ECE_451_Lec_4

ECE_451_Lec_4 - ECE 451 Class Notes for Lecture 4...

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Unformatted text preview: ECE 451 Class Notes for Lecture 4 Three-Phase Transformers: Phase Shift and Per-Unit Calculations SEC. 2. B VAB A VBC VCA C c VRH; Ran-2b L-L VOLTAGE MMNITuBE on flyst V“: n u u u y .. XA‘ =2 N. = @' _ Yfi' Va N2 5 N2 RL VRH : VRL + o n 4. HV —— LV PHASE SHIFT FIGURE 2.15 Wiring diagram for a three-phase transformer connected A-Y where the A side is the high-voltage side. B a V66 [7 VAB A Vac v” Vac VCA C c VAC = E. __, VAB 1:600 \r3- VA '30" _ N1 I TRANSFORMEPs AND PEP um 12* AIg I o + + 2' + 0 g 1 + n 1 N2 N.: N2 4. CHOOSE (VAL,ME 1’HE SAME ON 80TH 5H)“ t. .— c 2' HOUSE Mm“ NJ :2 4477b MK WEB VDHWQS V2 base N 2 m 2 (v b J l q = I a = -— E1 b 5e VA lam N1 base l ‘ I l 91; u 02?}, £5": ‘ _UIafu_7 E. Pu + + 2'2. {N + VI Pu V2 Pu VI Pu V2 {m ——0- "fl 3 2| P” " Z7- ?“ = 21" Pu I! fu I2- {Du .. o——C:I——————o » + 27 pa + V, W V1,)“ 39$ TRANS FORMERS AMI) PER umT Lv~ NMMIOM Van ‘ MRCTN‘TubE OF RATED L-L VOLTAGE ON \iy 51m; . LV RL ' - EACH 39$ TRANSFORMER HA5 PEP-PHASE EeuwALENT D VRuzvRL V3H : VRL + . . + + . 0 EL + VA Va. VA i Va 0 CHOOSE base {HE SAME ON BOTH 51QES (HEN ZH base 3 %Lb 4—— IAPu ~> IL + L Pu + \/A Pu V0. Pu 3gb BASES - Ru. WA” = E ‘IAHWAN kVA bu)“: E Imam kVAS/baée hVA 1AM 54““ (A) 4.. ’ \E k,VABfimse Yin- => Z :. VAN,bq:e _ VAB,E~9$: IA be“. I — A)bcz$e E; lAJbau = h‘VABfiasz 3‘ 103 RVA base,3¢ kvw,ba$¢ \/ .32 $ 21“, __ VAslbasz _ J? Rvfizfimxmg IAB (51A T ‘ m ~AB, bqsz IA,\94$L = 3 <kVABlbau> Z MVA base 84> 4(0) = gym- 3 ' 3 /Zba$e 219a? - Y PU ...
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This note was uploaded on 09/15/2011 for the course ECE 451 taught by Professor Johngrainger during the Fall '11 term at N.C. State.

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ECE_451_Lec_4 - ECE 451 Class Notes for Lecture 4...

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