered to distribution sub station (D.S). The distribution substation receives power at 11KV and steps down the voltage to 400V, 3 phase - 4 wire for secondary distribution. The voltage between any two phases is 400V and between any phase and neutral is 230V. Secondary distribution system comprises of feeders, distributors and service mains Feeders radiating from the distribution substation supply nower to the distributors. No consumer is given direct connection from the feeders. The consumers are connected to the distributors through the service mains.
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