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Earthing Calculation

QPCC

QATAR PETROCHEMICAL COMPLEX PROJECT

MESAIEED, QATAR

Foster #$ee%er Ener& 'imite(

F# Cont No: 1-14-3480/352)

Do* C%ass: 1

D1 12/2008 For in!ormation P#R DR DR

01 0+/0+/08 For ,nterna% *omment P#R R DR

R! Dat D"cri#tion Orig $% Ch&'( $% A## )% ClintA##

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.$is (o*ument is issue( b& Foster #$ee%er Ener& 'imite( !or an( on be$a%! o! PCC Do$a atar .$e in!ormation *ontaine( in t$is(o*ument is t$e *on!i(entia% roert& o! PCC ,t *annot be (is*%ose( *oie( or use( !or an& urose it$out t$e arova% o! PCC , !&ou are not aut$orise( to ossess t$is (o*ument %ease (estro& it imme(iate%&

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CONTENTS

1 AR63

2 E.7D 4

3 RE'.)

4 RECENDA.,N10

APPEND,9 1 11

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1. SUMMAR*+

.$is roun(in stu(& is er!orme( to AN,/,EEE t( 80 2000 .$e !in(ins are as !o%%os

11 .ou*$ ;o%taes

.$e resu%ts s$o t$at t$e *a%*u%ate( a*tua% tou*$ vo%tae is %ess t$an t$e a%%oab%e tou*$vo%tae .$is is t$e *ase $en t$e *a%*u%ations use t$e 04roun( >ri( Resistan*e

.$e *a%*u%ate( !ina% roun( ri( resistan*e is 008

14 inimum Don 'ea( i?e

.$e minimum *a%*u%ate( tota% (on %ea( area is "00mm2

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2. METHOD

.$is stu(& is base( on AN,/,EEE t( 80-2000 ,EEE >ui(e !or a!et& in AC ubstation>roun(in

.$e main ob@e*t o! t$is stu(& is to (esin t$e substation roun(in arranement an(substation above ra(e (on *on(u*tor si?es .$e *a%*u%ation is er!orme( !or t$e orst*ase !au%t %eve% ratin o! sit*$ear .o avoi( e*essive *onstru*tion *osts t$e (esins$ou%( be otimise( at t$e EPC stae !or ea*$ substation sit*$ear ratin

21 inimum Con(u*tor i?in

.$e minimum *on(u*tor si?e is se%e*te( b& usin E=uation 40 o! AN,/,EEE t( 80-2000

.$e *on(u*tor si?es re*ommen(e( in t$is stu(& i%% be !or a Borst *ase an( assumestan(ar(isation o! *$osen si?es a*ross a%% substations $ere a%i*ab%e !or (on %ea(s an(roun(in ri(s

.$e !o%%oin (esin va%ues are use(

, ubstation rms !au%t *urrent in

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22 te an( .ou*$ ;o%taes

.o %imit t$e (rivin vo%tae o! an a**i(enta% *ir*uit it is ne*essar& to (etermine t$emaimum va%ue o! ste an( tou*$ vo%taes

221 te ;o%taes

.$e !o%%oin assumtions are ma(e !or (ata re=uire( b& ,EEE-80:

aG A bo(& ei$t o! 50H is use(

bG t$e eart$ !au%t i%% %ast !or a maimum (uration o! 05 se* ba*roun( !au%t *urrent s$a%% be t$e $i$er o! t$e %ine to %ine to roun( or t$e s&mmetri*a%%ine to roun( !au%t *urrent

(G ,n *a%*u%ations o! t$e ri( *urrent t$e *urrent (ivision !a*tor is assume( to be 10

eG For *a%*u%ations o! a%%oab%e ste an( tou*$ otentia%s t$e resistivit& o! t$e sur!a*emateria% r$osG s$a%% be assume( to be 2000 o$m-meters !or a minimum +5mm t$i*< a( o!*%ean *rus$e( ro*

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2000 -m base( on a 150mm %a&er o! *rus$e( ro*

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.$e su%& to t$e PCC %ant is via un(erroun( *ab%e .$ere!ore it is *onsi(ere( t$att$ere i%% be no (iversion o! roun( *urrent !rom t$e roun( ri( as mi$t be t$e *ase i!over$ea( %ines ere use( see ,EEE-80 e*t 15"G .$is aroa*$ is *onsi(ere(*onservative as inorin t$is e!!e*t resu%ts in a more onerous roun( ri( re=uirementimi%ar%& t$e e!!e*ts o! an& be%o ra(e *ab%e armour an( ies in t$e sit*$&ar( areinore(

.$ere!ore ,is assume( e=ua% to , !

Thu" gi!ing Ig0 1--&A

232 aimum >ri( Current

.$e maimum ri( *urrent is iven b&

,> CD!, e= 5

$ere:

,> maimum ri( *urrent in Ams

C *orre*tive ro@e*tion !a*tor a**ountin !or t$e re%ative in*rease o! !au%t *urrents(urin t$e station %i!e san t$e ratin o! t$e sit*$ear is 100ri( Resistan*e !or ubstation

.$e ob@e*tive is to (esin a substation ri( arranement it$ an overa%% resistan*e 1

.$e re%iminar& substation ri( %a&out is as s$on in (rain 3481-8532-+2-0003 .$e 33

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ri( is (ire*t burie( at a (et$ o! 05m .$e erimeter %oo is *onne*te( to roun( ro(s at10m interva%s

.$e roun( soi% *$ara*teristi*s are iven in Furo reort P/1001/04/02

sin t$e *omuter mo(e% reresentation o! t$e roun( ri( Aen(i 1G t$e roun( ri(resistan*e is *a%*u%ate( as:

Rg0 -+-6 +

.$is satis!ies t$e re=uirement !or substation ri( resistan*e to be 1

25 33roun( Potentia% Rise >PRG

.$e >RP >roun( Potentia% RiseG is iven b& t$e ro(u*t o! ,>an( R> $i*$ is 105200A 010 1052HmHi / ' e= "

$ere:

Hm 1/2J%n D2 /1"$( I DI2$G2 / 8(D $/4(G I H ii/

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D 5m

$ 045m

n +3

D 000)5m

$o 05m re!eren*e (et$ o! roun( ri(G

Hi 13212 I 01+2 +3

' 'CIJ155I122'r/K '2I'&2LGM'R

From Aen(i 1

EM0 /784 9 1-/+5&A

253 te ;o%tae

sin Es ,>HsHi / ' e= 10

$ere:

Hs 1/J1/ 2$ I 1 / DI$G I 1-05n-2G/ D e= 11

' 0+5'*I 085 'rG e= 12

From Aen(i 1

E"0 /-4

3. RESULTS

31 te an( .ou*$ ;o%taes

Etou*$50 "22; ermitte(G 54+; *a%*u%ate(G

Este50 1))); ermitte(G "50; *a%*u%ate(G

32 >roun( >ri( Resistan*e

R 008

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4. RECOMMENDATIONS

#it$ t$e eo%oi*a% stru*ture as use( in t$ese stu(ies t$e resu%ts are a**etab%e 7oeverEPC is a(vise( t$at t$e a*tua% eo%oi*a% stru*ture an( ater tab%e (et$ is to be(etermine( b& site investiation .$e *a%*u%ation s$ou%( t$en be revise( to re!%e*t t$e!in(ins o! t$e site surve&

#et orani* soi% $as been ta

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APPENDIX 1

Comuter Proramme Resu%ts

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