Tan Delta Test on 6KV HT Motor

Tan Delta Test on 6KV HT Motor 08/22/2011 9:12 AM

Dear friends, We tested Tan Delta test on a 6 KV HT Motor. We got te follo!ing readings at different "oltages,

Voltage (kV)

UVW Phase (Star Connected)

Tan Delta (%)

CAPACITAC! (n")

#$

#.2

1#0.82

#$&

#.2$

1#0.82

$'

#.##

1#0.98

$

#.%9

1#1.%#

$'

$.62

1##.1%

Motor Details: KW: 2%&KW KV: 6KV Man'f. (ear: 2008 Te tested )art* said tat tese readings indi+ate )artial dis+arge. We dont a"e an* s)are -otor for tis. Kindl* s'ggest tese readings reall* indi+ate serio's artial dis+arge f !e r'n te -otor it !ill fail r it !ill tae long ti-e to fail

Wat are te a+tions to 3e taen for tis 4egister to 4e)l* 2

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nterested in tis to)i+ 5* oining 74$ *o' +an s'3s+ri3e to tis dis+'ssion and re+ei"e notifi+ation !en ne! +o--ents are added. oin 74$, Te ngineers la+e for ;e!s and Dis+'ssion<

Co**ents rated to +e ,al*ost, -ood Ans.ers/ 7e+ o't tese +o--ents tat dont *et a"e eno'g "otes to 3e offi+ial good ans!ers and, if *o' agree !it te-, rate te-< •

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=2 Re: Tan Delta Test on 6KV HT Motor 3* Ton*> on 08/22/2011 9:21 AM ?s+ore 1@ =& Re: Tan Delta Test on 6KV HT Motor 3* rs3ar"e on 08/2#/2011 1:01 AM ?s+ore 1@

Anon*-o's oster =1

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0e/ Tan Delta Test on 6KV HT Motor 08/22/2011 9:1% AM

tt)://en.!ii)edia.org/!ii/Tandeltatest 4egister to 4e)l*

Ton*> =

B'r'

0e/ Tan Delta Test on 6KV HT Motor 08/22/2011 9:21 AM

f *o' dont a"e a s)are !at +oi+e do *o' a"e (o' r'n it and get a s)are sorted 'i+l*. f *o' +an lea"e it s't do!n ten *o'"e all te ti-e in te !orld, 'ntil *o' need it in a 'rr*< ts *o'r +all, its ris assess-ent< oin Date: A'g 2010 Co+ation: 4esting 'nder   essi-ists are rarel* disa))ointed. te Maor a

osts: #6&0

4egister to 4e)l* Score # 1or -ood Ans.er

Bood Ans!ers: 1$#

Bo to ;eEt Al-ost Bood Ans!er

ole!i =

o!erFGser

0e/ Tan Delta Test on 6KV HT Motor oin Date: 'n 2010 Co+ation: 7anada osts: 126 Bood Ans!ers: 6

08/22/2011 10:&9 M

(o' do not )ro"ide s'ffi+ient infor-ation for an*one to )ro"ide *o' !it ad"i+e. (es, te -otor is 3reaing o't serio'sl* into +orona 'st 3elo! te o)erating "oltage. Ho! soon !ill te -otor 3rea do!n F !ill de)end on te ins'lation 'sed in te -otor and on te n'-3er, a-)lit'de and fre'en+* of o"erF"oltages and s'rges a))earing at te ter-inals of te -otor. 4egister to 4e)l*

le"eles ='

B'r'

