Protections and Interlocks for 210 MW LMW Turbines

7/26/2019 Protections and Interlocks for 210 MW LMW Turbines

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Circuit of vacuum protection:

2

AR5A

TLR-D

To trip the

turbine

AR 7

VacuumLow low

ANN.

VACUUM PROTECTION

AR6

&

VacuumProt.out

ANN.

!

Prot. "#

in

te$t

%n

&

&

nit

"'n.

Vacuumlow

(6)* mm

AR +

AR),

Vacuum not low AR+ D/%r

"V0V open AR1)A D/

%r

""V open AR1 D/

Vacuum low

ANN.

Vacuumlow low

()+* mm

AR 7

AR)3

AR)A

De ener4i$e5

!i4 1/



< (i) 2* =

PS + 2 Vac! "er# $o% pressre s%itch,its contact )et c$oses %hen "ac! drops to 2 68 !! o( 5).PS * 2 Vac! $o% pressre s%itch, its contact )et c$oses %hen "ac! drops to 2 36 !! o( 5).AR >? 2 this re$a# )et ener)i@ed %hen "ac! drops to 2 68 !! o( 5) thro)h PS + contact < deri"ed #

* / > $o)ic in OP1R pane$ =.AR 8 7 this re$a# )et ener)i@ed %hen "ac! drops to 2 36 !! o( 5) thro)h PS *. 9Vac! $o%: %i$$ e annnciated thro)h this re$a#.AR 6B & 6C 2 "ac! protection read# circit.AR 3 7 "ac! "er# $o% protection re$a#, %hich %i$$ )et ener)i@ed thro)h the contacts o( AR >? & AR 6C

re$a#s. Be(ore "ac! p$$in) the re$a#s AR >? & AR 8 are in ener)i@ed condition ecase there is no "ac!in the condenser. AR 6A, 6B & 6C are in de ener)i@ed condition. -hi$e "ac! p$$in)< the "ac! is raisin)(ro! at!ospheric pressre to 7 36 !! o( 5) = re$a#s AR >? and AR 8 )et de e)ner)ised. Theannnciations 9Vac!! $o% 9 and 9 Vac!! protection ot 9 %i$$ )et reset.-hi$e the nit is in trippedcondition and there is n "ac! in the condenser 9 Vac! "er# $o%: %i$$ not e annnciated .Theannnciation (or "ac! protection ot is deri"ed (ro! one o( the contact o( "ac! protection ot s%itch , %hich is in para$$e$ %ith the N/C contact o( AR 6A.5ence 9 "ac! protection ot 9 %i$$ e annnciated tho)hthe protection ot s%itch is in ON condition.

-hen AR 8 )et deener)ises and thro)h its N/C contact AR 6A & AR 6B )et ener)ise. AR 6B is ati!er re$a# VTT ++ < de$a#ed pic0 p = its contact c$oses a(ter a preset ti!e. In or case it is set at * secondsand hence , the contact o( AR6B )et c$oses a(ter a ti!e de$a# o( * seconds. Thro)h the contact o( AR6B the

re$a# AR 6C )et ener)ise.AR 6C is a ti!er re$a# VTT+* < de$a#ed drop ot = its contacts c$oses i!!ediate$#a(ter the spp$# e'tended to the re$a# and a(ter spp$# ct ot its contact opens a(ter a pre set ti!e de$a#. Inor case it is set at * seconds.

In the circit <(i) *=AR>+ is a N/C contact o( AR>+ re$a# %hich c$oses %hen MSSV is in opencondition and AR +6 A is the N/C contact o( AR +6 A %hich c$oses %hen ESV & IV are in open condition.These are para$$e$ contacts .Once the ro$$in) is started contact AR+6A %i$$ )et c$oses and e(ores#nchroni@ation contact AR >+ %i$$ )et c$oses < a(ter openin) o( MSSV=.

Prot -out

$w.

Reset

nit "'n.

AR)3

AR+ AR1 AR1)A

AR),

AR)3

AR7

AR6AR)3AR),AR)AAR+AR7

P"1 P"2

AR 6

AR7

22* D3



-hi$e nit is rnnin) the re$a#s AR6A, AR 6B & AR 6C %i$$ e in ener)i@ed condition. On ener)isationthe ($a) %i$$ e in (a$$en condition inAR6A & AR6B t in AR 6C the ($a) %i$$ e in reset condition.

< (i) 2 > =

I( the protection s%itch is in ON condition and the c$osin) o( N/O contacts o( AR 3 $eads toener)isation o( TR 1 < Trine oc0ot Re$a# = and thro)h its contacts TTS < Trine Trip So$enoid = %i$$)et ener)i@ed to trip the trine.

I( the protection s%itch is in test position 9 Vac! Protection Ot: %i$$ e annnciated .I( the AR 6A isin deener)ised condition a$so thro)h its N/C 9 Vac! Protection Ot: %i$$ e annnciated.

Thro)h the N/O contacts o( AR 3 & AR ? , 9 Vac! "er# $o%: %i$$ e annnciated. AR? is a !ana$resettin) re$a#, its ($a) and contacts ha"e to e reset !ana$$#.

“ Reset before cuttin in of !acuum protection"

+

22* D3

AR 1)A

AR7AR6

Vac.Prot.%ut

Annunciation.

AR )A

Prot.out

"w.

TLR D

o

To ener4i$e

TT"

AR 6AR 6

oo

Vac.Ver'.Low

Annunciation.

AR 7

AR 6AR 6

o

+8 Ann. $uppl'



< (i) 2 8 =

;or an i$$stration .eep the protection s%itch is in test position. AR +6A and AR 6C contacts are inc$osed condition<ESV & IV are in open= .Reset s%itch is nor!a$$# c$osed t#pe, %hi$e resettin) on$# it )ets

open.No% the "ac! is droppin) to 2 68 !! 5). AR >? %i$$ )et ener)ise and its N/O contact )et c$osed,as the AR 6C contact is a$read# in c$osed condition AR3 %i$$ ener)ise and the N/O contacts o( AR 3 )etc$osed t the TR 1 %i$$ not e ener)i@ed and the trine %i$$ not e tripped. A(ter !a0in) correcti"e actions the "ac! is raised to its nor!a$ "a$e or !ore than 2 68!! AR >?)et deener)ised , t de to se$( cei$in) created # the N/O contact o( AR 3 in series %ith reset s%itch the AR3 %i$$ re!ain in ener)i@ed condition and hence the contacts o( AR 3 in series %ith protection ot s%itch are inc$osed condition. In this condition i( %e ct in the "ac! protection the nit %i$$ trip tho)h the "ac! is innor!a$ "ae. I( %e reset, the AR 3 )et deener)ised< de to the re$easin) o( se$( sea$in)= and s%itch on the protections%itch, the nit %i$$ not trip. 5ence a$%a#s re!e!er to reset e(ore ct in the protection s%itch. Thisprocedre has to e (o$$o%ed (or oi$ and A'ia$ shi(t protections a$so.

