SETTINGS FOR 247 MW GENERATOR PROTECTION PANEL
CUSTOMER : NEYVELI LIGNITE CORPORATION
PROJECT: NLC-Retrofitting of Generator Protection . Generator ata recei!e" fro# c$%to#er:
Gen.Capacity Rated Power Factor Gen.Capacity at 0.85 PF
= 247 MVA = 0.85 = 210 MW
er!ina" Vo"ta#e
= 15.75$V%110V
&ync'rono() reactance *d
= 2.05 p( = 2.05 + 15.75 + 15.75%247 MVA = 2.058 o'!.
ran)ient reactance *d,
= 0.217 p( = 0.217 + 15.75 + 15.75%247 MVA = 0.217 o'!)
&(- tran)ient reactance *d,,
= 0.105 p(
C%P etai")/ Generator P'a)e C % e(tra" pri P'a)e C % e(tra" )ec
= 10000 A =5A
Generator P ratio
= 15.75 $V% % 110V%
C%P Ratio
= 1.37
N$#erica& Generator Protection-MICOM P'('
A"" )ettin#) in )econdary a"(e)6 )* Generator "ifferentia& +,G*
Gen. FC
= 247 + 10 % √ + 15.75 + 10 = 3055 A
Re9erred to )ec
= 3055 % 10000%5
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= 4.5 A a.ia%e" "ifferentia& &ince we are )ettin# t'e re"ay a) :ia)ed di99erentia" we ()e t'e 9o""owin# )ettin#)
'e !ini!(! Pic;<(p c(rrent ) 1 6
= 10>
'e 9ir)t )"ope 9or t'e di99erentia" 9or 9a("t c(rrent) near to rated c(rrent $16 = 0 > to ac'iee !a+i!(! )en)itiity? t'e a"(e i) )et to @ero or no -ia)6 'e pic;<(p )ettin# at w'ic' -ia) i) c'an#ed to 'i#'er &"ope ) 2 6
= 120>
'e )"ope o9 t'e -ia) c'aracteri)tic) to ta;e care o9 )eere 9a("t) $2 6 = 150 > to ac'iee c"ear di)cri!ination 9or !inor (n-a"ance) ca()ed d(rin# e+tre!e 9a("t condition) 6 Acti!e %etting%
Gro$/ )
Geni99 F(nction Percenta#e :ia) Gen i99 )1 0.45A 9or !a+i!(! windin# coera#e6 Gen i99 ;1 0> 9or !a+i!(! )en)itiity6 Gen i99 )2 5.4A to a""ow con)i)tent )en)itiity 9or a"" interna" 9a("t)6 Gen i99 ;2 150.0> .0ig1 I#/e"ence
Gen. FC
= 247 + 10 % √ + 15.75 + 10 = 3055 A
Re9erred to )ec
= 3055 % 10000%5 = 4.5 A &ince we are )ettin# t'e re"ay a) i#' !pedance i99erentia" we ()e t'e Fo""owin# )ettin#. Ma+i!(! Va"(e o9 t'e t'ree p'a)e )y!!etrica" )'ort circ(it c(rrent Fa("t c(rrent re9erred to t'e )econdary Vo"ta#e dee"oped acro)) t'e re"ay circ(it Vr =$9 + RC B 2 R6 ote/ RC and R are a))(!ed? a) it i) not aai"a-"e6
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Acti!e %etting%
Gro$/ )
Gen i99 F(nction/ i#' !pedance Gen i99 ) / 250 !A 2* Lo%% of E3citation +(4*
ran)9or!ation Ratio
= C Ratio % P Ratio = 1.37
ia!eter o9 circ"e
= *d + 1.37 = 2.058 + 1.37 = 28.75 o'!
