Vector Shift Protection (ANSI 78) relay Settings for
Vector Shift Protection (ANSI 78) relay Settings for
Generator parallel operation with Grid.
Generator parallel operation with Grid.
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''*+'** ','* AM ''*+'** ','* AM
I a" woring in a Generation pro-ect that we operate */V0 phase0 10 /'230 */''4PM0 I a" woring in a Generation pro-ect that we operate */V0 phase0 10 /'230 */''4PM0 +M1 nat#ral gas
+M1 nat#ral gas Generator set connected Generator set connected to ++V to ++V grid thro#gh a grid thro#gh a */ V5++V*/ V5++V0 0 d6N**d6N**0 0 StepStep #p ransfor"er.
#p ransfor"er.
Generator set control syste" is designed to operate the set parallel with the grid and we hae Generator set control syste" is designed to operate the set parallel with the grid and we hae installed 1oodward 9S relay at Mains ++V :! 0 for resync0 and to proide 4;:;&
installed 1oodward 9S relay at Mains ++V :! 0 for resync0 and to proide 4;:;& (ANSI8*4)0 and Vector shift protection(ANSI78).
1e followed the g#ide lines of <= G/> codes and we set the ector sift setting to ? @eg. !#t we are eperiencing freB#ent ector shift relay actiations0 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 $y ++V feeders we are eperiencing switching s#rges and hence0 triggers o#r ector shift relay.
I hae noticed in %"$edded generation tet $oos 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 $ad for the GeneratorD 1hat are the other options we hae to protect the generatorD
I thin pole slip protection 78PS0 is si"ilar to ector shift and we sho#ld incorporate pole slip protection and increase ector shift al#e to *+ deg.
2ae yo# co"e across this ind of a sit#ation and I #nderstand large n#"$er of e"$edded generation applications in <=0 and they follow G/> code.
:an so"e yo# please indicate yo#r co""ents in this regard.
S#"#d# Alwis
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alba
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4e, Vector Shift Protection (ANSI 78) relay Settings for
Generator parallel operation with Grid.
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''++'** '?,*+ AM
? @eg is too low. 8 @eg is o we are operating ** =V Grid with 8 @eg Setting.If yo#r Grid is Poor he setting can go <p to *' @eg.
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4e, Vector Shift Protection (ANSI 78) relay Settings for
Generator parallel operation with Grid.
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''7+'** '8,++ PM 2i0
A setting of ? @eg will wor only when yo# hae *+ =V and a$oe Grid connected... ** V F ++ V grid is #s#ally set $etween 8 to *' @eg (depending on the sta$ility) and V is "a 8 @eg. he "ost i"portant protection for grid parallel operation is a field fail#re protection. If yo# hae a :@V4 ena$le the loss of field protection and connect the :@V4 fa#lt contact to trip the generator.
2ope this will help..
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4e, Vector Shift Protection (ANSI 78) relay Settings for
Generator parallel operation with Grid.
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'7+7+'** *',+> AM @ear Mr.Sriatsa0
he sche"e "entioned $y yo# is s#ita$le for $oth Gas gen sets and @.G. Sets. 1hat are the reco""ended al#es for 4;:;& in a *+ V syste"D
hans and !est 4egards IB$al Sattar
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4e, Vector Shift Protection (ANSI 78) relay Settings for
Generator parallel operation with Grid.
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'7+7+'** *',/ PM 2i IB$al0
he :@V4 is :aterpillar @igital Voltage 4eg#lator.. 6o# can tae it to $e any @igital Voltage 4eg#lator with 9oss of %citation protection.
he Vector shift is an electrical characteristic and is the sa"e for any type of f#el or pri"e "oer. It will depend on the "achine si3e and electrical withstand capa$ility of the "achine in ter"s of asynchrono#s operation..
he 4;:;& is a "echanical f#nction and will not depend on grid oltage.. <s#ally the g#idelines #sed is the acceleration rate of the "achine set .. As an ea"ple if yo# set the
acceleration ti"e as /' 4PM5sec then the corresponding 4;&: threshold is *.? 235sec for a pole "achine.. he 4;&: sho#ld $e set a$oe this point..
2ope this will $e of help to yo#..
Please feel free to as for any "ore clarifications if needed... Message ( of *+ (/0*> Views)
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Generator parallel operation with Grid.
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'7+8+'** '>,+? AM hans Sriatsa0
Is there any g#iding al#es on ector shift angle setting on relaysD 4egards
IB$al
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4e, Vector Shift Protection (ANSI 78) relay Settings for
Generator parallel operation with Grid.
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'7+8+'** '>,' PM @ear Mr. IB$al Sattar0 6o# are welco"e..
6es there are "any articles giing reco""endations for ector shift angle protection.. Many are co"ple . he one etract I fo#nd easy and si"ple to follow and #s#ally wors in "ost of the syste"s is fro" a $oo on @istri$#ted generation. he releant page is attached for yo#r reference.. It depends on how sta$le the grid is.. &ro" "y eperience $etween 8 to *' @eg wors well in "ost syste"s..
2ope yo# will find this #sef#l..
Please feel free to contact if yo# need any f#rther assistance.. 4egards
Attach"ents,
ector shi*t angle recos+pd* &, K-Message . of *+ (/0*+> Views)
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4e, Vector Shift Protection (ANSI 78) relay Settings for
Generator parallel operation with Grid.
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'7+>+'** '>, AM hans Sriatsa0
Appreciate yo#r cooperation.
IB$al
Pacific %ngineering =arachi 0 Paistan !!!+paci*icp/+co
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4e, Vector Shift Protection (ANSI 78) relay Settings for
Generator parallel operation with Grid.
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'>'>+'** '7,+8 AM edited '>'>+'** '7,+> AM dear Sir0
we want a s#ggestion fro" yo# that one of o#r friend is operating /M1 parallel with **= grid since years and they hae 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
4I1AN.
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4e, Vector Shift Protection (ANSI 78) relay Settings for
Generator parallel operation with Grid.
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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 tae 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 actiated 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 heay 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 heay loading of the engine and Vector Shift is to protect Generator fro" the a#to reclose f#nction or heay fa#lts on the grid which can p#ll the genset o#t of synchroni3ation.
2ope this will $e of help.. !est 4egards
4e, Vector Shift Protection (ANSI 78) relay Settings for
Generator parallel operation with Grid.
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'++'* '>,*' PM @ear Sriatsa0
IE" a green hand in generator control field. I get in tro#$le in designing. if i want to sh#tdown the generator $y #sing eternal inp#t to trip the :@V40 the :@V4 s#pports it or notD
!y the way0 can i connect eternal nor"al closed contact to the :@V4 sh#tdown5fa#lt drierD Message 11 of *+ (/ Views)
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'*?+'* '?,'> AM 2ello Sriatsa0
hans for the info yo# proided 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.