Causes for vacuum droppin:

• Redced )$and stea! pressre.

• ;ai$re o( eectors de to $o% PR1S stea! pressre.

• Ver# hi)h 5ot %e$$ $e"e$.

• ;ai$re o( coo$in) %ater p!ps.

• 1rains in "ac! s#ste! open to at!osphere & condenser< AS > &8=.

• In)ress o( air to to "ac! s#ste! (ro! $oose ($an)es and instr!ent tappin) points.

• ;ai$re o( DC + eector.

• ;ai$re o( DC + eector.

• ;ai$re o( siphon to condenser.

• ;ai$re o( )$and sea$in) %aterto "a$"es %ith sea$in) arran)e!ents.

• Inadeate condensate ($o% thro)h DC + and !ain eectors.

• Openin) o( "ac! rea0er.

)

TLR D

AR 6

AR7

Reset

Prot -out

$w.

AR6

AR )3

To ener4i$e

TT"

o

Prot -out $w.



• ;ai$re o( siphon to at!osphere o( DC +.

2.#$R%&'( %()R&'* L$% +&L PR+#(C#&+'.

• Nor!a$$# $rication to the trine earin)s is pro"ided %ith $ oi$ pressre o( + )/c!*

and

te!peratre o( 8 C .

• -hi$e the trine is rnnin) !ore than *44 rp! ,Main oi$ p!p cop$ed %ith the trine

sha(t is spp$#in) the oi$ to the earin)s %ith reired pressre o( + )/c!*.

• -hi$e set is on Barrin) )ear AC $ oi$ p!p is spp$#in) the $ oi$ %ith reired pressre.

• 1rin) start p < ro$$in) =Startin) oi$ p!p %i$$ spp$# the oi$ < i.e., p to *44 rp!=

• Trnin) the trine %ithot $ oi$ %i$$ da!a)e the %hite !eta$ coatin) in the earin)s and

sseent$# da!a)in) the trine sha(t.

• oi$ protection is desi)ned sch that i( $ oi$ pressre is (a$$in) $ess than .3 sc the

ACOP %i$$ co!e in to ser"ice on ato and $ oi$ pressre %i$$ e !aintained..

• I( ACOP (ai$s to start or the p!p is not de"e$opin) the adeate pressre, the e!er)enc#

oi$ p!p < 1COP = %i$$ co!e on ato at the pressre o( .6 sc.

• I( $ oi$ pressre droppin) to .> sc, trippin) %i$$ e initiated to the trine si!$taneos$#

a co!!and %i$$ e )i"en to open the "ac! rea0er to rin) the trine to rest ic0$# (or

a"oidin) da!a)e to the earin)s.

• I( the set is on arrin) )ear, co!!and %i$$ e initiated to trip the arrin) )ear !otor.

• To aoi5 !rea9i$h trippin4 two out o! three lo4ic i$ a5opte5 !or lub oil pre$$ure er'

low trippin4.

6

%R

&

AR27Lub oil prot..rela'



7

To trip the

turbine

%n

ener4

i$e5

Deener4i$e5

Lub oil Pr.LowANN.

Lub. %il

Pr. Low

( *.6 :$c

AR 8

A.3.L%P

"TART

Lub. %il

Pr. Low

( *.) :$c

D.3. L%P

"TART

Lub. %il

Pr. V.Low

( *. :$c

"V&V

%pen

AR1)A D/

,; otor

%N

AR28

AR<A

AR1*

!

Prot.$winAR<,

! AR+7

Lub oil

Pro.out

ANN.

te$t

&

Lub oil

Pr..low

ANN.

&

&

TLR-D

%pen

Vacuum

,9r.

"top,;mo

nit$

'

LUB OIL PROTECTION

!i4 ) /



UB OI PROTECTION REA1 CIRCUIT

< (i) 2 3 =

PS 2 oi$ pressre s%itch in OP1R pane$ , %hich %i$$ act at .3 sc.

AR 4 , oi$ pressre $o% re$a# , thro)h this 9 oi$ pressre $o%: %i$$ e annnciated and thro)h itscontact ACOP %i$$ )et started at .3 sc.

F6 2Contact pens in case o( po%er spp$# (ai$re to earin) )ear !otor and re!ain c$osed so $on) as po%erspp$# is a"ai$a$e.F3 2 Contact c$oses at the !o!ent o( initiatin) arrin) )ear !otor start p and sha$$ open in the e"ent o(nor!a$ stoppin) o( !otor or stoppin) o( !otor # inter$oc0.F? 2 contact c$oses on ener)i@in) o( arrin) )ear contactor and opens in the e"ent o( nor!a$ stoppin) o(!otor or ato stop.

PS+ 2 oi$ pressre s%itch contact, %hich %i$$ c$ose at .3 sc pressre.

AR 4 2 oi$ pressre $o% re$a#, thro)h %hich 9 oi$ Pressre o% 9 %i$$ e annnciated and ACOP %i$$e started.

AR *? 2 oi$ protection re$a# , oi$ pressre "er# $o% %i$$ e co!!nicated thro)h its contact (ro! $oi$ pressre "er# $o% pressre s%itch to AR GA and AR GB re$a#s. %hi$e the TD is on arrin) )ear AR *? )etsener)i@ed thro)h F6 & F3 contacts %ith a se$( sea$in) o( AR *4 & AR *? contacts. Once the ESV & IV s areopened this %i$$ ener)i@ed thro)h the contact o( AR+6 A. I( the AR*? is not ener)i@ed , oi$ protection

8

AR28

=)

=7

=6

AR28

AR27

AR1)A

P"1 P"1

AR27AR 8

22* V D3



!a# not act and hence oi$ protection ot %i$$ e annnciated thro)h the N/C contact o( AR *? as sho%ne$o%.

AR *4 2 This is a de$a#ed o(( ti!er re$a#.< VTT +* = This re$a# %i$$ )et ener)i@ed %hen the Barrin) )ear !otoris in ser"ice. oi$ protection is ena$ed thro)h the contacts o( AR *? & AR *4 %hi$e the TD is on Barrin)

)ear.

Lub oil protection trip circuit:

< (i) 2 ? =

PS * 2 $ oi$ pressre s%itch < .> 0sc= contact, arri"ed # * / > $o)ic (ro! OP1R pane$.AR GA & GB 2 $ oi$ protection "er# $o%, re$a#s.AR + 2 oi$ pressre "er# $o% annnciation re$a#< !ana$ contact and ($a) resettin)=

AR 8? 2 oi$ protection ot re$a#, I( the protection s%itch is in test position ,AR 8? %i$$ )et ener)[email protected] S%itch 2 Nor!a$$# c$osed 2 %hen the s%itch is trned , the contact )ets open.

