Comprehensive_Transformer_Monitoring
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Comprehensive Asset MonitoringComprehensive Asset MonitoringAgenda• Why Asset Monitoring is Important on transformer example • Correlated analysis of monitored Parameters • Examples of Transformer monitored Parameters– DGA – UHF PD – Temperature – OLTC – Bushings• GIS PD monitoring Overview2Comprehensive Asset MonitoringAgenda• Why Asset Monitoring is Important on transformer example • Correlated Analysis of monitored Parameters • Examples of Transformer monitored Parameters– DGA – UHF PD – Temperature – OLTC – Bushings• GIS PD monitoring Overview3Why Asset Monitoring?Why Asset Monitoring is Important• Loss of a electrical asset like a transformer in a utility, generation plant or process can cost many millions of dollars• Help operators to manage their assets and make decisions on continuing operation, maintenance or replacement• Prevent catastrophic failures and convert them into failures that will be repaired at a reduced cost during a planned outage.4Why Asset Monitoring?DECREAS EINCREASECurrent Industry TrendsTransformer Utilization Rates • Higher transformer loading • Need to extend useful asset life • Higher performance expectationsMaintenance Costs • Higher crew costs • Increased safety regulations • Aging asset infrastructureOperation and Maintenance Budgets • Fewer resources • Limited time constraintsIndustry Expertise • Retirement of industry veterans • Loss of key asset knowledgeNeed for Condition Based Monitoring• Extension of useful asset life • Constant window on asset health • Avoid unnecessary maintenance • Automated data collectionCBM is a proactive approach to asset maintenance5Why Asset Monitoring?Additional Benefits of CBMOnline monitoring may defer asset replacement and extend the useful lifeFailure %Infant MortalitySteady StateEnd of LifeAcceptable Level Of Failure RateYearsReplacement DeferralWithout MonitoringWith MonitoringCBM monitoring has been proven to extend useful asset lifeIEEE Std. C57.143-20126Comprehensive Asset MonitoringAgenda• Why Asset Monitoring is Important on transformer example • Correlated analysis of monitored Parameters • Examples of Transformer monitored Parameters– DGA – UHF PD – Temperature – OLTC – Bushings• GIS PD monitoring Overview7Challenges associated with the MonitoringManaging large amounts of monitoring data– Separating the important information – Correlate data from different sources – Maintaining data security – Easy-to-use human interfacePoor MaintenanceDecisionsMore Monitoring ParametersMany Vendors- DifferentMonitoring SystemOverall health assessment– Co-relative analysis of parameters – Risk Index for Transformers – Building an accurate knowledgePoor Health Assessmentof TransformerDifficulty in interpretationScattered / UnorganisedDataNo integrated informationdatabase8Solution to the Challenges• Fast • Reliable • Real-timeCollect Accurate DataCombine Captured Data• All information required to assess the condition of the Asset• Prioritise, organise data• Multi client concurrent access• State of the art analysis and interpretation• Correlate analysed data -> SEVERITY ANALYSIS• Substation automation using IEC 61850Assess overall Asset HealthPresent information intelligently• User friendly interface• Combined input alarming• Intelligent report generator• Training Tool9Structure of correlative Analytics (Transformer)SensorsUHF PD Sensors DGATemperature sensors Wining Temp (fibre) Oil Level IndicatorFlow Indicator Pressure Gauges Bushing SensorsMonitors609 PDM Serveron TM8 ITM 509 series Bushing MonitorExpert Analysis System(Analytics/ Diagnostic)Analytic Models • Bubbling Temp. • Thermal Life • Moisture • PDM • DGA (e.g. TOAN) • Bushing • Coolingefficiency10Monitoring ArchitectureComprehensive Asset MonitoringAgenda•Why Asset Monitoring is Important on transformer example •Correlated analysis of monitored Parameters •Examples of Transformer monitored Parameters –DGA–UHF PD–Temperature–OLTC–Bushings•GIS PD monitoring Overview12Traditional Transformer MonitoringTraditional monitoring schemes may not show every piece of the puzzle that leads to asset healthVital pieces of information may be missed with traditional monitoring schemesAm I seeing a complete picture of asset health?Top Oil TempCurrent Winding Temp Tap Changer Position?13Key Parameters to Monitor•Pressure rises•Temperature swings (premature aging)•Liquid Level•DGA-gas formation and accumulation •Partial Discharge (PD)•Bushing Monitoring•LTC functionalityOnline monitoring of asset health may indicate early warning signs of potential issuesImportance of Online MonitoringCommon Transformer Failure ModesRupture of BladderCore Ground Current Cooler OperationBushingsPartial DischargeDC Neutral CurrentDGA Diagnostic ToolsDuval TriangleRogers RatiosMain transformer monitored parametersDGA Analytic ModelTOAN (Transformer Oil analysis and Notification)•Artificial Intelligence and Neural Network basedalgorithms, developed with Arizona Public Services•Indicate criticality of the gases generated inside the tankUHF PD for Transformers16UHF Sensors onTransformers•Sensors are to be fitted with maximum possible spacing between them to allow better triangulation of signal•Number of sensors depends on size of transformer (minimum of 3 needed for location, 4 to 6 preferred depending on complexity of internal parts, separate tap changers etc.)17FluorescenceGallium ArsenideDifferent Technologies, Different Times20。
