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PGDTF Meeting Material | Geomagnetic Disturbance Task Force Update

Review the PGDTF Implementation Plan to meet NERC requirements, discuss GIC flow information, system voltage criteria, corrective actions, and more. Find answers to common questions about the GIC System Model.

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PGDTF Meeting Material | Geomagnetic Disturbance Task Force Update

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  1. Planning Geomagnetic Disturbance Task Force (PGDTF) Meeting Material December 9, 2016 Michael Juricek PGDTF Chairman 12/9/2016 PGDTF Meeting

  2. PDGTF Implementation Plan to Meet the Requirements of NERC TPL-007-1 • R5 • Determine GIC Flow Information to be used for the transformers thermal assessment • To be completed by • 07/01/2018 • Enforceable as of 01/01/2019 • R3 • Determine System Steady State Voltage Criteria for System Performance • Per Table 1. • To be completed by • 07/01/2019 • Enforceable as of 01/01/2022 • R7 • Corrective Action • Plan • To be completed by • 07/01/2019 • Enforceable as of • 01/01/2022 • R1 • Identify Individual and Joint Responsibilities • To be completed by 07/01/2017 • Enforceable as of 07/01/2017 • R2 • Develop System Models and GIC System Models • To be completed by 01/01/2018 • Enforceable as of 07/01/2018 • R6 • Perform Thermal Assessment for Transformers Experiencing ≥75 A GIC • To be completed by • 07/01/2019 • Enforceable as of 01/01/2021 • R4 • Complete GMD Vulnerability Assessment every 60 month • To be completed by • 07/01/2019 • Enforceable as of 01/01/2022 Michael Juricek – 12/9/2016 PGDTF Meeting

  3. Michael Juricek – 12/9/2016 PGDTF Meeting

  4. Schedule for Creating GIC System Model • 12/31/2016 – TSP Data for 345 kV System Based on 2021 Summer Peak Case Released on 10/15/2016 Due to ERCOT • 3/31/2017 – TSP Data for 138 kV and 69 kV Systems and RE Data Based on 2021 Summer Peak Case Released on 10/15/2016 and Update to 345 kV System Data Due to ERCOT • 6/1/2017 – ERCOT Provides First Pass of GIC System Model for Review to TSPs and REs • 7/1/2017 – TSPs and REs Provide Changes to GIC System Model to ERCOT • Subsequent Model Review Passes as Needed • 1/1/2018 – Complete 2021 Summer Peak and 2021 Minimum GIC System Models Using July 2017 SSWG 2021 Summer Peak and 2021 Minimum Base Cases Michael Juricek – 12/9/2016 PGDTF Meeting

  5. Questions Regarding GIC System Model • Q. How is the station dc grounding resistance (RG) determined if it has not been calculated or measured? • Q. What is the format for Station Latitude and Longitude in degrees? • A. The format is in decimal degrees, decimal minutes, instead of degrees, minutes and seconds, e.g., 32° 18’ 23.1“ N 122° 23’ 52.5” W = 32.30642, − 102.61458 YouTube discussion on conversion in Excel https://www.youtube.com/watch?v=S_nxWwtYfq4 • Q. How are underground lines modeled? • A. Specify branch induced voltages (INDVP and INDVQ) as 0.0. • Q. Should all buses in SSWG case be a GIC substation? • Q. What is winding grounding dc resistance (GRDRI)? Michael Juricek – 12/9/2016 PGDTF Meeting

  6. Questions Regarding GIC System Model • Q. What is format in PSS/E for Earth Model? • A. following is PSS/E’s format. Michael Juricek – 12/9/2016 PGDTF Meeting

  7. Questions Regarding GIC System Model • Q. Can PSS/E GIC manuals be shared with the PGDTF? • A. No. Only licensed users of PSS/E have access to the manuals. Michael Juricek – 12/9/2016 PGDTF Meeting

  8. Questions and Answers Michael Juricek – 12/9/2016 PGDTF Meeting

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