Reset this s%itch e(ore cttin) in the $ oi$ protection as said (or "ac! protection.

<

te$t te$ton te$t

nit$'nchroni$e5

Re$et "#

+8VAnn."uppl'.

AR 27

AR +7AR 1*AR <,

P" 2

AR 27

AR <A

22* V D3

AR <A

Prot."#

Lub iol prot. %ut

Annunciation



#urbine trip for lub oil protection:

< (i) 2 4 =

AR GA & AR GB 7 N/O contacts o( AR GA and AR GB re$a#s respecti"e$#.AR 8? 2 N/ C contacts o( AR 8? re$a#AR 4 2 N/O contact o( AR 4 re$a#.It c$oses to start the ACOP !otor in the e"ent o( $ oi$ pressre drops to

.3 0sc.

CA 3 2 "ac! rea0er 2 AC operated !otori@ed "a$"e,it )ets opened (or $ oi$ and a'ia$ shi(t protections to rin) the TD rotor to the rest position as ic0 as possi$e.

Trippin) o( trine (or $ oi$ pressre "er# $o% protection.

The protection is in 9ON: condition, N/C contacts o( AR 8? in c$osed condition. -hen the $ oi$ pressredrops to .> 0sc AR GA and AR GB )et ener)i@ed. The c$osre o( N/O contact o( AR GA in series %ith contactAR 8? < (i)74= $eads to ener)isation o( TR 1 to trip the trine.The c$osre o( N/O contact o( AR GB in series %ith contact AR 8? < (i)74= $eads to open the "ac! rea0er.

I( the TD is on Barrin) )ear and the $ oi$ pressre drops to .> 0sc , # the openin) o( AR GB N/C contact

the arrin) )ear !otor %i$$ trip.I( the protection is in 9ot: condition , Barrin) )ear !otor %i$ not e tripped asthe para$$e$ contact AR 8? N/O %i$$ )et c$osed %hi$e the protection is ot.;or oth the cases the "ac! rea0er )ets opened.Thro)h the contacts o( AR 4 ACOP )ets started at .3 sc o( $ oi$ pressre.At .6 0sc the 1COP )et started direct$# thro)h the $oca$ pressre s%itch. There is no re$a# (or 1COP.

L$% +&L )''$'C&)#&+'

1*

22* D3

AR +7AR <,

N03/

AR 8

TLR D

AR +7AR +7AR +7AR +7

AR <,AR <,AR <AAR <A

3A

6contactor

11* A3 control $uppl'

To $top

,arrin4 ;ear

motor

To $tartA3L%P



< (i) 2 G=

AR4 2 thro)h this contact $ oi pressre $o% %i$$ e annnciated.AR GA & AR + 2 thro)h these para$$e$ contacts oi$ pressre $o% %i$$ e annnciated.

Reset before cuttin “in" t,e protection s-itc, refer fi /

et s ta0e an incident . Protection s%itch is in test position. AR *? contact is in c$osed condition .Reset

s%itch is nor!a$$# c$osed t#pe, %hi$e resettin) on$# it )ets open.

No% the $ oi$ pressre is droppin) to .> 0sc. 1e to the c$osre o( PS * ,AR GA and AR GB %i$$ )etener)ise. The N/O contacts o( AR GA & AR G B )et c$osed. No% de to the protection s%itch is in test positionthe AR 8? )et ener)i@ed and its series contact %ith AR GA & AR GB )et opened and hence the TR 1 %i$$ not )et ener)i@ed and the trippin) o( trine %i$$ e a"oided.

A(ter de"e$opin) the $ oi$ pressre < ao"e .> 0sc= PS* )ets opened .Bt the ARGA & GB %i$$re!ain in ener)i@ed state < se$( sea$in) # AR GA contact=. In this condition i( %e s%itch ON the protections%itch, AR 8? )et deener)ised and thro)h N/C contact o( AR8? and AR GAHs N/O contact <in c$osedcondition= the TR 1 )et ener)i@ed and the trine %i$$ trip.

Once the $ oi$ pressre is nor!a$i@ed, sho$d not (or)et to reset e(ore cttin) IN o( the protections%itch.

.)3ial s,ift protection

11

AR 8AR 1*AR <A

+8 V Annunciation $uppl'

Lub oil Pre$$ure

Low

Annunciation

Lub oil Pre$$ure er'

Low Annunciation



The A'ia$ !o"e!ent o( trine sho$d e %ithin per!issi$e $i!its. I( this $i!it e'ceeds there %i$$ e a da!a)eto the thrst earin) and in %orst case trine !a# )et da!a)ed se"ere$# .In desi)n care is ta0en to 0eep thetrine nder a$anced condition # ad!ittin) the stea! ($o% in opposite directions. 1e to so!e reasonsthere is a chance o( trine sha(t )ettin) !o"ed to either )enerator side <positi"e= or to%ards (ront pedesta$

<ne)ati"e=I( trine sha(t a'ia$$# !o"es # +.?!! ne)ati"e or +.*!! positi"e ,the trine has to e tripped

i!!ediate$#.Vac! rea0er has to e opened to rin) the trine to rest as ic0 as possi$e as said (or$e oi$ protection.

This protection can a$so e tested %hi$e trine is in ser"ice # 0eepin) the protection s%itch in testposition.

The $o)ics sed (or a'ia$ shi(t protection is sho%n e$o%.

>i4 - 1*

)3ial s,ift protection circuit

12

22* D3

AR-2

A?ial

$hi!t

@

te$t

nit

"'n.

A?ial

"hi!tProt. out

!

AR+6

&

&

AR-

A?ial

"hi!t

@i.@i

D

TLR-D

Vacuum ,9r.

%pen

!

Prot."#

in

AXIAL SHIFT PROTECTION



;i) 7 ++

"e 5i)h +.* !! & 7"e 5i)h +.? !! contacts (ro! tro sper"isor# pane$.AR * 7 A'ia$ shi(t protection re$a#< (r trippin) & openin) the "ac! rea0er=AR > 2 A'ia$ shi(t Annnciation re$a# < Mana$ resettin) re$a# =AR 83 2 A'ia$ Shi(t protection ot re$a#.Unit s#nchroni@ed contact ta0en (ro! 43 T , trine $oc0ot re$a# (ro! DRP.<1iode connected in series %ith AR> is co!!on (or AR ? & AR +=

#urbine Lock out Rela4s

1

A?ial "hi!t @i4h

Annunciation

AR2 AR

Vac.,9r. 3A6

AR+6

AR2

TLR D

AR2AR2

AR+6AR+6

nit

$'nchroni$e5

Prot. %ut

Annunciation

e @i

1.2mm

-e @i

1.7mm

on

Protection out $witch

on te$t

AR 2 AR +6AR

te$t AR

AR 2

Re$et "#

te$t on

+8V Annunciation

$uppl'

>i4 - 12

22*V D3 11*V A3 +8 Ann.."uppl'

22*V D3 $uppl'



( fg-13)

TR 1 2 Trine oc0 ot re$a# 91:.;(or an# protection , either (ro! e'terna$ or interna$ this %i$$ )et ener)i@ed(irst.Thro)h this re$a# contacts TR 9A: , TR 9B: & TR 9C: )et ener)[email protected] Trine trip so$enoid

%i$$ a$so )et Ener)i@ed thro)h TR 91: contacts.

