emergency handling

8/12/2019 Emergency Handling

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TYPICAL EMERENCY HANDLINGBASED ON FSTPP STAGE-1)

1


2/29

INDEX

Sr.N

o.

Description Page No

1 One set of ID,FD,PA fan trip 1

2 Seal air fan trips & stan!" fails to start 2

# AP$ ele%tri% rie trippe & air 'otor fails to start #

EP trippe & stan!" EP fails to start

* +nit DDB failre *

+PS failre .

. Instr'ent air failre /

0 Total poer failre 1

/ +nit !s failre 111 3oss of %ontrol poer to E$ & TSI 1#

11 BFP 'aster spee %ontroller fails 4i54 1

12 Station sor%e to nit E6 fails 1*

1# IG7 of one ID fan 5ot e-lin8e 1

1 E9pansion tan8 a%' eteriorates 1.

1* S: flo lo at 4i54 %on%tiit" 10

1 Seal oil retrn line near pre-%4a'!er eelops lea8a5e 1/

1. AT;S failre 2

2


3/29

1. ONE SET O ID!D " PA AN TRIP#

Case1: ID&FD Fan trip

CONSE$%ENCE#

< +nesira!le frna%e pressre fl%tation

< Boiler=nit 'a" trip on frna%e pr lo-lo, all FD trip, all ID trip, fla'e failre

< +nit loa ill re%e to appro9 * >

ACTION#

? I''eiatel" release rnnin5 ID & PA fan to 'anal & aoi oerloain5

? I''eiatel" %t in sita!le oil eleations to aoi fla'e failre trip

? Ta8e t4e tr!ine on 4"rali% 5oernin5

? lose sper 4eater & re4eater atte'peration !lo%8 ales

? @eep on at%4in5 r' leel & BFP 'asters response If reCire

'anall" re%e t4e 'aster to aoi r' leel fl%tation

? @eep on at%4 on $P 4eater as it 'a" 5et !"passe

#


4/29

Case2: PA Fan trip

CONSE$%ENCE#

< Plerisers in e9%ess of t4ree ill trip fro' top

< 3oa %o'es on to appro9 *>

< $ot pri'ar" air 4eaer pressre 'a" ip & %ase PA 4eaer pressre lo

alar' at *0* ''%l

< Dis%4ar5e a'per of it %loses & IG7 %o'es to 'in position

ACTION#

? I''eiatel" release rnnin5 PA fan to 'anal & aoi oerloain5

? I''eiatel" %t in sita!le oil eleations to aoi fla'e failre trip

? 6ills in e9%ess of t4ree ill trip & if ne%essar" %t off anot4er 'ill

to 'aintain PA 4eaer pressre at . ''%l (If 'ill A, ,D,E,F ere

in seri%e 'ill E & F ill trip !" lo5i% & 'ill A 'a" !e %t off)

? 6aintain PA 4eaer pressre at . ''

? If t4e trippin5 is e to 4i54 !earin5 te'p %4e%8 t4e ini%ations lo%all" & in

+B ( Alar' %o'es !efore trippin5 at 0*)

? If trippin5 is e to lo l! oil pressre(12 @5) %4e%8 l! oil p'p s"ste'

? 6aintain frna%e ra54t !eteen -* to -1 ''%l

? 6aintain o9"5en !eteen #>-*> in t4e fle 5ases

&. SEAL AIR AN TRIPS " STAND'Y AN AILS TOSTART

CONSE$%ENCE#


5/29

< +nit 'a" trip on loss of all fel

< No 'ill 'a" trip on seal air to 'ill !ol DP

ACTION#

? I''eiatel" rs4 to t4e seal air fan & 8eep its s%tion &

is%4ar5e a'pers open

? Seal air is proie to preent %oal st fro' enterin5 into 'ill

5riners s4aft !earin5 & erti%al s4aft !earin5s In nor'al rnnin5

%onition seal air fan is%4ar5e 4eaer pressre is aron 1 ''%l &s%tion pressre is aron 1* ''%l (PA fan is%4ar5e %ol 4eaer)

