Practices have proved using 50 Hz and 60 Hz frequencies are appropriate. If the frequency is too low, the electrical equipment's materials will increase, along with heavy and high cost, and will make lights flashing obviously. WHY USE 50 HERTZ? When the frequency increases, the copper and steel consumptions of the generator and transformer decrease, along with the reduction of weight and cost, but will make the inductances of the electrical equipment and transmission line increase, reduce the capacitances and increase losses, thereby reducing the transmission efficiency. The grid standard frequency is 50 Hz, which is a constant value. AC power frequency is determined by the pole number of the generator p and speed n, Hz = p* n/120. The speed of 50 Hertz 2 poles synchronous generator is 3000 rpm. The electricity 380V AC and 220V AC, are both 50 Hz frequencies. That means the voltage changes from positive to negative, and from negative to positive voltage, this process converts 50 times/second. the number of times per second (cycle/sec).ĥ0 Hertz (Hz) means the rotor of the generator turns 50 cycles per second, the current changes 50 times per second back and forth, direction changes 100 times. Hz (Hertz) is the frequency unit of the vibration cycle time of electric, magnetic, acoustic and mechanical vibration, i.e. In 1888, German physicist Heinrich Rudolf Hertz (Feb-22, 1857 to Jan-1, 1894), the first person confirmed the existence of radio waves, and had a great contribution in Electromagnetism, so the SI unit of frequency Hertz is named for him. Hertz, in short Hz, is the basic unit of frequency, to commemorate the discovery of electromagnetic waves by the German physicist Heinrich Rudolf Hertz. AC current direction changes 50 or 60 cycles per second, in accordance with 100 or 120 changes per second, then the frequency is 50 Hertz or 60 Hertz.Frequency is the times of the current changes per second, unit Hertz (Hz).

Cycle is the time of a cyclical change of the current.Alternating current (AC) is changing the direction of the current periodically.Some countries (regions) commonly use 50Hz power grid while other countries use 60Hz power grid.

50 Hz and 60 Hz power sources are most often used in international power systems.

Motor winding video in urdu