C+'#R+L R(L)5 C&RC$&# CR 1 6 CR 2 :

< (i)7 +8 =

CR +, CR * 2 contro$ re$a#s < %ipe ot re$a#s, ha"in) * coi$s, one (or set and other (or reset =AR >+ 2 MSSV c$ose re$a# .AR *G A 2 ESV / IV c$ose re$a# contact < ti!er re$a# contact 2 %hich c$oses i!!ediate$# onc$osre o( ESV/IV and opens a(ter a ti!e de$a# o( 6 seconds=.

CR1 & CR2 RELAY INTER LOCKS

1+

""V main an5 ,'

pa$$ i$olation

ale$ clo$e5 limit$witch contact$

AR1

AR 1) ,

AR 1)A

;T

,9r.clo$e5

3R 13R 2

TLR D

TLR 3TLR ,TLR A

TLR D

AR <A

AR +7Prot."#

AR 6

AR +6

AR 2

TLR D

AR 2<A86T

>T

3R 2

AR1

AR2<A

;T ,rea9er opene5

& "V BV clo$e5

1), ener4i$e5/

3R 2 wipeout coil

ener4i$e5

>la4 re$et - $el!

3R 2 contact open&

""V main an5

b'pa$$ i$olation

ale$ clo$e5 AR1

ener4i$e5 / with "Van5 V clo$e5

3R 1 wipeout coil

ener4i$e5

>la4 re$et - $el!

AR >+ %i$$ ener)ise on$# a(ter +4 seconds on recei"in) o( c$osin) co!!and (or

MSSV (ro! TR . MSSV %i$$ ta0e appro'i!ate$# *.6 !intes to c$ose. 5ence CR + ($a) %i$$ )et reset on$# a(ter*.6 !intes a(ter trippin) o( trine.

A(ter openin) o( ESV & IV , AR*G A contact %i$$ open a(ter a ti!e de$a# o( 6

seconds.



< (i) 2 +6 =

(7!8&!8M77!8CR 1 6 CR 2 &'#(RL+C97.

1)

;T ,rea9er 3lo$e5

&

"V BV %pen 1)A 5eener4i$e5/

3R 2 ener4i$e5

>la4

3R 1 ener4i$e5 >la4 /

"VR/clo$e5

VR/clo$e5

VL/clo$e5

"VL/clo$e5



(7! &! interlock circuit.

16

&

""VL/

clo$e5

""VR/clo$e5

""VL/,0P-"%clo$e5

""VL/

,0P-"%

clo$e5

&AR

1

AR 2<A

ener4i$e5

&

AR 11 AR 12 AR 1+ AR 1

AR 1), AR 1)A AR 1)3 AR 2< 3

AR 2< AAR 2< ,

&

&

>

;.T.,9r

AR * A

AR *,

AR *3 %R >1)A

D

3lo$e %pen

!la4re$et3R13R2re$et !la4

+8 Annunciation $uppl' 22* D3

>i4 - 16

An' Two



AR ++ 7 ESV e(t c$ose re$a#.

AR +* 7 ESV Ri)ht c$ose re$a#.

AR +> 7 IV e(t c$ose re$a#.

AR +8 7 IV Ri)ht c$ose re$a#.

9 A$$ ESV / IV c$osed: 2 Annnciation is deri"ed # sin) the series contacts o( AR ++, AR +*, AR +> & AR

+8,I( an# one "a$"e (ai$s to c$ose this annnciation does not co!e.

9 An# ESV / IV c$osed: 2 Annnciation is deri"ed # sin) the para$$e$ contacts o( AR ++, AR +*, AR +> &

AR +8, I( an# one "a$"e c$oses ,this annnciation %i$$ appear.

< %hi$e ro$$in) oth these annnciations sho$d )et reset, so!e ti!es de to the !a$ (nction o( $i!it

s%itches in an# one o( the "a$"e 9 An# ESV / IV c$osed: annnciation !a# persists, this has to e attended to

i!!ediate$#, other%ise this !a# $ead to nit trippin) %hi$e the other $i!it s%itch c$oses # an# other reason=

(7! &! CL+7( R(L)57

17

22* V D3

Limit $witche$ o! "V & VB the$e limit $witche$ clo$e$ whileclo$ure o! the corre$pon5in4 ale$.

V R V L"V R "V L

AR 1+AR 1AR 12AR 11

AR 1+AR 1AR 12AR 11

>i4 - 17

AR 11

AR 12

AR 1

AR 1+

All "V 0 V

clo$e5 ANN.An' "V 0 Vclo$e5 ANN.



;i) 2 +4

AR++,AR +*, AR +> & AR +8 2 N / O contacts o( AR ++, +*,+> & +8

AR +6A, AR +6B & AR +6 C 2 ESV / IV c$ose re$a#s, these re$a#s )et ener)i@ed %hen an# ESV & IV c$oses

AR *G C 2 ESV / IV c$osin) contactor sed (or s%itchin) 9ON: the ti!er re$a#s AR *G A & AR *G B.

AR *G A & AR *G B 2 1e$a#ed on drop ot ti!er re$a#s < VTT +* = , %hi$e an# ESV / IV c$oses these re$a#s )et

ener)i@ed thro)h the contacts o( AR *G C and their contacts c$oses i!!ediate$# on ener)isation and opens %ith a

preset ti!e de$a# a(ter the deene)isation o( its coi$.

AR >A, AR > B & AR > C are )et ener)i@ed drin) the c$osre o( an# ESV / IV %ith the condition that the nit !st

e in s#nchroni@ed < i.e., CR + contact in c$osed condition=

AR > A & TR A, AR >B & TR B and AR > C & TR C are da$ re$a#s p$aced in the sa!e casin).

Trine tripped (eed ac0 is ta0en (ro! AR >C (or trippin) the DT rea0er on o% (or %ard and re"erse po%er

protections .C$osin) o( ESV and IV is ta0en as trine tripped (eed ac0.

