FRCC - PROC - RC - EOP-004. FRCC Disturbance Reporting Procedure

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1 FRCC - PROC - RC - EOP-004 FRCC Disturbance Reporting Procedure Revisions Rev. No. Date Description Developed by: Approved by: 1 September 2, 2009 Conversion of RRO Legacy document FRCC Disturbance Reporting Procedure, to new format. FRCC Operating Reliability Subcommittee (ORS) FRCC Operating Committee (OC) May 2008 RRO Legacy document FRCC Disturbance Reporting Procedures FRCC Operating Reliability Subcommittee (ORS) FRCC Operating Committee (OC)

2 Page 2 of 13 A. Purpose: NERC Reliability Standard EOP states Disturbances or unusual occurrences that jeopardize the operation of the Bulk Electric System, or result in system equipment damage or customer interruptions, need to be studied and understood to minimize the likelihood of similar events in the future. B. Applicability: This procedure is applicable to FRCC entities registered as: FRCC Reliability Coordinator (RC) Balancing Authorities (BA) Transmission Operators (TOP) Generator Operators (GOP) Load Serving Entities (LSE) Regional Reliability Organization (RRO) Hereinafter, these registrants shall be referred to as ENTITY(IES) C. Procedure: Reporting requirements: Disturbance reporting requirements apply to those ENTITIES using the electric transmission system in the FRCC Region. Disturbance reports should be made in a timely manner in accordance with FRCC, FPSC, NERC and DOE reporting requirements. The Florida Public Service Commission (FPSC) adopted amendments to Rule , Florida Administrative Code, relating to Records of Interruptions and Commission Notification of Threats to Bulk Power Supply Integrity or Major Interruptions of Service. A copy of this rule and the reporting requirements can be found on the FRCC website. The FRCC Region and the ENTITY(IES) responsible for reporting disturbances will follow the requirements as listed in NERC Reliability Standard EOP-004. Preliminary Report In the process of analyzing Bulk Electric System disturbances on its system or facilities as specified in EOP R2, the ENTITY(IES) will provide a preliminary written report to the FRCC Region and to NERC. A copy of the preliminary report can be found in Appendix A. All preliminary reports are to be sent to disturbancereporting@frcc.com. The FRCC Chief Executive Officer (CEO) will review all preliminary reports to determine the nature and severity of the

3 Page 3 of 13 disturbance. The CEO will review determine if a final report is required. If no final report is required, the CEO shall notify the affected ENTITY(IES). Final Report If the disturbance has generated notable interest by the news media and/or warrants further review, notification will be made by the CEO to the chairs of the FRCC Operating Committee (OC) and FRCC Operating Reliability Subcommittee (ORS). Upon conclusion of the OC and/or ORS Chair that further review is needed, the ORS Chair will establish a FRCC Event Analysis Team (FEAT) to assist the affected ENTITY(IES) with the preparation of the final report. Members of the FEAT will include FRCC representatives on the NERC Operating Committee and NERC Disturbance Analysis Working Group, (or designees, in the event of a conflict of interest). The format for the final report can be found in Appendix B. The final report shall be subject to FRCC ORS and OC approval. Tracking The RRO shall track and review the status of all final report recommendations at least twice each year to ensure they are being acted upon in a timely manner as required by NERC Reliability Standard EOP-004 R4 and R5. Appendices: Appendix A: NERC Preliminary Report Form and can be found at ( Appendix B: FRCC Format for Final Report

4 FRCC PROC RC EOP -004 FRCC Disturbance Reporting Procedure Page 4 of 13 Appendix A Sample - Use the FRCC web link for most current version NERC Interconnection Reliability Operating Limit and Preliminary Disturbance Report Check here if this is an Interconnection Reliability Operating Limit (IROL) violation report. 1. Organization filing report. 2. Name of person filing report. 3. Telephone number. 4. Date and time of disturbance. Date:(mm/dd/yy) Time/Zone: 5. Did the disturbance originate in your system? Yes No 6. Describe disturbance including: cause, equipment damage, critical services interrupted, system separation, key scheduled and actual flows prior to disturbance and in the case of a disturbance involving a special protection or remedial action scheme, what action is being taken to prevent recurrence. 7. Generation tripped. MW Total 8. Frequency. List generation tripped Just prior to disturbance (Hz): Immediately after disturbance (Hz max.): Immediately after disturbance (Hz min.): 9. List transmission lines tripped (specify voltage level of each line). 10. Demand tripped (MW): Number of affected Customers: Demand lost (MW-Minutes): FIRM INTERRUPTIBLE

