What are harmonics?
Non linear loads, such as: rectifiers, inverters, speed variators, furnaces, etc. that absorb periodic non-sine wave currents from the network. Said currents are composed of a fundamental frequency component rated at 50 or 60 Hz, plus a series of overlapping currents, with frequencies that are multiples of the fundamental frequency. This is how we define ELECTRICAL HARMONICS, which generate major technical and economic costs.
The result is a deformation of the current (and consequently, voltage) leading to series of associated secondary effects.
Effects of harmonics
The main effects of the voltage and current harmonics in a power system can be cited as:
- The possibility of amplification of some harmonics as a result of serial and parallel resonance
- Reduction in the performance of energy generation, transmision, and usage systems
- The ageing of the grid isolation components and as a consequence, energy reduction