#$R%&'( #R&P L+*&C7

18

1+ 1 +

1 +

1

1

1 2

3R 1

AR *

3

AR *

,

AR *

AAR 2<

A

AR 2<

,

AR 2<

3

AR 1)

3

AR 1)

,

AR 1)

A

"V &

V clo$e5

11 12 1

"V 0 V NTRL%3:



;i) 7 +G

#$R%&'( #R&P C&RC$&#

1<

>T 86 T

;RP/

Turbine

protection$

TLR CD ner4iEin4Turbine trip

$olenoi5

TLR

CA 3lo$e ""VT/

ain & ,0P ale$ >T

TLR

C,

3lo$e e?traction

ale$>3N RV/ >T

TLR

C3

&nit $'nchroni$e5

AR

*A

AR

*,

AR

*3

>T

%pen LP ,0P ale$& open

3A21&22 @PT eacuation/

Turbine trip contact !or ;RPlow

!orwar5 rela

1>D AR 1) 3

TLR C D

22* V D3

1

1..2:

AR 16

Turbine trip

solenoid

AR



;i) 2 *

Protection trippin:

;or an# protection trippin) < inc$din) e'terna$ trips= re$a# TR 1 )et ener)i@ed , thro)h its N/Ocontacts in series %ith AR+6C N/C contact < %hi$e ESV / IV in open condition= and AR +3 the TTS )etener)i@ed and trips the trine< CVSM,ESV and IV )et c$osed=.As soon as the ESV / IV c$osed the AR +6C contact )et open < TR 1 contacts re!ains in c$osedcondition=,+ M Oh! resistor and + M (d capacitor co!e in series %ith trip so$enoid and AR +3. The "o$ta)eacross the trip so$enoid dischar)ed # the + M oh! resistance.As the hi)h resistance is co!e in toseries the crrent ($o%in) thro)h the trip so$enoid and AR +3 %i$$ a$so !ini!i@ed. And hence the tripso$enoid and AR +3 coi$ )et deener)ised.The contact and (a) ha"e to e reset # !ana$.Thro)h the contact o( AR +3 9Trine protection trip: %i$$ e annnciated.

;and trip from $C% :

;or an# e!er)enc# # trnin) the trine hand trip s%itch in the contro$ des0, ** V 1c is direct$# app$ied tothe trip so$enoid in series %ith AR >> and AR +6 C contact and the trine %i$$ )et tripped.

Thro)h the contact o( AR >> 9Trine 5and trip UCB: %i$$ e annnciated.

#urbine local trip:

The trine can e tripped (ro! $oca$ # pressin) the p$n)er in the e"ent o( (ai$re o( e$ectrica$ trippin).1rin) this trippin) 9Trine $oca$ trip: %i$$ e annnciated thro)h AR >* re$a#.

TURBINE TRIPPE1 ANNUNCIATION

2*

AR * 3

AR 17A

22* D3 "uppl'

AR 16 AR AR 2 AR

AR 16

@an5 trip$witch

TLR C DAR 17 ,

Annunciation "uppl'



AR +3 2 Trine protection trip re$a#, (or ener)isation o( TTS thro)h the contacts o( TR 1 the AR +3 )etener)i@ed and thro)h its N/O contact 9Trine protection trip: %i$$ e annnciated.Resettin) the re$a# #!ana$ the annnciation %i$$ )et reset.

AR >> 2 Trine hand trip (ro! UCB. B# hand trippin) the trine (ro! UCB AR >> )et ener)i@ed and thro)hits contact 9Trine 5and trip c: %i$$ e annnciated.B# !ana$ resettin) the ($a) this annnciation %i$ )etreset. AR >* 2 This re$a# )et ener)i@ed thro)h the N/O contact o( AR > C re$a#. Pro"ided AR+3 and AR >> !ste in deener)ised condition. ;or the c$osre o( ESV / IV %ith nit s#nchroni@ed condition re$a# AR > C %i$$)et ener)i@ed.

TRIP CIRCUIT SUPERVISION J

+.* oh! resistance and AR +? B are sed (or sper"isin) the trine trip circit . -hi$e nit is inser"ice AR +?B is in ener)i@ed state. The !a'i!! "o$ta)e drop %i$$ e a"ai$a$e across the re$a# AR +? Bis arond +G4 V .-hen e"er a open circit occrred in Trine trip so$enoid or AR +6 C contact or in AR +3re$a# coi$ , AR +? B )et dener)ised and thro)h its N/C contact re$a# AR +? A )et ener)i@ed and thro)h itsN/O contact 9Trip circit (a$t#: %i$$ e annnciation .-hen the nit is in tripped condition AR +6 C )ets openand AR +? B )et e ener)i@ed and 9 Trip circit (a$t#: %i$$ e annnciated and )et reset a(ter openin) o( ESV

& IV..

$'&# PR+#(C#&+'7

CL)77 “)" #R&PP&'*.

Protections reired i!!ediate iso$ation o( Denerator / Denerator Trans(or!er / Unit A'i$iar# Trans(or!ersare )roped in t he C$ass 9A: trippin). %e can sa# as 9E!er)enc# shtdo%n:. ;or this protections trip i!p$seis instantaneos$# )i"en to the D.T. rea0er thro)h 43 D+, 43 D*& 43 D> )enerator !aster re$a#s and (or

trippin) the trine trip i!p$se is )i"en thro)h the 43 T trine !aster re$a# in DRP.

CL)77 “%" #R&PP&'*.

This t#pe o( trippin) is ca$$ed as 9 Nor!a$ Sht do%n: or non e!er)enc# trippin). Protections o( )enerator (or %hich i!!ediate e$ectrica$ iso$ation is not reired ,Trine protections and Boi$er protections are )roped into this cate)or#.Most o( the Denerator a'i$iar# protections are in c$ass 9B: trippin).

21

AR 2

Turbine protection trip

Turbine @an5 trip

3,

Turbine Local trip



L+W <+RW)R= P+W(R PR+#(C#&+'

o% (or%ard re$a# is desira$e to de$a# trippin) o( the e$ectrica$ $oad on the )enerator nti$ a(ter the stea!

has een tripped < c$osre o( ESV&IV= so that the stea! entertained in the trine is sed in spp$#in) the

e$ectrica$ po%er rather than casin) the set to o"er speed, that is the )enerator acts as a ra0e.

This (eatre is on$# pro"ided (or 9 non r)ent: trippin) < c$ass B= conditions.

The )enerator sho$d not a$$o%ed to trip nti$ the po%er ot pt o( the )enerator (a$$s e$o% a s!a$$

preset "a$e .

To pro"ide the hi)hest de)ree o( secrit# nder a$$ conditions the $o% (or%ard re$a# contacts are arran)ed to

c$ose %hen the )enerator po%er (a$$s to .6 K o( ($$ $oad < i.e., 1.2> M- = %ith the ti!e de$a# o( .6 seconds.