4ereas 4ot PA is%4ar5e 4eaer pressre is aron 0* ''%l 6ill

PA ta8es s%tion fro' t4is 4eaer so t4e DP !eteen seal air & !ol is

ro54l" 2 ''%l So een if seal air fan are not rnnin5 & t4eir !ot4

inlet & otlet a'per are in open %onition a 'ill to seal air DP ill !e

present ,sa" 1*-2 ''%l 4i%4 is a!oe trippin5 ale of *of ater

%ol'n

?If nit trips, prepare for !oiler li54t-p after attainin5 aeCate seal

air to 'ill !ol DP

? ;e%o''en for seal air 4eaer pressre ini%ator & a''eter to !e

proie in all +B

? Get t4e ele%tri%al 'otor & its %a!le %4e%8e If one fan 4as 'otor

pro!le' & ot4er 4as %a!le falt 5et t4ose Ci%8l" %ross-fitte it4ot

%losin5 s%tion & is%4ar5e a'per 4e%8 for seal air 4eaer pressre is

nor'al

*


6/29

(. APH ELECTRIC DRI)E TRIPPED " AIR MOTOR

AILS TO START#

CONSE$%ENCE#

< Frna%e=fla'e 5et istr!e, epenin5 on fla'e %onition

< Boiler 'a" trip on fla'e failre, frna%e pressre 4i54=lo

< Fel ri%4 'i9tre 'a" %ase !oiler e9plosion

ACTION#

? If AP$ A trips %t ot 'ill A & B & %t in oil in sita!le eleation to preent

%ol air entr" in t4e frna%e

? If AP$ B trips %t ot 'ill E & F & %t in oil in sita!le eleation to preent

%ol air entr" in t4e frna%e

? ;e%e air flo !" re%in5 !lae pit%4 %ontrol of FD fan A or B for t4e

trippin5 of AP$ A or B respe%tiel" +nit loa %o'es on to *>->

? lose t4e !lo%8 ale of sper 4eater & re4eater atte'peration !lo%8 ale

? 4e%8 for seri%e air pressre & %o'pressor trippin5

? 4e%8 for line p of air 'otor

? If AP$ trippin5 is e to 4i54 !earin5 te'p (1%) %4e%8 for

? oolin5 ater flo & pressre

? start stan !" 3OP if not starte

? %4e%8 %ooler %4an5e oer alon5 it4 3OP %4an5e oer

*. CEP TRIPPED " STAND'Y CEP AILS TO START


7/29

CONSE$%ENCE#

< TG 'a" trip on ,lo a%', eaerator leel lo-lo, all BFP trip

< Boiler 'a" not trip on re4eater prote%tion as !ot4 EP naaila!le

< 7a%' ill eteriorate as 'ain ee%tor is stare fro' ater sie

< GS 4eaer pressre ill fl%tate & a%' eteriorate

< GS & rain %ooler 'a" a'a5e e to ater sie staration

ACTION#

? If EP trippin5 is fro' 4otell leel lo-lo, i''eiatel" open 4otell nor'al

'a8e-p fro' D6 plant (6-/) & 4otell e'er5en%" 'a8e-p fro' ST (6-

*)ST s4ol not !e fll" e'ptie

? If EP trips e to ot4er reason

? Tr" to start EP & 'ean4ile

? ta8e startin5 ee%tor in seri%e

? I''eiatel" %t off top 'ills & %t in all eleation oil 5ns

? re%e loa i''eiatel" to aron 6:

? @eep on at%4in5 r' leel & BFP 'asters response If

reCire 'anall" re%e t4e 'aster to aoi r' leel

fl%tation

? Open t4e !"pass of seal stea' lea8 off ale to 'aintain

4eaer pressre as stea' flo in GS as !e%o'e sta5nant Open

'al rain of t4at 4eaer

? t ot 3P$ fro' stea' sie? lose sper 4eater & re4eater atte'peration !lo%8 ale

? Deaerator leel ill %o'e on in * 'intesIn e9tre'e

%onition eaerator e'er5en%" 'a8e-p line fro' D6 plant

%an !e opene %atiosl" !e%ase of 4a''erin5

possi!ilit"

.


8/29

? If %onition oesnt i'proe, i''eiatel" 4an trip t4e !oiler as it ill not trip

on re-4eater prote%tion after tr!ine trip as 3P !"pass ill not open on !ot4 EP

trippin5

+. %NIT DCD' AIL%RE##

Case1# Ina,-ertent operation ea,ing to isoation o/ 0otCase1# Ina,-ertent operation ea,ing to isoation o/ 0ot

0atteries " cargers /ro2 DCD'0atteries " cargers /ro2 DCD'

CONSE$%ENCE#

< Trip %o''an 5oes to !oiler trippin5

3 Trippin5 of !oiler ill trip tr!ine

3 Generator ill not trip e to loss of D to G;P 4ile restoration ti'e is 'ore

tan 2 se%

ACTION#

? If t4e D sppl" %an !e restore it4ot an" ti'e ela", t4e 5enerator !rea8er

ill open & fiel !rea8er ill trip & s!seCent a%tion ill !e li8e %ase2

Case ire4/as o-er in DCD'Case ire4/as o-er in DCD'

