tg prll wd grid

8/9/2019 tg prll wd grid

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CONCEPT OF TG

PARALLEL WITHGRID



“TG parallel with grid” feedback is given tosteam governing system and to generator AVR.

Based on the !"## stat$s of “TG parallel withgrid” feedback% governing system changes its

mode of operation between speed control mode& mw control mode.

Based on the !"## stat$s of “TG parallel withgrid” feedback% generator AVR changes its mode

of operation between voltage control mode &power factor control mode.

To $nder stand how and from where the “TGparallel with grid” feedback is taken% it isre'$ired to go thro$gh switchyard scheme andthe breakers associated to create path betweenTG and grid to e(port power.



)*+ switchyard is b$ilt with “BR*A,*R A!-

A+#” con/g$ration. )+-s in following slides will

give a better idea abo$t power e(port pattern in

di0erent conditions.1. All breakers are in ## position.2. All fo$r 3nits are r$nning and both transmission

lines are available for e(porting power to grid.4. Generator protection operated and G5B61

tripped.7. GT61% 3AT61 protection operated and G5B61%

GT5B61 and T8*61 breakers tripped.

9. :hen )*+ to !ellore ;ooling )tation line istripped% total power will be e(ported thro$gh)*+ to <*;+ inter connection line and there willnot be any dist$rbance to r$nning $nits.

=. :hen )*+ to <*;+ inter connection line tripped%total power will be e(ported thro$gh )*+ to



NPS LINE MEPL I/C LINE

89-1 89-2

GEN-1 GEN-2 GEN-3 GEN-4

GT-1 GT-2 GT-3 GT-4

GCB-1 GCB-2 GCB-3 GCB-4

GTCB-1 GTCB-2 GTCB-4GTCB-3

TIE-3 TIE-4 TIE-2 TIE-1

LINE-1 LINE-2 LINE-3 LINE-4

BUS-2

BUS-1

8 8 8

8

8 8 8 8

89-17

89-18403 89-

T

406 89-

T

41 89-

T

418 89-

T

A++BR*A,*R) AR*8! ##;)8T8

!




89-1 89-2

403 89-

T

89-17

89-18


GT-1 GT-2 GT-3 GT-4





BUS-2

BUS-1

8 8 8

8

8 8 8 8406 89-

T

41 89-

T

418 89-

T

A++ 73!8T)AR*R3!!8!G A!-T:

T"<+8!*)AR*AVA8+AB+*




89-1 89-2

403 89-

T

89-17

89-18


GT-1 GT-2 GT-3 GT-4





BUS-2

BUS-1

8 8 8

8

8 8 8 8406 89-

T

41 89-

T

418 89-

T

G*!*RATR61;RT*5T8!;*RAT*

- A!-G5B61TR8;;*-




89-1 89-2


GT-1 GT-2 GT-3 GT-4





BUS-2

BUS-1

8 8 8

8

8 8 8 8

89-17

89-18403 89-

T

406 89-

T

41 89-

T

418 89-

T

GT"3AT

;RT*5T8!;*RAT*- A!-GT% T8*&G5B

TR8;;*-




89-1 89-2


GT-1 GT-2 GT-3 GT-4





BUS-2

BUS-1

8 8 8

8

8 8 8 8

89-17

89-18403 89-

T

406 89-

T

41 89-

T

418 89-

T

!;)+8!*TR8;;*-




89-1 89-2


GT-1 GT-2 GT-3 GT-4





BUS-2

BUS-1

8 8 8

8

8 8 8 8

89-17

89-18403 89-

T

406 89-

T

41 89-

T

418 89-

T

<*;+8"5+8!*

TR8;;*-




89-1 89-2


GT-1 GT-2 GT-3 GT-4





BUS-2

BUS-1

8 8 8

8

8 8 8 8

89-17

89-18403 89-

T

406 89-

T

41 89-

T

418 89-

T

BT+8!*)TR8;;