Actation o( $o% (or%ard protection a$on) %ith the trine trip $eads to trippin) o( the )enerator

22

3la$$ A protection$

o! the ;enerator.

86 ;1B;2& ;;RP/

3la$$ ,

protection$ o! the

;enerator.

Turbine loc9outrela' TLR CD

in turbine rela'

panel

Turbine trip

$olenoi5

To trip ;T brea9erBAT$B>iel5

brea9erB 6.6 :V

Tie chan4e oer

$tation bu$ /

Turbine protection$

,oiler

protection$

>T

To trip

,oiler

3lo$in4 o!

"V& V

&

Low !orwar5 *.) $ec

Reer$e power *.) $ec

%

R

Reer$e power ) $ec

86 T

;RP

3lo$ure o! "V & V

AR * ,/

Low !orwar5

Acte5 in ;RP

AND

Trippin4 o! ;enerator



Note J The trine sho$d not a$$o%ed to rn in stea! $ess condition (or a period !ore than

8 !intes.

R(!(R7( P+W(R PR+#(C#&+'

The prpose o( the re"erse po%er re$a# is asica$$# to pre"ent da!a)e to the trine.

I( the dri"in) tore eco!es $ess than the tota$ $osses in the )enerator < i.e., I( the )enerator rea0er not

)ettin) opened e"en a(ter trippin) o( the trine = and the trine , the )enerator starts to %or0 as a

s#nchronos co!pensator ta0in) the necessar# acti"e po%er (ro! the )rid.

Redction o( stea! ($o% redces the coo$in) e((ect on the trine $ades and o"er heatin) !a#

occr.partic$ar$# the shrn0 (itted PT $ades !a# )et $oosen .

The re"erse po%er re$a# )et actated at 7 .6K o( )enerator rated capacit# i.e., 7 1.2> M- .

The )enerator %i$$ trip %ith a ti!e de$a# o( .6 sec %ith trine trip and %ith a ti!e de$a# o( 6 seconds %ithot

trippin) o( the trine.

#$R%&'( R(L)5 P)'(L

Trine protections and tro"isor# annnciations are e!anatin) (ro! trine re$a# pane$. Varios inter $oc0s

are deri"ed (ro! this pane$ .This pane$ is pro"ided %ith ** " 1C and *8 " AC po%er spp$ies.

=uple3 2?0 ! )C po-er suppl4:

2

3lo$ure o! "V & V AR*,

Reer$e power Time 5ela' *.) $ec

Reer$e power

Time 5ela' ) $ec without turbine trip

&%R

;enerator trip

AR + AR )*

AR +2

AR +

AR +2

AR +2

AR +

AR +

A03

Normal$uppl'

A03

Re$ere

$uppl'

2+*V

A03

$uppl'



The nor!a$ AC po%er spp$# is (eedin) (ro! N/E s%itch )ear and the reser"e AC po%er spp$# is (eedin)

(ro! nit ser"ice s%itch )ear.I( the nor!a$ po%er spp$# (ai$s the reser"e spp$# %i$$ co!e in to ser"ice

ato!atica$$#.I( the nor!a$ spp$# res!es it %i$$ e read# and co!e on ato on (ai$re o( reser"e spp$#.The

a"ai$ai$it# o( reser"e spp$# can e !onitor # the re$a# AR 6.i.e., the ($a) sho$d e in (a$$en condition.

The (ai$re o( nor!a$ or reser"e spp$# %i$$ e annnciated.

;ro! the *8 V AC po%er, Spp# (or speeder )ear !otor, spp$# (or 1i((erentia$ e'pansion re$a#s,spp$# (or

Viration and speed re$a#s & spp$# (or MOT oi$ $e"e$ re$a#s are ta0en.;or MOT oi$ $e"e$ "iration re$a#s *8 V

AC po%er is ein) sed thro)h a separate *8/*8" trans(or!er.

;or speeder )ear !otor a separate *8 / ** / >3 " trans(or!er is sed.

Trine re$a# pane$ cic$e $i)htin) spp$# is ta0en (ro! *8" AC.

=uple3 220 ! =C po-er suppl4:

2+

AR ++

AR +2

AR ++

AR +)

AR ++

AR ++

AR +)

D3 Normal

$uppl'

A03

Re$ere$up

pl'

22*V

D3 $uppl'



The nor!a$ 1C po%er spp$# is (eedin) (ro! nit atter# roo! and the reser"e 1C spp$# is (eedin) (ro!

station atter# roo!.In so!e o( the nits the reser"e spp$# is a$so ta0en (ro! nit atter# roo! (ro! the

di((erent !od$e.I( the nor!a$ po%er spp$# (ai$s the reser"e spp$# %i$$ co!e in to ser"ice ato!atica$$#.I(

the nor!a$ spp$# res!es it %i$$ e read# and co!e on ato on (ai$re o( reser"e spp$#.The a"ai$ai$it# o(

reser"e spp$# can e !onitor # the re$a# AR 6+.i.e., the ($a) sho$d e in (a$$en condition.

The (ai$re o( nor!a$ or reser"e spp$# %i$$ e annnciated.

The **" 1C is sed (or a$$ the protection re$a#s and (or (ie$d contacts. I( there is no **V 1C spp$# (or

re$a# pane$ , the trine !a# not trip (or an# protection.

)RR)'*(M('#7 +< )$@&L&)R5 R(L)57:

2)

ARAR7AR2AR16AR1<ARAR+1AR+*AR1*

AR+7AR+6

AR)1AR7

AR1),AR1)A

3R2AR2TLR 30

AR*3

TLR ,0

AR*,3R1TLR A0

AR*A

AR +) AR )1AR +)

VAF3

11

VAA2

1

VAA2

1

VAA1

1

VAA2

1

VAF3

11

VAA2

1

VAA1

1VAA1

1

VAA2

1

VAA2

1VAA1

1



Re$a# ae$in) S$No.