CONSE$%ENCE#

< Boiler trip on loss of 227 D ( 2se%) & %onseCentl" tr!ine

< Generator ill not trip as D sppl" In G;P is lost & 'otorin5 ill ta8e pla%e

0


9/29

< Fiel !rea8er ill also !e in %lose %onition as e9%itation D sppl" is lost

< All $T ries & 3T ries it !rea8er 'oles %onne%te it4 nit

sit%45ear or nit seri%e sit%45ear ill %ontine to rn it4ot prote%tion till

5enerator !rea8er is in %lose %onition

< 3o5i% !oar & ele%tro'a5neti% !oar ill !e%o'e ea 7a%' !rea8er

%annot !e operate

< All station T & 3T !ses ill !e lie it4ot an" prote%tion

< D EOP, D seal oil p'p & D s%anner air fan ill not !e aaila!le

< $OT7 ill re'ain open !t $ON7 ill !e %lose

ACTION#

? Trip !ot4 t4e 5enerator !rea8ers fro' +B All nit !ses !e%o'e ea Trip

+AT in%o'er !rea8ers on 5enerator es8 panel (To preent ato %losre of station

in%o'er !rea8ers on restoration of D sppl" to sit%45ear)

? 4an5eoer D sor%es of @7 nit !s,station !s,nit seri%es sit%45ear

& E6 to ot4er sor%es :it4 restoration of D sppl" to ifferent sit%45ear all

'otor feeer !rea8ers ill trip !t nit in%o'ers & transfor'er feeer ill not trip

? 4ar5e +nit seri%es sit%45ear fro' station sppl" & restore sppl" to

TG6 & !oiler 6

? 4ar5e nit ele%tro'a5neti% !oar & lo5i% ! fro' alternate sppl"

? Trip 5enerator file !rea8er 'anall"

? Open a%' !rea8er

? Ensre t4at $P=3P !"pass ales are %lose !" 5iin5 %o''an to it

? Ensre seal & 3! oil s"ste's are in seri%e Barrin5 5ear 'a" 4ae to !e

opene 'anall" if sppl" to 3T s"ste's is not restore in ti'e? lose 'anal isolatin5 ales of $OT7 & $O;7 Ensre t4at all $ON7s are

%lose

? Ensre D sppl" is aaila!le t4ro54 t4e se%on sor%e in all @7

sit%45ear & 3T sit%45ear

/


10/29

? Ensre aeCate s%anner air pressre A s%anner air fan ill re'ain in seri%e

as E6 re'ains naffe%te it4 D failre it4 its is%4ar5e a'per in open

%onition Dis%4ar5e a'per 4as to !e opene 'anall" as its sppl" is fro' FSSS

D sppl" (227)It %an !e operate 'anall" if aeCate air pressre is aaila!le

? Infor' & I 'aintenan%e for nor'aliHation of +PS %4ar5er

Case(# %nit DCD' /ai5re aong 6it gri, /ai5reCase(# %nit DCD' /ai5re aong 6it gri, /ai5re

CONSE$%ENCE#

< Boiler & tr!ine ill trip

< Generator & fiel !rea8er ill not trip

< All @7 !ses alon5 it4 3T !ses ill !e%o'e ea it4 !rea8ers in

%lose %onition

< Ele%tro'a5neti% !oar & 3o5i% !oar ill !e ea resltin5 in non aaila!ilit"

of all D ries & a%' !rea8er

< $"ro5en ill start es%apin5 fro' 5enerator in a!sen%e of seal oil

< DG set s4ol 5et starte on ato

< $OT7 ill not %lose

ACTION#

? Sit%4 off 5enerator !rea8ers fro' +B %ontrol roo'

? Ensre G as starte on ato 4an5e oer DG sor%e of E6 4ar5e E6

!" trippin5 in%o'er fro' station sppl" & %losin5 in%o'er fro' DG in%o'er !8r

? After %4ar5in5 E6 ensre t4at AOP,OP & SOP are on

? Ensre s%anner air fan in on it4 its a'per sta"pt

? Operate !arrin5 5ear 'anall"

1


11/29

? If DDB failre is %ase !" failre of !atteries to elier loa ,!atter" 'a" !e

isolate fro' DDB 6ain %4ar5er %an no !e 'ae on & DDB %an !e %4ar5e

? Sit%4-off EOP feeer in Ele%tro'a5neti% !oar 4ar5e ele%tro'a5neti% !oar

fro' alternate sor%e Sit%4 on EOP feeer

? Isolate all stea' inpt to %onenser, ensre openin5 of a%' !rea8er Open

air isolatin5 ale on startin5 ee%tor

? Sit%4-off in%o'er !rea8ers 'anall" & t4en %4an5eoer D spplies of nit &

station @7 sit%45ear & 3T sit%45ears one !" one All rie !rea8ers ill trip

on +=7

? Sit%4-off fiel !rea8ers 'anall"