*-



!3<B*R # ;AT) AVA8+AB+* #R TG61 T *?;RT ;:*R T

GR8-

1@ G5B61% 71 C6T% T8*61% C61

2@ G5B61% 71 C6T% GT5B61% GT5B62% T8*62% +8!*62% +8!*61% C61

4@ G5B61% 71 C6T% GT5B61% C61% GT5B64% T8*64%+8!*64% C61>%

+8!*61% C61

7@ G5B61% 71 C6T% GT5B61% C61% GT5B67% T8*67%+8!*67% C61>%

+8!*61% C61

9@ G5B61% 71 C6T% GT5B61% GT5B62% T8*62% C62

=@ G5B61% 71 C6T% T8*61% +8!*61% +8!*62% C62>@ G5B61% 71 C6T% GT5B61% C61% GT5B64% T8*64%+8!*64% C61>%

+8!*62% C62

@ G5B61% 71 C6T% GT5B61% C61% GT5B67% T8*67%+8!*67% C61>%

+8!*62% C62



C6

1

T8*6

1

71

C6T

G5B6

1 GT5B62

GT5B61

GT5B61

T8*62

+8!*61

+8!*62

C6

1C61>

GT5B64

T8*64

+8!*64

GT5B67

T8*67

+8!*67

GT5B62

T8*62

C6

2T8*6

1+8!*

61+8!*6

2GT5B6

1C61 C61>

GT5B64

T8*64

+8!*64

+8!*62

GT5B6

7

T8*6

7

+8!*6

7

TG61 8! ;ARA++*+ :8T GR8-

T8*61

+8!*61

C61>GT5B6

4T8*6

4+8!*6

4

C6

1

GT5B62

T8*62

+8!*67

T8*67

GT5B67

!$mber of contacts to be taken into line for“TG in parallel with Grid” when line61 and line62!$mber of contacts to be taken into line for“TG in parallel with Grid” when line61 and line62



GT5B61

T8*61G5B6

171C6T

TG61 8! ;ARA++*+ :8T GR8-

!$mber of contacts to be taken into line for“TG in parallel with Grid” when line61 and line62

breakers are e(cl$ded from the circ$it

!$mber of contacts to be taken into line for“TG in parallel with Grid” when line61 and line62

