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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
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Title3 Subtitle
VT TEST PROCEDURE
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Pro7ect: Khabat Thermal Power Plant Units 1!
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SUMMAR<
1) !) =) 4) 5) ?) ;) ;)1) ;)!) @) 6) 1) 11)
PURPOSE O- TESTS RE-ERENCE .OCUMENT SCOPE TERM+NO*O'< TEST E>U+PMENT UN.ER TEST TEST E>U+PMENT RE>U+RE. 'ENERA* +NSPECT+ON MECAN+CA* CECKS E*ECTR+CA* CECKS +NSU*AT+ON RES+STANCE TEST PO*AR+T< TEST TRANS-ORMER TURNS RAT+O TEST RECOR.+N' O- +NSPECT+ON AN. TEST .ATA
= = = = = = 4 4 4 4 ? ? ;
Pro7ect: Khabat Thermal Power Plant Units 1!
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1) PURPOSE O- TESTS
Check conformity with specifications. Check for satisfactory condition prior to energiing. !) RE-ERENCE .OCUMENT
E!ectrica! drawing N" =) SCOPE
A!! Vo!tage #ransformers at MV switchyard 4) TERM+NO*O'<
No app!ica$!e. 5) TEST E>U+PMENT UN.ER TEST
#he concerned e%&ipments are a!! types of potentia! transformers ?) TEST E>U+PMENT RE>U+RE.
' () po!arity test set or* if not a+ai!a$!e* storage $attery* mi!!iammeter* and switch ' Megohmmeter* ,-- V ' , kV ' hmmeter ' M&!timeter /+o!ts* amperes* ohms* etc...0 ' A&to transformer ' )tep'&p transformer
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Pro7ect: Khabat Thermal Power Plant Units 1!
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;) 'ENERA* +NSPECT+ON ;)1)
MECAN+CA* CECKS
' Genera! +is&a! inspection and comp!iance with drawings and man&a!s ' Check namep!ate ratings and 1V and LV termina! markings ' Check that a!! parts of the transformer are proper!y assem$!ed and tight ' Check the 1V connections for !ooseness* stressed termina!s and poor gro&nding ' Check the ca$!e connections on the LV side and the markings ' Check the oi! !e+e!s and inspect for !eakage /where app!ica$!e0 23 Capacitor di+ider type Check that a!! parts of the transformer are proper!y assem$!ed and tight
Capacitors together
Capacitors and meas&ring set
43 E!ectromagnetic type Check the intermediate connections ;)!)
E*ECTR+CA* CECKS
' Check the e%&ipment gro&nding /contin&ity and connections0 ' Check the f&se ratings ' 5erform the operation descri$ed in the fo!!owing pages @) +NSU*AT+ON RES+STANCE TEST
#o o$tain +a!&es as c!ose as possi$!e to the man&fact&rer6s specifications* the ins&!ators m&st $e +ery c!ean. )e!ect the Megger range corresponding to the ratings of the e%&ipment &nder test 7 LV7 8 to 2-- +o!ts /direct c&rrent0 MV7 2-- to 2--- +o!ts /direct c&rrent0 1V7 2--- to ,--- +o!ts /direct c&rrent0
Pro7ect: Khabat Thermal Power Plant Units 1!
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#he theoretica! +a!&es are f&rnished $y the man&fact&rer.
Meas&rements $etween primary and secondary
Meas&rements $etween primary and gro&nd
Meas&rement $etween secondaries and $etween secondary and gro&nd
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Pro7ect: Khabat Thermal Power Plant Units 1!
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6) PO*AR+T< TEST
#he po!arity is checked &sing the kick method /app!ication of direct c&rrent0 and check of def!ection on a $idirectiona! mi!!iammeter. #his test is a!so &sed to check primary and secondary circ&it contin&ity. ' 9hen switch K is c!osed* the mi!!iammeter pointer def!ects &psca!e. ' 9hen the circ&it is opened* the mi!!iammeter pointer def!ects in the negati+e direction.
1) TRANS-ORMER TURNS RAT+O TEST
A +aria$!e AC so&rce is app!ied on the primary side. #he primary and secondary +o!tages are meas&red to determine the ratio V4 3 V2.
Pro7ect: Khabat Thermal Power Plant Units 1!
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+SSUE .ATE 15868!15
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C5C 2-- :isp!ay 11) RECOR.+N' O- +NSPECT+ON AN. TEST .ATA
#he res&!ts of the checks and meas&rements made d&ring the fie!d tests sha!! $e recorded on the test forms7