99)et
= 0.5 + *d, + 1.37 = 0.5 + 0.217 + 1.37 = 1.52 o'!
a.Lo%% of E3citation 5it1o$t Un"er !o&tage FFai" A"! &tat() Dna-"ed FFai" A"! An#"e 15.00 de# FFai" A"! e"ay 5.000 ) 'i) )ettin# i) eE(ia"ent to a power 9actor o9 0.3 "eadin# and need to -e c'ec;ed wit' operatin# power 9actor at nor!a" r(nnin# condition) FFai"1 &tat() Dna-"ed FFai"1 <*a1 1.52 o'! <*a1 = 0.5 *d, in )econdary o'!)6 FFai"1 *-1 28.75 '! *-1 = *d in )econdary o'!)6 FFai"1 i!ee"ay 2.00 ) FFai"1 i!er 2 )
.Lo%% of E3citation 5it1 Un"er !o&tage FFai"2 &tat() Dna-"ed F9ai"2 *a2 1.52 o'! <*a2 = 0.5 *d, in )econdary o'!)6 F9ai"2 *-2 28.75 '! *-2 = *d in )econdary o'!)6 F9ai"2 i!ee"ay 1.00 )<<< CUSTOMER RECOMMNAE 4.46S* F9ai"2 i!er 2 )---+CUSTOMER RECOMMNAE 4.44S* Un"er Vo&tage +2*
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&ta#e 1/ nder o"ta#e at 70 > DR VAGD VH Mea)(rIt Mode P'a)e<e(tra" VH perate Mode Any P'a)e VH1 F(nction VH1 Vo"ta#e &et 44.00 V VH1 i!e e"ay 0.00 )---+CUSTOMER RECOMMNAE 4.46S* VH1 Po"edead n' Dna-"ed VH2 &tat() i)a-"ed Note: T1e ao!e Un"er !o&tage %tage 1a% to e $%e" for Lo%% of E3citation 7it1 Un"er Vo&tage * O!er!o&tage +68*
&ta#e 1/ er o"ta#e at 120 > "ow )et6 VDRVAGD VJ Mea)(rIt Mode P'a)e
(* Un"er 9 O!erfre$enc; +,) U
DR FRDKDCL FH1 &tat() Dna-"ed FH1 &ettin# 43.0 @ FH1 i!e e"ay 1.000 ) FH2 &tat() Dna-"ed FH2 &ettin# 48.0 @ FH2 i!e e"ay 0.000 ) FH &tat() i)a-"ed FH4 &tat() i)a-"ed ---+CUSTOMER RECOMMNAE * FH1 FH1 FH1 FH2 FH
&tat() Dna-"ed &ettin# 47.00 @ i!e e"ay .000 ) &tat() i)a-"ed &tat() i)a-"ed
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FH4 &tat() i)a-"ed FH F(nction in; 0000 VDR FRDKDCL FJ1 &tat() i)a-"ed FJ2 &tat() i)a-"ed
6* Negati!e /1a%e %e$ence t1er#a& /rotection +(=*
A))(!in# t'e contin(o() P& wit')tand o9 t'e #enerator = 8> And t'e t'er!a" ti!e con)tant = 20 2J1 2J1 2J1 2J2 2J2 2J2 2J2 2J2 2J2
A"ar! Dna-"ed C(rrent &et 0.25 A i!e e"ay / 5) rip Dna-"ed C(rrent &et 0. A ; &ettin# 1.8 ;RD&D 1.8 tMA* 500.00 ) tM 0.25 )
tM / 'i) a"(e 'a) -een c'o)en wit' t'e a))(!ption t'at t'e !ac'ine can wit')tand 0.5 p( o9 (n-a"ance 9or a period o9 500 )ec. tM /'i) )ettin# 'a) to -e c'o)en a) to co
C(rrent &et 250.0!A i!e e"ay 5.000 ) rip Dna-"ed C(rrent &et 50.0!A ; &ettin# 4.00 ) ;RD&D 4.00 ) tMA* 2000 ) tM 250.0!)
