Agenda Items for 24th PCC Meeting

Agenda items of NERLDC for 24nd PCC Meeting of NER

1. Grid Disturbance during Ju!"14

On 25.07.14 at 05:14:18.820 Hr, 400 kV Balipara – Ranganadi II line tripped (Balipara :

Direti!nal "#$ %it& 1'22 )e dela*, D+ reeie - Ranganadi : arrier reeie,

Oer!ltage pr!teti!n/, at 05:14:15.'20 Hr, 400 kV Balipara – Ranganadi I line

tripped r! Ranganadi end !nl* (Balipara : +ie B tripped, ain B did n!t trip -

Ranganadi : D, 31, R"/. +&e 400 kV Balipara – Ranganadi I line %a) Hand +ripped

r! Balipara later.

De t! tripping ! a6!e line), p!%er )ppl* t! 3ir! - Itanagar area) ! rna&al

rade)& - !&pr area ! ))a di)rpted.

t 05:14:24.800 Hr, 220 kV 9aagri – Balipara line tripped (9aagri – D, 31, B"

- Balipara – ! tripping/, at 05:14:25.107 Hr, 400 kV i)a – Balipara II line tripped

(i)a – Direti!nal "#$ %it& 1800 )e dela* - Balipara – ! tripping/ - at

05:14:25.18; Hr 400 kV i)a – Balipara I line tripped (i)a – D+ reeied - Balipara

– Oer!ltage pr!teti!n/.

De t! tripping ! 400 kV i)a – Balipara D# line) - 220 kV 9aagri – Balipara

9# line, 9!t&ern part ! "R rid ("R rid e<ept 3ir!, Itanagar - =&pi area) !

rna&al rade)& - !&pr, Dep!ta - D&aliga!n area ! ))a/ %a) !nneted %it&

re)t ! "R rid t&r!g& narr!% !rrid!r 220 kV B+9 – gia line.

ter tripping ! a6!e eleent), at 05:14:27.585 Hr, 220#1>2 kV, 2<50 V I+ at

Balipara tripped, %&i& led t! di)rpti!n ! p!%er )ppl* in Dep!ta area ! ))a -

=&pi area ! rna&al rade)&.

t ar!nd 05:21 Hr, 22# $% A&ara ' (arusa)ai D*C ines - 220 kV ?ara – B!k! and

220 kV B!k! – 9ar)a@ai 9# tripped. De t! tripping ! t&e)e eleent), 9!t&ern part

! "R rid )eparated r! re)t ! "R rid. $reAen* ! t&e 9!t&ern part ! "R

rid )&!t pt! 51.15 H? (a) per /.

t 05:>4:10.880 Hr, 9!t&ern part ! "R rid !llap)ed de t! l!ad generati!n

i)at&.

+,e foo-ing issues reated to aboe grid disturbance are to be discussed/0

C&et&er an* $R !perated – I !perated, ant ! l!ad relie et.

C&* I)land ! 1 - I)land ! 2 %ere n!t !red.

R!!t a)e ! di)tr6ane.

96i))i!n ! Di)tr6ane Re!rder - "ent E!gger !tpt

96i))i!n ! Rela* $lag

Re)p!n)e ! RO

Load Loss / 14 M3 Generation Loss/ 1564 M3

2. Root cause ana!sis of tri77ing of 8(+( eements due to 7robem of state s!stem

It &a) 6een !6)ered t&at )!e I9+9 eleent) tripped de t! pr!6le ! )tate )*)te.

De t! tripping ! t&e)e I9+9 eleent), relia6ilit* ! t&e )*)te reded. R!!t a)e !

tripping ! t&e)e eleent) t! 6e anal*?ed.

. Paatana Modue 8 +ri77ing 9 nos.:

a/ t ##24 ;rs on #5.#<.14, alatana + I tripped. De t! tripping ! +I, 9+

I al)! tripped. +&ere %a) a generati!n l!)) ! M3.

