※What is Harmonics? = Harmonics are defined as sine waves with a frequency that is an integer multiple of the fundamental wave. Harmonics have the property of adversely effecting an electric furnace, connection equipment, and a transformer by the electric current. The frequency of three times the fundamental wave is called the third harmonic, the frequency of five times the fundamental wave is called the fifth harmonics. Each electric power company is focusing on the suppression of these low-order harmonics in particular.
Ex. The third harmonic of 50 Hz is a sine wave having a frequency of 50 times 3 = 150 Hz