Re$a# No. ae$

+ CR + DEN SNC5 & MSV OPEN

* AR > A / TR A AR > A / TR A

> AR > B / TR B AR > A / TR B

8 AR > C / TR C AR > C / TR C

6 AR * AFIA S5I;T

3 CR * DEN SNC5 & ESV / IV OPEN

? AR +6 A ESV / IV COSE1

4 AR +6 B ESV / IV COSE1

G AR >? VAC L 68 !! 5)

+ AR 6+ RESERVE 1C SUPP ON

++ AR 83 AFIA S5I;T PROT. TEST

+* AR 8 +K OVER SPEE1

26

AR 6+AR 6AR 62AR 61AR 6*AR 27AR 6

NVR 2AR<AR 1AR <,AR <ATR 2

VTT

11

AR)A AR11 AR12 AR1 AR1+ AR8 AR26 AR1 AR18

AR2* AR1)AAR+AR2)AR)*AR)AR2+AR22AR21

VAA1

VAA1

VAA1

VAA1

VAA1

3AA

1

VAA1

VAA1

3AA

1

VAA11

VAA11

VAA11

VAA11

VAA11

VAA11

VAA11

VAA11

VAA11

VAA11

VAA11

VAA11

VAA11

VAA11

VAA11

VAA11

VAA11

VAA11

VAA2

1VAA1VTT

12

VTT

12

VTT

12

VTT

12

VTT

12

VTT11

VAA11

VAA11

VAA11

VAA11

VA;21

VAA1

1

VAA1

1

VAA1

1

VAA1

1

VAA1

1

VAA1

1

AR2<,AR2<AAR28AR17AAR) 3AR),

VAA11



+> AR 8+ +3K OVER SPEE1

+8 AR > AFIA S5I;T PROT. OPERATE1

+6 AR +G E 5 T ENERDISE1 < not in ser"ice =

+3 AR +3 TURBINE PROTECTION TRIP

+? AR >* TUEBINE OCA TRIP

+4 AR ? VACUUM PROTECTION OPERATE1

+G AR >> TURBINE 5AN1 TRIP U C B

* AR * 5PT 1i((. E'pansion 5i

*+ AR *+ IPT 1i((. E'pansion 5i

** AR *8 OA1 IMIT < not in ser"ice=

*> AR >6 AUTO ;AST REVERSE < not in ser"ice=

*8 AR 6 RESERVE AC SUPP ON

*6 AR 8 VACUUM L 36 !! 5)

*3 AR 4 UB OI PRESSURE L .4 sc

*? AR 6A CON1ENSER VACUUM

*4 AR ++ ESV < = COSE1

*G AR +* ESV <R = COSE1

> AR +> IV < = COSE1>+ AR +8 IV < R = COSE1

>* AR >4 TD VIBRATION 5ID5

>> AR *3 MOT EVE O-

>8 AR + VAC L 68 ;IRE ON

>6 AR+4 E.5.T < not in ser"ice=

>3 AR 6 B CON1ENSER VACUUM

>? AR 6 C CON1ENSER VACUUM

>4 AR +?A TTS CIRCUIT C5EC

>G AR *4 BARRIND DEAR MOTOR ON

8 AR *G A ESV / IV COSE1

8+ AR *G B ESV / IV COSE1

8* TR * E 5 T < not in ser"ice =8> AR G A UB OI PROTECTION

88 AR G B UB OI PROTECTION

86 AR >+ MSV COSE1

83 AR >G SPEE1 / CVSM SEECTION <not in ser"ice =

8? NVR * N VOTADE REA

84 AR 3 CON1ENSER VACUUM

8G AR *? UB OI PROTECTION

6 AR ** PT 1I;;.EFP. 5ID5

6+ I 2R+ AC ON

6* I 2 R* 1C ON

ARRANDEMENT O; CONTACTORS , MCBHS AN1 TRANS;ORMERS< inside o( the re$a# pane$=

27

Re$i$tor$ !orAR)AB),B)3B

2< AB2<,B17A & TR2



)larms from rela4 panel

The (o$$o%in) a$ar!s are e!anatin) (ro! the re$a# pane$.

+. A'ia$ shi(t hi)h.

*. A'ia$ shi(t protection ot.

>. oi$ pressre $o% <.3 0sc =

8. i$ pressre "er# $o% < .> 0sc =

6. oi$ protection ot.

3. Vac! $o% < 7 36 !! =

?. Vac! "er# $o% < 768 !! =

4. Vac! "er# $o% and (ire ON.

G. Vac! protection ot.

+. An# ESV / IV c$osed.

28

22*VD32*VA3

TT"$uppl'

22*VD32*VA3

D3 Volt meter

AR 1)3

AR 2<3

AR ++

AR +)

AR A

AR +A

TLR CD

AR 17,

AR

+

AR

)

3,

2,

AR

+2

AR

+

3,$

>u$e$witche$

Plu4 point

2* 0 2+Tr.

,loc9in4

Dio5e$

";r.motor

!iel5 recti!ier

TT" $up.re$i$tor&

5i$ch.re$i$tor

";r.motor

armature

recti!ier

";r.motor armature !u$e





)@&)L 7;&<# PR+#(C#&+'

S$.No.

Re$a#No.

T#peContactResettin)

;$a) N/O N/C Ratin) Re!ar0s

+ AR * VAA *+ B; 466 ;<M= Se$( es <>,8=,<6,3=,<?,4=,<++,+*=,

<+>,+8=,<+6,+3=,<+?,+4=<+G,*=

<+,*= ** V 1C

* AR > VAA +> ; ++; Se$( es <+,*=,<>,8= <6,3=,<?,4= ** V 1C

> AR 83 VAA *+ B; 46? ;<M= Se$( es <++,+*=,<+>,+8=,<+?,+4= <+,*=,>,8=,<6,3=,<?,4=,<G,+=,<+6,+3=

** V 1C

C+'=('7(R !)C$$M PR+#(C#&+'

S$.No.

Re$a#No.



+AR 8

VAA ++ ; +G ; Se$( es <6,3=,<?,4= <+,*=,<>,8= ** V 1C

* AR >? VAA ++ ; >4 ; Se$( es <>,8= <+,*= ** V 1C

>AR 6A VAA ++ ; >4 ; Se$( es <>,8= <+,*= ** V 1C

8AR 6B

VTT ++ Se$( es <?,4=,<++,+*= <+,*=,<>,8= ** V 1C ;$a) %i$$ (a$$ in ener)i@edcondition

6 AR 6CVTT +* Se$( es <>,8=,<6,3=,<?,4= <+,*= ** V 1C ;$a) %i$$ (a$$ in

deener)i@edcondition

3 AR 3VAA ++ * D 4?6;<M=

Se$( es <>,8=,<6,3=,<?,4=,<++,+*= <+,*= ** V 1C

?AR ? VAA +> ; ++; 5and es <+,*=,<>,8= <6,3=,<?,4= ** V 1C

*



L$% +&L PR+#(C#&+'

S$.No.

Re$a# No. T#peContactResettin)


+ AR 4 VAA ++ ; +G ; Se$( es <6,3= ,<?,4= <+,*=,<>,8= ** V 1C

* AR + VAA +> ; ++ ; 5and es <+,*=,<>,8= <6,3=,<?,4= ** V 1C

>AR GA &AR GB

VAA ++ D 4?6;<M=

Se$( es <>,8=,<6,3=,<?,4= <+,*= ** V 1C

8 AR 8?VAA *+ B; 46?;<M=

Se$( es <++,+*=,<+>,+8=,<+?,+4=<+,*=,<>,8=,<6,3=,<?,4=,<G,+=,<+6,+3=

** V 1C

6 AR *?VAA ++ D 4?6;<M=

Se$( es <>,8=,<6,3=,<?,4= <+,*= ** V 1C

3 AR *4 VTT +* Se$( es <>,8=,<6,3=,<?,4= <+,*= ** C 1C;$a) %i$$ (a$$ in deener)i@edcondition

ESV , IV & MSSV INTEROCS

S$.No.