6/ t 12 ;rs on #5.#<.14, alatana + I tripped. De t! tripping ! +I, 9+

I al)! tripped. +&ere %a) a generati!n l!)) ! 2#2 M3.

/ t 1<26 ;rs on #5.#<.14, alatana + I tripped. De t! tripping ! +I, 9+

I al)! tripped. +&ere %a) a generati!n l!)) ! 1=6 M3.

+,e Probabe cause of t,e aboe eents to be discussed. 3,et,er an! remedia

measures -ere ta$en of t,e aboe eents.

4. Reiabiit! 8ssues in NER 9< Nos.:

a/ At 1245 ;rs on #<.#<.14> 220 kV Balipara – 9aagri 9# tripped.

6/ At 145# ;rs on 1#.#<.14> 220 kV gia – ?ara 9# tripped.

/ At 145# ;rs on 1#.#<.14> 400 kV 9il&ar – ?ara 9# tripped.

d/ At 1=55 ;rs on 1#.#<.14> 400 kV Binagri – B!ngaiga!n I tripped.

e/ At #=42 ;rs on 1<.#<.14> 400 kV Balipara – i)a I tripped.

/ At 124# ;rs on 1<.#<.14> 220 kV 9aagri – Fa%a&arnagar 9# tripped.

g/ At 1#4 ;rs on 1.#<.14> 220 kV ?ara – 9ar)a@ai I tripped.

Due to tri77ing of t,e aboe mentioned ines> reiabiit! of NER Grid reduced and

NER Grid -as o7erated in unerabe condition.

+,e Probabe cause of t,e aboe eents are to be discussed. 3,et,er an! remedia


5. Disturbance in Mani7ur (!stem 9< nos.:

a: At #21 ;rs on #5.#<.14> 1>2 kV Ip&al(/ – Ip&al I and II line) tripped. De t!

tripping ! t&e)e eleent), p!%er )ppl* t! Ip&al area ! anipr %a) interrpted.

Load Loss/ 6 M3

b: At 1<25 ;rs on #6.#<.14> 1>2 kV Ip&al(/ – ingt&!k!ng 9# and 1>2 kV

E!ktak – ingt&!k!ng 9# line) tripped. De t! tripping ! t&e)e eleent), p!%er

)ppl* t! ingt&!k!ng area ! anipr %a) interrpted.

Load Loss/ 2# M3

c: At #12 ;rs on 1<.#<.14> 1>2 kV Ip&al(/ – ingt&!k!ng 9# and 1>2 kV

E!ktak – ingt&!k!ng 9# line) tripped. De t! tripping ! t&e)e eleent), p!%er

)ppl* t! ingt&!k!ng area ! anipr %a) interrpted. l)!, t&ere %a) generati!n

l!)) at E!ktak de t! 6aking d!%n in !rder t! !ntr!l line l!ading).

Load Loss / 1# M3

Generation Loss / 45 M3 9Lo$ta$:

d: At 122 ;rs on 1.#<.14> 1>2 kV Ip&al(/ – Ip&al I and II line) tripped. De t!


Load Loss/ 6 M3

e: At #445 ;rs on 22.#<.14> 1>2 kV Ip&al(/ – Ip&al I and II line) tripped. De t!


Load Loss/ 5 M3

f: At 1<1 ;rs on 26.#<.14> 1>2 kV E!ktak – Ip&al 9# and 1>2 kV E!ktak –

ingt&!k!ng 9# line) tripped. De t! tripping ! t&e)e eleent), p!%er )ppl* t!

part ! anipr %a) interrpted.

Load Loss/ <1 M3

g: At 142# ;rs on #2.#.14> 1>2 kV Ip&al(/ – Ip&al I - II line) tripped and 1>2

kV E!ktak – ingt&!k!ng. De t! tripping ! t&e)e eleent), p!%er )ppl* t!

a@!r part ! anipr )*)te %a) aeted. $rt&er, t&ere %a) generati!n l!)) de t!

6aking d!%n ! E!ktak H" t! aintain )ae line l!ading).