? Ensre t4at FN;7,$P-3P !"pass ales are %lose

? Start AP$s fro' E6 sor%e

7. %PS AIL%RE##

CONSE$%ENCE#

< ADB A,B sppl" to FSSS,DAS,$P !"pass, +B 1,2,# ill %t off

< On +PS poer failre, Boiler 6FT ill not a%t !t all fel ill !e %t-off !"

iniial %o''ans


12/29

< Bot4 AP$ ill re'ain in seri%e it4 ele%tri% ries Also Air 'otor

solenoi ale ill e-ener5ise (ie air 'otor ill ta8e start)

< ;nnin5 BFPs ill %ontine to rn !t s%oop ill re'ain lo%8e in last

position No prote%tion ill !e aaila!le for BFP- Deareator leel lo-lo

prote%tion ill not !e aaila!le for all BFPs


13/29

< ID & FD fans to !e stoppe after rnnin5 for 1 'intes (to fa%ilitate !oiler

pr5e) Bearin5 te'peratres are to !e 'onitore lo%all" till t4en


14/29

17. 3o loa %ontrol ale of F;S Air to open Sta" pt

18. ID Fan IG7 Biire%tional Sta" Pt

19. PA a'per Biire%tional Sta" pt

20. FD fan a'per Biire%tional Sta" pt

21. All a9iliar" a'pers Air to %lose :ill open

22. $P$ nor'al rain to D=A($D-*1) Air to %lose :ill open23. $P$* alt rip to %onenser ($D-#1) Air to %lose :ill open

24. Alt rains of 3P$ 2($D-1 &1/) Air to %lose :ill open

25. D=A oerflo(6-0) Air to %lose :ill open

26. ;e%ir%lation ales of EP(6-##) Air to %lose :ill open

27. ;e%ir%lation ales of BFP Air to %lose :ill open

ACTION#

? 4e%8 IA %o'pressor & IA line (lo pr alar' %o'es at ** @5)

? De%rease r' loa 5raall" to 'aintain r' leel & t4e rate of a%' rop

? 6aintain frna%e pressre

? $otell & D=A leel %an !e 'aintaine !" operatin5 ele%tri%al !"pass ales of

t4e %orresponin5 %ontrollers

9. TOTAL PO:ER AIL%RE#

CONSE$%ENCE#

? All nits ill !e trippe

ACTION#


15/29

pressre 4an5e oer to A S%anner as soon as DG sppl" is restore Start AP$

on DG sor%e Ensre ot4er $T=3T a9iliaries are in off position


16/29

;. %NIT '%S AIL%RE#

3ist of i'portant ries %onne%te it4 ifferent istri!tion !oars & %ontrol %entreL

'MCC


17/29

? Dries fro' TG7D1&2, B7DD1&2 !ein5 %o''on t4ere ill !e no

pro!le'

CCasease1# %S


18/29

CONSE$%ENCE#

< $P=IP %ontrol ales 5o fll" open & nit loa 5oes p to 'a9

< Generator oerloain5 'a" lea to inin5 te'p in%rease

< Frna%e pressre 'a" 5o 4i54 leain5 to ID fans oerloain5

< All tr!o-sperisor" para'eter ini%ations asso%iate it4 t4e

TSI ill !e lost in%lin5 i!ration e9pansion, s4aft position &

ine%tion ater ale position

ACTION#

? Start re%in5 t4e startin5 ei%e till t4e loa %o'es !a%8 to esire

ale

? ;e%e speeer 5ear till a frt4er e%rease in loa is o!sere &

raise t4e startin5 ei%e

? As t4e spee referen%es set points & loa =%ontrol loa 5raient

%ontrol on=off ini%ation 5o off %lose t4e isolatin5 ales on se%onar"

oil lines fro' E$

? 6aintain nit loa, 'ill firin5, frna%e raft, r' leel, stea'

para'eters

? If %ontrol sppl" failre is e to eart4 falt or !lon fse JE$

%ontrol falt 'a" %o'e & i''eiatel" %4e%8 t4e %ir%it

?? Get t4e fse of poer sppl" to TSI %a!inet repla%e & 'ean4ile

ont %4an5e an" para'eter TSI poer sppl" failre alar' %o'es in

+B

11. 'P MASTER SPEED CONTROLLER AILS HIGH#

10


19/29

CONSE$%ENCE#

< Dr' leel ill start in%reasin5 if BFP %ontroller 5oes to'a9i''