5 Page 5 of Restoration time. INITIAL FINAL Transmission: Generation: Demand:

6 FRCC PROC RC EOP -004 FRCC Disturbance Reporting Procedure Page 6 of 13 Appendix B FRCC FORMAT FOR FINAL DISTURBANCE REPORT Confidential and Proprietary Sample Cover Page: Brief Descriptive Title of the Disturbance Time of Disturbance Occurrence Date of Disturbance Occurrence Date of Report

7 FRCC PROC RC EOP -004 FRCC Disturbance Reporting Procedure Page 7 of 13 Sample Index Page: I N D E X Page No. I. Introduction... II. Conditions Prior to the Disturbance... a) System Generation... b) Generation and/or Transmission Out of Service... c) Inter-area Schedules/Actual Flows... d) Abnormal System Conditions... III. Description of the Disturbance... IV. Sequence of Events... V. Conclusions... VI. Recommendations... VII. Exhibits... VIII. Disturbance Evaluation Checklist...

8 FRCC PROC RC EOP -004 FRCC Disturbance Reporting Procedure Page 8 of 13 Sample Report Body: I. INTRODUCTION Provide a brief narrative which includes the following information: A. A brief description of the disturbance stating the time and date of its occurrence. B. Identify the systems and FEAT Members who prepared the subject report. C. Give the cause of the disturbance and impact on the interconnected system. 1. What was the cause, duration and magnitude of load which was lost? Provide the amount of firm load lost in MW Minutes and the amount of non-firm load lost in MW-Minutes. 2. How many customers were affected? 3. Briefly, what was the extent of transmission loss and/or islanding? 4. What significant frequency and/or voltage excursions occurred? 5. Give the time that system operation was returned to normal II. CONDITIONS PRIOR TO THE DISTURBANCE Provide the following information describing conditions which were in effect just prior to the disturbance (or at least one hour prior to the disturbance): A. System Generation - Give the on-line individual plant capability and scheduled output in the general area of the disturbance and in those areas which ultimately experienced a generation deficiency. The following format is suggested: Output Prior Generation To Disturbance (MW) Capability (MW) List each List individual List individual unit separately unit outputs unit capabilities B. Generation and/or Transmission Out of Service: Generation Out of Service List units out of service Capability (MW) List capability of each unit out of service Transmission Out of Service List each line, providing the names of the line terminals and the operating voltage level i.e., A to B 500 kv line; C to D 230 kv line, etc. C. Interchange Schedules/Actual Flows: List actual power flows on key transmission lines across the points of separation. If noteworthy, list voltages at key substations. The following format is recommended: Interchange Summary

9 Page 9 of 13 From To Scheduled Flow Actual Flow MW MW (Line (Line (Scheduled Flow (Actual Terminal C) Terminal D) if known) Flow) Voltage at Key Substations Substation (Substation A) Voltage (kv) (Voltage kv) D. Abnormal System Conditions Describe abnormal system conditions which may have contributed to the occurrence or impact of the disturbance. Describe abnormal system conditions which adversely impacted system restoration. III. DESCRIPTION OF THE DISTURBANCE Expand on the information provided in the introduction to provide a detailed description of the disturbance as follows: A. Describe the initiating event and the cause of the disturbance. B. Describe and give reasons for transmission outages and/or islanding which occurred as a result of the disturbance. C. Describe and give reasons for loss of generation. Give the magnitude of voltage and/or frequency excursions. The voltage and frequency information outlined below is desirable to assess system performance relative Transmission System Planning. It is not necessary that each and every bus matching the reporting criteria be listed; however, a representative set of buses illustrating the most extreme effects of the disturbance, on the member system experiencing the disturbance as well as other member systems, should be reported. 1. Where available, list the representative buses which experienced a transient voltage excursion exceeding xx% (Value to be determined by FEAT) of the predisturbance bus voltage magnitude. a. For each bus listed, provide the maximum voltage excursion (in %) relative to the pre-disturbance bus voltage magnitude. b. For each bus listed, provide the duration of the voltage excursion (in cycles) relative to the pre-disturbance bus voltage magnitude.

