EE 330/330L Energy Systems (Spring 2012) Laboratory 1 Three-Phase Loads
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1 ee330_spring2012_l_01_3phse_lods.do 1/5 EE 330/330L Energy Systems (Spring 2012) Lortory 1 ThreePhse Lods Introdution/Bkground In this lortory, you will mesure nd study the voltges, urrents, impednes, phse ngles, power ftors, nd rel & retive power in lned threephse systems. In prtiulr, lned YY (Fig. 1) nd (Fig. 1) threephse systems will e studied. lso, n unlned YY system is exmined. I V n V n n I n Y n V n I I Y Y ) I I V V V V V I I ) Figure 1 Blned ) YY (4wire) nd ) threephse systems. Preliminry 1) For the lned YY threephse iruit shown in Fig. 1, the phse voltges V n, V n, & V n re 63.5 V rms. For lod impedne Y 100, determine the line/phse urrents I L = I = I = I, neutrl urrent I n, linetoline voltges V LL = V = V = V, phse pprent powers S = S = S, totl pprent power S, phse powers P = P = P, totl power P, phse retive powers Q = Q = Q, totl retive power Q, phse power ftors pf = pf = pf, nd overll power ftor pf. 2) ssuming frequeny of 60 Hz, repet prt 1 when indutors with wire resistne of 15 nd indutne of H re pled in series with the lods of prt 1. Wht is the new lod impedne? Tulte nswers from prts 1 & 2 (e.g., olumn 1 quntity nme, olumn 2 prt 1 nswer, nd Y olumn 3 prt 2 nswer). 3) For the lned threephse iruit shown in Fig. 1, the linetoline/phse voltges V, V, & V re 90 V rms. The lod impedne is 100 in series with indutors with wire resistne of 15 nd indutne of H. ssuming frequeny of 60 Hz, determine the phse urrents I = I V I
2 ee330_spring2012_l_01_3phse_lods.do 2/5 I = I = I, line urrents I L = I = I = I, phse pprent powers S = S = S, totl pprent power S, phse powers P = P = P, totl power P, phse retive powers Q = Q = Q, totl retive power Q, phse power ftors pf = pf = pf, nd overll power ftor pf. Tulte nswers. 4) Red through the following experiments nd determine whih equtions will e needed for the lultions. Experiment 1 1) Connet lned YY threephse iruit with lod impednes of Y 100 (use rheostts). lok digrm of the neessry onnetions, inluding wttmeters nd mmeter, is shown in Fig. 2. Do NOT plug in the power ord t this point. Using n ohmmeter (multimeter), mesure nd reord the d resistnes R, R, nd R of the lods. Threephse Wll Outlet Plug Power Cord Green ground ( n) wttmeter (phse ) white/red/lk Breker Box wttmeter (phse ) white/red/lk Vri White phse white/red/lk Red phse wttmeter (phse ) Blk (phse ) ~ 10 ERO ~ 10 ERO ~ 10 ERO ~ 200 V ~ 200 V ~ 200 V ~ 600 V ~ 600 V ~ 600 V I 2000 W I 2000 W I 2000 W II 6000W II 6000W II 6000W LOD LOD LOD 10 COM V 10 COM V 10 COM V Y, Y, Y, Figure 2 Blned YY threephse iruit for Experiment 1. 2) fter ensuring the reker ox is off nd tht the vri is set to 0 (ll the wy CCW), plug in the power ord. Designte the white wire s phse, red wire s phse, nd lk wire s phse (totlly ritrry). Use voltmeter (multimeter) to mesure the wll outlet linetoline voltges V, V, & V nd phse voltges V n, V n, & V n t the reker ox input jks. Use the frequeny mesurement pility of the multimeter to verify tht the frequeny is ~60 Hz.
3 ee330_spring2012_l_01_3phse_lods.do 3/5 3) Turn on nd zero the wttmeters in I mode. Then, put the wttmeters in 200 V mode to mesure the phse voltges. Turn on nd ensure the mmeter (multimeter) is properly onneted nd set for urrent. Turn the reker ox on nd slowly inrese the vri setting until phse voltges of ~63.5 V rms re hieved. 4) Mesure nd reord the tul phse voltges V n, V n, nd V n. Put the wttmeters in 10 mode. Mesure nd reord the phse urrents I, I, nd I. Put the wttmeters in 2000 W mode. Mesure nd reord the phse powers P, P, nd P. 5) Using the mmeter, mesure nd reord the neutrl urrent I n. 6) Using voltmeter (multimeter), mesure nd reord the linetoline voltges V, V, nd V. 7) Set the vri to 0 (i.e., rotte dil/kno ll the wy CCW), turn reker ox off, nd unplug the power ord. Do NOT disssemle iruit. 8) Using the preeding mesurements, determine the totl power P, pprent powers S, S, & S, totl pprent power S, power ftors pf, pf, & pf, overll power ftor pf, impedne phse ngles,, &, lod impedne mgnitudes,, &, omplex impednes,, & (put in retngulr form), retive phse powers Q, Q, & Q, nd totl retive power Q. 9) Tulte nominl vlues nd lulted nswers from prt 1 of the preliminry nd experiment 1 (e.g., olumn 1 quntity nme, olumn 2 prt 1 nswer, olumn 3 experiment 1 nswer, & olumn 4 % differene, exept for omplex numers). List in order mesured/lulted in experiment 1. How do the lulted nd mesured quntities ompre? Disuss disrepnies. Experiment 2 1) Otin three indutors from the instrutor or tehing ssistnt (T). Reord the leled indutne vlues of L, L, nd L. 2) Modify the iruit of Experiment 1 y inserting the indutors in series with the ~100 lod impednes (rheostts). Then, mesure nd reord the DC resistnes of the indutors in series with the 100 lods, i.e., R R w,, R R w,, nd R R w,. 