=* SYSTEM >AC?UP /rotection
:ac;(p F(nction / nder i!pedance Vector Rotation one 1H )ettin# 12.15 o'!) 1H ti!e de"ay 5.000 )ec 1H tRD&D 0 )ec 2H )ettin# 17.00 o'!) 2H ti!e de"ay 1.000 )ec 2H tRD&D 0 )ec ---+CUSTOMER RECOMMNAE * Vector Rotation one H1 &ettin# 1.200 '! H1 i!e e"ay 1.750 ) H1 tRD&D 0) H &ta#e2 Dna-"ed
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H2 &ettin# 1.700 '! H2 i!e e"ay .000 ) H2 tRD&D 0)
'e i!pedance a"(e i) )et at 70> o9 t'e "oad i!pedance a9ter ta;in# care o9 0> oer"oadin# 9or a )'ort d(ration? o"ta#e ariation) etc. * Re!er%e Po7er Protection +'2R* Stage ) +'2-)* A))(!in# !ore t'en 2> o9 power "ee" co("d re)("t in dan#ero() oer )peed tran)ient on "o)) o9 e"ectrica" "oadin#.
Power protection )ettin#)/ Power1 F(nction Reer)e
,* Lo7 @or7ar" Po7er Protection +'2L*
Power2 F(nction ow Forward PH2 &ettin# 40. W Power2 i!ee"ay 2.000 ) Power2 i!er 0 ) P2 Po"edead n' Dna-"ed 8. Generator Stan" ; Eart1 @a$&t Protection +6)NG*
J np(t J1 F(nction J1 C(rrent
Mea)(red 50.00!A
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J1 i!e e"ay .000 )-+CUSTOMER RECOMMNAE ).4%* J1 tRD&D 0) )4* 86 Stator Eart1 @a$&t Protection +=(G)* VJ np(t
Mea)(red VJ1 F(nction VJ1 C(rrent 5V VJ1 i!e e"ay .000 )-+CUSTOMER RECOMMNAE 4.6%* VJ1 tRD&D 0) VJ2 &tat() i)a-"ed 'e pic; (p )ettin# !ay -e ;ept to 5 o"t) )o a) to proide !a+i!(! coera#e o9 t'e )tator windin# toward) eart' 9a("t) and i9 t'e )tandin# o"ta#e "ee" i) 'i#'er t'an t'i)? Vo"ta#e )ettin# )'o("d -e increa)ed accordin#"y. ))* )44 Stator Eart1 @a$&t Protection+=(G2*
VH/ Dna-"ed VH Vo"ta#e &ettin#/ 2 V -+CUSTOMER
RECOMMNAE ).4V* VH i!e e"ay .000 ) VH n'i-it &et / 80 V PH n'i-it &et / i)a-"ed KH n'i-it &et / i)a-"ed &H n'i-it &et / i)a-"ed
ote/eed to -e )et d(rin# co!!i))ionin# a) per t'e !ac'ine t'ird 'ar!onic capa-i"ity )2* S$/er!i%ion+=4@L*
V &(peri)ion/ Dna-"ed V& &tat() / :"oc;in# V& Re)et i!e e"ay /< 5 &ec V& J n'i-it / 20 A -+CUSTOMER RECOMMNAE 6.4A* V& 2J n'i-it / 0.15 A -+CUSTOMER RECOMMNAE 4.26A*
C &(peri)ion / i)a-"ed )'* Po&e S&i//ing +, * Po&e S&i//ing +, * ata o9 t'e #enerator and )tep (p tran)9or!er / :a)e power Pn = 247 MVA :a)e o"ta#e Vn = 15.75 $V
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&y)te! i!pedance an#"e 80 F("" "oad c(rrent =3050 A :a)e i!pedance = 15.75 N15.75%247 =1.005 Generator ran)ient i!pedance *d,= :a)e i!pedance%.8 =1.005%.8 =0.245 w'ere .8=ran)ient c(rrent o9 p'a)e )'ort circ(it6 &y)te! i!pedance = 15.75 + 15.75 % 40 + 1.72 + 400 A))(!in# wor)t ca)e o9 40$A6 = 0.0083 '!) 'e -a)e i!pedance i) -a)e = Vn %Pn = 15.75 2 %247 = 1.005 '!) . A = * B *16 -a)e = 0.14 B0.00836 + 1.005 = 0.1483 D+/ &ec a"(e=0.1483NCR%PR= 2.08 '!6 : = 2*,d + -a)e = 2 + 0.245 + 1.005 = 0.51 . c i) )et to 30> o9 t'e tran)9or!er reactance c = 0.3 + *6 -a)e = 0.3 + 0.14 + 1.005= 0.12 en) An#"e :"inder An#"e