< T4e 4i54 ran5e fee %ontrol ale ill start %losin5 in response of

4i54 fee ater flo & r' leel if DP ini%ator a%ross F: %ontrol

ale 5oes to Hero

< BFP 'a" trip on a%%ont of 4i54 fee ater flo ('ore t4an #

T=4r for 'ore t4an a 'inte)

< Dr' leel 4i54 alar' %o'es at 12*'' & nit trip o%%rs if leel

rea%4es 22*'' & re'ains 'ore t4an 1 se%

< BFP flo 4i54 alar' 'a" %o'e

ACTION#

? I''eiatel" transfer t4e BFP 'aster %ontroller to 'anal 'oe

? I''eiatel" re%e t4e iniial spee %ontrollers otpt to

!rin5 on t4e ater flo if neee

? :at%4 t4e r' leel & ensre it is 'aintaine nor'al

1&. STATION SO%RCE TO %NIT EMCC AILS#

T4e ries %onne%te fro' nit E6 are as folloL

1. Incomer from station service switchgear

2. Incomer from diesel generator switchgear

3. Auxiliary oil pump-2

1/


20/29

4. Jacing oil pump-2

!. "tator water pump-2

#. $%&I'A( )attery charger *+2#, -2#,

/. 0ain )attery charger *22,

. "witchyard main )attery charger-2

. 5" inverter *alternate source

1. %mergency supply to A56 motor

11. A7 seal oil pump

12. A7 scanner air fan

CONSE$%ENCE#

< All t4e a!oe state ries ill !e trippe

< In nor'al rnnin5 %onition D seal oil p'p, D s%anner air fan, resere

stator ater p'p (If S:P-2 as in seri%e) ill ta8e start

< @E3T;ON !atter" %4ar5er (M2 & -27) & Stan!" !atter" %4ar5er (227)

ill ta8e loa

< DG set ill ta8e start

ACTION#

? Open t4e station seri%e !rea8er to 1*7 E6 & %lose t4e DG !rea8er to

E6 E6 ill !e %4ar5e fro' DG set

? All preiosl" rnnin5 ries ill a5ain start e9%ept DEBI@AK %4ar5er Start

DEBI@AK %4ar5er & %lose all t4ose D ries

? 6ean4ile tr" to %4ar5e E6 fro' station seri%e

1(. IG) O ONE ID AN GOT DELIN>ED##

2


21/29

CONSE$%ENCE#

< Frna%e 'a" !e pressriHe 4eail"

< Ot4er rnnin5 ID fan 'a" trip on oerloa

< Frna%e pressre 4i-4i alar' ill %o'e

< +nit 'a" trip on 4i54 frna%e pressre (M1* ''%l)

ACTION#

? As soon as lo a'pere in t4e ini%ator is noti%e, release t4e ot4er

ID fan to 'anal & pt it in fll loa? ;e%e t4e Blae pit%4 %ontrol of t4e FD fan %orresponin5 to t4e

affe%te ID fan

? I''eiatel" %t in oil in sita!le eleation

? t off to 'ills fro' top

? +nit loa %o'es on to *>->

? @eep on at%4in5 r' leel & BFP 'asters response If reCire

'anall" re%e t4e 'aster to aoi r' leel fl%tation

? 6aintain o9"5en !eteen #>-*> in t4e fle 5ases

? lose t4e !lo%8 ale of sper 4eater & re 4eater spra" !lo%8 ale

? IG7 !ein5 e-lin8e ill %o'e on to its 'ini'' position !" its

on ei54t & ID fan a'pere ill %o'e on 4ile in +B its IG7

position ill not ini%ate its a%tal 'ini'' position

1*. EXPANSION TAN> )AC%%M DETERIORATES##

21


22/29

CONSE$%ENCE#

< Generator stator inin5 te'p 'a" rise 5raall" TG ill trip at

1* as entrappe 5ases 4a'pers 4eat transfer

< Generator inin5 'aterial 'a" %orroe

< Stator ater %on%tiit" 'a" in%rease as a%' eterioration

'a" !e e to air in5ress in t4e tan8 4i%4 ill %ase %opper lea%4in5

in stator inin5

ACTION#

? In%rease 'otie fli pressre of ee%tor

? 4an5e oer ee%tor

? 4e%8 for an" air in5ress point in e9pansion tan8

? If a%' oes not i'proe after all, %lose ee%tor 'otie fli

inlet ale & fill p t4e e9pansion tan8 it4 'a8e p fro' D6 plant

? Allo t4e non-%onensa!le 5ases to 5o ot of t4e tan8 t4ro54 t4e

s%tion pipe of ee%tor

? No stop 'a8e p & as e9pansion tan8 leel fall 5raall" a%'

