Power quality (PQ) related issues are of most concern nowadays. The widespread use of electronic equipment, such as information technology equipment, power electronics such as adjustable speed drives (VSD), programmable logic controllers (PLC), energy-efficient lighting, led to a complete change of electric loads nature. These loads are simultaneously the major causes and the major victims of power quality problems. Due to their non-linearity, all these loads cause disturbances in the voltage waveform.¹
Electrical equipment is occasionally exposed to transient overvoltages (surges/spikes), swells, flickers, unregulated voltages, voltage dips/sags, interruptions or waveform disturbances (power factor, harmonics, others).