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Line Fault Detection

Non-operational IED Data. Condition-based CB Data. History of control circuit signals. Relay Settings Re-computation. Line Fault Detection. Bayesian approach to update distributions. Extract timings of signal parameters and fit probability distributions.

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Line Fault Detection

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  1. Non-operational IED Data Condition-based CB Data History of control circuit signals Relay Settings Re-computation Line Fault Detection Bayesian approach to update distributions Extract timings of signal parameters and fit probability distributions Circuit Breaker Reliability Monitoring Line Fault Detection Relay Settings Re-computation • Determine the affected relays due to switching operation and evaluate the risk of existing settings on the new system configuration. A decision will be taken whether to change settings or not. A fast algorithm based on Diakoptics N/W reduction calculates New settings. • Determine which transmission assets that are currently out of service due to a cascade switching are actually “healthy” and hence candidate to be placed back into service CB Performance Assessment Model Overview of Substation RATC Risk factor list Output Report Operational & Model Data Maintenance Needed ? Suitable for Switching? System Static Data, Current Topology, State Estimator O/P Lines to be switched From RATC algorithm Local Level Fault Detection, Classification & Location Identifying Affected Relays Substation-1 DFR, DPR Data Substation-2 DFR, DPR Data Risk Evaluation Un-faulted Lines Available for switching Update Line Availability, Location & Type of Fault Detects un-faulted Lines, switched due to cascade event. RATC can be triggered to mitigate cascade or Update Line availability Ensures Secure System Operation after RATC implementation by relay settings adjustment Facilitates reliable RATC Implementation Ensuring safe Breaker operation Resetting? NO YES CB Reliability Monitoring Relay Settings Re-computation Line Fault Detection CB Reliability Monitoring • Evaluate the operation states of each circuit breaker and give RATC whether the breaker is good for switching or not. Risk factors will be evaluated for each CB which will be used for maintenance decisions Model Static Power System YES Topology & Branch Data Update Topology DIAKOPTICS N/W reduction Fault Analysis Max/Min Loading Power Flow Synchronized Voltage and current measurements from both ends Compute Zone-2 Settings Compute Zone-3 Settings Settings OK? Current relay Settings Fault Detection & Classification Synchronized sampling Fault Location Zone-2 & 3 Update Command New Zone-2&3 Settings Final decision of fault? N Y Un-faulted line available for switching Repair faulted line • Project Team Member: • Industry Advisors: • PI: Mladen Kezunovic • (Texas A&M University) • Co-PI: Anjan Bose • (Washington State University) • Floyd Galvan (Entergy), Jim Gronquist (BPA), Jay Giri (ALSTOM Grid), Anthony Johnson (SCE), Innocent Kamwa (IREQ), Eugene Litvinov (ISO-NE), Naim Logic (SRP), Art Mander (TriState), David Meyer (CISCO), Mirrasoul Mousavi (ABB), Paul Myrda (EPRI), George Stefopoulos (NYPA), Michael Swider (NYISO), Janos Toth (BC Hydro), Shimo Wang (SCE)

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