20 Years and Counting: Deploying a System for Automated Analysis of Transmission Line Faults
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The document details the development and deployment of an automated fault analysis system at CenterPoint Energy over the past 20 years, emphasizing its historical evolution from magnetic tape recorders to modern intelligent electronic devices (IEDs). Key milestones include early prototypes, commercial deployment, and adaptations made in response to reliability issues and new requirements. The effectiveness of this system is illustrated through case studies of significant events, such as hurricanes, showcasing its role in enhancing data utilization and system restoration.
20 Years and Counting: Deploying a System for Automated Analysis of Transmission Line Faults
- 1. M . K E Z U N O V I C D . S E V C I K R . L U N S F O R D B . C L O W E T . P O P O V I C 2 0 1 4 G E O R G I A T E C H A N N U A L F A U L T & D I S T U R B A N C E A N A L Y S I S C O N F E R E N C E 20 Years and Counting: Deploying a System for Automated Analysis of Transmission Line Faults
- 2. CenterPoint Energy Gas and electric delivery company operating in several states. CenterPoint Energy Houston Electric (CEHE) is a structurally unbundled transmission and distribution utility serving Houston, Galveston, Freeport, Baytown, and surrounding communities in the state of Texas. CEHE does not own or operate power plants, nor does CEHE participate in competitive electric energy markets. CEHE (17 GW summer peak) has a small geographic footprint, but serves approximately 25% of the electric load in the ERCOT region. © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 3. Introduction Developing a system for automated fault and disturbance analysis at CenterPoint Energy Historical overview during last 20 years Designing and growing an automated system for fault data analysis Experiences during some major events © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 4. Background From magnetic tape fault recorders to modern IEDs and automated analysis Magnetic tape recorders prior 1980’s Introduction to digital fault recorders (DFRs) in 1985 All the DFRs have been updated (couple of generations) Implementing a system for fault analysis to improve data utilization © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 5. Developing a prototype Early 90s at Texas A&M University Proof of concept Signal processing and expert system rules Based on EMTP simulation and some field data © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 6. Field Trials Mid-90s Single substation Direct communication to a DFR Reporting results via fax © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 7. Commercial deployment Early 2000s Around 10 DFRs Slow deployment: reliability issues with installed PCs New DFRs introduced mixture of types and vintages © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 8. New requirements Improving the configuration management Better configuration management New generation of DFRs (combining types and vintages) Need for improved GUI Improved data management tools NERC requirements Considerations to include digital protective relays (DPRs) © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 9. First generation Fully deployed by mid-2000s Over 30 substations Web interface Email/pager reporting Need for improved GUI © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 10. Second generation Application server updated in 2013 Centralized client/server solution configured for ~ 100 IEDs © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 11. Data management tools within the GUI Quick data checks and improve the ability of users to filter and sift the data, enhancing the process of drilling down to the required data-set. Time-stamping the data upon arrival and processing by the automated fault analysis solution. Waveform preview window Processed vs Event date/time 1-End vs 2-End location © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 12. Encounters and testimonials Hurricane Rita in 2005 Sep 24, 2005, Hurricane Rita Damage to the system assessed almost exclusively from the reports produced by the solution © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 13. Encounters and testimonials Events in March 2006 Mar 28, 2006, major event in the 138 kV electrical system A total of 11 records by 3 different DFRs Multiple contingencies and delayed fault clearing The automated analysis provided quick snapshot overview of the 11 records and greatly reduced the time needed to identify and assess critical events. © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 14. Encounters and testimonials Hurricane Ike in 2008 90% customers lost power 99 transmission lines locked out © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 15. Encounters and testimonials Dry season in 2011 Late 2010 and early 2011 dry period Excessive buildup of contaminates on insulators and equipment © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference
- 16. Conclusions Time period of over 20 years Historical overview of the development and deployment The latest generation installed at CNP configured for ~100 IEDs, mainly DFRs Automated data collection and fault analysis have important role in system restoration Encounters and use illustrated with examples from major events such as hurricanes and dry season © 2014 Kezunovic, Sevcik, Lunsford, Clowe, Popovic; presented at 2014 Georgia Tech Fault and Disturbance Conference