PROJECT NAME: Khabat Thermal Power Plant Units 1! O"NER: Ministr# o$ Electricit# o$ Kur%istan Re&ional 'o(erment CONTRACTOR: CONTRACTO R: POSCO En&ineerin& En&ineerin& Construction Construction Co) *t%) MA+N SU,CONTRACTOR: 'AMA Power S#stems En&ineerin& Contractin& +nc) PROJE RE-ERENCE NO: Revision History Re (
Re(ision .ate
15.09.201 5
.escri/tion
Create% b#
Chec0e% b#
-or Re(iew
A.E. AKMAN
B. GÖKCE
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Emission Status
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.ocument Co%e :
Title3 Subtitle
EARTHING RESISTANCE TEST PROCEDURE
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Pro7ect: Khabat Thermal Power Plant Un8ts 1!
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SUMMAR 1. Test Objectives 1.1. Genera !e"#ire$ents 1.%. &'eci(ic !e"#ire$ents 1.3. )*+ ,O )E NEE, TO *AVE GOO, EA!T*-NG %. *O) TO MEA&0!E EA!T* !E&-&TANCE 3. G!O0N, MAT !E&-&TANCE TE&T-NG &ET02 /. 2!EL-M-NA!+ C*ECK& /.1. ,eter$ining Bac4gro#nd Votages . !ECO!,-NG O5 -N&2ECT-ON AN, TE&T ,ATA
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Pro7ect: Khabat Thermal Power Plant Un8ts 1!
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1) Test Ob7ecti(es 1)1)
'eneral Re>uirements
)e #nderstand t7at gro#nd $ats are engineered to ac7ieve i$'edance eves t7at 'rovide ade"#ate 'rotection and stabiit8 (or a (aciit89 and once instaed t7e8 re$ain '78sica8 and eectrica8 stabe. Man8 :or4ers :o#d t7en as4 ;&o :78 test an e ? To obtain reaistic resistance data (or #se in cac#ating act#a gro#nd 'otentia rise @G2! va#es (or t7e $at9 and (or deter$ining t7e ste' and to#c7 'otentias :7ic7 $a8 occ#r :it7in a station d#ring (a#t or s#rge conditions. ? To 7e' to resove t7e instabiit8 o( e"#i'$ent rea8s or co$$#nications9 :7ic7 $ig7t be ca#sed b8 inade"#ate gro#nding. ? To deter$ine t7e contin#ed ade"#ac8 o( t7e gro#nd $at :7erever s8ste$ c7anges are i$'e$ented :7ic7 increase t7e avaiabe (a#t c#rrent at t7e station. ? To deter$ine t7e e((ect on t7e integrit8 and 'er(or$ance o( t7e gro#nd $at ca#sed b8 4no:n '78sica c7anges @'anned or #n'anned in t7e gro#nding s8ste$. ? To estabis7 ongoing doc#$entation o( t7e stabiit8 and contin#ed 'er(or$ance o( t7e gro#nding s8ste$ b8 'eriodic9 sc7ed#ed $eas#re$ent o( t7e gro#nd $at resistance9 or9 converse89 to detect an8 #ns#s'ected and #ndesirabe c7anges. 1)!)
S/eci$ic Re>uirements
T7e (oo:ing disc#ssion o#tines t7e s'eci(ic re"#ire$ents and test intervas (or testing )esterns gro#nd $ats> ? 5ied O((ices s7o#d estabis7 benc7$ar4 data (or a s#bstation gro#nd $ats. ? Gro#nd $ats (ro$ ne: eectrica (aciities :i be tested to veri(8 t7eir intended design and ade"#ac8. ? )7enever t7e gro#nd $at is $odi(ied9 t7e gro#nd $at s7o#d be tested. ? Gro#nd $ats s7o#d be tested :7enever t7ere is a concern abo#t t7e contin#ed 'er(or$ance o( t7e gro#nding s8ste$
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";? .O "E NEE. TO ;A2E 'OO. EART;+N'@
Pro7ect: Khabat Thermal Power Plant Un8ts 1!
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T7e gro#nding s8ste$ is an essentia ee$ent (or t7e eectrica s8ste$ sec#rit8 and it is re"#ired to> Ao: (or 'rotective devices activation :7en t7ere is an ins#ation (a#t. E"#aie t7e 'otentia o( cond#ctive 'arts t7at can be accessed si$#taneo#s89 :it7 t7e 'otentia in t7e s#rro#nding soi in order to 'revent 'eo'e (ro$ being e<'osed to 7aardo#s votages. Ao: t7e ig7tning stri4e energ8 to be sa(e8 dissi'ated. To !ed#ce eectro$agnetic inter(erences.
5ig#re1> A t8'ica set#' at a ce#ar to:er instaation. Preliminar# +n$ormation
Be(ore beginning t7e test9 t7e (oo:ing in(or$ation $#st be gat7ered and recorded on t7e Gro#nd Mat !esistance9Test !e'ort. ? &tation na$e ? )eat7er and soi conditions ? T8'e and seria n#$ber o( t7e eart7 tester ? C#rrent @C% and 'otentia @2% 'robe distances to be #sed ? A s4etc7 o( t7e test area9 inc#ding s'ecia terrain (eat#res aong t7e 'robe directions ? Na$es o( t7e test coordinator. ? ,ra:ing o( t7e gro#nd 'an (or t7e site9 inc#ding gro#nd $at di$ensions ? Noti(ications9 cearances9 and gate 4e8s t7at $a8 be re"#ired (or :or4ing at t7e site.
