With the advent of modern electronics, most of the industrial loads became nonlinear (E.g., Variable frequency drives, rectifier loads and UPS) in electrical systems. These loads are main sources of generating harmonics in the system. The presence of Harmonics in an industry will often result in malfunctioning of the electrical system. Harmonics is one of the major power quality issues in many processing industries like Cement industry, Marble industry, Steel plants, Rolling mills, Printing

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... s, Quarries, Battery manufacturing industry etc.,. Lower order harmonics cause major problems in most of these industries. In the case of a battery manufacturing industry, Charge & Discharge cycles are required for battery testing. For this process rectifiers are used which are nonlinear loads and induce harmonics into the system. For harmonic reduction, there is a need to identify, measure the type & level of harmonics in a system. Thus detailed power quality analysis must be done. And then a solution has to be provided for reducing harmonic levels in the system. Amara Raja is one of the such valve regulated lead acid battery manufacturing industries. Hence, Harmonic study is done in that industry and measurement of the level of harmonics is done through 3ph power analyzer. After measurement, it was found that 5 th order & 7 th order harmonics were beyond the IEEE limits. Then detuned filter was designed. After installation of harmonic filter, harmonic measurement was done again and it is found that the 5 th & 7 th order harmonic contents were below the IEEE limits.