Starting currents of transformers : with special reference to transformers with silicon steel cores . full load current 24 or — .5 = 43 ohms in series with the 2200-volt winding, equation (11) reduces to A B = — Kz A (cos #) — -°5l K2 i. Case 2.—Negligible resistance outside Xh = ohms in series with the 2200 volt-winding, equation(11) becomes, neglecting resistance: A5 = — K2 A (cos 6) — .29 K2 (At).From Table 5, Columns 12-14, it may be seen that the maximum rushof current for Case 1 is amp., and for Case 2, 55 amp., i. e., in bothcases less than twic
Starting currents of transformers : with special reference to transformers with silicon steel cores . full load current 24 or — .5 = 43 ohms in series with the 2200-volt winding, equation (11) reduces to A B = — Kz A (cos #) — -°5l K2 i. Case 2.—Negligible resistance outside Xh = ohms in series with the 2200 volt-winding, equation(11) becomes, neglecting resistance: A5 = — K2 A (cos 6) — .29 K2 (At).From Table 5, Columns 12-14, it may be seen that the maximum rushof current for Case 1 is amp., and for Case 2, 55 amp., i. e., in bothcases less than twice full load current. From the above calculations, it may be seen that the initial rush ofcurrent upon closing the primary circuit of a transformer can be lim-ited to safe values by inserting either a resistance or an air core in-ductance in series with the primary circuit. In the particular casesabove, the current was limited to less than twice full load current by JThis resistance multiplied by full load current, , gives a drop equal tohalf normal voltage: = 55 ?fPllNOipOOOO 000H 0\ K H ir, ir, (vj fi N N N fi -I M + OOOOlOiO i q -rvq ©\ pi oc pi mo in in i in w in o o O >n>- -i n IMO Tf invd VC vO tO -fvd -4H N noo % ~ ^g g g> oocoioiflMTfo o + iJX i-O mo Q O O O OO q q m Troq tqio S>- « oqi-l oi pi pi nqqeoio5o 5ooo w PO O 1-1 VO O O Pi 00 I VO d - pi po »nvo K. q vq cq q\q\r-;.rNcoo\ovovo t^.o in. moo o o2 2 S SSNS 2. d\ food m *fvd oo cd od k ° o — OmOOOOOOOO N h 0,00 O VO w O O « pi pi p^ ^ tj- *f («i 0j o c o o o o o M PO I> P) In o o + O\00 VO>r*}PO<viOOOO »n q q\cq m o o q o w N CV1 PO^^tintnininTj--frn K?^00 °^ o\oo tN « CO CJv O lO m m + I I + fi „ ft*ftvg O O O O O O O O O O C O Oj 1 W o 0) o to O 2 o »=so — — 8 aSI S to 3 c/) O U u to ° IIto °5 , , <S1 — U _2 ; nU x = m to 1 ^ M d ° OCOOQOOmo COO0 On o\ o-oo o o»o S pi o + in in in in in inm io o ^oo ion NKUlOOKuliflO
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