!) ;O" TO MEASURE EART; RES+STANCE@
Pro7ect: Khabat Thermal Power Plant Un8ts 1!
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On8 one o( t7e ter$inas is evident in t7e eart7 resistance. -n order to (ind t7e second ter$ina :e s7o#d reco#rse to its de(inition> Eart7 !esistance is t7e resistance e To $eas#re bet:een t7e distance =) 'ROUN. MAT RES+STANCE TEST+N' SETUP
@1 To 'rovide additiona ins#ation to 'ersonne d#ring t7e test9 'ace an ins#ating 'at(or$ or r#bber ban4et on eve gro#nd a s7ort distance (ro$ t7e 'oint o( connection to t7e gro#nd $at @a 'iece o( dr8 '8:ood board9 3/ inc7 t7ic49 3 (eet :ide b8 / (eet ong9 $a8 be #sed in ie# o( a sa(et8 ban4et. 2ace t7e tester on a :ooden test stand @i( avaiabe and on t7e ban4et or board :it7 t7e tester oriented so it can be adj#sted and read :it7o#t tri''ing over t7e test eads ) !B !#n t7e C% and 2% eads to t7e $a -t is i$'ortant t7at t7e test 'robes $a4e good contact :it7 t7e eart7. Ta$'ing t7e eart7 aro#nd t7e 'robe9 :etting t7e eart7 aro#nd t7e 'robe9 or driving $ore t7an one 'robe and connecting t7e$ in 'arae are $et7ods o( getting t7e necessar8 eart7 contact in 'robe$ sois. 5B 5oo: t7e 2% ead bac4 and $ar4 t7e :ire or dro' ot7er 'robes at t7e distances :7ere t7e ot7er 2% 'robe test readings are to be ta4en. A ta'e $eas#re s7o#d be #sed to deter$ine t7e distance bet:een 'robe 'ace$ents. T7e $ost distant 2% 'robe s7o#d be at a distance greater t7an 'ercent o( t7e C% 'robe distance9 're(erab8 at F 'ercent. T7e nearest 2% 'robe s7o#d be 'aced coser t7an % 'ercent o( t7e C% distance. Note: T7e 2% test 'oints s7o#d be in as straig7t a ine to:ard t7e tester as t7e terrain :i ao:.
4) PRE*+M+NAR? C;ECKS
Be(ore contin#ing9 'ersonne s7o#d $a4e t7e (oo:ing 'rei$inar8 c7ec4s to ass#re a 'ro'er test set#' @a (o: c7art o( t7e Bidde ,ETD% tester o'eration is i#strated in (ig#re %>
Pro7ect: Khabat Thermal Power Plant Un8ts 1!
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1B )it7 21 disconnected and t7e C0!!ENT !ANGE s:itc7 O559 connect bot7 2% and C% 'robe eads
to t7eir res'ective ter$inas on t7e tester. !B 0sing ine$ans goves9 ca$' t7e 21 and C1 tester eads to t7e gro#nd $at riser cabe. =B 2ace t7e TE&T C0!!ENT dia to NO!MAL and 5-LTE! dia to O0T. 4B T#rn t7e !ANGE dia to t7e %Do7$ 'osition. 5B -( t7e -N20T NO-&E ig7t and t7e &2-KE !E&-&TANCE ig7t are o((9 and t7e digita n#$bers are stead8 @not (ic4ering9 t7en t7e test set#' is good. T#rn t7e !ANGE s:itc7 to O55 aB Moisten t7e gro#nd aro#nd t7e re$ote test 'robes. bB !e'osition t7e 'robes sig7t8. cB ,rive one or t:o additiona 'robes and j#$'er (ro$ 'robe to 'robe. DB -( t7e &2-KE !E&-&TANCE ig7t is it9 t7e test c#rrent $#st be red#ced. 6B -( t7e digita reado#t (ic4ers9 t7e 5-LTE! s:itc7 s7o#d be t#rned to t7e -N 'osition. 1B )7en t7e tester indicates t7e set#' is good9 t#rn t7e !ANGE s:itc7 to O55 4)1)
.eterminin& ,ac0&roun% 2olta&es
Meas#re t7e ac and dc bac4gro#nd votages as (oo:s to assess an8 e 1B Leave t7e 21 and C1 eads connected to t7e gro#nd $at9 b#t disconnect t7e$ (ro$ t7e tester @see (ig#re 3. !B CONNECT T*E ACD,C VOLTMETE! BET)EEN T*E C% 2!OBE LEA, AN, T*E C1 LEA,. &ET -T 5O! T*E D TO 1DVOLT AC &CALE.
-i&ure!: A t8'ica set#' at an eectrica s#bstation. 5) RECOR.+N' O- +NSPECT+ON AN. TEST .ATA
T7e res#ts o( t7e c7ec4s and $eas#re$ents $ade d#ring t7e (ied tests s7a be recorded on t7e test (or$s>
