Electrical power  is expected to  deliver undistorted sinusoidal rated  voltage and  current  continuously at  rated frequency to the  consumers. Power  quality can  be  defined as any  problem manifested in voltage, current, or frequency deviation that  results in failure or malfunction of electric equipment. Power  quality is predominantly a customer issue. When quality of the power supplied is deficient, it results in performance degradation and reduced life expectancy of equipment. To prevent them intensive care is required to be taken in all aspects of electrical network. Improved Power Quality will reduce yearly maintenance cost.