Re: Harmonics current mitigation of electrical system

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#12485
Anonymous
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we just finished the mall project & in this peak summer we checked harmonic study & found 04 nos of panel are showing total demand distortion limit is as per below detail
R % TDD = THDI x (I1/IL) =22% x (830/1565.7)=11.7%
Y % TDD = THDIx (I1/IL) =22% x(814/1565.7) =11.4 %
B% TDD = THDI x(I1/IL ) =21%x (853/1565.7 )=11.4%
%total demand distortion (%TDD)
LV MDB Isc /IL 41.5 TDD R11.7% Y 11.4% B 11.4% as per IEEE 519 1992 standards 8% is acceptable limit we need metegation plan how we can close this issue by doing less modifaction in the system & expence wise total 4 nos of MDB,s are same value , the active load in this panels is VFD,s lighting ,motors ,chillers with inbuilt VFD , fan coil units ,air handling units