|
|
|
|
|
|
|
| |||||||
isperformedwithhighvoltage | lectrcalpower.Followsafetyregu- | |||||||||||||
WARNING:High−Potential(Hi−Pot)t |
| |||||||||||||
lationsandlocalpracticesforhighvoltaesting | sing.Failuretodosomay | sultininjuryordeath. |
|
| ||||||||||
Hi−Pottestsevaluatetheinsulationdilectricstrength(ability | insulate)ofthemotorinsulationsystems.High | |||||||||||||
CAUTION:voltageAlwaysisapperfopliedtoeachthe | motorphastotesttestbeforeinsulationHi−Potgroundtest.Damageduringthemay | ccur.Toperformto | theHiduring−Pottest: | |||||||||||
damagetothestatorwindingsMegohmmeterrequiringplacemtofthestator. |
|
|
|
|
| |||||||||
Hi−Pottestingifmoistureordebrisispresentinthecoilsofthe | .Failuretodotestomayresultinsulationpermanent | |||||||||||||
1GroundoneleadoftheRTD |
| sensorforsensorprtection.DonotHi−Pot | RTD | uringtesting. | ||||||||||
2. | Apply |
| specifiedhigh |
| temperature60Hztoachmotorleadfooneminutewiththeotherlead | ftheHi−Pot | ||||||||
| connectdthe | to | .Thre | notbeanysignificantcurrent(amperage)leakagetogroundduring | ||||||||||
| testinga | .TheNewvltageogroundrecoiledapplidvoltageshould− plybe:350VACrms. |
|
|
|
|
|
| ||||||
| b. |
| Reconditioned | stator−apply2500VACrms. |
|
|
|
|
|
| ||||
3. | c.In−serviceorusedstator−apply2250VACrms. |
|
| asdescribedinsection | ||||||||||
Ifthestatorwindingsshowsignificantcurrentleakageogroud,cleanthe | ||||||||||||||
| 5.4.1.SteamCleaningIntroductioninthispublication.Afertcleaning,retestthestaatort | windings. | ||||||||||||
5.6.1.RTheoutDynamicotorOTOR−serotorofinstructionsBalancing−ballanceSUBASSEMBLYmustberotorofpertainbalancedthewillPROCEDURESrotorleadonlytoassemblytotowitinthecompletelocation50isgramrequiredmotorand−in.metodfilureatforTherefore,bothsmooth.ofendsattachingoperationofthetherotorandbalance.lowvibrationweights..TheIfnotsetcorrected,−up,specifiedfixturan | |||||||
|
|
|
|
| |||
| tohold | balancemachine, | theproceduresrequirdtoobtainabalancewithin |
| |||
|
| ||||||
| machinelimitscomponentsdepusndent.onthetypeofbalancemachine. | follow | proceduresforthebalance | ||||
CAUTION:UseONLYthespecifiedweldingrod.Useofothertypesmayresultoperatingpooreldsleadingtomotor | |||||||
failureNOT. | E:Kepweldsplatteroutoftherotorcoreventholeswh | welding | weightstotheendplate. | ||||
| Attachth | balanceweightsasneededbyweldingtotherotorendplates | balancetdiameterof13.75in.(276,9mm). | ||||
30 | UseweldingrodGESpec.G50E37,BRONZE(AWS−E−Cu−Sn−C).WeldthebalanceweightsusingGEweldprocess | ||||||
P8B−EP35. |
|
|
|
|
| ||