Harmonic detection and filtering - Schneider Electric

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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
The graphs in figure 11 below show an example of the currents flowing in the threephases and the resulting current in the neutral conductor.E55536E55535Figure 11 - Example of currents flowing in the various conductors connected to a three-phaseload, where I n = i r + i s + i t.In this example, the rms value of the current in the neutral conductor is 3 timesgreater than that of the current in a phase. The neutral conductor must therefore beresized accordingly.25
Page 1: Low voltage expert guidesHarmonic d
Page 7 and 8: GeneralEn bref1.1 Definition of har
Page 9 and 10: En brefHarmonic currents are caused
Page 11 and 12: 1.2 Why harmonics need to be detect
Page 13 and 14: 2.3 Power and harmonics2.3.1 Active
Page 15 and 16: En bref2.5 Total harmonic distorsio
Page 17 and 18: En brefThe primary indicator is the
Page 19 and 20: 3.2 Procedure for harmonic analysis
Page 21 and 22: The main effects of harmonicsin ins
Page 23 and 24: 4.2.2 Losses in asynchronous machin
Page 25: standard UTE C15-112 indicates a de
Page 29 and 30: 4.5.4 Reduction in the service life
Page 31 and 32: 5.4 Maximum permissible harmonic va
Page 33 and 34: 6.1.3 Separating the sourcesIn effo
Page 35 and 36: En brefIn cases where the preventiv
Page 37 and 38: 6.2.4 Selection criteriab passive f
Page 39 and 40: E95389DB1051547.1.3 Using power-met
Page 41 and 42: Circuit MonitorMicrologic control u
Page 43 and 44: Circuit MonitorMicrologic control u
Page 45 and 46: ION7650 ION7550 ION7350 ION7330 ION
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Page 50 and 51: Harmonic-management solutionsfrom S
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Harmonic detection and filtering - Schneider Electric

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