some thing - O DATA COLLECTION: fund=0 ime = someth LEDs 1.0mA Phase B Arms 122.2 % 69.8mA 63.3 378 20.5 18.2 anelli Phase A Arms 116.7 % 657A 53.4 and 36.3 22.0 18.0 17.7 14.2 9.5 t THD-i (%) 11 (rms) 13 (rms) 15 (rms) 17 (rms) 19 (rms) 111 (rms) 113 (rms) 115 (rms) Ih (rms) 1 (total rms) Phase C Neutral Arms Arms 115.3 % Over % 65.2 mA 54.5 3zef 38.2 7.0 22.7 14.7 13.1 15.0 11.5 4.0 500 6.0 92.0 17.5 13.2 10.0 V 9.0 Y Since the load is the same in all phases, you should expect to see similar magnitudes of current in each phase. If balanced, the 60Hz currents from each phase will cancel in the neutral. Any 60Hz current in the neutral represents unbalance current. Triplen harmonic currents from each phase add together in the neutral. 1 Total RMS Harmonic Current = Ihrms = 11; +1+1+1, +1,² +1,32 Total RMS Current = Irms = VI, + 13° +1° +1° +1, +1,1² +113? THD = Total Harmonic Distortion (-i = current; -v = voltage) % THD-I = RMS Harmonic Current (Ihrms, RMS Fundamental current (11) Vi+1; +1, +1, +1, +13 I 100% Power w/ 438 Page 3 DATA COLLECTION: LEDs Phase A Arms % Phase B Arms % Phase C Arms % Neutral Arms % THD-i (%) 11 (rms) 13 (rms) 15 (rms) 17 (rms) 19 (rms) 111 (rms) 113 (rms) 115 (rms) Ih (rms) 1 (total rms) Since the load is the same in all phases, you should expect to see similar magnitudes of current in each phase. If balanced, the 60Hz currents from each phase will cancel in the neutral. Any 60Hz current in the neutral represents unbalance current. Triplen harmonic currents from each phase add together in the neutral. Total RMS Harmonic Current = Inrms = 11, +1, +1, +1, +11° +113 2 Total RMS Current = Ims = 11,? +13+1° +1, +1, +1, +13 THD = Total Harmonic Distortion (-i = current; -v = voltage) % THD-I = RMS Harmonic Current (Ihrms) RMS Fundamental current (11) = I;' +l;' +1,' +T,' +1, +1, 1 -- 100% Page 38 REPORT REQUIREMENTS: 1) Show the waveforms, magnitudes and spectra (voltage and current) for each lamp. 2) What is the neutral current comprised of in terms of current at fundamental frequency vs harmonic frequencies? 3) Compare the neutral current to the triplen harmonic current for each individual lamp. Ist measured 3rd harmonic current in the neutral approximately equal to the sum of the 3rd harmonic current from all three lamps? Show this. 4) Compare the watts for each lamp to the VA for each lamp. 5) Compare the total PF and displacement PF for each lamp. 6) Calculate the distortion PF for each lamp. (PF Total = PF Displacement X PF Distortion 7) Draw the harmonics (current) triangle for each load. Label all three sides with actual numerical values and with percents (or p.u values). 8) Summarize your results including an explanation for these results. > Lab #8 Lab due date is 1-ph Non-Linear Loads PURPOSE: The purpose of this lab exercise is to gain an understanding of the effects of single phase non-linear loads on a 3-phase, 4-wire power system. Triplen harmonic currents from each phase sum together in the neutral conductor. EQUIPMENT REQUIREMENTS LED lamp (about 600-800 Lumens) Fluke 43B Harmonic Analyzer Four Current clamps CIRCUIT DIAGRAM: Circuit 1 - 3-phase, 4-wire Connect three LED lamps at 120V, 60Hz, 1 ph, 2w as shown. D D D View and capture (save) the waveforms and harmonic spectra for current and voltage for each phase and also for the neutral plus save all power related data (W, VA, PF, PFd). Move current clamp from phase to phase and to neutral to measure all of these.
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