Re$a#No.



+ AR ++ VAA ++ ; +G; Se$( es <6,3=<?,4= <+,*=,<>,8= ** V 1C

* AR +* VAA ++ ; +G; Se$( es <6,3=<?,4= <+,*=,<>,8= ** V 1C

> AR +> VAA ++ ; +G; Se$( es <6,3=<?,4= <+,*=,<>,8= ** V 1C

8 AR +8 VAA ++ ; +G; Se$( es <6,3=<?,4= <+,*=,<>,8= ** V 1C

6 AR +6A VAA *+ B; 463 ;<M= Se$( es <6,3=<+,*=,<>,8=,<6,3=,<?,4=<++,+*=,<+>,+8=,<+?,+4=<+G,*=

**V 1C

3 AR +6 B VAA ++ B; *+ ; Se$( es<+,*=,<>,8=,<6,3=,<?,4=<+G,*=

<+?,+4= ** V 1C

? AR +6C > TA 3+ Se$( No <+,*=,<>,8=,<6,3=,<+>,+8= <+6,+3=,<+G,*=,<*>,*8=,<*?,*4= ** V 1C

4 AR *GC > TA 3+ Se$( No <+,*=,<>,8=,<6,3=,<+>,+8= <+6,+3=,<+G,*=,<*>,*8=,<*?,*4= ** V 1C

G AR *G A VTT +* Se$( es <>,8=,<6,3=,G?,4= <+,*= ** V 1C;$a) %i$$ (a$$ indeener)i@edcondition

1



+ AR *G A VTT +* Se$( es <>,8=,<6,3=,G?,4= <+,*= ** V 1C;$a) %i$$ (a$$ indeener)i@edcondition

++ AR >+ VAA ++ D 4* Se$( es <6,3=,<?,4=,<++,+*= <+,*=,<>,8= ** V 1C

+* CR + VAC ++ B; >>A Se$( es<+?,+4=,<+G,*=,<+,*=<>,8=,<6,3=,<?,4=

<+>,+8=,<+6,+3=** V 1C

-ipeotcontact

+> CR * VAC ++ B; >>A Se$( es<+?,+4=,<+G,*=,<+,*=<>,8=,<6,3=,<?,4=

<+>,+8=,<+6,+3=** V 1C

-ipeotcontact

TRIPPIND CIRCUIT & OCOUT REAS

S$.No.

Re$a#No.



+ AR +3CAA +> ; 4GB<M=

5and es <+,*=,<>,8= <6,3=,<?,4= + A 1C

* AR >>CAA +> ; 4GB<M=

5and es <+,*=,<>,8= <6,3=,<?,4= + A 1C

> AR >* VAA +> ; ++; 5and es <+,*=,<>,8= <6,3=,<?,4= ** V 1C

8AR >A/TR A

VAA *+ B; 46* ;<M= Se$( es* set < +,*=,<>,8=,<6,3=,<++,+*=,<+?,+4=,<+G,*=

Ni$ ** V 1C

6AR >B/TR B

VAA *+ B; 46>;<M=

Se$( es <+,*=,<>,8=,<6,3=,<++,+*=<+?,+4= (or AR >B &<+,*=,<>,8=,<6,3=,<+G,*=(or TR B

Ni$

** V 1C

3AR >C/TR C

VAA *+ B; 468;<M=

Se$(

es

<>,8=,<+>,+8=,<+?,+4=,<+G,*= (or TR C & <6,3=,<++,+*=,<+6,+3= (or AR >C

<+,*= (or TR C ** V 1C

2



BOILER ROTECTIONS

1. ,oth D >an$ trip

2. ,oth >D >an$ trip

. >lame !ailure trip+. Lo$$ o! all !uel trip

). mer4enc' trip

6. >urnace pre$$ure er' hi4h

7. >urnace pre$$ure er' low

8. Drum leel @i @i

<. Drum leel Lo. Lo.

1*. Air !low le$$ than *G

11. Reheater protection acte5

12. Lo$$ o! critical power !or more than 2 $econ5$.

!ENERATOR ROTECTIONS

. 3LA"" CA

1. ;enerator inter win5in4 protection

2. AT HAI %er current

. AT H,I %er current

+. ;enerator reer$e power

). "tator $tan5 b' earth !ault

6. %erall 5i!!erential protection

7. ;enerator oer olta4e

8. Pole $lip

<. ;enerator 5i!!erential protection

1*. ;.T. %er !lu?in4.

11. Rotor earth !ault $ta4e

12. Low !orwar5

1. AT C A 5i!!erential protection



1+. AT C , 5i!!erential protection

1). ;.T. re$tricte5 earth !ault protection

16. "tator <)G earth !ault

17. Local ,rea9er ,ac9up 0 ,u$ bar protection

18. mul$i!ier

1<. ;.T.,ucholE

2*. ;.T. pre$$ure relie!

21. ;.T. %LT3 ,ucholE

22. AT C A in$tantaneou$ oer current

2. AT C , in$tantaneou$ oer current

2+. AT C A ,ucholE

2). AT C , ,ucholE

26. >ailure o! +8V D3 $upplie$ AVR /

27. ?citation Tran$!ormer in$tantaneou$ oer current AVR /

28. ?citation Tran$!ormer oer current 5ela'e5 $ta4e AVR /

2<. Rotor oer olta4e AVR/

*. >ailure o! three or more th'ri$tor bloc9$ AVR/

. 3LA"" C ,

1. ;enerator bac9up impe5ance

2. Lo$$ o! e?citation an5 un5er olta4e

. Ne4atie $eJuence 1< $ec

+. ;T ,ac9up impe5ance

). "tator water !low V.Low 2 min/

6. "tator water con5uctiit' V.@i4h

7. Damper tan9 leel emer4enc'

8. ;T bac9up earth !ault rela' operate5

<. ;T win5in4 temperature er' hi4h

1*. ;T oil temperature er' hi4h

11. AT CA win5in4 temperature er' hi4h

12. AT CA oil temperature er' hi4h

+



1. AT C, win5in4 temperature er' hi4h

1+. AT C, oil temperature er' hi4h

1). Re4ulator $uppl' !u$e !ailure AVR/

16. Th'ri$tor !an $uppl' !ailure 3, trip AVR/

17. ?citation tran$!ormer oer temperature $ta4e AVR/

18. anual channel !ailure AVR/

Documents

Protections and Interlocks for 210 MW LMW Turbines