Specification of Excitation System

SPECIFICATION OF EXCITATION SYSTEM

GENERATOR CAPABILITY •

Generator Generator converts mechanical energy to electrical energy

•

Excitation System provides DIRECT CURRENT to the synchronous machine ield !inding"

GENERATOR CAPABILITY •

Generator Generator supplies #oth active and reactive po$er 

•

!hen connected to grid it either supplies or a#sor# reactive po$er 

•

!hen supplying reactive po$er it is lagging %Inductive&

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!hen a#sor#ing reactive po$er it is leading %capacitive&

EXCITATION SYSTEM a&

Excitation System

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'rushless System %'(E&

c&

Static System %SEE&

d&

Standards

e&

Trends

EXCITATION SYSTEM a&

Excitation System

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'rushless System %'(E&

c&

Static System %SEE&

d&

Standards

e&

Trends

EXCITATION SYSTEM Excitation System per)orms C*NTR*( and +R*TECTI,E )unctions essential to the satis)actory per)ormance o) +o$er System

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C*NTR*( 

Control o) ,oltage and . )lo$

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Enhancement o) System Sta#ility

+R*TECTI*N

Ensure Capa#ility (imits o) /achine are not exceeded"

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*ther E0uipment are $ithin sa)e operation"

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D1N2/IC C32R2CTERISTI,CS o) /odern E4C S1STE/S 

3IG3 Initial Response 

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%,oltage Response Time is the time in seconds )or E4C S1S to attain 567 o) Di)) #et$een ,c and ,r&" ,RT o) 8"9 sec or less 0uali)ies as 3igh and there)ore )ast acting"

E4C S1S Ceiling ,oltage 

/aximum direct voltage that E4C S1S is a#le to supply )rom its terminals under speci)ied conditions"

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E4C S1S Ceiling ,oltage 

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/aximum direct voltage that E4C S1S is a#le to supply )rom its terminals under speci)ied conditions"

E4C S1S Ceiling Current 

/aximum current that E4C S1S is a#le to supply )rom its terminals under speci)ied conditions"

Ceiling Voltage & Response Ratio b oa=ed= rated voltage

a

d

o

e

Eb=ceiling voltage oe- 0.5 secs.

Generator an its e!"itation s#ste$ rating •

Generator and its excitation system shall have a capa#ility at least matching the declared maximum continuous rated output o) the associated tur#ine at •

all po$er )actors #et$een 8":6 lagging and 8"56 leading

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 $ith ;= 67

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 com#ined voltage ? )re0uency variation o) 67"

Generator an its e!"itation s#ste$ rating •

 2lso the generator and its excitation system shall #e capa#le o) continuous sta#le operation at the pea@ output o) the associated steam tur#ine under V%O & P 'eater o(t "onitionA etc" as availa#le )or the secondary cooling $ater temperature o) c in case o) internal )ault" Repair $or@ can #e started $hen the m>c is in running condition" Simpli)ied #earing con)iguration  (ess #alance pro#lem on sha)t  Shorter TG sha)t=shorter TG )oundation and thus reduced civil structure

8(al C'annel S#ste$

T#pe AFT

%it' Re(nant T1in Con2erters :"ol stan3#0 -../ re(nan"it#0 a(to$ati" "'ange o2er;

UG IG

 2,R

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CR

UG IG

 2,R

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CR

 2,R  2utom" ,oltage Reg" CR  ield Current Reg"

VOLTAGE REG*LATOR -/(1$R *+*T$ *TA4''*$R .$$&TR(-$&#A)'&A (*&'AT'()* . F((1 2/ &()TR( . *((T# &#A)3$(V$R FR( 1(R5')3 T( *TA)4+.

-A2T(AT'& &#A)3$ (V$R FR( A2T(- T( A2T(-6 A) V'&$ V$R*A AT T#$ T'$ (F . (** (F T$R')A V(TA3$ F$$ 4A&5 . (** (F A2T(AT'& &#A))$ R$F. *'3)A . A)2A ')T$RV$)AT'().

EXCITATION SYSTEM a&

Excitation System incl 2,R

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'rushless System %'(E&

c&

Static System %SEE&

d&

Standards

e&

Trends

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IEC=88