Click to edit Master subtitle style 5/3/12 Power System-III By J.SOMLAL, M.Tech.,(Ph.D), MISTE, MIETE, Assistant Professor, EEE Department, K L University, Vaddeshwar am, Vijayawada, Andhra Pradesh-522502 Web: http://www.kluniversity.in Mobile No:9989743653
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v The $iese0 e0ectric 0ocomoti"e 1ses a $iese0en9ine to $ri"e an e0ectric 9enerator, %hich thens1pp0ies the c1rrent to traction motors, %hich are9eare$ $irect0y to the 0ocomoti"e?s %hee0s.
Ø In In$ia, the $iese0 0ocomoti"es %ere intro$1ce$in =36 for sh1ntin9 p1rposes on roa$ 9a19esection an$ in =38 for main 0ine ser"ices on
me$i1m 9a19e section. The $iese0 e0ectric0ocomoti"es emp0oye$ in practice are of thefo00o%in9 types-
Ø
=. Main 0ine $iese0 e0ectric 0ocomoti"e ha"in9en ines of o1t 1t not e:cee$in =** /+ an$
• AD#A2TA@ESØ Since e0ectric motors are 1se$ as the $ri"es , the
system is c0ean an$ po001tion free. Startin9 tor;1e
is hi9h, so hi9h acce0eration is possi0e. Spee$contro0 is "ery simp0e. Bra/in9 is simp0e an$efficient. E0ectric ra/in9 is 1se$ in this case%hich is s1perior to mechanica0 ra/in9 1se$ ysteam an$ $iese0 0ocomoti"es. It is possi0e toapp0y re9enerati"e ra/in9 %hich has thefo00o%in9 a$"anta9es
ü Ao"e 4* of ener9y spent $1rin9ascent(1p%ar$ mo"ement) is p1mpe$ ac/ $1rin9$escent.
Present0y, fo00o%in9 fo1r types of trac/ e0ectrification
systems are a"ai0a0e-v %irect C$rrent System D> at 8**'5* # is
1ni"ersa00y emp0oye$ for tram%ays in 1ran areasan$ for many s11ran rai0%ays %hi0e =**'7***# $c is 1se$ for main 0ine rai0%ays. Lo% "o0ta9e $csystem is 1n$o1te$0y s1perior to sin90e phase acsystem for hea"y s11ran ser"ices.
v ./0 Sin+'e Phase AC System In this system acseries motors are 1se$ for 9ettin9 the necessarymoti"e po%er. The "o0ta9e emp0oye$ for
This system comines the a$"anta9es of h" ac$istri1tion system an$ $c series motors fortraction. The "o0ta9e 1se$ for o"erhea$$istri1tion system is /" at norma0 s1pp0y
fre;1ency of * F. The 0ocomoti"e carriestransformer an$ con"ertin9 machinery to step'$o%n the "o0ta9e an$ con"ert into $c. Thissystem of trac/ e0ectrification 1sin9 /", *F, sin90e phase ac s1pp0y has een a$opte$for a00 f1t1re trac/ e0ectrification in In$ia. Thea$"anta9es of s1ch a system are 0i9ht o"erhea$
Ø (iii) ree r1nnin9(t't7)-This perio$ occ1rs %henthe po%er o1tp1t from the $ri"in9 a:e0s a0ancesthe rate at %hich ener9y is e:pen$e$ a9ainst theresistance to motion.
Ø (i") >oastin9 perio$(t7't6)- At the en$ of freer1nnin9 perio$ , s1pp0y to the motors is c1t off an$
train is a00o%e$ to r1n 1n$er its o%n moment1m.
Ø (") Bra/in9 perio$(t6't)-At the en$ of coastin9 perio$, ra/es are app0ie$ to rin9 the train to
• THE SIEMENS EECT!IC !"I#"$ laiddo%& at t'e (erli& E)'ibitio& o* 1+,-.
T'e s'ort li&e %as about 00 yards
lo& a&d curre&t %as dra%& *ro at'ird rail bet%ee& t'e track %'ic'acted as t'e retur& to t'e dy&ao.
T'e locootive 'auled a a)iuo* soe t'irty 4asse&ers at a s4eedo* about *our iles a& 'our. T'is'istoric illustratio& s'o%s o&e o* t'eearliest trai&loads o* 4asse&ers