Load Loss/ <# M3

Generation Loss/ 5 M3 9Lo$ta$:

+,e Probabe cause of t,e aboe eents are to be discussed. 3,et,er an! remedia


6. Disturbance in Meg,aa!a (!stem 92 nos.:

a/ At 2#2 ;rs on 24.#<.14> 1>2 kV Ee)&ka – =&lei&riat I and II tripped, re)lting in

tripping ! all > rnning nit) ! Ee)&ka H".

Generation Loss/ 126 M3 9Les,$a:

6/ At #5= ;rs on 2=.#<.14> t&ere %a) ltiple tripping ! line) r! 1>2 kV

=&lie&riat )6)tati!n ! e+E, in %&i& 1>2 kV =&lei&riat(/ – =&lei&riat I -

II tripped al!ng %it& 1>2 kV Ee)&ka – =&lei&riat I and II, re)lting in tripping ! all

> rnning nit) ! Ee)&ka H" and l!ad l!)) in =&lei&riat area ! eg&ala*a.

Load Loss / 55 M3

Generation Loss/ 1#5 M3 9Les,$a:



<. Disturbance in Ca7ita Area of Assam 94 nos.:

a/ At 1### ;rs on #4.#<.14> 220 kV 9ar)a@ai – 9aagri II, 220 kV 9aagri –

Fa%a&arnagar, 220 kV Fa%a&arnagar – 9ar)a@ai, 220 kV gia – ?ara 9# and 220

kV ?ara – 9ar)a@ai I - II re)lted in l!ad l!)) in apital area ! ))a.

Load Loss/ 21# M3

6/ At 1144 ;rs on #4.#<.14> 220 kV 9ar)a@ai – 9aagri II tripped, %&ile !t&er

!nneting line) %ere !t ! )erie, leading t! l!ad l!)) in apital area ! ))a.

Load Loss/ 245 M3

/ At 121# ;rs on #4.#<.14> 220 kV 9ar)a@ai – 9aagri II tripped, %&ile !t&er

!nneting line) %ere !t ! )erie, leading t! l!ad l!)) in apital area ! ))a.

Load Loss/ 2## M3

d/ At 2#15 ;rs on #.#<.14> 1>2 kV 9ar)a@ai – =a&elipara II, III - IV tripped %&ile

1>2 kV 9ar)a@ai – =a&elipara I %a) !t ! )erie, leading t! l!)) ! l!ad in apital

area ! ))a.

Load Loss/ 62 M3



. Disturbance in +ri7ura (!stem 92 nos.:

a/ At 2#5< ;rs on 2#.#<.14> 1>2 kV + – gartala I - II line) tripped. De t!

tripping ! t&e)e line), t&ere %a) generati!n l!)) at + de t! 6aking d!%n.

Generation Loss/ 6 M3

6/ At #11< ;rs on 2<.#<.14> 1>2 kV + – gartala II line and 1>2 kV gartala –

=arg&at 9# line) tripped. t t&e )ae tie, t&ere %ere tripping) in +ripra

)*)te ! 1>2 kV gartala – R!k&ia I - II and 1>2 kV gartala – D&ala6il line).

De t! t&e)e tripping), + G 1 and 4 al)! tripped. +&e)e re)lted in l!ad l!))

in part ! +ripra )*)te and generati!n l!)) at +.

Load Loss / 25 M3

Generation Loss/ 6 M3



=. Ma)or Eents in Nort,0Eastern Regiona Grid

Ei)t ! ltiple tripping ! eleent) and tripping ! ip!rtant eleent) in !rt&

"a)tern Regi!nal rid dring t&e peri!d -.e.f. #1st June> 2#14 to #t, June> 2#14 are

atta&ed al!ng%it& (Eetter) !r ?urnis,ing Eent information !n %eekl* 6a)i) are

6eing )ent t! t&e p!%er tilitie) ! "R 6* eail %.e. 1>t& Fanar*, 2014/.

!n)titent) are reAe)ted t! rni)& detail) ! tripping rep!rted in t&e letter).

Agenda Items for 24th PCC Meeting

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