Schaffner Group
User and Installation Manual
Ecosine FS42842
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IEEE Std 519-1992 also introduces the total demand distortion (TDD), the harmonic current distortion in
% of maximum demand load current (15 or 30min demand).
The limits listed in Tables 10-3 (respectively, Table 2 pag7 in the last release IEEE-519/2014, the table is
unchanged) should be used as system design values for the worst case for normal operation (conditions
lasting longer than one hour). For shorter periods, during start-ups or unusual conditions, the limits may be
exceeded by 50%.
Table 10-3: current distortion limits for general distribution systems (120V through 69000V):
23.8 Other standards:
ecosine
®
harmonic filters are suitable to help fulfill the most stringent requirements of IEEE Std 519- 1992
or EN 61000-3-12. They also fulfill the requirements of other standards, like e.g. EN 12015 for elevators
and escalators. However, because of different/relaxed limits, simpler filters may be sufficient for the job.
Schaffner has already designed many engineered harmonic filters for relaxed requirements and may be
able to quickly offer you a custom product that perfectly matches the requirements of an application.
