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quiz6d

# quiz6d - 1 L—\J EE 331 ‘(9 L Quiz 6 Name a I gs ‘1...

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Unformatted text preview: . . . . 1% L— \J ' October 14, 2002 EE 331 - ‘ . (9 L . ' Quiz 6 Name: a . - ' , I ' gs ‘1 Last First ‘1. ‘i / O ’ 1. a) What 3-phase connections come under Group I and Group H? . 2 pts. ' _ _ deHa— delta we sits ‘ we * W‘lnrf . am ~wye/ b) What is-the basic difference between the two groups? 2 pts.‘ \ Great: We IntorPDrM—Qg a Bob phage; Skiff—ii" ”/7 \Md‘ lewu'E— gnaw/71? 0) Are 3“. harmonics a problem in 3-phase transformer connections? Explain. _ - 2 pts. Moi ii“. \$91 are Leena-{drag} 1 ”1 U ‘1 (2., ,1 . _ r _ _ i . g . {berm-Jae. to Lie ?{Di)1d : Z ‘3. ..-,Q.S?a_«¥ra_~. ”5% “ﬂag 4'”? %‘- I (i x 11:” "3’11 \$03 '5 CA 51:253- .-1 I :4 {infee‘vg L‘Q m 44%;. )< +L‘ur5}. Ma r WED/1 we I y") 322)]; pause -. ﬁre We: W1 Lag-L‘s: U“; “- ‘Jer e ‘12: he 2 Fur {rm Jere 4“"?! Fa “95‘4wa 3:. 2. Three sing1e«phase transformers ”form a 3—phase transformer bank. Each transfonner is rated: 30 KVA,.2400/120V. Ifthe bank is to supply a 3 phase load of 90 KVA U = 5. '1 i 208 V iine at a pf of 0.9 lagging from a 3-pha-se. supply of \$15] KV ﬁne, ﬁnd the ’ '(1 7K AL“- P93 glowing: (a) The connection on the HV and LV sides. (13) Winding currents. w. if 00 if er”- 1.313:an phase voltages-(d) Power-and reactive power per transformer. V ' ._ (e) Breaker capacity on the HV and LV sides. 6 pts. .' ' -x/ y = ' cos' or 335.8 . 30 A. . - -. .. -a-w<v-- " Kine v /\ 'ta ¥§ ’35: H.) 2%0 . p: ”[3 \th} C2336}:- BHBSK: ”35714263 ,5 vtuu=3i9°JﬁH - ‘W rﬁaa kiw - 3 w easy Capicﬁ‘r .. . I ~ It. MAW if CM 1L strawmmmsiegaq \ ...
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