10 Page 10 of Where available, list the representative buses which experienced a frequency dip below --.- Hz with a _ cycle or longer duration. (Values to be determined by FEAT) a. For each bus listed, provide the magnitude of the frequency at the point of maximum dip (i.e Hz, 59.0 Hz, etc.). 3. Where available, list the representative buses having a voltage magnitude less than xx% (Value to be determined by FEAT) of the pre-disturbance voltage three minutes or more following the initial disturbance. Cite the voltage magnitude at the bus in kv and percent of pre-disturbance voltage. D. Describe and give reasons for loss of load. Provide details regarding magnitude and duration of load lost and number of customers affected. In addition, provide the amount of firm load lost in MW-Minutes and the amount of non-firm load lost in MW-Minutes. E. Assess the performance of under frequency load shedding programs. Identify locations where under frequency load shedding should have occurred but is either not installed or failed to operate as planned. Provide a list of all utilities within each island that experienced under frequency load shedding and tabulate the percent load shed by each utility on the basis of each utility's pre-disturbance load level. F. Describe system restoration and any significant problems which were encountered in returning the system to normal. Give the time that system operation was restored to normal. IV. SEQUENCE OF EVENTS Provide a chronological listing of the events which occurred beginning with the disturbance and ending with the system restored to normal. The following format is suggested: Sequence of Events Time (Define EST, EDT, etc.) List each time separately which corresponds to the event specified under the EVENT column. Event List each event separately which corresponds to the time specified under the TIME column. V. CONCLUSIONS List the conclusions which were formulated from the analysis of the disturbance. Include conclusions regarding operation in accordance with established operating criteria and standards. (FRCC, NERC, etc.) A specific conclusion as to the operator performance shall be made. VI. RECOMMENDATIONS

11 Page 11 of 13 List the recommendations which were formulated from the analysis of the disturbance. Include recommendations regarding operation in accordance with established operating criteria and standards. (FRCC, NERC, etc.) VII. VIII. EXHIBITS Provide interchange diagrams, system maps, frequency recording charts and other material as considered necessary in the evaluation of the disturbance. Please take steps to ensure that the exhibits are clearly legible for printing and readability. Label each exhibit separately. An index to the exhibits is to be included as the first page in the "Exhibits" section. DISTURBANCE EVALUATION CHECKLIST The completed checklist shall be attached to the disturbance report submitted to ORS for approval.

12 FRCC PROC RC EOP -004 FRCC Disturbance Reporting Procedure Page 12 of 13 DISTURBANCE EVALUATION CHECKLIST Category 1. Power System Facilities 2. Relaying Schemes 3. System Monitoring, Operating, Control & Communication Facilities 4. Operating Personnel Performance 5. Operational Planning 6. System Reserve & Generating Response 7. Preventative Maintenance Definition The existence of sufficient physical facilities to provide a reliable bulk power system. Detection of bulk power supply parameters that are outside normal operating limits and activation of protective devices to prevent or limit damage to the system. (UFLS/UVLS) Ability of dispatch and control facilities to monitor and control operation of the bulk power supply system. Adequacy of communication facilities to provide information within and between Entities. Ability of system personnel to react properly to unanticipated circumstances which require prompt decisive action. Study of near term operating conditions. Application of results to system operation. Ability of generation or load reduction equipment to maintain or restore system frequency and tie line flows to acceptable levels following a system disturbance. A program of routine inspections and tests to detect and correct potential equipment failures. 8. Restoration Orderly and effective procedures to quickly re-establish customer service and restore the bulk power supply system to a reliable condition 9. Special Protection Systems Use of relays to initiate controlled separation and generator tripping to prevent a widespread blackout. 10. System Planning Comprehensive planning work using appropriate planning criteria to provide a Contributing Factor In Causing the Disturbance, Significantly Increasing its Severity, or Hindering Timely Restoration? (YES/NO) Explanatory Comments

13 Page 13 of 13 Category Definition reliable bulk power supply system. Contributing Factor In Causing the Disturbance, Significantly Increasing its Severity, or Hindering Timely Restoration? (YES/NO) Explanatory Comments 11. Other Any other factor not listed above which was significant in causing the disturbance, making the disturbance more severe or adversely affecting restoration.

Lesson Learned Loss of Wind Turbines due to Transient Voltage Disturbances on the Bulk Transmission System

Lesson Learned Loss of Wind Turbines due to Transient Voltage Disturbances on the Bulk Transmission System Primary Interest Groups Balancing Authorities (BAs) Transmission Operators (TOPs) Generator Operators