Vector Shift Protection

Vector Shift Protection (ANSI 78) relay Settings for Generator parallel operation with Grid. Options •

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''*+'** ','* AM I a" woring in a Generation pro-ect that we operate */V0  phase0 10 /'230 */''4PM0 +M1 nat#ral gas Generator set connected to ++V grid thro#gh a */ V5++V0 V5++V0 d6N** d6N**00 Step #p ransfor"er.

Generator set control syste" is designed to operate the set parallel with the grid and we hae installed 1oodward 9S relay at Mains ++V :! 0 for resync0 and to proide 4;:;& (ANSI8*4)0 and Vector shift protection(ANSI78).

1e followed the g#ide lines of codes and we set the ector sift setting to ? @eg. !#t we are eperiencing freB#ent ector shift relay actiations0 and hard sh#tdowns of the generator set 0 $eca#se o#r grid s#pply is "ainly $ased on hydro power syste"0 and has ery low stiffness.

@#e to the reclosers operations that is connected to the near $y ++V feeders we are eperiencing switching s#rges and hence0 triggers o#r ector shift relay. I hae noticed in %"$edded generation tet $oos that indicates we sho#ld increase this VS. setting to 8*+ deg as o#r grid syste" is wea.

I need to now that if we increase this setting C Is this $ad for the GeneratorD 1hat are the other options we hae to protect the generatorD I thin pole slip protection 78PS0 is si"ilar to ector shift and we sho#ld incorporate pole slip protection and increase ector shift al#e to *+ deg.

2ae yo# co"e across this ind of a sit#ation and I #nderstand large n#"$er of e"$edded generation applications in code.

:an so"e yo# please indicate yo#r co""ents in this regard.

S#"#d# Alwis Message 1 of *+ (/0/?7 Views) Reply 0 Kudos

alba New "e"$er 

4e, Vector Shift Protection (ANSI 78) relay Settings for Generator parallel operation with Grid. Options

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''++'** '?,*+ AM ? @eg is too low. 8 @eg is o we are operating ** =V Grid with 8 @eg Setting.If yo#r Grid is Poor he setting can go ,+? AM hans Sriatsa0 Is there any g#iding al#es on ector shift angle setting on relaysD 4egards IB$al Message ) of *+ (/0*7 Views) Reply 0 Kudos Sri%atsa :aterpillar %"ployee

4e, Vector Shift Protection (ANSI 78) relay Settings for Generator parallel operation with Grid. Options •

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'7+8+'** '>,' PM @ear Mr. IB$al Sattar0 6o# are welco"e.. 6es there are "any articles giing reco""endations for ector shift angle protection.. Many are co"ple . he one etract I fo#nd easy and si"ple to follow and #s#ally wors in "ost of the syste"s is fro" a $oo on @istri$#ted generation. he releant page is attached for yo#r reference.. It depends on how sta$le the grid is.. &ro" "y eperience $etween 8 to *' @eg wors well in "ost syste"s.. 2ope yo# will find this #sef#l.. Please feel free to contact if yo# need any f#rther assistance.. 4egards  Attach"ents, ector shi*t angle recos+pd* &, KMessage . of *+ (/0*+> Views) Reply 0 Kudos ISattar  Visitor 

4e, Vector Shift Protection (ANSI 78) relay Settings for Generator parallel operation with Grid. Options

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'7+>+'** '>, AM hans Sriatsa0  Appreciate yo#r cooperation.

IB$al

Pacific %ngineering =arachi 0 Paistan !!!+paci*icp/+co

Message  of *+ (/0**> Views) Reply 0 Kudos ri!an*ahad Visitor 

4e, Vector Shift Protection (ANSI 78) relay Settings for Generator parallel operation with Grid.  %dited H Options •

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'>'>+'** '7,+8 AM  edited '>'>+'** '7,+> AM dear Sir0

hope yo# are in good health.

we want a s#ggestion fro" yo# that one of o#r friend is operating /M1 parallel with **= grid since years and they hae only a ector shift protection and no rocof protection is there. As he says that only one protection is reB#ired either a rocof or a ector shif. now yo# tell #s that whether it is necessary to p#t $oth the protection or only one protection is eno#gh to synchroni3e with Grid.

!.40

4I1AN. Message , of *+ (0>* Views) Reply 0 Kudos Sri%atsa :aterpillar %"ployee

4e, Vector Shift Protection (ANSI 78) relay Settings for Generator parallel operation with Grid. Options •

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'>**+'** **,/ PM @ear Mr 4i3wan0 he 4;:& protection is $asically the grid fail#re relay.. his is needed definitely in s"all power plants connected to the grid. ;nce the #tility fails the genset will try to tae the entire load and will p#ll the freB#ency down ery rapid as the load will "e "#ch "ore than the capacity of the generators. @#ring this sit#ation there will not $e any ector shift and hence the set will collapse. his can ca#se da"age to the engine so we need 4;:& protection. he ector shift is $asically to protect against a#to reclose f#nction of the grid. 1hen the a#to reclose is actiated then i""ediately on trip the grid will reclose instantaneo#sly. his an happen o#t of synchroni3ation also so we need the ector shift protection for protecting yo#r generator. Also when there is heay fa#lt on the grid there will $e a condition when the generator can $e p#lled o#t of synchroni3ation. In this condition also the ector shift can occ#r. !asically the 4;:& is for protecting heay loading of the engine and Vector Shift is to protect Generator fro" the a#to reclose f#nction or heay fa#lts on the grid which can p#ll the genset o#t of synchroni3ation. 2ope this will $e of help.. !est 4egards

4e, Vector Shift Protection (ANSI 78) relay Settings for Generator parallel operation with Grid. Options •

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'++'* '>,*' PM @ear Sriatsa0 IE" a green hand in generator control field. I get in tro#$le in designing. if i want to sh#tdown the generator $y #sing eternal inp#t to trip the :@V40 the :@V4 s#pports it or notD !y the way0 can i connect eternal nor"al closed contact to the :@V4 sh#tdown5fa#lt drierD Message 11 of *+ (/ Views) Reply 0 Kudos 3u/as New "e"$er 

4e, Vector Shift Protection (ANSI 78) relay Settings for Generator parallel operation with Grid. Options •

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'*?+'* '?,'> AM 2ello Sriatsa0

hans for the info yo# proided here. Its really helpf#l.

Its generaly said the ector shift setting co#ld $e $etween the range of ?  *+ deg depending on the grid type( stiff or wea). Is there a nown "ethod to deter"ine the relay settings depending on the grid typeD I will really appricate yo#r tho#ght on this.

4egards.