EDUCATION

                                          BUS BAR             Bus bar is a group of conductor, which is used to carry the current from one place to another place. in bus bar, material like bronze, aluminium, copper are used as a bus bar. aluminium is good to use, because it is cheap, less in weight. The bus bar's are manufacture in the shape of rectangle, square, and round tubes. The most common of the bus-bars are 40x4mm (160 mm); 40x5 mm (200 mm2); 50x6 mm (300mm2); 60x8 mm (480 mm2) ; 80x8 (640 mm2) and 100x10 mm (1000 mm). WHY BUS BAR'S ARE USED IN ELECTRICAL SYSTEM:              In some case using of bus bar's are most useful then the using of cables EXAMPLE:  in a power plant or power distribution center, sometimes they handles high amount of power, for that cables aren't convenient. they might need a cable as thick as a firehose and six times as heavy to carry the current. If not cable can melt, In those cases, instead

                                    ELCB AND RCCB ELCB : ( EARTH LEAKAGE CIRCUIT BREAKER )          The ELCB, which normally operates based on voltage, is a simple ELCB.  The way the Voltage ELCB works is simple.  A terminal of the Relay coil is attached to the metal body of the equipment to be protected.  Next to Relay Coil. If any insulation fails, or the phase wire in the electric supply touches the metal body of the equipment, a voltage difference occurs between the relay coil connected to the equipment and the earth.  When this voltage difference exceeds a certain limit, the relay coil becomes larger and the relay becomes operable.  So the circuit breaker attached to the relay operates and disconnects the supply to the equipment. RCCB : ( RESIDUAL CURRENT CIRCUIT BREAKER)          Residual current circuit breaker is more sensitive than ELCB.  The ELCB, based on the current, is called the RCCB.  it contain 2 primary windings and 1 secondary windi

                        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).