Event Analysis - 8 Lessons Learned posted 2021-06-03
Posted June 03, 2021
Events Analysis
Through participation in the ERO Event Analysis Program, NERC, Regions and the industry analyze events, identify the lessons to be learned, and conduct a formal cause code analysis. NERC has established an enhanced, industry wide Event Analysis Process (EAP) based on the recognition that many events, which occur on the bulk power system, can have varying levels of significance to the electric system and provide otherwise unrealized lessons to be learned and an opportunity for the trending of such events to identify possible reliability concerns.
The adoption by NERC of the Event Analysis Program brings clarity and certainty about what system events are relevant to analyze and to what level of detail, targeting potential risks to the reliability of the bulk power system for a more detailed and in-depth analysis.
NPCC staff works step-by-step with the registered entity throughout the total event analysis process, permitting the entity to assume the primary role in the development of the initial event analysis, lessons learned, which may benefit the industry, along with assisting and overseeing the standards sufficiency review and cause coding process for trending and reporting. NPCC staff, throughout the process, guides, supports and stands as an advocate of the registered entity as they continue to develop an improved culture of reliability and compliance.
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Lessons Learned
EMS/SCADA
Appropriate UPS design and implementation
Back Office EMS Support Tools Impact Real-Time Situational Awareness
Control Center Loss of SCADA Control and Monitoring Capability
EMS Recovery Strategy
External Model Data Causing State Estimator to Not Converge
Failover Configuration Leads to Loss of EMS
Firewall Failure After Time Limit Exceeded
ICCP Communication Failure Due to Firewall Patch Update
Indistinguishable Screens during Update = L/O Monitoring & Control
Lack of QOS (Quality of Service) on network devices providing priority traffic throughput
Line Frequency Excursion Causes UPS Shutdown and Control Center Evacuation
Loss of EMS Communications Due to Lack of Validation on RTU Configuration Parameter
Loss of ICCP due to Database Sizing Issue
Loss of ICCP-Local control Center Notifications
Loss of Monitoring and Control Capability due to Power Supply Failure
Loss of Monitoring Capabilities Due to FEP Hardware Malfunction
Loss of Monitoring Due to Authentication Software Update
Loss of SCADA Operating and Monitoring Ability
Loss of Substation Data Circuits to SCADA
Loss_of_Communication_to_Multiple_SCADA_RTUs_at_a_Switching_Center
Networking Packet Broadcast Storms
Real-Time Contingency Analysis Failure due to a Modeling Error
Risks Posed by Firewall Firmware Vulnerabilities
SCADA Failover Event
SCADA System Software Design Flaw Prevented Processing
SOL and IROL Monitoring Tool Leads to Unnecessary Manual Load Shedding
State Estimator Outages Requiring Tuning/Calibrating EMS Settings
Unavailability of the Transmission Stability Limits Calculation Application
Generation
Adequate Maintenance and Inspection of Generator Freeze Protection
Generator Distributed Control System Impact on Automatic Voltage Regulators
Sub-synchronous interaction between series compensated lines and generation
System Protection
Effects of Mutual Coupling when Setting Ground Instantaneous Overcurrent Elements
System Protection Review Prior to Disabling Protective Relays
Transmission
SOL & IROL Monitoring Tool Leads to Unnecessary Manual Load Shedding