integrated transmission plan glossary - · pdf filethe flow of electric current from line to...
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GlossaryINTEGRATED TRANSMISSION PLAN
SEPTEMBER 2017
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2017IntegratedTransmissionPlanGlossary 1
GLOSSARY Term Description
AC Alternatingcurrent
ACM Asbestoscontainingmaterials
assethealthandassethealthindex(AHI)
Assethealthisexpressedusinganassethealthindex(AHI)
AHIisamodellingmethodthatestimatestheremainingusefullifeforassets.Ittakesintoaccountarangeoffactorssuchasassetcondition,failurerate,andenvironmentalfactors,dependingontheassetclass
automaticunder-frequencyloadshedding(AUFLS)
Theautomaticdisconnectionofcustomersforsevereorprolongedunderfrequencyexcursion
availability Thenumberofhoursperyearthenetworkorpartofthenetworkisinservice
bus Thecommonprimaryconductorofpowerfromapowersourcetotwoormoreseparatecircuits
cable Oneormoreinsulatedconductorsformingatransmissioncircuitaboveorbelowground
capacitorbankAnumberofcapacitorsconnectedtogetherinaseriesorparalleltoformtherequisitecapacitanceandvoltageratingforreactivecompensationandharmonicfiltersonthepowersystem
capex Capitalexpenditure
CapexIM TranspowerCapitalExpenditureInputMethodologies
circuit
Asetofconductors(usuallythree)plusassociatedhardwareandinsulationonatransmissionline,whichtogetherformasingleelectricalconnectionbetweentwoormorestationsandwhich,whenfaulted,isremovedautomaticallyfromthesystem(bycircuitbreakers)asasingleentity
circuitbreakerAswitchingdevice,capableofmaking,carryingandbreakingcurrentsundernormalcircuitconditionsandalsomaking,carryingforaspecifiedtimeandbreakingcurrentsunderspecifiedabnormalconditions,suchasthoseofshortcircuit
commissioned Theoperationalstateofequipmentthathasundergonethecommissioningprocessandisbroughtundertheoperationalcontrolofaservicecentre/controller
constraint Alocallimitationinthetransmissioncapacityofthegridrequiredtomaintaingridsecurityorpowerquality
contingency
Aneventthatcanoccuronthepowersystem.Forexample,asinglecontingencycouldbe:
• inrelationtotransmission,theunplannedtrippingofasingleitemofequipment
• inrelationtoafallinfrequency,thelossofthelargestsingleblockofgenerationinservice,orthelossofoneHVDCpole.
controlleddocumentAtechnical,safetyorcompliancedocumentregisteredwithintheTranspowersystem.Weissue,amendandwithdrawacontrolleddocumentthroughaformalqualityprocesssystem
coregrid ThemainelementsofthetransmissiongridasdefinedinSchedule12.3oftheElectricityIndustryParticipationCode2010
criticality
Weuseanassetcriticalityframeworktoestimatetheconsequencesoffailureforeachasset.ThisframeworkapproachisnewtoTranspower,andisstillunderdevelopment.Wearedevelopingthisframeworktocoverarangeofdimensionsofconsequence.Itcurrentlyincludesserviceperformanceandpublicsafety
earthpotentialrise(EPR) Thepotential(difference)betweenthelocalearthandtheearthataremotepointduetotheflowofelectriccurrentfromlinetoearthingsystemtoearth
E&D Enhancementanddevelopment
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2017IntegratedTransmissionPlanGlossary 2
Term Descriptionelectricitydistributionbusiness(EDB)
Anassetownerwhoseassetsarepredominantlyforthedistributionofelectricitytocustomers
ElectricityIndustryParticipationCode
AstatutoryinstrumentsettingouttherequirementsontheelectricityindustrypursuanttotheElectricityIndustryAct2010
feeder Acircuitthatprovidesadirectconnectiontoacustomer
FMIS Financialmanagementinformationsystem
forcedoutage Theautomaticorurgentremovalfromserviceofanitemofequipment
frequency Therateofcyclicchangeinvalueofcurrentandvoltage,quantifiedbytheinternationalstandardterm‘Hertz’(Hz)
gasinsulatedswitchgear(GIS)
Metal-enclosedswitchgearinwhichtheinsulationandarcextinctionisobtainedbyaninsulatinggas,usuallySF6
GOM GridOperatingModel
grid ThepartoftheNewZealandelectricitytransmissionsystemthatisoperatedbyTranspower
gridexitpoints(GXP) Apointofconnectionwhereelectricitymayflowoutofthegrid
gridinjectionpoints(GIP) Apointofconnectionwhereelectricitymayflowintothegrid
gridmetermanagementsystem(GMMS) Ameteringdatarepositoryanddatamanagementsystem
high-voltage(HV) Unlessotherwisenoted,HVgenerallymeansabove66kV
