EE403.25 1Name:L. Ashok Raman.Designation : LecturerBranch : Electrical and Electronics Engg.Institute : Govt. Polytechnic Proddatur !ada"a Dist#emester : I$ #emester#u%&ect : A.'. (A')INE# * I#u%&ect 'ode: EE*+,-.o"ic : #ingle Phase .rans/ormersDuration : 0, (ins.#u% .o"ic: Pro%lems on .rans/ormer Losses.eaching Aids : PP. AnimationDEPARTMENT OF TECHNICAL EDUCATIONANDHRAPRADESH EE403.25 2Recap Losses occu !" #a"s$o%e.E$$!c!e"c& Co"'!#!o" o$ %a(!%u% E$$!c!e"c&O)*ec#!+eO" co%p,e#!o" o$ #-!s C,ass . &ou /!,, )e a),e #o u"'es#a"' Ho/ #o co%pu#e ,osses occu!"0 !" a #a"s$o%e.3 EE403.25DURATION TO CO1ER EACH TOPIC I"#o'uc#!o" 05M!".E(a%p,e po),e%s o" ,osses occu!"0 !" a #a"s$o%e35M!" Su%%a& a"' 2ues#!o"s 30M!".4 EE403.20RecapT-e ,osses occu!"0 !" a #a"s$o%e ae coe ,osses a"' coppe ,osses T-e #o#a, coe ,osses !ssu% o$ -&s#ee#!c Loss 45-6 a"' e''& cue"# Loss 45e6 !.e..5o o 5! 7 5- 8 5e 7 9- $ :%3.; 8 9e $2 :%2 /e a,so @ )o#- ,osses )e!"0 %easue' a# #-e sa%e pea< $,u( 'e"s!#&. Co%pu#e #-e -&s#ee#!c a"' e''& cue"# ,osses a# 50H>.EAAMPLEB 36 EE403.25C!+e" 'a#aDA# $ 7 40H> Io" ,oss o coe ,oss 5o 7 525A# $ 7 ;0H>Io" ,oss o coe ,oss 5o 7 ?05To#a, coe ,oss 5o 7 A$ 8 :$2/-ee A a"' : ae co"s#a"#s $o co"s#a"# $,u( 'e"s!#&So,u#!o"D7 EE403.251 2A 3 B//4hen / 5 +, )6 4e have07A 3 +,B********* 89:+,4hen / 5 ;, )6 4e have 0,5 702A 30001. 50H> supp,& a #a"s$o%e esu,#s !" ;505 -&s#ee#!c ,oss a"' 400A5 e''& cue"# ,oss. I$ )o#- #-e app,!e' +o,#a0e a"' $eEue"c& ae 'ou),e'. $!"' #-e "e/ coe ,ossesEAAMPLE B 210 EE403.25C!+e" 'a#aDA# 30001. $ 750H> H&s#ee#!c ,oss5-3 7 ;505E''& Cue"# ,oss5e3 7 4005So,u#!o"D11 EE403.25m9 9 m97 7 m 72e kno4 $E 5 +.++ B/ N A volts$ / B ? $ / B N and A are constants@= Q12 EE403.2579 799 9 m9m9 m79 9 m7$ 5 7$A / 5 7/$ / BB5 B7$ 7/ BI/ %oth a""lied voltage and /re=uency are dou%led.= 9.;hm9.; 9.;7 m7 9 m99.;9 m9hh7h92e kno4 that )ysteresis loss 25 ! / B2 /B 7/B 55 2 /B9.;9 m9 /BSo,u#!o"D13 EE403.257 7m7 7 7 77 m7 9 m97 79 m9h7h7e ee7e92 5 7;0, 25 ;0, > 7 5 9-,,22e kno4 that Eddy current loss 2 5 ! /B2 /B +/B55 2 /B7 79 m9 /Be7e72 5 ++,, 25 +,, > + 5 9;,,2So,u#!o"D14 EE403.25oh7 e7.otalcore loss at 9,,,$0,)625 23 2 5 9-,, 3 9;,, 5 7. De#e%!"e #-e -&s#ee#!c ,oss a"' e''& cue"# ,oss a# 2501.50H>.EAAMPLE B 315 EE403.25C!+e" 'a#aDA# 1 7 2501. $ 7 50H> Coe ,oss 5o 7 555A# 1 7 2001. $ 7 40H>Coe ,oss 5o 7 4355e