The Harmonic Detector is an instrument that monitors the harmonic energy in a power system. The function is the receiving/transmitting control function and the communication mode selection function. When the voltage or current waveform in the grid is not ideally sinusoidal, indicating that it contains a voltage or current component with a frequency higher than 50 Hz, we call the current or voltage component with a frequency higher than 50 Hz as a harmonic. When the harmonic frequency is an integer multiple of the power frequency, we call it an integer harmonic, which is usually expressed in number of times. For example, a harmonic whose frequency is 5 times (250 Hz) of the power frequency is called a 5th harmonic, and a harmonic whose frequency is 7 times (350 Hz) of the power frequency is called a 7th harmonic, and so on. Most harmonics generated by nonlinear loads are integer harmonics. When the harmonic frequency is not an integer multiple of the power frequency, we call it a fractional harmonic. Such harmonics are usually expressed directly using harmonic frequencies. Harmonic Current and Voltage Tester Harmonic Current and Voltage Tester is a HWT301, clamp CT tester.
