POWER SYSTEM -- INTRODUCTION TO POWER SYSTEM
Generating Station/Power Station
1) Conventional Systems: It includes thermal systems, hydro-electric system, and nucleus system.
2) Non-Conventional System: It includes tidal energy, Biogas energy.
1) Primary Transmission: The bulk of electric power is transmitted from the generating station to the major load centers by overhead lines at 132, 220 or 400 kV. This forms primary transmission system.
2) Secondary Transmission: At the substation, power is received at 132,220 or 400kv and is stepped down to 66 or 33kv depending upon the amount of power to be fed to a particular area.
Primary Distribution: It is also known as high voltage distribution. This part of the system operates at voltages somewhat higher than that of general utility and handless large blocks of power.
Secondary Distribution: The electric power from primary distribution lines is delivered to various substations. It is known as Low Voltage Distribution.
The single phase residential load is connected between any one line and the neutral where as three phases 440 v motor load or furnaces etc. are connected across 3 phase lines directly.