ill !e %reate & pt ee%tor in seri%e

? A%tall" stator otlet ater is fe fro' top of t4e tan8 so t4at t4e

entrappe 5ases 'a" release in a%' 4ile ater rea%4es t4e top leel

of ater insie t4e tan8 & s%8e !" t4e ee%tor $en%e effort s4ol !e

'ae to 8eep t4e tan8 leel nor'al not 4i54

1+. S: LO: LO: AT HIGH COND%CTI)ITY#1+. S: LO: LO: AT HIGH COND%CTI)ITY#

22


23/29

CONSE$%ENCE#

< Generator 'a" trip at 1# '#=4r flo

< Stator & rotor inin5 te'p 'a" 5o 4i54 TG 'a" trip at 1*

< Generator 'a" trip on 5ron falt rela" prote%tion

< $2pr 'a" rop (alar' %o'es at 20 @s%) & !elo 2* @s% $2pr

J3iCi in 5enerator alar' 'a" %o'e in %ase of !ro8en 4ose

%onne%tin5 %on%tors 4eaer

< Stan!" seal oil p'p 'a" ta8e ato start on lo is%4ar5e pr

interlo%8

< Stan !" S: p'p ta8es ato start at a pr of 2# @s%

< Inter trn falt 'a" o%%r in stator inin5

ACTION#

? Open t4e !"pass ale of D6 'a8e p ale to e9pansion tan8

? I''eiatel" re%e loa 8eepin5 it4 $2pr folloin5 5enerator

%apa!ilit" %re to 8eep inin5 te'p it4in 0* $2pr ill fall in

%ase of !ro8en 4ose %onne%tin5 %on%tor 4eaer

? ;e%e e9%itation 8eepin5 it4 t4e loa

? losel" 'onitor $2prit" & its 'oistre %ontent

?Sit%4 oer S: filter as its %lo55in5 'a" re%e flo

? ;e5enerate SP+ (stator polis4in5 nit) to i'proe %on%tiit"

? 4an5e oer S: %ooler to i'proe %on%tiit" sspe%tin5 %ooler

'aterial %orrosion

? Instr%t lo%al operator to %4ar5e 'ore $2 %"liner to 'aintain pr

2#


24/29

17. SEAL OIL RET%RN LINE NEAR PRECHAM'ER

DE)ELOPS LEA>AGE#

CONSE$%ENCE#

< Seal oil pr lo alar' %o'es at # @s% & resere seal oil p'p

%o'es on interlo%8

< Seal oil !a!!it liners 'a" !e a'a5e In%rease %learan%es lea to

'ore seal oil rain $2 'a" lea8 ot of t4e s"ste'

< TG 'a" trip e to 4i54 rotor inin5 te'p at 1* at lo $2pr

< Seal oil DP 5oes lo (alar' at / @s%)

< DP;7 B 'a" %o'e in seri%e to sppl" 5oernin5 oil

< SOT leel ill 5o on

< 6OT leel ill start fallin5

ACTION#

? It ill !e iffi%lt to ete%t an oil lea8a5e near pre%4a'!erIf

ete%te Ci%8l" %la'p it to arrest lea8a5e to 'a9i'' e9tent

possi!le

? 6aintain 5enerator loa folloin5 5enerator %apa!ilit" %re it4

fallin5 $2pr

? Instr%t lo%al operator to %4ar5e 'ore $2 %"liner to 'aintain pr

? Ensre rotor & inin5 te'p are it4in li'its

?If DP;7 is fon to 'alfn%tion 5et it !"passe lo%all"

? 6OT oil top-p s4ol !e one to %o'!at 'inor lea8a5e for s4ort

perio

? +ner e9tre'e %onitions 5enerator 'a" 4ae to !e trippe

'anall" e to so'e e'er5en%"

? 4an5e oer filters to 5et !etter perfor'an%e

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18. ATRS AIL%RE

%NCTIONAL DISTRI'%TIONAL O ATRS PANELS#

1) All SG an S3 in%lin5 3o5i% ir%it for prote%tion = Interlo%8s

2) 3i'it 7ale 6onitors for Prote%tion =Interlo%8s

#) Dries (P'ps, ales, et%)

) 3i'it 7ale 6onitors for SG (Tr!ine) %riteria an Binar" si5nals

*) Annn%iation ;ela"s an Ato S"n%4roniHer

) TSE (Tr!ine Stress Ealator)

.) E$ (Ele%tro $"rali% ontroller)

0) 3PBP an Glan Stea' ontroller

/) Tr!oisories ( E9pansions, A9ial S4ift, 7i!rations)

