Overview of the guide for applying harmonic limits on power systems-IEEE P519A

IEEE 519-1992 provides the basis for applying harmonic limits on both the power system and for injection of harmonics from individual customers. This standard, along with IEC 1000-3-6, has been used as the basis for other harmonic standards being implemented around the world. As the standard has been applied, many applications concerns have been identified: (i) where to select the point of common coupling; (ii) how to select the base current for evaluating harmonics from individual customers; (iii) evaluating the direction of harmonic flow when a customer has power factor correction capacitors and/or harmonic filters; (iv) how to evaluate harmonics that occur only for short durations or infrequently (statistical nature of harmonic levels); and (v) how to evaluate compliance through measurements. A new task force was developed in IEEE to address these concerns. A draft of a new application guide-Guide for Applying Harmonic Limits on Power Systems, has been completed by Task Force P519A. This paper describes some of these important application concerns associated with applying and evaluating harmonic limits. Recommended methods for addressing these concerns are summarized and illustrated with an industrial customer example.