Power systems and harmonic factors

Harmonic currents and distortions in power systems are a natural progression in society's use of electrical equipment. A proliferation of harmonics can cause problems-some severe. However, the benefits we receive from electrification far outweighs the downside to this problem. There is an increased awareness among equipment designers, manufacturers, and users for the need to reduce power system harmonics. However, much work still needs to be done. This paper describes how harmonics arise from nonlinear loads and their effects on the power system. The problems that arise from harmonic current flow are straightforward and simple. The two main problems are abnormal heating of components and disruption of operation. The paper also describe mitigation of harmonic effects which take on two strategies: one is to reduce the harmonic effect; the other is to reduce or control the harmonic content.