1) Analo5 Si5nal onitionin5

11) 3oa trans%ers an 3oa S4ein5 ;ela"

12) ;ela"s for Tr!ine Prote%tion

1#) Binar" si5nals for Trippin5 an ATT pro5ra''es

1) ;ela"s for ATT ries

PO:ER S%PPLY SYSTEML

All AT;S panels 5et parallel poer sppl" fro' folloin5 to s"ste's

1) M 27 @E3T;ON Panel of 1A ratin5 for M2 & **A ratin5 for 27 (it4 its

27 A inpt sppl" fro' +PS), t4ro54 !rea8ers of ifferent ratin5s

@E3T;ON panel 4as no !atter" !a%8 p

2) M 27 DDB (t4ro54 Fses of ifferent ratin5s), fe fro' M 27 DEBI@AK

4ar5er it4 !atter" !a%8 p(#A$ ratin5) & -27 DEBI@AK 4ar5er it4 !atter"

!a%8p(12A$ ratin5 )

Ea%4 of t4e a!oe t4e sppl" s"ste's nor'all" s4ares *> loa an is %apa!le of

elierin5 fll loa rin5 trippin5 =ota5e of t4e ot4er Drin5 trippin5 of Inpt !rea8er

2*


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of @E3T;ON panel, !ot4 of its M27 an 27 otpt sppl" ill fail Si'ltaneos

!loin5 of fse in an" Feeer of M 27 DDB ill %ase partial poer failre in

respe%tie AT;S panel $oeer, an" eental %as%ae trippin5 of !ot4 @E3T;ON

AND DEBI@AK %4ar5er an ina!ilit" of !atter" to fee t4e reCire sppl", ill lea to

failre of %o'plete poer sppl" to all t4e AT;S Panels

CONSE$%ENCE#

< All stats la'p ini%ations in t4e AT;S %onsoles ( nos in%lin5 ATT %onsole)

ill 5o off No on=off stats of AT;S ries (P'ps an 7ales) ill !e aaila!le

< All Analo5 ini%ations li8e ale position fee!a%8s, %o''ans, set points,

eiations, et% ill !e%o'e Hero in t4e AT;S %onsoles Onl" A''eter ini%ations

for AOP1&2 an EP1&2 ill re'ain aaila!le, as t4e sa'e are poere t4ro54

AS (Analo5 ontrol S"ste')

< TSE ini%ator alon5 it4 loa=spee ini%ation ill !e ot of seri%e Spee

ini%ation in i5ital ini%ator ill also not !e aaila!le as t4e spee si5nal is fe

t4ro54 AT;S panel $oeer, loa ini%ation ill re'ain aaila!le in 6: 'eter

< Ini%ators an re%orers for tr!ine para'eters li8e e9pansions an i!rations,

'etal & !earin5 te'peratres, %ontrol ales positions, TSE 'ar5ins, 3! oil &

a%8in5 oil pressre, in%lin5 $P$ *& leel ini%ation ill !e ot of seri%e

< Ini%ators for tr!ine trip oil pressre (an startp oil pressre), a9 se% oil

pressre, $P & IP se% oil pressre an %onenser a%' ill re'ain aaila!le

(si5nale t4ro54 AS)

< Ini%ators an re%orers for 5enerator para'eters li8e Stator ater flo,

te'peratre an %on%tiit", seal oil an 4"ro5en pressre, seal oil te'peratre,

seal oil to 4"ro5en DP, 4"ro5en prit", 5enerator stator slot & %ore iron

te'peratre, %ol & 4ot 5as te'peratre ill re'ain aaila!le, as t4e sa'e are not

poere t4ro54 AT;S

< In a!sen%e of AT;S poer sppl", 6= ill re'ain on Bar Tr!ine ill not trip

e to an" Ele%tri%al Prote%tion, een if Generator or Boiler trips, as Tr!ine trip

solenois are reCire to !e ener5iHe to rain t4e trip oil De to t4e sa'e reason,

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re'ote tr!ine trippin5 fro' +B is not possi!le $oeer, $"rali% oer spee

trip, a%' trip an a9ial s4ift trip ill re'ain aaila!le Also, 6= %an !e 'anall"

trippe fro' Tr!ine Goernin5 ;a%8

< E$ (Ele%tro $"rali% ontroller) otpt ill !e%o'e Hero, !t Pln5er oil

ill !e%o'e off an 4en%e 6= ill ato'ati%all" %4an5eoer to 4"rali% 'oe,

it4 startin5 ei%e in its last position $oeer, loa re%tion, if esire, is

possi!le fro' 5oernin5 ra%8 onl", as re'ote operation of startin5 ei%e an speeer

5ear ill not !e possi!le

< No AT;S ries (P'ps an 7ales) in%lin5 AOP & OP %an !e operate fro'