= =
120 de#ree) 75 de#ree)
1 and 2 are )et to 15 !) and )y)te! i!pedance an#"e i) )et to 80 de#ree) P&"ip a Forward 2.100 '! P&"ip - Reer)e 7.400 '! en) An#"e 120.0 de# P&"ip i!er 1 15.00!) P&"ip i!er 2 15.00!) :"inder An#"e 75.00 de# P&"ip c 1.800 '! one1 &"ip Co(nt 1 one2 &"ip Co(nt 2 P&"ip Re)et i!e 0.00 )
* SYSTEM >AC?UP /rotection
:ac;(p F(nction nder i!pedance Vector Rotation one H )ettin# 8 o'!) H ti!e de"ay 1.000 )ec H tRD&D 0 )ec 'i) ti!e de"ay )'o("d -e co
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t=0.11815 + 126 2%140 =14.7 o'!) on 12 $V -a)e 6 =28.425B14.7=4.12 =4.12%126 2%1162 =0.233 o'!) on 11 $V -a)e 6 =+CR%PR=0.233 +1=4.73 '! &econdary. Mac'ine 9("" "oad c(rrent = 7217.03 A C ratio = 8000%5 A Con)iderin# a 20> oer"aod on t'e #enerator/ Generator 9("" "oad )econdary c(rrent = 1.2 + 5 + 7217.03 <<<<<<<<<<<<<<<<<<< = 5.4128 A 8?000 Generator 9("" "oad i!pedance p'a)e to ne(tra"6 = 110 % 5.4128 = 20.8 o'!) P"ea)e note t'at 9("" "oad i!pedance o9 t'e #enerator i) 20.8'!) -(t t'e i!pedance reE(ired to coer entire "ine (nder !a+i!(! #eneration condition i) 4.73o'!). &o we can #ie a )ettin# o9 8 '!). )4* Po7er "eca; < Lo7 for7ar" /o7er +'2LT*
A))(!in# !ore t'en 2> o9 power "ee" co("d re)("t in dan#ero() oer)peed tran)ient on "o)) o9 e"ectrica" "oadin#. Power protection )ettin#)/ Power1 F(nction "ow 9orward
J VH P(
450!A 80 Vo"t) 5)ec 500!)ec
2. Rotor Eart1fa$&t Protection BM'IPG2A STAGE )
RH?A"ar! i!e de"ay RHH?rip i!e de"ay
4$ '!) 1.00 )ec 1; '!) 5.00 &ec
STAGE 2 RH?A"ar! i!e de"ay RHH?rip i!e de"ay
4$ '!) 1.00 )ec 1; '!) 5.00 )ec
'. Re!er%eD &o7 for7ar" /o7er Protection - M5TU)(
Reer)e power2G6 'e reer)e power protection )'a"" -e )et to 0.5 > o9 rated power. 'i) corre)pond) to
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= 0.005 + MVA + 1000000 + CR + PR % = 0.005 + 17.5 + 1000000 + 5%80006 + 110%110006 % = 1.4W V Co)∅ = 1.4 = 1.4 % .5 + 16 = 0.02204A = 22.04!A &et at 12.5!A t= 5.0 )ecO 'i) a"(e 'a) -een #ien (nder t'e a))(!ption t'at Generator reer)e power wit' )tand c'aracteri)tic) i) eE(a" to 0.5> . ow Forward power 'e "ow 9orward power protection )'a"" -e )et to 1 > o9 rated power. 'i) corre)pond) to = 0.01 + MVA + 1000000 + CR + PR % = 0.01 + 17.5 + 1000000 + 5%80006 + 110%110006 % = 2.8W t= 5.0 )ecO V Co)∅ = 2.8 = 2.8 % .5 + 16 = 0.02204A = 44.03 !A &et at Coar)e )ettin# = 7.5!A Fine )ettin# = 5!A t= 5.0 )ecO
