exp 47 DONE

exp 47 DONE - Three-Phase Power Measurement flEJEUflVE '...

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Unformatted text preview: Three-Phase Power Measurement flEJEUflVE ' To meeeure power in e three-pheee circuit using the two urethnetar method. - To determine the active and reactive pet-war, and the power factor of e three— pheae eyatarn. DISCUSSION A wettmetar. ueadtor maeauring piW-I'Bt. teen etectrodynemomotartype Instmment. This meter ueuathr has two outs. one fixed. the other We of tun-linger. the magnetic field ofthetiret'l‘he lhced cfitieoeru‘ieeted in series with fl'iellneee as to carry the line current. The mettle on"I which is at high reeletanee. is oormaetad macho lead that portion oltha circuit in which the cooler [etc be measured}. The small current in the coil is, thereto—re. proportional to the voltage between these tenninele. Thule coil tome against a hallsal spring, and. since tonque Is proportional to the product of the values of the wrrertle in the I'M) eoiie. t! ie preportiona] to the product of the current I and the voltage E. The scale may. therefore. he graduated diraelty in watts. See Figure 4?~1.‘i'hefixed mnerit coit A sl in series with the lead. and the movable voltage coil in! is moss load. The resetting deflection is directlyr preporticnoi to the active power delivered to the load. l‘_...-.-..~...--.-.-.-.--.-—I Faun Ed. I! the power delivered by e fl'lree—phaee, four-wire system is to he meaeuied. we simply use three single-phase wsthnetars connected as shown in Figure 47 -2 and take the sure of their lncflvlduel matings. Three—Phase Power Measurement lT-i Ftuun :74 Homer. an e three-phase, film-mm ere-tam, my me sleet-a tiles-e team we metered tn mam the paw-er. See Hg;te4?—a.1'hememrrent autism eunenthrmeffielheeenflmeMUenegemflearemnnMedmme. remaining tine. Netettntmeunnecttente medetethe neutrat.1't1e tote! three-eh pmuer le equal tn the algebraic sum of the m weteneter madman. Flynn-EH1. Fewerde toads e1 unity pmfecter. the indications of the tune wettmetet be infer: the teed planer teeterte 50 percent. one meter wilt tndleete end the will indicate the total Wee-preee power. Almerfeetere bEt‘l'tIt'EE end 1130 pereent, me meter wtll mutate higher power than the ether. At Fl female lower ttnn 5L! pement. the Indeetien en ene :31 the mutate witl he nee end the tetel threenpheee power will. be the newer Indleeted by one mete! lee Identical hdharkme bill a .. . run I YewThree—Fheee Weemeter ie prefided with two Wfliimalflm and is ere-win thetyeuentyttevete cemeettttemree-pheee Hneetehtputtennmate 1. 25 Themedmnnectetefltemtetmineteafiema. Pdartty—merkedetlfl elm whetttertlte meter indleeflene ere poem or negative. Three+Phaee Fewer Measurement EQUIPMENT HEQHIRED Pieter to the Equipment UtiliZetion Chart. in Appendix A otthie manual, to obtain the list of equipment required to perform this exercise. PROCEDURE Chin'iflfl! nglt voltages are pmeni in this Expertmentl Do not make or modify my banana leek penneo‘liem with the power or: unless otherwieo spec-flied! U 1. Liean your ThreeLPheee Wattrneter, Power Supply. Resistive Lead. AG Ammeier. and AG IIr'oltnteter. oonneot the circuit ehovm in Figure 47—4. Figure 41-4. El 2. e. Setmereeieteneeofeeoheeeflontomflfl. 1:. Turn on the power eepptyr and Meet the fine voltage to EGG 'u" ee as indicated by 1.rottmeter V,. o. Meeeure and record the line current 11 end the power Indicated by Wt ' and W2. e. Fleturn the voltage to zero and turn ett the power supply. 47-3 ——_=_w 1hree~Phaee Power Measurement [21 3. a. From the reeutle of {e} eeimiate the 13¢: Apparent power {E1 1:: :1 3: new I “M -‘°»IA S: P=ELW Fewer renter PF -,_TS_ b. Ie the power feder eleee to unlhf? Explain. Wee END u ~( 2. 13E no El 4. e. Replace me resistance module with Ihe eepeuflenee module. '9. Setmereeeteneeefeeeheeetlenteaflufl. e. Repeat procedure 2. I1 =m_hee P: =flw P215“ w- Pi'l'Pz: d W d. From he reeufle at {e} calculate the 3th: Apparentpmer 0% H7 E S: VA 474 Three-Phase Power Measurement FLO-“EVE! DWI ¢ __.__. __ — F' =4fiw Pcwcrlactor__1f6¥_ PF: Heacfivepc—E 3151—?1 = g z_ 44°3— U: VHF I] 5. a. Replace the cecacltencc module with the inductance module. b. Setfl‘tarcactancacfeacfcactlcntcmfl. c. Flcpcatpmcedurcz. |1 =_d_‘fiac P1 ='L_(¢_w F‘2 -_{W P,+F',= I W kwuflv d. From the results at {c} calculate the 311:: mam power 47- Three-Phase Power Measurement 4H Reactive er m Q5??? = gZ/eg—m‘ Q=l£var RENEW DU ESHOHS 1 . 1mm wetuneters are used to measure total power in e Wee Wee-wire. system does each meter measure single-phase power? Explain. fi‘ree Ell-1e 2. What Is he emanne nf a negative Indication en 3 MW swig: (— ,f 3. Wuuld mymmmmbanaadad lemme the total mme-phaeepmar en a balanced maven-phase four—mm W? Explain. yYes Due 114a 'PF 1's E M7 N 4am—— 4. MustywmhuewemnMentommemmm-phaeamm batamedephaaammm7Em-Iah. ElYaa w l L Three-Phase Power Measurement 5. Can a wetlmeter Hut nae current through its current uni and a petemiei acme its wattage mil, indeele zero? Baez-Iain EYES :| NE: 4? -T ...
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This note was uploaded on 09/29/2008 for the course EEE 360 taught by Professor Gorur during the Spring '08 term at ASU.

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exp 47 DONE - Three-Phase Power Measurement flEJEUflVE '...

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