Harmonic detection and filtering - Schneider Electric

The main effects of harmonicsin installations4.3.5 CapacitorsAccording to standards, the rms current flowing in capacitors must not exceed 1.3times the rated current.b example (already presented above):consider a supply voltage with the following levels of individual harmonic distortion(u h) where U 1 is the fundamental voltage:-u 5 : 8 % of U 1-u 7 : 5 % of U 1-u 11 : 3 % of U 1-u 13 : 1 % of U 1(i.e. a voltage THD of 10 %).as a resultIIrms1= 119 ,, at the rated voltage.At a voltage level equal to 1.1 times the rated voltage,II1current level is overrun and the capacitors must be resized.rms= 13 ,the maximum4.3.6 Neutral conductorsConsider a system made up of a balanced three-phase source and three identicalsingle-phase loads connected phase-to-neutral.E95235Figure 10 - Flow of currents in the various conductors connected to a three-phase source.24