If power quality is poor, then it becomes the major issue due to mal-operation of the equipments, increase in loss and heat, over burdening of the power system. This is due to the widespread use of sensitive microprocessor-based controls and power electronics devices for higher efficiency, pf improvements, and adjustable speed drives etc. The proliferation of large computer systems into many businesses and commercial facilities. The development of power electronics equipment for improving system stability, operation, and efficiency (these devices are a major source of bad power quality and are themselves vulnerable to such quality of power) Huge economic losses will take place if equipment fails or malfunctions.