0e/ Tan Delta Test on 6KV HT Motor oin Date: an 2008 osts: 1%&6 Bood Ans!ers: &9

08/22/2011 11:2$ M

Te s+ar+it* of te eE)lanations allo! t!o )ossi3ilit*. ne is le!is: te -otor r'n long eno'g igl* stressed, and lo! le"el of  +orona dis+arge is eating te ins'lation at te end of its life. Te oter is, tat te -otor !as in storage long eno'g to a3sor3 -oist're in te ins'lation. Tat +an 3e +ooed o't 3* r'nning te -otor !ito't load for a +o')le of da*s, gi"ing a +an+e te -oist're to 3ae o't. 5GT,  a"e a )ro3le- !it te 3asi+ 'estion itself. An* -otor is a "er* loss* +a)a+itor fro- te sili+on iron la-ination alone. Wat is te loss fa+tor in a ne!l* asse-3led -otor Wito't no!ing tat, deterioration F if an* F +an onl* 3e g'essti-ated. ne -ore note. 7orona and oter ins'lation fail're -odes are "oltage tresold de)endent. (o' !ill see te- at iger tan nor-al "oltages. Atte-)ting to -eas're te- at lo! "oltages, as re)orted, is -eaningless. 4egister to 4e)l*

rs3ar"e =2

arti+i)ant

0e/ Tan Delta Test on 6KV HT Motor oin Date: A'g 2011 osts: #

08/2#/2011 1:01 AM

7annot gi"e a s)e+ifi+ ans!er. Ho!e"er , so-e to'gts 3elo!F 1@ Ass'-ing tat te "oltage !as 3et!een line and eart, *o' a"e alread* rea+ed near )ase "oltage #$68V !i+ is liel* to a))en !it earted ne'tral s*ste-. >o less )ro3le- in anal*sis and also !it te -otor if it is te +ase. 2@ Tae eart< Does not a))ear too 3ad as "ario's fa+tors are in"ol"ed in diagnosis. ne of te- is te ins'lation s*ste- 'sed. lder s*ste-s a"e iger tan delta on !i+ 7 allo!ed a))roE.$.&  at rated "oltage. le"i I le"les are rigt and *o' so'ld a"e re)ort of +ondition on ne! -otor for 3etter 'nderstanding.ter!ise, +e+ te s*ste- 'sed and res'lts of sa-e -ae fro- sa-e -an'fa+t'rer. #@ Te ti) ') of +'rrent is not 3ad.Te* -'st a"e sto))ed f'rter testing d'e to li-itation on 3ridge to a"e -ore tan 1&0/200 -A +'rrent. f te readings at rated "oltage do not soot '), tere is less )ro3a3ilit* of +atastro)i+ fail're. $@Also ti) ') of tan delta 3et!een 20  I a))roE 60  rated "oltage is not too 3ad +onsidering tat *o' +annot test a +o-)lete -otor !it g'ard rings at te ends of ea+ +oil. Most )ro3a3l*, te -an'fa+t'rer -'st a"e 'sed a stress grading ta)e at te end of te +oils !i+ in+rease ti) '). &@ 7leaner and dr* 0"erang +an i-)ro"e tan delta if te !indings are fo'nd +onta-inated !it +ond'+ting d'st. )l ee) )osted if f'rter in"estigations and a+tions taen regards 4egister to 4e)l* Score # 1or -ood Ans.er ;o -ore Al-ost Bood Ans!ers.

