R/VThomasG.ThompsonVoltageNotchingIssueUpdate

DougRussellUWMgrofMarineOps

18Dec2018

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Timeline•  Dec2017–Mid-liferefit&repoweringcomplete•  Feb2018–transittoAuckland,NZ•  Mar2018–

–  Firstcruise,JASONonboard–electricalproblemswithJASONsystems–  OnloaddeckgeneratortoprovidededicatedpowertoJASON–  Ockermanreponboardforassessingpowerquality

•  Apr2018–Vigorsummaryofissues–  RecommendinstallaSonof15tunedlinefilters(“lineators”)

•  June2018– OckermanPowerQualityReport•  Aug2018–installed5lineatorsduringKaohsiungportcallNov2018

–  hadtouseaportablegeneratorondeckagainforSikescruise–  Dynaconwinchcouldn’tworkwithlineatorL-13-toomuchvoltagedrop

•  June2019–planningforinstallofremaininglineators

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ProblemsencounteredduringtransittoNZ&BrothersVolcanoCruise

•  ScienceUPSunusualbehaviors•  Coffeemakercontrolboard120v•  UVSterilizerboards120v(atpowerinputtomainctrlcircuitboard)•  Weldingmachine480v•  ElevatorPowersupply480v•  ROWatermakerDumpsolenoidcoil•  AcDeckHalogenlighttransformer120v•  JASONaircondiSonercontroller(sourcedfrom480)•  JASONwinchsolenoidcoilforbrake(reported)(sourcedfrom480)•  WinchroomFanmotor(480v)

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OckermanAssessment•  TheharmonicdistorSonmeasuredonthevesselundervaryingcondiSonsduring

seatrialsandonthelatestsciencemissionindicatesrelaSvelylow%Vthdatthe480Vshipservicebus.

•  ThenotchesmeasuredintheahachedwaveformIMG_2382.jpgarethemostlikelysourceofpowerqualityrelatedequipmentproblems.ThenotchesaresensedbytheharmonicmeasurementequipmentbutonlyinaveryhighfrequencyrangeandaddjustaliIlebittoatotalharmonicdistorJon.Bytheirnaturethenotchesarenotharmonics,theyaretransients,However,theyarerepeaSngtransients.Inthisregard,theahachedoriginalspecS03-RepowerPerformanceSpecifica=onRevB.pdfrequiresvoltagetransienttolerancesof+/-16%withrecoverySmeof2seconds.Themeasuredtransientsappeartobewithinthisspec.

•  ThenotchesobservedarenotunusualandtypicalwithanSCRdrivesystemthustheneedforaseparatecleanpowersourceforsensiJveconsumers.

•  BaseduponreviewoftheP614,P615loads,thereareanumberofdifferentconsumerswhichmostlikelyinteractwitheachother.Forinstance,theROV3phaseelectronicpowerconvertersandVFDswilllikelygeneratesomeelectricalnoise.NoSceablesensiSveloadsarethetoolvanloadswhicharesuppliedthrougha30AbreakerwithtypicaloperaSngcurrentsof10A.Everythingelse,HPU,VFDs,socstarters,etc.shouldcopeunlesstheyareinteracSngwitheachother.Ifso,thisshouldbetakencareofbytheirsuppliers.Alloftheseloadsaresupposedtobedesignedformarineenvironmentandbeproperlyprotected.Again,theonlysensiSveloadsonthelistarethevantoolswhichcouldbeprotectedwithseparatesmallfilters.

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VoltageNotching

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OckermanonVoltageNotching•  DCdrivestechnologyiswellknownandunderstood.Theyarevery

simpleandreliable.DCdrivescreateharmonicdistorSoninthepowersystem.HarmonicmiSgaSonisalwaysrequiredinthesystemswithlargeDCdrives.OneofthemaindisadvantagesofDCdrivesisanotchphenomenon.ThenatureofthisphenomenonisconnectedtothyristorcommutaJonwhenonethyristorinonephaseisopeningbutanotherthyristorinadifferentphaseisnotclosedyet.Theseverityofthenotchproblemsdependsonthesystemparametersanditisverydifficulttoreliablyevaluateitinadvance.Inmostofthecases,standardelectricalequipmenttoleratesnotcheswellexceptwhenthenotchesarereallydeepandtheycreateaddiSonalzerocrossingsinvoltagewaveform.InthiscasesomeelectronicequipmentmightmalfuncSon.

