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18IOWASTRAYVOLTAGEGUIDESignatureTestPurposeThistestisusedtodeterminethecontributiontostraycurrentorvoltageoindividualpiecesoequipmentoperatingonthearm.Thetestisbestperormedwhenthereisminimalarmelectricalactivity.DescriptionDuringthistestindividualpiecesomajorcurrentdrawingequipmentarestartedandstopped.Theeectsostartingoperatingandstoppingoequipmentwillbemeasuredandrecordedoraperiodooperationoatleastteen15seconds.Thepersonconductingthetestwillidentiyandrecordtheequipmentbeingtestedandrecordthespecictimesthattheequipmentwasstartedandstopped.Adigitizingdatarecorderisusuallyusedtomeasureandrecordtherequiredelectricaldata.Thesemeasurementsareusuallytakenatthesamelocationsatthedairywheremeasurementsweretakenorthepurposeotheloadboxtestand24-hourtest.SeeAppendixAPage23forasampleform.PrimaryProfleTestPurposeThepurposeothistestistomeasureorcalculateneutral-to-earthvoltageNEVoramulti-groundeddistributionsystem.DescriptionAtestwherenearlysimultaneousreadingsoprimarysystemgroundingcurrentandgroundrodresistancearemade.Thesereadingsaretakenorallgroundedprimarydistributionpolesorthree-ourthsoamileromthearmstransormerpole.FromthisdataandusingOhmsLawaprimaryneutral-to-earthvoltagecanbecalculatedoreachpole.Thisdataisuseulinanalyzingthecharacterandcapabilitiesothedistributionneutralgroundsysteminthevicinityothearm.SeeAppendixAPage24forasampleform.24-HourTestPurposeandDescriptionTheprimarypurposeothe24-houratleasttwomilkingstestistomonitoranimalcontactvoltagelevelsoverapproximatelya24-hourperiodduringnormalarmoperations.Testingshouldbescheduledduringatimethatrefectstheoperatingconditionswhenimpactostrayvoltageissuspected.Forexampleseasonalvariationsinelectricalloadon-armoro-armorchangesingroundresistanceduetosoilmoisturecanimpactmeasureablelevelsostrayvoltage.Thistestistypicallydonebyinstallingarecordingvoltmeterwhichwillcontinuouslyrecordvoltagelevelsorthedurationothetest.Thistestisuseulinmonitoringchangesinvoltageasarmloadfuctuatesduringthetestperiod.Itwillalsohelptodetermineiadditionaltestingisnecessary.Instantaneousspotchecksareinitiallyperormedaroundthearmsteadatanimalcontactpointssuchasstallsandwaterersinordertoidentiytheareaswiththemostsignicantanimalcontactvoltageexposure.Therecordingvoltmeteristheninstalledorabout24hours.TESTINGPROCEDURESDescriptionoPhaseIandPhaseIITestingProceduresIpnIpnIpnIpnIpnIpgIpgIpgIpgMeasureIandRResistenceandcurrentmeterPrimaryProle