MMK'-ar =6 n re)l* to =&

A+ti"e 7ontri3'tor

oin Date: 'n 2011

0e/ Tan Delta Test on 6KV HT Motor 08/2#/2011 6:1& AM

osts: 1#

indl* gi"e details o! do ' anal*sis te tan delta res'lts. 4egister to 4e)l*

A4G; DB4A =3 n re)l* to =6

arti+i)ant

oin Date: >e) 2011

0e/ Tan Delta Test on 6KV HT Motor 09/1&/2011 &:0& AM

osts: #

A> (G K;W TH TA; DCTA T>T AC> 7ACCD C>> A;BC 4 D>>AT; JA7T4 T>T;B , > A DAB;>T7 MTHD J T>T;B MT4 W;D;B> ;>GCAT; GACT(. J TH ;>GCAT; > BD, J4 J4M DJ7T> CK WAT4 T4, C7T47AC T4, M>TG4 A;D A4 7KT> T7 TH W;D;B A4A7H> TH 44T( J A 4J7T 7AA7T4. J TH4 A4 MG4T> ; TH ;>GCAT;, TH 4>>TA;7 J ;>GCAT; D74A>>, 4>GCT;B TH ;74A> ; 4>>TV 7G44;T TH4GBH TH ;>GCAT;. TH 7G44;T A;D VCTAB WCC ; C;B4 5 90 DB4 GT J HA> A;D TH DJJ4;7 ; GT J HA> ?J4M J7T >T; J 90 DB4@ > TH ;D7ATV CVC J ;>GCAT; 7;TAM;AT;/DT4AT;. TH> > 7ACCD TA; DCTA. A;AC(>> J 4AD;B> TH 4AD;B> >HACC 5 A;AC(>D ; 4J4;7 T TH MA;GJA7TG44 4>GCT>/D>B; 4>GCT>. TH ;74A>;B T4;D W.4.T ;74A>;B T>T VCTAB A;D 5( ABA;B BV> TH ;D7AT; J JGTG4 JACG4. ;4MAC( TH VACG >HGCD 5 5CW .0# 4ADA; ?#@ HWV4 TH ;T44TAT; >HACC 5 7;7CGDD ; 7H7K;B D,, DCTA 7 , D7 CAKAB 7G44;T I >G4B T>T AC>. 4BA4D> AKD

mohanlal  (Electrical) (OP) 9 Jan 06 06:18  The generator / motor winding power factor or tan delta test was carried ot for the !"! #$ e%ipments" The generator ratings are 8"0 &'  motor ratings are from 1* #' to 1600 #'"  The test referred to as Tip+p test is performed at a nm,er of le-els of -oltage from .* to 100 of line to grond -oltage to o,tain the P -s -oltage chs" P Tip p -ale is dened as the di2erence ,etween the P measred at the line to grond -oltage and the P measrred at teh lowest -oltage in the test range (sall3 .* of the line to grond -oltage")  The do,le s3stem incldes online 4T5 epert condition e-alation software7which e-alates and rates the dielectric condition of the inslation tested from the test reslts ,3 comparison against the limits of P of relia,le  winding inslation of nits of identical mae7 t3pe7 and ratings with the nit tetsed as well as against pre-ios test

records of the nit where a-aila,le" n sch test one of the generator is ha-ing  P of a-erage 6 for phase to grond and !  for phase to phase" f the inslation is epo3+mica7 then the  pf is high and indicates possi,le deterioration" ecommended  to test it again within net three months to monitor the trending" ;ow the e%ipment is on line" oin in this %estion form"  Thans7 ?,ramanian

RE: Generator / Motor winding Tan-Delta (PF) test motorspert  (Electrical)  9 Jan 06 0:@9 5t !!00$ we wold not recommend Tan delta testing" the coils wonAt ha-e corona sheields7 so th e earting is dodg3 and readings wold ,e nrelia,le" 5lso7 at sch low phase -oltages th ere wold not ,e an3 discharges within the coils" 'e onl3 test at @*00$ and a,o-e e-en at @*00$ teh -ale of the test is de,ata,le" B3 all means repeat in three months + ,t as the compan3 or persons who are doing the tests for 3o to >stif3 wh3 3o need them"

RE: Generator / Motor winding Tan-Delta (PF) test edison123 (Electrical) 9 Jan 06 ..:*  agree with motorpsert" CCC .86 states that P and tan delta is sefl for 6 #$ and a,o-e" !"! #$ motors do not ha-e stress grading and anti corona s3stems since the partial discharges start at o-er 6 #$" D Eomer 'isdom + FOperator7 Gi-e me the nm,er for 911F D

RE: Generator / Motor winding Tan-Delta (PF) test vmere (Electrical)  10 Jan 06 06:*0  T5;/4CHT5 testing of transformers  motors" 'e ha-e !0m-a transformers with open air 1!.- h- ,shing" i re%ire information/eplanation on how to do th is test  wh3 is re%ired" 'hat are epected -ales from tests" 4oes this gi-e one a foot print of the inslation of ,shing/winding7 etc=