•  ItisimportanttoemphasizethatDCdriveharmonicsandnotcheshavedifferentnatureandphysicallyaredifferentphenomena.

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LineatorDetailsSpecificLocation

LineatorNo. Priority Circuit LoadDescription BreakerTrip

Rating FLA Voltage Freq LineatorInputARating Weight Dimensions Suggestion

L1-A Med P413-1 StagingBayReceptacle 60A 48A 480V 60HZ 57A 186LBS 29.5"Hx13.25"Wx12.75"D ScienceHold,Location7

L1-B Med P413-11 MainDeck-PortReceptacle/JasonVan 60A 48A 480V 60HZ 57A 186LBS 29.5"Hx13.25"Wx12.75"D ScienceHold,Location7

L2 High P414 PortPortableDeckCraneReceptacle 80A 64A 480V 60HZ 69A 218LBS 34"Hx20.25"Wx16"D SCRRm,Location1

L3 VeryHigh P415 StbdPortableDeckCraneReceptacle

80A 64A 480V 60HZ 69A 218LBS 34"Hx20.25"Wx16"D SCRRm,Location1

L4 High P419-7 BowThrusterRmPowerPanel 40A 32A 480V 60HZ 34A 142LBS 29.5"Hx13.25"Wx12.75"D BowThrusterRm.Location3

L5 P423-9 HVACPanelP423 15A 12A 480V 60HZ 12A 78LBS 23.5"Hx11.25"Wx11.25"D UpperEngineRm.Aft,Location4L6 High P423-11 15A 12A 480V 12A 78LBS 23.5"Hx11.25"Wx11.25"D UpperEngineRm.Aft,Location4L7 High P423-12 15A 12A 480V 12A 78LBS 23.5"Hx11.25"Wx11.25"D UpperEngineRm.Aft,Location4

L8 P426 WorkshopPowerPanel 150A 120A 480V 60HZ 141A 345LBS 34"Hx20.25"Wx16"D ScienceHold,Location5

L9 Med P430 CleanPowerStbdBusTie 320A 240A 480V 60HZ 281A 578LBS 45"Hx26"Wx25"D ScienceHold,Location5

L10 Low P418-5 Pauluhn Plug 25A 20A 480V 60HZ 23A 118LBS 29.5"Hx13.25"Wx12.75"D Location6,GalleyPlenum

L11 Low P420a 120Vtransformer 113A 90A 480V 60HZ 113A 323LBS 34"Hx20.25"Wx16"D

L12 VeryHigh T3-CB1** AftDeckSciencePower 400A 320A 480V 60HZ 337A 585LBS 45"Hx26"Wx25"D WinchRoomStbd,Location2L13 VeryHigh T4-CB1* AftDeckSciencePower 200A 160A 480V 60HZ 169A 365LBS 40"Hx22"Wx23"D WinchRoomStbd,Location2L14 VeryHigh T4-CB2* AftDeckSciencePower 100A 80A 480V 60HZ 85A 304LBS 34"Hx20.25"Wx16"D WinchRoomStbd,Location2

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LineatorList•  12A,480V,3PH,60HZ–L5,L6,L7–EngineRoom•  23A,480V,3PH,60HZ–L10-GalleyPlenum•  34A,480V,3PH,60HZ–L4-BowThrusterSpace•  57A,480V,3PH,60HZ–L1A,L1B-ScienceHold•  69A,480V,3PH,60HZ–L2,L3-AcBos’nLocker&TrawlWinch

Space

•  85A,480V,3PH,60HZ–L14-TrawlWinchSpace•  113A,480V,3PH,60HZ–L11-GalleyPlenum•  141A,480V,3PH,60HZ–L8-ScienceHold•  169A,480V,3PH,60HZ–L13-TrawlWinchspace•  281A,480V,3PH,60HZ–L9-ScienceHold•  337A,480V,3PH,60HZ–L12-TrawlWinchSpace

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Green–InstallSummer2019Red–Installed&OperaSngBlue–Re-evaluaSng

WinchRoomLineators

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SummaryofResultsfromFirst5LineatorsInstalled

•  AteachofthelineatorslocaSonsandundereachtestcondiSon,thevoltagewaveformsshowsignificantimprovementinreducednotchdepthandmeasuredharmonicdistorSon.

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Outcomes/Future

•  5circuitsnowimproved•  6lineatorstobeinstalledJune2019•  Willdevelopguidance/specificaSonsforscienceparSesbringingelectricalgearonboard

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