WHAT INFORMATION IS REQUIRED FOR DESIGN OF FILTERS?
The concept of tuned filter is to create a lower impedance path, as compared to that of the source, for currents at frequencies other than 50 Hz. The information required for the filter manufacturing is source impedance, pf information, network voltage, load power information and harmonic summaries at each load. Normally the object of installing the harmonic filter shall be one of the following : • Power Factor Correction to avoid utility demand charges • Release of Capacity to unload system transformers and cables • Compliance with local or international standards like IEEE-519-1992, IEC-61000-2-3. • Operational Problem in plant. System impedance is important because it will determine how big, how many stages, and how aggressive the filter or filters must be tuned. If the source is stiff (a small impedance) than the filters need to be more aggressively tuned and may require to be tuned at multiple frequencies(stages) to meet the filteration target. If the system is weak (a large imped