breakers are e(cl$ded from the circ$it



!3<B*R # ;AT) AVA8+AB+* #R TG62 T *?;RT ;:*R T

GR8-1@ G5B62% 77 C6T% T8*62% +8!*62% +8!*61% C61

2@ G5B62% 77 C6T% GT5B62% GT5B61% T8*61% C61

4@ G5B62% 77 C6T% GT5B62% C61% GT5B64% T8*64%+8!*64% C61>%

+8!*61% C61

7@ G5B62% 77 C6T% GT5B62% C61% GT5B67% T8*67%+8!*67% C61>%

+8!*61% C61

9@ G5B62% 77 C6T% T8*62% C62=@ G5B62% 77 C6T% GT5B62% GT5B61% T8*61% +8!*61% +8!*62% C62

>@ G5B62% 77 C6T% GT5B62% C61% GT5B64% T8*64%+8!*64% C61>%

+8!*62% C62

@ G5B62% 77 C6T% GT5B62% C61% GT5B67% T8*67%+8!*67% C61>%



!3<B*R # ;AT) AVA8+AB+* #R TG64 T *?;RT ;:*R

T GR8-

1@ G5B64% 719 C6T% T8*64% +8!*64% C61>% +8!*61% C61

2@ G5B64% 719 C6T% GT5B64% C61% GT5B61% T8*61% C614@ G5B64% 719 C6T% GT5B64% C61% GT5B62% T8*62%+8!*62% +8!*6

1% C61

7@ G5B64% 719 C6T% T8*64%+8!*64% C61>% +8!*62% T8*62% GT5B62%

GT5B61%T8*61% C61

9@ G5B64% 719 C6T% GT5B64% GT5B67% T8*67%+8!*67% C61>% +8!*6

1% C61

=@ G5B64% 719 C6T% T8*64%+8!*64% +8!*67% T8*67% GT5B67% C61%GT5B61% T8*61% C61

>@ G5B64% 719 C6T% T8*64%+8!*64% C61>% +8!*62% C62

@ G5B64% 719 C6T% GT5B64% C61% GT5B62% T8*62% C62

C@ G5B64% 719 C6T% GT5B64% C61% GT5B61% T8*61%+8!*61%+8!*6

) G



!3<B*R # ;AT) AVA8+AB+* #R TG67 T *?;RT ;:*R

T GR8-

1@ G5B67% 71 C6T% T8*67% +8!*67% C61>% +8!*61% C61

2@ G5B67% 71 C6T% GT5B67% C61% GT5B61% T8*61% C614@ G5B67% 71 C6T% GT5B67% C61% GT5B62% T8*62%+8!*62% +8!*6

1% C61

7@ G5B67% 71 C6T% T8*67%+8!*67% C61>% +8!*62% T8*62% GT5B62%

GT5B61%T8*61% C61

9@ G5B67% 71 C6T% GT5B67% GT5B64% T8*64%+8!*64% C61>% +8!*6

1% C61

=@ G5B67% 71 C6T% T8*67%+8!*67% +8!*64% T8*64% GT5B64% C61%GT5B61% T8*61% C61

>@ G5B67% 71 C6T% T8*67%+8!*67% C61>% +8!*62% C62

@ G5B67% 71 C6T% GT5B67% C61% GT5B62% T8*62% C62

C@ G5B67% 71 C6T% GT5B67% C61% GT5B61% T8*61%+8!*61%+8!*6

ll l i h id



8<;RTA!5* # “TG parallel with grid” #**-BA5,T GV*R!R

T$rbine rolling will be carried o$t $sing Governor speedcontrol mode till the t$rbine reaches its rated R;< and

synchroniDation of TG with grid. nce the TG gotsynchroniDed with grid the “TG parallel with grid” commandwill be fed to steam governing system and Governor changesits mode of operation to <: control mode. Governor remainsin the same mode as long as the “TG parallel with grid” !feedback is available. As soon as Governor receives “TGparallel with grid” ## command% it changes its mode tospeed control mode and tries to maintain rated R;< oft$rbine to s$stain the $nit with home load. To bring back thet$rbine to rated R;< )$dden opening or closing of governorvalve will be taken place $p to re'$ired level depends on

c$rrent r$nning R;< of t$rbine. Time delay in receipt of “TGparallel with grid” ## command to Governor plays a verycr$cial role in controlling t$rbine R;<.



GRI

D

CT

!P

T

MW

TR

GV*R!R 8!<: 5!TR+

<-*

ICON"ERTO

R

SPEED SENSOR

GO"ERNING "AL"E

STEAM

CB CLOSED

“TG;ARA++*+ :8TGR8-”!

EH OIL

100#

7#

0#

2#

0#

TURBINE ALTERNATOR

! 3!8T 8) R3!!8!G :8T #3++ +A- A!- *?;RT8!G ;:*R T GR8



GRI

D

CT

!P

T

MW

TR

GV*R!R 8!);**- 5!TR+

<-*

ICON"ERTO

R

SPEED SENSOR

GO"ERNING "AL"E

STEAM

EH OIL

CB CLOSED

“TG;ARA++*+:8TGR8-”##

100#

7#

0#

2#

0#

TURBINE ALTERNATOR

:*! 3!8T 8) 8)+AT*- #R< GR8-

8<;RTA!5* # “TG ll l ith id” #**-BA5,



8<;RTA!5* # “TG parallel with grid” #**-BA5,T AVR

AVR will be in voltage control mode till thesynchroniDation of TG with grid. nce the TG got

synchroniDed with grid the “TG parallel with grid”command will be fed to AVR and its mode ofoperation changes to ;ower factor control mode.AVR remains in the same mode as long as the “TG

parallel with grid” ! feedback is available. Assoon as AVR receives “TG parallel with grid” ##command% it changes its mode to voltage controlmode and tries to maintain rated voltage ofGenerator $sing droop control to s$stain the $nitwith home load. Time delay in receipt of “TGparallel with grid” ## command to AVR plays avery cr$cial role in controlling Generator voltagebefore it reaches the trip limit of ver"3nder

voltage protection.



THAN$ %OU

tg prll wd grid

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