HVAC Highvoltagealternatingcurrent
HVDC Highvoltagedirectcurrent
hypoxicairfiresuppression
Anactivefireprotectiontechniquebasedonapermanentreductionoftheoxygenconcentrationintheprotectedrooms(alsoknownasoxygenreductionsystem)
ICT InformationandCommunicationsTechnology
intelligentelectronicdevice(IED)
Adevicethatperformselectricalprotectionfunctions,advancedlocalcontrolintelligence,hastheabilitytomonitorprocessesandcancommunicatedirectlytoaSCADAsystem
integratedoutagenotificationsystem(IONS) Asystemwhichhelpsschedule,coordinateandtrackgridoutages
IntegratedWorksPlan(IWP) Ourworksplanwhichincludescapexandopexwork
ISO55000 ApublicallyavailableinternationalstandardforassetmanagementdevelopedandpublishedbytheInternationalOrganisationforStandardisation
livelineworkWorkperformedonornearnormallyenergisedtransmissioncircuitcomponents,withoutusingisolatingandearthingprocedures,andatdistancescloserthantheminimumapproachdistancesspecifiedinSR-EIRule703
Maximo Ourcoreassetmanagementinformationsystemforallgridasseswhichholdsouroperationalassetregisterandisourmaintenancemanagementtool
medium-voltage(MV) Unlessotherwisenoted,medium-voltagegenerallymeansbelow66kV
NGOC OurtwoNationalGridOperatingCentresinAucklandandChristchurch
N,N-1 ReferstotheplanningstandardthatTranspowergenerallyplansthegridto.
TheN-1securitylevelprovidessupplysecuritytotheconnectedloadsunderasinglecrediblecontingencywithalltheassetsthatcanreasonablybeexpectedinservice.AnNsecuritylevelmeansthattheoutageofoneormoreassetswillinterruptload.Itisoftenfoundinsmallersupplyareas,wherejustonetransmissioncircuitorsupplytransformerprovidessupply
networkstudiesSimulationoftheactualpowersystemusingcomputermodels,toanalysetheeffectsofchangestoinputs(likedemand,supply,andassetratings),andidentifyconstraintsorotherissuesthatmightaffectsecurityofsupplytoaregion
opex Operationalexpenditure
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2017IntegratedTransmissionPlanGlossary 3
Term Description
outage Thestateofanitemofequipmentwhenitisnotavailabletoperformitsintendedfunction.Anoutagemayormaynotcauseaninterruptionofsupplytocustomers
PAS55
Apubliclyavailablespecification(PAS),publishedbytheBritishStandardsInstitutethatspecifiestherequirementsfororganisationsseekingtodemonstrategoodassetmanagementpractices.ThisspecificationhassubsequentlybeensupersededbytheISO55000assetmanagementstandard
plannedoutage Adeliberateoutagescheduledformaintenancepurposes
point-of-service Anormallycontiguouselectricalbusbarataparticularvoltageatwhichwehaveagreedtoprovideservicestooneormoretransmissioncustomers
powertransformer Atransformerthatprimarilychangesvoltageandcurrentfortheefficientconveyanceofelectricityoverthecircuitsconnectedtoit
primaryassets Powersystemequipmentoperatingatahighvoltagethatformspartofthegrid.Examplesofprimaryassetsarecircuitbreakersandtransformers
RCP2andRCP3 Thefive-yearregulatorycontrolperiods.RCP2runsfrom1July2015;RCP3beginson1July2020.
reactivepower
Energythatflowsinthepowersystembetweenalternators,capacitors,SVCs,etc,andinductiveandcapacitiveequipmentsuchastransmissionlinesandlowpowerfactorloads.Itistheproductofthevoltageandout-of-phasecomponentsofthealternatingcurrentandismeasuredinvars
relayAdevicedesignedtoproducepredeterminedchangesinoneormoreelectricaloutputcircuits,whencertainconditionsarefulfilledintheelectricalinputcircuitscontrollingthedevice
RIT RegulatedInvestmentTest
R&R Replacementandrefurbishment
SA Secondaryassets
SCADA Supervisorycontrolanddataacquisitionsystem
SMP Standardmaintenanceprocedure
SVC Staticvarcompensator
switchgear Acollectivetermforswitchesofalltypesandtheirassociatedequipment,includingcircuitbreakers,disconnectorsandearthingswitches
synchronouscondenser Asynchronousmachinerunningwithoutmechanicalloadandsupplyoradsorbingreactivepowertoregulatelocalvoltage
TEES TranspowerEnterpriseEstimationSystem,acostestimationsoftware
TL TransmissionLines
transformerAstaticelectricdeviceconsistingofawindingortwoormorecoupledwindingswhichtransferpowerbetweencircuitsofthesamefrequency,usuallywithchangedvaluesofvoltageandcurrent
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