3) fter ensuring the reker ox is off nd tht the vri is set to 0, plug in the power ord. If neessry, turn on nd zero the wttmeters in I mode. Then, put the wttmeters in 200 V mode to mesure the phse voltges. Turn on nd ensure the mmeter is properly onneted nd set for urrent. Turn the reker ox on nd slowly inrese the vri setting until phse voltges of ~63.5 V rms re hieved. 4) Mesure nd reord V n, V n, V n, I, I, I, P, P, P, I n, V, V, nd V. 5) Set the vri to 0 (i.e., rotte dil/kno ll the wy CCW), turn reker ox off, nd unplug the power ord. Do NOT disssemle iruit. 6) Using the preeding mesurements, determine P, S, S, S, S, pf, pf, pf, pf,,,,,,,,, (put in retngulr form), Q, Q, Q, nd Q. 7) Using,, nd, determine the mesured vlues of L, L, nd L. How do they ompre with Re R Rw? the leled vlues? Does Re R Rw,, Re R Rw,, nd, 8) Tulte nominl vlues nd lulted nswers from prt 2 of the preliminry nd experiment 2 (e.g., olumn 1 quntity nme, olumn 2 prt 2 nswer, olumn 3 experiment 2 nswer, & olumn 4 % differene, exept for omplex numers). List in order mesured/lulted in experiment 2. How do the lulted nd mesured quntities ompre? Disuss disrepnies.
4 ee330_spring2012_l_01_3phse_lods.do 4/5 Experiment 3 1) Connet lned threephse iruit with lod impednes eh onsisting of ~100 lod impednes in series with n indutor. Reord the leled vlues of L, L, nd L. Mesure nd reord the d resistnes of the ~100 lods in series with the indutors, i.e., R R w,, R R w,, nd R R w,. lok digrm of the neessry onnetions, inluding wttmeters nd mmeters, is shown in Fig. 3. Do NOT plug in the power ord. Threephse Wll Outlet Plug Power Cord Green ground ( n) left open wttmeter (phse ) white/red/lk Breker Box wttmeter (phse ) white/red/lk Vri White phse white/red/lk Red phse wttmeter (phse ) Blk (phse ) ~ 10 ~ 10 ~ 10 ERO ERO ERO ~ 200 V ~ 200 V ~ 200 V ~ 600 V ~ 600 V ~ 600 V I 2000 W I 2000 W I 2000 W II 6000W II 6000W II 6000W LOD LOD LOD COM COM COM V V V Figure 3 Blned threephse iruit for experiment 4. 2) fter ensuring the reker ox is off nd tht the vri is set to 0 (ll the wy CCW), plug in the power ord. If neessry, turn on nd zero the wttmeters in I mode. Then, put the wttmeters in 200 V mode to mesure the linetoline/phse voltges. Turn on nd ensure eh mmeter (multimeter) is properly onneted nd set for urrent. Turn the reker ox on nd slowly inrese the vri setting until linetoline voltges of ~90 V rms re hieved. 3) Mesure nd reord the tul linetoline/phse voltges V, V, & V. Put the wttmeters in 10 mode. Mesure nd reord the phse urrents I, I, & I. Put the wttmeters in 2000 W mode. Mesure nd reord the phse powers P, P, & P. 4) Using the mmeters, mesure nd reord the line urrents I, I, nd I. 5) Set the vri to 0 (i.e., rotte dil/kno ll the wy CCW), turn reker ox off, nd unplug the power ord. Do NOT disssemle iruit. 6) Using the preeding mesurements, determine the totl power P, pprent powers S, S, & S, totl pprent power S, power ftors pf, pf, & pf, overll power ftor pf, impedne phse
5 ee330_spring2012_l_01_3phse_lods.do 5/5 ngles,, &, lod impedne mgnitudes,, &, omplex impednes,, & (put in retngulr form), retive phse powers Q, Q, & Q, nd totl retive power Q. 7) Using,, &, determine the mesured vlues of L, L, nd L. Compre with the leled vlues. Does Re R Rw,, Re R Rw,, nd R R, Re w? 8) Tulte nominl vlues nd lulted nswers from prt 3 of the preliminry nd experiment 3 (e.g., olumn 1 quntity nme, olumn 2 prt 3 nswer, olumn 3 experiment 3 nswer, & olumn 4 % differene, exept for omplex numers). List in order mesured/lulted in experiment 3. How do the lulted nd mesured quntities ompre? Disuss disrepnies. Summry nd Conlusions Summrize nd disuss signifint findings. re your results onsistent with theory? Why/why not? L Report The results should e orgnized into typed short report onsisting of Cover Pge, Introdution, Body roken down into susetions/prgrphs sed on the steps in the lortory, nd Summry & Conlusions. Where possile tulte results. Unless otherwise speified, follow formt guidelines ontined in ourse syllus. Put the lultions, results, nd plots/figures in the ody of the report in the order speified. ppendies re NOT to e used s dumping ground for the lultions, results, nd figures. However, long mthemtil derivtions my e tthed s ppendies if referened in the text of the report. Your logook is definitely referene item. Due Mondy, Ferury 6, 2012 y 3 pm. Deliver l report nd logook t lss, to my offie (EP325), or milox in ECE offie.
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