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Earthing Trafo and NGR Calculation
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Earthing Trafo and NGR Calculation
Earthing TrafoFull description...
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631 Earthing Systems Fundamentals of Calculation
Siemens Ltd., Kolkata
Simplex Engg. & Foundry Works (P) Ltd. R!L " #SP P$ System %or F " ' & Earting *rans%ormer & !+R seletion and details
11.02.2009
132 KV, 31.5 KA Sym
Y
132 / 11 KV 56.25 MVA 12.50%
Ear!"#g $rafo.
e&ral 'ro&#("#g )es"sor 6.6 KV SoureVolage* +a&l leel*
132 KV 7201.656 MVA
ain *rans%ormer Pr"mary olage*
V1
132 KV
Se-o#(ary Volage* aa-"y* me(a#-e*
V2
11 KV 56.25 MVA 0.125 .&.
Earting *rans%ormerVE$1
11 KV
o
100 A 30 se-
Arox"mae al&e of e&ral gro&#("#g res"sor > V2 x 1000 / 1.732 x o
)'a
63.5 63.510 108 8 !ms !ms
o#s"(ere( al&e of e&ral 'ro&#("#g )es"sor
)'
Pr"mary olage* 4"#e 4"#e Eart Fault $urrent4"m""#g al&e* &ra"o#* $alulation-
:ase MVA :ase olage :ase res"sa#-e > :ase KV2 / :ase MVA
50 ! !m s 56.25 MVA 11 KV 2.15 2.151 11 !ms !ms
So&r-e me(a#-e > :ase MVA / So&r-e fa&l leel
?S
0.007; 0.007;1070 107035 35 .&. .&.
$oal So&r-e < $rafo me(a#-e
?$
0.132;107035 .&.
$oal So&r-e < $rafo me(a#-e "# !ms
?$
0.2;57 ! !ms
$oal So&r-e < $rafo me(a#-e Pos""e se=&e#-e
?$1
0.2;57 !ms
$oal So&r-e < $rafo me(a#-e ege"e se=&e#-e
?$2
0.2;57 !ms
+a&l leel o# 11 KV s"(e > :ase MVA / ?$
823.5 823.58 8 MVA MVA
Ma"# $rafo se-o#(ary P!ase Volage "# Vols*
V2P!
Ear!"#g $rafo s!or "me ra"#g > @3 x V2P! x o/3
E$
6351.08 Vo Vols 635 635 KVA KVA
Volage e=&a"o# of ear! fa&l e=&"ale# -"r-&" V2P! > o x )' < o / 3 x ? $1 < ?$2 < ?E$o Ear!"#g $rafo Bero se=&e#-e me(a#-e "# !ms* > 3 x @V2P! / o )' ?$1 ?$2
261353763.xls
?E$o
39.9 39.959 59; ; !ms !ms
Page 1 of 2
Siemens Ltd., Kolkata
Simplex Engg. & Foundry Works (P) Ltd. R!L " #SP P$ System %or F " ' & Earting *rans%ormer & !+R seletion and details
Ear!"#g $rafo Bero se=&e#-e me(a#-e "# .&.* > ?E$o "# !ms x E$/V22
?E$o
?E$o / ?$1
11.02.2009
0.2097 .&. 139.;7
Spei%iation o% Earting *rans%ormer)efere#-e sa#(ar( Max"m&m amC"e# emera&re )ae( 4"#e Volage D"g!es Sysem Volage +a&l leel o# l"#e s"(e o. of !ases ero se=&e#-e me(a#-e "# !ms ero se=&e#-e me(a#-e "# .&. $olera#-e o# Bero se=&e#-e me(a#-e Ve-or 'ro& +a&l &rre# !ro&g! e&ral S!or "me ra"#g of "#("#gs f ') "s s!ore( S!or "me KVA ra"#g #s&la"o# leel m&lse #s&la"o# leel Poer fre=&e#-y ool"#g #s&la"o# "#("#g maer"al $emera&re of "#("#g afer 100 A for 30 se$emera&re of "#("#g afer 159 A for 5 se-
S 2026 50 (eg. 11 KV 7.2 KV 823.58 MVA 3 39.959; !ms / !ase 0.2097 .&. 0%, <20% #0 100 A for 30 se-. 15;.98 A for 5 se-. 635 KVA for 30 se-. 75 KV 2; KV A lass A oer As er S 2026 As er S 2026
#-om"#g erm"#a"o# s&"aCle for 13/, 150 S=.mm Al ea-!aCle aCle Cox ?4PE -aCle e&ral :&s!"#g 11KV, 500 A m"#"m&m 1 o. +""#gs* 2 #os. Ear!"#g erm"#al Exlos"o# e# 4"f"#g !ooFs o&Cle floa :&-!!olB relay "! alarm a#( r" -o#a-s G#(er Case -!a##el "! C"("re-"o#al rollers Mars!all"#g Cox $!ermomeer o-Fe o#seraor "! "#(o ye o"l leel ga&ge S"l"-a 'el Crea!er ra"# a#( f"ler ales Ha-F"#g a(s :&s!"#g ye 4"#e s"(e $* 3 #os. 100/1 A, -lass 5P20, 10 VA o#e for ea-! !ase e&ral $* 1 #o. 200/1 A, -lass 5P20, 10 VA
261353763.xls
Page 2 of 2
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