re'ote (+B es8), e9%ept EOP

< No prote%tion = interlo%8s ill !e aaila!le for t4e AT;S ries, e9%ept EOP

4i%4 ill ta8e Ato start (on l! oil pressre lo) ire%tl" t4ro54 pressre sit%4

< All AT;S ries ill re'ain in t4eir last stats, e9%ept t4e folloin5L-

a) Tri' ei%e ill !e a%tate as its solenoi ill 5et e-ener5iHe an

4en%e IP %ontrol ales 'a" 5et t4rottle in %ase of 6= rnnin5 it4

partial loa

!) Glan stea' %ontroller otpt ill !e%o'e Hero, !t %ontrol ales ill

sta" pt an 'a" rift it4 ti'e

%) $P $eaters leel si5nal ( Fro' AT;S) ill !e%o'e Hero, T4e +B

'onte leel %ontroller ( +PS poere ) ill in%rease t4e a%tal leel

an 4en%e $P $eaters ill 5et !"passe t4ro54 4i 4i leel sit%4

) 3P B"pass ontroller otpt ill !e%o'e Hero an 4en%e B"pass %ontrol

ales (alon5 it4 stop ales an ater ine%tion ales) ill 5et %lose,

if t4e sa'e ere in open %onition $oeer, sa'e %an !e operate fro'

3PBP ;a%8

2.


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ACTION OR SAE SH%TDO:N#

? 4e%8 @E3T;ON Panel, DEBI@AK 4ar5er an AT;S Panels to ensre total

poer sppl" failre

? In ie of 6= rnnin5 in 4"rali% 'oe, isolate E$ fro' 5oernin5 ra%8 an

also ast startin5 ei%e position fro' t4e ra%8, if ne%essar"

? ;e%e !oiler firin5 to 'ini'' to !rin5 on r' pressre (an loa)

? Ensre sppl" to nit !ses fro' station sor%e !efore tr!ine trippin5

? Start EOP fro' +B an t4en AOP fro' lo%al in trial 'oe Also ensre is%4ar5e

pressre fro' lo%al T4en, EOP 'a" !e stoppe to aoi %4rnin5 effe%t an se%on

AOP 'a" !e starte fro' lo%al in trial 'oe, if felt ne%essar"

? Open 3PBP ales fro' 3PBP ;a%8 an t4en open $PBP ales fro' +B,

8eepin5 at%4 on ;e-4eater pressre

? Trip t4e tr!ine 'anall" fro' 5oernin5 ra%8 Si'ltaneosl", open 5enerator

!rea8er an i''eiatel" open t4e fiel !rea8er

? Start OP fro' lo%al in trial 'oe an ensre is%4ar5e pressre fro' lo%al

? Open Barrin5 Gear 7ale 'anall" fro' lo%al an ensre 6= on Barrin5 Gear

? Si'ltaneosl", ensre %losin5 of lea8 stea' ale an openin5 of seal stea' ale

fro' lo%al to sstain %onenser a%' Ee%tor stea' pressre %ontroller pne'ati%

ill 'aintain t4e nor'al set pressre

? As loss of ;$ prote%tion ill not !e aaila!le, !oiler is to !e trippe 'anall" if

openin5 of eit4er or !ot4 of $P an 3P B"pass ales %ol not !e ensre e to

%onenser a%' prote%tion or lo ine%tion ater pressre, as se%on EP ill not

ta8e ato start on lo is%4ar5e 4eaer pressre

RECOMMENDATIONSL

For earl" ete%tion of t4e alar'in5 sitation an fle9i!ilit" in operation for safe

s4ton, folloin5 fa%ilities 'a" !e in%orporate in t4e s"ste' L

20


29/29

? Aio=7isal Annn%iation s4ol !e proie for trippin5 of M27

@E3T;ON Panel Trippin5 of %4ar5er is alrea" annn%iate

? Annn%iation s4ol !e proie for iniial Fse failre in M 27 DDB

? Batter" olta5e lo Annn%iation it4 sita!le set point s4ol !e proie

? Proision is to !e 'ae for ire%t startin5 of AOP an OP fro' +B, alon5

it4 on=off ini%ation la'ps

? 3! oil an a%8in5 oil pressre ini%ations s4ol !e proie fro' s"ste'

(Ot4er t4an AT;S) li8e AS

? Isolation ale for lea8 stea' %ontrol ale an also !"pass ale for seal stea'

%ontrol ale are to !e proie

? Proision is to !e 'ae to ensre tr!ine trip to 5enerator trip rin5 poer

sppl" failre

emergency handling

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