'. O!era&& "ifferentia& Protection B?>C0)'4
Pic;<(p )ettin# / 0.2 p.( A))(!in# t'at 20> pic; (p wi"" en)(re )en)itiity to interna" 9a("t) -y con)iderin# 15> !i)!atc' d(e to tap ran#er and 5> o9 C error). Ratio Correction/
=
= 140MVA % 11√ 748A
=
= 748 + 5%8000 4.53 A
=
= 748 + 5%8000 4.53 A
=
= 140MVA % 18√ 585.7A
= =
585.7 + 1%800 0.72 A
11$V F("" "oad c(rrent &econdary c(rrent V1 &econdary c(rrent V2 A6
18$V F("" "oad c(rrent &econdary c(rrent
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&econdary c(rrent on V )ide o9 C
V1 Ratio correction 9actor
= = =
5 % 4.53 1.08
=
= 1.08
=
5 % .23
=
1.513
V2 A6 Ratio correction 9actor V Ratio correction 9actor
0.72+ 2. + √
= .23
5 % 4.53
Vector correction / Ly0 Ly0 Ly0
CR 8000%5 CR 8000%5 CR 800%1
RDF Protection/ 0.1 R)ta- = 9 Rct B 2R"6 % 0.1 9 = "oad % > = 140 + 10 % √ + 18 + 10 6%.11815 = 4357.55 A Re9erred to )econdary = 4357.55 + 1%800 = .13 R)ta- = =
9 Rct B 2R"6 % 0.1 .13 1.78B2+1.86
= . '!)
(. Generator Interfa$&t B VG)(
&ettin#/ A))(!in# !a+i!(! )tandin# o"ta#e "ee" i) -e"ow 5.4V )et at V=5.4V M& = 0.1 (. GT O
G erc(rrent )ettin#/ G FC
= 140 + 10 % √ + 18 + 10 = 585.7 A
Re9erred to )ec
= 585.7 % 800%1 = 0.72 A
A))(!in# 110> oer"oad o9 9("" "oad c(rrent 1.10 + 585.7 = 44.A Re9erred to )econdary = 44. + 1 %800 = 0.805A
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&tand-y Dart'9a("t )ettin#/ 20> 9("" "oad c(rrent 0.2 + 585.7 = 117.14A Re9erred to )econdary = 117.14 + 1%800 = 0.15A 6 UAT ifferentia& Protection - ?>C0)24
Pic;<(p )ettin# / 0.2 p.( A))(!in# t'at 20> pic; (p wi"" en)(re )en)itiity to interna" 9a("t) -y con)iderin# 15> !i)!atc' d(e to tap ran#er and 5> o9 C error). Ratio Correction/
=
= 15MVA % .8√ 127.A
= =
127. + 5%1500 4.24 A
=
= 15MVA % 11√ 787.A
= =
787. + 5%1000 .35 A
=
= 5 % 4.24 1.173
.8$V F("" "oad c(rrent &econdary c(rrent
11$V F("" "oad c(rrent &econdary c(rrent V Ratio correction 9actor V Ratio correction 9actor
= =
1.27
Vector correction / Ly0 Ly0
CR 1000%5 CR 1500%5
(. UAT O
G erc(rrent )ettin#/ MVA Ratin# o9 A C Ratio Vo"ta#e "ee" A FC
= 15MVA = 1000%5A = 11$V = 15 + 10 % √ + 11 + 10 = 787. A
Re9erred to )ec
= 787. % 1000%5 = .3 A
A))(!in# 110> oer"oad o9 9("" "oad c(rrent
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5 % .3
1.10 + 787. = 8.0A Re9erred to )econdary = 8.0+ 5 %1000 = 4.A &tand-y Dart'9a("t )ettin#/ 20> 9("" "oad c(rrent 0.2 + 787. = 157.4 Re9erred to )econdary = 157.4 + 5%1000 = 0.787A
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