AEMC DTR 8510 - Vt;Pt Continuity Test; Ct Test

Digital Transformer Ratiometer DTR
®
Model 8510 33
5.2.4 VT/PT Continuity Test
TheContinuityTestfunctionoftheDTR
®
8510servesasausefulmeans
ofidentifyingopenprimaryandsecondarywindings,highresistancecon-
nections,opencircuitbreakersandblownfuses.Whenselected,theDTR
®
8510 checks for continuity between its Secondary (X) and Primary (H)
cables.
• TheDTR
®
8510willindicateOPENforcircuits>4KΩand
CONTforcircuits<4KΩ.Checkthesevalues.Asmallfraction
oftransformers(HighinductanceorhighwindingOhmicDC
resistance)mayappearopen.
• TheinstrumentchecksforSecondary(X)connectionsrst.Even
ifitisfoundopen,itcontinuestocheckPrimary(H)connections.
Regardlessoftheoutcome,theinstrumentproceedstoperform
pre-testchecks.Followingthepre-testchecks,ifeitherXorH
orbothwerefoundtobeOPEN,theinstrumentwilldisplaythe
appropriateerrormessage.PressingtheTESTbuttonagain
willstartanewContinuitytest(assumingtheuserxedthe
connectionproblem)again.IfitpassestheContinuitytest,Ratio
testwillbeexecuted.
• Transformerswithwindingarrangementmultiple,parallelpaths
(e.g.,Deltatype)mayreadCONTevenifoneormorewindings
maybeOPEN.
5.2.5 CT Test
Inthissection,anexampleofrunningatestusingthefollowingcongura-
tion(see§4.3forhowtoconfiguretheinstrument)isshown:
• SetDate/Time:July4,2010.6:00PM
• SetvaluesinNameplate:
PrimaryCurrent:19920;SecondaryCurrent:7200
• SelectType:CT
• Select Test Mode: Ratio
• StorageMode:Manual
• Set Filter: Normal
• SetLanguage:English
Note: CTtestdoesnotallowaCONT/Ratiooption.ItonlyrunsaRatiotest.
WARNING: The DTR
®
Model 8510 is designed for use on de-energized
(“dead”) transformers only. Make sure the test sample is completely
disconnected from AC power and is fully discharged.
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