Question

In a three-phase rectifier, if the input currents are of rectangular waveforms, as show in Figure 1, with an amplitude of 10 A, calculate $I_s$ (rms), $I_{s1}$ (rms), $I_{distortion}$ (rms), %THD and PF. Assume that DPF = 1.0, as associated with the current waveforms in Figure 1. (Hint: use $i_a$ waveform which has sine symmetry, accordingly find $I_s$ (rms) using equation 5.5 in your text, then calculate $I_{s1}$ (rms) through Fourier analysis of 1<sup>st</sup> harmonic. See also example 5.1 in your text). Figure 1. In the above problem, please calculate the three-phase power through the rectifier bridge if $V_{LL}$ (rms) = 380 V.

          In a three-phase rectifier, if the input currents are of rectangular waveforms, as show in Figure 1,
with an amplitude of 10 A, calculate $I_s$ (rms), $I_{s1}$ (rms), $I_{distortion}$ (rms), %THD and PF. Assume that
DPF = 1.0, as associated with the current waveforms in Figure 1.
(Hint: use $i_a$ waveform which has sine symmetry, accordingly find $I_s$ (rms) using equation 5.5 in
your text, then calculate $I_{s1}$ (rms) through Fourier analysis of 1<sup>st</sup> harmonic. See also example 5.1
in your text).

Figure 1.

In the above problem, please calculate the three-phase power through the rectifier bridge if $V_{LL}$ (rms) = 380 V.

In a three-phase rectifier, if the input currents are of rectangular waveforms, as show in Figure 1,
with an amplitude of 10 A, calculate Is (rms), Is1 (rms), Idistortion (rms), %THD and PF. Assume that
DPF = 1.0, as associated with the current waveforms in Figure 1.
(Hint: use ia waveform which has sine symmetry, accordingly find Is (rms) using equation 5.5 in
your text, then calculate Is1 (rms) through Fourier analysis of 1<sup>st</sup> harmonic. See also example 5.1
in your text).

Figure 1.

In the above problem, please calculate the three-phase power through the rectifier bridge if VLL (rms) = 380 V.

Added by Miguel O.

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